1. College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. International Joint Research Laboratory of Spatio-Temporal Information and Intelligent Location Services, Guilin University of Electronic Technology, Guilin, China
3. Criminal Investigation School, Southwest University of Political Science and Law, Chongqing, China
4. School of Information Management, Jiangxi University of Finance and Economics, Nanchang, China