Using NU-SSGA to Reduce the Searching Time in Inverse Problem of a Buried Metallic Object
Speaker: Professor Chien-Ching Chiu, Tamkang University, Taiwan, R.O.C
When: 2007-05-04 10:00:00
Venue: 78-420
Host: Professor Marek E. Bialkowski
Abstract:We describe an inverse scattering problem with the aim of reducing the
computation time for recovering the details of a perfectly conducting
cylindrical object buried in a half-space. First, we use Fourier-series or
cubic-spline methods to describe the shape and reformulate the inverse
problem into an optimization one. Then we solved it by the improved
steady-state genetic algorithm (SSGA) and simple genetic algorithm (SGA)
respectively and compare the cost time in finding out the global extreme
solution of the objective function. It is found the searching ability of
SSGA is much powerful than that of the SGA. Even when the initial guess is
far away from the exact one, the cost time for converging to a global
extreme solution using by SSGA is much less than that by SGA. Numerical
results are given to show that the inverse problem by using SSGA is much
better than SGA in time costing.
Biography:Chien-Ching Chiu was born in Taoyuan, Taiwan, R.O.C., on January 23, 1963.
He received the B.S.C.E. degree from National Chiao Tung University,
Hsinchu, Taiwan, R.O.C., in 1985 and the M.S.E.E. and Ph.D. degrees from
National Taiwan University, Taipei, Taiwan, R.O.C., in 1987 and 1991,
respectively. From 1987 to1989, he served in the R.O.C. Army Force as a
Communication Officer. In 1992, he joined the faculty of the Department of
Electrical Engineering, Tamkang University, where he is now a Professor.
He was a Visiting Scholar at the Massachusetts Institute of Technology,
Cambridge, and the University of Illinois at Urbana-Champaign, from 1998
to 1999. He was a visiting professor at the University of Wollongong,
Australia in 2006.His current research interests include microwave
imaging, numerical techniques in electromagnetics and indoor wireless
communications.
Type: ITEE Seminar
Contact:Professor Marek E. Bialkowski, seminar host (meb@itee.uq.edu.au)
or Guido Governatori (ITEE seminar co-ordinator)
(guido@itee.uq.edu.au)