Submitted on: 13 January 2004.
Revised on: 12 May 2004.
Accepted on: 04 June 2004.
___________________IET Cyber-Physical Systems: Theory & Applications
Submitted on: 09 December 2006.
Revised on: 27 February 2007.
Accepted on: 20 April 2007.
___________________IET Cyber-Physical Systems: Theory & Applications
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Submitted on: 11 April 2012.
Revised on: 13 June 2012.
Accepted on: 24 June 2012.
___________________IET Cyber-Physical Systems: Theory & Applications
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Submitted on: 05 April 2001.
Revised on: 20 June 2001.
Accepted on: 03 August 2001.
___________________IET Cyber-Physical Systems: Theory & Applications