Dept. of Information & Management;
Hunan University of Finance & Economics;
Changsha 410205;
China;
Dept. of Information & Management;
Hunan University of Finance & Economics;
Changsha 410205;
China;
Dept. of Information & Management;
Hunan University of Finance & Economics;
Changsha 410205;
China;
School of Computer & Communication;
Hunan University of Technology;
Zhuzhou Hunan 412008;
China;