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060328JinFaLee

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									Department of Electronic Engineering                                                                          IEEE AP/MTT HK
                                                                                                              Joint Chapter
                                                        Seminar on
                          Finite Element Domain Decomposition Techniques for
                                 Solving Large Electromagnetic Problems
                                                                by
                                    Jin-Fa Lee, Professor,
                     ElectroScience Lab., ECE Dept., Ohio State Uiversity,
                                 Columbus, OH 43212, USA.


Summary
          The quest for more efficient and accurate computational electromagnetics (CEM) techniques has been vital in the design
of modern engineering. The main motivation of this work lays in a simple yet crucial observation of most real-world
electromagnetic problems. They all exhibit certain degrees of redundancies, locally and/or globally. Take for example a vehicle: its
geometry is symmetric with respect to a mid-plane; for an antenna array or frequency selective surface the redundancies are more
obvious since all elements are identical. In our group, we have recently developed a novel approach for analyzing electrically
large, geometrically complicated structures that involve complex materials, by systematically exploiting local or global mirror,
translational or rotational symmetries in the geometry.
          The approach is based on the domain decomposition (DD) methodology tailored specifically for electromagnetic wave
problems. Although DDM has been popular in the applied mathematics community for solving Poisson equations, it is not directly
applicable to wave propagation problems. In particular, I shall discuss three major ingredients which enable the DDM for solving
large electromagnetic problems.

1.   Cement Technique
2.   Converging Transmission Conditions
3.   Finite Element Tearing and Interconnecting (FETI) Algorithm

The power of the developed DDM will be demonstrated through a number of large electromagnetic problems, involving up to
billions of finite element unknowns, and its variants such as domain decomposition finite elements / boundary elements method
(DD-FE-BEM), and a modeling procedure for industrial applications.

Biography
Jin-Fa Lee received the B.S. degree from National Taiwan University, in 1982 and the M.S. and Ph.D. degrees from Carnegie-Mellon
University in 1986 and 1989, respectively, all in electrical engineering. From 1988 to 1990, he was with ANSOFT Corp., where he
developed several CAD/CAE finite element programs for modeling three-dimensional microwave and millimeter-wave circuits. From
1990 to 1991, he was a post-doctoral fellow at the University of Illinois at Urbana-Champaign. From 1991 to 2000, he was with
Department of Electrical and Computer Engineering, Worcester Polytechnic Institute. Currently, he is a Professor at ElectroScience
Lab., Dept. of Electrical Engineering, Ohio State University. Prof. Lee becomes an IEEE Fellow on year 2005. His students won the
4th place in student paper contest in IEEE APS/URSI 2004, 3rd place in IEEE APS/URSI 2005, and 1st place in EMC Zurich 2006.
Professor Lee’s research interests mainly focus on numerical methods and their applications to computational electromagnetics.
Current research projects include: analyses of numerical methods, fast finite element methods, fast integral equation methods, hybrid
methods, three-dimensional mesh generation, domain decomposition methods, cement finite elements, and finite element tearing and
interconnecting methods.
                                   Date        : 28 March 2006 (Tuesday)
                                   Time        : 11:00am – 12:15pm
                                   Venue       : G6302, 6/Floor, Green Zone, Academic Building
                                                 City University of Hong Kong

                                               ** ALL ARE WELCOME **

Enquiry: Dr Wing Shing CHAN, Department of Electronic Engineering, CityU
         Tel: 2788 7804 Fax: 2788 7791 Email: eeej2710@cityu.edu.hk

								
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