JIANG-YONG SHI1, JIE HE2,+ AND YUE-XIANG YANG1
1School of Computer
National University of Defense Technology
Changsha, 410072 P.R. China
2Department of Information Engineering
Officers College of PAP
Chengdu, 610213 P.R. China
E-mail: {shijiangyong; yyx}@nudt.edu.cn; jack.237@163.com