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主   办:工业工程与管理系
报告人:Professor Christos G. Cassandras
时   间:5月29日(周五)上午10:00
地   点:方正大厦512会议室
主持人:侍乐媛 教授


The event-driven paradigm is an alternative viewpoint, complementary to the time-driven approach, for modeling, sampling, estimation, control, and optimization of dynamic systems. For example, time-driven sampling and communication with energy-constrained wireless devices can be inefficient, unnecessary, and sometimes infeasible. The key idea in event-driven control is that a “clock” should not be dictating actions simply because a time step is taken; rather, an action should be triggered by an “event” which may be a well-defined condition on the system state (including a simple time step) or a random state transition.

We will present results in two areas where event-driven control and optimization have made significant progress. First, in distributed multi-agent systems, we will show how event-driven, rather than synchronous, communication can guarantee convergence in cooperative distributed optimization while provably maintaining optimality. Second, in stochastic hybrid systems, we will show how on-line gradient estimation techniques boil down to a set of event-driven Infinitesimal Perturbation Analysis equations (an “IPA calculus”) where the estimates are (under certain conditions) robust with respect to modeling details and noise, and scalable in the number of observed events. We will illustrate how this IPA calculus is used to solve a large class of stochastic optimization problems.



Christos G. Cassandras is Distinguished Professor of Engineering at Boston University. He is Head of the Division of Systems Engineering, Professor of Electrical and Computer Engineering, and co-founder of Boston University’s Center for Information and Systems Engineering (CISE). He received degrees from Yale University (B.S., 1977), Stanford University (M.S.E.E., 1978), and Harvard University (S.M., 1979; Ph.D., 1982). In 1982- 84 he was with ITP Boston, Inc. where he worked on the design of automated manufacturing systems. In 1984-1996 he was a faculty member at the Department of Electrical and Computer Engineering, University of Massachusetts/Amherst. He specializes in the areas of discrete event and hybrid systems, cooperative control, stochastic optimization, and computer simulation, with applications to computer and sensor networks, manufacturing systems, and transportation systems. He has published over 350 refereed papers in these areas, and five books. He has guest-edited several technical journal issues and currently serves on several journal Editorial Boards, including Editor of Automatica. In addition to his academic activities, he has worked extensively with industrial organizations on various systems integration projects and the development of decision-support software. He has most recently collaborated with The MathWorks, Inc. in the development of the discrete event and hybrid system simulator SimEvents.

Dr. Cassandras was Editor-in-Chief of the IEEE Transactions on Automatic Control from 1998 through 2009 and has also served as Editor for Technical Notes and Correspondence and Associate Editor. He was the 2012 President of the IEEE Control Systems Society (CSS). He has also served as Vice President for Publications and on the Board of Governors of the CSS, as well as on several IEEE committees, and has chaired several conferences. He has been a plenary/keynote speaker at numerous international conferences, including the American Control Conference in 2001 and the IEEE Conference on Decision and Control in 2002, and has also been an IEEE Distinguished Lecturer.

He is the recipient of several awards, including the 2011 IEEE Control Systems Technology Award, the Distinguished Member Award of the IEEE Control Systems Society (2006), the 1999 Harold Chestnut Prize (IFAC Best Control Engineering Textbook) for Discrete Event Systems: Modeling and Performance Analysis, a 2011 prize and a 2014 prize for the IBM/IEEE Smarter Planet Challenge competition (for a “Smart Parking” system and for the analytical engine of the Street Bump system respectively), the 2014 Engineering Distinguished Scholar Award at Boston University, several honorary professorships, a 1991 Lilly Fellowship and a 2012 Kern Fellowship. He is a member of Phi Beta Kappa and Tau Beta Pi. He is also a Fellow of the IEEE and a Fellow of the IFAC.

Division of Systems Engineering,

Department of Electrical and Computer Engineering, and

Center for Information and Systems Engineering (CISE)

Boston University , Brookline, MA 02446,  cgc@bu.edu, http://vita.bu.edu/cgc