1. School of Mathematics, Southeast University, Nanjing, China
2. Department of Computer Science, Brunel University London, Uxbridge, U.K
3. College of Information Science and Technology, Donghua University, Shanghai, China
4. Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment, Ministry of Education, Anhui Polytechnic University, Wuhu, China
5. School of Information Science and Engineering, Hangzhou Normal University, Hangzhou, China