1. School of Automation Science and Electrical Engineering, Beihang University (BUAA), Beijing, China
2. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, China
3. Department of Mathematics, Harbin University of Science and Technology, Harbin, China
4. School of Computer Science and Technology, Beijing University of Posts and Telecommunications, Beijing, China
5. School of Information Science and Engineering, Hangzhou Normal University, Hangzhou, China