1. School of Computer and Control Engineering, Yantai University, Yantai, China
2. Department of Electrical and Control, Qilu University of Technology(Shandong Academy of Sciences), Jinan, China
3. Department of Computer Science, Georgia State University, Atlanta, GA, USA
4. College of Computer Science, Chongqing University, Chongqing, China
5. Department of Computer Science and Engineering, Southeast University, Nanjing, China