报告时间：12月10日（星期五）9:30
报告地点：信息楼99905银河官方网310报告厅、腾讯会议（ID：535 484 770）
（一）
报 告 人：陈杰，香港城市大学（City University of Hong Kong）教授
报告题目：When is a Time-Delay System Stable and Stabilizable?
Operator Perturbation Theory and Its Applications
内容简介：Time delays arise in the transport of energy, mass, information and such, and are omnipresent in natural and engineered systems. Modern interconnected networks are especially prone and indeed, are vulnerable to long and variable delays; systems and networks in this category are many, ranging from communication networks, sensor networks, cyber-physical systems, to biological systems. Except on rare instances, time delays are likely to result in degraded performance, poor robustness, and even instability, which consequently pose significant challenges to the analysis and design of control systems under delayed feedback. More broadly, time-delay systems are just one of many examples in which a certain system parameter plays critical roles and when it reaches a critical threshold value, the system may exhibit drastically different behaviors. In this talk I shall present an operator-theoretic approach for the analysis of such systems, using time-delay systems as a case of motivation and study. We ask such questions as when will a delay system be stable or unstable, and for what values of delay? When can an unstable delay system be stabilized? What range of delay can a feedback system tolerate to maintain stability? Fundamental questions of this kind have long eluded engineers and mathematicians alike, yet ceaselessly invite new thoughts and solutions. We develop in full an operator perturbation method that departs from both the classical algebraic and the contemporary LMI solution approaches, notable for both its conceptual appeal and its computational efficiency. Preceding this development I shall discuss the mathematical foundation centered at operator perturbation series, which characterize the analytical and asymptotic properties of eigenvalues of matrix-valued functions or operators.
报告人简历：Jie Chen is a Chair Professor in the Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China. He received the B.S. degree in aerospace engineering from Northwestern Polytechnic University, Xian, China in 1982, the M.S.E. degree in electrical engineering, the M.A. degree in mathematics, and the Ph.D. degree in electrical engineering, all from The University of Michigan, Ann Arbor, Michigan, in 1985, 1987, and 1990, respectively.
Prior to joining City University, he was with School of Aerospace Engineering and School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia from 1990 to 1993, and with University of California, Riverside, California from 1994 to 2014, where he was a Professor and served as Professor and Chair for the Department of Electrical Engineering. His main research interests are in the areas of linear multivariable systems theory, system identification, robust control, optimization, time-delay systems, networked control, and multi-agent systems. He is the author of several books, on subjects ranging from system identification to time delay systems, and to information-theoretic control and fundamental control limitations.
An elected Fellow of IEEE, Fellow of AAAS, Fellow of IFAC and a Yangtze Scholar/Chair Professor of China, Dr. Chen was a recipient of 1996 US National Science Foundation CAREER Award, 2004 SICE International Award, and 2006 Natural Science Foundation of China Outstanding Overseas Young Scholar Award. He was an IEEE Control Systems Society (CSS) Distinguished Lecturer and served on the IEEE CSS Board of Governors and as the IEEE CSS Chapter Activities Chair. He also served on a number of journal editorial boards, as an Associate Editor and a Guest Editor for the IEEE Transactions on Automatic Control, a Guest Editor for IEEE Control Systems Magazine, an Associate Editor for Automatica, and the founding Editor-in-Chief for Journal of Control Science and Engineering. He presently serves as an Associate Editor for SIAM Journal on Control and Optimization, and for International Journal of Robust and Nonlinear Control. Moreover, he routinely serves on program and organizing committees of international conferences, most recently as the General Chair of the 2019 IEEE Conference on Control Technology and Applications.
（二）
报 告 人：赵延龙，中国科学院数学与系统科学研究院（Academy of Mathematics and Systems
Science，Academy of Mathematics and Systems Science）研究员
报告题目：集值系统的辨识与控制
内容简介：集值系统在实际中具有广泛应用，其辨识和控制存在诸多本质困难。我们将从几类典型的集值系统入手，介绍集值系统辨识与控制研究的特点、难点和成果，并浅谈集值系统的相关应用研究。
报告人简历：赵延龙，中国科学院数学与系统科学研究院研究员。2002年本科毕业于山东大学，2007年博士毕业于中国科学院数学与系统科学研究院，研究兴趣包括集值系统辨识与适应控制、网络通信、金融系统建模、系统生物学等，在领域内具有重要影响的期刊或会议上发表学术论文80余篇。现任SCI期刊Journal of Systems Science and Complexity负责控制领域的副主编，Automatica、SIAM Journal on Control and Optimization和IEEE Transactions on Systems, Man and Cybernetics: Systems等期刊的编委。曾任亚洲控制协会副主席，现任中国自动化学会副秘书长、中国自动化学会控制理论专委会副主任等；曾获国家自然科学二等奖、中国工业与应用数学学会优秀青年学者奖等科研奖励；先后主持国家优秀青年基金、国家杰出青年基金、中国科学院稳定支持基础研究领域青年团队计划等项目。
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