Authors
Kaijun Wang
School of Computer Science and Engineering, Xidian University, Xian 710071, P. R. China.
Junying Zhang
School of Computer Science and Engineering, Xidian University, Xian 710071, P. R. China.
Lixin Guo
Dept of Computer Science, Xian Institute of Post-telecommunications, Xian 710061, P. R. China.
Chongyang Tu
School of Computer Science and Engineering, Xidian University, Xian 710071, P. R. China.
