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Displaying Results 201 - 225 of 10754 on page 9 of 431
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Examining the Barriers to Sustainable Inter-City Transport in Ireland
(2012)
CAULFIELD, BRIAN
Examining the Barriers to Sustainable Inter-City Transport in Ireland
(2012)
CAULFIELD, BRIAN
Abstract:
Over the past decade the Irish government has invested intensively in a large national motorway network. One of the side effects of this investment has been that inter-city travel is now considerably cheaper and quicker by car compared any other mode. The main objective of this research is to identify and examine the barriers to sustainable inter-city transport in Ireland. The majority of sustainable transport research takes place in an urban context with very little research has focused on understanding the factors to encourage alternative modes on inter-city trips. A stated preference study was conducted to determine what are the factors that impact upon individuals? mode choice when conducting an inter-city trip. The results of this paper demonstrate that there are several factors that impact upon individuals? mode choice decisions when undertaking an inter-city trip. The main factor that was found to impact upon mode choice was the requirement to have a car in the destination city.
http://hdl.handle.net/2262/70655
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Bicycle infrastructure preferences - A case study of Dublin
(2012)
CAULFIELD, BRIAN
Bicycle infrastructure preferences - A case study of Dublin
(2012)
CAULFIELD, BRIAN
Abstract:
This paper examines infrastructure preferences for cyclists. While the culture of cycling in the UK and Ireland has experienced some growth over the past decade, particularly in the urban areas, much debate exists as to the most favourable infrastructure types to promote cycling. In Ireland, the Irish National Cycle Policy Framework acknowledges that investment in cycling infrastructure type and quality has been ?in many cases, inadequate? and has, generally, not led to an overall increase in cycling numbers. Therefore, in order to ensure future investment is targeted where it is likely to be most effective in achieving adopted mode share targets for cycling, the following research has been undertaken to determine the factors which most influence cycling route choice. In particular, the research aims to determine the factors, which have greatest influence on cycle route infrastructure preference the correlation between the level of cycling confidence and preferred types of infrastru...
http://hdl.handle.net/2262/70656
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Data Collection and Analysis in a Pan-European Electric Vehicle Fleet
(2013)
O'MAHONY, MARGARET
Data Collection and Analysis in a Pan-European Electric Vehicle Fleet
(2013)
O'MAHONY, MARGARET
Abstract:
Electric vehicles are expected to replace a significant portion of existing light vehicle fleets around the developed world over the coming decades. The technology offers several benefits both on environmental and user levels when compared to traditional combustion engines. As the cost of fossil fuels continue to rise and the price of electromobility drops, this method of transport will become more prevalent. Analysis of early stage electric vehicle usage will allow stakeholders to plan the policy and infrastructure needed to facilitate and manage large scale roll out of the technology. A large collection of electric vehicle fleets and infrastructure networks operating in several European regions are monitored for analysis. The authors present preliminary results showing charging infrastructure utilisation for a range of vehicle and charge point use cases. This initial analysis shows that the usage levels for public infrastructure are low, while home charging is responsible for the ...
http://hdl.handle.net/2262/67856
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A Sensitivity Analysis of a Dynamic Restricted Equilibrium Model to Evaluate Traffic Network Resilience
(2016)
CAULFIELD, BRIAN; O'CONNOR, ALAN
A Sensitivity Analysis of a Dynamic Restricted Equilibrium Model to Evaluate Traffic Network Resilience
(2016)
CAULFIELD, BRIAN; O'CONNOR, ALAN
http://hdl.handle.net/2262/76244
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The effect of workpiece cooling on the machining of biomedical grade polymers
(2014)
ALDWELL, BARRY
The effect of workpiece cooling on the machining of biomedical grade polymers
(2014)
ALDWELL, BARRY
Abstract:
Biomedical grade polymers are commonly used in applications where surface finish and dimensional accuracy are key, such as in t otal joint replacement and intraocular lenses, yet relatively little research has been conducted into the machining of these materials. It has been established that workpiece temperature has a lar ge effect on machinability in soft polymers , with alterations to the chip formation mechanism p ossible when workpiece temperature is adequately controlled. This is due to the change in material behaviour at the glass tran sition temperature, which varies with the composition and crystallinity of the polymer. In polymers which have low glass transition te mperatures, liquid nitrogen cooling is used, in some cases with a control system used to regulate the workpiece temperature during machinin g. This work concentrates on the machining of Ultra High Molecular Weig ht Polyethylene (UHMWPE) workpieces which have been pre - cooled before mach ining. Past ...
