1. College of Economics, Central South University of Forestry and Technology, Changsha 410004, China
2. Faculty of Engineering, University of Toyama, Toyama 930-8555, Japan
3. College of Computer Science and Software Engineering, Shenzhen University, Shenzhen 518060, China
4. School of Electrical and Computer Engineering, Kanazawa University, Kanazawa-shi 920-1192, Japan