1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics , Nanjing, China
2. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology , Nanjing, China
3. Department of Mechanical Engineering, Massachusetts Institute of Technology , Cambridge, MA, USA
4. Department of Information System and Business Analytics, College of Business and Public Administration, Eastern Washington University , Spokane, WA, USA