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Recent advances in Micro-Electro-Mechanical Systems§(MEMS) and low-power short-range radios have enabled§rapid development of wireless sensor networks. §Future sensor networks are anticipated to include§hundreds or thousands of these devices in many§applications, such as capturing multimedia content§for surveillance, structural health monitoring,§tracking of accidental chemical leaks, machine§failures, earthquakes and intrusion detection. §With the increase of sensor applications, a number of§challenging problems related to the network protocol§design have emerged - the most important ones§relating to scalability, energy efficiency and§lifetime maximisation. Techniques devised for sensor§networks should be scalable to deal with a large§number of sensors distributed in the field. Wireless§sensor nodes are deployed with limited energy§reserves, so the networks should operate with minimum§energy overhead. In fact, the network should take§into account not only individual node s energy§efficiency but also consider the global picture,§because surviving nodes energy reserves in a failed§network are wasted energy.