Gwan-Hwan Hwang1, Chih-Hao Yu2, Chun-Chin Sy3 and Chiu-Yang Chang3
1Department of Computer Science and Information Engineering
National Taiwan Normal University
Taipei, 106 Taiwan
2Networks and Multimedia Institute
Institute for Information Industry
Taipei, 106 Taiwan
3Department of Electronic Engineering
National United University
Miaoli, 360 Taiwan