出处
《通讯和计算机（中英文版）》
2007年第5期1-7,共7页
Journal of Communication and Computer
基金
Acknowledgements： This work is supported in part by the National Natural Science Foundation of China （No. 60503020）, the Natural Science Research Plan for Jiangsu High School （No 05KJD520151）, and 0pening Foundation of Jiangsu Key Laboratory of Computer Information Processing Technology in Soochow University, Guangxi Natural Science Foundation of China （No. 0542036）.
