1. School of Computer Science and Technology, Shandong University, Qingdao, China
2. Department of Electrical & Computer Engineering, Michigan State University, East Lansing, MI, USA
3. Department of Computer Science and Engineering, University of North Texas, Denton, TX, USA
4. Department of Computer Science, University of Helsinki, Helsinki, Finland
5. Department of Computer Science, North Carolina A&T State University, Greensboro, NC, USA
6. School of Electrical Engineering and Computer Science, TU Berlin, Berlin, Germany