1. Department of Industrial Engineering, Chonnam National University, Gwangju, South Korea
2. Department of Industrial and Systems Engineering, Rutgers, the State University of New Jersey, Piscataway, NJ, USA
3. School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, GA, USA
4. Department of Statistics, Columbia University, New York, NY, USA
5. Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor, MI, USA