@article{fukuzawa_mcconnell_kay_thoney-barletta_warsing_2024, title={Implementing trades of the National Football League Draft on blockchain smart contracts}, volume={1}, ISSN={["2515-7841"]}, url={https://doi.org/10.1108/IJSMS-09-2023-0185}, DOI={10.1108/IJSMS-09-2023-0185}, abstractNote={PurposeDemonstrate proof-of-concept for conducting NFL Draft trades on a blockchain network using smart contracts.}, journal={INTERNATIONAL JOURNAL OF SPORTS MARKETING & SPONSORSHIP}, author={Fukuzawa, Mathew B. and McConnell, Brandon M. and Kay, Michael G. and Thoney-Barletta, Kristin A. and Warsing, Donald P.}, year={2024}, month={Jan} }
 @article{nelson_werner_kay_king_mcconnell_thoney-barletta_2023, title={Two-stage stochastic programming model of US Army aviation allocation of utility helicopters to task forces}, volume={11}, ISSN={["1557-380X"]}, url={https://doi.org/10.1177/15485129231209039}, DOI={10.1177/15485129231209039}, abstractNote={ US Army aviation units often organize into task forces to meet mission requirements. The manner in which they allocate assets affects their long-term capabilities to provide aviation support. We propose a model to allocate utility helicopters across geographically separated task forces to minimize the total time of flight and unsupported air movement air mission requests (AMRs) by priority level. We model the allocation problem with a two-stage stochastic program, with the first-stage problem allocating a fleet’s helicopter teams to task forces. The stochastic demand for each task force is then revealed. The second-stage US Army aviation air movement operations planning problem is modeled as a stochastic mixed integer linear program (MILP). A practical application uses the air movement operations planning heuristic to solve the second-stage problem at scale and generate an optimal stochastic solution task force allocation. This paper provides evidence for the practical use of the proposed two-stage stochastic programming model for US Army aviation asset allocation by military decision-makers. Furthermore, this research provides a novel first formulation of a stochastic programming dial-a-ride problem with multinode refuel and a sound framework for military aviation asset allocation decision-making. }, journal={JOURNAL OF DEFENSE MODELING AND SIMULATION-APPLICATIONS METHODOLOGY TECHNOLOGY-JDMS}, author={Nelson, Russell J. and Werner, Jack and Kay, Michael G. and King, Russell E. and McConnell, Brandon M. and Thoney-Barletta, Kristin}, year={2023}, month={Nov} }
 @article{ahmed_heese_kay_2022, title={Designing a manufacturing network with additive manufacturing using stochastic optimisation}, volume={4}, ISSN={["1366-588X"]}, DOI={10.1080/00207543.2022.2056723}, abstractNote={Two of the major problems Traditional Manufacturing (TM) supply chains face are setting requisite reactive strategies to address the uncertainties in demand and the optimal placement of these buffering capacities in order to be both responsive and cost-effective. With Additive Manufacturing (AM) stepping into large-scale production at different firms, we address the aforementioned supply chain dilemmas by considering the potential role of AM in a TM supply chain network where AM facilities can act as a recourse to the TMs and, also, as a dedicated source providing responsive and cost-effective sourcing alternatives. We develop an analytical allocation rule based on cost differentials, which provides optimal sourcing decisions through sequential demand replenishment and facilitates an efficient performance evaluation of possible network configurations. We first model the scenario as a three-stage stochastic optimisation problem. We then solve it using the allocation rule and present an illustration of our analysis and the optimal supply chain network configuration. Furthermore, we derive some insights as to how different problem characteristics affect the value and usage of AM.}, journal={INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH}, author={Ahmed, Ramin and Heese, H. Sebastian and Kay, Michael}, year={2022}, month={Apr} }
 @article{kay_karagul_sahin_gunduz_2021, title={Minimizing Total Logistics Cost for Long-Haul Multi-Stop Truck Transportation}, volume={2676}, ISSN={["2169-4052"]}, url={https://doi.org/10.1177/03611981211041596}, DOI={10.1177/03611981211041596}, abstractNote={ Whenever there is sufficient demand, companies generally prefer the full truckload (TL) option for long-distance transport, resulting in large and less frequent shipment operations that can be costly if inventory carrying costs are high. Less than truckload (LTL) is another option for transport when carrying costs are high and/or there is insufficient demand. Shipment consolidation provides another option that combines many of the benefits of both TL and LTL. Shipment consolidation is a cost-effective transport solution that combines different size shipments into a single truckload. Combining many loads as a single load brings together economies of scale and potential savings. Traditional routing techniques that minimize distance are not suitable for shipments that have different origins and destinations because it can be beneficial to travel further to minimize overall transport and inventory cost, or what is termed total logistics cost (TLC). Effective consolidation of multi-stop routes to minimize TLC requires routing procedures that are more computationally intensive to find beneficial combinations of loads into consolidated shipments. In this study, we have developed a saving-based procedure to determine consolidated route sequences that minimize the TLC of shipments. Twenty-one data sets were produced using real city coordinates and population densities in North Carolina to demonstrate the effectiveness of the procedure. The solutions of the proposed method are compared with the solutions of the traditional Clarke and Wright (C-W) algorithm. Although the traditional C-W algorithm provides very fast solution times, the proposed method has produced much better solution values. }, number={2}, journal={TRANSPORTATION RESEARCH RECORD}, publisher={SAGE Publications}, author={Kay, Michael G. and Karagul, Kenan and Sahin, Yusuf and Gunduz, Gurhan}, year={2021}, month={Sep} }
 @inproceedings{tripathy_ahmed_kay_2021, title={On-Demand Logistics Service for Packages: Package Bidding Mechanism vs. Platform Pricing}, url={http://dx.doi.org/10.1109/wsc52266.2021.9715312}, DOI={10.1109/wsc52266.2021.9715312}, abstractNote={This paper is an exploratory analysis of an on-demand service platform for packages, where the packages bid for transportation service through various auction mechanisms, trucks offer transportation services, and distribution centers match demand and supply. All agents are independent and individually incentivized to participate. Using a utility-based model, we characterize the participation incentives for all the agents, implement the state-of-the-art pricing mechanisms from industry and academia, and design and implement a first-price auction-based mechanism. Using simulation and through performance indicators like throughput, profit of the distribution center, consumer surplus, among others, we find that the package bidding mechanism significantly outperforms the status quo. Furthermore, we extend our analysis to include uniform price and Vickrey-Clarke-Groves auctions. We find that the packages prefer the Vickrey-Clarke-Groves auction, whereas the trucks and distribution centers prefer the first-price auction; although all of them prefer the bidding mechanism to the status-quo pricing mechanism.}, booktitle={2021 Winter Simulation Conference (WSC)}, publisher={IEEE}, author={Tripathy, Manish and Ahmed, Ramin and Kay, Michael}, year={2021}, month={Dec} }
 @article{mcdermott_winz_hodgson_kay_king_mcconnell_2021, title={Performance tradeoffs for spare parts supply chains with additive manufacturing capability servicing intermittent demand}, volume={5}, url={http://dx.doi.org/10.1108/jdal-08-2020-0016}, DOI={10.1108/jdal-08-2020-0016}, abstractNote={PurposeThe study aims to investigate the impact of additive manufacturing (AM) on the performance of a spare parts supply chain with a particular focus on underlying spare part demand patterns.}, number={2}, journal={Journal of Defense Analytics and Logistics}, publisher={Emerald}, author={McDermott, Kyle C. and Winz, Ryan and Hodgson, Thom J. and Kay, Michael G. and King, Russell E. and McConnell, Brandon M.}, year={2021}, month={Dec}, pages={179–213} }
 @article{lynch_hasbrouck_wilck_kay_manogharan_2020, title={Challenges and opportunities to integrate the oldest and newest manufacturing processes: metal casting and additive manufacturing}, volume={26}, ISSN={["1758-7670"]}, DOI={10.1108/RPJ-10-2019-0277}, abstractNote={
Purpose
This paper aims to investigate the current state, technological challenges, economic opportunities and future directions in the growing “indirect” hybrid manufacturing ecosystem, which integrates traditional metal casting with the production of tooling via additive manufacturing (AM) process including three-dimensional sand printing (3DSP) and printed wax patterns.
}, number={6}, journal={RAPID PROTOTYPING JOURNAL}, author={Lynch, Paul and Hasbrouck, Christie and Wilck, Joseph and Kay, Michael and Manogharan, Guha}, year={2020}, pages={1145–1154} }
 @article{peron_fragapane_sgarbossa_kay_2020, title={Digital Facility Layout Planning}, url={https://doi.org/10.3390/su12083349}, DOI={10.3390/su12083349}, abstractNote={In recent years, companies have increased their focus on sustainability to achieve environmental-friendly improvements, to manage pressures from society and regulations, and to attract customers that appreciate sustainability efforts. While companies have mainly aimed short-term/operational improvements, long-term improvements are difficult to reach. One of the fundamental, strategical decision-making processes for a company is facility layout planning. The layout of a facility can have a significant impact on daily operations. Aiming for the goal of sustainability, a dynamic layout decision-making process can support in achieving it. However, the technologies used currently enable only the design of a static layout due to the time-consuming operations involved. In this paper, the introduction of emerging technologies such as 3D mapping, Indoor Positioning System (IPS), Motion Capture System (MoCap), and Immersive Reality (IR) for dynamic layout planning are assessed and discussed. The results obtained clearly demonstrate that the usage of these technologies favor a reconfigurable layout, positively affecting all the three pillars constituting the sustainability concept: the costs involved are reduced, social aspects are improved, and the environment is safeguarded.}, journal={Sustainability}, author={Peron, Mirco and Fragapane, Giuseppe and Sgarbossa, Fabio and Kay, Michael}, year={2020}, month={Apr} }
 @article{kearby_winz_hodgson_kay_king_mcconnell_2020, title={Modeling and transportation planning for US noncombatant evacuation operations in South Korea}, volume={4}, ISSN={2399-6439 2399-6439}, url={http://dx.doi.org/10.1108/JDAL-05-2019-0010}, DOI={10.1108/JDAL-05-2019-0010}, abstractNote={
Purpose
The purpose of this paper is to investigate US noncombatant evacuation operations (NEO) in South Korea and devise planning and management procedures that improve the efficiency of those missions.
}, number={1}, journal={Journal of Defense Analytics and Logistics}, publisher={Emerald}, author={Kearby, John A. and Winz, Ryan D. and Hodgson, Thom J. and Kay, Michael G. and King, Russell E. and McConnell, Brandon M.}, year={2020}, month={Feb}, pages={41–69} }
 @article{strong_kay_wakefield_sirichakwal_conner_manogharan_2020, title={Rethinking reverse logistics: role of additive manufacturing technology in metal remanufacturing}, volume={31}, ISSN={["1758-7786"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85071552161&partnerID=MN8TOARS}, DOI={10.1108/JMTM-04-2018-0119}, abstractNote={PurposeAlthough the adoption of metal additive manufacturing (AM) for production has continuously grown, in-house access to production grade metal AM systems for small and medium enterprises (SMEs) is a major challenge due to costs of acquiring metal AM systems, specifically powder bed fusion AM. On the other hand, AM technology in directed energy deposition (DED) has been evolving in both: processing capabilities and adaptable configuration for integration within existing traditional machines that are available in most SME manufacturing facilities, e.g. computer numerical control (CNC) machining centers. Integrating DED with conventional processes such as machining and grinding into Hybrid AM is well suited for remanufacturing of metal parts. The paper aims to discuss these issues.}, number={1}, journal={JOURNAL OF MANUFACTURING TECHNOLOGY MANAGEMENT}, author={Strong, Danielle and Kay, Michael and Wakefield, Thomas and Sirichakwal, Issariya and Conner, Brett and Manogharan, Guha}, year={2020}, month={Jan}, pages={124–144} }
 @article{mcconnell_hodgson_kay_king_liu_parlier_thoney-barletta_wilson_2019, title={Assessing uncertainty and risk in an expeditionary military logistics network}, volume={7}, ISSN={1548-5129 1557-380X}, url={http://dx.doi.org/10.1177/1548512919860595}, DOI={10.1177/1548512919860595}, abstractNote={ Uncertainty is rampant in military expeditionary operations spanning high-intensity combat to humanitarian operations. These missions require rapid planning and decision-support tools to address the logistical challenges involved in providing support in often austere environments. The US Army’s adoption of an enterprise resource planning system provides an opportunity to develop automated decision-support tools and other analytical models designed to take advantage of newly available logistical data. This research presents a tool that runs in near-real time to assess risk while conducting capacity planning and performance analysis designed for inclusion in a suite of applications dubbed the Military Logistics Network Planning System, which previously only evaluated the mean sample path. Logistical data from combat operations during Operation Iraqi Freedom drive supply requisition forecasts for a contingency scenario in a similar geographic environment. A nonstationary queueing network model is linked with a heuristic logistics scheduling methodology to provide a stochastic framework to account for uncertainty and assess risk. }, number={2}, journal={The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology}, publisher={SAGE Publications}, author={McConnell, Brandon M and Hodgson, Thom J and Kay, Michael G and King, Russell E and Liu, Yunan and Parlier, Greg H and Thoney-Barletta, Kristin and Wilson, James R}, year={2019}, month={Jul}, pages={154851291986059} }
 @article{strong_kay_conner_wakefield_manogharan_2019, title={Hybrid manufacturing-Locating AM hubs using a two-stage facility location approach}, volume={25}, ISSN={["2214-7810"]}, url={https://doi.org/10.1016/j.addma.2018.11.027}, DOI={10.1016/j.addma.2018.11.027}, abstractNote={Hybrid Manufacturing is defined as the integration of Additive Manufacturing (AM), specifically metal AM, with traditional manufacturing post-processing such as heat treatment and machining. Hybrid AM enables Small and Medium Enterprises (SME) who can offer post-processing services to integrate into the growing AM supply chain. Most near-net metal AM parts require heat treatment processes (e.g. residual stress relieving/annealing) before machining to achieve final engineering specification. This research investigates a two-stage facility model to optimize the locations and capacities for new metal AM hubs which require two sequential post-processing services: heat treatment and machining. Using North American Industry Classification System (NAICS) data for machine shops and heat treatment facilities in the U.S., a p-median location model is used to determine the optimal locations for AM hub centers based on: (1) geographical data, (2) demand and (3) fixed and operational costs of hybrid-AM processing. Results from this study have identified: (a) candidate US counties to locate metal AM hubs, (b) total cost (fixed, operational and transportation), (c) capacity utilization of the AM hubs and (d) demand assignments across machine shops – heat treatment facilities – AM hubs. It was found that 2-stage p-Median model identified 22 A M hub locations as the initial sites for AM hubs which grows to 35 A M hubs as demand increases. It was also found that relatively fewer number of heat treatment facilities than machine shops resulted in a more concentrated locations of AM hubs. In addition, transportation costs were not adversely affected by the inclusion of as-build plates and showed that including heat treatment facilities as part of the hybrid AM supply chain will be mutually beneficial to all stakeholders of metal hybrid AM supply chain, i.e. AM → Heat treatment → Machining.}, journal={ADDITIVE MANUFACTURING}, publisher={Elsevier BV}, author={Strong, Danielle and Kay, Michael and Conner, Brett and Wakefield, Thomas and Manogharan, Guha}, year={2019}, month={Jan}, pages={469–476} }
 @article{dayıoğlu_karagül_şahin_kay_2019, title={Route planning methods for a modular warehouse system}, volume={10}, url={https://doi.org/10.11121/ijocta.01.2020.00752}, DOI={10.11121/ijocta.01.2020.00752}, abstractNote={In this study, procedures are presented that can be used to determine the routes of the packages transported within a modular storage system. The problem is a variant of robot motion planning problem.  The structures of the procedures are developed in three steps for the simultaneous movement of multiple unit-sized packages in a modular warehouse.  The proposed heuristic methods consist of route planning, tagging, and main control components. In order to demonstrate the solution performance of the methods, various experiments were conducted with different data sets and the solution times and qualities of the proposed methods were compared with previous studies. It was found that the proposed methods provide better solutions when taking the number of steps and solution time into consideration.}, number={1}, journal={An International Journal of Optimization and Control: Theories & Applications (IJOCTA)}, publisher={International Journal of Optimization and Control: Theories and Applications}, author={Dayıoğlu, Elif G. and Karagül, Kenan and Şahin, Yusuf and Kay, Michael G.}, year={2019}, month={Sep}, pages={17} }
 @inproceedings{vasheghani farahani_chien_king_kay_klenz_2019, title={Time series anomaly detection from a markov chain perspective}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85080858601&partnerID=MN8TOARS}, DOI={10.1109/ICMLA.2019.00170}, abstractNote={This paper introduces a new method for the pattern-wise anomaly detection problem, which aims to find segments whose behaviors are different from the rest of the segments in the time series (as opposed to finding a single data-point in classic anomaly detection problems). An important motivation for studying this problem is to find anomalies whose data-points are within the normal range but they create an unusual pattern. To this end, normal characteristics of the data are found by clustering the overlapping subsequences of the training dataset and analyzing their orders by Markov chains. The trained model is used to assess how well the testing dataset suits the baseline behavior. The designed anomaly detection framework is capable of discovering unusual patterns in both streaming data (online) and stored data (offline). The performance of the methodology is evaluated by applying it to three datasets from different fields: a medical dataset (electrocardiogram), a utility usage dataset, and a New York City taxi demand dataset. The detected anomaly in the medical data agrees with the results of the studies in the literature. A domain expert confirmed the accuracy of the results for the utility usage data, and the anomalies of the New York City taxi demand data referred to major US holidays.}, booktitle={Proceedings - 18th IEEE International Conference on Machine Learning and Applications, ICMLA 2019}, author={Vasheghani Farahani, I. and Chien, A. and King, R.E. and Kay, M.G. and Klenz, B.}, year={2019}, pages={1000–1007} }
 @article{rogers_mcconnell_hodgson_kay_king_parlier_thoney barletta_2018, title={A Military Logistics Network Planning System}, volume={23}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85059779351&partnerID=MN8TOARS}, DOI={10.5711/1082598323405}, number={4}, journal={Military Operations Research}, author={Rogers, Matthew B. and McConnell, Brandon M. and Hodgson, Thom J. and Kay, Michael G. and King, Russell E. and Parlier, Greg and Thoney Barletta, Kristen}, year={2018}, pages={5–24} }
 @article{karagul_kay_tokat_2018, title={A new method for generating initial solutions of capacitated vehicle routing problems}, volume={31}, number={2}, journal={Gazi University Journal of Science}, author={Karagul, K. and Kay, M. G. and Tokat, S.}, year={2018}, pages={489–513} }
 @article{strong_kay_conner_wakefield_manogharan_2018, title={Hybrid manufacturing - integrating traditional manufacturers with additive manufacturing (AM) supply chain}, volume={21}, ISSN={["2214-7810"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85043586298&partnerID=MN8TOARS}, DOI={10.1016/j.addma.2018.03.010}, abstractNote={The ever-growing applications of Additive Manufacturing (AM) in the production of low volume- high value metal parts can be attributed to improving AM processing capabilities and complex design freedom. However, secondary post-processing using traditional processes such as machining, grinding, heat treatment and hot isostatic pressing, i.e., Hybrid Manufacturing, is required to achieve Geometric Dimensioning and Tolerancing (GD&T), surface finish and desired mechanical properties. It is often challenging for most traditional manufacturers to participate in the rapidly evolving supply chain of direct digital manufacturing (DDM) through in-house investments in cost prohibitive metal AM. This research investigates a system of strategically-located AM hubs which can integrate hybrid-AM with the capabilities and excess capacity in multiple traditional manufacturing facilities. Using North American Industry Classification System (NAICS) data for machine shops in the U.S., an uncapacitated facility location model is used to determine the optimal locations for AM hub centers based on: (1) geographical data, (2) demand and (3) cost of hybrid-AM processing. Results from this study have identified: (a) candidate US counties to build AM hubs, (b) total cost (fixed, operational and transportation) and (c) capacity utilization of the AM hubs. It was found that uncapacitated facility location models identified demand centroid as the optimal location and was affected only by AM utilization rate whereas a constrained p-median model identified 22 AM hub locations as the initial sites for AM hubs which grows to 44 AM hubs as demand increases. It was also found that transportation cost was not a significant factor in the hybrid-AM supply chain. Findings from this study will help both AM companies and traditional manufacturers to determine location in the U.S and key factors to advance the metal hybrid-AM supply chain.}, journal={ADDITIVE MANUFACTURING}, author={Strong, Danielle and Kay, Michael and Conner, Brett and Wakefield, Thomas and Manogharan, Guha}, year={2018}, month={May}, pages={159–173} }
 @article{kim_hodgson_king_liu_kay_2017, title={Allocation heuristics for high-altitude long-endurance UAV image intelligence platforms}, volume={22}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85041416039&partnerID=MN8TOARS}, DOI={10.5711/1082598322305}, number={3}, journal={Military Operations Research}, author={Kim, G. and Hodgson, Thom and King, Russell and Liu, Y. and Kay, Michael}, year={2017}, pages={5–19} }
 @article{hanson_hodgson_kay_king_thoney-barletta_2015, title={On the economic lot scheduling problem: stock-out prevention and system feasibility}, volume={53}, ISSN={["1366-588X"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84932193491&partnerID=MN8TOARS}, DOI={10.1080/00207543.2015.1005246}, abstractNote={The Economic Lot Scheduling Problem is a classical scheduling problem with the objective of minimising the long-run inventory and set-up costs of a single machine, multi-product inventory system. Demand rates, production rates and set-up times are assumed to be deterministic. The problem has been extensively studied and methods exist to obtain cyclic schedules which minimise total cost. In order to apply a cyclic schedule without a stock-out occurring, certain initial inventory levels are required. This paper considers the scenario where inventory levels are critically low and the cyclic schedule cannot be applied. Analytical methods are developed to determine: if the initial inventory is sufficient to prevent a stock-out from occurring; the maximum time until a stock-out will occur if a stock-out is unavoidable; and the minimum time required to obtain the necessary inventory to resume the cyclic schedule if a stock-out can be avoided.}, number={16}, journal={INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH}, publisher={Informa UK Limited}, author={Hanson, Brian B. and Hodgson, Thom J. and Kay, Michael G. and King, Russell E. and Thoney-Barletta, Kristin A.}, year={2015}, month={Aug}, pages={4903–4916} }
