1. College of Computer Science, Hunan University of Technology and Business, Hunan, China
2. Gang Liu with the School of Computer Engineering and Science, Shanghai University, Shanghai, China
3. Yangfan Li with the School of Computer Science and Engineering, Central South University, Hunan, China
4. A*STAR, Institute for Infocomm Research (I2R), Singapore
5. Cen Chen with the School of Future Technology, South China University of Technology, Guangzhou, China