1. a Department of Electronics Engineering and Computer Sciences, Tung-Fang Institute of Technology, No. 110, Tung-Fung Road, Hunei Shiang, Kaohsiung County 829, Taiwan
2. b Medical Devices and Opto-Electronics Equipment Department, Metal Industries Research & Development Center, 3F, No. 88, Luke 5th Road, Lujhu Township, Kaoshiung 82151, Taiwan
3. c Department of Material Engineering, National Pingtung University of Science and Technology, No. 1, Syuefu Road, Neipu Township, Pingtung County 912, Taiwan;, Email: ryyang@mail.npust.edu.tw
4. d Department of Computer & Communication, Kun Shan University, No. 949, Dawan Road, Yongkang City, Tainan County 710, Taiwan