1. Cluster and Grid Computing Lab, Services Computing Technology and System Lab, Big Data Technology and System Lab, School of Cyber Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
2. College of Business, The University of Texas at San Antonio, TX 78249, USA
3. College of Engineering and Applied Science, University of Colorado Springs, CO 80918, USA
4. Cyber-Physical-Social Systems and Security Lab, School of Cyber Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
5. Cluster and Grid Computing Lab, Services Computing Technology and System Lab, Big Data Technology and System Lab, School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, P. R. China