This Special Issue captures a significant portion of the current sensors research excellence in I... more This Special Issue captures a significant portion of the current sensors research excellence in Ireland [...]
A hybrid methodology is proposed for use in low power, safety critical wireless sensor network ap... more A hybrid methodology is proposed for use in low power, safety critical wireless sensor network applications, where quality of service orientated transceiver output power control is required to operate in parallel with radio frequency based localisation. The practical implementation is framed in an experimental procedure designed to track a moving agent in a realistic indoor environment. An adaptive time synchronised approach is employed to ensure the positioning technique can operate effectively in the presence of dataloss and where the transmitter output power of the mobile agent is varying due to power control. A deterministic multilateration based positioning approach is adopted and accuracy is improved by filtering signal strength measurements overtime to account for multipath fading. The location estimate is arrived at by employing least square estimation. Power control is implemented at two separate levels in the network topology. Firstly power control is applied to the uplink...
The origins of sub-Ferromagnetic Resonance (FMR) multimodal behavior in the magnetic susceptibili... more The origins of sub-Ferromagnetic Resonance (FMR) multimodal behavior in the magnetic susceptibility spectrum of amorphous CoZrTaB magnetic thin films are investigated using Brown's diffusion model describing continuous diffusion of magnetic spins. Brown's diffusion model is regressed onto experimental data for the amorphous CoZrTaB magnetic thin films with thicknesses spanning 80–530 nm. The mathematical model presented successfully reproduces the thickness dependent dynamic magnetic susceptibility of the amorphous CoZrTaB magnetic thin films with strong statistical significance. The model proposes the formation of additional energy wells in the uniaxial anisotropy energy plane of the material after a critical film thickness. The sub-FMR resonance peaks arise when the frequency of the external excitation field approaches the natural frequency of the well. Furthermore, the additional energy wells in the anisotropy energy plane cause a breakdown in the axial symmetry of the an...
32nd IEEE Conference on Local Computer Networks (LCN 2007), 2007
The implementation of the Water Framework Directive (WFD) across the EU, and the growing internat... more The implementation of the Water Framework Directive (WFD) across the EU, and the growing international emphasis on the management of water quality is giving rise to an expanding market for novel, miniaturized, intelligent monitoring systems for freshwater catchments, transitional and coastal waters. This paper describes the "SmartCoast" Multi Sensor System for water quality monitoring. This system is aimed at providing
This paper focuses on the development of miniaturised modular wireless sensor networks that can b... more This paper focuses on the development of miniaturised modular wireless sensor networks that can be used to realise distributed autonomous sensors for future ad-hoc networks in the ambient systems and intelligent environments arena. Such modular, ...
This Special Issue captures a significant portion of the current sensors research excellence in I... more This Special Issue captures a significant portion of the current sensors research excellence in Ireland [...]
A hybrid methodology is proposed for use in low power, safety critical wireless sensor network ap... more A hybrid methodology is proposed for use in low power, safety critical wireless sensor network applications, where quality of service orientated transceiver output power control is required to operate in parallel with radio frequency based localisation. The practical implementation is framed in an experimental procedure designed to track a moving agent in a realistic indoor environment. An adaptive time synchronised approach is employed to ensure the positioning technique can operate effectively in the presence of dataloss and where the transmitter output power of the mobile agent is varying due to power control. A deterministic multilateration based positioning approach is adopted and accuracy is improved by filtering signal strength measurements overtime to account for multipath fading. The location estimate is arrived at by employing least square estimation. Power control is implemented at two separate levels in the network topology. Firstly power control is applied to the uplink...
The origins of sub-Ferromagnetic Resonance (FMR) multimodal behavior in the magnetic susceptibili... more The origins of sub-Ferromagnetic Resonance (FMR) multimodal behavior in the magnetic susceptibility spectrum of amorphous CoZrTaB magnetic thin films are investigated using Brown's diffusion model describing continuous diffusion of magnetic spins. Brown's diffusion model is regressed onto experimental data for the amorphous CoZrTaB magnetic thin films with thicknesses spanning 80–530 nm. The mathematical model presented successfully reproduces the thickness dependent dynamic magnetic susceptibility of the amorphous CoZrTaB magnetic thin films with strong statistical significance. The model proposes the formation of additional energy wells in the uniaxial anisotropy energy plane of the material after a critical film thickness. The sub-FMR resonance peaks arise when the frequency of the external excitation field approaches the natural frequency of the well. Furthermore, the additional energy wells in the anisotropy energy plane cause a breakdown in the axial symmetry of the an...
32nd IEEE Conference on Local Computer Networks (LCN 2007), 2007
The implementation of the Water Framework Directive (WFD) across the EU, and the growing internat... more The implementation of the Water Framework Directive (WFD) across the EU, and the growing international emphasis on the management of water quality is giving rise to an expanding market for novel, miniaturized, intelligent monitoring systems for freshwater catchments, transitional and coastal waters. This paper describes the "SmartCoast" Multi Sensor System for water quality monitoring. This system is aimed at providing
This paper focuses on the development of miniaturised modular wireless sensor networks that can b... more This paper focuses on the development of miniaturised modular wireless sensor networks that can be used to realise distributed autonomous sensors for future ad-hoc networks in the ambient systems and intelligent environments arena. Such modular, ...
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Papers by Cian O'Mathuna