TY - BOOK
TI - Next-Generation Internet Architectures and Protocols
A3 - Ramamurthy, Byrav
A3 - Rouskas, George N.
A3 - Sivalingam, Krishna Moorthy
AB - Book summary page views Book summary page views help Close Book summary page views help Book summary views reflect the number of visits to the book and chapter landing pages. Total views: 0 * Loading metrics...
DA - 2009///
PY - 2009///
DO - 10.1017/cbo9780511920950
OP -
PB - Cambridge University Press
SN - 9780511920950
UR - http://dx.doi.org/10.1017/cbo9780511920950
DB - Crossref
ER -
TY - JOUR
TI - Resource Co-Allocation for Large-Scale Distributed Environments
AU - Castillo, Claris
AU - Rouskas, George N.
AU - Harfoush, Khaled
AU - ACM
T2 - Hpdc'09: 18th Acm International Symposium on High Performance Distributed Computing
DA - 2009///
PY - 2009///
SP - 131-140
ER -
TY - JOUR
TI - Power Efficient Traffic Grooming in Optical WDM Networks
AU - Yetginer, Emre
AU - Rouskas, George N.
AU - Ulema, M
T2 - Globecom 2009 - 2009 Ieee Global Telecommunications Conference, Vols 1-8
DA - 2009///
PY - 2009///
SP - 1838-1843
ER -
TY - JOUR
TI - ERONs: Dynamic Lightpath Networking via Overlay Control of Static Optical Connections
AU - Karmous-Edwards, Gigi
AU - Vishwanath, Arun
AU - Reeves, Douglas
AU - Battestilli, Lina
AU - Vegesna, Priyanka
AU - Rouskas, George N.
AU - IEEE
T2 - Ondm: 2009 International Conference on Optical Network Design and Modeling
DA - 2009///
PY - 2009///
SP - 1-6
ER -
TY - JOUR
TI - Considerations for Sizing Buffers in Optical Packet Switched Networks
AU - Vishwanath, Arun
AU - Sivaraman, Vijay
AU - Rouskas, George N.
AU - IEEE
T2 - Ieee Infocom 2009 - Ieee Conference on Computer Communications, Vols 1-5
AB - Optical packet switches of the foreseeable future are expected to have severely limited buffering capability, since storage of optical signals remains a difficult and expensive operation. Our observations in simulation of TCP and real-time traffic in networks with such small buffers have revealed regions of anomalous performance in which losses for real-time traffic become higher as buffers get larger. The detrimental impact of larger optical buffers is studied in this paper and three new contributions are made. First, we develop a Markov chain model that allows analytical computation of loss. Our model validates observations from simulation, and opens the doors to an analytical understanding of how various factors affect the anomaly. Second, we study the anomaly under realistic traffic mixes containing persistent and non-persistent TCP flows, and show that the traffic mix does not significantly alter the anomaly. Third, we show that larger diversity in packet size between TCP and real-time traffic increases the severity of the anomaly, and is an important consideration when sizing optical switch buffers, particularly since real-time and TCP ACK packets are significantly smaller than the TCP data packets. Our study informs switch manufacturers and network operators of factors to consider when selecting optical buffer sizes in order to achieve desired performance balance between TCP and real-time traffic.
DA - 2009///
PY - 2009///
DO - 10.1109/INFCOM.2009.5062047
SP - 1323-1331
ER -
TY - JOUR
TI - An Economic Model for Pricing Tiered Network Services
AU - Lv, Qian
AU - Rouskas, George N.
AU - IEEE
T2 - 2009 Ieee International Conference on Communications, Vols 1-8
DA - 2009///
PY - 2009///
SP - 1470-1475
ER -
TY - JOUR
TI - A Unified Architecture for Cross Layer Design in the Future Optical Internet
AU - Baldine, I.
AU - Dutta, R.
AU - Rouskas, G.
AU - IEEE
T2 - 2009 35th European Conference on Optical Communication (Ecoc)
DA - 2009///
PY - 2009///
ER -
TY - CONF
TI - Dual Prices in Multi-Product Production Planning Models with Congested Resources
AU - Kefeli, A.
AU - Uzsoy, R.
AU - Fathi, Y.
AU - Kay, M.
T2 - INFORMS Computing Society Meeting
C2 - 2009/1//
CY - Charleston, SC
DA - 2009/1//
PY - 2009/1//
ER -
TY - CONF
TI - Comparison of Iterative Simulation-Optimization Algorithms for Production Planning of a Semiconductor Manufacturing Line
AU - Irdem, D.F.
AU - Kacar, N.B.
AU - Uzsoy, R.
T2 - INFORMS Computing Society Meeting
C2 - 2009/1//
CY - Charleston, SC
DA - 2009/1//
PY - 2009/1//
ER -
TY - SOUND
TI - Production Planning with Resources Subject to Congestion
AU - Uzsoy, R.
DA - 2009/2//
PY - 2009/2//
ER -
TY - JOUR
TI - Inventory control strategies in a recoverable system with state-dependent product returns
AU - Ahıska, S.Ş.
AU - King, R.E.
T2 - Journal of Management and Engineering Integration
DA - 2009///
PY - 2009///
VL - 2
IS - 1
SP - 1–8
ER -
TY - JOUR
TI - Bandwidth provisioning in ADSL access networks
AU - Xiong, Kaiqi
AU - Perros, Harry
AU - Blake, Steven
T2 - International Journal of Network Management
AB - Abstract We consider an ADSL access network consisting of subscribers, digital subscriber line access multiplexers (DSLAMs), metro Ethernet switches and a broadband remote access aggregation server (BRAS). We obtain expressions for dimensioning the access network in the upstream direction. Specifically, we show that the bandwidth required at each DSLAM, metro Ethernet switch, and BRAS can be expressed as an exponential function of the subscribers in a log scale when the number of subscribers does not surpass a certain value. After this value, it grows linearly as a function of the subscribers. Copyright © 2009 John Wiley & Sons, Ltd.
DA - 2009/9//
PY - 2009/9//
DO - 10.1002/nem.718
VL - 19
IS - 5
SP - 427-444
J2 - Int. J. Network Mgmt.
LA - en
OP -
SN - 1055-7148 1099-1190
UR - http://dx.doi.org/10.1002/nem.718
DB - Crossref
ER -
TY - JOUR
TI - Latticized Linear Optimization on the Unit Interval
AU - Li, Pingke
AU - Fang, Shu-Cherng
T2 - IEEE Transactions on Fuzzy Systems
AB - This paper considers the latticized linear optimization (LLO) problem and its variants, which are a special class of optimization problems constrained by fuzzy relational equations or inequalities. We show that an optimal solution to such a problem can be obtained in polynomial time as long as the objective function is a max-separable function with continuous monotone components. We further show that the set of all optimal solutions is fully determined by one maximum optimal solution and a finite number of minimal optimal solutions. The maximum optimal solution can be constructed in polynomial time once the optimal objective value is known, while the detection of all minimal optimal solutions in an efficient manner remains as a challenging problem. The relation between LLO and max-separable optimization and related issues are also investigated.
DA - 2009/12//
PY - 2009/12//
DO - 10.1109/tfuzz.2009.2031561
VL - 17
IS - 6
SP - 1353-1365
J2 - IEEE Trans. Fuzzy Syst.
OP -
SN - 1063-6706 1941-0034
UR - http://dx.doi.org/10.1109/tfuzz.2009.2031561
DB - Crossref
KW - Fuzzy optimization
KW - fuzzy relational equations
KW - max-separable optimization (MSO)
ER -
TY - JOUR
TI - Measuring and partitioning the high-order linkage disequilibrium by multiple order Markov chains
AU - Kim, Yunjung
AU - Feng, Sheng
AU - Zeng, Zhao-Bang
T2 - Genetic Epidemiology
AB - Genetic EpidemiologyVolume 33, Issue 2 p. 181-181 ErratumFree Access Measuring and partitioning the high-order linkage disequilibrium by multiple order Markov chains Yunjung Kim, Yunjung Kim Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina Department of Statistics, North Carolina State University, Raleigh, North Carolina Y. Kim and S. Feng contributed equally to this work.Search for more papers by this authorSheng Feng, Sheng Feng Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina Department of Statistics, North Carolina State University, Raleigh, North Carolina Y. Kim and S. Feng contributed equally to this work.Search for more papers by this authorZhao-Bang Zeng, Zhao-Bang Zeng Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina Department of Statistics, North Carolina State University, Raleigh, North Carolina Department of Genetics, North Carolina State University, Raleigh, North CarolinaSearch for more papers by this author Yunjung Kim, Yunjung Kim Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina Department of Statistics, North Carolina State University, Raleigh, North Carolina Y. Kim and S. Feng contributed equally to this work.Search for more papers by this authorSheng Feng, Sheng Feng Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina Department of Statistics, North Carolina State University, Raleigh, North Carolina Y. Kim and S. Feng contributed equally to this work.Search for more papers by this authorZhao-Bang Zeng, Zhao-Bang Zeng Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina Department of Statistics, North Carolina State University, Raleigh, North Carolina Department of Genetics, North Carolina State University, Raleigh, North CarolinaSearch for more papers by this author First published: 12 June 2008 https://doi.org/10.1002/gepi.20349 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume33, Issue2February 2009Pages 181-181 RelatedInformation
DA - 2009/2//
PY - 2009/2//
DO - 10.1002/gepi.20349
VL - 33
IS - 2
SP - 181-181
J2 - Genet. Epidemiol.
LA - en
OP -
SN - 0741-0395 1098-2272
UR - http://dx.doi.org/10.1002/gepi.20349
DB - Crossref
ER -
TY - JOUR
TI - Active robust fault detection of closed-loop systems: general cost case
AU - Ashari, A.E.
AU - Nikoukhah, R.
AU - Campbell, S.L.
T2 - IFAC Proceedings Volumes
AB - Active failure detection consists of finding an input signal (auxiliary signal) such that its use allows perfect detection of faults in a multi-model framework. In this paper we consider the problem of optimal auxiliary signal design for a linear uncertain system controlled by a linear feedback. The optimization criterion used is a worst case quadratic cost, which in practice is the same cost used for the design of the controller. Even though we suppose that the feedback controller is given, the methodology developed here should be useful for feedback design to achieve both control and fault detection objectives.
DA - 2009///
PY - 2009///
DO - 10.3182/20090630-4-ES-2003.00097
VL - 42
IS - 8
SP - 585–590
UR - https://doi.org/10.3182/20090630-4-ES-2003.00097
ER -
TY - CONF
TI - Two applications of Modeling and Simulation in the Design and Development of Navy Systems
AU - Drake, Kimberly J.
AU - Bradshaw, Kristen
AU - Violante, Patrick
AU - Campbell, S.L.
T2 - American Society of Naval Engineers (ASNE) Intelligent Ships Symposium VIII (ISSVIII) Proceedings
C2 - 2009/5/12/
CY - Philadelphia, PA
DA - 2009/5/12/
PY - 2009/5/12/
ER -
TY - CONF
TI - Robust Multi-Model Fault Detection and Control using an Active Closed-Loop Approach
AU - Ashari, A.E.
AU - Nikoukhah, R.
AU - Campbell, S.L.
T2 - 15th IFAC Symposium on System Identification - SYSID 2009
C2 - 2009///
C3 - Proceedings of the 15th IFAC Symposium on System Identification - SYSID 2009
CY - St. Malo, France
DA - 2009///
PY - 2009/7/6/
ER -
TY - JOUR
TI - An organizational entrepreneurship model of supply management integration and performance outcomes
AU - Handfield, R.
AU - Petersen, K.
AU - Cousins, P.
AU - Lawson, B.
T2 - International Journal of Operations and Production Management
AB - Purpose The role of supply managers in driving corporate performance is changing, with an increased emphasis on supply market intelligence, collaboration, inter‐organizational partnerships, and operational integration with supply partners. These traits are also mirrored in the research on entrepreneurial settings and firms. The purpose of this paper is to explore the parallels between supply management roles, and the entrepreneurial skill sets and mechanisms that have been identified in prior research. Design/methodology/approach A structural equation model, using a sample of 151 manufacturing and service firms based in the UK, tests this hypothesised model. Findings The theoretical framework was supported, with results indicating that entrepreneurial behaviours (supply market intelligence and supply management influence) contribute to integration within the firm and with suppliers, in order to drive performance improvement. Practical implications The results provide support for purchasing managers seeking to improve performance by changing the recruitment and culture of the supply management function toward an entrepreneurial orientation. Originality/value Although the application of organizational entrepreneurship thinking to supply management theory is nascent, this paper's results suggest that further research along these lines may provide a resilient platform for utilisation of entrepreneurial constructs to explain supply management principles in buyer‐supplier collaboration, relational capital, and organisational outcomes.
DA - 2009///
PY - 2009///
DO - 10.1108/01443570910932011
VL - 29
IS - 2
SP - 100-126
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-59349111646&partnerID=MN8TOARS
KW - Entrepreneurialism
KW - Supply chain management
KW - Supplier relations
ER -
TY - CONF
TI - Selecting Trustworthy Services: Learning a Bayesian Network
AU - Hang, Chung-Wei
AU - Singh, Munindar P.
T2 - Seventh International Conference on Autonomous Agents & Multi-Agent Systems
C2 - 2009///
C3 - Workshop on Trust in Agent Societies, Seventh International Conference on Autonomous Agents & Multi-Agent Systems
CY - Budapest, Hungary
DA - 2009///
PY - 2009/5/11/
PB - AAMAS
ER -
TY - JOUR
TI - HIV Model Analysis and Estimation Implementation Under Optimal Control Based Treatment Strategies
AU - David, J.
AU - Tran, H.
AU - Banks, H.T.
T2 - International Journal of Pure and Applied Mathematics
DA - 2009///
PY - 2009///
VL - 57
IS - 3
SP - 357–392
ER -
TY - BOOK
TI - Interface Problems and Methods in Biological and Physical Flows
AU - Khoo, Boo Cheong
AU - Li, Zhilin
AU - Lin, Ping
T2 - Lecture Notes Series (National University of Singapore, Institute for Mathematical Sciences)
A3 - Khoo, Boo Cheong
A3 - Li, Zhilin
A3 - Lin, Ping
AB - An Introduction to the Immersed Boundary and the Immersed Interface Methods Lecture Notes on Nonlinear Tumor Growth: Modeling and Simulation Progress in Modeling Pulsed Detonations Direct Numerical Simulations of Multiphase Flows.
DA - 2009/5//
PY - 2009/5//
DO - 10.1142/7147
M1 - 17
PB - World Scientific
SN - 9789812837844 9789812837851
UR - http://dx.doi.org/10.1142/7147
ER -
TY - JOUR
TI - Forecast updating and supplier coordination for complementary component purchases
AU - Thomas, D.J.
AU - Warsing, D.P.
AU - Zhang, X.
T2 - Production and Operations Management
AB - We study a supply chain where an original equipment manufacturer (OEM) buys subassemblies, comprised of two complementary sets of components, from a contract manufacturer (CM). The OEM provides a demand forecast at the time when the CM must order the long lead‐time set of components, but must decide whether or not to provide updated forecasts as a matter of practice. Forecast updates affect the CM's short lead‐time purchase decision, and the anticipation of updates may also affect the long lead‐time purchase decision. While the OEM and CM both incur lost sales costs, the OEM can decide whether or not to share the overage costs otherwise fully borne by the CM. We investigate when the OEM is better served by committing to provide updated forecasts and/or committing to share overage costs. For a distribution‐free, two‐stage forecast‐update model, we show that (1) the practice of providing forecast updates may be harmful to the OEM and (2) at the OEM's optimal levels of overage risk sharing, the CM undersupplies relative to the supply chain optimal quantity. For a specific forecast‐update model, we computationally investigate conditions under which forecast updating and risk sharing are in the best interest of the OEM.
DA - 2009///
PY - 2009///
DO - 10.1111/j.1937-5956.2009.01012.x
VL - 18
IS - 2
SP - 167-184
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-67549088044&partnerID=MN8TOARS
KW - supply contracts
KW - forecast updating
KW - production outsourcing
ER -
TY - JOUR
TI - A survey on fuzzy relational equations, part I: classification and solvability
AU - Li, Pingke
AU - Fang, Shu-Cherng
T2 - Fuzzy Optimization and Decision Making
DA - 2009/3/28/
PY - 2009/3/28/
DO - 10.1007/S10700-009-9059-0
VL - 8
IS - 2
SP - 179-229
J2 - Fuzzy Optim Decis Making
LA - en
OP -
SN - 1568-4539 1573-2908
UR - http://dx.doi.org/10.1007/S10700-009-9059-0
DB - Crossref
KW - Fuzzy relational equation
KW - Solvability
KW - Duality
KW - Adjointness
KW - Triangular norm
ER -
TY - JOUR
TI - An Experimental Study of the Performance Impact of Path-Based DoS Attacks in Wireless Mesh Networks
AU - Agarwal, Avesh K.
AU - Wang, Wenye
T2 - Mobile Networks and Applications
DA - 2009/8/28/
PY - 2009/8/28/
DO - 10.1007/s11036-009-0204-3
VL - 15
IS - 5
SP - 693-709
J2 - Mobile Netw Appl
LA - en
OP -
SN - 1383-469X 1572-8153
UR - http://dx.doi.org/10.1007/s11036-009-0204-3
DB - Crossref
KW - performance evaluation
KW - wireless mesh
KW - denial of service
KW - implementation
ER -
TY - JOUR
TI - Heuristics for capacity planning problems with congestion
AU - Kim, Sukgon
AU - Uzsoy, Reha
T2 - Computers & Operations Research
AB - Motivated by a problem in the semiconductor industry, we develop improved formulations for the problem of planning capacity acquisition and deletion over time when resources are subject to congestion, motivated by a problem in the semiconductor industry. We use nonlinear clearing functions to relate the expected output of a production resource in a planning period to the expected work in process (WIP) inventory level. Exploiting the properties of the clearing function allows us to formulate the single workcenter problem as a shortest path problem. This forms the basis for two greedy constructive heuristics and a Lagrangian heuristic for the multistage problem. The latter procedure also provides lower bounds on the optimal value. We present computational experiments showing that the proposed heuristics obtain high-quality solutions in modest CPU times.
DA - 2009/6//
PY - 2009/6//
DO - 10.1016/j.cor.2008.06.006
VL - 36
IS - 6
SP - 1924-1934
J2 - Computers & Operations Research
LA - en
OP -
SN - 0305-0548
UR - http://dx.doi.org/10.1016/j.cor.2008.06.006
DB - Crossref
KW - Capacity expansion
KW - Queueing
KW - Clearing functions
KW - Lagrangian relaxation
KW - Heuristics
ER -
TY - JOUR
TI - Production planning with resources subject to congestion
AU - Asmundsson, Jakob
AU - Rardin, Ronald L.
AU - Turkseven, Can Hulusi
AU - Uzsoy, Reha
T2 - Naval Research Logistics
AB - Abstract A fundamental difficulty in developing effective production planning models has been accurately reflecting the nonlinear dependency between workload and lead times. We develop a mathematical programming model for production planning in multiproduct, single stage systems that captures the nonlinear dependency between workload and lead times. We then use outer linearization of this nonlinear model to obtain a linear programming formulation and extend it to multistage systems. Extensive computational experiments validate the approach and compare its results to conventional models that assume workload‐independent planning lead times. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009
DA - 2009/3//
PY - 2009/3//
DO - 10.1002/nav.20335
VL - 56
IS - 2
SP - 142-157
J2 - Naval Research Logistics
LA - en
OP -
SN - 0894-069X 1520-6750
UR - http://dx.doi.org/10.1002/nav.20335
DB - Crossref
KW - production planning
KW - clearing functions
KW - mathematical programming
KW - congestion
ER -
TY - CHAP
TI - Approximate Rewriting of Queries Using Views
AU - Afrati, Foto
AU - Chandrachud, Manik
AU - Chirkova, Rada
AU - Mitra, Prasenjit
T2 - Advances in Databases and Information Systems
AB - We study approximate, that is contained and containing, rewritings of queries using views. We consider conjunctive queries with arithmetic comparisons (CQACs), which capture the full expressive power of SQL select-project-join queries. For contained rewritings, we present a sound and complete algorithm for constructing, for CQAC queries and views, a maximally-contained rewriting (MCR) whose all CQAC disjuncts have up to a predetermined number of view literals. For containing rewritings, we present a sound and efficient algorithm pruned-MiCR, which computes a CQAC containing rewriting that does not contain any other CQAC containing rewriting (i.e., computes a minimally containing rewriting, MiCR) and that has the minimum possible number of relational subgoals. As a result, the MiCR rewriting produced by our algorithm may be very efficient to execute. Both algorithms have good scalability and perform well in many practical cases, due to their extensive pruning of the search space, see [1].
