Optimizing Sponsored Humanitarian Parole

Published on October 30, 2023

Alex Teytelboym, Ryan Killea, Fatemeh Farajzadeh, A. C. Trapp, "Optimizing Sponsored Humanitarian Parole," ACM Conference on Equity and Access in Algorithms, Mechanisms, and Optimization (EAAMO), 2023.

DiversiTree: A New Method to Efficiently Compute Diverse Sets of Near-Optimal Solutions to Mixed-Integer Optimization Problems

Published on June 29, 2023

Izuwa Ahanor, Hugh Medal, A. C. Trapp, "DiversiTree: A New Method to Efficiently Compute Diverse Sets of Near-Optimal Solutions to Mixed-Integer Optimization Problems," accepted, INFORMS Journal of Computing, 2023.

Select, Route and Schedule: Optimizing Community Paramedicine Service Delivery with Mandatory Visits and Patient Prioritization

Published on May 26, 2023

Shima Azizi, Özge Aygül, Brenton Faber, Sharon Johnson, Renata Konrad, A. C. Trapp, "Select, Route and Schedule: Optimizing Community Paramedicine Service Delivery with Mandatory Visits and Patient Prioritization," accepted, Health Care Management Science, 2023.

Dynamic Placement in Refugee Resettlement

Published on March 16, 2023

Narges Ahani, Paul Gölz, Ariel Procaccia, Alexander Teytelboym, A. C. Trapp, "Dynamic Placement in Refugee Resettlement," accepted, Operations Research, 2023.

A Reformulation Technique to Solve Polynomial Optimization Problems with Separable Objective Functions of Bounded Integer Variables

Published on January 30, 2023

Pitchaya Wiratchotisatian, A. C. Trapp, "A Reformulation Technique to Solve Polynomial Optimization Problems with Separable Objective Functions of Bounded Integer Variables," accepted, Optimization Letters, 2023.

Estimating Effectiveness of Identifying Human Trafficking via Data Envelopment Analysis

Published on December 21, 2022

Geri L. Dimas, Malak El Khalkhali, Alex Bender, Kayse Lee Maass, Renata A. Konrad, Jeff Blom, Joe Zhu, A. C. Trapp, "Estimating Effectiveness of Identifying Human Trafficking via Data Envelopment Analysis," accepted, INFORMS Journal on Applied Analytics, 2022.

Perspectives on How To Conduct Responsible Anti-Human Trafficking Research in Operations and Analytics

Published on December 19, 2022

Renata A. Konrad, Kayse Lee Maass, Geri L. Dimas, A. C. Trapp, "Perspectives on How To Conduct Responsible Anti-Human Trafficking Research in Operations and Analytics," European Journal of Operational Research, 2023.

Improving Access to Housing and Supportive Services for Runaway and Homeless Youth: Reducing Vulnerability to Human Trafficking in New York City

Published on October 12, 2022

Yaren Bilge Kaya, Kayse Lee Maass, Renata A. Konrad, A. C. Trapp, Geri L. Dimas, Meredith Dank, "Improving access to housing and supportive services for runaway and homeless youth: Reducing vulnerability to human trafficking in New York City," available online, IISE Transactions, 2022.

Stability Representations of Many-to-One Matching Problems: An Integer Optimization Approach

Published on September 30, 2022

P. Wiratchotisatian, H. Atef Yekta, A. C. Trapp, "Stability Representations of Many-to-One Matching Problems: An Integer Optimization Approach," available online, INFORMS Journal on Computing, 2022.

Operations Research and Analytics to Combat Human Trafficking: A Systematic Review of Academic Literature

Published on August 29, 2022

Geri L. Dimas, Kayse Lee Maass, Renata A. Konrad, A. C. Trapp, "Operations research and analytics to combat human trafficking: A systematic review of academic literature," available online, PLOS One, 2022.

Dynamic Placement in Refugee Resettlement

Published on July 18, 2021

Narges Ahani, Paul Gölz, Ariel Procaccia, Alexander Teytelboym, A. C. Trapp, "Dynamic Placement in Refugee Resettlement," available online, EC '21: Proceedings of the 22nd ACM Conference on Economics and Computation, 2021.

Aid Allocation for Camp-Based and Urban Refugees with Uncertain Demand and Replenishments

Published on June 30, 2021

Shima Azizi, Cem Deniz Caglar Bozkir, O. Erhun Kundakcıoğlu, A. C. Trapp, Ali Kaan Kurbanzade, "Aid Allocation for Camp-Based and Urban Refugees with Uncertain Demand and Replenishments," available online, Production and Operations Management, 2021.

Placement Optimization in Refugee Resettlement

Published on March 24, 2021

Narges Ahani, Tommy Andersson, Alessandro Martinello, Alexander Teytelboym, A. C. Trapp, "Placement Optimization in Refugee Resettlement," available online, Operations Research, 2021.

Maritime Container Shipping: Does Coopetition Improve Cost and Environmental Efficiencies?

Published on August 26, 2020

A. C. Trapp, Irina Harris, Vasco Sanchez Rodrigues, Joe Sarkis, "Maritime Container Shipping: Does Coopetition Improve Cost and Environmental Efficiencies?," available online, Transportation Research Part D, 2020.

