1. School of Computer and Information Engineering, Xiamen University of Technology, Xiamen, People’s Republic of China
2. College of Computer Science and Electronic Engineering, Hunan University, Changsha, People’s Republic of China
3. College of Computer Science and Engineering at Yanbu, Taibah University, Yanbu, Saudi Arabia
4. Department of Computer Science and Information Engineering, Providence University, Taichung, Taiwan
5. Hunan Provincial Key Laboratory of Network Investigational Technology, Hunan Police Academy, Changsha, People’s Republic of China