報告地點：七號樓報告廳

報告題目： Fundamental Trade-offs in Robust Control with Heterogeneous Uncertainty 

摘　　要：The new paradigm of networked control systems, where the feedback loop is closed over heterogeneous networks, has opened up a vast number of opportunities for applications in different fields while creating also a number of challenges with regard to reliability, robustness, and security of control operations. This plenary talk will address these challenges, where networks providing sensor measurements to controller(s) and those carrying control signals to the plant as well as the plant itself are vulnerable to stochastic as well as adversarial disturbances and sporadic failure of channel connectivity. The question of interest is the extent to which the plant, measured in terms of a performance metric, can tolerate such disturbances and failures, which themselves are also quantified in terms of some appropriate metrics. 

　　Following a general overview of networked control problems, the talk will focus on linear-quadratic systems, with norm-bounded deterministic (adversarial) disturbance inputs and hybrid stochastic uncertainty that impacts network channels, which is characterized by additive Gaussian noise and Bernoulli type failures. Explicit results for both the estimation problem and the control problem will be discussed under the TCP (Transmission Control Protocol) type information structure (which leads to certainty-equivalence, but not to separation of estimation and control), and the trade-offs between control performance, disturbance energy, and channel failure rates (that is, channel reliability) will be quantified. Under the UDP (User Datagram Protocol) type packet loss acknowledgement process, on the other hand, there is no certainty-equivalence, but still some trade-off results can be obtained. The talk will conclude with a discussion of future directions of research in this area and the challenges that lie ahead.

 

　　Tamer Ba?ar has been with the University of Illinois at Urbana-Champaign since 1981, where he holds the academic positions of Swanlund Endowed Chair; Center for Advanced Study Professor of Electrical and Computer Engineering; Professor, Coordinated Science Laboratory; Professor, Information Trust Institute; and Affiliate Professor, Mechanical Sciences and Engineering. He is also the Director of the Center for Advanced Study. He is a member of the US National Academy of Engineering and the European Academy of Sciences; Fellow of IEEE, IFAC, and SIAM; a past president of the IEEE Control Systems Society (CSS), the founding president of the International Society of Dynamic Games (ISDG), and a past president of the American Automatic Control Council (AACC). He has received several awards and recognitions over the years, including the highest awards of IEEE CSS, IFAC, AACC, and ISDG, the IEEE Control Systems Technical Field Award, and a number of international honorary doctorates and professorships. Dr. Ba?ar has over 700 publications in systems, control, communications, networks, optimization, and dynamic games, including books on non-cooperative dynamic game theory, robust control, network security, wireless and communication networks, and stochastic networks. He is editor of several book series.

報告題目：Uncertainty Randomization in Control Systems 

 

摘　　要：It is well-known that uncertainty leads to a significant performance degradation of control systems. At the beginning of this lecture, we illustrate this fact in the context of Model Predictive Control and discuss two alternative approaches: robust and stochastic. Subsequently, we provide a perspective of randomized techniques to handle uncertain stochastic systems. In particular, we introduce the notion of sample complexity, demonstrate its key role in feedback systems, and study related probabilistic bounds. 

 

　　Roberto Tempo  is currently a Director of Research of Systems and Computer Engineering at CNR-IEIIT, Politecnico di Torino, Italy. He has held visiting positions at Chinese Academy of Sciences in Beijing, Kyoto University, The University of Tokyo, University of Illinois at Urbana-Champaign, German Aerospace Research Organization in Oberpfaffenhofen and Columbia University in New York. His research activities are focused on the analysis and design of complex systems with uncertainty, and various applications within information technology. On these topics, he has published more than 180 research papers in international journals, books and conferences. He is also a co-author of the book “Randomized Algorithms for Analysis and Control of Uncertain Systems, with Applications”, Springer-Verlag, London, published in two editions in 2005 and 2013. 

　　Dr. Tempo is a Fellow of the IEEE and a Fellow of the IFAC. He is a recipient of the IFAC Outstanding Paper Prize Award for a paper published in Automatica and of the Distinguished Member Award from the IEEE Control Systems Society. He is a Corresponding Member of the Academy of Sciences, Institute of Bologna, Italy, Class Engineering Sciences. 

　　In 2010 Dr. Tempo was President of the IEEE Control Systems Society. He is currently serving as Editor-in-Chief of Automatica. He has been Editor for Technical Notes and Correspondence of the IEEE Transactions on Automatic Control in 2005-2009 and a Senior Editor of the same journal in 2011-2014. He is a member of the Advisory Board of Systems & Control: Foundations& Applications, Birkhauser. He was General Co-Chair for the IEEE Conference on Decision and Control, Florence, Italy, 2013 and Program Chair of the first joint IEEE Conference on Decision and Control and European Control Conference, Seville, Spain, 2005.