1. School of Automation, Qingdao University, Qingdao, China
2. Frontiers Science Center for Mobile Information Communication and Security, School of Mathematics, Southeast University, Nanjing, China
3. Center for Control and Engineering Computation and the School of Mathematics and Statistics, Shandong Normal University, Jinan, China
4. School of Mathematics and Natural Sciences, Kaunas University of Technology, Kaunas, Lithuania