1. a Department of Electronic Engineering, National Taipei University of Technology, 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 10608, Taiwan
2. b Department of Electronic Engineering, National Taipei University of Technology, 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 10608, Taiwan
3. c Department of Greenergy, National University of Tainan, 33, Sec. 2, Shu-Lin St., Tainan 70005, Taiwan
4. d Department of Greenergy, National University of Tainan, 33, Sec. 2, Shu-Lin St., Tainan 70005, Taiwan