1. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712;
2. Department of Mathematics, Pennsylvania State University, University Park, Pennsylvania 16802;
3. The Harold and Inge Marcus Department of Industrial and Manufacturing Engineering, College of Engineering, Pennsylvania State University, University Park, Pennsylvania 16802;
4. The Harold and Inge Marcus Department of Industrial and Manufacturing Engineering, College of Engineering, Pennsylvania State University, University Park, Pennsylvania 16802