1. Faculty of Infrastructure Engineering, Dalian University of Technology, 116024 Dalian, P. R. China
2. Visiting Professor, Department of Management, Bialystok University of Technology, 16-001 Kleosin, Poland
3. School of Management, Harbin Institute of Technology, 150001 Harbin, P. R. China
4. School of Economics and Management, Tongji University, 200092 Shanghai, P. R. China