Papers and Conference Presentations

Journal Publications:

• Kong, N., A.J. Schaefer, and B. Hunsaker, “Two-Stage Integer Programs with Stochastic Right-Hand Sides: A Superadditive Dual Approach,” 2006. Mathematical Programming. Vol. 108, pp. 275-296. (pdf)
• Kong, N. and A.J. Schaefer, “A Factor ½ Approximation Algorithm for a Class of Two-Stage Stochastic Mixed-Integer Programs,” 2006. European Journal of Operational Research. Vol. 172, pp. 740-746. (pdf)
• Stahl, J.E., N. Kong, S.M. Shechter, A.J. Schaefer, and M.S. Roberts, “A Methodological Framework for Optimally Re-Organizing Liver Transplant Regions,” 2005. Medical Decision Making. Vol. 25, No. 3, pp. 35-46. (pdf)

• Kong, N., A.J. Schaefer, and S. Ahmed, “Totally Unimodular Stochastic Programs.” Submitted to Mathematical Programming. 2006. Available Online at Optimization Online Digest – May 2006. (pdf)
• Sandikci, B., N. Kong, and A.J. Schaefer, “A Hierarchy of Bounds for Two-Stage Stochastic Mixed-Integer Programs,” 2006. To be submitted to INFORMS Journal on Computing.
• Bayrak, H., M. D. Bailey, and N. Kong, “Static and Dynamic Resource Allocation in Competitive Markov Decision Processes,” 2006. To be submitted to Operations Research.
• Kong, N., A.J. Schaefer, and B. Hunsaker, “A Polyhedral Study for the Pricing Problem in Optimal Region Design,” 2006. To be submitted to Discrete Optimization.

• Kong. N., A.J. Schaefer, B. Hunsaker, and M. Roberts, “Computational Improvement of Integer Programming Models for Determining the Optimal Configuration of Regions in the U.S. Organ Transplantation and Allocation Network,” 2005. Abstract. In Proceedings of the 27^th Society for Medical Decision Making Annual Meeting.
• Kong, N., A.J. Schaefer, B. Hunsaker and M.S. Roberts, “Optimizing Regions for Organ Transplants,” 2004. Extended Abstract. In Proceedings of the 2004 IIE Research Conference. (pdf)
• Kong, N., S.M. Shechter, A.J. Schaefer, and J.E. Stahl, “Organ Transplantation Regions: The Need for Optimization,” 2002. Extended Abstract. In Proceedings of the2002 IIE Research Conference. (pdf)
• Stahl, J.E., N. Kong, Z. Wang, A.J. Schaefer, and G.S. Gazelle, “Organ Transplant Regions – What Is Their Optimal Size and Distribution? A Framework for Analysis,” 2001. Abstract. In Proceedings of the 23^rd Society for Medical Decision Making Annual Meeting, also in Medical Decision Making, vol. 21, No. 6, p. 524.

• “Optimizing the Efficiency of the United States Organ Allocation System through Region Reorganization,” INFORMS 2006 Annual Meeting, Pittsburgh, Pennsylvania, November 5-8, 2006. (Presented in the session “2006 Dantzig Dissertation Finalists”)
• “Maximizing the Efficiency of the U.S. Liver Allocation System through Region Selection,” INFORMS 2006 Annual Meeting, Pittsburgh, Pennsylvania, November 5-8, 2006. (Paper submitted for the 2006 Pierskalla Award)
• “A Hierarchy of Bounds for Two-Stage Stochastic Mixed-Integer Programs,” INFORMS 2006 Annual Meeting, Pittsburgh, Pennsylvania, November 5-8, 2006.
• “Static and Dynamic Resource Allocation for Perimeter Security,” INFORMS 2006 Annual Meeting, Pittsburgh, Pennsylvania, November 5-8, 2006.
• “Simulation-based Optimization Approach for Maximizing Liver Allocation Efficiency,” INFORMS 2006 Annual Meeting, Pittsburgh, Pennsylvania, November 5-8, 2006.
• “Total Unimodular Stochastic Programs,” 19^th International Symposium on Mathematical Programming, Rio de Janeiro, Brazil, July 30 – August 4, 2006. (pdf)
• “Redesigning the Liver Allocation Hierarchy,” 19^th International Symposium on Mathematical Programming, Rio de Janeiro, Brazil, July 30 – August 4, 2006. (pdf)
• “Simulation-based Optimization Approach for Organ Transplantation Region Design.” IERC 2006, Orlando, Florida, May 15 – 19, 2006. (pdf)
• “Polyhedral Study of the Optimal Region Design Problem for Organ Allocation and Transplantation,” INFORMS Optimization Society Conference on Optimization and Health Care 2006, San Antonio, Texas, February, 3-5, 2006. (pdf)
• “Computational Improvement of Integer Programming Models for Determining the Optimal Configuration of Regions in the U.S. Organ Transplantation and Allocation Network,” Society for Medical Decision Making 2005 Annual Meeting, San Francisco, California, October 21 – 24, 2005. (pdf)