1. Fuzhou University of International Studies and Trade, Fuzhou, Fujian, China
2. School of Computer Science and Technology, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, Guangdong, China
3. School of Natural Sciences and Humanities, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, Guangdong, China
4. Department of Computer Science and Information Engineering, National University of Kaohsiung, Kaohsiung, Taiwan
5. Department of Computer Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan