Works (34)
Updated: April 4th, 2024 04:36
2023 article
Detecting Human Trafficking: Automated Classification of Online Customer Reviews of Massage Businesses
Li, R., Tobey, M., Mayorga, M. E., Caltagirone, S., & Ozaltin, O. Y. (2023, February 22). M&SOM-MANUFACTURING & SERVICE OPERATIONS MANAGEMENT, Vol. 2.
author keywords: human trafficking; massage businesses; online customer reviews; Natural Language Processing; ensemble learning
TL;DR:
The proposed models can save countless hours in IMB investigations by automatically sorting through large quantities of data to flag potential illicit activity, eliminating the need for manual screening of these reviews by law enforcement and other stakeholders.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality
(Web of Science)
16. Peace, Justice and Strong Institutions
(Web of Science)
Sources: Web Of Science, ORCID
Added: March 20, 2023
2023 journal article
Quantifying association and disparities between diabetes complications and COVID-19 outcomes: A retrospective study using electronic health records
PLOS ONE, 18(9).
TL;DR:
The presence of diabetes complications increases the risks of COVID-19 infection, hospitalization, and worse health outcomes with respect to in-hospital mortality and longer hospital length of stay, and health disparities in CO VID-19 outcomes across demographic groups in the diabetes population are shown.
(via Semantic Scholar)
journals.plos.org (publisher PDF)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(OpenAlex)
Sources: Web Of Science, ORCID
Added: October 30, 2023
2022 article
Coordination of manufacturing and engineering activities during product transitions
Bansal, A., Ozaltin, O. Y., Uzsoy, R., & Kempf, K. G. (2022, April 9). NAVAL RESEARCH LOGISTICS, Vol. 4.
author keywords: combinatorial auctions; integer programming; Product transition; subadditive duality
UN Sustainable Development Goal Categories
9. Industry, Innovation and Infrastructure
(Web of Science)
Sources: Web Of Science, ORCID
Added: April 18, 2022
2022 article
Interpretable models for the automated detection of human trafficking in illicit massage businesses
Tobey, M., Li, R., Ozaltin, O. Y., Mayorga, M. E., & Caltagirone, S. (2022, August 28). IISE TRANSACTIONS, Vol. 8.
author keywords: Human trafficking; illicit massage; interpretable machine learning; risk scores; decision trees
TL;DR:
This work uses findings from primary stakeholder interviews with law enforcement, regulatory bodies, legitimate massage practitioners, and subject-matter experts from nonprofit organizations to identify data sources and potential indicators of illicit massage businesses (IMBs).
(via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality
(Web of Science)
16. Peace, Justice and Strong Institutions
(Web of Science)
Sources: Web Of Science, ORCID
Added: September 26, 2022
2022 article
Managing Product Transitions: A Bilevel Programming Approach
Khorramfar, R., Ozaltin, O. Y., Kempf, K. G., & Uzsoy, R. (2022, June 30). INFORMS JOURNAL ON COMPUTING, Vol. 6, pp. 1–17.
author keywords: product transitions; bilevel programming; constraint and column generation; generalized Nash equilibrium
UN Sustainable Development Goal Categories
10. Reduced Inequalities
(Web of Science)
Sources: Web Of Science, ORCID
Added: July 1, 2022
2022 journal article
Septic shock prediction and knowledge discovery through temporal pattern mining
ARTIFICIAL INTELLIGENCE IN MEDICINE, 132.
author keywords: Temporal pattern mining; Sepsis; Electronic health records; Prediction; Pattern selection
MeSH headings : Critical Care; Electronic Health Records; Humans; Knowledge Discovery; Sepsis / diagnosis; Sepsis / therapy; Shock, Septic / diagnosis; Shock, Septic / therapy
TL;DR:
This framework proposes a framework to find a small number of relevant temporal patterns in electronic health records for the early prediction of septic shock and finds that model-based feature selection approaches PST3 and PST4 yield the best prediction performance among these techniques.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science)
Sources: Web Of Science, ORCID
Added: October 17, 2022
2021 journal article
Mapping of critical events in disease progression through binary classification: Application to amyotrophic lateral sclerosis
JOURNAL OF BIOMEDICAL INFORMATICS, 123.
