Affiliation: | 1.Key Laboratory of Modern Teaching Technology, Ministry of Education, Xi’an, China ;2.School of Computer Science, Shaanxi Normal University, Xi’an, China ;3.Department of Computer Science, Taiyuan Normal University, Taiyuan, China ;4.Department of Computer Software Engineering, Soonchunhyang University, Asan, South Korea ;5.Department of Information Security, Baewha Women’s University, Seoul, South Korea ; |