XIAO-QING LIN1,3, ZONG-MIN MA2,+ AND LI YAN2
1School of Computer Science and Engineering
Northeastern University
Shenyang, Liaoning, 110819 P.R. China
2College of Computer Science and Technology
Nanjing University of Aeronautics and Astronautics
Nanjing, Jiangsu, 211106 P.R. China
3School of Information Engineering
Eastern Liaoning University
Dandong, Liaoning, 118003 P.R. China