1. School of Management and Economics, University of Electronic Science and Technology of China, Chengdu 611731, China. (e-mail:httcyl@126.com)
2. Department of Electrical Engineering, Yeungnam University, Kyongsan 38541, Republic of Korea.
3. Department of Applied Mathematics Faculty of Mathematics, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
4. School of Management and Economics, University of Electronic Science and Technology of China, Chengdu 611731, China. (e-mail:hezh@uestc.edu.cn)
5. School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.