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Sensor networks include large number of low cost sensor nodes with small processing capabilities that are deployed over an area in an attempt to do interest sensing task. In this paper we examine the role of very simple and noisy sensors for distributed tracking problem that is one of these tasks. We use a proposed binary sensor model, where each sensor's value is converted reliably to one bit of...
The present paper proposes an architecture for collecting sensing data to build robust wireless sensor networks that are easily manageable by humans and evaluates the proposed architecture through simulations. Under the assumption that sensing data is collected from sensor nodes that have exhausted their batteries, we herein assume that the amount of sensing data that humans can analyze at once and...
Efficiency of the medium access protocol is crucial for wireless sensor networks. For sensor nodes that are battery powered, it is sometimes difficulty or impractical to charge or replace exhausted battery. The sensor nodes collaborate for a common application such as environmental monitoring. The low sensing ranges result in dense networks. The medium access protocol (MAC) for wireless sensor network...
Directional antennas have the potential to enhance the performance of wireless networks. However, exploiting their capabilities requires channel access schemes specifically designed for this purpose. Among the numerous applications of sensor networks, roadside and highway monitoring can benefit from the use of directional antennas due to increased communication ranges between the sensor nodes, reduction...
Infrastructure creation and data dissemination in WSN have traditionally been treated as independent problems. We argue that the two are tightly coupled; the former can expose key structural elements which can be exploited by the latter. This paper proposes the algorithm pair iGroup-iSpread that achieves fast and message-efficient operation by treating the two problems in integrated fashion. Nodes...
TDMA is probably the best choice for an energy efficient multiple access protocol for wireless sensor networks. As such there exist many approaches of increased complexity, using different algorithms and combining information from other layers or multiple access techniques. There are many surveys detailing the protocols and their advantages and disadvantages, but we feel that they don't give a general...
The construction of accurate and efficient visualisations of sense data gathered from wireless sensor networks is an open problem. This paper presents a novel solution in which groups of network nodes cooperate to produce local maps which are cached and merged at a sink node, producing a low- resolution map of the global network. The sink node receives periodic map updates from each cluster-head used...
We present a solution for integrating RFID technology in academic libraries by offering cost effectiveness and good quality of service. On the one hand, we challenge hardware issues which include optimization of the layout of the RFID system by minimizing the total number of used devices, avoiding collision between them and capturing all tags. On other hand, the main challenge in designing powerful...
Recent technological advances in sensors, low power integrated circuits, and wireless communications have enabled the design of low-cost, lightweight, and intelligent physiological sensor nodes. The IEEE 802.15.4 is a new wireless personal area network standard designed for wireless monitoring and control applications. The fast progress of research on energy efficiency in wireless sensor networks,...
Sensor networks have limited resources and often support large-scale applications that need scalable propagation of sensor data to users. We propose a white-board style of communication in sensor networks using a distributed real-time database supporting Virtual Full Replication with Adaptive Segmentation. This allows mobile client nodes to access, transparently and efficiently, any sensor data at...
We present a localized algorithm (LTCA) for topology control in wireless sensor networks which has certain desirable properties. First, the algorithm is very simple, strictly local (requires 1-hop information of neighbors) and fast, requiring each node to communicate with its neighbors exactly twice. Second, LTCA does not assume the underlying graph to be a unit disk graph, and in fact works on general...
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