PY - 2009///
DO - 10.1007/978-3-642-03973-7_13
SP - 164-178
OP -
PB - Springer Berlin Heidelberg
SN - 9783642039720 9783642039737
UR - http://dx.doi.org/10.1007/978-3-642-03973-7_13
DB - Crossref
ER -
TY - CONF
TI - Characterizing Reactive Contaminant Sources in a Water Distribution System
AU - Kumar, Jitendra
AU - Brill, E. Downey
AU - Mahinthakumar, G
AU - Ranjithan, Ranji
T2 - World Environmental and Water Resources Congress 2009
AB - Accurate knowledge of the characteristics of the contamination source during a contamination event is necessary for development of any mitigation and control strategy. Contaminant injected in a system is most likely to be reactive with chlorine; however, it is impractical for water quality monitoring systems to be able to monitor for the presence of all possible contaminants. In any distribution system, chlorine levels and other water quality parameters (pH, conductance, etc.) are routinely monitored to maintain the prescribed disinfection capacity. Any reactive contaminant would affect the chlorine levels resulting in deviations in the expected chlorine levels from those expected under normal operating conditions. Anomalies in the chlorine concentration from that of the expected value can be used as a surrogate to characterize the contaminant source in the system. In the absence of knowing the reactive characteristics of the contaminants, the location of injection, and injection pattern, source identification becomes a difficult problem to solve. Source identification can be posed as an inverse problem. In earlier work authors investigated the effect of the order of reaction kinetics of the contaminant with chlorine and its impact on source identification problem assuming the reaction kinetics to be known. That work is extended to investigate a methodology to address the source identification problem based on chlorine measurements, and the effects of different uncertain contamination conditions. Findings from a range of scenarios will be presented and discussed.
C2 - 2009/5/12/
C3 - World Environmental and Water Resources Congress 2009
DA - 2009/5/12/
DO - 10.1061/41036(342)65
PB - American Society of Civil Engineers
SN - 9780784410363
UR - http://dx.doi.org/10.1061/41036(342)65
DB - Crossref
ER -
TY - CONF
TI - A Hybrid Heuristic Search Approach for Contaminant Source Characterization
AU - Liu, Li
AU - Brill, E. Downey
AU - Mahinthakumar, G. (Kumar)
AU - Ranjithan, S. Ranji
T2 - World Environmental and Water Resources Congress 2009
AB - The rapid discovery of the contaminant source and its mass loading characteristics in a water distribution system (WDS) is vital for generating an efficient control strategy during a contamination event. Previous work on the Adaptive Dynamic Optimization Technique (ADOPT), which was developed as an Evolution Strategy (ES) based procedure, presents an approach to estimate the source characteristics adaptively, given dynamically updated observation data. Although this simulation-optimization approach is promising, it is computationally expensive, which poses challenges in the context of real-time solutions. This paper reports the findings of an investigation that builds upon the prior work by introducing a hybrid heuristic search method for the real-time characterization of a contaminant source. This new method integrates the ES-based ADOPT with a logistic regression (LR) analysis and a local improvement method to expedite the convergence and possibly solve the problem quickly. As a prescreening technique, a LR analysis step is performed prior to ADOPT; this step reduces the search space by eliminating unnecessary source nodes as potential source locations. Then, a local search (LS) approach is embedded into some of the algorithmic steps in ADOPT to serve as a postscreening step that potentially speeds up the convergence in localized regions in the solution space. Numerical experiments for the proposed hybrid approach are performed on an example water distribution network, and the results are compared with those of the standard implementation of ADOPT.
C2 - 2009/5/12/
C3 - World Environmental and Water Resources Congress 2009
DA - 2009/5/12/
DO - 10.1061/41036(342)63
PB - American Society of Civil Engineers
SN - 9780784410363
UR - http://dx.doi.org/10.1061/41036(342)63
DB - Crossref
ER -
TY - CHAP
TI - Systematic Exploration of Efficient Query Plans for Automated Database Restructuring
AU - Kormilitsin, Maxim
AU - Chirkova, Rada
AU - Fathi, Yahya
AU - Stallmann, Matthias
T2 - Advances in Databases and Information Systems
AB - We consider the problem of selecting views and indexes that minimize the evaluation costs of the important queries under an upper bound on the disk space available for storing the views/indexes selected to be materialized. We propose a novel end-to-end approach that focuses on systematic exploration of plans for evaluating the queries. Specifically, we propose a framework (architecture) and algorithms that enable selection of views/indexes that contribute to the most efficient plans for the input queries, subject to the space bound. We present strong optimality guarantees on our architecture. Our algorithms search for sets of competitive plans for queries expressed in the language of conjunctive queries with arithmetic comparisons. This language captures the full expressive power of SQL select-project-join queries, which are common in practical database systems. Our experimental results demonstrate the competitiveness and scalability of our approach.
PY - 2009///
DO - 10.1007/978-3-642-03973-7_11
SP - 133-148
OP -
PB - Springer Berlin Heidelberg
SN - 9783642039720 9783642039737
UR - http://dx.doi.org/10.1007/978-3-642-03973-7_11
DB - Crossref
ER -
TY - JOUR
TI - Investigating the role of student motivation in computer science education through one-on-one tutoring
AU - Boyer, Kristy Elizabeth
AU - Phillips, Robert
AU - Wallis, Michael D.
AU - Vouk, Mladen A.
AU - Lester, James C.
T2 - Computer Science Education
AB - The majority of computer science education research to date has focused on purely cognitive student outcomes. Understanding the motivational states experienced by students may enhance our understanding of the computer science learning process, and may reveal important instructional interventions that could benefit student engagement and retention. This article investigates issues of student motivation as they arise during one-on-one human tutoring in introductory computer science. The findings suggest that the choices made during instructional discourse are associated with cognitive and motivational outcomes, and that particular strategies can be leveraged based on an understanding of the student motivational state.
DA - 2009/6//
PY - 2009/6//
DO - 10.1080/08993400902937584
VL - 19
IS - 2
SP - 111-135
J2 - Computer Science Education
LA - en
OP -
SN - 0899-3408 1744-5175
UR - http://dx.doi.org/10.1080/08993400902937584
DB - Crossref
KW - motivation
KW - tutoring
KW - confidence
KW - CS1
KW - introductory programming
KW - initiative
ER -
TY - CHAP
TI - Tracking Files in the Kepler Provenance Framework
AU - Mouallem, Pierre
AU - Barreto, Roselyne
AU - Klasky, Scott
AU - Podhorszki, Norbert
AU - Vouk, Mladen
T2 - Lecture Notes in Computer Science
PY - 2009///
DO - 10.1007/978-3-642-02279-1_21
SP - 273-282
OP -
PB - Springer Berlin Heidelberg
SN - 9783642022784 9783642022791
UR - http://dx.doi.org/10.1007/978-3-642-02279-1_21
DB - Crossref
ER -
TY - JOUR
TI - Problems and techniques
AU - Ipsen, I.
T2 - SIAM Review
DA - 2009///
PY - 2009///
VL - 51
IS - 1
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-59749092679&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Problems and Techniques
AU - Ipsen, Ilse
T2 - SIAM Review
AB - Evaluating and improving the performance of scientific software—this is the topic of the six-author paper “Optimization and Performance Modeling of Stencil Computations on Modern Multiprocessors.” Performance can degrade substantially when data are too large to fit in cache, so that data that do not fit in cache may have to be retrieved from main memory. Since memory traffic is slow compared to computation speed, processors become idle while waiting for data to arrive. The software in question is a code for the numerical solution by finite difference methods of the heat equation in three dimensions. The finite difference method is referred to as a “stencil computation” because each point in this three-dimensional grid requires information from a certain set of neighboring points (the stencil) to perform its computations. The code is evaluated on three different microprocessors: Itanium2, AMD Opteron, and IBM Power5; and also on the STI Cell processor. The authors evaluate strategies for managing memory hierarchies; and they examine issues such as cache blocking, cache-aware and cache-oblivious algorithms, local-store management, and hardware and software prefetching. The paper illustrates well the difficulty of this undertaking, and the interaction among the numerous hardware features and software strategies that affect the performance even of computations with simple and predictable memory access patterns.
DA - 2009/2/5/
PY - 2009/2/5/
DO - 10.1137/siread000051000001000127000001
VL - 51
IS - 1
SP - 127-127
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-68649123647&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Problems and Techniques
AU - Ipsen, Ilse
T2 - SIAM Review
AB - This issue features two papers involving optimization problems, one targeted at minimizing temperature differences across a plate, and the other at multidimensional integration. 1. Want to turn the graphics card in your laptop or desktop into a personal supercomputer? Eddie Wadbro and Martin Berggren show you how, in their paper “Megapixel Topology Optimization on a Graphics Processing Unit.” The advantage of graphics cards is that they are cheap, relatively speaking, and that they allocate more resources to data processing than a CPU would. Graphics cards are also becoming easier to program (especially for those of us who grew up with Connection Machines and FPS-164s). Graphics processing units are natural hardware platforms for problems that are highly data parallel. This includes the topology optimization problem considered here, where a limited amount of high-conductivity material is to be distributed across a heated plate so that its temperature field is as even as possible. The authors express this as an area-to-point flow optimization problem. A subsequent finite element discretization gives a symmetric positive-definite linear system that is solved by a diagonally preconditioned conjugate gradient method. As it turns out, the optimal distribution of the high-conductivity material emanates like a root from the heat sink, with increasing girth and finer branches as the discretization is refined. 2. In their paper “Approximate Volume and Integration for Basic Semialgebraic Sets,” Didier Henrion, Jean Bernard Lasserre, and Carlo Savorgnan are concerned with deterministic techniques for difficult multidimensional integration, of the type where only brute force Monte Carlo methods have a chance at producing acceptable approximations. The bodies can be disconnected or nonconvex, and are described by sets of polynomial inequalities (i.e., semialgebraic sets). The foundation for this work was laid more than a hundred years ago, when Chebyshev, Markov, and Stieltjes showed how to approximate one-dimensional integrals by sequences of moments. In this paper, the authors formulate the multidimensional integration as an infinite-dimensional linear programming problem, and approximate the required moments by a hierarchy of semidefinite programming problems. Numerical examples illustrate that the approach produces accurate approximations in two and three dimensions.
DA - 2009/11/4/
PY - 2009/11/4/
DO - 10.1137/siread000051000004000705000001
VL - 51
IS - 4
SP - 705-705
ER -
TY - CONF
TI - Modeling cerebral blood flow and regulation
AU - Aoi, M.
AU - Gremaud, P.
AU - Tran, H.T.
AU - Novak, V.
AU - Olufsen, M.S.
T2 - 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society
AB - Cerebral autoregulation is a homeostatic mechanism which maintains blood flow despite changes in blood pressure in order to meet local metabolic demands. Several mechanisms play a role in cerebral autoregulation in order to adjust vascular tone and caliber of the cerebral vessels, but the exact etiology of the dynamics of these mechanism is not well understood. In this study, we discuss two patient specific models predicting cerebral blood flow velocity during postural change from sitting to standing. One model characterises cerebral autoregulation, the other describes the beat-to-beat distribution of blood flow to the major regions of the brain. Both models have been validated against experimental data from a healthy young subject.
C2 - 2009/9//
C3 - 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society
DA - 2009/9//
DO - 10.1109/IEMBS.2009.5334057
PB - IEEE
UR - http://dx.doi.org/10.1109/IEMBS.2009.5334057
DB - Crossref
ER -
TY - JOUR
TI - Active incipient fault detection with two simultaneous faults
AU - Fair, Martene
AU - Campbell, Stephen L.
T2 - IFAC Proceedings Volumes
AB - The problem of detecting small parameter variations in linear uncertain systems due to incipient faults, by injecting an input signal to enhance detection is considered. Unlike previous work where it is usually assumed that there is only one fault, in this paper we allow for two faults which is a natural assumption in the incipient case. A constructive method for the construction of an optimal input signal for achieving guaranteed detection with specified precision is presented in the discrete model case. The method is an extension of the multi-model approach used for the construction of auxiliary signals for failure detection, however, new technical issues must be addressed.
DA - 2009///
PY - 2009///
DO - 10.3182/20090630-4-es-2003.00095
VL - 42
IS - 8
SP - 573-578
J2 - IFAC Proceedings Volumes
LA - en
OP -
SN - 1474-6670
UR - http://dx.doi.org/10.3182/20090630-4-es-2003.00095
DB - Crossref
ER -
TY - CONF
TI - Modeling Viscoelastic Wall Properties of Ovine Arteries
AU - Valdez-Jasso, Daniela
AU - Haider, Mansoor A.
AU - Campbell, Stephen L.
AU - Bia, Daniel
AU - Zocalo, Yanina
AU - Armentano, Ricardo L.
AU - Olufsen, Mette S.
T2 - ASME 2009 Summer Bioengineering Conference
AB - Generation of a complete map of arterial wall mechanical properties can improve treatment of cardiovascular diseases via contributions to design of patient specific vascular substitutes used to alleviate atherosclerosis and stenoses, which are predominant in arterial pathways (i.e., abdominal aorta, carotids, or femoral arteries). Clinically useful estimation of arterial properties from patient data requires both efficient algorithms and models that are both complex enough to capture clinically important properties and simple enough to allow rapid computation. In this study, we used mechanical models accounting for both elastic and viscoelastic wall deformation to analyze how vessel properties and associated model parameters vary with artery type. It is known that for the aorta wall, deformation is dominated by nonlinear elastic dynamics, while for the smaller vessels (e.g. the carotid artery) deformation is dominated by viscoelastic responses. The latter is correlated with composition of the vessels; the aorta contains significantly less smooth muscle cells (∼40%) than the carotid artery (∼60%), and has significantly more elastin (see Fig 1).
C2 - 2009/6/17/
C3 - ASME 2009 Summer Bioengineering Conference, Parts A and B
DA - 2009/6/17/
DO - 10.1115/sbc2009-205640
PB - ASME
SN - 9780791848913
UR - http://dx.doi.org/10.1115/sbc2009-205640
DB - Crossref
ER -
TY - JOUR
TI - Feedback in Active Fault Detection
AU - Ashari, Alireza Esna
AU - Nikoukhah, Ramine
AU - Campbell, Stephen L.
T2 - IFAC Proceedings Volumes
AB - In recent years there has been increased interest in the use of active approaches toward fault detection. In one of these approaches a test signal is designed such that over a short period it will reveal a fault not otherwise detectable and do so with as little perturbation of system performance as possible. Feedback plays an important role in control but its role in active fault detection based on test signals has not been explored. This paper begins that investigation.
DA - 2009///
PY - 2009///
DO - 10.3182/20090706-3-fr-2004.00032
VL - 42
IS - 10
SP - 192-196
J2 - IFAC Proceedings Volumes
LA - en
OP -
SN - 1474-6670
UR - http://dx.doi.org/10.3182/20090706-3-fr-2004.00032
DB - Crossref
ER -
TY - JOUR
TI - Integrating Marine Observatories into a System-of-Systems: Messaging in the US Ocean Observatories Initiative
T2 - OCEANS - ANCHORAGE
DA - 2009///
PY - 2009///
UR - https://publons.com/publon/21294453/
ER -
TY - CONF
TI - Multiagent Commitment Alignment
AU - Chopra, Amit K.
AU - Singh, Munindar P.
C2 - 2009/5//
C3 - Proceedings of the 8th International Conference on Autonomous Agents and MultiAgent Systems (AAMAS)
DA - 2009/5//
VL - 1
SP - 937–944
PB - IFAAMAS
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84899835693&partnerID=MN8TOARS
ER -
TY - CONF
TI - Koko: Engineering affective applications
AU - Sollenberger, D.J.
AU - Singh, M.P.
C2 - 2009///
C3 - Proceedings of the International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS
DA - 2009///
VL - 2
SP - 1451-1452
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84899794043&partnerID=MN8TOARS
ER -
TY - CONF
TI - Koko: Architecture and methodology for engineering social affective applications
AU - Sollenberger, D.J.
AU - Singh, M.P.
C2 - 2009///
C3 - Proceedings of the International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS
DA - 2009///
VL - 2
SP - 1174-1175
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84899796109&partnerID=MN8TOARS
ER -
TY - CONF
TI - Formal aspects of classifying and selecting business services
AU - Udupi, Y.B.
AU - Singh, M.P.
C2 - 2009///
C3 - Proceedings of the International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS
DA - 2009///
VL - 2
SP - 1296-1297
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84899889033&partnerID=MN8TOARS
ER -
TY - CONF
TI - Operators for Propagating Trust and their Evaluation in Social Networks
AU - Hang, Chung-Wei
AU - Wang, Yonghong
AU - Singh, Munindar P.
C2 - 2009/5//
C3 - Proceedings of the 8th International Conference on Autonomous Agents and MultiAgent Systems (AAMAS)
DA - 2009/5//
VL - 2
SP - 1025–1032
PB - IFAAMAS
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84896062976&partnerID=MN8TOARS
ER -
TY - BOOK
TI - Modelling interactions via commitments and expectations
AU - Torroni, P.
AU - Yolum, P.
AU - Singh, M.P.
AU - Alberti, M.
AU - Chesani, F.
AU - Gavanelli, M.
AU - Lamma, E.
AU - Mello, P.
AB - Organizational models often rely on two assumptions: openness and heterogeneity. This is, for instance, the case with organizations consisting of individuals whose behaviour is unpredictable, whose internal structure is unknown, and who do not necessarily share common goals, desires, or intentions. This fact has motivated the adoption of social-based approaches to modelling interaction in organizational models. The idea of social semantics is to abstract away from the agent internals and provide a social meaning to agent message exchanges. In this chapter, we present and discuss two declarative, social semantic approaches for modelling interaction. The first one takes a state-oriented perspective, and models interaction in terms of commitments. The second one adopts a rule-oriented perspective, and models interaction in terms of logical formulae expressing expectations about agent interaction. We use a simple interaction protocol taken from the e-commerce domain to present the functioning and features of the commitment- and expectation-based approaches, and to discuss various forms of reasoning and verification that they accommodate, and how organizational modelling can benefit from them.
DA - 2009///
PY - 2009///
DO - 10.4018/978-1-60566-256-5.ch011
SE - 263-284
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84901566756&partnerID=MN8TOARS
ER -
TY - CONF
TI - Integrating marine observatories into a system-of-systems: Messaging in the US ocean observatories initiative
AU - Arrott, M.
AU - Chave, A.D.
AU - Farcas, C.
AU - Farcas, E.
AU - Kleinert, J.E.
AU - Krueger, I.
AU - Meisinger, M.
AU - Orcutt, J.A.
AU - Peach, C.
AU - Schofield, O.
AU - Singh, M.P.
AU - Vernon, F.L.
C2 - 2009///
C3 - MTS/IEEE Biloxi - Marine Technology for Our Future: Global and Local Challenges, OCEANS 2009
DA - 2009///
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-77951528644&partnerID=MN8TOARS
ER -
TY - BOOK
TI - Enhancing tropos with commitments a business metamodel and methodology
AU - Telang, P.R.
AU - Singh, M.P.
AB - This paper motivates a novel metamodel and methodology for specifying cross-organizational business interactions that is based on Tropos. Current approaches for business modeling are either high-level and semiformal or formal but low-level. Thus they fail to support flexible but rigorous modeling and enactment of business processes. This paper begins from the well-known Tropos approach and enhances it with commitments. It proposes a natural metamodel based on commitments and a methodology for specifying a business model. This paper includes an insurance industry case study that several researchers have previously used.
DA - 2009///
PY - 2009///
DO - 10.1007/978-3-642-02463-4_22
VL - 5600 LNCS
SE - 417-435
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-69049091007&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Enhancing Tropos with Commitments A Business Metamodel and Methodology
T2 - Lecture Notes in Computer Science
DA - 2009///
PY - 2009///
UR - https://publons.com/publon/21294448/
ER -
TY - CONF
TI - Choice, interoperability, and conformance in interaction protocols and service choreographies
AU - Baldoni, M.
