1. Department of Computer Science, City University of Hong Kong, Hong Kong, China
2. College of Information Science and Technology, Nanjing Forestry University, Nanjing, China
3. Zhongda Group, Haiyan County, Jiaxing City, China
4. Quaid-e-Awam University of Engineering, Science and Technology, Larkana, Pakistan
5. Department of Computer Science and Engineering, Sejong University, Seoul, Korea
6. Division of Computer Science, University of Aizu, Fukushima, Japan