Affiliation: | 1. School of Mathematical Sciences, Huaiyin Normal University, , Jiangsu Huaian 223001, China;2. School of Computer Science and Technology, Huaiyin Normal University, , Jiangsu Huaian 223001, China;3. College of Computer Science and Technology, Nanjing University of Aeronautics & Astronautics, , Jiangsu Nanjing 210016, China |