[CPCC] TALK: Chaos-Based Information Technologies, Fri 2/20 11 AM

Ender Ayanoglu ayanoglu at uci.edu
Thu Feb 19 15:55:31 PST 2009


                                    TALK

                    Chaos-Basded Information Technologies:
                     Introduction, Survey, and Assessment

                          Dr. Christopher P. Silva

                         February 20th, 2009, Friday
                            11:00am - 12:00pm

                         Engineering Tower - Room 331

                                 ABSTRACT

The evolution of the new discipline of nonlinear engineering is taking
place along two main fronts: the first addressing higher-order effects
that have become more important in current designs because of increased
demands on performance under ever-more stringent application environments,
while the second more radical activity has focused on the explicit
harnessing of nonlinear effects through whole new designs.  For the latter
scenario, the most studied nonlinear effect is that of the complex,
random-like behavior called .chaos,. which is now being applied to such
diverse areas as communications, signal processing, fluid mechanics, and
physiology.  The field of nonlinear engineering is still evolving on many
fronts, with many international and interdisciplinary contributors.
Although several important applications have been developed and
demonstrated, the field is still relatively unexplored and rich with many
opportunities for important practical applications to real-world problems.

This presentation will focus on the application of chaos to the
efficiency, reliability, and especially security of information processing
and transfer.  It will begin by addressing the emergence of nonlinear
engineering, followed by the basics of nonlinear dynamics, chaos, and
chaotic synchronization.  Next, a survey and assessment of many
potentially important chaos-based communications, radar, and signal
processing applications will be covered, including several areas that have
disruptive potential for performance improvement.  An ongoing effort at
The Aerospace Corporation to develop and demonstrate a high frequency,
chaos-based communications system will then be highlighted.  This effort
consists of three successive stages, namely, the development of a
high-frequency chaotic oscillator, a synchronization system based on this
oscillator, and finally the modulation of this oscillator to form a
complete communications system.  Recent progress on the first two stages
of the development will be covered, including the successful experimental
demonstration of a novel chaotic oscillator with bandwidths of 2 GHz and
beyond, thus enabling a wide variety of the aforementioned chaos-based
applications (e.g., stealth radar and information/image encryption).  The
presentation will conclude with a live chaotic circuit demonstration that
serves to illuminate some of the nonlinear effects discussed in the talk.


                           SPEAKER'S BIOGRAPHY

Dr. Christopher P. Silva received the B.S., M.S., and Ph.D. degrees, all
in electrical engineering, in 1982, 1985, and 1993, respectively, from the
University of California at Berkeley.  Professor Leon O. Chua directed his
graduate work with an emphasis on nonlinear circuit and system theory.
His dissertation work concerned the analytical detection of chaotic
dynamics in nonlinear circuits, which included a detailed rigorous study
of the qualitative dynamics of both the well-known double-scroll chaotic
circuit and second-order analog phase-locked loops.

He joined the Electronics Research Laboratory of The Aerospace Corporation
in 1989 and is currently a Senior Engineering Specialist in the
Communication Electronics Department, Communications & Networking
Division.  He has been the principal or co-investigator on several
internally funded research projects addressing nonlinear microwave CAD,
private/secure communications and radar by means of chaos, stability
analysis of nonlinear circuits, and the measurement, modeling, and
compensation of nonlinear satellite communications channels, the latter of
which has become an advanced technology development for several military
space programs.  He has given many invited talks at conferences, society
meetings, universities, industry, and laboratories on the applications of
nonlinear techniques to communications and signal processing, along with
corresponding publications in various venues.

Dr. Silva is a Fellow of IEEE, a Senior Member of AIAA, and a member of
AAAS, AMS, and SIAM.


Host: Prof. Michael Green



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