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Displaying Results 226 - 250 of 2571 on page 10 of 103
Marked
Mark
An Estimation-based Automatic Vehicle Location System for Public Transport Vehicles
(2008)
MEIER, RENE
An Estimation-based Automatic Vehicle Location System for Public Transport Vehicles
(2008)
MEIER, RENE
Abstract:
Public transport vehicles often share a road network with other road users making their journeys susceptive to changing road conditions and especially to congestion. Travelers using such public transport increasingly depend on real-time information to plan their journeys. While such information can be provided by Automatic Vehicle Location (AVL) systems, AVLs depend heavily on large-scale deployment of designated sensory equipment, which may prevent their pervasive adoption. This paper presents a system for estimating vehicle location based on information generated by data sources typically integrated within existing ITS platforms. This enables location estimation for public transport vehicles without the need for deploying a designated sensor infrastructure in each vehicle, thereby reducing deployment and maintenance cost significantly. A prototypical vehicle location estimation system has been realized as part of and using data provided by the iTransIT ITS framework. Initial evalu...
http://hdl.handle.net/2262/36086
Marked
Mark
Testing the Reliability of an Authorship Identification Method
(2004)
VOGEL, CARL
Testing the Reliability of an Authorship Identification Method
(2004)
VOGEL, CARL
Abstract:
Forensic linguists try to #12;nd irregularities in language use, as irregularities provide 'signature' information that may withstand legal tests of certainty about, for example, authorship identi#12;cation. Irregularities inhere in all levels of language use, but here we focus on textual rather than spoken forms of language. Yet, this research #12;eld is still nascent and a lot of work needs to be done though existing methods give promising results. In this paper we will focus on an authorship identi#12;cation method from the literary (Chaski, 2000) implemented in a suite of computer programs developed by McCombe (2002) which was modi- #12;ed by Medori (2004). Validation tests of the method are reported here, using fabricated corpora as well as real texts. The results for the arti#12;cial and real text data will stress that further research is necessary. Besides the bad results, the program also gives very good results which, especially with regards to the poor results, a...
http://hdl.handle.net/2262/32286
Marked
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The computer sector in Irish manufacturing: past triumphs, present strains, future challenges
(2002)
Bradley, John
The computer sector in Irish manufacturing: past triumphs, present strains, future challenges
(2002)
Bradley, John
Abstract:
The health of the computer sector has come to symbolise the modernisation and rapid growth of the Irish economy during the 1990s. Any threats to its sustainability strike at the heart of broader economic and industrial strategy. After a brief statistical overview, this paper examines the wider strategic factors that facilitated the rise of the Irish computer ?agglomeration?. It describes how domestic policy evolved within a series of coherent frameworks that took account of the nature of the external environment (opportunities and threats) as well as realistic views of domestic capabilities (strengths and weaknesses). Within these frameworks, the decisions of individual policymakers shaped an industrial strategy that took decades to bear fruit and was a key contribution to bringing about convergence to EU standards of living. The paper also explores the likely future of the Irish computer sector, as it attempts to deal with an unfolding recession that started in the United States, t...
http://hdl.handle.net/2262/2621
Marked
Mark
Uniqueness Typing for Resource Management in Message-Passing Concurrency.
(2010)
HENNESSY, MATTHEW
Uniqueness Typing for Resource Management in Message-Passing Concurrency.
(2010)
HENNESSY, MATTHEW
Abstract:
We view channels as the main form of resources in a message-passing programming paradigm. These channels need to be carefully managed in settings where resources are scarce. To study this problem, we extend the pi-calculus with primitives for channel allocation and deallocation and allow channels to be reused to communicate values of different types. Inevitably, the added expressiveness increases the possibilities for runtime errors. We define a substructural type system which combines uniqueness typing and affine typing to reject these ill-behaved programs.
http://hdl.handle.net/2262/53125
Marked
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Process Behaviour: Formulae vs. Tests
(2010)
HENNESSY, MATTHEW
Process Behaviour: Formulae vs. Tests
(2010)
HENNESSY, MATTHEW
Abstract:
Process behaviour is often defined either in terms of the tests they satisfy, or in terms of the logical properties they enjoy. Here we compare these two approaches, using extensional testing in the style of DeNicola, Hennessy, and a recursive version of the property logic HML. We first characterise subsets of this property logic which can be captured by tests. Then we show that those subsets of the property logic capture precisely the power of tests.
http://hdl.handle.net/2262/53122
Marked
Mark
Hemodynamics for brain-computer interfaces: optical correlates of control signals
(2008)
Matthews, Fiachra; Pearlmutter, Barak A.; Ward, Tomas E.; Soraghan, Christopher; Markha...
