1. School of Economics and Management, Chongqing Jiaotong University, Chongqing, People's Republic of China
2. Performance Analysis Center of Production and Operations Systems (PacPos), Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China
3. Department of Industrial Engineering, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, People's Republic of China
4. Department of Computer Science, City University of New York, College of Staten Island, Staten Island, NY, USA