Submitted on: 24 September 2001.
Revised on: 03 January 2002.
Accepted on: 21 February 2002.
___________________eTransportation---ELSEVIER
Submitted on: 30 January 2000.
Revised on: 15 April 2000.
Accepted on: 08 May 2000.
___________________eTransportation---ELSEVIER
Submitted on: 04 January 2004.
Revised on: 20 March 2004.
Accepted on: 30 April 2004.
___________________eTransportation---ELSEVIER
http://reply.papertrans.cn/1/90/8959/8959-24.png
http://reply.papertrans.cn/1/90/8959/8959-25.png
Submitted on: 31 May 2001.
Revised on: 20 July 2001.
Accepted on: 26 August 2001.
___________________eTransportation---ELSEVIER
http://reply.papertrans.cn/1/90/8959/8959-27.png
http://reply.papertrans.cn/1/90/8959/8959-28.png
Submitted on: 03 March 2020.
Revised on: 27 March 2020.
Accepted on: 09 May 2020.
___________________eTransportation---ELSEVIER
Submitted on: 08 December 2000.
Revised on: 21 February 2001.
Accepted on: 22 March 2001.
___________________eTransportation---ELSEVIER