Submitted on: 26 November 2009.
Revised on: 06 February 2010.
Accepted on: 10 March 2010.
___________________Journal of Control Automation and Electrical Systems
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Submitted on: 26 March 2003.
Revised on: 22 April 2003.
Accepted on: 28 May 2003.
___________________Journal of Control Automation and Electrical Systems
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Submitted on: 14 July 1998.
Revised on: 07 November 1998.
Accepted on: 18 November 1998.
___________________Journal of Control Automation and Electrical Systems
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Submitted on: 06 July 2005.
Revised on: 08 September 2005.
Accepted on: 22 October 2005.
___________________Journal of Control Automation and Electrical Systems