Submitted on: 16 February 2008.
Revised on: 13 April 2008.
Accepted on: 03 June 2008.
___________________HUMAN FACTORS---SAGE PUBLICATIONS INC
http://reply.papertrans.cn/2/116/11562/11562-32.png
http://reply.papertrans.cn/2/116/11562/11562-33.png
http://reply.papertrans.cn/2/116/11562/11562-34.png
Submitted on: 27 August 1999.
Revised on: 19 October 1999.
Accepted on: 02 December 1999.
___________________HUMAN FACTORS---SAGE PUBLICATIONS INC
http://reply.papertrans.cn/2/116/11562/11562-36.png