author keywords: Disease progression; Timing of critical events; Binary classification; Amyotrophic lateral sclerosis; Prognosis; Kaplan-Meier analysis
MeSH headings : Amyotrophic Lateral Sclerosis; Disease Progression; Humans; Prospective Studies; Speech; Walking
TL;DR:
A novel binary classification approach to map scale scores into disease tollgates to describe disease progression leveraging standard/modified Kaplan-Meier analyses is developed and demonstrated by estimating progression pathways in amyotrophic lateral sclerosis.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science)
16. Peace, Justice and Strong Institutions
(OpenAlex)
Sources: Web Of Science, ORCID
Added: November 1, 2021
2021 journal article
Prediction of Sepsis Related Mortality: An Optimization Approach
IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS, 25(11), 4207–4216.
Contributors: J. Agor*, N. Paramita n & O. Ozaltn n
author keywords: Sepsis; SOFA score; optimization; mixed-integer programming; electronic health records
TL;DR:
This study proposes multiple strategies to adjust the SOFA score using mixed-integer programming to improve the in-hospital mortality prediction of septic patients based on Electronic Health Records (EHRs) to take advantage of optimization and data analysis while taking into account the medical expertise.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: November 23, 2021
2020 journal article
Optimal influenza vaccine distribution with equity
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH, 283(2), 714–725.
author keywords: OR in health services; Vaccine distribution; Influenza; Equity
TL;DR:
The proposed model’s ability to consider vaccine coverage inequity is demonstrated and a derivative-free optimization approach is discussed, as an alternative solution method which can consider various different objective functions and constraints.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: March 16, 2020
2020 journal article
Prepositioning disaster relief supplies using robust optimization
IISE TRANSACTIONS, 52(10), 1122–1140.
Contributors: G. Velasquez n, M. Mayorga n & n
author keywords: Humanitarian logistics; inventory prepositioning; disaster relief supply chains; robust optimization
TL;DR:
A case study of the hurricane season in the Southeast US is used to gain insights on the effects of optimization criteria and critical model parameters to relief supply prepositioning strategy.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action
(OpenAlex)
Sources: Web Of Science, ORCID
Added: April 6, 2020
2019 chapter
An embarrassingly parallel method for large-scale stochastic programs
In Springer Optimization and Its Applications (Vol. 149, pp. 127–151).
Contributors: B. Sandıkçı * & n
TL;DR:
This chapter reviews recent developments in solving large-scale stochastic programs, and focuses on a scenario decomposition-based bounding method, which is broadly applicable as it does not rely on special problem structure and stands out as a natural candidate for implementation in a distributed fashion.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions
(OpenAlex)
Source: ORCID
Added: May 6, 2020
2019 conference paper
Evaluating an Emergency Department Care Redesign: A Simulation Approach
Proceedings - Winter Simulation Conference, 2019-December, 1137–1147.
Contributors: B. Swan n, n , S. Hilburn*, E. Gignac * & G. McCammon*
TL;DR:
This paper seeks to compare a pod system against the unit-based design at Southeastern Health’s ED using a discrete event simulation and shows the pod system maintains quality of care metrics while increasing resource utilization, establishing proof of concept that an optimized pod system can improve flow in the ED.
(via Semantic Scholar)
Source: ORCID
Added: May 6, 2020
2019 journal article
Feature selection for classification models via bilevel optimization
COMPUTERS & OPERATIONS RESEARCH, 106, 156–168.
Contributors: J. Agor n & n
author keywords: Feature selection; Classification; Bilevel programming; Cross validation
TL;DR:
The computational experiments show that the proposed bilevel framework improves the overall classification performance while selecting the most important features for the model.
(via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: June 17, 2019
2019 conference paper
The Effect of the Distribution of the Inverse Growth Rate on Pancreatic Cancer Progression
Proceedings - Winter Simulation Conference, 2019-December, 1044–1054.
