Once every week while school is in session, EECS invites a distinguished researcher or practitioner in a computer science or electrical and computer engineering-related field to present their ideas and/or work. Talks are generally targeted to electrical engineering and computer science graduate students. This colloquium series is free and open to everyone.

Upcoming Colloquia

Interdependence of Control and Communications in Cyber Physical Systems: From Maxwell's Demon to Diffusion

Monday, April 30, 2018 - 4:00pm to 4:50pm
LINC 200

Speaker Information

Husheng Li
Assoc. Prof.
University of Tennessee, Knoxville

Abstract

In order to understand how to operate the physical dynamics of cyber physical systems (CPSs), we study the control of entropy (or equivalently uncertainty) via communications in CPSs. We consider the controller as the Maxwell's demon that decimates the system entropy. Due to the second law of thermodynamics, the system entropy cannot be spontaneously decreased. Therefore, to reduce the system entropy, the controller needs external information communicated from sensors. The following aspects of the proposed framework will be introduced: (a) For a finite state physical system in CPS, we derive upper and lower bounds for the communication requirements. The optimal designs of message mechanism and control policy are proposed. (b) For networked physical dynamics nodes (such as generators in a power grid), the entropy propagation is described using ordinary differential equations, in which the communication requirement due to quantization error is taken into account. (c) Networked CPS is condensed to the continuous space and the corresponding entropy evolution is described using partial differential equations (PDEs), for two special types of CPS dynamics. Solutions are obtained for the PDEs to characterize the propagation, decimation and generation of entropy in the field.

Speaker Bio

Husheng Li received the BS and MS degrees in electronic engineering from Tsinghua University, Beijing, China, in 1998 and 2000, respectively, and the Ph.D. degree in electrical engineering from Princeton University, Princeton, NJ, in 2005. From 2005 to 2007, he worked as a senior engineer at Qualcomm Inc., San Diego, CA. In 2007, he joined the EECS department of the University of Tennessee, Knoxville, TN, as an assistant professor. He is promoted to associate professor in 2013. His research is mainly focused on statistical signal processing, wireless communications, networking, smart grid and game theory. Dr. Li is the recipient of the Best Paper Awards of EURASIP Journal of Wireless Communications and Networks, 2005, EURASIP Journal of Advances in Signal Processing, 2015, IEEE Globecome 2017, IEEE ICC 2011 and IEEE SmartGridComm 2012, and the Best Demo Award of IEEE Globecom, 2010.

 

Past Colloquia

Tarik Taleb
Monday, March 28, 2016 - 10:00am to 11:00am
Xusheng Xiao
Monday, March 28, 2016 - 9:00am to 10:00am
Marek Petrik
Tuesday, March 15, 2016 - 9:00am to 10:00am
Jeff Phillips
Friday, March 11, 2016 - 9:00am to 9:50am
Greg P. Carman
Monday, February 29, 2016 - 4:00pm to 4:50pm
Petros Maragos
Monday, February 22, 2016 - 4:00pm to 4:50pm
Nitin Vaidya
Friday, February 12, 2016 - 4:00pm to 4:50pm
Luc De Raedt
Monday, February 8, 2016 - 4:00pm to 4:50pm
Jonathan Lee
Monday, February 1, 2016 - 4:00pm to 4:50pm

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