1. School of Computer Science and Technology, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, China
2. School of Natural Sciences and Humanities, Harbin Institute of Technology, Shenzhen Graduate School, Shenzhen, China
3. Dept. of Computer Science and Information Engineering, National University of Kaohsiung, Kaohsiung, Taiwan, Dept. of Computer Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan
4. Department of Computer Science, University of Nevada, Las Vegas, USA
5. Department of Telecommunications, VSB-Technical University of Ostrava, Czech Republic