TL;DR:
It was found that the tumor timeline is about nine months longer under the assumption that the inverse growth rate follows Gamma distribution, while it was inconclusive whether tumor progression is faster or slower in older patients as the tumor progression models with the different underlying assumptions on the inversegrowth rate yielded opposite results.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(OpenAlex)
Source: ORCID
Added: May 6, 2020
2019 journal article
The value of missing information in severity of illness score development
JOURNAL OF BIOMEDICAL INFORMATICS, 97.
author keywords: Severity of illness scores; Sepsis; Missing data; Prediction models; Electronic health records
MeSH headings : Adolescent; Adult; Aged; Aged, 80 and over; Area Under Curve; Computational Biology / methods; Data Interpretation, Statistical; Electronic Health Records / statistics & numerical data; Female; Hospital Mortality; Humans; Intensive Care Units; Logistic Models; Male; Middle Aged; Models, Statistical; Outcome Assessment, Health Care / statistics & numerical data; Sepsis / mortality; Severity of Illness Index; Support Vector Machine; Young Adult
TL;DR:
When developing prediction models using longitudinal EHR data, researchers should explore the incorporation of indicators for missing variables along with appropriate imputation to improve the performance of severity of illness scoring systems.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: April 27, 2020
2019 journal article
Tollgate-based progression pathways of ALS patients
JOURNAL OF NEUROLOGY, 266(3), 755–765.
Contributors: Ö. Dalgıç*, F. Erenay *, K. Pasupathy *, , B. Crum * & M. Sir *
author keywords: ALS progression; Tollgate-based staging system; Phenotypes; Kaplan-Meier analysis
MeSH headings : Adult; Aged; Aged, 80 and over; Amyotrophic Lateral Sclerosis / diagnosis; Amyotrophic Lateral Sclerosis / physiopathology; Disease Progression; Female; Humans; Longitudinal Studies; Male; Medical Records; Middle Aged; Prognosis; Severity of Illness Index; Young Adult
TL;DR:
Using TASS, clinicians can inform ALS patients about their individualized likelihood of having critical disabilities and assistive-device needs (e.g., being dependent on wheelchair/ventilation, needing walker/wheelchair or communication devices), and help them better prepare for future.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science)
4. Quality Education
(OpenAlex)
Sources: Web Of Science, ORCID
Added: March 11, 2019
2018 journal article
Ambulance redeployment and dispatching under uncertainty with personnel workload limitations
IISE TRANSACTIONS, 50(9), 777–788.
Contributors: S. Enayati*, n , M. Mayorga n & C. Saydam n
author keywords: EMS; workload; two-stage stochastic programming; decomposition algorithm
TL;DR:
This work proposes a two-stage stochastic programming model to redeploy and dispatch ambulances to maximize the expected coverage and develops a Lagrangian branch-and-bound algorithm to solve realistic size instances.
(via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2018 review
Models for predicting the evolution of influenza to inform vaccine strain selection
[Review of ]. HUMAN VACCINES & IMMUNOTHERAPEUTICS, 14(3), 678–683.
Contributors: J. Agor n & n
author keywords: influenza evolution; prediction models; influenza vaccine; strain selection; antigenic difference; influenza
MeSH headings : Antigens, Viral / immunology; Humans; Influenza Vaccines / immunology; Influenza, Human / immunology; Influenza, Human / prevention & control; Seasons; World Health Organization
TL;DR:
The literature on state-of-the-art tools and prediction methodologies utilized in modeling the evolution of influenza to inform vaccine strain selection are reviewed and areas that are open for improvement and need further research are discussed.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2018 journal article
On a class of bilevel linear mixed-integer programs in adversarial settings
Journal of Global Optimization, 71(1), 91–113.
Contributors: M. Zare*, n & O. Prokopyev *
author keywords: Bilevel linear mixed-integer programs; Bilevel linear programs; Computational complexity; Strong-weak approach; Pessimistic bilevel programs
TL;DR:
This work considers a class of bilevel linear mixed-integer programs, where the follower’s optimization problem is a linear program, and extends this new modeling approach by considering strong-weak bilevel programs, where the leader is not certain if the follower is collaborative or adversarial, and thus attempts to make a decision by taking into account both cases via a convex combination of the corresponding objective function values.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions
(OpenAlex)
Source: ORCID
Added: May 6, 2020
2018 journal article
Optimal design of the seasonal influenza vaccine with manufacturing autonomy
INFORMS Journal on Computing, 30(2), 371–387.
