1. School of Economics & Trade, Hunan University, Changsha 410082, Hunan, P. R. China
2. China GreatWall Technology Group Co., Ltd., Changsha 410100, Hunan, P. R. China
3. Department of Logistics Information, Hunan Vocational College of Modern Logistics, Changsha 410131, Hunan, P. R. China
4. College of Information Science and Engineering, Hunan University, Changsha 410082, Hunan, P. R. China
5. School of Information Engineering, Zunyi Normal University, Zunyi, Guizhou 563006, P. R. China