http://hdl.handle.net/2262/74777
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Theory of Time-dependent Space-charge-limited Conduction
(2007)
CHAN, HO-KEI
Theory of Time-dependent Space-charge-limited Conduction
(2007)
CHAN, HO-KEI
Abstract:
We have developed a theory of timedependent space-charge-limited conduction in recent years to understand a hysteresis-shift phenomenon of graded ferroelectric films. The theory is a generalization of the conventional steady-state space-charge-limited conduction model to include (i) two carrier types (ptype and n-type), (ii) intrinsic conductivity and (iii) time dependence. Later, the theory was also applied to understand the hysteresis behaviour of homogeneous ferroelectric films. In this paper, a full and updated version of the theory is presented. At the limit of zero intrinsic conductivity, the theory implies the dominance of either carrier type. Accordingly, the independent assumptions of (i) a single carrier type and (ii) a negligible intrinsic conductivity in the conventional steady-state conduction model are interrelated.
http://hdl.handle.net/2262/35850
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Towards Delivering Context-Aware Transportation User Services
(2006)
MEIER, RENE; CAHILL, VINNY; HARRINGTON, ANTHONY CHRISTOPHER
Towards Delivering Context-Aware Transportation User Services
(2006)
MEIER, RENE; CAHILL, VINNY; HARRINGTON, ANTHONY CHRISTOPHER
Abstract:
ITS architectures encourage integration of individual intelligent transportation systems into comprehensive platforms and enable sharing of information across a wide variety of systems and services. This paper presents a spatial programming model that has been designed as part of the iTransIT ITS framework to provide a standardized way to build value-added transportation user services and ultimately to deliver contextual transportation information to users. The spatial programming model is based on a topographical approach to modeling space that enables services to use potentially overlapping spatial context to correlate independently defined distributed information. This programming model has been evaluated by building a context-aware service for multi-modal urban journey planning
http://hdl.handle.net/2262/16507
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Prediction of Emotions from Text using Sentiment Analysis for Expressive Speech Synthesis
(2016)
CABRAL, JOAO
Prediction of Emotions from Text using Sentiment Analysis for Expressive Speech Synthesis
(2016)
CABRAL, JOAO
http://hdl.handle.net/2262/77474
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A 0.5V 0.5mW switching current source oscillator
(2015)
Babaie, Masoud; Shahmohammadi, Mina; Staszewski, Robert Bogdan
A 0.5V 0.5mW switching current source oscillator
(2015)
Babaie, Masoud; Shahmohammadi, Mina; Staszewski, Robert Bogdan
Abstract:
This paper proposes a new RF oscillator topology that is suitable for ultra-low voltage and power applications. By employing alternating current source transistors, the structure combines the benefits of low supply voltage operation of conventional NMOS cross-coupled oscillators together with high current efficiency of the complementary push-pull oscillators. In addition, the 1/f noise upconversion is also reduced. The 40nm CMOS prototype exhibits an average FoM of 189.5 dBc/Hz over 4–5 GHz tuning range, dissipating 0.5mW from 0.5V power supply, while abiding by the technology manufacturing rules.
http://hdl.handle.net/10197/7318
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A 1/f noise upconversion reduction technique applied to class-D and class-F oscillators
(2015)
Shahmohammadi, Mina; Babaie, Masoud; Staszewski, Robert Bogdan
A 1/f noise upconversion reduction technique applied to class-D and class-F oscillators
(2015)
Shahmohammadi, Mina; Babaie, Masoud; Staszewski, Robert Bogdan
Abstract:
The 1/f (flicker) noise upconversion degrades the close-in spectrum of CMOS RF oscillators. The resulting 1/f3 phase noise (PN) can be an issue in PLLs with a loop bandwidth of <;1MHz, which practically implies all cellular phones. A previously published noise-filtering technique [1] and adding resistors in series with gm-device drains [2] have shown significant reduction of the 1/f3 oscillator PN corner. However, the former needs an additional tunable inductor and the latter degrades PN in the 20dB/dec region.
http://hdl.handle.net/10197/7316
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A 12-Channel, real-time near-infrared spectroscopy instrument for brain-computer interface applications
(2008)
Soraghan , C.; Matthews, F.; Markham, Charles; Pearlmutter, Barak A.; O'Neill, R.;...
