Affiliation: | 1. School of Information Science and Technology , Yancheng Teachers University , Yancheng 224002, P.R. China;2. School of Automation , Southeast University , Nanjing 210096, P.R. China jjyuseu@gmail.com;4. School of Automation , Southeast University , Nanjing 210096, P.R. China;5. School of Mathematics , Yancheng Teachers University , Yancheng 224051, P.R. China |