1. School of Automation and Electrical Engineering, Linyi University, Linyi, China
2. School of Electrical and Electronic Engineering, The University of Suwon, Hwaseong-si, South Korea
3. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
4. Department of Electronic Engineering, Seokyeong University, Seoul, South Korea
5. Department of Mathematics and Statistics, Sejong University, Seoul, South Korea