الفهرس 
BACKGROUNDOnly 14 pages are availabe for public view
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Abstract
In recent years, many applications utilize the benefits of WSNs to provide control to the physical world. In this thesis, we provide a review of the different application areas of WSNs. from these review, we found that some of the main WSNs applications can be categorized as large-scale randomly deployed applications such as environmental monitoring applications. In this type of applications, hundreds of sensors are randomly deployed over the area of interest. The number of deployed nodes and the method of deployment causes the emergence two problems, which are the coverage hole detection problem and the clustering problem. A review for the existing solutions have been shown. We have found that randomness has a great influence on the performance of any of previously proposed solutions. Therefore, we proposed an initial spatial analysis steps which depends on global network information. These steps enable nodes to extract the layout of the deployed network and help in solving the two problems in an efficient manner (in terms of energy).
The organization of the thesis is as follows:
Chapter one shows the definition of WSNs, the challenges found in this area which was the motivations behind this thesis. Then our research objectives are discussed and final contributions are given.
Chapter two starts with a detailed description of the sensor node. After that, a comparison between the WSNs and the traditional wireless networks is shown. Then, the different types of sensor nodes are shown. A list of the main application areas of WSNs is also previewed. Finally, the main issues that has to be considered in the design of WSNs are discussed.
Chapter three shows the definitions and assumptions used in the proposed solutions and the experiments setup. Analysis and discussion for the nature of randomly deployed WSNs is viewed. Then, problems caused by randomness is formulated and our initial spatial analysis steps are proposed.
Chapter four presents a detailed description of the proposed energy efficient technique for solving coverage hole detection problem.
Chapter five shows a detailed description of the proposed energy efficient technique for solving the clustering problem.
Chapter six gives conclusions from the proposed techniques and the future works.