 @article{tejada_ivy_king_wilson_ballan_kay_diehl_yankaskas_2014, title={Combined DES/SD model of breast cancer screening for older women, II: screening-and-treatment simulation}, volume={46}, ISSN={0740-817X 1545-8830}, url={http://dx.doi.org/10.1080/0740817X.2013.851436}, DOI={10.1080/0740817x.2013.851436}, abstractNote={In the second article of a two-article sequence, the focus is on a simulation model for screening and treatment of breast cancer in U.S. women of age 65+. The first article details a natural-history simulation model of the incidence and progression of untreated breast cancer in a representative simulated population of older U.S. women, which ultimately generates a database of untreated breast cancer histories for individuals in the simulated population. Driven by the resulting database, the screening-and-treatment simulation model is composed of discrete-event simulation (DES) and system dynamics (SD) submodels. For each individual in the simulated population, the DES submodel simulates screening policies and treatment procedures to estimate the resulting survival rates and the costs of screening and treatment. The SD submodel represents the overall structure and operation of the U.S. system for detecting and treating breast cancer. The main results and conclusions are summarized, including a final recommendation for annual screening between ages 65 and 80. A discussion is also presented on how both the natural-history and screening-and-treatment simulations can be used for performance comparisons of proposed screening policies based on overall cost-effectiveness, the numbers of life-years and quality-adjusted life-years saved, and the main components of the total cost incurred by each policy.}, number={7}, journal={IIE Transactions}, publisher={Informa UK Limited}, author={Tejada, Jeremy J. and Ivy, Julie S. and King, Russell E. and Wilson, James R. and Ballan, Matthew J. and Kay, Michael G. and Diehl, Kathleen M. and Yankaskas, Bonnie C.}, year={2014}, month={Mar}, pages={707–727} }
 @inproceedings{wu_kay_king_vila-parrish_warsing_2014, title={Multi-objective optimization of 3D packing problem in additive manufacturing}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84910090427&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Expo 2014}, author={Wu, S. and Kay, M. and King, R. and Vila-Parrish, A. and Warsing, D.}, year={2014}, pages={1485–1494} }
 @inproceedings{tejada_diehl_ivy_wilson_king_ballan_kay_yankaskas_2013, title={Combined DES/SD simulaton model of breast cancer screening for older women: An overview}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84894200756&partnerID=MN8TOARS}, DOI={10.1109/WSC.2013.6721406}, abstractNote={We develop a simulation modeling framework for evaluating the effectiveness of breast cancer screening policies for US women of age 65+. We introduce a two-phase simulation approach to modeling the main components in the breast cancer screening process. The first phase is a natural-history model of the incidence and progression of untreated breast cancer in randomly sampled individuals from the designated population. Combining discrete event simulation (DES) and system dynamics (SD) submodels, the second phase is a screening-and-treatment model that uses information about the genesis of breast cancer in the sampled individuals as generated by the natural-history model to estimate the benefits of different policies for screening the designated population and treating the affected women. Based on extensive simulation-based comparisons of alternative screening policies, we concluded that annual screening from age 65 to age 80 is the best policy for minimizing breast cancer deaths or for maximizing quality-adjusted life-years saved.}, booktitle={Proceedings of the 2013 Winter Simulation Conference - Simulation: Making Decisions in a Complex World, WSC 2013}, author={Tejada, J.J. and Diehl, K. and Ivy, J.S. and Wilson, J.R. and King, R.E. and Ballan, M.J. and Kay, M.G. and Yankaskas, B.C.}, year={2013}, pages={41–53} }
 @article{kefeli_uzsoy_fathi_kay_2011, title={Using a mathematical programming model to examine the marginal price of capacitated resources}, volume={131}, ISSN={["1873-7579"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79952613605&partnerID=MN8TOARS}, DOI={10.1016/j.ijpe.2010.03.018}, abstractNote={Accurate information on dual prices of capacitated resources is of interest in a number of applications, such as cost allocation and pricing. To gain insight we focus on the dual prices of capacity and demand in a single-stage single-product production-inventory system, and discuss their interpretation. In particular, we examine the behavior of two different production planning models: a conventional linear programming model and a nonlinear model that captures queuing behavior at resources in an aggregate manner using nonlinear clearing functions. The classical linear programming formulation consistently underestimates the dual price of capacity due to its failure to capture the effects of queuing. The clearing function formulation, in contrast, produces positive dual prices even when utilization is below one and exhibits more realistic behavior, such as holding finished inventory at utilization levels below one.}, number={1}, journal={INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS}, author={Kefeli, Ali and Uzsoy, Reha and Fathi, Yahya and Kay, Michael}, year={2011}, month={May}, pages={383–391} }
 @inproceedings{kefeli_kay_2010, title={Teaching IE: Common mistakes and reflections on an IE class}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84901037120&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Expo 2010 Proceedings}, author={Kefeli, A. and Kay, M.}, year={2010} }
 @article{kay_warsing_2009, title={Estimating LTL rates using publicly available empirical data}, volume={12}, ISSN={["1469-848X"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-67650902017&partnerID=MN8TOARS}, DOI={10.1080/13675560802392415}, abstractNote={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.}, number={3}, journal={INTERNATIONAL JOURNAL OF LOGISTICS-RESEARCH AND APPLICATIONS}, author={Kay, Michael G. and Warsing, Donald P.}, year={2009}, pages={165–193} }
 @inproceedings{ling_kay_telford_2008, title={Waiting time approximation in public logistics network}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-63849088736&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Expo 2008}, author={Ling, X. and Kay, M.G. and Telford, J.}, year={2008}, pages={543–548} }
 @inproceedings{bucci_kay_warsing_2007, title={A comparison of meta-heuristics for large scale facility location problems with economies of scale}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-44949149427&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Expo 2007 - Industrial Engineering's Critical Role in a Flat World - Conference Proceedings}, author={Bucci, M.J. and Kay, M.G. and Warsing, D.P.}, year={2007}, pages={1410–1415} }
 @inproceedings{ling_kay_telford_2007, title={Public logistics network protocol design and implementation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-44949150426&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Expo 2007 - Industrial Engineering's Critical Role in a Flat World - Conference Proceedings}, author={Ling, X. and Kay, M.G. and Telford, J.}, year={2007}, pages={1593–1598} }
 @inproceedings{bucci_kay_2006, title={A modified ALA procedure for logistic network designs with scale economies}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84858473880&partnerID=MN8TOARS}, booktitle={2006 IIE Annual Conference and Exhibition}, author={Bucci, M.J. and Kay, M.G.}, year={2006} }
 @inproceedings{joines_thoney_kay_2006, title={Supply chain multi-objective simulation optimization}, ISBN={9789077381267}, booktitle={4th International Industrial Simulation Conference 2006 :  ISC'2006 ; June 5 - 7, 2006, Palermo, Italy /}, publisher={Ostend:  EUROSIS-ETI}, author={Joines, J.A. and Thoney, K and Kay, M.G}, year={2006}, pages={125–132} }
 @inproceedings{joines_thoney_king_kay_2006, title={Supply chain multi-objective simulation optimization}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84898422528&partnerID=MN8TOARS}, booktitle={4th International Industrial Simulation Conference 2006, ISC 2006}, author={Joines, J.A. and Thoney, K.A. and King, R.E. and Kay, M.G.}, year={2006}, pages={377–383} }
 @inproceedings{kay_jain_2005, title={Implementing a pricing mechanism for public logistics networks}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33749254634&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Exposition 2005}, author={Kay, M.G. and Jain, A.}, year={2005} }
