1. Department of Materials Science and Engineering; National Chiao Tung University; No. 1001 Ta-Hsueh Rd. Taiwan Hsinchu 300 Republic of China
2. Department of Electrical Engineering; Chang Gung University; Tao-Yuan Taiwan Republic of China
3. Department of Biomedical Engineering; National Yang Ming University; No. 155 Sec. 2, Linong St. Taipei Taiwan 112 Republic of China