Been-Chian Chien, Jung-Yi Lin1 and Wei-Pang Yang1,2
Department of Computer Science and Information Engineering
National University of Tainan
Tainan, 700 Taiwan
1Department of Computer and Information Science
National Chiao Tung University
Hsinchu, 300 Taiwan
2Department of Information Management
National Dong Hwa University
Hualien, 974 Taiwan