 @inproceedings{kay_jain_2004, title={Pricing a public logistics network}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-30044432006&partnerID=MN8TOARS}, booktitle={IIE Annual Conference and Exhibition 2004}, author={Kay, M.G. and Jain, A.}, year={2004}, pages={439} }
 @inproceedings{joines_kay_2002, place={Piscataway, New Jersey}, title={2002 hybrid genetic algorithms and random linkage}, volume={2}, ISBN={9780780372825}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4544365780&partnerID=MN8TOARS}, DOI={10.1109/CEC.2002.1004504}, abstractNote={Hybridizing evolutionary algorithms with local search has been quite successful. EAs are designed to exponentially exploit promising regions of the search space; however, by doing so may waste computation effort by duplicating local searches. Therefore, an adaptive memory method is used to determine when to apply a local search.}, booktitle={CEC'02 :  proceedings of the 2002 Congress on Evolutionary Computation : May 12-17, 2002, Hilton Hawaiian Village Hotel, Honolulu, Hawaii}, publisher={IEEE}, author={Joines, J.A. and Kay, M.G.}, year={2002}, pages={1733–1738} }
 @inproceedings{joines_gupta_gokce_king_kay_2002, title={Supply chain multi-objective simulation optimization}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036923655&partnerID=MN8TOARS}, booktitle={Winter Simulation Conference Proceedings}, author={Joines, J.A. and Gupta, D. and Gokce, M.A. and King, R.E. and Kay, M.G.}, year={2002}, pages={1306–1314} }
 @article{joines_kay_king_thomas culbreth_2000, title={A hybrid genetic algorithm for manufacturing cell design}, volume={17}, ISSN={1017-0669 2151-7606}, url={http://dx.doi.org/10.1080/10170669.2000.10432875}, DOI={10.1080/10170669.2000.10432875}, abstractNote={Abstract Global competition is demanding innovative ways of achieving manufacturing flexibility and reduced costs. One approach is through cellular manufacturing, an implementation of the concepts of group technology. The design of a cellular manufacturing system requires that a part population be at least minimally described by its use of process technology (padmachine incidence matrix) and partitioned into part families and that the associated plant equipment be partitioned into machine cells. At the highest level, the objective is to form a set of completely autonomous units such that inter-cell movement of parts is minimized. This paper presents a stochastic global optimization technique utilizing genetic algorithms (GAS) and local improvement procedures (LIPs) to solve the cell design problem. The combination of LIPs with GAS is shown to improve the performance of the GA in terms of solution quality and computational efficiency. Several different methods of incorporating these procedures into the GA are investigated. The concepts used in these hybrid techniques can easily be extended to other variations of the cell design problem as well as to other LIPs.}, number={5}, journal={Journal of the Chinese Institute of Industrial Engineers}, publisher={Informa UK Limited}, author={Joines, Jeffrey A. and Kay, Michael G. and King, Russell E. and Thomas Culbreth, C.}, year={2000}, month={Sep}, pages={549–564} }
 @article{joines_houck_kay_2000, title={Characterizing search spaces for tabu search and including adaptive memory into a genetic algorithm}, volume={17}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84869042285&partnerID=MN8TOARS}, DOI={10.1080/10170669.2000.10432873}, abstractNote={Abstract A large number of heuristic search algorithms are available for function optimization. Each of these heuristics, e.g., simulated annealing, genetic algorithms, tabu search, etc., has been shown to be effective at finding good solutions efficiently. However, little work has been directed at determining what are the important problem characteristics for which one algorithm is more efficient than the others. By examining two problems, the location-allocation problem and the quadratic assignment problem, characteristics of successfil tabu search are illustrated. A tabu search for the location-allocation problem is described and implemented. The results of this tabu search are compared against a genetic algorithm. For the quadratic assignment problem, tabu search has been shown more effective than genetic algorithms; however, for the location-allocation problem, the genetic algorithm finds better solutions more efficiently than tabu search. To. investigate what characteristics of the location-allocation problem makes it less amenable to tabu search, a comparison between the location-allocation problem and the quadratic assignment problem is performed. A comparison of the problem characteristics reveals that the location-allocation problem has very large basins of attraction around a few local optima. For tabu search to escape these minima requires a large number of iterations. Finally, a combination of both tabu search and genetic algorithms is presented for the location-allocation problem, where regions around genetically determined sample points are marked as tabu. This combination (i.e., adpative memory) compares favorably to the genetic algorithm in terms of increased computational efficiency.}, number={5}, journal={Journal of the Chinese Institute of Industrial Engineers}, publisher={Informa UK Limited}, author={Joines, Jeffrey A. and Houck, Christopher R. and Kay, Michael G.}, year={2000}, pages={527–536} }
 @article{hodgson_kay_mittal_tang_1999, title={Evaluation of cylindricity using combinatorics}, volume={31}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85023862738&partnerID=MN8TOARS}, DOI={10.1080/07408179908969804}, abstractNote={Several numerical methods have been developed for finding the minimum zone of a cylinder. This paper presents a combinatorial method termed the Minimum Shell for cylindricity evaluation. For a given set of measured data points, the method efficiently searches for the six points that determine the minimum zone of cylindricity. This method is self-contained, without the requirement of mathematical programming software support, and is equal to or superior to other methods of evaluating cylindricity in terms of accuracy, efficiency, and simplicity. Computational results are given.}, number={1}, journal={IIE Transactions}, author={Hodgson, Thom and Kay, Michael and Mittal, R. O. and Tang, S. Y.}, year={1999}, pages={39–47} }
 @article{hodgson_kay_mittal_tang_1999, title={Evaluation of cylindricity using combinatorics}, volume={31}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0032637123&partnerID=MN8TOARS}, DOI={10.1023/A:1007572617551}, abstractNote={Several numerical methods have been developed for finding the minimum zone of a cylinder. This paper presents a combinatorial method termed the Minimum Shell for cylindricity evaluation. For a given set of measured data points, the method efficiently searches for the six points that determine the minimum zone of cylindricity. This method is self-contained, without the requirement of mathematical programming software support, and is equal to or superior to other methods of evaluating cylindricity in terms of accuracy, efficiency, and simplicity. Computational results are given.}, number={1}, journal={IIE Transactions (Institute of Industrial Engineers)}, author={Hodgson, T.J. and Kay, M.G. and Mittal, R.O. and Tang, S.-Y.I.}, year={1999}, pages={39–47} }
 @article{seifert_kay_wilson_1998, title={Evaluation of AGV routeing strategies using hierarchical simulation}, volume={36}, ISSN={["0020-7543"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0032121916&partnerID=MN8TOARS}, DOI={10.1080/002075498193057}, abstractNote={To analyse an automated guided vehicle (AGV) system operating under selected vehicle routeing strategies, we present a simulation model that can handle an arbitrary system layout as well as arbitrary numbers of AGVs and pedestrians causing congestion in the system. We introduce a dynamic vehicle routeing strategy based on hierarchical simulation that operates as follows: at the time of each AGV routeing decision in the main simulation, subordinate simulations are performed to evaluate a limited set of alternative routes in succession until the current routeing decision can be finalized and the main simulation resumed. A case study involving a prototype AGV system operating under the control of a global vision system illustrates the advantages not only of this strategy but also of global-vision-based control.}, number={7}, journal={INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH}, author={Seifert, RW and Kay, MG and Wilson, JR}, year={1998}, month={Jul}, pages={1961–1976} }
