Submitted on: 28 June 2002.
Revised on: 19 October 2002.
Accepted on: 26 November 2002.
___________________Engineering---ELSEVIER
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Submitted on: 30 May 2010.
Revised on: 01 August 2010.
Accepted on: 17 September 2010.
___________________Engineering---ELSEVIER
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Submitted on: 03 June 2011.
Revised on: 27 July 2011.
Accepted on: 02 September 2011.
___________________Engineering---ELSEVIER