1. Department of Construction and Real Estate, Southeast University, Nanjing P. R. China
2. School of Management and Engineering, Nanjing University, Nanjing P. R. China
3. Department of Civil and Environmental Engineering, University of Maryland, College Park, USA; Institute for Theoretical and Applied Informatics, Polish Academy of Sciences, Gliwice, Poland; Chaoyang University of Technology, Taichung, Taiwan