AU - Desai, N.
AU - Baroglio, C.
AU - Patti, V.
AU - Chopra, A.K.
AU - Singh, M.P.
C2 - 2009///
C3 - Proceedings of the International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS
DA - 2009///
VL - 1
SP - 608-615
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84899803605&partnerID=MN8TOARS
ER -
TY - BOOK
TI - Architecture for affective social games
AU - Sollenberger, D.J.
AU - Singh, M.P.
AB - The importance of affect in delivering engaging experiences in entertainment and education is well recognized. We introduce the Koko architecture, which describes a service-oriented middleware that reduces the burden of incorporating affect into games and other entertainment applications. Koko provides a representation for affect, thereby enabling developers to concentrate on the functional and creative aspects of their applications. The Koko architecture makes three key contributions: (1) improving developer productivity by creating a reusable and extensible environment; (2) yielding an enhanced user experience by enabling independently developed applications to collaborate and provide a more coherent user experience than currently possible; (3) enabling affective communication in multiplayer and social games.
DA - 2009///
PY - 2009///
DO - 10.1007/978-3-642-11198-3_6
VL - 5920 LNAI
SE - 79-94
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-72449207958&partnerID=MN8TOARS
ER -
TY - BOOK
TI - Business modeling via commitments
AU - Telang, P.R.
AU - Singh, M.P.
AB - Existing computer science approaches to business modeling offer low-level abstractions such as data and control flows, which fail to capture the business intent underlying the interactions that are central to real-life business models. In contrast, existing management science approaches are high-level but not only are these semiformal, they are also focused exclusively on managerial concerns such as valuations and profitability.
This paper proposes a novel business metamodel based on commitments that considers additional agent-oriented concepts, specifically, goals and tasks. It proposes a set of business patterns and algorithms for checking model completeness and verification of agent interactions. Unlike traditional models, our approach marries rigor and flexibility, providing a crisp notion of correctness and compliance independent of specific executions.
DA - 2009///
PY - 2009///
DO - 10.1007/978-3-642-10739-9_9
VL - 5907 LNCS
SE - 111-125
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-71549122896&partnerID=MN8TOARS
ER -
TY - CONF
TI - Systematic exploration of efficient query plans for automated database restructuring
AU - Kormilitsin, Maxim
AU - Chirkova, Rada
AU - Fathi, Yahya
AU - Stallmann, Matthias
T2 - Springer, Berlin, Heidelberg
C2 - 2009///
C3 - East European Conference on Advances in Databases and Information Systems
DA - 2009///
SP - 133-148
ER -
TY - JOUR
TI - Computational design of asymmetric electron beam devices
AU - Ives, R. L.
AU - Attarian, A.
AU - Bui, T.
AU - Read, M.
AU - David, J.
AU - Tran, Hien
AU - Tallis, W. J.
AU - Davis, S.
AU - Gadson, S. E.
AU - Blach, N.
AU - Brown, John
AU - Kiley, E.
T2 - IEEE Transactions on Electron Devices
AB - Three-dimensional design codes are allowing the development of more complex electron beam devices with significant performance improvements over axially symmetric devices. Distributed beam RF devices, including multiple-beam and sheet-beam designs, allow significant reduction in operating voltage with improved efficiency and bandwidth. The increased parameter space, however, makes the design process extremely complicated and costly. This paper describes optimization techniques to automate the most time-consuming tasks of the design, which is searching the available parameter space to optimize performance. Both sheet-beam and multiple-beam designs are considered.
DA - 2009///
PY - 2009///
DO - 10.1109/TED.2009.2015421
VL - 56
IS - 5
SP - 753–761
KW - Computer optimization
KW - electron beam
KW - electron gun
KW - multiple beam
KW - RF sources
KW - sheet beam
ER -
TY - JOUR
TI - Combining Trust-Region Techniques and {R}osenbrock Methods for Gradient Systems
AU - Luo, X-L
AU - Kelley, C T
AU - Liao, L-Z.
AU - Tam, H-W
T2 - J. Optim. Theory Appl.
DA - 2009///
PY - 2009///
VL - 140
SP - 265-286
ER -
TY - CONF
TI - Calibration of Ground Water Models with {POD}
AU - Kelley, C T
AU - Winton, C
AU - Eslinger, O J
AU - Pettway, J
A2 - Heinkenschloss, M
A2 - Hoppe, R H W
A2 - Schultz, V
C2 - 2009///
C3 - Numerical Techniques for Optimization Problems with PDE constraints
DA - 2009///
SP - 47-49
ER -
TY - JOUR
TI - Special issue on accurate solution of eigenvalue problems
AU - Ipsen, I.C.F.
T2 - SIAM Journal on Matrix Analysis and Applications
DA - 2009///
PY - 2009///
VL - 31
IS - 1
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-73649094469&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Problems and Techniques
AU - Ipsen, Ilse
T2 - SIAM Review
AB - Halftoning and manifold learning are the two subjects of this issue. Halftoning will help you to understand better what goes on inside your printer, in particular how your printer converts continuous images to pixels. Manifold learning has the potential to become an important approach for machine learning, specifically for the automated analysis of large high-dimensional data sets. 1. Manifold learning is a form of dimension reduction, where one assumes that data lie on a low-dimensional manifold within a high-dimensional space. Applications of manifold learning include object recognition, computer vision, speech analysis, and molecular dynamics simulations. Hongyuan Zha and Zhenyue Zhang, the authors of the paper “Spectral Properties of the Alignment Matrices in Manifold Learning,” focus on a particular class of local manifold learning methods known as local tangent space alignment (LTSA). LTSA computes representations for local neighborhoods of a manifold, and then combines, or aligns, all the local representations into one global representation for the whole manifold. This involves the computation of eigenspaces and null spaces of alignment matrices. The accuracy of LTSA is affected by the amount of overlap among local neighborhoods, as well as by perturbations from noise and computational errors. Armed with tools from matrix and graph theory the authors determine the impact of overlap under ideal conditions, when computations are free of errors, and they determine the accuracy of the null spaces when the alignment matrices are subjected to perturbations. 2. Black ink printers convert grayscale images into images made up of binary pixels in such a way that the human eye perceives almost no difference between the binary and the grayscale image. This conversion process is called “halftoning.” It works because the human eye has the ability to perform spatial smoothing. In contrast, an artificial vision system with a sufficiently fine resolution perceives a binary halftone image as merely a chaotic mess of pixels. In his paper “Least-Squares Halftoning via Human Vision System and Markov Gradient Descent (LS-MGD): Algorithm and Analysis,” Jianhong (Jackie) Shen models the human vision system as a point spread function that is weakly lowpass and quantifies its spatial smoothing ability. He presents a halftoning algorithm based on a randomized gradient descent approach that minimizes the difference between the perceived binary and continuous images in the least squares sense. Numerical experiments with test images give a good feel for the performance of the algorithm.
DA - 2009/8/6/
PY - 2009/8/6/
DO - 10.1137/siread000051000003000543000001
VL - 51
IS - 3
SP - 543-543
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-59749092679&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Problems and Techniques
AU - Ipsen, Ilse
T2 - SIAM Review
AB - The two papers in this issue share a common concern: smoothing. In the first paper, it is time series that are being smoothed, and in the second paper it is multigrid methods that do the smoothing for PDE-constrained optimization problems. In biology, medicine, finance, economics, geophysics, and social sciences one frequently needs to discern “trends” in data sets. Mathematically, this problem is known as filtering, smoothing, or time series analysis, and many different methods have been devised, including moving average filters, bandpass filters, and smoothing splines. For a given set of scalars $y_t$, one wants to find another set of scalars $x_t$ that vary smoothly, but that are close to the original set. The new points $x_t$ are considered to represent the underlying trend. The question now is, how do we define what it means to “vary smoothly”? Seung-Jean Kim, Kwangmoo Koh, Stephen Boyd, and Dimitry Gorinevsky answer this question in the one-norm. In their paper “$\ell_1$ Trend Filtering,” they minimize an expression containing a one-norm, so that the resulting $x_t$ are points of a piecewise linear function. The minimization is formulated as a convex quadratic program and solved by an interior point method. This paper should be of interest to many readers, because of its connections to $\ell_1$ regularization in geophysics, signal processing, statistics, and sparse approximation. In their paper “Multigrid Methods for PDE Optimization,” Alfio Borzì and Volker Schulz review multigrid methods for solving infinite-dimensional optimization problems whose constraints are expressed in terms of partial differential equations (PDEs). Such optimization problem arise in optimal control, shape design, and shape optimization. Multigrid methods, very informally, solve PDEs by discretizing them iteratively on a hierarchy of grids, so as to capture all frequencies. So-called smoothers are responsible for high frequencies, while lower frequencies are resolved on coarser grids. This paper is essentially self-contained. It starts by introducing terminology for PDE-constrained optimization problems and reviewing multigrid methods. Subsequent discussions focus on multigrid SQP, Schur-complement-based multigrid smoothers, and collective smoothing multigrid, as well as applications to optimal control problems governed by hyperbolic, elliptic, and parabolic PDEs.
DA - 2009/5//
PY - 2009/5//
DO - 10.1137/siread000051000002000337000001
VL - 51
IS - 2
SP - 337-337
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-68649123647&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Preface to the 14th ILAS Conference Proceedings Shanghai 2007
T2 - Linear Algebra and Its Applications
DA - 2009///
PY - 2009///
DO - 10.1016/j.laa.2008.10.002
VL - 430
IS - 5-6
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-58349086314&partnerID=MN8TOARS
ER -
TY - JOUR
TI - AUXILIARY SIGNAL DESIGN FOR FAULT DETECTION IN NONLINEAR SYSTEMS
AU - Sweetingham, K.A.
AU - Campbella, S.L.
T2 - Control and Intelligent Systems
AB - Recently, there has been considerable research on active fault detection and model identification algorithms for linear systems. These algorithms compute an auxiliary input signal which guarantees fault detection, assuming a bounded noise. This paper begins to address the issue of applying the previously developed linear theory to nonlinear systems. To exploit the known linear theory, linearizations are used and bounds are computed to find the allowable noise for the nonlinear system. We also present an example of an oscillating pendulum to verify the bounds computed.
DA - 2009///
PY - 2009///
DO - 10.2316/journal.201.2009.3.201-2049
VL - 37
IS - 3
J2 -
LA - en
OP -
SN - 1925-5810
UR - http://dx.doi.org/10.2316/journal.201.2009.3.201-2049
DB - Crossref
ER -
TY - CHAP
TI - Numerical Techniques for Simulation, Parameter Estimation, and Noise Control in Structural Acoustic Systems
AU - Banks, H. T.
AU - Smith, R. C.
T2 - Dynamics and Control of Distributed Systems
A2 - Tzou, H. S.
A2 - Bergman, L. A.
AB - A model for a 3-D structural acoustic system, currently being used for parameter estimation and control experiments in the Acoustics Division, NASA Langley Research Center, is presented. This system consists of a hard-walled cylinder with a flexible circular plate at one end. An exterior noise source causes vibrations in the plate which in turn lead to unwanted noise inside the cylinder. Control is implemented through the excitation of piezoceramic patches bonded to the plate which generate in-plane forces and/or bending moments in response to an input voltage.
PY - 2009/12/22/
DO - 10.1017/cbo9780511530180.006
SP - 202-263
OP -
PB - Cambridge University Press
SN - 9780511530180
UR - http://dx.doi.org/10.1017/cbo9780511530180.006
DB - Crossref
ER -
TY - RPRT
TI - Raleigh Durham Airport Wildlife Hazard Assessment
AU - Roise, J.P.
AU - Browne, M.
AU - Hertl, P.
AU - Berner, A.
A3 - Approved by FAA, study commissioned by RDU
DA - 2009///
PY - 2009///
PB - Approved by FAA, study commissioned by RDU
ER -
TY - JOUR
TI - Design for Six Sigma: Design and Development of an Equine Composite Flooring System
AU - Wood, Jesse William
DA - 2009///
PY - 2009///
ER -
TY - CONF
TI - Computing across curricula: The view of industry leaders
AU - Wiebe, Eric
AU - Ho, Chia-Lin
AU - Raubenheimer, Dianne
AU - Bullard, Lisa
AU - Joines, Jeff
AU - Miller, Carolyn
AU - Rouskas, George
T2 - American Society for Engineering Education
C2 - 2009///
C3 - American Society for Engineering Education
DA - 2009///
ER -
TY - JOUR
TI - Applying Linear Regression and Neural Network Meta-Models for Evolutionary Algorithm Based Simulation Optimization
AU - Propst, Michael David
DA - 2009///
PY - 2009///
ER -
TY - CONF
TI - AC 2009-676: COMPUTING ACROSS CURRICULA: THE VIEW OF INDUSTRY LEADERS
AU - Wiebe, Eric
AU - others
C2 - 2009///
C3 - ASEE
DA - 2009///
VL - 14
SP - 1
ER -
TY - CONF
TI - AC 2009-209: USING COMPUTATIONAL TOOLS TO ENHANCE PROBLEM SOLVING
AU - Raubenheimer, Dianne
AU - Joines, Jeff
AU - Craig, Amy
C2 - 2009///
C3 - ASEE
DA - 2009///
VL - 14
SP - 1
ER -
TY - BLOG
TI - Simulation and Lean Six Sigma: Part 3 Defining Lean and Simulation, Success in Simulation
AU - Joines, J.A.
T2 - simio.biz
DA - 2009/1/9/
PY - 2009/1/9/
UR - http://simio.biz/blog/2009/02/05/six-sigma-and-simulation-part-3/
ER -
TY - CONF
TI - Using Computational Tools to Enhance Problem Solving
AU - Craig, A.
AU - Joines, J.A.
AU - Raubenheimer, D.
T2 - American Society for Engineering Education International Conference
C2 - 2009///
C3 - American Society for Engineering Education
DA - 2009///
UR - http://soa.asee.org/paper/conference/paper-view.cfm?id=10163
ER -
TY - JOUR
TI - Integration of Computer Based Problem Solving Into Engineering Curricula
AU - Brent, R.
AU - Craig, A.
AU - Joines, J.
AU - Raubenheimer, D.
T2 - Computers in Engineering Education Journal
DA - 2009///
PY - 2009///
VL - 19
IS - Jan-March
ER -
TY - BOOK
TI - Computer simulation techniques: the definitive introduction!
AU - Perros, Harry G.
DA - 2009///
PY - 2009///
PB - Raleigh, NC: Harry Perros.
ER -
TY - JOUR
TI - SecureMR: A Service Integrity Assurance Framework for Map Reduce
AU - Wei, Wei
AU - Du, Juan
AU - Yu, Ting
AU - Gu, Xiaohui
T2 - 25TH ANNUAL COMPUTER SECURITY APPLICATIONS CONFERENCE
AB - MapReduce has become increasingly popular as a powerful parallel data processing model. To deploy MapReduce as a data processing service over open systems such as service oriented architecture, cloud computing, and volunteer computing, we must provide necessary security mechanisms to protect the integrity of MapReduce data processing services. In this paper, we present SecureMR, a practical service integrity assurance framework for MapReduce. SecureMR consists of five security components, which provide a set of practical security mechanisms that not only ensure MapReduce service integrity as well as to prevent replay and denial of service (DoS) attacks, but also preserve the simplicity, applicability and scalability of MapReduce. We have implemented a prototype of SecureMR based on Hadoop, an open source MapReduce implementation. Our analytical study and experimental results show that SecureMR can ensure data processing service integrity while imposing low performance overhead.
DA - 2009///
PY - 2009///
DO - 10.1109/acsac.2009.17
SP - 73-82
ER -
TY - JOUR
TI - FIRST: Combining forward iterative selection and shrinkage in high dimensional sparse linear regression
AU - Hwang, W. Y.
AU - Zhang, H. H.
AU - Ghosal, S.
T2 - Statistics and its Interface
AB - We propose a new class of variable selection techniques for regression in high dimensional linear models based on a forward selection version of the LASSO, adaptive LASSO or elastic net, respectively to be called as forward iterative regression and shrinkage technique (FIRST), adaptive FIRST and elastic FIRST. These methods seem to work effectively for extremely sparse high dimensional linear models. We exploit the fact that the LASSO, adaptive LASSO and elastic net have closed form solutions when the predictor is onedimensional. The explicit formula is then repeatedly used in an iterative fashion to build the model until convergence occurs. By carefully considering the relationship between estimators at successive stages, we develop fast algorithms to compute our estimators. The performance of our new estimators are compared with commonly used estimators in terms of predictive accuracy and errors in variable selection. AMS 2000 subject classifications: Primary 62J05, 62J05; secondary 62J07.
DA - 2009///
PY - 2009///
DO - 10.4310/sii.2009.v2.n3.a7
VL - 2
IS - 3
SP - 341-348
ER -
TY - CONF
TI - Machine system for harvesting small diameter woody biomass and reducing hazardous fuels: A developmental report
AU - Roise, Joseph
AU - Hannum, L. C.
AU - Catts, G. P.
AB - This is a report on field testing and refinement of the first generation FECON Bio-Harvester, designed to swath harvest small diameter woody biomass of mixed species and size classes. The machine system consisted of a unique harvesting head, a FECON FTX440, a silage dump wagon and roll-on-roll-off bins. The cutting system consists of a rotating drum with cutting tools, followed by an auger and a material fan which blew the harvested biomass into the silage dump wagon. The harvesting head is PTO driven. The machine system was tests in natural forest understory, between rows of pine plantations and in a Pocosin ecosystem. The sites had 6 to 20 green tons per acre of small diameter woody biomass. Below are the resulting harvesting productivity and cost.
C2 - 2009///
C3 - 2009 Bioenergy Engineering Conference
DA - 2009///
DO - 10.13031/2013.28860
ER -
TY - JOUR
TI - elm Optimal resource allocation in stochastic activity networks via the electromagnetism approach: a platform implementation in Java
AU - Tereso, A. P.
AU - Novais, R. A.
AU - Araujo, M. M. T.
AU - Elmaghraby, S. E.
T2 - Control and Cybernetics
DA - 2009///
PY - 2009///
VL - 38
IS - 3
SP - 745-782
ER -
TY - CONF
TI - Architecture for affective social games
AU - Sollenberger, D. J.
AU - Singh, M. P.
C2 - 2009///
C3 - Agents for games and simulations: trends in techniques, concepts and design
DA - 2009///
VL - 5920
SP - 79-94
ER -
TY - BOOK
TI - Mathematical and experimental modeling of physical and biological processes
AU - Banks, H. T.
AU - Tran, H. T.
DA - 2009///
PY - 2009///
PB - Boca Raton : CRC Press
SN - 9781420073379
ER -
TY - BOOK
TI - Interface problems and methods in biological and physical flows
A3 - B. C. Khoo, Z. Li
A3 - Lin, P.
DA - 2009///
PY - 2009///
PB - New Jersey: World Scientific
SN - 9789812837844
ER -
TY - BOOK
TI - Advancing the Frontiers of Simulation: A festschrift in honor of George Samuel Fishman
AU - Alexopoulos, C.
AU - Goldsman, D.
AU - Wilson, J. R.
A3 - Alexopoulos, C.
A3 - Goldsman, D.
A3 - Wilson, J. R.
DA - 2009///
PY - 2009///
PB - New York: Springer Verlag
SN - 9781441908162
ER -
TY - JOUR
TI - Active incipient fault detection with more than two simultaneous faults
AU - Fair, Martene
AU - Campbell, Stephen L.
T2 - 2009 IEEE INTERNATIONAL CONFERENCE ON SYSTEMS, MAN AND CYBERNETICS (SMC 2009), VOLS 1-9
AB - The problem of detecting small parameter variations in linear uncertain systems due to incipient faults, with the possibility of injecting an input signal to enhance detection, is considered. Most studies assume that there is only one fault developing. Recently an active approach for two simultaneous faults has been introduced. In this paper we extend this approach to allow for more than two simultaneous faults. Having more than two simultaneous incipient faults is sometimes a natural assumption. A computational method for the construction of an input signal for achieving guaranteed detection with specified precision is presented for discrete time systems. The method is an extension of a multi-model approach used for the construction of auxiliary signals for failure detection, however, new technical issues must be addressed. A case study is examined.