Hemodynamics for brain-computer interfaces: optical correlates of control signals
(2008)
Matthews, Fiachra; Pearlmutter, Barak A.; Ward, Tomas E.; Soraghan, Christopher; Markham, Charles
Abstract:
This article brings together the various elements that constitute the signal processing challenges presented by a hemodynamics-driven functional near-infrared spectroscopy (fNIRS) based brain-computer interface (BCI). We discuss the use of optically derived measures of cortical hemodynamics as control signals for next generation BCIs. To this end we present a suitable introduction to the underlying measurement principle, we describe appropriate instrumentation and highlight how and where performance improvements can be made to current and future embodiments of such devices. Key design elements of a simple fNIRS-BCI system are highlighted while in the process identifying signal processing problems requiring improved solutions and suggesting methods by which this might be accomplished.
http://eprints.maynoothuniversity.ie/1360/
Marked
Mark
A Dual-Channel Optical Brain-Computer Interface In A Gaming Environment
(2006)
Soraghan, Christopher John; Matthews, Fiachra; Kelly, Dan; Markham, Charles; Pearlmutte...
A Dual-Channel Optical Brain-Computer Interface In A Gaming Environment
(2006)
Soraghan, Christopher John; Matthews, Fiachra; Kelly, Dan; Markham, Charles; Pearlmutter, Barak A.; O'Neill, Ray
Abstract:
This paper explores the viability of using a novel optical Brain-Computer Interface within a gaming environment. We describe a system that incorporates a 3D gaming engine and an optical BCI. This made it possible to classify activation in the motor cortex within a synchronous experimental paradigm. Detected activations were used to control the arm movement of a human model in the graphical engine.
http://eprints.maynoothuniversity.ie/1280/
Marked
Mark
3D object reconstruction using multiple views
(2011)
Kim, Donghoon
3D object reconstruction using multiple views
(2011)
Kim, Donghoon
Abstract:
THESIS 9687
3D object modelling from multiple view images has recently been of increasing interest in computer vision. Two techniques, Visual Hull and Photo Hull, have been extensively studied in the hope of developing 3D shape from multiple views. These early methods have the advantage that they do not require pre-processing procedures such as feature selection and matching, which fail when images are of low resolution. One drawback of these two methods is their discrete formulation, which is demanding of memory and limits the type of optimisation methods that can be used. This study proposes a continuous formulation in contrast to the discrete formulations typical of these earlier methods, and aims to robustly reconstruct the 3D shape and colour of an object seen in a multi-view system. The use of a continuous formulation based on kernel density estimates enables us to define a gradient ascent algorithm (e.g. a mean shift algorithm) to recover the 3D shape and colour. Moreover...
http://hdl.handle.net/2262/77628
Marked
Mark
Visual attention using 2D & 3D displays
(2015)
Zdziarski, Zbigniew
Visual attention using 2D & 3D displays
(2015)
Zdziarski, Zbigniew
Abstract:
In the past three decades, robotists and computer vision scientists, inspired by psychological and neurophysiological studies, have developed many computational models of attentions (CMAs) that mimic the behaviour of the human visual system in order to predict where humans will focus their attention. Most of CMA research has been focussing on the visual perception of images and videos displayed on 2D screens. There has recently, however, been a surge in devices that can display media in 3D and CMAs in this domain are becoming increasingly important. Research in this context is minimal, however. This thesis attempts to alleviate this problem. We explore the Graph-Based Visual Saliency algorithm [68] and extend it into 3D by developing a new depth incorporation method. We also propose a new online eye tracker calibration procedure that is more accurate and faster than standard processes and is also able to give confidence values associated with each eye position reading. Eye tracking ...
http://hdl.handle.net/2262/77674
Marked
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Developing a concept inventory for computer science 2
(2017)
HUGGARD, MERIEL
Developing a concept inventory for computer science 2
(2017)
HUGGARD, MERIEL
http://hdl.handle.net/2262/82664
Marked
Mark
Wearable Human Computer Interface for control within immersive VAMR gaming environments using data glove and hand gestures
(2018)
Wilk, Mariusz P.; Torres-Sanchez, Javier; Tedesco, Salvatore; O'Flynn, Brendan
Wearable Human Computer Interface for control within immersive VAMR gaming environments using data glove and hand gestures
(2018)
Wilk, Mariusz P.; Torres-Sanchez, Javier; Tedesco, Salvatore; O'Flynn, Brendan
Abstract:
The continuous advances in the state-of-the-art in the Virtual, Augmented, and Mixed Reality (V AMR) technology are important in many application spaces, including gaming, entertainment, and media technologies. V AMR is part of the broader Human-Computer Interface (HCI) area focused on providing an unprecedentedly immersive way of interacting with computers. These new ways of interacting with computers can leverage the emerging user input devices. In this paper, we present a demonstrator system that shows how our wearable Virtual Reality (VR) Glove can be used with an off-the-shelf head-mounted VR device, the RealWear HMT-1™. We show how the smart data capture glove can be used as an effective input device to the HMT-1™ to control various devices, such as virtual controls, simply using hand gesture recognition algorithms. We describe our fully functional proof-of-concept prototype, along with the complete system architecture and its ability to scale by incorporating other devices.
