Institution: | [1]Coll. of Economics and Management, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P. R. China [2]School of Traffic and Transportion Engineering, Changsha Univ. of Science and Technology, Changsha 410004, P. R. China [3]School of Information Technology, Jiangxi Univ. of Finance and Economics, Nanchang 330013, P. R. China [4]School of Information and Communication Engineering, North Univ. of China, Taiyuan 030051, P. R. China |