Eoin O'Connell

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This work presents the design and evaluation of the REAM (Remote Electricity Actuation and Monitoring) node based around the modular Tyndall Mote platform. The REAM node enables the user to remotely actuate power to a mains power extension board while sampling the current, voltage, power and power factor of the attached load. The node contains a current(More)
To provide a strong security service in Wireless Sensor Networks (WSNs), cryptographic mechanisms are required. Generally these security mechanisms demand intensive use of limited resource, such as memory, and energy to provide a defense against attacks. Monitoring the behavior of nodes and detecting risks according to these behaviors, and then taking(More)
There has been a significant increase in the proliferation and implementation of Wireless Sensor Networks (WSNs) in different disciplines, including the monitoring of maritime environments, healthcare systems, and industrial sectors. It has now become critical to address the security issues of data communication while considering sensor node constraints.(More)
Functionalisation of two-dimensional (2-D) materials via low energy ion implantation could open possibilities for fabrication of devices based on such materials. Nanoscale patterning and/or electronically doping can thus be achieved, compatible with large scale integrated semiconductor technologies. Using atomic resolution High Angle Annular Dark Field(More)
The system presented in this paper demonstrates how a novel fibre optic based sensor, capable of detecting minute changes in the level of impurity in a liquid, can be incorporated onto a Mote based platform and all for a relatively low cost. It will be demonstrated how these features can be used to detect increases in the level of hydrocarbons within a(More)
To achieve extended low-power operation in multi-hop Wireless Sensor Networks, networked nodes are often radio duty cycled to decrease power consumption incurred by energy intensive modes of the wireless transceiver. These nodes, spending the majority of their lifetime in a `sleep' state, can introduce large latencies into data transmission and reception.(More)
This work demonstrates ultra-low power, reliable communication in wireless sensor networks. Using simple loose time synchronisation, optimised CSMA, effective management of turnaround-times and clock drift, we demonstrate significant performance improvements over the existing art. Extensive modelling, implementation and empirical comparative evaluation are(More)
The system presented in this paper demonstrates how a novel fiber optic based sensing platform, capable of detecting minute changes in the level of impurity in a liquid, can be incorporated onto a Mote-based platform enabling real time monitoring of a body of water. How these features can be used to detect representative samples, such as hydrocarbons and(More)
Handling the security in Wireless Sensor Networks (WSNs) requires cryptographic mechanisms to detect faulty and unstable nodes that lead to the inactivity of network during packet travelling. Although, cryptographic security mechanism operations demand a high calculation of computational time and memory resources, while the sensor nodes have low memory and(More)
Research into an early warning harmful algae bloom (HAB) sensing system for use in underwater monitoring applications is presented. The sensor proposed by the authors utilises principal component analysis (PCA) to establish the complex linkages between ocean colour, absorption and scattering, algae pigmentation and cell size, along with depth of bloom(More)