1. School of Computer Science and EngineeringCentral South University Changsha China
2. School of InformaticsHunan University of Chinese Medicine Changsha China
3. College of Computer Science and TechnologyHuaqiao University Xiamen China
4. School of Computer Science and EngineeringHunan University of Science and Technology Xiangtan China
5. Department of Computer ScienceStony Brook University Stony Brook New York USA