A 12-Channel, real-time near-infrared spectroscopy instrument for brain-computer interface applications
(2008)
Soraghan , C.; Matthews, F.; Markham, Charles; Pearlmutter, Barak A.; O'Neill, R.; Ward, T.E.
Abstract:
A continuous wave near-infrared spectroscopy (NIRS) instrument for brain-computer interface (BCI) applications is presented. In the literature, experiments have been carried out on subjects with such motor degenerative diseases as amyotrophic lateral sclerosis, which have demonstrated the suitability of NIRS to access intentional functional activity, which could be used in a BCI as a communication aid. Specifically, a real-time, multiple channel NIRS tool is needed to realise access to even a few different mental states, for reasonable baud rates. The 12-channel instrument described here has a spatial resolution of 30mm, employing a flexible software demodulation scheme. Temporal resolution of ~100ms is maintained since typical topographic imaging is not needed, since we are only interested in exploiting the vascular response for BCI control. A simple experiment demonstrates the ability of the system to report on haemodynamics during single trial mental arithmetic tasks. Multiple tr...
http://eprints.maynoothuniversity.ie/1441/
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A 1st year problem-based learning module designed to introduce inteprofessional education for undergraduate students undertaking professional health care programmes.
(2009)
Cusack, T.; Butler, ML.; Blake, C.
A 1st year problem-based learning module designed to introduce inteprofessional education for undergraduate students undertaking professional health care programmes.
(2009)
Cusack, T.; Butler, ML.; Blake, C.
http://hdl.handle.net/10147/129683
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A 2.45/5.8 GHz Folded Monopole Antenna for WLAN Applications
(2012)
Loutridis, Abraham; John, Matthias; Ruvio, Giuseppe; Ammann, Max
A 2.45/5.8 GHz Folded Monopole Antenna for WLAN Applications
(2012)
Loutridis, Abraham; John, Matthias; Ruvio, Giuseppe; Ammann, Max
Abstract:
<p>A probe-fed printed folded monopole antenna for WLAN applications is presented. The antenna operates at 2.45 GHz and 5.8 GHz, is compact and has omni-directional characteristics in both bands. A parametric study of key geometrical parameters is reported.</p>
http://arrow.dit.ie/ahfrccon/34
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A 38 GHz On-Chip Antenna in 28-nm CMOS using Artificial Magnetic Conductor for 5G Wireless Systems
(2016)
Ammann, Max
A 38 GHz On-Chip Antenna in 28-nm CMOS using Artificial Magnetic Conductor for 5G Wireless Systems
(2016)
Ammann, Max
Abstract:
<p>This paper presents the first-ever millimeter wave on-chip antenna (AoC) in 28 nm CMOS technology. The addition of artificial magnetic conductor (AMC) can increase the antenna's power gain and radiation efficiency to -1.75 dBi and 22%, respectively, with an occupied area of 0.95 mm×4.75 mm at 38 GHz. This structure is intended for fully integrated single-chip nanometer CMOS transceivers for 5G communication systems.</p>
http://arrow.dit.ie/engschececon/56
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A 3D visualisation to enhance cognition in software product line engineering
(2009)
Cawley, Ciarán; Botterweck, Goetz; Healy, Patrick; Bin Abid, Saad; Thiel, Steffen
A 3D visualisation to enhance cognition in software product line engineering
(2009)
Cawley, Ciarán; Botterweck, Goetz; Healy, Patrick; Bin Abid, Saad; Thiel, Steffen
Abstract:
Software Product Line (SPL) Engineering is a development paradigm where core artefacts are developed and subsequently configured into different software products dependent on a particular customer's requirements. In industrial product lines, the scale of the configuration (variability management) can become extremely complex and very difficult to manage. Visualisation is widely used in software engineering and has proven useful to amplify cognition in data intensive applications. Adopting this approach within software product line engineering can help stakeholders in supporting essential work tasks by enhancing their understanding of large and complex product lines. In this paper we present our research into the application of visualisation techniques and cognitive theory to address SPL complexity and to enhance cognition in support of the SPL engineering processes. Specifically we present a 3D visualisation approach to enhance stakeholder cognition and thus support variability...