DA - 2009///
PY - 2009///
DO - 10.1109/icsmc.2009.5346202
SP - 3322-3327
SN - 1062-922X
KW - Failure detection
KW - linear system
KW - detection systems
KW - feedback
KW - optimal detection
ER -
TY - BOOK
TI - Generalized Inverses of Linear Transformations
AU - Campbell, Stephen L.
AU - Meyer, Carl D.
AB - Preface to the Classics edition Preface Introduction and other preliminaries 1. The Moore-Penrose or generalized inverse 2. Least squares solutions 3. Sums, partitioned matrices and the constrained generalized inverse 4. Partial isometries and EP matrices 5. The generalized inverse in electrical engineering 6. (i, j, k)-Generalized inverses and linear estimation 7. The Drazin inverse 8. Applications of the Drazin inverse to the theory of finite Markov chains 9. Applications of the Drazin inverse 10. Continuity of the generalized inverse 11. Linear programming 12. Computational concerns Bibliography Index.
DA - 2009///
PY - 2009///
DO - 10.1137/1.9780898719048
VL - 56
PB - Society for Industrial and Applied Mathematics
SE - 1-272
SN - 978-0-898716-71-9
ER -
TY - CONF
TI - Business modeling via commitments
AU - Telang, P. R.
AU - Singh, M. P.
C2 - 2009///
C3 - Service-oriented computing: agents, semantics, and engineering, proceedings
DA - 2009///
VL - 5907
SP - 111-125
ER -
TY - JOUR
TI - FISTE: A Black Box Approach for End-to-End QoS Management
AU - Feng, Benjamin Zhong Ming
AU - Huang, Changcheng
AU - Devetsikiotis, Michael
T2 - ACM TRANSACTIONS ON MODELING AND COMPUTER SIMULATION
AB - The goal of traffic engineering is to achieve a target Quality of Service (QoS) while maximizing network utilization. While determining the QoS for end-to-end paths in a network under self-similar traffic models is difficult, end-to-end network performance analysis is still essential in providing QoS to networks such as Virtual Private Networks (VPN) and Peer-to-Peer (P2P) networks. The Fast Importance Sampling based Traffic Engineering (FISTE) approach proposed in this article is a prediction-based approach that maps the ingress traffic levels of a network to the QoS of end-to-end path(s) in the network. Because FISTE is a hybrid of simulation analysis and closed-form analysis, it can treat a complex network as a black box. When we combined Simulated Annealing (SA) with FISTE, the resulting approach can provide a traffic engineering solution so that multiple end-to-end QoS requirements are satisfied while the network resource utilization is maximized. FISTE originated from the concept of Importance Sampling (IS), and our approach differs from the previous Importance Sampling based approaches since this is the first time that IS is applied to multi-queue systems under Fractional Gaussian Noise (FGN) input and traffic engineering.
DA - 2009/10//
PY - 2009/10//
DO - 10.1145/1596519.1596521
VL - 19
IS - 4
SP -
SN - 1558-1195
KW - Overlay network
KW - importance Sampling
KW - response surface
KW - traffic engineering
KW - self-similar
KW - fractal gaussian noise
KW - congestion
KW - latency
KW - packet loss
KW - buffer overflow
KW - Monte Carlo
KW - end-to-end QoS
KW - simulated annealing
KW - peer-to-peer
KW - virtual private network
KW - prediction
KW - heuristic search
ER -
TY - JOUR
TI - Completions of nonlinear DAE flows based on index reduction techniques and their stabilization
AU - Campbell, Stephen L.
AU - Kunkel, Peter
T2 - JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
AB - Differential algebraic equations (DAEs) define a differential equation on a manifold. A number of ways have been developed to numerically solve some classes of DAEs. Motivated by problems in control theory, numerical simulation, and the use of general purpose modeling environments, recent research has considered the embedding of the DAE solutions of a general DAE into the solutions of an ODE where the added dynamics have special properties. This paper both provides new results on the linear time-varying case and considers the important nonlinear case.
DA - 2009/12/15/
PY - 2009/12/15/
DO - 10.1016/j.cam.2009.08.111
VL - 233
IS - 4
SP - 1021-1034
SN - 1879-1778
KW - Differential algebraic equations
KW - Numerical methods
KW - Stability
ER -
TY - JOUR
TI - An integrated production planning model with load-dependent lead-times and safety stocks
AU - Orcun, Seza
AU - Uzsoy, Reha
AU - Kempf, Karl G.
T2 - COMPUTERS & CHEMICAL ENGINEERING
AB - The divergence over the years of research paradigms addressing the production planning problem has led to the development of an extensive set of techniques, each of which can address a particular aspect of the practical problem and none of which provides a complete solution. In particular, most approaches fail to address the circular, non-linear dependency between resource utilization, lead-times and safety stocks. We present a non-linear programming formulation of the integrated problem using clearing functions that determines a work release schedule guaranteeing a specified service level in the face of stochastic demand. We introduce an iterative heuristic solution procedure that solves a relaxed LP approximation of the original NLP at each iteration to determine the lead-time profile to set safety-stock levels. Computational experiments suggest that our proposed iterative procedure performs well relative to conventional LP models that assume fixed, workload-independent lead-times.
DA - 2009/12/10/
PY - 2009/12/10/
DO - 10.1016/j.compchemeng.2009.07.010
VL - 33
IS - 12
SP - 2159-2163
SN - 0098-1354
KW - Capacity planning
KW - Clearing function
KW - Safety stock
KW - Load-dependent lead-times
KW - Linear programming
ER -
TY - JOUR
TI - A Survey on Next Generation Mobile WiMAX Networks: Objectives, Features and Technical Challenges
AU - Papapanagiotou, Ioannis
AU - Toumpakaris, Dimitris
AU - Lee, Jungwon
AU - Devetsikiotis, Michael
T2 - IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
AB - In order to meet the requirements of 4G mobile networks targeted by the cellular layer of IMT-advanced, next generation mobile WiMAX devices based on IEEE 802.16m will incorporate sophisticated signal processing, seamless handover functionalities between heterogeneous technologies and advanced mobility mechanisms. This survey provides a description of key projected features of the physical (PHY) and medium access control (MAC) layers of 802.16m, as a major candidate for providing aggregate rates at the range of Gbps to high-speed mobile users. Moreover, a new unified method for simulation modeling, namely the evaluation methodology (EVM), introduced in 802.16m, is also presented.
DA - 2009///
PY - 2009///
DO - 10.1109/SURV.2009.090402
VL - 11
IS - 4
SP - 3-18
SN - 1553-877X
KW - IEEE 802.16m
KW - Mobile WiMAX Networks
KW - Next Generation Wireless Networks
KW - Broadband Wireless Access
KW - Evaluation Methodology
ER -
TY - JOUR
TI - Commitment-Based Service-Oriented Architecture
AU - Singh, Munindar P.
AU - Chopra, Amit K.
AU - Desai, Nirmit
T2 - COMPUTER
AB - Existing service-oriented architectures are formulated in terms of low-level abstractions far removed from business services. In a new SOA, the components are business services and the connectors are patterns, modeled as commitments, that support key elements of service engagements.
DA - 2009/11//
PY - 2009/11//
DO - 10.1109/MC.2009.347
VL - 42
IS - 11
SP - 72-79
SN - 0018-9162
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-70350222918&partnerID=MN8TOARS
ER -
TY - CONF
TI - A Robust fault tolerant control approach for LTI systems with actuator and sensor faults
AU - Cai, X. J.
AU - Wu, F.
AB - In this paper, we study a robust fault-tolerant control (FTC) problem for linear systems with time varying actuator and sensor faults and propose an parameter-dependent solution by using L 2 gain optimization techniques. Using estimated faults from a fault detection and isolation (FDI) scheme, parameter-dependent robust FTC gain will be scheduled by fault magnitude to stabilize and optimize the faulty system under all possible fault scenarios. The synthesis condition of such a FTC control law will be formulated as linear matrix inequalities (LMIs) and can be solved efficiently by semi-definite programming techniques. A numerical example is used to demonstrate the proposed fault-tolerant control approach for a simple faulty systems with different fault levels and fault estimation error bounds.
C2 - 2009///
C3 - CCDC 2009: 21st Chinese Control and Decision Conference, vols 1-6, Proceedings
DA - 2009///
DO - 10.1109/ccdc.2009.5191903
SP - 890-895
ER -
TY - JOUR
TI - On Bandwidth Tiered Service
AU - Rouskas, George N.
AU - Baradwaj, Nikhil
T2 - IEEE-ACM TRANSACTIONS ON NETWORKING
AB - Many network operators offer some type of tiered service, in which users may select only from a small set of service levels (tiers). Such a service has the potential to simplify a wide range of core network functions, allowing the providers to scale their operations efficiently. In this work, we study a number of problem variants related to service tier selection. Our contributions include: (1) a faster algorithm for obtaining optimal service tiers; (2) a new formulation and optimal algorithm to optimize jointly the number and magnitude of each service tier; and (3) the concept of ??TDM emulation?? in which all service tiers are multiples of the same (software-configurable) bandwidth unit, and a suite of algorithms to select jointly the basic unit and service tiers. Our work provides a systematic framework for reasoning about and tackling algorithmically the general problem of service tier selection, and has applications to a number of networking contexts, including access networks (e.g., determining the tiers for ADSL, cable modem networks or PONs) and core networks (e.g., LSP sizing for MPLS networks).
DA - 2009/12//
PY - 2009/12//
DO - 10.1109/TNET.2009.2017928
VL - 17
IS - 6
SP - 1780-1793
SN - 1063-6692
KW - Directional p-median
KW - dynamic programming
KW - optimization
KW - Tiered service
ER -
TY - JOUR
TI - Estimating LTL rates using publicly available empirical data
AU - Kay, Michael G.
AU - Warsing, Donald P.
T2 - INTERNATIONAL JOURNAL OF LOGISTICS-RESEARCH AND APPLICATIONS
AB - We develop a shipper-oriented model to estimate less-than-truckload (LTL) truck rates for transporting goods between origin–destination (O–D) pairs located anywhere in the continental United States. The rate estimate is developed from internet-accessible tariff tables and allows straightforward computation of optimal shipment sizes (minimising total logistics costs) and comparison with the total cost of other modes. The model uses publicly available nominal rates along with a characterisation of the distribution of LTL shipments, based on other publicly available data, to determine a rate that also accounts for the estimated industry average discount from the nominal rate. We use nonlinear regression to build the estimate, with tariff-based rates serving as the dependent variable and load density, shipment weight, and O–D pair distance as the explanatory variables. The model is normalised to reflect average industry rates and current economic conditions using the Producer Price Index for LTL service. Although our results are specific to US markets for truck freight, the method of analysis serves as a model for similar international studies.
DA - 2009///
PY - 2009///
DO - 10.1080/13675560802392415
VL - 12
IS - 3
SP - 165-193
SN - 1469-848X
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-67650902017&partnerID=MN8TOARS
KW - freight transportation
KW - tariff rates
KW - less-than-truckload
KW - nonlinear regression
ER -
TY - CONF
TI - Bayesian nonparametric approach to multiple testing
AU - Ghosal, S.
AU - Roy, A.
C2 - 2009///
C3 - Perspectives in mathematical sciences i: probability and statistics
DA - 2009///
VL - 7
SP - 139-164
ER -
TY - CONF
TI - An empirical study of security problem reports in Linux distributions
AU - Anbalagan, P.
AU - Vouk, M.
C2 - 2009///
C3 - International symposium on empirical software engineering and
DA - 2009///
SP - 482-485
ER -
TY - JOUR
TI - The credit risk(+) model with general sector correlations
AU - Deshpande, Amogh
AU - Iyer, Srikanth K.
T2 - CENTRAL EUROPEAN JOURNAL OF OPERATIONS RESEARCH
DA - 2009/6//
PY - 2009/6//
DO - 10.1007/s10100-009-0084-4
VL - 17
IS - 2
SP - 219-228
SN - 1613-9178
KW - Credit risk(+)
KW - Compound gamma distribution
KW - Value at risk
KW - Risk contribution
KW - Correlation
KW - Portfolio loss distribution
KW - Moment generating function
ER -
TY - JOUR
TI - Pseudo-transient continuation for nonlinear transient elasticity
AU - Gee, Michael W.
AU - Kelley, C. T.
AU - Lehoucq, R. B.
T2 - INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
AB - Abstract This paper demonstrates how pseudo‐transient continuation improves the efficiency and robustness of a Newton iteration within a non‐linear transient elasticity simulation. Pseudo‐transient continuation improves efficiency by enabling larger time steps than possible with a Newton iteration. Robustness improves because pseudo‐transient continuation recovers the convergence of Newton's method when the initial iterate is not within the region of local convergence. We illustrate the benefits of pseudo‐transient continuation on a non‐linear transient simulation of a buckling cylinder, including a comparison with a line search‐based Newton iteration. Copyright © 2008 John Wiley & Sons, Ltd.
DA - 2009/6/4/
PY - 2009/6/4/
DO - 10.1002/nme.2527
VL - 78
IS - 10
SP - 1209-1219
SN - 1097-0207
KW - transient elasticity
KW - finite element approximation
KW - pseudo-transient continuation
KW - Newton's method
ER -
TY - JOUR
TI - ON q-SERIES IDENTITIES ARISING FROM LECTURE HALL PARTITIONS
AU - Andrews, George E.
AU - Corteel, Sylvie
AU - Savage, Carla D.
T2 - INTERNATIONAL JOURNAL OF NUMBER THEORY
AB - In this paper, we highlight two q-series identities arising from the "five guidelines" approach to enumerating lecture hall partitions and give direct, q-series proofs. This requires two new finite corollaries of a q-analog of Gauss's second theorem. In fact, the method reveals stronger results about lecture hall partitions and anti-lecture hall compositions that are only partially explained combinatorially.
DA - 2009/3//
PY - 2009/3//
DO - 10.1142/S1793042109002134
VL - 5
IS - 2
SP - 327-337
SN - 1793-0421
KW - Lecture hall partitions
KW - q-analog of Gauss's second theorem
ER -
TY - JOUR
TI - NCSU's Virtual Computing Lab: A Cloud Computing Solution
AU - Schaffer, Henry E.
AU - Averitt, Samuel F.
AU - Hoit, Marc I.
AU - Peeler, Aaron
AU - Sills, Eric D.
AU - Vouk, Mladen A.
T2 - COMPUTER
AB - The delivery of many diverse computing services over the Internet, with flexible provisioning, has led to much greater efficiency, substantial cost savings, and many ways to enable and empower end users. NCSU's own experience with cloud computing, through its Virtual Computing Lab, indicates that this approach would be beneficial to a much wider audience.ays to enable and empower end users. NCSU's own experience with cloud computing, through its Virtual Computing Lab, indicates that this approach would be beneficial to a much wider audience.
DA - 2009/7//
PY - 2009/7//
DO - 10.1109/mc.2009.230
VL - 42
IS - 7
SP - 94-97
SN - 1558-0814
ER -
TY - JOUR
TI - Generalized mixed integer rounding inequalities: facets for infinite group polyhedra
AU - Kianfar, Kiavash
AU - Fathi, Yahya
T2 - MATHEMATICAL PROGRAMMING
DA - 2009/9//
PY - 2009/9//
DO - 10.1007/s10107-008-0216-y
VL - 120
IS - 2
SP - 313-346
SN - 0025-5610
KW - Mixed integer rounding
KW - Mixed integer programming
KW - Infinite group polyhedron
KW - Valid inequality
KW - Facet
ER -
TY - JOUR
TI - The Third International Conference of Quantitative Genetics
AU - Weir, Bruce S.
AU - Hill, William G.
AU - Zhu, Jun
AU - Zeng, Zhao-Bang
T2 - GENETICA
AB - The third International Conference of Quantitative Genetics was held at Zheijiang University, Hangzhou, China from August 18 to 24, 2007. The papers of invited speakers at the conference comprise this issue of Genetica. The first ICQG was held in Ames, Iowa in 1976 and the second in Raleigh, North Carolina in 1987. Since the conference in Raleigh statistical techniques then in their infancy, such as QTL mapping and MCMC analysis, have become standard but still developing practices. New molecular techniques have enabled individual genes contributing to variation in quantitative traits to be identified. The new technologies of genomics and gene expression arrays provide new opportunities to understand the genetic basis of quantitative characters, but also new problems in statistical inference. The application of quantitative genetics has broadened from primarily animal and plant breeding into the genetics of human disease and the analyses of natural populations and their evolution. Indeed, it is now often termed the genetics of complex traits, in recognition of the fact that most diseases, for example, are not determined by just one or a handful of genes. The death of quantitative genetics has been forecast for 40 years or more; but it lives on, strongly. The wide range of topics and methods discussed in these papers show the diversity of applications of quantitative genetics and of the technologies employed. The conference was run as a single session in order to foster interactions and exchange of ideas and problems among those working on these different systems, species and technologies. In addition a number of selected short papers were presented in the oral sessions and others as posters. There were a total of 201 delegates at the conference, including 129 from outside the home country, who had opportunity to see and hear about research in quantitative genetics in China. Zhejiang University is one of the five most highly ranked research institutions in China, and arose from the merger of four specialist universities in the city. A new campus is being built and part of the University is already on that site. The City of Hangzhou is one of the seven ancient capital cities of China, and has many attractive features, including the famed West Lake. It is the capital city of Zheijiang province and has a population of nearly 4 million. Participants in Hangzhou considered intervals of 10 or 20 years far too long to enable adequate discussion and review of a changing subject, and that 5 years should be aimed for. Accordingly, the fourth conference will be held in Edinburgh in 2012. Those from outside the University are grateful to Jun Zhu and to the large team of staff and students at Zheijiang University led by Longjian Fan who undertook all the work and were exposed to the stresses and strains of managing a successful large conference. The conference and social events were excellent and provided many visitors their first exposure to Chinese culture. We are also grateful to Ron B. S. Weir Department of Biostatistics, University of Washington, Seattle, WA 98915, USA
DA - 2009/6//
PY - 2009/6//
DO - 10.1007/s10709-008-9315-1
VL - 136
IS - 2
SP - 211-212
SN - 1573-6857
ER -
TY - JOUR
TI - Online Switching Control of LFT Parameter-Dependent Systems
AU - Dong, Ke
AU - Wu, Fen
T2 - JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME
AB - To improve controlled performance and expand gain-scheduling control capability, we propose a switching control approach of linear fractional transformation parameter-dependent systems using multiple Lyapunov functions combined with online control techniques. At each switching instant, a gain-scheduled controller working for the next switching interval will be designed online. The switching control synthesis condition is formulated as linear matrix inequalities and can be solved efficiently, upon which the controller will be constructed. The online switching control scheme is demonstrated using an uninhabited combat aerospace vehicle problem.
DA - 2009/3//
PY - 2009/3//
DO - 10.1115/1.3023140
VL - 131
IS - 2
SP -
SN - 1528-9028
KW - control system synthesis
KW - linear matrix inequalities
KW - linear systems
KW - Lyapunov methods
KW - time-varying systems
ER -
TY - JOUR
TI - On the Modeling of Honest Players in Reputation Systems
AU - Zhang, Qing
AU - Wei, Wei
AU - Yu, Ting
T2 - JOURNAL OF COMPUTER SCIENCE AND TECHNOLOGY
DA - 2009/9//
PY - 2009/9//
DO - 10.1007/s11390-009-9271-y
VL - 24
IS - 5
SP - 808-819
SN - 1860-4749
KW - reputation
KW - trust
KW - user behavior modeling
KW - collusion-resilient behavior testing
ER -
TY - JOUR
TI - Nonlinear H-infinity Control Designs with Axisymmetric Spacecraft Control
AU - Zheng, Qian
AU - Wu, Fen
T2 - JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
AB - In this paper, we study nonlinear control of a spacecraft symmetric about its principal axis with two control torques. Using a computationally efficient H ∞ control design procedure, attitude stabilization and command tracking problems of the axisymmetric spacecraft are solved locally. The proposed nonlinear H ∞ control approach uses higher order Lyapunov functions and reformulates the difficult Hamilton―Jacobian―Isaacs inequalities as semidefinite optimization conditions. Sum-of-squares programming techniques are then applied to obtain computationally tractable solutions, from which nonlinear control laws will be constructed. The nonlinear H ∞ control designs for spacecraft are capable of exploiting the most suitable forms of Lyapunov functions for performance improvement.
