Chia-Chun Tsai+, Hann-Cheng Huang, Trong-Yen Lee, Wen-Ta Lee and Jan-Ou Wu
+Department of Computer Science and Information Engieering
Nanhua University
Chiayi, 622 Taiwan
E-mail: chun@mail.nhu.edu.tw
Graduate Institute of Computer and Communication Engineering
National Taipei University of Technology
Taipei, 106 Taiwan