1. School of Information Science and Engineering, Huaqiao University, Quanzhou, China
2. School of Engineering and School of Information Science and Engineering, Huaqiao University, Quanzhou, China
3. School of Engineering, Huaqiao University, Quanzhou, China
4. Department of Computer Science and Information Engineering, Ilan University, Yilan City, Taiwan
5. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore