出处
《通讯和计算机(中英文版)》
2008年第5期16-20,共5页
Journal of Communication and Computer
基金
Acknowledgments: This work is supported by the National Science Foundation of China (No. 90604017), the Open Foundation of CAS Key Laboratory for Intelligent Information Processing (No. 11P2006-3) and the Education Innovation Foundation of Jiangxi (No. JXJG-06-1-47).