Paul C. H. Lee, Mei-Ling Chiang, Shang-Te Hsu, Ta-Chuan Liu#,
Wu-Yang Chung and Ruei-Chuan Chang**
Department of Computer and Information Science
National Chiao Tung University
Hsinchu, Taiwan 300, R.O.C.
#Computer Center
National Chiao Tung University
Hsinchu, Taiwan 300, R.O.C.
**Institute of Information Science
Academia Sinica, Taipei, Taiwan 115, R.O.C.