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The current state of the art in detecting immediate and long-term railway track problems involves both inspectors walking the track lines and train cars instrumented with accelerometers and ultrasonic sensors that are capable of detecting wear of the rail and breakages. Additionally, a widespread practice of sensing rail continuity by using the tracks to complete simple circuits is in place. In this...
In wireless sensor networks (WSNs), large populations of tiny sensor nodes probe the environment and report the collected data to a base-station(s) for processing. Due to the resource constraints, WSNs pose numerous and non-conventional design challenges compared to contemporary communication networks. One of the performance optimization techniques that have been recently proposed is to dynamically...
We consider the problem of extending the lifetime of wireless sensor networks (WSNs) where sensors report their data to a base station via multi-hop transmission. In-network data aggregation is introduced to reduce the traffic. The lifetime is optimized using a LP (linear programming) framework built on a multicommodity network flow model to which we introduce the concept of flow loss multiplier to...
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