1. College of Computer and Data Science, Fuzhou University, Fuzhou City, China
2. Key Laboratory of Intelligent Metro of Universities in Fujian, Fuzhou University, Fuzhou University, China
3. Fujian Provincial Key Laboratory of Information Processing and Intelligent Control, College of Computer and Control Engineering, College of Computer and Control Engineering at Minjiang University, Fuzhou City, China
4. Department of Information and Finance Management, National Taipei University of Technology, Taipei City, Taiwan
5. Telecommunication Laboratories, Chunghwa Telecom Co. Ltd., Taoyuan City, Taiwan