Stephen D. Patek Associate Professor Systems and Information Engineering School of Engineering and Applied Science University of Virginia Contact Information: PO Box 400747 151 Engineers Way Charlottesville, VA 22904 Phone: 434-982-2052 Fax: 434-982-2972 E-mail: patek AT virginia DOT edu Affiliations: Optimization and Control Group Coordination Systems Research Group Wireless Internet Center for Advanced Technology (WICAT) NLM T-15 Training Grant Program: Systems Engineering Focus on Medical Informatics UVA Diabetes Technology Center Research Interests: Stochastic Optimization, Control, and Games Diabetes Technology and Health Systems Models Network Traffic Engineering

Stochastic Optimization, Control, and Games (selected):

• S. D. Patek and D. P. Bertsekas, “Stochastic Shortest Path Games,” SIAM Journal on Control and Optimization, 37(3):804-824, 1999
• S. D. Patek. On Terminating Markov Decision Processes with a Risk Averse Objective Function. Automatica, 37(9):1379–1386, 2001.
• E. Campos-Nanez and S. D. Patek. Dynamically Identifying Regenerative Cycles in Simulation-Based Optimization Algorithms for Markov Chains. IEEE Trans Automatic Control, 49(6):1022–1025, 2004.
• S. D. Patek. Policy iteration type algorithms for recurrent state Markov decision processes. Computers and Operations Research, 31(14):2333–2347, 2004.
• S. D. Patek. Partially Observed Stochastic Shortest Path Problems with Approximate Solution by Neuro-Dynamic Programming. IEEE Transactions on Systems, Man, and Cybernetics Part A, 37(9):710-720, 2007.
• Garcia, S. D. Patek, and K. Sinha, “A Decentralized Approach for Discrete Optimization via Simulation: Application to Network Flow,” Operations Research, 55(4):717-732, 2007.
• S. D. Patek, P. A. Beling, and Y. Zhao, “Natural Solutions for a Class of Symmetric Games,” Game Theoretic and Decision Theoretic Agents, AAAI Spring Symposium Technical Report SS-07-02, pp. 47-53, 2007.
• Y. Zhao, S. D. Patek, and P. A. Beling, “Decentralized Bayesian Search using Approximate Dynamic Programming Methods,” IEEE Transactions on Systems, Man, and Cybernetics, 38(4):970-975, 2008.

Diabetes Technology and Health Systems Models (selected):

• S. D. Patek, M. Breton, C. Dalla Man, C. Cobelli, B. Kovatchev, “Adaptive Meal Detection Algorithm for Enhancing Closed-Loop Control in Type 1 Diabetes,” Abstract in the Diabetes Technology Meeting, 2007.
• Y. Chen, M. D. Breton, B. P. Kovatchev, and S. D. Patek, “Closed Loop LQG Control of Blood Glucose with Subcutaneous Continuous Glucose Monitoring and Insulin Infusion: In-silico Comparison to PID,” Abstract in the Diabetes Technology Meeting, 2007.
• S. D. Patek, M. Breton, Y. Chen, C. Solomon, and B. P. Kovatchev, “Linear Quadratic Gaussian-Based Closed-Loop Control of Type 1 Diabetes,” Journal of Diabetes Science Technology, 2007:1(16):834-841.
• B. Kovatchev, M. Breton, S. Patek, C. Cobelli, “In Silico Testing and In Vivo Experiments with Closed Loop Control of Blood Glucose in Diabetes,” IFAC World Congress, 2008.
• L. Magni, D. M. Raimondo, C. Dalla Man, M. Breton, S. Patek, G. De Nicolao, C. Cobelli, B. P. Kovatchev, “Evaluating the Efficacy of Closed-Loop Glucose Regulation via Control Variability Grid Analysis,” Journal of Diabetes Science and Technology, 2(4):630-635, 2008.
• S. D. Patek, M. Breton, B. P, Kovatchev, “Rollout Policies for Control of Blood Glucose,” Extended abstract in the Latin-Ibero American Congress on Operations Research (CLAIO), 2008.
• S. D. Patek and J. T. Verella, “A Model of Technology Adoption for Physicians,” Extended abstract in the Latin-Ibero American Congress on Operations Research (CLAIO), 2008.
• S. D. Patek, J. M. Carrier, T. W. Huguenor, O. Sener, T. J. Wu, “An Agent Model of CGM Adoption,” Abstract in the Diabetes Technology Meeting, 2008.
• S. D. Patek, M. Breton, and B. Kovatchev, “Stochastic Model-Predictive Control of T!DM: Anticipating the Next Meal with Random Meal Profiles,” Abstract in the Diabetes Technology Meeting, 2008.

Network Traffic Engineering (selected):

• S. D. Patek and E. Campos-Nanez. Pricing of Dialup Services: an Example of Congestion-Dependent Pricing in the Internet. In Proc. IEEE Conf. Decision and Control (CDC 2000), pp. 2296–2301, 2000.
• S. D. Patek, R. Venkateswaran, and J. Liebeherr. Simple Alternate Routing for Differentiated Services Networks. Computer Networks, 37(3-4):447–466, November 2001.
• J. Wang, S. Patek, H. Wang, and J. Liebeherr. Traffic engineering with AIMD in MPLS networks. In Proceedings of PfHSN 2002, Lecture Notes in Computer Science Vol. 2334, pp. 192–210. Springer-Verlag, Dec. 2002.
• E. Campos-Nanez and S. D. Patek. On-line Tuning of Prices for Network Services. In Proceedings of INFOCOM 2003, San Francisco, April 2003.
• J. Liebeherr, S. D. Patek, and A. Burchard. Statistical Per-Flow Service Bounds in a Network with Aggregate Provisioning. In Proceedings of IEEE INFOCOM 2003, San Francisco, April 2003.
• S. D. Patek, J. Liebeherr, and E. Yilmaz. Tradeoffs in Designing Networks with End-to-End Statistical QoS Guarantees. Telecommunications Systems, 23(1):9–34, June 2003.
• Burchard, J. Liebeherr, and S.D. Patek, “A Min-Plus Calculus for End-to-End Statistical Service Guarantees,” IEEE Transactions on Information Theory, 52(9):4105-4114, 2006.
• K. Zhu and S. D. Patek, “A Distributed, Utility-Based Architecture for Task Assignment in Tactical WSNs,” International Workshop on Wireless Sensor Network Architecture (WWSNA), April 2007.
• D. W. Lee, E. J. Bass, S. D. Patek, and J. A. Boyd, “A Traffic Engineering Model for Air Taxi Services,” Transportation Research E: The Logistics and Transportation Review, 44:1139-1161, 2008.
• K. Zhu and S. D. Patek, Evaluation of Overlay-Based Data Dissemination over Wireless Sensor Networks, Proceedings of MILCOM 2008.

Copyright: Stephen D. Patek. Last updated on 15 November 2008.