1. Institute of Information Resource Management, School of Information Technology, Jiangxi University of Finance and Economics, No. 169, East Shuanggang Road, Changbei, Nanchang, Jiangxi 330013, China
2. Department of Computer Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea
3. School of Business and Administration, Jiangxi University of Finance and Economics, No. 169, East Shuanggang Road, Changbei, Nanchang, Jiangxi 330013, China