Outlier-Aware, Density-Based Gaze Fixation Identification

Published on June 30, 2020

W. Liu, A. C. Trapp, S. Djamasbi, "Outlier-Aware, Density-Based Gaze Fixation Identification," available online, Omega, 2020.

Closing the Loop: Forging High-Quality Agile Virtual Enterprises in a Reverse Supply Chain via Solution Portfolios

Published on May 12, 2020

A. C. Trapp, R. A. Konrad, J. Sarkis, A. Z. Zeng, ""Closing the Loop: Forging High-Quality Agile Virtual Enterprises in a Reverse Supply Chain via Solution Portfolios," available online, Journal of the Operational Research Society, 2020.

Globally Optimal Model-based Clustering via Mixed Integer Nonlinear Programming

Published on December 14, 2019

P. Flaherty, Pitchaya Wiratchotisatian, Andrew C. Trapp, "Globally Optimal Model-based Clustering via Mixed Integer Nonlinear Programming", NeurIPS 2019 Workshop on Sets & Partitions, pp. 1-10.

Optimizing Placement of Residential Shelters for Human Trafficking Survivors

Published on August 3, 2019

K. Maass, A. C. Trapp, R. A. Konrad, "Optimizing Placement of Residential Shelters for Human Trafficking Survivors," accepted for publication, Socio-Economic Planning Sciences, 2019.

A Global Optimization Algorithm for Sparse Mixed Membership Matrix Factorization

Published on July 9, 2019

F. Zhang, C. Wang, A. C. Trapp, P. Flaherty, A Global Optimization Algorithm for Sparse Mixed Membership Matrix Factorization, New Advances in Statistics and Data Science, ICSA Book Series in Statistics, Springer, pp. 129-156, 2019

Scalable User-Substation Assignment with Big Data from Power Grids

Published on June 1, 2019

B. Lyu, Y. Li, J. Fu, A. C. Trapp, H. Xi, Y. Liao, "Scalable User-Substation Assignment with Big Data from Power Grids," IEEE Transactions on Big Data, 5(2), pp. 209-222, 2019.

Identifying Fixations in Gaze Data via Inner-Density and Optimization

Published on April 26, 2019

A. C. Trapp, W. Liu, S. Djamasbi, "Identifying Fixations in Gaze Data via Inner-Density and Optimization," INFORMS Journal on Computing, 31(3), pp. 459-476, 2019.

Enriching Solutions to Combinatorial Problems via Solution Engineering

Published on April 22, 2019

T. Petit, A. C. Trapp, "Enriching Solutions to Combinatorial Problems via Solution Engineering," INFORMS Journal on Computing, 31(3), pp. 429-444, 2019.

Detecting task demand via an eye tracking machine learning system

Published on January, 2019

M. Shojaiezadeh, S. Djamasbi, R. Paffenroth, A. C.Trapp, "Detecting Task Demand via an Eye Tracking Machine Learning System," Decision Support Systems, Vol. 116, pp. 91-101, 2019.

Measuring Focused Attention Using Fixation Inner-Density

Published on June 3, 2018

Wen Liu, Mina Shojaeizadeh, Soussan Djamasbi, Andrew C. Trapp, "Measuring Focused Attention Using Fixation Inner-Density", International Conference on Augmented Cognition AC 2018: Augmented Cognition: Users and Contexts pp 105-116

Overcoming human trafficking via operations research and analytics: Opportunities for methods, models, and applications

Published on June 1, 2017

R. A. Konrad, A. C. Trapp, T. Palmbach, J. S. Blom, "Overcoming Human Trafficking via Operations Research and Analytics: Opportunities for Methods, Models, and Applications," European Journal of Operational Research, Vol. 259 (2), pp. 733-745, 2017.

Creating a Decision Support System for Service Classification and Assignment through Optimization

August 10, 2017

C. Chagnon, A.C. Trapp, S. Djamasbi, "Creating a Decision Support System for Service Classification and Assignment through Optimization," Americas Conference on Information Systems (AMCIS) 2017, Boston, MA, 2017.

A Deterministic Global Optimization Method for Variational Inference

December 5, 2016

H. Saddiki, A.C. Trapp, P. Flaherty, "A Deterministic Global Optimization Method for Variational Inference," Advances in Approximate Bayesian Inference, NIPS 2016 Workshop, Barcelona, Spain, 2016.

Scalable User Assignment in Power Grids: A Data Driven Approach

October 31, 2016

B. Lyu, S. Li, Y. Li, J. Fu, A. C. Trapp, H. Xie, Y. Liao, "Scalable User Assignment in Power Grids: A Data Driven Approach," ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, San Francisco, CA, 2016.

Recovering all generalized order-preserving submatrices: new exact formulations and algorithms

Published on March 25, 2016

A. C. Trapp, C. Li, P. Flaherty, "Recovering All Generalized Order-Preserving Submatrices: New Exact Formulations and Algorithms," Annals of Operations Research, Vol. 263 (1-2), pp. 385-404, 2018.

An analysis of patient portal utilization: what can we learn about online patient behavior by examining portal click data?

