1. Department of Computer Science and Engineering, Lehigh University, Bethlehem, PA, USA
2. University of Illinois at Chicago, Chicago, IL, USA
3. Emory University, Atlanta, GA, USA
4. College of Systems Engineering, National University of Defense Technology, Changsha, Hunan, P. R. China
5. University of Illinois, Urbana-Champaign at Champaign, IL, USA