Yikun Zhang Peng Yin Du-Wu Cui Hui Xia 211-214 2007 conf/compsac/2007 COMPSAC (1) http://doi.ieeecomputersociety.org/10.1109/COMPSAC.2007.28 db/conf/compsac/compsac2007-1.html#ZhangYCX07