1Introduction

Sensors have been in use for a very long time in traditional applications. These applications include touch-sensitive sensors on buttons of microwaves and elevators, motion detector sensors which turn lights on and off, smoke detector sensors, etc. With advances in electronics and communication technology sensors are now being used in many new applications which were not even considered only a decade back. Particularly, due to rapid development of wireless networks, it has been possible to deploy a network of sensors spread over a large geographical area to allow sensor devices communicating wire-lessly to gather huge volume of data for use in several new applications which had not been envisioned earlier.

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