DA - 2009///
PY - 2009///
DO - 10.2514/1.40060
VL - 32
IS - 3
SP - 850-859
SN - 1533-3884
ER -
TY - JOUR
TI - Multi-new product competition in duopoly: A differential game analysis
AU - Medhin, N. G.
AU - Wan, W.
T2 - Dynamic Systems and Applications
DA - 2009///
PY - 2009///
VL - 18
IS - 2
SP - 161-178
ER -
TY - JOUR
TI - Minimizing transceivers in optical path networks
AU - Iyer, Prashant
AU - Dutta, Rudra
AU - Savage, Carla D.
T2 - JOURNAL OF OPTICAL NETWORKING
AB - The problem of routing traffic on multihop clear optical channels and deciding the virtual topology of optical channels to form on a physical network of fibers to minimize the cost of electronic switching equipment has become known as traffic grooming in optical networks. Traffic grooming is recognized as an important research area, because the joint opto-electric routing problem is a hard one, yet necessary because of the large cost of pure electronic switching. This problem has been shown to be NP-complete (nondeterminstic polynomial complete) even for very simple practical topologies such as a path network. In previous work, we have shown that at least the subproblem of routing traffic on a given virtual topology to minimize electronic switching (NP-hard for path networks with arbitrary traffic matrices) becomes polynomial when the traffic on the path is restricted to be egress traffic, that is, all traffic requests are destined for a single egress node. In that work, the objective was to minimize the raw OEO (opto-electro-optic) metric (number of bits electronically switched per second) totaled over all network nodes. Of late, it has become clear that electronic switching equipment cost is best counted in quantized units, e.g., in the number of transceiver interfaces at network nodes. In this paper, we consider the traffic grooming problem in unidirectional, WDM path networks with the goal of minimizing the number of transceivers. We conclusively show that the problem is NP-hard, even under the restriction of the egress traffic model. In the case of egress traffic, we give a simple heuristic that will never be worse than twice the optimal.
DA - 2009/5/1/
PY - 2009/5/1/
DO - 10.1364/JON.8.000454
VL - 8
IS - 5
SP - 454-461
SN - 1536-5379
ER -
TY - JOUR
TI - Measurement-based optimal resource allocation for network services with pricing differentiation
AU - Kallitsis, M. G.
AU - Michailidis, G.
AU - Devetsikiotis, M.
T2 - PERFORMANCE EVALUATION
AB - In this paper, we introduce a model for allocating available resources in service-oriented network, with particular focus on delay sensitive services. The model is based on a pricing scheme for the offered services and also takes into consideration the quality of service requirements of each service class through a probabilistic delay-bound constraint. The proposed policy is dynamic in nature and relies on online measurements of the incoming traffic for adjusting the class allocations. We illustrate its performance and its robustness to various tuning parameters through an extensive simulation study that considers various simulation scenarios including experiments based on real network traces.
DA - 2009/9//
PY - 2009/9//
DO - 10.1016/j.peva.2009.03.003
VL - 66
IS - 9-10
SP - 505-523
SN - 1872-745X
KW - Resource allocation
KW - Optimization
KW - Measurement
KW - Prediction
ER -
TY - JOUR
TI - Experimental implementation of a hybrid nonlinear control design for magnetostrictive actuators
AU - Oates, W. S.
AU - Evans, P. G.
AU - Smith, Ralph
AU - Dapino, M. J.
T2 - Journal of Dynamic Systems, Measurement, and Control
DA - 2009///
PY - 2009///
DO - 10.21236/ada459020
VL - 131
IS - 4
ER -
TY - JOUR
TI - An additive Schwarz preconditioner for the mortar-type rotated Q(1) FEM for elliptic problems with discontinuous coefficients
AU - Wang, Feng
AU - Chen, Jinru
AU - Xu, Wei
AU - Li, Zhilin
T2 - APPLIED NUMERICAL MATHEMATICS
AB - In this paper, we propose an additive Schwarz preconditioner for the mortar-type rotated Q1 finite element method for second order elliptic partial differential equations with piecewise but discontinuous coefficients. The work here is an extension of the research presented in [L. Marcinkowski, Additive Schwarz method for mortar discretization of elliptic problems with P1 non-conforming elements, BIT 45 (2005) 375–394]. Our analysis is valid for rectangular or L-shaped domains, which are partitioned by rectangular subdomains and meshes. We have shown that our proposed method has a quasi-optimal convergence behavior, i.e., the condition number of the preconditioned problem is O((1+log(H/h))2), which is independent of the jump in the coefficient. Numerical experiments presented in this paper have confirmed our theoretical analysis.
DA - 2009/7//
PY - 2009/7//
DO - 10.1016/j.apnum.2008.11.006
VL - 59
IS - 7
SP - 1657-1667
SN - 1873-5460
KW - Domain decomposition
KW - Mortar finite element method
KW - Additive Schwarz method
KW - Rotated Q(1) element
ER -
TY - JOUR
TI - Amoeba: A Methodology for Modeling and Evolving Cross-Organizational Business Processes
AU - Desai, Nirmit
AU - Chopra, Amit K.
AU - Singh, Munindar P.
T2 - ACM TRANSACTIONS ON SOFTWARE ENGINEERING AND METHODOLOGY
AB - Business service engagements involve processes that extend across two or more autonomous organizations. Because of regulatory and competitive reasons, requirements for cross-organizational business processes often evolve in subtle ways. The changes may concern the business transactions supported by a process, the organizational structure of the parties participating in the process, or the contextual policies that apply to the process. Current business process modeling approaches handle such changes in an ad hoc manner, and lack a principled means for determining what needs to be changed and where. Cross-organizational settings exacerbate the shortcomings of traditional approaches because changes in one organization can potentially affect the workings of another. This article describes Amoeba, a methodology for business processes that is based on business protocols . Protocols capture the business meaning of interactions among autonomous parties via commitments. Amoeba includes guidelines for (1) specifying cross-organizational processes using business protocols, and (2) handling the evolution of requirements via a novel application of protocol composition. This article evaluates Amoeba using enhancements of a real-life business scenario of auto-insurance claim processing, and an aerospace case study.
DA - 2009/10//
PY - 2009/10//
DO - 10.1145/1571629.1571632
VL - 19
IS - 2
SP -
SN - 1557-7392
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-70350223832&partnerID=MN8TOARS
KW - Design
KW - Business process modeling
KW - requirements evolution
KW - business protocols
ER -
TY - JOUR
TI - Special Issue on Advances in Broadband Wireless Networks
AU - Wang, Wenye
AU - Devetsikiotis, Michael
T2 - MOBILE NETWORKS & APPLICATIONS
DA - 2009/8//
PY - 2009/8//
DO - 10.1007/s11036-009-0159-4
VL - 14
IS - 4
SP - 365-367
SN - 1383-469X
ER -
TY - JOUR
TI - Regional stabilisation of polynomial non-linear systems using rational Lyapunov functions
AU - Zheng, Qian
AU - Wu, Fen
T2 - INTERNATIONAL JOURNAL OF CONTROL
AB - In this article, we propose a new non-linear stabilisation approach based on the popular linear parameter-varying control techniques. The regional state-feedback control problem of polynomial non-linear systems will be studied using rational Lyapunov functions of states. By bounding the variation rates of each state, the domain of attraction will be embedded in the region specified by the non-linear vector field. As a result, the state-feedback stabilisation conditions will be formulated as a set of polynomial matrix inequalities and can be solved efficiently by sum-of-squares programming. The resulting Lyapunov matrix and state-feedback gains are typically state-dependent rational matrix functions. This approach is also extended to a class of output-dependent non-linear systems where the stabilising output-feedback controller can be synthesised using rational Lyapunov functions of outputs. Finally, several examples will be used to demonstrate the proposed stabilisation approach and clarify the effect of various choices of Lyapunov function forms and state constraints.
DA - 2009///
PY - 2009///
DO - 10.1080/00207170802627267
VL - 82
IS - 9
SP - 1605-1615
SN - 1366-5820
KW - polynomial non-linear systems
KW - rational Lyapunov function
KW - domain of attraction
KW - regional stabilisation
KW - SOS programming
ER -
TY - JOUR
TI - Quasivelocities and symmetries in non-holonomic systems
AU - Bloch, Anthony M.
AU - Marsden, Jerrold E.
AU - Zenkov, Dmitry V.
T2 - DYNAMICAL SYSTEMS-AN INTERNATIONAL JOURNAL
AB - This article is concerned with the theory of quasivelocities for non-holonomic systems. The equations of non-holonomic mechanics are derived using the Lagrange–d'Alembert principle written in an arbitrary configuration-dependent frame. The article also shows how quasivelocities may be used in the formulation of non-holonomic systems with symmetry. In particular, the use of quasivelocities in the analysis of symmetry that leads to unusual momentum conservation laws is investigated, as is the applications of these conservation laws and discrete symmetries to the qualitative analysis of non-holonomic dynamics. The relationship between asymptotic dynamics and discrete symmetries of the system is also elucidated.
DA - 2009///
PY - 2009///
DO - 10.1080/14689360802609344
VL - 24
IS - 2
SP - 187-222
SN - 1468-9375
KW - Hamel equations
KW - momentum
KW - symmetry
ER -
TY - JOUR
TI - Quantification of hysteresis and nonlinear effects on the frequency response of ferroelectric and ferromagnetic materials
AU - Stuebner, M.
AU - Atulasimha, J.
AU - Smith, R. C.
T2 - SMART MATERIALS AND STRUCTURES
AB - Ferroelectric (e.g., PZT and PMN) and ferromagnetic (e.g., Terfenol-D) materials exhibit high energy densities, broadband drive capabilities, and the capacity for both actuating and sensing. This makes them attractive as compact transducers for a wide range of applications. However, the materials also exhibit hysteresis and constitutive nonlinearities, at all drive levels, that must be quantified and accommodated to achieve stringent tracking requirements. Whereas considerable effort has been made on model development and understanding these materials in the parameter space and time domain, comprehensive quantification of these effects in the frequency domain is currently lacking. In this paper, we employ the homogenized energy model, in combination with thin beam theory, to quantify the frequency domain behavior of ferroelectric and ferromagnetic materials. This model combines energy analysis at the lattice level with stochastic homogenization techniques to provide a framework that effectively quantifies the effect of hysteresis, constitutive nonlinearities, bias fields and AC drive levels on the material dynamics in both the time and frequency domains. Aspects of the model are illustrated and validated through numerical and experimental examples.
DA - 2009/10//
PY - 2009/10//
DO - 10.1088/0964-1726/18/10/104019
VL - 18
IS - 10
SP -
SN - 1361-665X
ER -
TY - JOUR
TI - Multiple interval mapping for gene expression QTL analysis
AU - Zou, Wei
AU - Zeng, Zhao-Bang
T2 - GENETICA
DA - 2009/11//
PY - 2009/11//
DO - 10.1007/s10709-009-9365-z
VL - 137
IS - 2
SP - 125-134
SN - 1573-6857
KW - eQTL
KW - FDR
KW - MIM
KW - Model selection
ER -
TY - JOUR
TI - Monitoring autocorrelated processes using a distribution-free tabular CUSUM chart with automated variance estimation
AU - Lee, Joongsup
AU - Alexopoulos, Christos
AU - Goldsman, David
AU - Kim, Seong-Hee
AU - Tsui, Kwok-Leung
AU - Wilson, James R.
T2 - IIE TRANSACTIONS
AB - We formulate and evaluate distribution-free statistical process control (SPC) charts for monitoring shifts in the mean of an autocorrelated process when a training data set is used to estimate the marginal variance of the process and the variance parameter (i.e., the sum of covariances at all lags). Two alternative variance estimators are adapted for automated use in DFTC-VE, a distribution-free tabular CUSUM chart, based on the simulation-analysis methods of standardized time series and a simplified combination of autoregressive representation and non-overlapping batch means. Extensive experimentation revealed that these variance estimators did not seriously degrade DFTC-VE's performance compared with its performance using the exact values of the marginal variance and the variance parameter. Moreover, DFTC-VE's performance compared favorably with that of other competing distribution-free SPC charts. [Supplementary materials are available for this article. Go to the publisher's online edition of IIE Transactions for the following free supplementary resource: Appendix]
DA - 2009/11//
PY - 2009/11//
DO - 10.1080/07408170902906035
VL - 41
IS - 11
SP - 979-994
SN - 1545-8830
KW - Statistical process control
KW - Shewhart chart
KW - tabular CUSUM chart
KW - autocorrelated data
KW - average run length
KW - distribution-free statistical methods
KW - variance estimation
ER -
TY - JOUR
TI - Lyapunov Redesign of Adaptive Controllers for Polynomial Nonlinear Systems
AU - Zheng, Qian
AU - Wu, Fen
T2 - 2009 AMERICAN CONTROL CONFERENCE, VOLS 1-9
AB - In this paper, we study adaptive control redesign problem of polynomial nonlinear systems with matching parametric uncertainties. By transforming the system into its corresponding error dynamics, we will develop an adaptive control scheme in attenuating the effect of the unknown parameters on the controlled output, which is composed of tracking errors and control efforts. To achieve better controlled performance, the Lyapunov functions will be relaxed from quadratic to higher order and the resulting controller gain is generalized from constant to parameter dependent. The synthesis conditions of adaptive control will be formulated as polynomial matrix inequalities and are solvable by recast the resulting conditions into a Sum of Squares (SOS) optimization problem, from which the adaptive control law as well as the parameter adaptation law are derived with zero tracking and parameter estimation errors. An example is provided to demonstrate effectiveness of the proposed adaptive control redesign approach.
DA - 2009///
PY - 2009///
DO - 10.1109/acc.2009.5160128
SP - 5144-5149
SN - 2378-5861
KW - Adaptive control
KW - parametric uncertainties
KW - higher-order Lyapunov function
KW - SOS programming
ER -
TY - JOUR
TI - Global optimization for a class of fractional programming problems
AU - Fang, Shu-Cherng
AU - Gao, David Y.
AU - Sheu, Ruey-Lin
AU - Xing, Wenxun
T2 - JOURNAL OF GLOBAL OPTIMIZATION
DA - 2009/11//
PY - 2009/11//
DO - 10.1007/s10898-008-9378-7
VL - 45
IS - 3
SP - 337-353
SN - 1573-2916
KW - Quadratic fractional programming
KW - Sum-of-ratios
KW - Global optimization
KW - Canonical duality
ER -
TY - JOUR
TI - Convergence Analysis of Sampling Methods for Perturbed {L}ipschitz Functions
AU - Finkel, D E
AU - Kelley, C T
T2 - Pacific J. Opt.
DA - 2009///
PY - 2009///
VL - 5
IS - 2
SP - 339-350
ER -
TY - JOUR
TI - Contribution of genetic effects to genetic variance components with epistasis and linkage disequilibrium
AU - Wang, Tao
AU - Zeng, Zhao-Bang
T2 - BMC GENETICS
AB - Cockerham genetic models are commonly used in quantitative trait loci (QTL) analysis with a special feature of partitioning genotypic variances into various genetic variance components, while the F(infinity) genetic models are widely used in genetic association studies. Over years, there have been some confusion about the relationship between these two type of models. A link between the additive, dominance and epistatic effects in an F(infinity) model and the additive, dominance and epistatic variance components in a Cockerham model has not been well established, especially when there are multiple QTL in presence of epistasis and linkage disequilibrium (LD).In this paper, we further explore the differences and links between the F(infinity) and Cockerham models. First, we show that the Cockerham type models are allelic based models with a special modification to correct a confounding problem. Several important moment functions, which are useful for partition of variance components in Cockerham models, are also derived. Next, we discuss properties of the Finfinity models in partition of genotypic variances. Its difference from that of the Cockerham models is addressed. Finally, for a two-locus biallelic QTL model with epistasis and LD between the loci, we present detailed formulas for calculation of the genetic variance components in terms of the additive, dominant and epistatic effects in an F(infinity) model. A new way of linking the Cockerham and F(infinity) model parameters through their coding variables of genotypes is also proposed, which is especially useful when reduced F(infinity) models are applied.The Cockerham type models are allele-based models with a focus on partition of genotypic variances into various genetic variance components, which are contributed by allelic effects and their interactions. By contrast, the F(infinity) regression models are genotype-based models focusing on modeling and testing of within-locus genotypic effects and locus-by-locus genotypic interactions. When there is no need to distinguish the paternal and maternal allelic effects, these two types of models are transferable. Transformation between an F(infinity) model's parameters and its corresponding Cockerham model's parameters can be established through a relationship between their coding variables of genotypes. Genetic variance components in terms of the additive, dominance and epistatic genetic effects in an F(infinity) model can then be calculated by translating formulas derived for the Cockerham models.
DA - 2009/9/4/
PY - 2009/9/4/
DO - 10.1186/1471-2156-10-52
VL - 10
SP -
SN - 1471-2156
ER -
TY - JOUR
TI - Completions of implicitly defined linear time varying vector fields
AU - Okay, Irfan
AU - Campbell, Stephen L.
AU - Kunkel, Peter
T2 - LINEAR ALGEBRA AND ITS APPLICATIONS
AB - The stabilization of constraints through such techniques as Baumgarte stabilization has been used in the simulation community for some time. This and a number of control problems can be viewed as either extending, or modifying, a vector field off of some manifold. Generally these approaches required the equations to have a special structure. Motivated by numerical simulation there has recently been new progress on doing this stabilization in numerically robust ways for larger classes of systems. In this paper we point out how earlier linear time invariant results do not immediately apply to the linear time varying case and then analyze the linear time varying case.
DA - 2009/10/1/
PY - 2009/10/1/
DO - 10.1016/j.laa.2009.05.006
VL - 431
IS - 9
SP - 1422-1438
SN - 1873-1856
KW - Differential algebraic equations
KW - Numerical methods
KW - Linear systems
KW - Stability
ER -
TY - JOUR
TI - ASYMPTOTIC PROPERTIES OF FEEDBACK SOLUTIONS FOR A CLASS OF QUANTUM CONTROL PROBLEMS
AU - Ito, Kazufumi
AU - Kunisch, Karl
T2 - SIAM JOURNAL ON CONTROL AND OPTIMIZATION
AB - Control of quantum systems described by the Schrödinger equation is considered. Feedback control laws are developed for orbit tracking via controlled Hamiltonians, and their asymptotic properties are analyzed. Numerical integration via time splitting is also investigated and used to demonstrate the feasibility of the proposed feedback laws.
DA - 2009///
PY - 2009///
DO - 10.1137/080720784
VL - 48
IS - 4
SP - 2323-2343
SN - 1095-7138
KW - feedback control
KW - asymptotic tracking
KW - Schrodinger equations
ER -
TY - JOUR
TI - A smoothing technique for discrete delta functions with application to immersed boundary method in moving boundary simulations
AU - Yang, Xiaolei
AU - Zhang, Xing
AU - Li, Zhilin
AU - He, Guo-Wei
T2 - JOURNAL OF COMPUTATIONAL PHYSICS
AB - The effects of complex boundary conditions on flows are represented by a volume force in the immersed boundary methods. The problem with this representation is that the volume force exhibits non-physical oscillations in moving boundary simulations. A smoothing technique for discrete delta functions has been developed in this paper to suppress the non-physical oscillations in the volume forces. We have found that the non-physical oscillations are mainly due to the fact that the derivatives of the regular discrete delta functions do not satisfy certain moment conditions. It has been shown that the smoothed discrete delta functions constructed in this paper have one-order higher derivative than the regular ones. Moreover, not only the smoothed discrete delta functions satisfy the first two discrete moment conditions, but also their derivatives satisfy one-order higher moment condition than the regular ones. The smoothed discrete delta functions are tested by three test cases: a one-dimensional heat equation with a moving singular force, a two-dimensional flow past an oscillating cylinder, and the vortex-induced vibration of a cylinder. The numerical examples in these cases demonstrate that the smoothed discrete delta functions can effectively suppress the non-physical oscillations in the volume forces and improve the accuracy of the immersed boundary method with direct forcing in moving boundary simulations.
