1. School of Mathematics and Computer Science, Nanchang University, Nanchang, China
2. School of Computer and Information Engineering, Henan University, Kaifeng, China
3. School of Software and the Henan International Joint Laboratory of Intelligent Network Theory and Key Technology, Henan University, Kaifeng, China
4. School of Software, Nanchang University, Nanchang, China
5. Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA, USA