1. School of Computer Science and Technology, University of South China, Hengyang, China
2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
3. Math and Computer Science Department, Suffolk University, Boston, MA, USA
4. School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, China
5. Electrical and Computer Engineering, Virginia Commonwealth University, Richmond, VA, USA