DA - 2009/11/1/
PY - 2009/11/1/
DO - 10.1016/j.jcp.2009.07.023
VL - 228
IS - 20
SP - 7821-7836
SN - 1090-2716
KW - Immersed boundary method
KW - Moving boundary
KW - Non-physical force oscillations
KW - Smoothed discrete delta function
ER -
TY - JOUR
TI - A discrete-time queueing network model of a hub-based OBS architecture
AU - Mountrouidou, Xenia
AU - Perros, Harry
T2 - TELECOMMUNICATION SYSTEMS
DA - 2009/7//
PY - 2009/7//
DO - 10.1007/s11235-009-9157-x
VL - 41
IS - 3
SP - 173-184
SN - 1572-9451
KW - Optical Burst Switching
KW - Hub
KW - Queueing network
KW - Burst aggregation
KW - Decomposition algorithm
ER -
TY - JOUR
TI - Some additive results on Drazin inverses
AU - Patricio, P.
AU - Hartwig, R. E.
T2 - Applied Mathematics and Computation
AB - In this paper, some additive results on Drazin inverse of a sum of Drazin invertible elements are derived. Some converse results are also presented.
DA - 2009///
PY - 2009///
DO - 10.1016/j.amc.2009.05.021
VL - 215
IS - 2
SP - 530-538
ER -
TY - JOUR
TI - On the existence of symmetric chain decompositions in a quotient of the Boolean lattice
AU - Jiang, Zongliang
AU - Savage, Carla D.
T2 - DISCRETE MATHEMATICS
AB - We highlight a question about binary necklaces, i.e., equivalence classes of binary strings under rotation. Is there a way to choose representatives of the n-bit necklaces so that the subposet of the Boolean lattice induced by those representatives has a symmetric chain decomposition? Alternatively, is the quotient of the Boolean lattice Bn, under the action of the cyclic group Zn, a symmetric chain order? The answer is known to be yes for all prime n and for composite n≤18, but otherwise the question appears to be open. In this note we describe how it suffices to focus on subposets induced by necklaces with periodic block codes, substantially reducing the size of the problem. We mention a motivating application: determining whether minimum-region rotationally symmetric independent families of n curves exist for all n.
DA - 2009/9/6/
PY - 2009/9/6/
DO - 10.1016/j.disc.2007.11.036
VL - 309
IS - 17
SP - 5278-5283
SN - 1872-681X
KW - Symmetric chain decompositions
KW - Necklaces
KW - Quotients of the Boolean lattice
ER -
TY - JOUR
TI - OPTIMAL STOPPING PROBLEM FOR STOCHASTIC DIFFERENTIAL EQUATIONS WITH RANDOM COEFFICIENTS
AU - Chang, Mou-Hsiung
AU - Pang, Tao
AU - Yong, Jiongmin
T2 - SIAM JOURNAL ON CONTROL AND OPTIMIZATION
AB - An optimal stopping problem for stochastic differential equations with random coefficients is considered. The dynamic programming principle leads to a Hamiltion–Jacobi–Bellman equation, which, for the current case, is a backward stochastic partial differential variational inequality (BSPDVI, for short) for the value function. Well-posedness of such a BSPDVI is established, and a verification theorem is proved.
DA - 2009///
PY - 2009///
DO - 10.1137/070705726
VL - 48
IS - 2
SP - 941-971
SN - 1095-7138
KW - optimal stopping
KW - random coefficients
KW - dynamic programming principle
KW - backward stochastic partial differential variational inequality
KW - verification theorem
ER -
TY - JOUR
TI - LAGRANGE MULTIPLIER APPROACH WITH OPTIMIZED FINITE DIFFERENCE STENCILS FOR PRICING AMERICAN OPTIONS UNDER STOCHASTIC VOLATILITY
AU - Ito, Kazufumi
AU - Toivanen, Jari
T2 - SIAM JOURNAL ON SCIENTIFIC COMPUTING
AB - The deterministic numerical valuation of American options under Heston's stochastic volatility model is considered. The prices are given by a linear complementarity problem with a two-dimensional parabolic partial differential operator. A new truncation of the domain is described for small asset values, while for large asset values and variance a standard truncation is used. The finite difference discretization is constructed by numerically solving a quadratic optimization problem aiming to minimize the truncation error at each grid point. A Lagrange approach is used to treat the linear complementarity problems. Numerical examples demonstrate the accuracy and effectiveness of the proposed approach.
DA - 2009///
PY - 2009///
DO - 10.1137/07070574X
VL - 31
IS - 4
SP - 2646-2664
SN - 1095-7197
KW - American option pricing
KW - stochastic volatility model
KW - linear complementarity problem
KW - finite difference method
KW - quadratic programming
KW - multigrid method
KW - Lagrange method
KW - penalty method
ER -
TY - JOUR
TI - Edge-Reconfigurable Optical Networks (ERONs): Rationale, Network Design, and Evaluation
AU - Karmous-Edwards, Gigi
AU - Vishwanath, Arun
AU - Reeves, Douglas S.
AU - Battestilli, Lina
AU - Vegesna, Priyanka B.
AU - Rouskas, George N.
T2 - JOURNAL OF LIGHTWAVE TECHNOLOGY
AB - To bridge the gap between the current practice of setting up expensive, dedicated, lightpath connections (i.e., static topologies), and the distant future vision of inexpensive access to dynamically switched end-to-end lightpaths, we propose a medium term solution in the form of edge-reconfigurable optical networks (ERONs) . An ERON is an overlay-control network created by installing readily available MEMS optical switches, and implementing a GMPLS control plane at sites interconnected by static lightpaths. The switches and control software are deployed at the edge of the network and operated by the organization-user (i.e., outside the network provider's control), hence the term ldquoedge-reconfigurablerdquo. By providing dynamic, automated control of end-to-end lightpaths, ERONs enable the sharing of expensive network resources among multiple users and applications that require sporadic access to these resources. We develop an algorithm for creating an ERON from an existing topology of static lightpaths. We also present simulation results that quantify the benefits of ERONs, in terms of the number of lightpaths that are needed when compared to a static configuration of independent and dedicated circuits.
DA - 2009/6/15/
PY - 2009/6/15/
DO - 10.1109/JLT.2009.2021279
VL - 27
IS - 12
SP - 1837-1845
SN - 1558-2213
KW - Dynamic circuits
KW - network design
KW - optical networks
ER -
TY - JOUR
TI - Economic analysis of US textile production activities under the North American Free Trade Agreement
AU - Lim, M.
AU - Suh, M. W.
AU - Gaskill, L.
T2 - JOURNAL OF THE TEXTILE INSTITUTE
AB - This economic analysis investigates the US textile industry's output supply and input demand pattern under the influence of North American Free Trade Agreement (NAFTA) and determines the significance of the agreement on the industry. This analysis employs the normalized restricted translog profit model as an analytical tool and introduces a time dummy variable in the model to distinguish the pre- and post-NAFTA years. The outcome of analysis shows the significant but negative effect of NAFTA on the industry's profit performance in the early years of the agreement, probably due to intensified import competition, fall of real output prices, and numerous mill closings. NAFTA, however, is identified as less significant than variable input prices of labor, material, and electricity. The elasticity estimates show the dominant role of maintenance and capital expenditures, followed by textile output and variable input prices in order, in determining the industry's output supply and input demand. Overall, NAFTA is identified as a short-term solution to the US textile industry's fundamental problems of high labor costs and declining price competitiveness.
DA - 2009///
PY - 2009///
DO - 10.1080/00405000802125170
VL - 100
IS - 7
SP - 612-625
SN - 0040-5000
KW - economic analysis
KW - NAFTA
KW - textile production
KW - normalized restricted translog profit model
ER -
TY - JOUR
TI - An update on the middle levels problem
AU - Shields, Ian
AU - Shields, Brendan J.
AU - Savage, Carla D.
T2 - DISCRETE MATHEMATICS
AB - The middle levels problem is to find a Hamilton cycle in the middle levels, M2k+1, of the Hasse diagram of B2k+1 (the partially-ordered set of subsets of a 2k+1-element set ordered by inclusion). Previously, the best known, from [I. Shields, C.D. Savage, A Hamilton path heuristic with applications to the middle two levels problem, in: Proceedings of the Thirtieth Southeastern International Conference on Combinatorics, Graph Theory, and Computing (Boca Raton, FL, 1999), vol. 140, 1999], was that M2k+1 is Hamiltonian for all positive k through k=15. In this note we announce that M33 and M35 have Hamilton cycles. The result was achieved by an algorithmic improvement that made it possible to find a Hamilton path in a reduced graph (of complementary necklace pairs) having 129,644,790 vertices, using a 64-bit personal computer.
DA - 2009/9/6/
PY - 2009/9/6/
DO - 10.1016/j.disc.2007.11.010
VL - 309
IS - 17
SP - 5271-5277
SN - 0012-365X
KW - Hamilton cycles
KW - Middle levels
KW - Boolean lattice
KW - Necklaces
ER -
TY - JOUR
TI - Probabilistic Cost-Effectiveness Comparison of Screening Strategies for Colorectal Cancer
AU - Tafazzoli, Ali
AU - Roberts, Stephen
AU - Klein, Robert
AU - Ness, Reid
AU - Dittus, Robert
T2 - ACM TRANSACTIONS ON MODELING AND COMPUTER SIMULATION
AB - A stochastic discrete-event simulation model of the natural history of Colorectal Cancer (CRC) is augmented with screening technology representations to create a base for simulating various screening strategies for CRC. The CRC screening strategies recommended by the American Gastroenterological Association (AGA) and the newest screening strategies for which clinical efficacy has been established are simulated. In addition to verification steps, validation of screening is pursued by comparison with the Minnesota Colon Cancer Control Study. The model accumulates discounted costs and quality-adjusted life-years. The natural variability in the modeled random variables for natural history is conditioned using a probabilistic sensitivity analysis through a two-stage sampling process that adds other random variables representing parametric uncertainty. The analysis of the screening alternatives in a low-risk population explores both deterministic and stochastic dominance to eliminate some screening alternatives. Net benefit analysis, based on willingness to pay for quality-adjusted life-years, is used to compare the most cost-effective strategies through acceptability curves and to make a screening recommendation. Methodologically, this work demonstrates how variability from the natural variation in the development, screening, and treatment of a disease can be combined with the variation in parameter uncertainty. Furthermore, a net benefit analysis that characterizes cost-effectiveness alternatives can explicitly depend on variation from all sources producing a probabilistic cost-effectiveness analysis of decision alternatives.
DA - 2009/3//
PY - 2009/3//
DO - 10.1145/1502787.1502789
VL - 19
IS - 2
SP -
SN - 1558-1195
KW - Cost-effectiveness analysis
KW - probabilistic sensitivity analysis
KW - net benefit analysis
KW - acceptability curves
KW - colorectal cancer screening strategies
KW - medical decision making
ER -
TY - JOUR
TI - On the shape derivative for problems of Bernoulli type
AU - Haslinger, J.
AU - Ito, K.
AU - Kozubek, T.
AU - Kunisch, K.
AU - Peichl, G.
T2 - Interfaces and Free Boundaries
AB - The shape derivative of the cost functional in a Bernoulli-type problem is characterized. The calculation of the derivative of the cost does not use the shape derivative of the state variable and is achieved under mild regularity conditions on the boundary of the domain.
DA - 2009///
PY - 2009///
DO - 10.4171/ifb/213
VL - 11
IS - 2
SP - 317-330
ER -
TY - JOUR
TI - Coupling winds to ocean surface currents over the global ocean
AU - Deng, Zengan
AU - Xie, Lian
AU - Liu, Bin
AU - Wu, Kejian
AU - Zhao, Dongliang
AU - Yu, Ting
T2 - OCEAN MODELLING
AB - A Wind stress–Current Coupled System (WCCS) consisting of the HYbrid Coordinate Ocean Model (HYCOM) and an improved wind stress algorithm based on Donelan et al. [Donelan, W.M., Drennan, Katsaros, K.B., 1997. The air–sea momentum flux in mixed wind sea and swell conditions. J. Phys. Oceanogr. 27, 2087–2099] is developed by using the Earth System Modeling Framework (ESMF). The WCCS is applied to the global ocean to study the interactions between the wind stress and the ocean surface currents. In this study, the ocean surface current velocity is taken into consideration in the wind stress calculation and air–sea heat flux calculation. The wind stress that contains the effect of ocean surface current velocity will be used to force the HYCOM. The results indicate that the ocean surface velocity exerts an important influence on the wind stress, which, in turn, significantly affects the global ocean surface currents, air–sea heat fluxes, and the thickness of ocean surface boundary layer. Comparison with the TOGA TAO buoy data, the sea surface temperature from the wind–current coupled simulation showed noticeable improvement over the stand-alone HYCOM simulation.
DA - 2009///
PY - 2009///
DO - 10.1016/j.ocemod.2009.05.003
VL - 29
IS - 4
SP - 261-268
SN - 1463-5011
KW - Wind-Current Coupled System
KW - HYCOM
KW - Wind stress
KW - Heat flux
KW - Ocean surface boundary layer
KW - ESMF
KW - Ocean current
ER -
TY - JOUR
TI - Topology Stability Analysis and Its Application in Hierarchical Mobile Ad Hoc Networks
AU - Xu, Yi
AU - Wang, Wenye
T2 - IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
AB - The hierarchical architecture has been proven effective for solving the scalability problems in large-scale ad hoc networks. The stability of the hierarchical architecture is a key factor in determining the network performance. Although many solutions have been proposed to construct stable clusters, the maximum stability achievable in mobile environments is still unknown. In this paper, we define three metrics for measuring network stability: (1) the cluster lifetime;(2) the intercluster link lifetime; and (3) the end-to-end path lifetime. We model and analyze the maximum of these lifetimes under the constraint of random node mobility. Analytical results provide the fundamental understanding of the bounds on network stability. Inspired by this understanding, we propose a clustering algorithm and a hierarchical routing protocol that work together to achieve the maximum network stability. The analytical results are verified by simulations.
DA - 2009/3//
PY - 2009/3//
DO - 10.1109/TVT.2008.928006
VL - 58
IS - 3
SP - 1546-1560
SN - 1939-9359
KW - Clustering
KW - hierarchical architecture
KW - mobility network topology
KW - wireless ad hoc networks
ER -
TY - JOUR
TI - Strategic purchasing, supply management practices and buyer performance improvement: an empirical study of UK manufacturing organisations
AU - Lawson, Benn
AU - Cousins, Paul D.
AU - Handfield, Robert B.
AU - Petersen, Kenneth J.
T2 - INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH
AB - Purchasing is increasingly seen as an important strategic activity of the firm. However, there is little evidence examining the effects of strategic purchasing on a firm's inter-organisational supply management practices and performance. The purpose of this paper is to examine the effect of strategic purchasing on the supply management practices of socialisation, supplier integration and supplier responsiveness, together with relationship performance. Using empirical data collected from 111 United Kingdom purchasing executives, a structural equation model is used to test the theoretical framework. The results provide support for four of the six hypotheses developed. Strategic purchasing was found to have an indirect, significant effect on improving buyer performance, acting through supplier integration. Strategic purchasing also had a significant effect on the use of socialisation mechanisms, but not on supplier responsiveness. Our research indicates that close, long-term supplier relationships can lead to the creation of relational rents. Implications for future research and suggestions for improving the rigour of strategic purchasing research are made.
DA - 2009///
PY - 2009///
DO - 10.1080/00207540701694313
VL - 47
IS - 10
SP - 2649-2667
SN - 1366-588X
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-70449569471&partnerID=MN8TOARS
KW - buyer-supplier relationships
KW - strategic purchasing
KW - supply management
KW - structural equation modelling
ER -
TY - JOUR
TI - SPECIAL ISSUE ON ACCURATE SOLUTION OF EIGENVALUE PROBLEMS
AU - Ipsen, Ilse C. F.
T2 - SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS
AB - The occasion for this special issue is the Sixth International Workshop on Accurate Solution of Eigenvalue Problems, which took place at The Pennsylvania State University from May 22–25, 2006. This special issue provides an outlet for papers from the workshop and recognizes advances in the numerical solution of eigenvalue and related problems. This is the second such special issue published in the SIAM Journal on Matrix Analysis and Applications; the first was published in number 4 of volume 28 in connection with the Fifth International Workshop on Accurate Solution of Eigenvalue Problems, which took place in Hagen, Germany, from June 29 to July 1, 2004. The twelve papers in the current issue are concerned with a variety of aspects that arise in the computation of eigenvalues and invariant subspaces: perturbation bounds and sensitivity, accuracy and convergence behavior of algorithms, exploitation of structure in matrices, and particular engineering applications. Thanks go to SIMAX Editor-in-Chief, Henk van der Vorst; guest editors Jesse Barlow, Froilán Dopico, and Zlatko Drmač, who put great effort into the careful and timely review of papers; and Mitch Chernoff, Cherie Trebisky, and other members of the SIAM staff who worked hard to publish this special issue.
DA - 2009///
PY - 2009///
DO - 10.1137/sjmael000031000001000vii000001
VL - 31
IS - 1
SP - VII-VII
SN - 1095-7162
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-73649094469&partnerID=MN8TOARS
ER -
TY - JOUR
TI - REFINED PERTURBATION BOUNDS FOR EIGENVALUES OF HERMITIAN AND NON-HERMITIAN MATRICES
AU - Ipsen, I. C. F.
AU - Nadler, B.
T2 - SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS
AB - We present eigenvalue bounds for perturbations of Hermitian matrices and express the change in eigenvalues in terms of a projection of the perturbation onto a particular eigenspace, rather than in terms of the full perturbation. The perturbations we consider are Hermitian of rank one, and Hermitian or non-Hermitian with norm smaller than the spectral gap of a specific eigenvalue. Applications include principal component analysis under a spiked covariance model, and pseudo-arclength continuation methods for the solution of nonlinear systems.
DA - 2009///
PY - 2009///
DO - 10.1137/070682745
VL - 31
IS - 1
SP - 40-53
SN - 0895-4798
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-73649111433&partnerID=MN8TOARS
KW - eigenvalues
KW - Hermitian matrix
KW - eigenvalue gap
KW - perturbation bounds
KW - non-Hermitian perturbations
KW - principal components
KW - numerical continuation
ER -
TY - JOUR
TI - More efficient optimization of long-term water supply portfolios
AU - Kirsch, Brian R.
AU - Characklis, Gregory W.
AU - Dillard, Karen E. M.
AU - Kelley, C. T.
T2 - WATER RESOURCES RESEARCH
AB - The use of temporary transfers, such as options and leases, has grown as utilities attempt to meet increases in demand while reducing dependence on the expansion of costly infrastructure capacity (e.g., reservoirs). Earlier work has been done to construct optimal portfolios comprising firm capacity and transfers, using decision rules that determine the timing and volume of transfers. However, such work has only focused on the short‐term (e.g., 1‐year scenarios), which limits the utility of these planning efforts. Developing multiyear portfolios can lead to the exploration of a wider range of alternatives but also increases the computational burden. This work utilizes a coupled hydrologic‐economic model to simulate the long‐term performance of a city's water supply portfolio. This stochastic model is linked with an optimization search algorithm that is designed to handle the high‐frequency, low‐amplitude noise inherent in many simulations, particularly those involving expected values. This noise is detrimental to the accuracy and precision of the optimized solution and has traditionally been controlled by investing greater computational effort in the simulation. However, the increased computational effort can be substantial. This work describes the integration of a variance reduction technique (control variate method) within the simulation/optimization as a means of more efficiently identifying minimum cost portfolios. Random variation in model output (i.e., noise) is moderated using knowledge of random variations in stochastic input variables (e.g., reservoir inflows, demand), thereby reducing the computing time by 50% or more. Using these efficiency gains, water supply portfolios are evaluated over a 10‐year period in order to assess their ability to reduce costs and adapt to demand growth, while still meeting reliability goals. As a part of the evaluation, several multiyear option contract structures are explored and compared.
