1. Industrial Engineering and Management, College of Engineering, Peking University, Beijing, China;
2. Computational Science Program, University of Texas at El Paso (UTEP), El Paso, TX;
3. School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ;
4. Industrial, Manufacturing and Systems Engineering, University of Texas at El Paso (UTEP), El Paso, TX