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Displaying Results 1 - 25 of 480 on page 1 of 20
Marked
Mark
-ing words in RBMT: multilingual evaluation and exploration of pre- and post-processing solutions
(2010)
Aranberri Monasterio, Nora
-ing words in RBMT: multilingual evaluation and exploration of pre- and post-processing solutions
(2010)
Aranberri Monasterio, Nora
Abstract:
This PhD dissertation falls within the domain of machine translation and it specifically focuses on the machine translation of IT-domain -ing words into four target languages: French, German, Japanese and Spanish. Claimed to be problematic due to their linguistic flexibility, i.e. -ing words can function as nouns, adjectives and verbs, this dissertation investigates how problematic -ing words are and explores possible solutions for improvement of their MT output. A corpus-based approach for a better representation of the domain-specific structures where -ing words occur is used. After selecting a significant sample, the -ing words are classified following a functional categorisation presented by Izquierdo (2006). The sample is machine-translated using a customised RBMT system. A feature-based human evaluation is then performed in order to obtain information about the specific feature under study. The results showed that 73% of the -ing words were correctly translated in terms of gra...
http://doras.dcu.ie/15093/
Marked
Mark
2D distinct element modeling of the structure and growth of normal faults in multilayer sequences : 1. Model calibration, boundary conditions, and selected results
(2007)
Schöpfer, Martin P. J.; Childs, Conrad; Walsh, John J.
2D distinct element modeling of the structure and growth of normal faults in multilayer sequences : 1. Model calibration, boundary conditions, and selected results
(2007)
Schöpfer, Martin P. J.; Childs, Conrad; Walsh, John J.
Abstract:
The distinct element method is used for modeling the growth of normal faults in layered sequences. The models consist of circular particles that can be bonded together with breakable cement. Size effects of the model mechanical properties were studied for a constant average particle size and various sample widths. The study revealed that the bulk strength of the model material decreases with increasing sample size. Consequently, numerical lab tests and the associated construction of failure envelopes were performed for the specific layer width to particle diameter ratios used in the multilayer models. The normal faulting models are composed of strong layers (bonded particles) and weak layers (nonbonded particles) that are deformed in response to movement on a predefined fault at the base of the sequence. The modeling reproduces many of the geometries observed in natural faults, including (1) changes in fault dip due to different modes of failure in the strong and weak layers, (2) fa...
http://hdl.handle.net/10197/3033
Marked
Mark
A Bayesian approach to comparing theoretic models to observational data: A case study from solar flare physics
(2011)
GALLAGHER, PETER THOMAS
A Bayesian approach to comparing theoretic models to observational data: A case study from solar flare physics
(2011)
GALLAGHER, PETER THOMAS
Abstract:
Solar flares are large-scale releases of energy in the solar atmosphere, which are characterized by rapid changes in the hydrodynamic properties of plasma from the photosphere to the corona. Solar physicists have typically attempted to understand these complex events using a combination of theoretical models and observational data. From a statistical perspective, there are many challenges associated with making accurate and statistically significant comparisons between theory and observations, due primarily to the large number of free parameters associated with physical models. This class of ill-posed statistical problem is ideally suited to Baysian methods. In this paper, the solar flare studied by Raftery et al. (2008) is reanalysed using a Baysian framework. This enables us to study the evolution of the flare's temperature, emission measure and energy loss in a statistically self-consistent manner. The Baysian-based techniques confirm that both conductive and non-thermal bea...
http://hdl.handle.net/2262/59497
Marked
Mark
A combined audio-visual contribution to event detection in field sports broadcast video. Case study: Gaelic football
(2003)
Sadlier, David A.; O'Connor, Noel E.; Marlow, Seán; Murphy, Noel
A combined audio-visual contribution to event detection in field sports broadcast video. Case study: Gaelic football
(2003)
Sadlier, David A.; O'Connor, Noel E.; Marlow, Seán; Murphy, Noel
Abstract:
In this paper we propose novel, audio-visual analysis techniques for event detection in broadcast TV sports video content. The scope of the design is constrained to the specialized domain of 'field sport', and specifically, Gaelic Football is presented as an experimental case study. We show that a combination of speech-band energy tracking in the audio domain, coupled with colour dominance pattern recognition in the video domain, provides a useful contribution to event detection for broadcast Gaelic Football matches. It is projected that, any conclusions made therein may be extended such that they function on sports content of a similar nature such as American Football, Australian Rules, Rugby Union etc.
http://doras.dcu.ie/244/
Marked
Mark
A Comparison of Ensemble and Case-Base Maintenance Techniques for Handling Concept Drift in Spam Filtering
(2005)
Delany, Sarah Jane; Cunningham, Pádraig; Tsymbal, Alexey
A Comparison of Ensemble and Case-Base Maintenance Techniques for Handling Concept Drift in Spam Filtering
(2005)
Delany, Sarah Jane; Cunningham, Pádraig; Tsymbal, Alexey
Abstract:
TCD-CS-2005-19
The problem of concept drift has recently received considerable attention in machine learning research. One important practical problem where concept drift needs to be addressed is spam filtering. The literature on concept drift shows that among the most promising approaches are ensembles and a variety of techniques for ensemble construction has been proposed. In this paper we consider an alternative lazy learning approach to concept drift whereby a single case-based classifier for spam filtering keeps itself up-to-date through a case-base maintenance protocol. We present an evaluation that shows that the case-base maintenance approach is more effective than a variety of ensemble techniques. The evaluation is complicated by the overriding importance of False Positives (FPs) in spam filtering. The ensemble approaches can have very good performance on FPs because it is possible to bias an ensemble more strongly away from FPs than it is to bias the single classifer. ...
http://hdl.handle.net/2262/13439
Marked
Mark
A comparison of score, rank and probability-based fusion methods for video shot retrieval
(2005)
McDonald, Kieran; Smeaton, Alan F.
A comparison of score, rank and probability-based fusion methods for video shot retrieval
(2005)
McDonald, Kieran; Smeaton, Alan F.
Abstract:
It is now accepted that the most effective video shot retrieval is based on indexing and retrieving clips using multiple, parallel modalities such as text-matching, image-matching and feature matching and then combining or fusing these parallel retrieval streams in some way. In this paper we investigate a range of fusion methods for combining based on multiple visual features (colour, edge and texture), for combining based on multiple visual examples in the query and for combining multiple modalities (text and visual). Using three TRECVid collections and the TRECVid search task, we specifically compare fusion methods based on normalised score and rank that use either the average, weighted average or maximum of retrieval results from a discrete Jelinek-Mercer smoothed language model. We also compare these results with a simple probability-based combination of the language model results that assumes all features and visual examples are fully independent.
http://doras.dcu.ie/269/
Marked
Mark
A computational model of counterfactual thinking: The temporal order effect
(2001)
BYRNE, RUTH MARY JOSEPHINE
A computational model of counterfactual thinking: The temporal order effect
(2001)
BYRNE, RUTH MARY JOSEPHINE
Abstract:
People generate counterfactual alternatives to realitywhen they think about how things might have happeneddifferently, 'if only…'. There are considerableregularities in the sorts of past events that peoplementally undo, for example, they tend to mentally undothe most recent event in an independent sequence.Consider a game in which two contestants will win£1000 if they both pick cards from the same color suite.The first player picks black and the second red and theylose. Most people spontaneously undo the outcome bythinking, if only the second player had picked black. Wedescribe a computational model that simulates our theoryof the mental representations and cognitive processesunderlying this temporal order effect. The computermodel is corroborated by tests of the novel predictions ofour theory: it should be possible to reverse the temporalorder effect by manipulating the way in which thewinning conditions are described.
http://hdl.handle.net/2262/39493
Marked
Mark
A demonstration of wireless sensing for long-term monitoring of water quality
(2009)
Regan, Fiona; Lawlor, Antoin; O'Flynn, Brendan; Torres, J; Martínez-Català, Rafael...