 @inproceedings{janet_white_kay_sutton_brickley_1998, title={Fusing a hyper-ellipsoid clustering Kohonen network with the Julier-Uhlmann-Kalman filter for autonomous mobile robot map building and tracking}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031637149&partnerID=MN8TOARS}, DOI={10.1109/ROBOT.1998.677301}, abstractNote={We fuse a self-organizing hyperellipsoid clustering (HEC) Kohonen neural network with the Julier-Uhlmann-Kalman filter (JUKF) to perform map building and low-level position estimation. The HEC Kohonen uses the Mahalanobis distance to learn elongated shapes (typical of sonar data) and obtain a stochastic measurement of data-node association. The number of nodes is regulated by measuring how well a node model matches its associated data. The HEC Kohonen can handle high-dimensional problems and can be generalized to other pattern recognition problems. The JUKF compliments the HEC Kohonen in that it performs low-level (nonlinear) tracking more efficiently and more accurately than the extended Kalman filter. By estimating and propagating error covariances through system transformations, the JUKF eliminates the need to derive Jacobian matrices. The inclusion of stochastic information inherent to the HEC map renders the JUKF an excellent tool for our HEC-based map building, position estimation, motion planning and low-level tracking.}, booktitle={Proceedings - IEEE International Conference on Robotics and Automation}, author={Janet, J.A. and White, M.W. and Kay, M.G. and Sutton, J.C. and Brickley, J.J.}, year={1998}, pages={1405–1410} }
 @article{sargent_kay_sargent_1997, title={A methodology for optimally designing console panels for use by a single operator}, volume={39}, ISSN={["0018-7208"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031410945&partnerID=MN8TOARS}, DOI={10.1518/001872097778827052}, abstractNote={ A seven-step methodology is presented to determine a dimensionally correct optimal layout of a console panel for a single operator. This methodology integrates the steps in the layout design process and uses a mathematical optimization model from facility design to obtain the optimal panel layout. A major difference in this methodology from previous work is that the mathematical optimization model incorporates factors that are only partially included in previous mathematical models. In addition, it includes the areas of the panel components as a new factor. This methodology is illustrated by the design of a nuclear power plant console panel. }, number={3}, journal={HUMAN FACTORS}, author={Sargent, TA and Kay, MG and Sargent, RG}, year={1997}, month={Sep}, pages={389–409} }
 @article{janét_luo_kay_1997, title={Autonomous mobile robot global motion planning and geometric beacon collection using traversability vectors}, volume={13}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031077257&partnerID=MN8TOARS}, DOI={10.1109/70.554354}, abstractNote={Approaches in global motion planning (GMP) and geometric beacon collection (for self-localization) using traversability vectors have been developed and implemented in both computer simulation and actual experiments on mobile robots. Both approaches are based on the same simple, modular, and multifunctional traversability vector (t-vector). Through implementation it has been found that t-vectors reduce the computational requirements to detect path obstructions, Euclidean optimal via-points, and geometric beacons, as well as to identify which features are visible to sensors. Environments can be static or dynamic and polygons are permitted to overlap (i.e., intersect or be nested). While the t-vector model does require that polygons be convex, it is a much simpler matter to decompose concave polygons into convex polygon sets than it is to require that polygons not overlap, which is required for many other GMP models. T-vectors also reduce the data size and complexity of standard V-graphs and variations thereof. This paper presents the t-vector model so that the reader can apply it to mobile robot GMP and self-localization.}, number={1}, journal={IEEE Transactions on Robotics and Automation}, author={Janét, J.A. and Luo, R.C. and Kay, M.G.}, year={1997}, pages={132–140} }
 @article{houck_joines_kay_wilson_1997, title={Empirical Investigation of the Benefits of Partial Lamarckianism}, volume={5}, ISSN={["1530-9304"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031082512&partnerID=MN8TOARS}, DOI={10.1162/evco.1997.5.1.31}, abstractNote={ Genetic algorithms (GAs) are very efficient at exploring the entire search space; however, they are relatively poor at finding the precise local optimal solution in the region in which the algorithm converges. Hybrid GAs are the combination of improvement procedures, which are good at finding local optima, and GAs. There are two basic strategies for using hybrid GAs. In the first, Lamarckian learning, the genetic representation is updated to match the solution found by the improvement procedure. In the second, Baldwinian learning, improvement procedures are used to change the fitness landscape, but the solution that is found is not encoded back into the genetic string. This paper examines the issue of using partial Lamarckianism (i.e., the updating of the genetic representation for only a percentage of the individuals), as compared to pure Lamarckian and pure Baldwinian learning in hybrid GAs. Multiple instances of five bounded nonlinear problems, the location-allocation problem, and the cell formation problem were used as test problems in an empirical investigation. Neither a pure Lamarckian nor a pure Baldwinian search strategy was found to consistently lead to quicker convergence of the GA to the best known solution for the series of test problems. Based on a minimax criterion (i.e., minimizing the worst case performance across all test problem instances), the 20% and 40% partial Lamarckianism search strategies yielded the best mixture of solution quality and computational efficiency. }, number={1}, journal={EVOLUTIONARY COMPUTATION}, publisher={MIT Press - Journals}, author={Houck, Christopher R. and Joines, Jeffery A. and Kay, Michael G. and Wilson, James R.}, year={1997}, pages={31–60} }
 @inproceedings{goodridge_kay_luo_1997, title={Multi-layered fuzzy behavior fusion for reactive control of an autonomous mobile robot}, volume={1}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030660961&partnerID=MN8TOARS}, booktitle={IEEE International Conference on Fuzzy Systems}, author={Goodridge, Steven G. and Kay, Michael G. and Luo, Ren C.}, year={1997}, pages={579–584} }
 @article{houck_joines_kay_1996, title={Comparison of genetic algorithms, random restart, and two-opt switching for solving large location-allocation problems}, volume={23}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030168535&partnerID=MN8TOARS}, DOI={10.1016/0305-0548(95)00063-1}, abstractNote={This paper examines the application of a genetic algorithm used in conjunction with a local improvement procedure for solving the location-allocation problem, a traditional multifacility location problem. This problem is difficult to solve using traditional optimization techniques because of its multimodal, nonconvex nature. The alternate location-allocation (ALA) method has been shown to be an effective local improvement procedure for the location-allocation problem. Using the ALA method, an empirical analysis was done to determine the number and size of the local minima of the location-allocation problem to demonstrate the reduction of the size of the search space that can be achieved through the use of the ALA method as an evaluator. A genetic algorithm that evaluates a series of ALA solutions was developed and compared to two traditional heuristic procedures for the problem: random restart and H4, a two-opt procedure. Like the genetic algorithm, both procedures evaluate a series of ALA solutions. A statistical analysis of the quality of the solutions provided by the three procedures for several problems of varying size demonstrated that the genetic algorithm provides the best solutions. An examination of the number of ALA evaluations performed by each procedure showed that the genetic algorithm also found solutions to the larger size problems much quicker than either the random restart or the H4 procedures.}, number={6}, journal={Computers & Operations Research}, publisher={Elsevier BV}, author={Houck, C. R. and Joines, J. A. and Kay, M. G.}, year={1996}, pages={587–596} }
