Wisconsin professor to give event modeling talk Monday

Dr. Shiyu Zhou, associate professor in the Department of Industrial and Systems Engineering at the University of Wisconsin-Madison, will give a talk on event modeling Monday (April 19) at 3 p.m. in Room 203 of the Zachry Engineering Center at Texas A&M University.Zhou's talk, "Discrete Event Modeling and Analysis for Production and Service Systems," is part of the Department of Industrial and System Engineering's seminar series sponsored by Parsons.Abstract Discrete event sequences record both system level activities (e.g., order tracking, patient routing) and detailed machine level operations (e.g., system failures, user actions, task status). It is generally believed that these data provide rich information regarding the system working conditions and could be used for condition monitoring, diagnosis, and optimal maintenance. This presentation focuses on the modeling and analysis of discrete event sequences in production and service systems.In the first part, the distributional properties of cycle times are investigated, which are represented by the time elapses between events "customer departure" and "customer arrival," at different throughput rates. A nonlinear quantile regression is proposed to characterize the cycle time distributions with mild assumptions. The model can be used to predict the cycle time at different throughputs and is suitable for scheduling/planning optimization. Additionally, an efficient monitoring method is also proposed to fast detect the changes in the system by observing individual cycle times. In the second part, event logs in medical imaging systems are modeled and used to characterize the system degradation. The relationship between system failure time and other precursor events are quantified statistically. Based on the model, optimal variability sensitive condition based maintenance is developed to minimize the weighted sum of average cost and cost variability of the maintenance.Biography Dr. Shiyu Zhou is an associate professor in the Department of Industrial and Systems Engineering at the University of Wisconsin-Madison. He earned his B.S. and M.S. in mechanical engineering at University of Science and Technology of China; and a master's degree in industrial engineering and Ph.D. in mechanical engineering from the University of Michigan.Zhou's research focuses on the fault management of complex engineering systems by integrating statistics, system and control theory, and engineering knowledge. His research is sponsored by the National Science Foundation, the U.S. Department of Energy, NIST-ATP and industry. He is a recipient of the NSF CAREER Award and the best application paper award from IIE Transactions in 2006. Dr. Zhou is a member of IIE, INFORMS, ASME and SME.