Contributors: n , O. Prokopyev * & A. Schaefer *
author keywords: influenza vaccine; multistage stochastic mixed-integer programming; bilevel programming; integer programming
TL;DR:
This model integrates the flu shot composition and manufacturing in a stochastic and dynamic environment and derives a branch-and-price algorithm to find the global optimal solution.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science)
Source: ORCID
Added: May 6, 2020
2018 journal article
Optimal production in a competitive market under yield uncertainty
OPTIMIZATION LETTERS, 12(7), 1487–1502.
Contributors: M. Jansen n & n
author keywords: Cournot competition; Yield uncertainty; Capacity constraint; Influenza vaccine market
UN Sustainable Development Goal Categories
12. Responsible Consumption and Production
(Web of Science)
Sources: Web Of Science, ORCID
Added: October 16, 2018
2017 journal article
A SCALABLE BOUNDING METHOD FOR MULTISTAGE STOCHASTIC PROGRAMS
SIAM JOURNAL ON OPTIMIZATION, 27(3), 1772–1800.
author keywords: stochastic programming; multistage; mixed-integer; bounding; parallel computing
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions
(OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2017 journal article
Deriving effective vaccine allocation strategies for pandemic influenza: Comparison of an agent-based simulation and a compartmental model
PLOS ONE, 12(2).
Contributors: Ö. Dalgiç*, , W. Ciccotelli* & F. Erenay *
MeSH headings : Adolescent; Adult; Age Factors; Aged; Child; Child, Preschool; Computer Simulation; Disease Transmission, Infectious / statistics & numerical data; Humans; Infant; Influenza Vaccines / supply & distribution; Influenza, Human / epidemiology; Influenza, Human / prevention & control; Influenza, Human / transmission; Middle Aged; Models, Theoretical; Pandemics / prevention & control; Resource Allocation; Risk; Systems Analysis; Time Factors; Urban Population; Washington; Young Adult
TL;DR:
This work derives age-specific vaccine allocation strategies to mitigate a pandemic influenza outbreak in Seattle by applying derivative-free optimization to an agent-based simulation and also to a compartmental model and compares the strategies derived under various infection aggressiveness and vaccine coverage scenarios.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2017 journal article
Note on Cournot Competition Under Yield Uncertainty
M&SOM-MANUFACTURING & SERVICE OPERATIONS MANAGEMENT, 19(2), 305–308.
Contributors: M. Jansen n & n
author keywords: Cournot competition; random yield; capacity constraints; influenza vaccine market
TL;DR:
A Cournot competition model with asymmetric firms facing capacity constraints and yield uncertainty is formulated, and a threshold structure is shown that shows that society can benefit from supplier diversification under weaker conditions.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
12. Responsible Consumption and Production
(Web of Science)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2017 conference paper
Predicting future states in DotA 2 using value-split models of time series attribute data
ACM International Conference Proceeding Series, Part F130151.
Contributors: Z. Cleghern n, S. Lahiri n, n & D. Roberts n
author keywords: Multiplayer Online Battle Arena (MOBA) Games; Game Analytics; Time Series Analysis; Prediction
TL;DR:
A value-split approach to predicting changes in health is presented and the results of this approach using autoregressive moving-average models for low magnitude health changes and a combination of statistical models for the larger changes are described.
(via Semantic Scholar)
Sources: ORCID, NC State University Libraries
Added: August 6, 2018
2017 conference paper
Simulating triage of patients into an internal medicine department to validate the use of an optimization-based workload score
2017 winter simulation conference (wsc), 2881–2892.
Contributors: J. Agor n, K. McKenzie n, M. Mayorga n , n , R. Parikh* & J. Huddleston *
TL;DR:
A simulation model was used to evaluate a proposed workload score designed to assist in triaging patients into the hospital services of the Division of Hospital Internal Medicine at Mayo Clinic in an effort to more equitably balance workload.
(via Semantic Scholar)
Sources: NC State University Libraries, ORCID
Added: August 6, 2018
2017 journal article
Single-ratio fractional integer programs with stochastic right-hand sides
IISE TRANSACTIONS, 49(6), 579–592.
