1. School of Information Systems, Singapore Management University, Singapore. E-mails: sunshine.tian86@gmail.com, robertdeng@smu.edu.sg
2. Computer and Information Science, University of Oregon, USA. E-mail: yingjiul@uoregon.edu
3. School of Electrical Engineering and Computing, University of Newcastle, NSW, Australia. E-mail: nan.li@newcastle.edu.au
4. School of Software and Microelectronics, Peking University, Beijing, China. E-mail: wpf9808@pku.edu.cn
5. Department of Computer Science and Engineering, Oakland University, USA. E-mail: anyiliu@oakland.edu