1. College of Information Science and Technology, Bohai University; Jinzhou 121013 Liaoning People's Republic of China
2. College of Engineering, Bohai University; Jinzhou 121013 People's Republic of China
3. Laboratory of Modeling, Information and Systems; University of Picardie Jules Verne; Amiens France
4. Department of Informatics; King's College London; London WC2R2LC United Kingdom