Affiliation: | (1) Department of Computer Sciences, The University of Minnesota, Minneapolis, MN 55455, USA, US;(2) Department of Applied Mathematics, Chiaotung University, Hsinchu, 30045 Taiwan (R.O.C.), TW;(3) Department of Mathematics, Pennsylvania State University, University Park, PA 16802, USA, US;(4) Faculty of Industrial Engineering and Management, Technion - Israel Institute of Technology, Haifa 32000, Israel, IL |