1. School of Engineering, Qufu Normal University, Rizhao, China
2. Department of Electrical Engineering, Yeungnam University, Kyongsan, Republic of Korea
3. School of Control Science and Engineering, Tiangong University, Tianjin, China
4. School of Mathematics, Southeast University, Nanjing, China
5. College of Mathematics and Statistics, Guangxi Normal University, Guilin, China