Associate Chair for Graduate Studies and
Kiplinger Faculty Fellow and
Professor
Education
- Ph.D. Operations Research (1988), University of North Carolina at Chapel Hill
- B.S. Mathematics (1982), Aristotle University of Thessaloniki, Greece
Expertise
- Simulation
- Stochastic Processes
About
Christos Alexopoulos is the Associate Chair for Graduate Studies, Kiplinger Faculty Fellow, and Professor in the H. Milton Stewart School of Industrial and Systems Engineering at Georgia Tech.
Research
Dr. Alexopoulos' research interests center on applied probability, simulation analysis methodology, statistics, and optimization under uncertainty. His recent work involves
- the design and implementation of efficient sequential methods for estimating measures of risk and error in simulation experiments and
- optimization of production and inventory systems using machine learning methods.
Teaching
Dr. Alexopoulos has been a core contributor to simulation education in ISyE since 1988. In 1999 he co-founded, with Richard Fujimoto and others, the cross-disciplinary Modeling & Simulation Research & Education Center, which served as a springboard for the creation of the School of Computational Science and Engineering (CSE) with 12 home units across the Institute. Dr. Alexopoulos has served as ISyE's unit coordinator for the graduate programs in CSE since their inception. In addition to instruction, he has co-developed instructional games as well as the Sequest Software for estimating measures of statistical risk and error.
Awards and Honors
- Best Paper Award in Operations Engineering and Analysis of IIE Transactions 2010
- Best Paper Award, 24th ACM/IEEE/SCS Workshop on Principles of Advanced and Distributed Simulation (PADS) 2010
- INFORMS Simulation Society Outstanding Simulation Publication Award 2007
Representative Publications
Liu, X., Alexopoulos, C., Han, S., Hu, H., Peng, Y., and Qi, Y. “A Simulation-Driven Machine Learning Framework for Large-Scale Inventory Management,” Annals of Operations Research, 2025, DOI.
Lolos, A., Boone J. H., Alexopoulos, C., Goldsman, D., Dingeç K. D., Wilson, J. R., and Mokashi, A. “STSTS: A Sequential Method for Estimating Steady-State Quantiles Using Standardized Time Series,” Journal of Simulation, vol. 18, no. 6, 988–1010, 2024, DOI.
Lolos, A., Alexopoulos, C., Goldsman, D., Dingeç K. D., Mokashi, A., and Wilson, J. R. “A Fixed Sample-Size Method for Estimating Steady-State Quantiles,” Proceedings of the 2023 Winter Simulation Conference Proceedings of the 2023 Winter Simulation Conference, 457–468, IEEE, Piscataway, New Jersey, 2023.
Alexopoulos, C., Goldsman, D., Mokashi, A. C., Tien K.-W., and Wilson, J. R., “Sequest: A Sequential Procedure for Estimating Quantiles in Steady-State Simulations,” Operations Research, vol. 67, no. 4, 1162–1183, 2019.
Alexopoulos, C., Goldsman, D., Mokashi, A. C., and Wilson, J. R., “Automated Simulation-Based Estimation of Extreme Steady-State Quantiles via the Maximum Transformation,” ACM Transactions on Modeling and Computer Simulation, vol. 27, no. 4, Article 22, 2017.
Meterelliyioz, M., Alexopoulos, C., Goldsman, D., and Aktaran-Kalaycı, T., “Reflected Variance Estimators for Simulation,” IIE Transactions, vol. 47, no. 11, pp. 1185–1202, 2015. Honorable Mention in IIE Transactions Focused Issue on Operations Engineering & Analytics Best Paper Award Competition for 2017.
Huang, Y.-L., Alexopoulos, C., Fujimoto, R. M., and Hunter, M. P., “Ad Hoc Distributed Simulation of Queueing Networks,” 24th ACM/IEEE/SCS Workshop on Principles of Advanced and Distributed Simulation (PADS 2010), 57–64, Atlanta, Georgia, 2010. Winner of Best Paper Award.
Lee, J., Alexopoulos, C., Goldsman D., Kim, S.-H., Tsui, K.-L., and Wilson J. R., “Monitoring Autocorrelated Processes Using a Distribution-free Tabular CUSUM Chart with Automated Variance Estimation,” IIE Transactions, vol. 41, no. 11, pp. 979–994, 2009.
Antonini, C., Alexopoulos, C., Goldsman, D., and Wilson, J. R., “Area Variance Estimators for Simulation Using Folded Standardized Time Series,” IIE Transactions, vol. 41, no. 2, pp. 134–144, 2008. Winner of 2010 Best Paper Award in Operations Engineering and Analysis of IIE Transactions.
Alexopoulos, C., Argon, N. T., Goldsman, D., Steiger, N. M., Tokol, G., and Wilson, J. R., “Efficient Computation of Overlapping Variance Estimators for Simulation,” INFORMS Journal on Computing, vol. 19, no. 3, pp. 314–327, 2007.
Alexopoulos, C., Argon, N. T., Goldsman, D., Tokol, G., and Wilson, J. R., “Overlapping Variance Estimators for Simulation,” Operations Research, vol. 55, no. 6, pp. 1090–1103, 2007.
Kim, S.-H., Alexopoulos, C., Tsui, K.-L., and Wilson, J. R., “A Distribution-free Tabular CUSUM Chart for Autocorrelated Data,” IIE Transactions, vol. 39, no. 3, pp. 317–330, 2007.
Alexopoulos, C. and Goldsman, D., “To Batch or Not to Batch?,” ACM Transactions on Modeling and Computer Simulation, vol. 14, 76–114, 2004. Winner of INFORMS Simulation Society 2007 Outstanding Simulation Publication Award.