1. Department of Electronic Engineering, Ming Chi University of Technology, Taishan, New Taipei, Taiwan
2. Department of Electronic Engineering, National Chin-Yi University of Technology, Taiping, Taichung, Taiwan
3. Department of Electrical and Computer Engineering, California State University at Fullerton, Fullerton, CA, USA
4. Department of Electrical Engineering, National Formosa University, Huwei, Yunlin, Taiwan