A demonstration of wireless sensing for long-term monitoring of water quality
(2009)
Regan, Fiona; Lawlor, Antoin; O'Flynn, Brendan; Torres, J; Martínez-Català, Rafael V.; Ó Mathúna, S. Cian; Wallace, John
Abstract:
Science Foundation Ireland (CSET - Centre for Science, Engineering and Technology 07/CE/I1147); Environmental Protection Agency (NDP); Marine Institute (NDP)
At a time when technological advances are providing new sensor capabilities, novel network capabilities, long-range communications technologies and data interpreting and delivery formats via the World Wide Web, we never before had such opportunities to sense and analyse the environment around us. However, the challenges exist. While measurement and detection of environmental pollutants can be successful under laboratory-controlled conditions, continuous in-situ monitoring remains one of the most challenging aspects of environmental sensing. This paper describes the development and test of a multi-sensor heterogeneous real-time water monitoring system. A multi-sensor system was deployed in the River Lee, County Cork, Ireland to monitor water quality parameters such as pH, temperature, conductivity, turbidity and dissolved ...
http://hdl.handle.net/10468/180
Marked
Mark
A double prodrug system for colon targeting of benzenesulfonamide COX-2 inhibitors
(2011)
KEOGH, BRIAN; WINDLE, HENRY; REILLY, MARY; GILMER, JOHN FRANCIS; KELLEHER, DERMOT P
A double prodrug system for colon targeting of benzenesulfonamide COX-2 inhibitors
(2011)
KEOGH, BRIAN; WINDLE, HENRY; REILLY, MARY; GILMER, JOHN FRANCIS; KELLEHER, DERMOT P
Abstract:
The design, synthesis and delivery potential of a new type of benzenesulfonamide cyclo-oxygenase-2 (COX-2) inhibitor prodrug is investigated using celecoxib. The approach involves a double prodrug that is activated first by azoreductases and then by cyclization triggering drug release. We studied the intramolecular aminolysis of the acylsulfonamide. The cyclization was surprisingly rapid at physiological pH and very fast at pH 5. The prodrug is activated specifically under conditions found in the colon but highly stable in the presence of human and rodent intestinal extracts. Finally, the prototype with celecoxib was transported much more slowly in the Caco-2 transepithelial model than the parent. The design therefore shows significant promise for the site specific delivery of benzenesulfonamide COX-2 inhibitors to the colon.
http://hdl.handle.net/2262/60695
Marked
Mark
A high-density ERP study reveals latency, amplitude, and topographical differences in multiple sclerosis patients versus controls.
(2010)
REILLY, RICHARD; KIISKI, HANNI
A high-density ERP study reveals latency, amplitude, and topographical differences in multiple sclerosis patients versus controls.
(2010)
REILLY, RICHARD; KIISKI, HANNI
Abstract:
Objective. To quantify latency, amplitude and topographical differences in event-related potential (ERP) components between multiple sclerosis (MS) patients and controls and to compare ERP findings with results from the paced auditory serial addition test (PASAT). Methods. Fifty-four subjects (17 relapsing remitting (RRMS) patients, 16 secondary progressive (SPMS) patients, and 21 controls) completed visual and auditory oddball tasks while data were recorded from 134 EEG channels. Latency and amplitude differences, calculated using composite mean amplitude measures, were tested using an ANOVA. Topographical differences were tested using statistical parametric mapping (SPM). Results. In the visual modality, P2, P3 amplitudes and N2 latency were significantly different across groups. In the auditory modality, P2, N2, and P3 latencies and N1 amplitude were significantly different across groups. There were no significant differences between RRMS and SPMS patients on any ERP component. T...
