Affiliation: | 1.School of Information and Control Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China ;2.Mathematics and Computer Science, Shanxi Datong University, Datong, 037009, Shanxi, China ;3.School of Mathematical Sciences, Liaocheng University, Liaocheng, 252059, Shandong, China ; |