*Tai-Ling Huang1, Wei-Che Li1, Jen-Hsuan Wang1, Chia-Yen Lee2, Ching-Cheng Chuang1, Jung-Chih Chen1
(1. Institute of Biomedical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan , 2. Department of Electrical Engineering, National United University, Miaoli 36063, Taiwan )