DA - 2009/3/19/
PY - 2009/3/19/
DO - 10.1029/2008wr007018
VL - 45
SP -
SN - 0043-1397
ER -
TY - JOUR
TI - A well-conditioned augmented system for solving Navier-Stokes equations in irregular domains
AU - Ito, Kazufumi
AU - Lai, Ming-Chih
AU - Li, Zhilin
T2 - JOURNAL OF COMPUTATIONAL PHYSICS
AB - An augmented method based on a Cartesian grid is proposed for the incompressible Navier–Stokes equations in irregular domains. The irregular domain is embedded into a rectangular one so that a fast Poisson solver can be utilized in the projection method. Unlike several methods suggested in the literature that set the force strengths as unknowns, which often results in an ill-conditioned linear system, we set the jump in the normal derivative of the velocity as the augmented variable. The new approach improves the condition number of the system for the augmented variable significantly. Using the immersed interface method, we are able to achieve second order accuracy for the velocity. Numerical results and comparisons to benchmark tests are given to validate the new method. A lid-driven cavity flow with multiple obstacles and different geometries are also presented.
DA - 2009/4/20/
PY - 2009/4/20/
DO - 10.1016/j.jcp.2008.12.028
VL - 228
IS - 7
SP - 2616-2628
SN - 0021-9991
KW - Navier-Stokes equations
KW - Embedding technique
KW - Immersed interface method
KW - Irregular domain
KW - Augmented system
KW - Projection method
KW - Level set representation
ER -
TY - JOUR
TI - Bayesian ROC curve estimation under binormality using a rank likelihood
AU - Gu, J. Z.
AU - Ghosal, S.
T2 - Journal of Statistical Planning and Inference
DA - 2009///
PY - 2009///
VL - 139
IS - 6
SP - 2076-2083
ER -
TY - JOUR
TI - Optimal Tracking Using Magnetostrictive Actuators Operating in Nonlinear and Hysteretic Regimes
AU - Oates, William S.
AU - Smith, Ralph C.
T2 - JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME
AB - Abstract Many active materials exhibit nonlinearities and hysteresis when driven at field levels necessary to meet stringent performance criteria in high performance applications. This often requires nonlinear control designs to effectively compensate for the nonlinear, hysteretic, field-coupled material behavior. In this paper, an optimal control design is developed to accurately track a reference signal using magnetostrictive transducers. The methodology can be directly extended to transducers employing piezoelectric materials or shape memory alloys due to the unified nature of the constitutive model employed in the control design. The constitutive model is based on a framework that combines energy analysis at lattice length scales with stochastic homogenization techniques to predict macroscopic material behavior. The constitutive model is incorporated into a finite element representation of the magnetostrictive transducer, which provides the framework for developing the finite-dimensional nonlinear control design. The control design includes an open loop nonlinear component computed off-line with perturbation feedback around the optimal state trajectory. Estimation of immeasurable states is achieved using a Kalman filter. It is shown that when operating in a highly nonlinear regime and as the frequency increases, significant performance enhancements are achieved relative to conventional proportional-integral control.
DA - 2009/5//
PY - 2009/5//
DO - 10.1115/1.3072093
VL - 131
IS - 3
SP -
SN - 0022-0434
KW - control system synthesis
KW - feedback
KW - intelligent materials
KW - intelligent structures
KW - Kalman filters
KW - magnetostrictive devices
KW - nonlinear control systems
KW - open loop systems
KW - optimal control
KW - perturbation techniques
KW - PI control
KW - piezoelectric actuators
KW - piezoelectric materials
KW - piezoelectric transducers
KW - shape memory effects
KW - stochastic processes
ER -
TY - JOUR
TI - A genetic algorithm for a single product network design model with lead time and safety stock considerations
AU - Sourirajan, Karthik
AU - Ozsen, Leyla
AU - Uzsoy, Reha
T2 - EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
AB - We consider a two-stage supply chain with a production facility that replenishes a single product at retailers. The objective is to locate distribution centers in the network such that the sum of facility location, pipeline inventory, and safety stock costs is minimized. We explicitly model the relationship between the flows in the network, lead times, and safety stock levels. We use genetic algorithms to solve the model and compare their performance to that of a Lagrangian heuristic developed in earlier work. A novel chromosome representation that combines binary vectors with random keys provides solutions of similar quality to those from the Lagrangian heuristic. The model is then extended to incorporate arbitrary demand variance at the retailers. This modification destroys the structure upon which the Lagrangian heuristic is based, but is easily incorporated into the genetic algorithm. The genetic algorithm yields significantly better solutions than a greedy heuristic for this modification and has reasonable computational requirements.
DA - 2009/9/1/
PY - 2009/9/1/
DO - 10.1016/j.ejor.2008.07.038
VL - 197
IS - 2
SP - 599-608
SN - 1872-6860
KW - Supply chain
KW - Network design
KW - Lead time
KW - Safety stock
KW - Genetic algorithm
ER -
TY - JOUR
TI - (Q, r) Inventory policies in a fuzzy uncertain supply chain environment
AU - Handfield, Robert
AU - Warsing, Don
AU - Wu, Xinmin
T2 - EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
AB - Managers have begun to recognize that effectively managing risks in their business operations plays an important role in successfully managing their inventories. Accordingly, we develop a (Q,r) model based on fuzzy-set representations of various sources of uncertainty in the supply chain. Sources of risk and uncertainty in our model include demand, lead time, supplier yield, and penalty cost. The naturally imprecise nature of these risk factors in managing inventories is represented using triangular fuzzy numbers. In addition, we introduce a human risk attitude factor to quantify the decision maker’s attitude toward the risk of stocking out during the replenishment period. The total cost of the inventory system is computed using defuzzification methods built from techniques identified in the literature on fuzzy sets. Finally, we provide numerical examples to compare our fuzzy-set computations with those generated by more traditional models that assume full knowledge of the distributions of the stochastic parameters in the system.
DA - 2009/9/1/
PY - 2009/9/1/
DO - 10.1016/j.ejor.2008.07.016
VL - 197
IS - 2
SP - 609-619
SN - 1872-6860
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-60649115627&partnerID=MN8TOARS
KW - (Q, r) System
KW - Inventory
KW - Fuzzy sets
KW - Optimization
ER -
TY - CONF
TI - Robust univariate cubic L-2 spines: Interpolating data with uncertain positions of measurements
AU - Averbakh, I.
AU - Fang, S. C.
AU - Zhao, Y. B.
C2 - 2009///
C3 - Journal of Industrial and Management Optimization
DA - 2009///
VL - 5
SP - 351-361
M1 - 2
ER -
TY - JOUR
TI - Forecast updating and supplier coordination for complementary component purchases
AU - Thomas, D. J.
AU - Warsing, Donald
AU - Zhang, X. Y.
T2 - Production and Operations Management
DA - 2009///
PY - 2009///
DO - 10.3401/poms.1080.01012
VL - 18
IS - 2
SP - 167–184
ER -
TY - JOUR
TI - A note on solution sets of interval-valued fuzzy relational equations
AU - Li, Pingke
AU - Fang, Shu-Cherng
T2 - FUZZY OPTIMIZATION AND DECISION MAKING
DA - 2009/3//
PY - 2009/3//
DO - 10.1007/s10700-009-9055-4
VL - 8
IS - 1
SP - 115-121
SN - 1573-2908
KW - Fuzzy relational equations
KW - Fuzzy relational inequalities
KW - Interval-valued system
ER -
TY - JOUR
TI - The Impact of Revenue-Maximizing Priority Pricing on Customer Delay Costs
AU - Gilland, Wendell G.
AU - Warsing, Donald P.
T2 - DECISION SCIENCES
AB - ABSTRACT Speed is an increasingly important determinant of which suppliers will be given customers' business and is defined as the time between when an order is placed by the customer and when the product is delivered, or as the amount of time customers must wait before they receive their desired service. In either case, the speed a customer experiences can be enhanced by giving priority to that particular customer. Such a prioritization scheme will necessarily reduce the speed experienced by lower‐priority customers, but this can lead to a better outcome when different customers place different values on speed. We model a single resource (e.g., a manufacturer) that processes jobs from customers who have heterogeneous waiting costs. We analyze the price that maximizes priority revenue for the resource owner (i.e., supplier, manufacturer) under different assumptions regarding customer behavior. We discover that a revenue‐maximizing supplier facing self‐interested customers (i.e., those that independently minimize their own expected costs) charges a price that also minimizes the expected total delay costs across all customers and that this outcome does not result when customers coordinate to submit priority orders at a level that seeks to minimize their aggregate costs of priority fees and delays. Thus, the customers are better off collectively (as is the supplier) when the supplier and customers act independently in their own best interests. Finally, as the number of priority classes increases, both the priority revenues and the overall customer delay costs improve, but at a decreasing rate.
DA - 2009/2//
PY - 2009/2//
DO - 10.1111/j.1540-5915.2008.00217.x
VL - 40
IS - 1
SP - 89-120
SN - 0011-7315
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-61849115209&partnerID=MN8TOARS
KW - Priority Pricing
KW - Queueing Theory
KW - and Supplier-Customer Relationships
ER -
TY - JOUR
TI - Nonstationary analysis of the loss queue and of queueing networks of loss queues
AU - Alnowibet, Khalid Abdulaziz
AU - Perros, Harry
T2 - EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
AB - We present an iterative scheme based on the fixed-point approximation method, for the numerical calculation of the time-dependent mean number of customers and blocking probability functions in a nonstationary queueing network with multi-rate loss queues. We first show how the proposed method can be used to analyze a single-class, multi-class, and multi-rate nonstationary loss queue. Subsequently, the proposed method is extended to the analysis of a nonstationary queueing network of multi-rate loss queues. Comparisons with exact and simulation results showed that the results are consistently close to the exact results and they are always within simulation confidence intervals.
DA - 2009/8/1/
PY - 2009/8/1/
DO - 10.1016/j.ejor.2007.10.066
VL - 196
IS - 3
SP - 1015-1030
SN - 1872-6860
KW - Time-dependent arrival rate
KW - Multi-rate loss queue
KW - Multi-rate network of loss queues
KW - Blocking probability
ER -
TY - JOUR
TI - Electronic Data Interchange: Research Review and Future Directions
AU - Narayanan, Sriram
AU - Marucheck, Ann S.
AU - Handfield, Robert B.
T2 - DECISION SCIENCES
AB - ABSTRACT For nearly two decades, electronic data interchange (EDI) has been widely viewed as a technology pivotal to supply chain management that has also provided benefits to firms on multiple levels. Despite a substantial body of literature, there are a number of conflicting and inconclusive research results in this field. In this study, we synthesize the diverse body of research in EDI by organizing the literature into an initial theoretical framework. Based on a meta‐analysis of results from the empirical literature, we seek to clarify conflicting results from the literature in order to develop a more unified theoretical framework of contextual variables associated with EDI adoption factors and outcomes. From a managerial standpoint, our literature‐based framework offers a set of guidelines for making successful EDI adoption and implementation decisions.
DA - 2009/2//
PY - 2009/2//
DO - 10.1111/j.1540-5915.2008.00218.x
VL - 40
IS - 1
SP - 121-163
SN - 1540-5915
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-61849086828&partnerID=MN8TOARS
KW - Electronic Data Interchange (EDI)
KW - Electronic Linkages
KW - Meta-Analysis
KW - and Supply Chain Collaboration
ER -
TY - JOUR
TI - Technical Note: A Computationally Efficient Algorithm for Undiscounted Markov Decision Processes with Restricted Observations
AU - Davis, Lauren B.
AU - Hodgson, Thom J.
AU - King, Russell E.
AU - Wei, Wenbin
T2 - NAVAL RESEARCH LOGISTICS
AB - Abstract We present a computationally efficient procedure to determine control policies for an infinite horizon Markov Decision process with restricted observations. The optimal policy for the system with restricted observations is a function of the observation process and not the unobservable states of the system. Thus, the policy is stationary with respect to the partitioned state space. The algorithm we propose addresses the undiscounted average cost case. The algorithm combines a local search with a modified version of Howard's (Dynamic programming and Markov processes, MIT Press, Cambridge, MA, 1960) policy iteration method. We demonstrate empirically that the algorithm finds the optimal deterministic policy for over 96% of the problem instances generated. For large scale problem instances, we demonstrate that the average cost associated with the local optimal policy is lower than the average cost associated with an integer rounded policy produced by the algorithm of Serin and Kulkarni Math Methods Oper Res 61 (2005) 311–328. © 2008 Wiley Periodicals, Inc. Naval Research Logistics 2009
DA - 2009/2//
PY - 2009/2//
DO - 10.1002/nav.20329
VL - 56
IS - 1
SP - 86-92
SN - 1520-6750
KW - Markov Decision process
KW - heuristics
KW - optimal control
ER -
TY - JOUR
TI - Query optimization using restructured views: Theory and experiments
AU - Chen, Dongfeng
AU - Chirkova, Rada
AU - Sadri, Fereidoon
T2 - INFORMATION SYSTEMS
AB - We study optimization of relational queries using materialized views, where views may be regular or restructured. In a restructured view, some data from the base table(s) are represented as metadata-that is, schema information, such as table and attribute names-or vice versa. Using restructured views in query optimization opens up a new spectrum of views that were not previously available, and can result in significant additional savings in query-evaluation costs. These savings can be obtained due to a significantly larger set of views to choose from, and may involve reduced table sizes, elimination of self-joins, clustering produced by restructuring, and horizontal partitioning. In this paper we propose a general query-optimization framework that treats regular and restructured views in a uniform manner and is applicable to SQL select-project-join queries and views without or with aggregation. Within the framework we provide (1) algorithms to determine when a view (regular or restructured) is usable in answering a query and (2) algorithms to rewrite queries using usable views. Semantic information, such as knowledge of the key of a view, can be used to further optimize a rewritten query. Within our general query-optimization framework, we develop techniques for determining the key of a (regular or restructured) view, and show how this information can be used to further optimize a rewritten query. It is straightforward to integrate all our algorithms and techniques into standard query-optimization algorithms. Our extensive experimental results illustrate how using restructured views (in addition to regular views) in query optimization can result in a significant reduction in query-processing costs compared to a system that uses only regular views.
DA - 2009/5//
PY - 2009/5//
DO - 10.1016/j.is.2008.10.002
VL - 34
IS - 3
SP - 353-370
SN - 1873-6076
KW - Query optimization
KW - Restructured views
KW - Query optimization using materialized views
ER -
TY - JOUR
TI - Optical burst switching
AU - Murphy, J.
AU - Perros, H.
T2 - IET Communications
DA - 2009///
PY - 2009///
VL - 3
IS - 3
SP - 331-333
ER -
TY - JOUR
TI - On the departure process of burst aggregation algorithms in optical burst switching
AU - Mountrouidou, Xenia
AU - Perros, Harry
T2 - COMPUTER NETWORKS
AB - We characterize analytically the departure process from the following three burst aggregation algorithms: the time based aggregation algorithm, the burst-length based aggregation algorithm and the time and burst-length based aggregation algorithm. The arrival process of packets is assumed to be Poisson or bursty modeled by an Interrupted Poisson Process (IPP). The analytic results are approximate and validation against simulation data showed that they have good accuracy.
DA - 2009/2/27/
PY - 2009/2/27/
DO - 10.1016/j.comnet.2008.09.019
VL - 53
IS - 3
SP - 247-264
SN - 1872-7069
KW - Burst aggregation algorithms
KW - Poisson process
KW - Interrupted Poisson Process
ER -
TY - JOUR
TI - Minimizing a linear fractional function subject to a system of sup-T equations with a continuous Archimedean triangular norm
AU - Li, Pingke
AU - Fang, Shu-Cherng
T2 - JOURNAL OF SYSTEMS SCIENCE & COMPLEXITY
DA - 2009/3//
PY - 2009/3//
DO - 10.1007/s11424-009-9146-x
VL - 22
IS - 1
SP - 49-62
SN - 1559-7067
KW - Fractional optimization
KW - fuzzy relational equations
KW - triangular norms
ER -
TY - JOUR
TI - ESTIMATION AND IDENTIFICATION OF PARAMETERS IN A LUMPED CEREBROVASCULAR MODEL
AU - Pope, Scott R.
AU - Ellwein, Laura M.
AU - Zapata, Cheryl L.
AU - Novak, Vera
AU - Kelley, C. T.
AU - Olufsen, Mette S.
T2 - MATHEMATICAL BIOSCIENCES AND ENGINEERING
AB - This study shows how sensitivity analysis and subset selection can be employed in a cardiovascular model to estimate total systemic resistance, cerebrovascular resistance, arterial compliance, and time for peak systolic ventricular pressure for healthy young and elderly subjects. These quantities are parameters in a simple lumped parameter model that predicts pressure and flow in the systemic circulation. The model is combined with experimental measurements of blood flow velocity from the middle cerebral artery and arterial finger blood pressure. To estimate the model parameters we use nonlinear optimization combined with sensitivity analysis and subset selection. Sensitivity analysis allows us to rank model parameters from the most to the least sensitive with respect to the output states (cerebral blood flow velocity and arterial blood pressure). Subset selection allows us to identify a set of independent candidate parameters that can be estimated given limited data. Analyses of output from both methods allow us to identify five independent sensitive parameters that can be estimated given the data. Results show that with the advance of age total systemic and cerebral resistances increase, that time for peak systolic ventricular pressure is increases, and that arterial compliance is reduced. Thus, the method discussed in this study provides a new methodology to extract clinical markers that cannot easily be assessed noninvasively.
DA - 2009/1//
PY - 2009/1//
DO - 10.3934/mbe.2009.6.93
VL - 6
IS - 1
SP - 93-115
SN - 1551-0018
KW - cardiovascular modeling
KW - systemic resistance
KW - cerebrovascular resistance
KW - parameter estimation
KW - sensitivity analysis
KW - subset selection
ER -
TY - JOUR
TI - Denial of service attacks and defenses in decentralized trust management
AU - Li, Jiangtao
AU - Li, Ninghui
AU - Wang, XiaoFeng
AU - Yu, Ting
T2 - INTERNATIONAL JOURNAL OF INFORMATION SECURITY
AB - Trust management is an approach to scalable and flexible access control in decentralized systems. In trust management, a server often needs to evaluate a chain of credentials submitted by a client; this requires the server to perform multiple expensive digital signature verifications. In this paper, we study low-bandwidth Denial-of-Service (DoS) attacks that exploit the existence of trust management systems to deplete server resources. Although the threat of DoS attacks has been studied for some application-level protocols such as authentication protocols, we show that it is especially destructive for trust management systems. Exploiting the delegation feature in trust management languages, an attacker can forge a long credential chain to force a server to consume a large amount of computing resource. Using game theory as an analytic tool, we demonstrate that unprotected trust management servers will easily fall prey to a witty attacker who moves smartly. We report our empirical study of existing trust management systems, which manifests the gravity of this threat. We also propose a defense technique using credential caching, and show that it is effective in the presence of intelligent attackers.
DA - 2009/4//
PY - 2009/4//
DO - 10.1007/s10207-008-0068-8
VL - 8
IS - 2
SP - 89-101
SN - 1615-5270
KW - Trust management
KW - Denial of service
KW - Access control
KW - Trust negotiation
KW - Game theory
ER -
TY - JOUR
TI - Burst lost probabilities in a queuing network with simultaneous resource possession: a single-node decomposition approach
AU - Battestilli, L.
AU - Perros, H.
AU - Chukova, S.
T2 - IET COMMUNICATIONS
AB - An efficient analytical method is presented for the calculation of blocking probabilities in a tandem queuing network with simultaneous resource possession. This queuing network model is motivated from the need to model optical burst switching networks, where the size of the data bursts varies and the link distance between two adjacent network elements also varies depending on the network's topology. A fast single-node decomposition algorithm is developed to compute the blocking probabilities in the network. The algorithm extends the popular link-decomposition method from teletraffic theory by allowing dynamic simultaneous link possession. Simulation is used to validate the accuracy of the algorithm.
DA - 2009/3//
PY - 2009/3//
DO - 10.1049/iet-com:20070426
VL - 3
IS - 3
SP - 441-453
SN - 1751-8636
ER -
TY - CONF
TI - Analysis and computation for a fluid mixture model
AU - Jiang, Q. L.
AU - Li, Z. L.
AU - Lubkin, S. R.
C2 - 2009///
C3 - Communications in Computational Physics
DA - 2009///
VL - 5
SP - 620-634
M1 - 2-4
ER -
TY - JOUR
TI - An organizational entrepreneurship model of supply management integration and performance outcomes
AU - Handfield, R.
AU - Petersen, K.
AU - Cousins, P.
