Affiliation: | 1.College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai, China, 201418 ;2.Shanghai Engineering Research Center of Intelligent Education and Bigdata, Shanghai Normal University, Shanghai, China, 201418 ;3.School of Logistics Management and Engineering, Nanning Normal University, Nanning, Guangxi, China, 530299 ;4.College of Computer Science and Technology, Hainan Tropical Ocean University, Sanya, China, 572022 ; |