1. Smart Learning Institute of Beijing Normal University, Beijing, People’s Republic of China
2. Research laboratory of Technologies of Information and Communication & Electrical Engineering (LaTICE), Tunis higher school of engineering (ENSIT), University of Tunis, Tunis, Tunisia
3. School of Computing and Information Systems, Athabasca University, Athabasca, Canada
4. University of North Texas, Denton, TX, USA
5. Department of Applied Foreign Languages, National Yunlin University of Science and Technology, Douliou, Taiwan