I-CHENG CHANG1,+, YU-MING PENG1, YUNG-SHENG CHEN2 AND SHEN-CHI WANG1
1Department of Computer Science and Information Engineering
National Dong Hwa University
Hualien, 974 Taiwan
E-mail: icchang@mail.ndhu.edu.tw
2Department of Electrical Engineering
Yuan Ze University
Chungli, 320 Taiwan