http://reply.papertrans.cn/1/63/6225/6225-11.png
http://reply.papertrans.cn/1/63/6225/6225-12.png
Submitted on: 28 July 2002.
Revised on: 05 October 2002.
Accepted on: 27 November 2002.
___________________COMPUTER COMMUNICATIONS---ELSEVIER
Submitted on: 02 February 1998.
Revised on: 12 March 1998.
Accepted on: 08 April 1998.
___________________COMPUTER COMMUNICATIONS---ELSEVIER
Submitted on: 21 June 2000.
Revised on: 05 September 2000.
Accepted on: 27 October 2000.
___________________COMPUTER COMMUNICATIONS---ELSEVIER
Submitted on: 12 October 2003.
Revised on: 13 November 2003.
Accepted on: 21 December 2003.
___________________COMPUTER COMMUNICATIONS---ELSEVIER
Submitted on: 05 April 1999.
Revised on: 12 May 1999.
Accepted on: 26 May 1999.
___________________COMPUTER COMMUNICATIONS---ELSEVIER
http://reply.papertrans.cn/1/63/6225/6225-18.png
Submitted on: 24 June 2013.
Revised on: 03 October 2013.
Accepted on: 14 November 2013.
___________________COMPUTER COMMUNICATIONS---ELSEVIER
http://reply.papertrans.cn/1/63/6225/6225-20.png