http://hdl.handle.net/10344/2244
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A 3d-printed optical reader for cost-efficient enumeration of cd4 cells for point-of-care diagnostics of hiv in resource-poor settings
(2015)
Glynn, Macdara; Kendlin, Jane; Kinahan, David J.; Ducrée, Jens
A 3d-printed optical reader for cost-efficient enumeration of cd4 cells for point-of-care diagnostics of hiv in resource-poor settings
(2015)
Glynn, Macdara; Kendlin, Jane; Kinahan, David J.; Ducrée, Jens
Abstract:
Here we present a low cost, 3D printed optical reader which is compatible with a disposable, finger actuated chip which can be used for rapid CD4+ enumeration. This portable and widely autonomous device provides the next step in a workflow which can meet the WHO ASSURED requirements for assessment of HIV status in resource-poor settings. The reader is composed of 3D printed parts where the microfluidic chip can be moved along the optical axis of the objective lens for focusing using a screw adapted from a masonry bolt. Performance of the reader shows good agreement with measurements made using a conventional inverted microscope.
http://doras.dcu.ie/20973/
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A 5 year retrospective analysis of the incidence of and risk factors associated with the development of conjugated hyperbilirubinaemia in very low birth weight infants
(2009)
Ahmareen, O; Gibbons, C; Kirkham, C; Corcoran, D
A 5 year retrospective analysis of the incidence of and risk factors associated with the development of conjugated hyperbilirubinaemia in very low birth weight infants
(2009)
Ahmareen, O; Gibbons, C; Kirkham, C; Corcoran, D
Abstract:
IAP Meeting: Abstract 2 May 2009
http://hdl.handle.net/10147/189690
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A 60 GHz 25% tuning range frequency generator with implicit divider based on third harmonic extraction with 182 dBc/Hz FoM
(2015)
Zong, Zhirui; Babaie, Masoud; Staszewski, Robert Bogdan
A 60 GHz 25% tuning range frequency generator with implicit divider based on third harmonic extraction with 182 dBc/Hz FoM
(2015)
Zong, Zhirui; Babaie, Masoud; Staszewski, Robert Bogdan
Abstract:
A 60 GHz frequency generator with implicit ÷3 divider is proposed in this work to improve the system-level efficiency and phase noise. A third-harmonic boosting technique is utilized to simultaneously generate 20GHz and sufficiently strong 60 GHz signals in order to avoid any divider operating at 60 GHz. The prototype is fabricated in 40nm CMOS and exhibits a phase noise of −100 dBc/Hz at 1MHz offset from 60 GHz carrier and 25% tuning range. The phase noise and FoMT (figure-of-merit with tuning range) are improved by 5 dB and 4.6 dB, respectively, compared to state-of-the-art.
http://hdl.handle.net/10197/7285
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A 90nm, Low Power VCO with Reduced KVCO and Sub−band Spacing Variation
(2011)
Collins, Diarmuid; Keady, Aidan; Szczepkowski, Grzegorz; Farrell, Ronan
A 90nm, Low Power VCO with Reduced KVCO and Sub−band Spacing Variation
(2011)
Collins, Diarmuid; Keady, Aidan; Szczepkowski, Grzegorz; Farrell, Ronan
Abstract:
In this paper we present the design of a low power VCO with reduced variations in VCO gain (KVCO) and subband spacing resolution (fres). The proposed VCO is designed using a 90nm CMOS process to cover a tuning range of 23%. Variations in KVCO and fres are reduced by factors of 6 and 17 respectively over a conventional sub-banded VCO, designed using the same process, to meet the same tuning range. This makes the proposed VCO more suited to stable PLL operation with its reduced KVCO requirements resulting in an improvement in phase noise performance over the conventional VCO by 2 dB. Due to the reduced loading on the VCO tank achieved by the presented design, power consumption is kept extremely low at 850 μW from a 1 V supply
http://eprints.maynoothuniversity.ie/3676/
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A audit of the use of PICC lines in preterm infants (<33 weeks) in a tertiary neonatal intensive care unit
(2012)
Nosherwan, A; Gill, I; Walsh, H; Knowles, S; Twomey, A
A audit of the use of PICC lines in preterm infants (<33 weeks) in a tertiary neonatal intensive care unit
(2012)
Nosherwan, A; Gill, I; Walsh, H; Knowles, S; Twomey, A
http://hdl.handle.net/10147/299259
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A Bandwidth Aware Modification to the DSR Routing Protocol for Wireless Mesh Networks
(2009)
Ramadhan, Mustafa; Davis, Mark
A Bandwidth Aware Modification to the DSR Routing Protocol for Wireless Mesh Networks
(2009)
Ramadhan, Mustafa; Davis, Mark
Abstract:
<p>This work proposes a bandwidth aware cross-layer modification to the DSR routing protocol. We include the Access Efficiency Factor (AEF) parameter in addition to the hop-count in the routing discovery mechanism. AEF is a measure to the local availability of bandwidth at a node. Employing the AEF as a metric in the routing discovery mechanism attempts to avoid routing through a congested area in the network. In this modification, we impose a limit on the hop-count in order to control the delay time in the network. The path selection procedure operates by finding a path with the highest minimum AEF value. We have utilized the OPNET modeler simulator to investigate the performance of the modified DSR protocol on a series of randomly generated network topologies of different hopcount limits. The simulator was run twice for each network topology. The first run implemented the standard DSR algorithm while the second implemented the modified DSR protocol. The average global throug...