Contributors: J. Zhang n & n
author keywords: Fractional integer programming; stochastic integer programming; value functions; superadditive duality
TL;DR:
This work presents an equivalent value function reformulation for a class of single-ratio Fractional Integer Programs (FIPs) with stochastic right-hand sides and proposes a two-phase solution approach that can solve instances whose extensive forms have the same order of magnitude as the largest Stochastic quadratic integer programs solved in the literature.
(via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2016 conference paper
Optimal distribution of the influenza vaccine
2016 10th european conference on antennas and propagation (eucap), 2015-January, 1411–1420.
Contributors: n , O. Dalgic & F. Erenay *
TL;DR:
An agent-based stochastic simulation model is used, and the best policy returned by this approach outperforms alternative policies recommended by the Advisory Committee on Immunization Practices and Centers for Disease Control and Prevention.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(OpenAlex)
Sources: NC State University Libraries, ORCID
Added: August 6, 2018
2016 conference paper
Simulation of triaging patients into an internal medicine department to validate the use of an optimization based workload score
2016 winter simulation conference (wsc), 0, 3708–3709.
Contributors: J. Agor n, K. Mckenzie n, n , M. Mayorga n , R. Parikh* & J. Huddleston *
TL;DR:
An overview of the development of a simulation model to be used in the assistance of triaging patients into the Hospital Internal Medicine Department at The Mayo Clinic in Rochester, MN in an effort to balance workload among the department services is provided.
(via Semantic Scholar)
Sources: NC State University Libraries, ORCID
Added: August 6, 2018
2015 journal article
Exact solution approach for a class of nonlinear bilevel knapsack problems
JOURNAL OF GLOBAL OPTIMIZATION, 61(2), 291–310.
Contributors: B. Beheshti*, , M. Zare* & O. Prokopyev *
author keywords: Bilevel programming; Integer programming; Value functions; Knapsack problem
TL;DR:
An exact solution approach is proposed using an equivalent single-level value function reformulation for nonlinear bilevel knapsack problems with quadratic and fractional binary objective functions.
(via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2012 journal article
Two-stage quadratic integer programs with stochastic right-hand sides
Mathematical Programming, 133(1-2), 121–158.
Contributors: * , O. Prokopyev * & A. Schaefer *
author keywords: Stochastic integer programming; Quadratic integer programming; Value functions; Superadditive duality
TL;DR:
This work considers two-stage quadratic integer programs with stochastic right-hand sides, and presents an equivalent reformulation using value functions, which can solve instances whose extensive forms are hundreds of orders of magnitude larger than the largest quadRatic integer programming instances solved in the literature.
(via Semantic Scholar)
Source: ORCID
Added: May 6, 2020
2011 journal article
Optimizing the Societal Benefits of the Annual Influenza Vaccine: A Stochastic Programming Approach
OPERATIONS RESEARCH, 59(5), 1131–1143.
Contributors: * , O. Prokopyev *, A. Schaefer * & M. Roberts *
TL;DR:
This work quantifies the trade-offs involved through a multistage stochastic mixed-integer program that determines the optimal flu shot composition and its timing in a Stochastic and dynamic environment and incorporates risk sensitivity through mean-risk models.
(via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being
(OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018
2011 journal article
Predicting the solution time of branch-and-bound algorithms for mixed-integer programs
INFORMS Journal on Computing, 23(3), 392–403.
Contributors: * , B. Hunsaker* & A. Schaefer *
author keywords: solution time prediction; mixed-integer programming; branch-and-bound algorithm
TL;DR:
A double exponential smoothing technique is proposed to predict the solution time of B&B algorithms and an evaluation method is evaluated using three MIP solvers to show that accurate predictions of the solutionTime are possible, even in the early stages of B &B algorithms.
(via Semantic Scholar)
Source: ORCID
Added: May 6, 2020
2010 journal article
The bilevel knapsack problem with stochastic right-hand sides
Operations Research Letters, 38(4), 328–333.
Contributors: * , O. Prokopyev * & A. Schaefer *
author keywords: Bilevel programming; Stochastic integer programming; Value functions
TL;DR:
The bilevel knapsack problem with stochastic right-hand sides is introduced, and necessary and sufficient conditions for the existence of an optimal solution are provided, and a branch-and-cut algorithm for solving this reformulation is developed.
(via Semantic Scholar)
Source: ORCID
Added: May 6, 2020
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