Submitted on: 03 March 2003.
Revised on: 31 May 2003.
Accepted on: 28 July 2003.
___________________International Journal of Critical Infrastructure Protection
http://reply.papertrans.cn/2/133/13237/13237-32.png
http://reply.papertrans.cn/2/133/13237/13237-33.png
http://reply.papertrans.cn/2/133/13237/13237-34.png
http://reply.papertrans.cn/2/133/13237/13237-35.png
Submitted on: 15 April 1999.
Revised on: 02 June 1999.
Accepted on: 18 June 1999.
___________________International Journal of Critical Infrastructure Protection