http://arrow.dit.ie/commcon/36
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A baseline search engine for personal life archives
(2017)
Zhou, Liting; Dang Nguyen, Duc Tien; Gurrin, Cathal
A baseline search engine for personal life archives
(2017)
Zhou, Liting; Dang Nguyen, Duc Tien; Gurrin, Cathal
Abstract:
In lifelogging, as the volume of personal life archive data is ever increasing, we have to consider how to take advantage of a tool to extract or exploit valuable information from these personal life archives. In this work we motivate the need for, and present, a baseline search engine for personal life archives, which aims to make the personal life archive searchable, organizable and easy to be updated. We also present some preliminary results, which illustrate the feasibility of the baseline search engine as a tool for getting insights from personal life archives.
http://doras.dcu.ie/22032/
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A Bayesian approach for estimating characteristic bridge traffic load effects
(2014)
Enright, Bernard; Leahy, Cathal; O'Brien, Eugene J.
A Bayesian approach for estimating characteristic bridge traffic load effects
(2014)
Enright, Bernard; Leahy, Cathal; O'Brien, Eugene J.
Abstract:
This paper investigates the use of Bayesian updating to improve estimates of characteristic bridge traffic loading. Over recent years the use Weigh-In-Motion technologies has increased hugely. Large Weigh-In-Motion databases are now available for multiple sites on many road networks. The objective of this work is to use data gathered throughout a road network to improve site-specific estimates of bridge loading at a specific Weigh-In-Motion site on the network. Bayesian updating is a mathematical framework for combining prior knowledge with new sample data. The approach is applied here to bridge loading using a database of 81.6 million truck records, gathered at 19 sites in the US. The database represents the prior knowledge of loading throughout the road network and a new site on the network is simulated. The Bayesian approach is compared with a non-Bayesian approach, which uses only the site-specific data, and the results compared. It is found that the Bayesian approach significan...
http://hdl.handle.net/10197/7072
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A Bayesian Framework for Recursive Object Removal in Movie Post-Production
(2003)
KOKARAM, ANIL CHRISTOPHER
A Bayesian Framework for Recursive Object Removal in Movie Post-Production
(2003)
KOKARAM, ANIL CHRISTOPHER
Abstract:
peer-reviewed
Some of the most convincing film and video effects are created in digital post-production by removing apparatus that supports or manipulates actors and objects. Wires and people, for instance, can be removed by digitally painting them out of the scene provided some 'clean plate' image is available for pasting in the missing regions. This paper addresses the problem when no such plate is available. Object removal requires the estimation of the motion of the hidden material and then the reconstruction of the missing image data. Using the notion of temporal motion smoothness, this paper articulates the two problems using a Bayesian framework and so develops a unique tool for automated object removal. The tool is currently being tested in the film effects industry and initial feedback is very positive.
http://hdl.handle.net/2262/24565
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A Bayesian method for automatic landmark detection in segmented images
(2005)
WILSON, SIMON PAUL
A Bayesian method for automatic landmark detection in segmented images
(2005)
WILSON, SIMON PAUL
Abstract:
peer-reviewed
The identification of landmark points of a figure in an image plays an important role in many statistical shape analysis techniques. In certain contexts, manual landmark detection is an impractical task and an automated procedure has to be employed instead. Standard corner detectors can be used for this purpose, but this approach is not always suitable, as the set of landmark points best representing the figure is not necessarily limited to corners. We present a Bayesian approach for automatic landmark detection, where a set of N landmark vertices is fitted to the edge of a segmented region of an image. We propose a likelihood function for the observed segmented region given the vertices and then use a Metropolis sampler to sample landmark vertices given the observed region. Careful consideration has to be given to the selection of a prior for the distribution of the landmarks.
http://hdl.handle.net/2262/32987
Displaying Results 201 - 225 of 10754 on page 9 of 431
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