1. School of Computer Science and the Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing, China
2. Shaanxi Key Laboratory of Information Communication Network and Security, Xi'an University of Posts & Telecommunications, Xi'an, China
3. Guangzhou Institute of Technology, Xidian University, Guangzhou, China
4. School of Information and Electronics, Beijing Institute of Technology, Beijing, China