Affiliation: | 1. School of Computer Science, Civil Aviation Flight University of China, Guanghan, Sichuan, 618307, PR China;2. College of Science, Sichuan University of Science and Engineering, Zigong, Sichuan, 643000, PR China;3. School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, PR China |