http://hdl.handle.net/2262/41102
Marked
Mark
A highly miniaturized wireless inertial sensor using a novel 3D flexible circuit
(2009)
Buckley, John; O'Flynn, Brendan; Barton, John; Ó Mathúna, S. Cian
A highly miniaturized wireless inertial sensor using a novel 3D flexible circuit
(2009)
Buckley, John; O'Flynn, Brendan; Barton, John; Ó Mathúna, S. Cian
Abstract:
Science Foundation Ireland (CSET - Centre for Science, Engineering and Technology); Enterprise Ireland (Proof-of-Concept project PC/2005/229)
Accepted Version
Purpose - The purpose of this paper is to develop a highly miniaturized wireless inertial sensor system based on a novel 3D packaging technique using a flexible printed circuit (FPC). The device is very suitable for wearable applications in which small size and lightweight are required such as body area network, medical, sports and entertainment applications.Design/methodology/approach - Modern wireless inertial measurement units are typically implemented on a rigid 2D printed circuit board (PCB). The design concept presented here is based around the use of a novel planar, six-faceted, crucifix or cross-shaped FPC instead of a rigid PCB. A number of specific functional blocks (such as microelectromechanical systems gyroscope and accelerometer sensors, microcontroller (MCU), radio transceiver, antenna, etc.) are first a...
http://hdl.handle.net/10468/156
Marked
Mark
A hybrid technique for face detection in color images
(2005)
Cooray, Saman H.; O'Connor, Noel E.
A hybrid technique for face detection in color images
(2005)
Cooray, Saman H.; O'Connor, Noel E.
Abstract:
In this paper, a hybrid technique for face detection in color images is presented. The proposed technique combines three analysis models, namely skin detection, automatic eye localization, and appearance-based face/nonface classification. Using a robust histogram-based skin detection model, skin-like pixels are first identified in the RGB color space. Based on this, face bounding-boxes are extracted from the image. On detecting a face bounding-box, approximate positions of the candidate mouth feature points are identified using the redness property of image pixels. A region-based eye localization step, based on the detected mouth feature points, is then applied to face bounding-boxes to locate possible eye feature points in the image. Based on the distance between the detected eye feature points, face/non-face classification is performed over a normalized search area using the Bayesian discriminating feature (BDF) analysis method. Some subjective evaluation results are presented on ...
http://doras.dcu.ie/235/
Marked
Mark
A method for source-microphone range estimation in reverberant environments, using an array of microphones of unknown relative position
(2006)
BOLAND, FRANCIS MORGAN
A method for source-microphone range estimation in reverberant environments, using an array of microphones of unknown relative position
(2006)
BOLAND, FRANCIS MORGAN
Abstract:
peer-reviewed
Estimating the range between an acoustic source and a microphone is a central problem in microphone-array processing. Although many approaches have been proposed in the literature, these tend to require knowledge of the relative microphone positions. We propose a range estimation method, for use in reverberant environments and where the relative positioning of the elements of a microphone-array is unknown. We demonstrate the effectiveness of this method under real, reverberant conditions.
http://hdl.handle.net/2262/19680
Marked
Mark
A method to predict residues conferring functional differences between related proteins: application to MAP kinase pathways
(2000)
O'NEILL, LUKE ANTHONY JOHN
A method to predict residues conferring functional differences between related proteins: application to MAP kinase pathways
(2000)
O'NEILL, LUKE ANTHONY JOHN
Abstract:
peer-reviewed
Physicochemical properties are potentially useful in predicting functional differences between aligned protein subfamilies. We present a method that considers physicochemical properties from ancestral sequences predicted to have given rise to the subfamilies of interest by gene duplication. Comparison between two map kinases subfamilies, p38 and ERK, revealed a region that had an excess of change in properties after gene duplication followed by conservation within the two subfamilies. This region corresponded to that experimentally defined as important for substrate and pathway specificity. The derived scores for the region of interest were found to differ significantly in their distribution compared to the rest of the protein when the Kolmogorov-Smirnov test was applied (p = 0.005). Thus, the incorporation of ancestral physicochemical properties is useful in predicting functional differences between protein subfamilies. In addition, the method was applied to the M...
