1. Department of Electrical Engineering and Computer Science, National Taipei University of Technology, Taipei, Taiwan
2. Department of Electronic Engineering, Feng Chia University, Taichung, Taiwan
3. Department of Electronic Engineering, National Taipei University of Technology, Taipei, Taiwan
4. Faculty of Computing, Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, Ethiopia
5. Department of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu, Taiwan