 @article{goodridge_kay_luo_1996, title={Multilayered fuzzy behavior fusion for real-time reactive control of systems with multiple sensors}, volume={43}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030172088&partnerID=MN8TOARS}, DOI={10.1109/41.499811}, abstractNote={Fuzzy linguistic rules provide an intuitive and powerful means for defining control behavior. Most applications that use fuzzy control feature a single layer of fuzzy inference, mapping a function from one or two inputs to equally few outputs. Highly complex systems, with large numbers of inputs, may also benefit from the use of qualitative linguistic rules if the control task is properly partitioned. This paper presents a modular fuzzy control architecture and inference engine that can be used to control complex systems. The control function is broken down into multiple local agents, each of which samples a subset of a large sensor input space. Additional fuzzy agents are employed to fuse the recommendations of the local agents. Real-time implementation without special hardware is possible by using singleton output values during fuzzy rule evaluation. A development tool is used to translate a fuzzy programming language offline for fast execution at run time. Using this system, a multilayered fuzzy behavior fusion based reactive control system has been implemented on an autonomous mobile robot, MARGE, with great success. MARGE won first place in Event III of the 1993 Robot Competition sponsored by the American Association for Artificial Intelligence.}, number={3}, journal={IEEE Transactions on Industrial Electronics}, author={Goodridge, S.G. and Kay, M.G. and Luo, R.C.}, year={1996}, pages={387–394} }
 @inproceedings{goodridge_kay_1996, title={Multimedia sensor fusion for intelligent camera control}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030411519&partnerID=MN8TOARS}, booktitle={IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems}, author={Goodridge, Steven G. and Kay, Michael G.}, year={1996}, pages={655–662} }
 @inproceedings{janet_gutierrez-osuna_kay_luo_1995, title={Autonomous mobile robot self-referencing with sensor windows and neural networks}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029541847&partnerID=MN8TOARS}, booktitle={IECON Proceedings (Industrial Electronics Conference)}, author={Janet, Jason A. and Gutierrez-Osuna, Ricardo and Kay, Michael G. and Luo, Ren C.}, year={1995}, pages={1124–1129} }
 @inproceedings{janet_luo_kay_1995, title={Essential visibility graph: an approach to global motion planning for autonomous mobile robots}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029178169&partnerID=MN8TOARS}, DOI={10.1109/ROBOT.1995.526023}, abstractNote={An approach to global motion planning for autonomous mobile robots has been developed on the basis of traversability vectors (t-vectors). Through the overall course of this research it was found that t-vectors provide a utility, efficiency and mathematical stability for collision detection and visibility that cannot be matched by commonly used algebraic approaches in static and dynamic environments. This paper will show that t-vectors also impact global motion planning by identifying redundancies in visibility graphs (V-graphs) and expediting their construction. The result of eliminating redundant path segments is a streamlined version of the V-graph called the essential visibility graph (EVG). This paper will also show that the EVG offers a significant reduction in data storage requirements and complexity.}, booktitle={Proceedings - IEEE International Conference on Robotics and Automation}, author={Janet, Jason A. and Luo, Ren C. and Kay, Michael G.}, year={1995}, pages={1958–1963} }
 @inproceedings{seifert_kay_1995, title={Evaluation of AGV routing strategies using hierarchical simulation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029504766&partnerID=MN8TOARS}, booktitle={Winter Simulation Conference Proceedings}, author={Seifert, Ralf W. and Kay, Michael G.}, year={1995}, pages={850–856} }
 @article{sargent_kay_1995, title={Implementation and utilization of a decentralized storage system: Costing model}, volume={15}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-3543050090&partnerID=MN8TOARS}, DOI={10.1108/EUM0000000003958}, abstractNote={Companies using just‐in‐time principles are currently moving from
centralized to decentralized storage areas. A question that needs to be
addressed is whether this move is cost efficient. Presents a costing
model which can be used to determine if further consideration should be
given to decentralized storage in a facility currently utilizing
centralized storage. Evaluates whether the savings in material handling
flow costs associated with moving from centralized to decentralized
storage outweighs the additional costs associated with implementing and
utilizing decentralized storage for a designated period of time. Through
the process of solving the cost model, a new layout will be created for
the decentralized storage system. The layout includes the placement of
the additional material storage and receipt areas as well as the
rearrangement of the other departments in the facility.}, number={9}, journal={International Journal of Operations and Production Management}, author={Sargent, T.A. and Kay, M.G.}, year={1995}, pages={210–219} }
 @inproceedings{janet_luo_kay_1994, title={Autonomous mobile robot motion planning enhanced with extended configuration-space and half-planes}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028753404&partnerID=MN8TOARS}, booktitle={IECON Proceedings (Industrial Electronics Conference)}, author={Janet, Jason A. and Luo, Ren C. and Kay, Michael G.}, year={1994}, pages={1088–1093} }
 @inproceedings{luo_kay_lee_1994, title={Future trends in multisensor integration and fusion}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028756683&partnerID=MN8TOARS}, booktitle={IEEE International Symposium on Industrial Electronics}, author={Luo, Ren C. and Kay, Michael G. and Lee, W.Gary}, year={1994}, pages={7–12} }
 @inproceedings{goodridge_luo_kay_1994, title={Multi-layered fuzzy behavior fusion for real-time control of systems with many sensors}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028699308&partnerID=MN8TOARS}, booktitle={IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems}, author={Goodridge, Steven G. and Luo, Ren C. and Kay, Michael G.}, year={1994}, pages={272–279} }
 @inproceedings{kay_luo_1993, title={Global vision for the control of free-ranging AGV systems}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0027229864&partnerID=MN8TOARS}, booktitle={Proceedings - IEEE International Conference on Robotics and Automation}, author={Kay, Michael G. and Luo, Ren C.}, year={1993}, pages={14–19} }
 @inproceedings{janet_luo_aras_kay_1993, title={Sonar windows and geometrically represented objects for mobile robot self-referencing}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0027834340&partnerID=MN8TOARS}, author={Janet, Jason A. and Luo, Ren C. and Aras, Caglan M. and Kay, Michael G.}, year={1993}, pages={1324–1331} }