http://hdl.handle.net/2262/33702
Marked
Mark
A node partitioning strategy for optimising the performance of XML queries
(2011)
Marks, Gerard
A node partitioning strategy for optimising the performance of XML queries
(2011)
Marks, Gerard
Abstract:
For ease of communication between heterogeneous systems, the eXtensible Markup Language (XML) has been widely adopted as a data storage format. However, XML query processing presents issues both in terms of query performance and updatability. Thus, many are choosing to shred XML data into relational databases in order to benet from its mature technology. The problem with this approach is that (often complex and time consuming) data transformation processes are required to transform XML data to relational tables and vice versa. Additionally, many of the benets of XML data can be lost during these processes. In this dissertation, we present a process that partitions nodes within an XML document into disjoint subsets. Briefly, as there are fewer partitions than there are nodes, a more efficient join operation can be performed between partitions, thus reducing the number of inefficient node comparisons. The number and size of partitions varies depending on the structure and layout in th...
http://doras.dcu.ie/16521/
Marked
Mark
A patient adapting heartbeat classifier using ECG morphology and heart-beat interval features
(2006)
REILLY, RICHARD
A patient adapting heartbeat classifier using ECG morphology and heart-beat interval features
(2006)
REILLY, RICHARD
Abstract:
peer-reviewed
An adaptive system for the automatic processing of the electrocardiogram (ECG) for the classification of heartbeats into one of the five beat classes recommended by ANSI/AAMI EC57:1998 standard is presented. The heartbeat classification system processes an incoming recording with a global-classifier to produce the first set of beat annotations. An expert then validates and if necessary corrects a fraction of the beats of the recording. The system then adapts by first training a local-classifier using the newly annotated beats and combines this with the global-classifier to produce an adapted classification system. The adapted system is then used to update beat annotations. The results of this study show that the performance of a patient adaptable classifier increases with the amount of training of the system on the local record. Crucially, the performance of the system can be significantly boosted with a small amount of adaptation even when all beats used for adapt...
http://hdl.handle.net/2262/17600
Marked
Mark
A pressure-based estimate of synthetic jet velocity
(2007)
PERSOONS, TIM; O'Donovan, T. S.
A pressure-based estimate of synthetic jet velocity
(2007)
PERSOONS, TIM; O'Donovan, T. S.
Abstract:
peer-reviewed
Synthetic jets are used for active flow control and enhanced heat transfer, and are typically generated by an orifice connected to a cavity with movable diaphragm actuator. Low-power operation is achieved by matching actuator and Helmholtz resonance frequencies. This brief communication presents an analytical model derived from simplified gas dynamics, for estimating the synthetic jet velocity and actuator deflection, based on a cavity pressure measurement. Model closure is provided by a damping force in the orifice, which agrees with established pressure loss correlations for steady flow through short ducts. The model is validated against experimental data obtained for an axisymmetric synthetic jet. The valid frequency range extends from zero, over the Helmholtz resonance frequency, up to a geometry-dependent limit frequency. This model presents a reference against which synthetic jet velocity can be calibrated
http://hdl.handle.net/2262/17179
Marked
Mark
A Privacy-enhanced Usage Control Model
(2010)
Slawomir, Grzonkowski
A Privacy-enhanced Usage Control Model
(2010)
Slawomir, Grzonkowski
Abstract:
Recently we have observed a growing demand for secure technologies for e-commerce that do not put customers at risk of identity theft. We have also experienced the advent of Web 2.0 which has led to new business models and which has changed the way users interact with the Web. This thesis proposes a set of strategies and enhancements towards providing improved security and privacy in such new settings. We introduce a novel concept: Fair Rights Management (FRM). It can be classified as a usage control solution. FRM enables a flexible way of managing digital content. There was a need to provide additional security extensions to keep such a flexible model applicable. Thus, in our approach we take advantage of trust obtained from social networks. This is also the reason why we created an efficient zero-knowledge proof protocol that is lightweight enough to be deployed within existing web-applications. The proposed protocol is also successfully integrated with Semantic Web architectu...
