Affiliation: | 1. Department of Computer Science and Information Engineering, National Central University, No. 300, Jung-da Road, Chung-li, Tao-yuan 320, Taiwan, ROC;2. Graduate School of Network Learning Technology, National Central University, No. 300, Jung-da Road, Chung-li, Tao-yuan 320, Taiwan, ROC;3. Department of Computer Science, Northern Illinois University, DeKalb, IL 60115, USA |