1. Key Laboratory of Modern Teaching Technology, Ministry of Education, China and The School of Computer Science, Shaanxi Normal University, China
2. Puyang Vocational and Technical College, China and Puyang Institute of Technology, Henan University, China
3. The Department of Computer Science and Engineering, Tongji University, China
4. The School of Computer Science and Electronic Engineering, University of Essex, UK
5. The School of Computer Science, Shaanxi Normal University, China