CDS Invited Lecture: Cedric Langbort, "New Questions in Distributed Control"

Wednesday, September 19, 2007
2:00 p.m.
2168 A.V. Williams Building
Pam White
301 405 6576

Control and Dynamical Systems Invited Lecture Series
Some New Questions in Distributed Control

Cedric Langbort
Department of Aerospace Engineering
University of Illinois at Urbana-Champaign

P.S. Krishnaprasad and Vijay Gupta

Since the field started to investigate the influence of specific information patterns in optimal control in the sixties, ``distributed control’’ has almost become synonymous with the problem of designing controllers with externally-imposed observation and communication structures. While the difficulty of this question certainly justifies the extensive attention it has received until now, the current state of technology, coupled with the benefits we expect from network-centric decision systems, have made it necessary to consider other types of theoretical problems, whose models and goals, although also involving group decision-making under partial information, do not readily fit the traditional framework outlined above.

In this talk, I will give motivation and results for some of these new distributed control problems. In particular, I will be interested in questions such as:

* What is the minimal decision architecture needed to achieve a particular cooperative control task?

* Can control design itself be distributed between different agents and, if so, what does it mean in terms of privacy, reconfigurability, and incentive compatibility?

* What are the consequences of segmentation of information about a plant's model (as opposed to plant observation) and disparity of control authority on the quality of group decision?

These issues will be tackled through a combination of tools and viewpoints from control theory, industrial organization theory in economics, and distributed computing. At the end of the talk, I will also present an online multiplayer game currently under development at the University of Illinois, which we plan to use as a testbed to learn how groups of human subjects take decision in the presence of segmentation of information. We hope that these observations will inform our theoretical models and help start the development of rigorous methods for the "distributed control" of mixed teams of humans and machines.

Some of the work presented here is joint with Dr. Vijay Gupta (ISR, U. Maryland), Dr. Jean-Charles Delvenne (Imperial), and Robert Wilson (UIUC).

Cedric Langbort is currently an assistant professor of Aerospace Engineering at the University of Illinois at Urbana-Champaign (UIUC). He studied at the Ecole Nationale Superieure de l'Aeronautique et de l'Espace - Supaero in Toulouse (Aerospace Engineering degree; M.S. control theory) and the Institut Non-Lineaire in Nice (M.S. dynamical systems) before receiving the Ph.D. degree in Theoretical & Applied Mechanics from Cornell University in January 2005. He then spent a year and a half as a postdoctoral scholar in the Center for the Mathematics of Information at Caltech before joining UIUC.

His work is in the field of Aerospace Information Technology with applications to large-scale distributed systems such as multi-vehicle missions, air traffic management systems, or smart materials. Of particular interest are fundamental questions regarding the role of communication constraints between subsystems, system's architecture, tolerance to individual failure, and intrinsic limitations of distributed control algorithms due to segmentation of information.

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