1. Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
2. Beihang University, Beijing, China
3. Shanghai Technical Institute of Electronics and Information, Shanghai, China
4. Department of Applied Informatics, Silesian University of Technology, Akademicka, Gliwice, Poland
5. College of Computer Science and Technology, China University of Petroleum (East China), Qingdao, China