AU - Lawson, B.
T2 - International Journal of Operations & Production Management
DA - 2009///
PY - 2009///
VL - 29
IS - 1-2
SP - 100-126
ER -
TY - JOUR
TI - A unified mobility model for analysis and simulation of mobile wireless networks
AU - Zhao, Ming
AU - Wang, Wenye
T2 - WIRELESS NETWORKS
DA - 2009/4//
PY - 2009/4//
DO - 10.1007/s11276-007-0055-4
VL - 15
IS - 3
SP - 365-389
SN - 1572-8196
KW - Mobility model
KW - Smooth movement
KW - Semi-Markov process
KW - Stochastic analysis
KW - Network performance evaluation
KW - Mobile wireless networks
ER -
TY - JOUR
TI - Stability criteria for differential-algebraic equations with multiple delays and their numerical solutions
AU - Campbell, Stephen L.
AU - Linh, Vu Hoang
T2 - APPLIED MATHEMATICS AND COMPUTATION
AB - This paper is concerned with the asymptotic stability of differential-algebraic equations with multiple delays and their numerical solutions. First, we give a sufficient condition for delay-independent stability. After characterizing the coefficient matrices that satisfy this stability condition, we propose some practical checkable criteria for asymptotic stability. Then we investigate the stability of numerical solutions obtained by θ-methods and BDF methods. Finally, solvability and stability of a class of weakly regular delay differential-algebraic equations are analyzed.
DA - 2009/2/15/
PY - 2009/2/15/
DO - 10.1016/j.amc.2008.12.008
VL - 208
IS - 2
SP - 397-415
SN - 1873-5649
KW - Delay differential-algebraic equation
KW - Multiple delays
KW - Asymptotic stability
KW - Regular pencil
KW - Numerical solution
ER -
TY - JOUR
TI - Modeling the effect of node synchronization times in ultra-wideband wireless networks
AU - Taggart, Christopher S.
AU - Viniotis, Yannis
AU - Sichitiu, Mihail L.
T2 - PERFORMANCE EVALUATION
AB - Ultra-wideband wireless (UWB) can provide the physical layer for high-throughput personal area networks. When UWB is used for communication between many nodes, relatively long acquisition times are needed when dropping and re-establishing wireless links between the nodes. This paper describes the development and use of mathematical and simulation models to investigate the impact of dropping and reacquiring links between nodes on average packet delay; we also consider the performance of the alternative strategy of forwarding packets through intermediate nodes without breaking the established wireless links. The work presented here assumes that no specific MAC layer protocol, such as WiMedia UWB MAC, is in operation. The paper describes the models, explains the selection of modeling parameters used, compares the average packet delay for a network of three simple UWB nodes and for a ring of ten UWB nodes and explains the use of these results for network design engineers.
DA - 2009/3//
PY - 2009/3//
DO - 10.1016/j.peva.2008.10.008
VL - 66
IS - 3-5
SP - 223-239
SN - 1872-745X
KW - Ultra-wideband
KW - Average delay
KW - Simulation
KW - Servers with vacations
ER -
TY - JOUR
TI - Measuring and partitioning the high-order linkage disequilibrium by multiple order Markov chains (vol 32, pg 301, 2008)
AU - Kim, Y. J.
AU - Feng, S.
AU - Zeng, Z. B.
T2 - Genetic Epidemiology
DA - 2009///
PY - 2009///
VL - 33
IS - 2
SP - 181-181
ER -
TY - JOUR
TI - Knowledge Sharing in Interorganizational Product Development Teams: The Effect of Formal and Informal Socialization Mechanisms
AU - Lawson, Benn
AU - Petersen, Kenneth J.
AU - Cousins, Paul D.
AU - Handfield, Robert B.
T2 - JOURNAL OF PRODUCT INNOVATION MANAGEMENT
AB - Working collaboratively with suppliers is increasingly cited as a “best practice” in product development. The importance of sharing knowledge between buyer and supplier in this context has been well recognized, although comparatively little research exists on the interorganizational socialization mechanisms that facilitate it. The present research proposes and tests a theoretical model of the impact of formal and informal socialization mechanisms on the level of knowledge sharing within interorganizational product development projects and the subsequent effect on buyer firm performance. Results from this study of 111 manufacturing organizations in the United Kingdom largely support its hypotheses. It is revealed that informal socialization mechanisms (e.g., communication guidelines, social events) play an important role in facilitating interorganizational knowledge sharing, whereas formal socialization mechanisms (e.g., cross‐functional teams, matrix reporting structures) act indirectly through informal socialization to influence knowledge sharing. The results also show that interorganizational knowledge sharing is positively associated with supplier contribution to development outcomes, which, in turn, improves buyer product development performance and, ultimately, financial performance. Product development managers are encouraged to build social ties between interorganizational development teams to increase the flow of knowledge and to improve both product development outcomes and financial performance.
DA - 2009/3//
PY - 2009/3//
DO - 10.1111/j.1540-5885.2009.00343.x
VL - 26
IS - 2
SP - 156-172
SN - 0737-6782
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-59349107272&partnerID=MN8TOARS
ER -
TY - JOUR
TI - Identification of protein-coding sequences using the hybridization of 18S rRNA and mRNA during translation
AU - Xing, Chuanhua
AU - Bitzer, Donald L.
AU - Alexander, Winser E.
AU - Vouk, Mladen A.
AU - Stomp, Anne-Marie
T2 - NUCLEIC ACIDS RESEARCH
AB - We introduce a new approach in this article to distinguish protein-coding sequences from non-coding sequences utilizing a period-3, free energy signal that arises from the interactions of the 3′-terminal nucleotides of the 18S rRNA with mRNA. We extracted the special features of the amplitude and the phase of the period-3 signal in protein-coding regions, which is not found in non-coding regions, and used them to distinguish protein-coding sequences from non-coding sequences. We tested on all the experimental genes from Saccharomyces cerevisiae and Schizosaccharomyces pombe . The identification was consistent with the corresponding information from GenBank, and produced better performance compared to existing methods that use a period-3 signal. The primary tests on some fly, mouse and human genes suggests that our method is applicable to higher eukaryotic genes. The tests on pseudogenes indicated that most pseudogenes have no period-3 signal. Some exploration of the 3′-tail of 18S rRNA and pattern analysis of protein-coding sequences supported further our assumption that the 3′-tail of 18S rRNA has a role of synchronization throughout translation elongation process. This, in turn, can be utilized for the identification of protein-coding sequences.
DA - 2009/2//
PY - 2009/2//
DO - 10.1093/nar/gkn917
VL - 37
IS - 2
SP - 591-601
SN - 1362-4962
ER -
TY - JOUR
TI - Combining Trust-Region Techniques and Rosenbrock Methods to Compute Stationary Points
AU - Luo, X. -L.
AU - Kelley, C. T.
AU - Liao, L. -Z.
AU - Tam, H. W.
T2 - JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS
AB - Rosenbrock methods are popular for solving a stiff initial-value problem of ordinary differential equations. One advantage is that there is no need to solve a nonlinear equation at every iteration, as compared with other implicit methods such as backward difference formulas or implicit Runge–Kutta methods. In this article, we introduce a trust-region technique to select the time steps of a second-order Rosenbrock method for a special initial-value problem, namely, a gradient system obtained from an unconstrained optimization problem. The technique is different from the local error approach. Both local and global convergence properties of the new method for solving an equilibrium point of the gradient system are addressed. Finally, some promising numerical results are also presented.
DA - 2009/2//
PY - 2009/2//
DO - 10.1007/s10957-008-9469-0
VL - 140
IS - 2
SP - 265-286
SN - 1573-2878
KW - Trust-region methods
KW - Unconstrained optimization
KW - Rosenbrock method
KW - Gradient system
KW - Ordinary differential equations
ER -
TY - JOUR
TI - Adaptive techniques for the MRAC, adaptive parameter identification, and on-line fault monitoring and accommodation for a class of positive real infinite dimensional systems
AU - Demetriou, Michael A.
AU - Ito, Kazufumi
AU - Smith, Ralph C.
T2 - INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING
AB - Abstract A theoretical framework of the model reference adaptive control design, adaptive parameter identification and automated fault detection is developed for a class of positive real infinite dimensional systems. Uncertain terms are treated as additive perturbations of the plant operator and the framework provides a unified treatment for model reference control, parameter estimation and fault detection and accommodation. For each design problem the well‐posedness and stability of the proposed adaptive scheme are investigated. Extensions to the variable structure observer, to specific forms of the structured perturbation terms and to slowly time‐varying systems are also considered within the proposed framework. Such results are summarized as they capitalize on the proposed well‐posedness and stability results for the general cases. Copyright © 2008 John Wiley & Sons, Ltd.
DA - 2009/2//
PY - 2009/2//
DO - 10.1002/acs.1058
VL - 23
IS - 2
SP - 193-215
SN - 1099-1115
KW - positive real
KW - structured perturbations
KW - infinite dimensional systems
KW - adaptive observers
KW - MRAC
KW - fault detection and accommodation
ER -
TY - JOUR
TI - A Joint Association Test for Multiple SNPs in Genetic Case-Control Studies
AU - Wang, Tao
AU - Jacob, Howard
AU - Ghosh, Soumitra
AU - Wang, Xujing
AU - Zeng, Zhao-Bang
T2 - GENETIC EPIDEMIOLOGY
AB - For a dense set of genetic markers such as single nucleotide polymorphisms (SNPs) on high linkage disequilibrium within a small candidate region, a haplotype-based approach for testing association between a disease phenotype and the set of markers is attractive in reducing the data complexity and increasing the statistical power. However, due to unknown status of the underlying disease variant, a comprehensive association test may require consideration of various combinations of the SNPs, which often leads to severe multiple testing problems. In this paper, we propose a latent variable approach to test for association of multiple tightly linked SNPs in case-control studies. First, we introduce a latent variable into the penetrance model to characterize a putative disease susceptible locus (DSL) that may consist of a marker allele, a haplotype from a subset of the markers, or an allele at a putative locus between the markers. Next, through using of a retrospective likelihood to adjust for the case-control sampling ascertainment and appropriately handle the Hardy-Weinberg equilibrium constraint, we develop an expectation-maximization (EM)-based algorithm to fit the penetrance model and estimate the joint haplotype frequencies of the DSL and markers simultaneously. With the latent variable to describe a flexible role of the DSL, the likelihood ratio statistic can then provide a joint association test for the set of markers without requiring an adjustment for testing of multiple haplotypes. Our simulation results also reveal that the latent variable approach may have improved power under certain scenarios comparing with classical haplotype association methods.
DA - 2009/2//
PY - 2009/2//
DO - 10.1002/gepi.20368
VL - 33
IS - 2
SP - 151-163
SN - 0741-0395
KW - haplotype association
KW - retrospective likelihood
KW - latent variable
KW - logistic mixture model
KW - EM algorithm
ER -
TY - JOUR
TI - Disturbance attenuation by output feedback for linear systems subject to actuator saturation
AU - Wu, Fen
AU - Zheng, Qian
AU - Lin, Zongli
T2 - INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
AB - Abstract In this paper, we study the problem of disturbance attenuation by output feedback for linear systems subject to actuator saturation. A nonlinear output feedback, expressed in the form of a quasi‐linear parameter‐varying system with state‐dependent scheduling parameter, is constructed that leads to the attenuation of the effect of the disturbance on the output of the system. The level of disturbance attenuation is measured in terms of the restricted ℒ︁ 2 gain and the restricted ℒ︁ 2 –ℒ︁ ∞ gain over a class of bounded disturbances. Copyright © 2008 John Wiley & Sons, Ltd.
DA - 2009/1/25/
PY - 2009/1/25/
DO - 10.1002/rnc.1306
VL - 19
IS - 2
SP - 168-184
SN - 1099-1239
KW - nonlinear control
KW - output feedback
KW - disturbance rejection
KW - actuator saturation
KW - L-2 gain
KW - L-2-L-infinity gain
ER -
TY - JOUR
TI - Absolute Protein Quantification by LC/MSE for Global Analysis of Salicylic Acid-induced Plant Protein Secretion Responses
AU - Cheng, Fang-yi
AU - Blackburn, Kevin
AU - Lin, Yu-min
AU - Goshe, Michael B.
AU - Williamson, John D.
T2 - JOURNAL OF PROTEOME RESEARCH
AB - The plant cell wall is a dynamic cellular compartment consisting of a complex matrix of components that can change dramatically in response to environmental stresses. During pathogen attack, for instance, a wide spectrum of proteins that participate in various sequential processes involved in plant defense is secreted into the cell wall. In this study, a mass spectrometry, data-independent acquisition approach known as LC/MS (E) was used to assess temporal changes in the cell wall proteome in response to different levels of an endogenous inducer of plant disease defense responses, salicylic acid (SA). LC/MS (E) was used as a label-free method that enabled simultaneous protein identification and absolute femtomole quantification of each protein secreted into the extracellular matrix. A total of 74 secreted proteins were identified, 63 of which showed increased specific secretion in response to SA. A majority of this induced secretion occurred within 2 h of treatment, indicating that many proteins are involved in the early stages of plant defenses. We also identified a number of apparently nonclassically secreted proteins, suggesting that, as in many nonplant systems, Golgi/ER-independent mechanisms exist for plant protein secretion. These results provide new insight into plant apoplastic defense mechanisms and demonstrate that LC/MS (E) is a powerful tool for obtaining both relative and absolute proteome-scale quantification that can be applied to complex, time- and dose-dependent experimental designs.
DA - 2009/1//
PY - 2009/1//
DO - 10.1021/pr800649s
VL - 8
IS - 1
SP - 82-93
SN - 1535-3907
KW - Arabidopsis
KW - secretome
KW - liquid chromatography
KW - mass spectrometry
KW - MSE
KW - data-independent acquisition
KW - salicylic acid
KW - pathogen
KW - nonclassical protein secretion
ER -
TY - JOUR
TI - The impact of supply chain complexity on manufacturing plant performance
AU - Bozarth, Cecil C.
AU - Warsing, Donald P.
AU - Flynn, Barbara B.
AU - Flynn, E. James
T2 - JOURNAL OF OPERATIONS MANAGEMENT
AB - Abstract This paper puts forth a model of supply chain complexity and empirically tests it using plant‐level data from 209 plants across seven countries. The results show that upstream complexity, internal manufacturing complexity, and downstream complexity all have a negative impact on manufacturing plant performance. Furthermore, supply chain characteristics that drive dynamic complexity are shown to have a greater impact on performance than those that drive only detail complexity. In addition to providing a definition and empirical test of supply chain complexity, the study serves to link the systems complexity literature to the prescriptions found in the flexibility and lean production literatures. Finally, this research establishes a base from which to extend previous work linking operations strategy to organization design [Flynn, B.B., Flynn, E.J., 1999. Information‐processing alternatives for coping with manufacturing environment complexity. Decision Sciences 30 (4), 1021–1052].
DA - 2009/1//
PY - 2009/1//
DO - 10.1016/j.jom.2008.07.003
VL - 27
IS - 1
SP - 78-93
SN - 1873-1317
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-57649108561&partnerID=MN8TOARS
KW - Supply chain complexity
KW - Supply chain management
KW - Manufacturing strategy
KW - Supply management
KW - Empirical research methods
ER -
TY - JOUR
TI - On a semi-smooth Newton method and its globalization
AU - Ito, Kazufumi
AU - Kunisch, Karl
T2 - MATHEMATICAL PROGRAMMING
AB - This paper addresses the globalization of the semi-smooth Newton method for non-smooth equations F(x) = 0 in $${\mathbb{R}}^m$$ with applications to complementarity and discretized ℓ1-regularization problems. Assuming semi-smoothness it is shown that super-linearly convergent Newton methods can be globalized, if appropriate descent directions are used for the merit function |F(x)|2. Special attention is paid to directions obtained from the primal-dual active set strategy.
DA - 2009/5//
PY - 2009/5//
DO - 10.1007/s10107-007-0196-3
VL - 118
IS - 2
SP - 347-370
SN - 1436-4646
ER -
TY - JOUR
TI - Achieving energy conservation in Poisson-Boltzmann molecular dynamics: Accuracy and precision with finite-difference algorithms
AU - Wang, Jun
AU - Cai, Qin
AU - Li, Zhi-Lin
AU - Zhao, Hong-Kai
AU - Luo, Ray
T2 - CHEMICAL PHYSICS LETTERS
AB - Violation of energy conservation in Poisson-Boltzmann molecular dynamics, due to the limited accuracy and precision of numerical methods, is a major bottleneck preventing its wide adoption in biomolecular simulations. We explored the ideas of enforcing interface conditions by the immerse interface method and of removing charge singularity to improve the finite-difference methods. Our analysis of these ideas on an analytical test system shows significant improvement in both energies and forces. Our analysis further indicates the need for more accurate force calculation, especially the boundary force calculation.
DA - 2009/1/22/
PY - 2009/1/22/
DO - 10.1016/j.cplett.2008.12.049
VL - 468
IS - 4-6
SP - 112-118
SN - 1873-4448
ER -
TY - JOUR
TI - Convergence properties of sequential Bayesian D-optimal designs
AU - Roy, Anindya
AU - Ghosal, Subhashis
AU - Rosenberger, William F.
T2 - JOURNAL OF STATISTICAL PLANNING AND INFERENCE
AB - We establish convergence properties of sequential Bayesian optimal designs. In particular, for sequential D-optimality under a general nonlinear location-scale model for binary experiments, we establish posterior consistency, consistency of the design measure, and the asymptotic normality of posterior following the design. We illustrate our results in the context of a particular application in the design of phase I clinical trials, namely a sequential design of Haines et al. [2003. Bayesian optimal designs for phase I clinical trials. Biometrics 59, 591--600] that incorporates an ethical constraint on overdosing.
DA - 2009/2/1/
PY - 2009/2/1/
DO - 10.1016/j.jspi.2008.04.025
VL - 139
IS - 2
SP - 425-440
SN - 1873-1171
KW - Adaptive designs
KW - Asymptotic normality
KW - Discrete optimal design
KW - Dose-response
KW - Posterior convergence
ER -
TY - JOUR
TI - Optimal piecewise-constant signal design for active fault detection
AU - Choe, D.
AU - Campbell, S. L.
AU - Nikoukhah, R.
T2 - INTERNATIONAL JOURNAL OF CONTROL
AB - Recently there has been an increasing interest in active fault detection when traditional approaches are not effective or cannot be used. Previous papers have shown how to construct continuously varying test (auxiliary) signals for use in fault detection and identification. Such signals may not always be easy to implement. In this paper a new algorithm is presented to compute optimal piecewise constant test signals. In the important case where the test signal changes values a small number of times, the new test signals can be both smaller and more effective than test signals computed by other means. Two computational examples are given to illustrate both computational issues and differences between different types of piecewise constant signals.
DA - 2009///
PY - 2009///
DO - 10.1080/00207170801993587
VL - 82
IS - 1
SP - 130-146
SN - 1366-5820
KW - fault detection
KW - active
KW - test signal
KW - optimisation
ER -
TY - JOUR
TI - Area variance estimators for simulation using folded standardized time series
AU - Antonini, Claudia
AU - Alexopoulos, Christos
AU - Goldsman, David
AU - Wilson, James R.
T2 - IIE TRANSACTIONS
AB - We estimate the variance parameter of a stationary simulation-generated process using “folded” versions of standardized time series area estimators. Asymptotically as the sample size increases, different folding levels yield unbiased estimators that are independent scaled chi-squared variates, each with one degree of freedom. This result is exploited to formulate improved variance estimators based on the combination of multiple levels as well as the use of batching. The improved estimators preserve the asymptotic bias properties of their predecessors, but have substantially lower asymptotic variances. The performance of the new variance estimators is demonstrated in a first-order autoregressive process with autoregressive parameter 0.9 and in the queue-waiting-time process for an M/M/1 queue with server utilization 0.8. [Supplementary materials are available for this article. Go to the publisher's online edition of IIE Transactions for the following free supplemental resource: Appendix]
DA - 2009///
PY - 2009///
DO - 10.1080/07408170802331268
VL - 41
IS - 2
SP - 134-144
SN - 1545-8830
KW - Steady-state simulation
KW - simulation output analysis methods
KW - method of standardized time series
KW - batching
KW - variance estimation
ER -