1. School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China.
2. Department of Electrical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea (e-mail: jessie@ynu.ac.kr)
3. School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China (e-mail: songshuai_1010@163.com)
4. School of Information Engineering, Henan University of Science and Technology, Luoyang 467023, China.