Published on March, 2016

B. Tulu, A. C. Trapp, M. Hoque, D. M. Strong, S. A. Johnson, L. Garber, J. Trudel, "An Analysis of Patient Portal Utilization: What Can We Learn about Online Patient Behavior by Examining Portal Click Data?," Health Systems, Vol. 5 (1), pp. 66-79, 2016.

Identifying Robust portfolios of suppliers: a sustainability selection and development perspective

Published on January 20, 2016

A. C. Trapp, J. Sarkis, "Identifying Robust Portfolios of Suppliers: A Sustainability Selection and Development Perspective," Journal of Cleaner Production, Vol. 112 (3), pp. 2088-2100, 2016.

Finding Diverse Solutions of High Quality to Constraint Optimization Problems

July 25, 2015

T. Petit, A. C. Trapp, "Finding Diverse Solutions of High Quality to Constraint Optimization Problems," International Joint Conference on Artificial Intelligence (IJCAI), Buenos Aires, Argentina, 2015. [Invited Oral (Long Talk) and Poster Presentation; Acceptance Rate 28.8% (575/1,996)]

Finding diverse optima and near-optima to binary integer programs

Published on June 26, 2015

A. C. Trapp, R. A. Konrad, "Finding Diverse Optima and Near-Optima to Binary Integer Programs," IIE Transactions, Vol. 47 (11), pp. 1300-1312, 2015.

Examining the impact of regular physician visits on heart failure patients: a use case with electronic health data

Published on October 30, 2015

Brenton Faber, R. A. Konrad, C. Tang, A. C. Trapp, "Examining the Impact of Regular Physician Visits on Heart Failure Patients: A Use Case with Electronic Health Data," Health Systems, Vol. 5 (2), pp. 132-139, 2016.

Analyzing the impact of in-rack sprinklers in a warehouse fire: A demonstration of the role optimization has in mitigating damage

Published on April, 2015

A. C. Trapp, A. S. Rangwala, "Analyzing the Impact of In-rack Sprinklers in a Warehouse Fire: A Demonstration of the Role Optimization Has in Mitigating Damage," Fire Safety Journal, Vol. 73, pp. 55-62, 2015.

A note on constraint aggregation and value functions for two-stage stochastic integer programs

Published on February, 2015

A. C. Trapp, O. A. Prokopyev, "A Note on Constraint Aggregation and Value Functions for Two-Stage Stochastic Integer Programs," Discrete Optimization, Vol. 15, pp. 37-45, 2015.

The provision of mental health treatment after screening: exploring the relationship between treatment setting and treatment intensity

Published on November–December, 2014

B. Shiner, C. Tang, A. C. Trapp, R. Konrad, I. Bar-On, B. V. Watts, "The Provision of Mental Health Treatment After Screening: Exploring the Relationship Between Treatment Setting and Treatment Intensity," General Hospital Psychiatry, Vol. 36 (6), pp. 581-588, 2014.

On a Level-Set Characterization of the Value Function of an Integer Program and Its Application to Stochastic Programming

Published on March 19, 2013

A. C. Trapp, O. A. Prokopyev, A. J. Schaefer, "On a Level-Set Characterization of the Value Function of an Integer Program and Its Application to Stochastic Programming," Operations Research, Vol. 61 (2), pp. 498-511, 2013.

• Link to RANDOMRHS-2013 data sets.

Thermoacoustic heat engine modeling and design optimization

Published on October, 2011

A. C. Trapp, F. Zink, O. A. Prokopyev, L. Schaefer, "Thermoacoustic Heat Engine Modeling and Optimization," Applied Thermal Engineering, Vol. 31 (14-15), pp. 2518-2528, 2011.

Optimization of minimum set of protein–DNA interactions: a quasi exact solution with minimum over-fitting

Published on February 1, 2010

N. Temiz, A. Trapp, O. Prokopyev, C. J. Camacho, "Optimization of Minimum Set of Protein-DNA Interactions: a Quasi Exact Solution with Minimum Over-fitting," Bioinformatics, Vol. 26 (3), pp. 319-325, 2010.

Finding checkerboard patterns via fractional 0–1 programming

Published on February 1, 2010

A. Trapp, O. A. Prokopyev, S. Busygin, "Finding Checkerboard Patterns via Fractional 0-1 Programming," Journal of Combinatorial Optimization, Vol. 20 (1), pp. 1-26, 2010.

Checking solvability of systems of interval linear equations and inequalities via mixed integer programming

Published on November 16, 2009

O. A. Prokopyev, S. Butenko, A. Trapp, "Checking Solvability of Systems of Interval Linear Equations and Inequalities via Mixed Integer Programming," European Journal of Operational Research, Vol. 199 (1), pp. 117-121, 2009.

Solving the Order-Preserving Submatrix Problem via Integer Programming

Published on October 21, 2009

A. C. Trapp, O. A. Prokopyev, "Solving the Order-Preserving Submatrix Problem via Integer Programming," INFORMS Journal on Computing, Vol. 22 (3), pp. 387-400, 2010.

• Finalist, Student Paper Competition, INFORMS Data Mining Section, Austin, TX