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In Wireless Sensor Networks (WSNs), the nodes mobility model determines the network functionality which strongly influences the network lifetime, coverage and the energy consumption as well. So, the mobility strategy choice is very important in several critical application areas. The present paper proposes a mobility model that respects the network coverage while efficiently managing the spent energy...
Directional Sensor Network (DSNs) being a subdivision of WSN has attracted researchers a lot due to its wide deployment in visual monitoring applications as the continuous technical advancements have enabled us making use of low-cost camera sensors. But because of the inherent random deployment of these camera sensors, the effective area coverage is reduced. Therefore, the effective area coverage...
The positioning of sensors in Wireless Sensor Networks WSNs affect coverage, communication cost and resource management. The effectiveness of these networks is determined to a large extent by the coverage provided by the sensor deployment. Coverage is an important optimization objective in WSN deployments. Sensor positioning alludes to the capabilities of WSNs to ‘adapt’ and ‘respond’, in order to...
Wireless sensor networks (WSNs) have been increasingly available for critical applications such as security surveillance and environmental monitoring. An important performance measure of such applications is sensing coverage that characterizes how well a sensing field is monitored by a network. Although advanced collaborative signal processing algorithms have been adopted by many existing WSNs, most...
Provisioning the network with sufficient lifetime is a key requirement in many sensor network applications. In order to save energy in densely deployed sensor network often a subset of so called redundant nodes periodically kept off while the other nodes in the vicinity working on behalf of the sleeping nodes. Preserving the adequate communication and sensing coverage throughout the entire network...
The recent advances in radio and embedded system technologies have enabled the proliferation of wireless microsensor networks. Such wirelessly connected sensors are released in many diverse environments to perform various monitoring tasks. The effectiveness of these networks is determined to a large extent by the coverage provided by the sensor deployment. The positioning of sensors affect coverage,...
This paper proposes self-deploying approaches for sensor networks. The gravitational field (GF) and the radioactive decay (RD) are used to model the repulsion forces between sensor nodes. The Received Signal Strength (RSS) is transformed to the repulsion force for computing the next move distance and direction. The GF approach reduces the power consumption on communication overheads while the RD approach...
Wireless sensor networks have recently emerged as one of the hottest research fields. Sensor coverage, in general answers the question about the quality of service (QoS) that can be provided by a particular sensor network. This paper presents a density mobility scheme (DMS) which can improve the system coverage by moving the nodes to its nearby coverage hole it detects. In the DMS, a mobile sensor...
In this paper, we consider the issue of angular mobility assisted coverage enhancement in directional camera sensor networks. In our model, each sensor can visually capture (i.e. sense) events within a sector in its field of view, and can also rotate about a fixed axis to enhance its coverage. The problem we particularly address is how to enhance blanket coverage leveraging angular mobility of the...
Wireless sensor networks (WSN) have recently achieved a great deal of attention due to its numerous attractive applications in many different fields. The focus of monitoring application is to acquire and verify information about enemy capabilities and positions of hostile targets. Monitoring applications related to security and reliability requires guaranteed k-coverage of the area at all times. A...
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