1. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China
3. Faculty of Engineering and Environment, Northumbria University, Newcastle, U.K.
4. University of Lorraine, Metz, France
5. Ecole Militaire Polytechnique, Algiers, Algeria