1. Department of Electronic Engineering; Feng Chia University; No.100, Wenhwa Rd. Seatwen, Taichung 40724 Taiwan
2. Ph.D. Program of Electrical and Communications Engineering; Feng Chia University; No.100, Wenhwa Rd. Seatwen, Taichung 40724 Taiwan
3. Department of Dentistry; College of Oral Medicine; Chung Shan Medical University; Dental Department; Chung Shan Medical University Hospital; No.110, Sec.1, Jianguo N. Rd. Taichung 40201 Taiwan
4. Institute of Nanoscience and Department of Physics; National Chung Hsing University; Taichung 402 Taiwan
5. Department of Chemical Engineering; Feng Chia University; No.100, Wenhwa Rd. Seatwen, Taichung 40724 Taiwan
6. Professor & Director in Stem Cell Center; Department of Medical Research; Taichung Veterans General Hospital; No. 160, 3rd Section, Taichung Harbor Road Taichung 40705 Taiwan