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Submitted on: 02 July 2007.
Revised on: 11 October 2007.
Accepted on: 18 November 2007.
___________________Journal of Sensor and Actuator Networks
Submitted on: 01 June 2014.
Revised on: 12 July 2014.
Accepted on: 03 August 2014.
___________________Journal of Sensor and Actuator Networks
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