Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 369 for “"Wireless sensor networks"”.
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Clustered wireless sensor networks
The study of topology in randomly deployed wireless sensor networks (WSNs) is important in addressing the fundamental issue of stochastic coverage resulting from randomness in the deployment procedure and power management algorithms. This dissertation defines and studies clustered WSNs, WSNs whose …
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Cognitive wireless sensor networks (CogWSNs)
Cognitive Wireless Sensor Networks (CogWSNs) are an adaptive learning based wireless sensor network relying on cognitive computational processes to provide a dynamic capability in configuring the network. The network is formed by sensor nodes equipped with cognitive modules with awareness of their …
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Distributed beamforming in wireless sensor networks
… to study the effectiveness of beamforming using sensor clusters for establishing a communication link to the UAV. Results showed that the antenna main lobe remained relatively unchanged in the presence of position errors and sensor node failures or when the density of the sensor nodes changed. …
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Towards Real-time Wireless Sensor Networks
Wireless sensor networks are poised to change the way computer systems interact with the physical world. We plan on entrusting sensor systems to collect medical data from patients, monitor the safety of our infrastructure, and control manufacturing processes in our factories. To date, the focus of …
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Intrusion Detection In Wireless Sensor Networks
There are several applications that use sensor motes and researchers continue to explore additional applications. For this particular application of detecting the movement of humans through the sensor field, a set of Berkley mica2 motes on TinyOS operating system is used. Different sensors such as …
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Decentralised control of wireless sensor networks
Wireless sensor networks are receiving a considerable degree of research interest due to their deployment in an increasing number and variety of applications. However, the efficient management of the limited energy resources of such networks in a way that maximises the information value of the data …
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Application framework for wireless sensor networks [thesis]
Wireless Sensor Networks (WSNs) are based on innovative technologies that had revolutionized the methods in which we interact with the environment; i.e., through sensing the physical (e.g., fire motion, contact) and chemical (e.g., molecular concentration) properties of the natural surroundings. …
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Wireless sensor networks and their industrial applications
Wireless Sensor Networks (WSN) represent a relatively modern concept which has captured the interest of many in the research community. Coupled with appropriate hardware, they offer great flexibility in terms of their applicability to solving real world problems. This can be seen with applications …
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Distributed Operating Systems on Wireless Sensor Networks
… techniques that are adapted and applied to the wireless sensor network domain. These techniques are applied to the creation of a wireless sensor network operating system that allows complex applications to be created without special programmer knowledge of sensor network programming or …
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RESTORING CONNECTIVITY IN PARTITIONED WIRELESS SENSOR NETWORKS
The sensor nodes in Wireless Sensor Networks (WSNs) and Mobile Sensor Networks (MSNs) can be prone to failures due to limited resources and/or the harsh environments where they are deployed. The network may be subject to partitioning if such failures are experienced by the cut-vertex nodes in the …
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ROUTING TOPOLOGY RECOVERY FOR WIRELESS SENSOR NETWORKS
… December 2014. Routing Topology Recovery for Wireless Sensor Networks. Major Professor: Yao Liang.
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Distributed synchronization algorithms for wireless sensor networks
… to carry out complex cooperative tasks. In a wireless sensor network (WSN), time/frequency synchronization allows the implementation of distributed signal processing and coding techniques, and the realization of coordinated access to the shared wireless medium. Large multi-hop WSN's constitute …
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Computational intelligence methods in wireless sensor networks
<p>"Wireless sensor networks (WSNs) are networks of autonomous nodes that sense, compute and communicate in order to monitor an environment collectively. Ad hoc deployment, dynamic environment and resource constraints in nodes need to be considered while addressing WSN challenges such as …
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Novel security mechanisms for wireless sensor networks
Wireless Sensor Networks (WSNs) are used for critical applications such as health care, traffic management or plant automation. Thus, we depend on their availability, and reliable, resilient and accurate operation. It is therefore essential that these systems are protected against attackers who may …
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Geometric Graph Theory and Wireless Sensor Networks
… to explore a variety of problems motivated by wireless sensor networks. Imagine sensors capable of communicating along straight lines except through obstacles like buildings or barriers, such that the communication network topology of the sensors is their visibility graph. Using a standard …
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Batteryless RF transceiver for wireless sensor networks
Wireless sensor network (WSN) is a fast growing research area which has attracted considerable attentions both in industrial and academic environments in the last few years. In this work a complete RF transceiver for WSN applications is presented, which includes a RF energy harvesting system, a …
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Understanding Performance Limits in Wireless Sensor Networks
… chosen source and destination in a random wireless network. We prove both an upper bound and a lower bound of the minimum transporting energy. We also show several results of network transport capacity based on the findings.
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In -Network Computation in Wireless Sensor Networks
Next, we study another important metric in sensor networks, which is network lifetime. We consider a formulation of maximizing network lifetime given the simple task of downloading different quantities of data over nodes with different energy levels. We reduce the problem of choosing lifetime …
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Clock Synchronization for Multihop Wireless Sensor Networks
In wireless sensor networks, more so generally than in other types of distributed systems, clock synchronization is crucial since by having this service available, several applications such as media access protocols, object tracking, or data fusion, would improve their performance. In this …
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