http://hdl.handle.net/10379/1849
Marked
Mark
A proactive approach to semantically oriented service discovery
(2006)
KEENEY, JOHN; LEWIS, DAVID; O'SULLIVAN, DECLAN
A proactive approach to semantically oriented service discovery
(2006)
KEENEY, JOHN; LEWIS, DAVID; O'SULLIVAN, DECLAN
Abstract:
peer-reviewed
This paper proposes a proactive approach to web service discovery which contrasts the passive approach exhibited by UDDI. The paper describes how a content based network implementation (Siena) has been extended to undertake matching based on ontological reasoning, resulting in a flexible knowledge-based delivery mechanism. In particular, it describes how this implementation has been used to support the proactive and potentially more efficient delivery of advertised web service profiles to users interested in services of those types.
http://hdl.handle.net/2262/30806
Marked
Mark
A Role for TLR4 in Clostridium difficile Infection and the Recognition of Surface Layer Proteins
(2011)
FALLON, PADRAIC GERARD; KELLEHER, DERMOT P; MORTON, CHARLES OLIVER; ROGERS, THOMAS RICH...
A Role for TLR4 in Clostridium difficile Infection and the Recognition of Surface Layer Proteins
(2011)
FALLON, PADRAIC GERARD; KELLEHER, DERMOT P; MORTON, CHARLES OLIVER; ROGERS, THOMAS RICHARD FRAZER; MC COY, CLAIRE; AMU, SYLVIE; O'NEILL, LUKE ANTHONY JOHN
Abstract:
Clostridium difficile is the etiological agent of antibiotic-associated diarrhoea (AAD) and pseudomembranous colitis in humans. The role of the surface layer proteins (SLPs) in this disease has not yet been fully explored. The aim of this study was to investigate a role for SLPs in the recognition of C. difficile and the subsequent activation of the immune system. Bone marrow derived dendritic cells (DCs) exposed to SLPs were assessed for production of inflammatory cytokines, expression of cell surface markers and their ability to generate T helper (Th) cell responses. DCs isolated from C3H/HeN and C3H/HeJ mice were used in order to examine whether SLPs are recognised by TLR4. The role of TLR4 in infection was examined in TLR4-deficient mice. SLPs induced maturation of DCs characterised by production of IL-12, TNFα and IL-10 and expression of MHC class II, CD40, CD80 and CD86. Furthermore, SLP-activated DCs generated Th cells producing IFNγ and IL-17. SLPs were unable to activate DC...
http://hdl.handle.net/2262/57429
Marked
Mark
A semi-systematic procedure for producing chaos from sinusoidal oscillators using diode-inductor and FET-capacitor composites
(2000)
Elwakil, Ahmed S.; Kennedy, Michael Peter
A semi-systematic procedure for producing chaos from sinusoidal oscillators using diode-inductor and FET-capacitor composites
(2000)
Elwakil, Ahmed S.; Kennedy, Michael Peter
Abstract:
Enterprise Ireland (Basic Research Programme under Grant SC/98/740)
Published Version
A design procedure for producing chaos is proposed. The procedure aims to transfer design issues of analog autonomous chaotic oscillators from the nonlinear domain back to the much simpler linear domain by intentionally modifying sinusoidal oscillator circuits in a semisystematic manner. Design rules that simplify this procedure are developed and then two composite devices, namely, a diode-inductor composite and a FET-capacitor composite are suggested for carrying out the modification procedure. Applications to the classical Wien-bridge oscillator are demonstrated. Experimental results, PSpice simulations, and numerical simulations of the derived models are included
http://hdl.handle.net/10468/174
Marked
Mark
A study of the RF characteristics for wireless sensor deployment in building environment
(2009)
Jafer, Essa; O'Flynn, Brendan; Ó Mathúna, S. Cian; Špinar, Rostislav
A study of the RF characteristics for wireless sensor deployment in building environment
(2009)
Jafer, Essa; O'Flynn, Brendan; Ó Mathúna, S. Cian; Špinar, Rostislav
Abstract:
Science Foundation Ireland (CSET - Centre for Science, Engineering and Technology); Science Foundation Ireland (National Access Programme); Enterprise Ireland
Published Version
In this paper, The radio Frequency (RF) Monitoring and Measurement of the Environmental Research Institute (ERI) located in Cork city will be monitored and analyzed in both the Zigbee (2.44 GHz) and the industrial, scientific and medical (ISM 433 MHz). The main objective of this survey is to confirm what the noise and interferences threat signals exist in these bands. It was agreed that the surveys would be carried out in 5 different rooms and areas that are candidates for the Wireless Sensors deployments. Based on the carried on study, A Zigbee standard Wireless Sensor Network (WSN) will be developed employing a number of motes for sensing number of signals like temperature, light and humidity beside the RSSI and battery voltage monitoring. Such system will be used later on to control and improve ind...