 @inproceedings{kay_luo_1992, title={Camera Placement for Global Vision}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84935410564&partnerID=MN8TOARS}, DOI={10.1109/IROS.1992.594502}, abstractNote={Stationary visual cameras, or what is termed "global vision," can be used to provide the information necessary for the control of multiple free-ranging auto- matic guided vehicles in order to expand the range of applications for which they are a high-performance and cost-effective transport alternative. The camera placement problem of global vision refers to determining, for a given facility layout, a minimal number of cameras necessary to implement global vision-based control and their positions in the facility. In this paper, the camera placement prob- lem of global vision is formulated and analyzed for its computational complexity and is shown to be NP-hard, and a convex hull-based greedy algorithm is described for its approximate solution. I. INTRODUCTION Stationary visual cameras, or what is termed "global vision," can be used to provide the information necessary for the control of free-ranging automatic guided vehicle (AGV) systems. Global vision provides a means to robustly control AGV systems composed of large numbers of low-cost free- ranging vehicles that are able to operate in unrestricted indoor environments. The sensory information used for the control of the free-ranging AGV system is provided by global vision and low-cost range sensors on board each vehicle. A system with these capabilities will expand the range of applications for which they are a high-performance and cost-effective material transport alternative. The development of a means to achieve these capabilities was the principal motivation for proposing global vision-based free-ranging AGV control (3). Global vision refers to the use of cameras placed at fixed locations in a workspace to extend the local sensing available on board each vehicle in a free-ranging AGV system. Information from the cameras is used to (a) monitor the workspace to detect and track potential obstacles both in the immediate vicinity of each AGV and over its intended path; (b) track each AGV along its intended path to bound errors in the vehicle's dead-reckoning sensors; (c) monitor the load aboard each AGV to detect positioning errors; and, as a side benefit, (d) provide video images of the entire workspace so that a human operator can monitor the status of operations throughout the facility. Figure 1 shows the major components of global vision- based AGV control. The cameras for global vision are placed at fixed locations throughout a facility. Their unprocessed video signals are sent both to TV screens, where they could be used to monitor the status of on-going operations, and to a central processing site, where global vision-based vehicle control takes place. The status of the AGV system is available as input to high-level transport control functions (e.g., vehicle dispatching). Although only two cameras are shown in the figure, more cameras would typically be used in practice. Each vehicle has a communications link with the central pro- cessing site to receive control commands and to transmit the results of its on-board sensing operations. A. Limitations of Current AGV Systems}, booktitle={IEEE International Conference on Intelligent Robots and Systems}, author={Kay, M.G. and Luo, R.C.}, year={1992}, pages={917–924} }
 @inproceedings{kay_luo_1992, title={Selection of sensor-based free-ranging AGV systems}, volume={1992-August}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85067682601&partnerID=MN8TOARS}, DOI={10.1109/ETFA.1992.683250}, booktitle={IEEE International Conference on Emerging Technologies and Factory Automation, ETFA}, author={Kay, M.G. and Luo, R.C.}, year={1992}, pages={184–189} }
 @inproceedings{luo_kay_1991, title={Hierarchical target representation for autonomous recognition using distributed sensors}, volume={1383}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0025795487&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Luo, Ren C. and Kay, Michael G.}, year={1991}, pages={537–544} }
 @inproceedings{luo_kay_1990, title={A tutorial on multisensor integration and fusion}, volume={1}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0025574877&partnerID=MN8TOARS}, booktitle={IECON Proceedings (Industrial Electronics Conference)}, author={Luo, Ren C. and Kay, Michael G.}, year={1990}, pages={707–722} }
 @article{luo_kay_1989, title={Multisensor integration and fusion in intelligent systems}, volume={19}, url={http://dx.doi.org/10.1109/21.44007}, DOI={10.1109/21.44007}, abstractNote={The issues involved in integrating multiple sensors into the operation of a system are presented in the context of the type of information these sensors can uniquely provide. A survey is provided of the variety of approaches to the problem of multisensor integration and fusion that have appeared in the literature in recent years ranging from general paradigms, frameworks, and methods for integrating and fusing multisensory information to existing multisensor systems used in different areas of application. General multisensor fusion methods, sensor selection strategies, and world models are examined, along with approaches to the integration and fusion of information from combinations of different types of sensors. Short descriptions of the role of multisensor integration and fusion in the operation of a number of existing mobile robots are provided, together with proposed high-level multisensory representations suitable for mobile robot navigation and control. Existing multisensor systems for industrial and other applications are considered. >}, number={5}, journal={IEEE Transactions on Systems, Man, and Cybernetics}, publisher={Institute of Electrical and Electronics Engineers (IEEE)}, author={Luo, R.C. and Kay, M.G.}, year={1989}, pages={901–931} }
 @article{fisher_farber_kay_1988, title={Mathes: An expert system for material handling equipment selection}, volume={14}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0024126215&partnerID=MN8TOARS}, DOI={10.1016/0167-188X(88)90034-1}, abstractNote={This paper describes a rule-based expert system, MATHES (MATerial Handling Equipment Selection), that selects appropriate types of material handling equipment for intra-factory moves of unitized material. The equipment types are chosen by applying heuristic selection rules (acquired from a human expert) to responses from a user concerning relevant details about the characteristics of a material move. The heuristic rules relate characteristics of the move to appropriate types of material handling equipment. Associated with each selected equipment type is a factor that can be used to order the list of selected equipment as to each type's degree of appropriateness.}, number={4}, journal={Engineering Costs and Production Economics}, author={Fisher, E.L. and Farber, J.B. and Kay, M.G.}, year={1988}, pages={297–310} }
 @article{luo_kay_1988, title={Multisensor integration and fusion: ISSUES and approaches}, volume={931}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0009416130&partnerID=MN8TOARS}, DOI={10.1117/12.946646}, abstractNote={Issues concerning the effective integration of multiple sensors into the operation of intelligent systems are presented, and a description of some of the general paradigms and methodologies that address this problem is given. Multisensor integration, and the related notion of multisensor fusion, are defined and distinguished. The potential advantages and problems resulting from the integration of information from multiple sensors are discussed.}, journal={Proceedings of SPIE - The International Society for Optical Engineering}, author={Luo, R.C. and Kay, M.G.}, year={1988}, pages={42–49} }
 @inproceedings{luo_kay_1988, title={Multisensor integration and fusion: Issues and approaches}, volume={931}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85075321925&partnerID=MN8TOARS}, DOI={10.1117/12.946647}, abstractNote={This paper presents a survey of the issues and methods for the association and fusion of data from multiple sensors. It will cover three broad areas. The first, data association, refers to the problem of partitioning the sensor data into tracks according to source. We next discuss the techniques used for kinematic and attribute estimation after data association has been performed. In particular, we will discuss the philosophies associated with alternative techniques for attribute and target type estimation, with an emphasis upon the Dempster-Shafer approach. The third major topic discussed is sensor allocation.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Luo, R.C. and Kay, M.G.}, year={1988}, pages={42–49} }
 @inproceedings{luo_kay_1988, title={The role of multisensory integration and fusion in the operation of mobile robots}, volume={1988-October}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84991953564&partnerID=MN8TOARS}, DOI={10.1109/IROS.1988.593287}, booktitle={IEEE International Conference on Intelligent Robots and Systems}, author={Luo, R.C. and Kay, M.G.}, year={1988}, pages={259–264} }