1. School of Computer Science, Hunan University of Technology, Zhuzhou, China
2. School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, China
3. Hunan Key Laboratory for Computation and Simulation in Science and Engineering, Xiangtan University, Xiangtan, China
4. School of Computer Science, Hunan Institute of Technology, Hengyang, China
5. School of Science, Jiangnan University, Wuxi, China