1. Department of Mathematics and Physics, Xinjiang Institute of Engineering 1 , Urumqi 830023, Xinjiang, China
2. School of Mathematics, China University of Mining and Technology 2 , Xuzhou 221116, Jiangsu, China
3. Department of Basic Science, Xinjiang Institute of Light Industry Technology 3 , Urumqi 830023, Xinjiang, China
4. Department of Computer and Software Engineering, Xihua University 4 , Chengdu 610039, Sichuan, China