WEI-LIEH HSU, HSIAO-RONG TYAN, YU-MING LIANG BOR-SHENN JENG AND KUO-CHIN FAN Department of Computer Science and Information Engineering National Central University Chungli, 320 Taiwan Department of Information and Computer Engineering Chung Yuan Christian University Chungli, 320 Taiwan Institute of Information Science Academia Sinica Taipei, 115 Taiwan Telecommunication Laboratories Chunghwa Te...