1. School of Mathematics and Statistics, Linyi University, Linyi, China
2. School of Electrical and Electronic Engineering, The University of Suwon, Hwaseong-si, South Korea
3. Research Center for Big Data and Artificial Intelligence, Linyi University, Linyi, China
4. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
5. Department of Electronic Engineering, Seokyeong University, Seoul, South Korea
6. Department of Mathematics and Statistics, Sejong University, Seoul, South Korea