http://reply.papertrans.cn/2/192/19142/19142-31.png
http://reply.papertrans.cn/2/192/19142/19142-32.png
http://reply.papertrans.cn/2/192/19142/19142-33.png
http://reply.papertrans.cn/2/192/19142/19142-34.png
http://reply.papertrans.cn/2/192/19142/19142-35.png
Submitted on: 07 February 1998.
Revised on: 22 May 1998.
Accepted on: 06 July 1998.
___________________JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY