1. Department of Computer Science, City University of Hong Kong, Hong Kong SAR, China
2. Graduate School, Army Engineering University of PLA, Nanjing, China
3. Department of Computer Science, Munster Technological University, Cork, Ireland
4. Faculty of Data Science, Shiga University, Hikone, Japan
5. Department of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, China
6. Department of Computer Education, Sungkyunkwan University, Seoul, South Korea
7. Division of Computer Science, The University of Aizu, Fukushima, Japan