1. College of Computer Science, Sichuan Normal University, Chengdu, China
2. Department of Electrical and Computer Engineering, University of Windsor, ON, Canada
3. Guangzhou Institute of Technology, Xidian University, Guangzhou, China
4. School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu, China
5. School of Computer Science and Electronic Engineering, University of Essex, Colchester, U.K.
6. School of Computer Science and Engineering, Nanyang Technological University, Singapore