CHAOS AND CONTROL

		     Professor Elizabeth Bradley
		  University of Colorado at Boulder

Understanding and exploiting the special properties of chaos can lead
to designs that vastly improve the performance of many practical and
useful systems --- spacecraft trajectories that require less fuel, for
example, or tracking circuitry with broader capture ranges and fuel
injectors that mix gasoline and air more effectively.  Control
strategies that leverage chaos's characteristic geometry, ergodicity,
and sensitivity to attain such improvements rely on powerful
computational tools that use a combination of quantitative and
qualitative reasoning to work with the special properties involved.
This talk will begin with a review of the mathematical theory and
computational techniques that are used in the control of chaos, and
then cover a variety of interesting examples ranging from science and
engineering to dance.

Elizabeth Bradley received the S.B., S.M., and Ph.D. degrees from MIT
in 1983, 1986, and 1992, respectively, including a one-year leave of
absence to compete in the 1988 Olympic Games, and has been with the
Department of Computer Science at the University of Colorado at
Boulder since January of 1993.  Her research interests are nonlinear
dynamics and artificial intelligence.  She is the recipient of a NSF
National Young Investigator award and a Packard Fellowship.