http://hdl.handle.net/10468/155
Marked
Mark
A system for event-based film browsing
(2006)
Lehane, Bart; O'Connor, Noel E.; Smeaton, Alan F.; Lee, Hyowon
A system for event-based film browsing
(2006)
Lehane, Bart; O'Connor, Noel E.; Smeaton, Alan F.; Lee, Hyowon
Abstract:
The recent past has seen a proliferation in the amount of digital video content being created and consumed. This is perhaps being driven by the increase in audiovisual quality, as well as the ease with which production, reproduction and consumption is now possible. The widespread use of digital video, as opposed its analogue counterpart, has opened up a plethora of previously impossible applications. This paper builds upon previous work that analysed digital video, namely movies, in order to facilitate presentation in an easily navigable manner. A film browsing interface, termed the MovieBrowser, is described, which allows users to easily locate specific portions of movies, as well as to obtain an understanding of the filming being perused. A number of experiments which assess the system’s performance are also presented.
http://doras.dcu.ie/268/
Marked
Mark
A virtual reality electrocardiography teaching tool
(2004)
O'SULLIVAN, CAROL ANN
A virtual reality electrocardiography teaching tool
(2004)
O'SULLIVAN, CAROL ANN
Abstract:
peer-reviewed
We present a novel approach to producing a tool for use in the teaching of electrocardiography. A volumetric model is attained by outputting slice information to image files, which are then used to texture polygons in the reconstruction of the volume. A time-stepping algorithm is used to synchronise the playback of the electrical depolarisation and repolarisation cycles of the heart on both the 3D cardiac model and 2D ECG graph. The tool is currently being integrated into undergraduate physiology modules.
http://hdl.handle.net/2262/18579
Marked
Mark
A Wind analysis of an evolved Giant. FUSE and HST/STIS observations of an eclipsing Symbiotic Binary
(2005)
ESPEY, BRIAN RUSSELL
A Wind analysis of an evolved Giant. FUSE and HST/STIS observations of an eclipsing Symbiotic Binary
(2005)
ESPEY, BRIAN RUSSELL
Abstract:
A major outstanding problem in stellar astrophysics lies in understanding the wind generation mechanism by which evolved giants lose mass. Phase-resolved observations of eclipsing symbiotic binary systems, containing a mass-losing giant and a hot white dwarf, are ideal for studying the wind generation mechanisms in evolved stars. For such systems we use the orbital motion of the dwarf through the giant’s wind to provide a pencil-beam view through the circumstellar gas. FUV observations can probe different layers of the wind in absorption, permitting the derivation of the velocity profile and providing valuable, spatially-resolved diagnostics of the cool wind. We present a series of FUSE and HST/STIS observations of two such systems and discuss our findings. The velocity profiles, and by implication, wind generation mechanisms for these giants are found to differ from those predicted by commonly used parametrisations. The phasing of our observations allow us to examine the density, t...
http://hdl.handle.net/2262/17440
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