Submitted on: 31 October 2010.
Revised on: 13 February 2011.
Accepted on: 28 March 2011.
___________________IISE Transactions on Occupational Ergonomics & Human Factors
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Submitted on: 30 August 2008.
Revised on: 05 December 2008.
Accepted on: 25 December 2008.
___________________IISE Transactions on Occupational Ergonomics & Human Factors
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