Corresponding Author

Paper:	idn243
Name:	J. Xia
Company:	Engineering University of Air Force
Address:	Feng gao Road n.1 Xian, 710077
Country:	P. R. China
Phone:	+86 24 2399 1766
Fax:	+86 24 2389 1977
Email:	mcgmzwzc@pub.ln.cninfo.net