1. School of Computer Engineering and Science, Shanghai University, Shanghai, China
2. College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai, China
3. College of Information Engineering, Chaohu University, Hefei, China
4. College of Computer Science and Technology, Hainan Tropical Ocean University, Sanya, China
5. School of Computer and Information Engineering, Fuyang Normal University, Fuyang, China
6. Shanghai Jiling Information Technology Company, Shanghai, China