http://reply.papertrans.cn/2/166/16545/16545-31.png
Submitted on: 14 October 2006.
Revised on: 10 January 2007.
Accepted on: 27 February 2007.
___________________Journal of Enabling Technologies
http://reply.papertrans.cn/2/166/16545/16545-33.png
http://reply.papertrans.cn/2/166/16545/16545-34.png
Submitted on: 07 November 2001.
Revised on: 31 January 2002.
Accepted on: 24 February 2002.
___________________Journal of Enabling Technologies
Submitted on: 12 August 1998.
Revised on: 22 October 1998.
Accepted on: 19 November 1998.
___________________Journal of Enabling Technologies