Management Science and Engineering, School of Management, Harbin Institute of Technology, Harbin, China
Management Science and Engineering, School of Management, Harbin Institute of Technology, Harbin, China
Copyright © 2014 Alhaji Mohamed Hamza Conteh, Xiangbin Yan et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.