http://hdl.handle.net/10468/7184
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Dynamic environments can speed up evolution with genetic programming
(2012)
O'Neill, Michael; Nicolau, Miguel; Brabazon, Anthony
Dynamic environments can speed up evolution with genetic programming
(2012)
O'Neill, Michael; Nicolau, Miguel; Brabazon, Anthony
Abstract:
We present a study of dynamic environments with genetic programming to ascertain if a dynamic environment can speed up evolution when compared to an equivalent static environment. We present an analysis of the types of dynamic variation which can occur with a variable-length representation such as adopted in genetic programming identifying modular varying, structural varying and incremental varying goals. An empirical investigation comparing these three types of varying goals on dynamic symbolic regression benchmarks reveals an advantage for goals which vary in terms of increasing structural complexity. This provides evidence to support the added difficulty variable length representations incur due to their requirement to search structural and parametric space concurrently, and how directing search through varying structural goals with increasing complexity can speed up search with genetic programming.
Science Foundation Ireland
ti, ab - TS 28.03.12
http://hdl.handle.net/10197/3571
Marked
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Dynamic ant : introducing a new benchmark for genetic programming in dynamic environments
(2012)
Fagan, David; Nicolau, Miguel; Hemberg, Erik; O'Neill, Michael; Brabazon, Anthony
Dynamic ant : introducing a new benchmark for genetic programming in dynamic environments
(2012)
Fagan, David; Nicolau, Miguel; Hemberg, Erik; O'Neill, Michael; Brabazon, Anthony
Abstract:
In this paper we present a new variant of the ant problem in the dynamic problem domain. This approach presents a functional dynamism to the problem landscape, where by the behaviour of the ant is driven by its ability to explore the search space being constrained. This restriction is designed in such a way as to ensure that no generalised solution to the problem is possible, thus providing a functional change in behaviour.
Science Foundation Ireland
ti, ke, ab - TS 28.03.12 (Orna, later version presented at conference, see copyright field).
http://hdl.handle.net/10197/3570
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On the role of ontological semantics in routing contextual knowledge in highly distributed autonomic systems
(2006)
KEENEY, JOHN; LEWIS, DAVID; O'SULLIVAN, DECLAN
On the role of ontological semantics in routing contextual knowledge in highly distributed autonomic systems
(2006)
KEENEY, JOHN; LEWIS, DAVID; O'SULLIVAN, DECLAN
Abstract:
Much recent research has focused on applying Autonomic Computing principles to achieve constrained self-management in adaptive systems, through self-monitoring and analysis, strategy planning, and self adjustment. However, in a highly distributed system, just monitoring current operation and context is a complex and largely unsolved problem domain. This difficulty is particularly evident in the areas of network management, pervasive computing, and autonomic communications. This paper presents a model for the filtered dissemination of semantically enriched knowledge over a loosely coupled network of distributed heterogeneous autonomic agents. It also presents an implementation of such a Knowledge Delivery Network, which enables the efficient routing of distributed heterogeneous knowledge to, and only to, nodes that have expressed an interest in that knowledge for use as the operational or context information monitored in order to analyse to the system?s behaviour as part of an autono...
http://hdl.handle.net/2262/30969
Marked
Mark
Diversity in Ensemble Feature Selection
(2003)
Tsymbal, Alexey; Cunningham, Padraig
Diversity in Ensemble Feature Selection
(2003)
Tsymbal, Alexey; Cunningham, Padraig
Abstract:
TCD-CS-2003-44
Ensembles of learnt models constitute one of the main current directions in machine learning and data mining. Ensembles allow us to achieve higher accuracy, which is often not achievable with single models. It was shown theoretically and experimentally that in order for an ensemble to be effective, it should consist of high-accuracy base classifiers that should have high diversity in their predictions. One technique, which proved to be effective for constructing an ensemble of accurate and diverse base classifiers, is to use different feature subsets, or so-called ensemble feature selection. Many ensemble feature selection strategies incorporate diversity as a component of the fitness function in the search for the best collection of feature subsets. There are known a number of ways to quantify diversity in ensembles of classifiers, and little research has been done about their appropriateness to ensemble feature selection. In this paper, we compare seven measures...
http://hdl.handle.net/2262/12600
Marked
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FacetS: First Class Entities for an Open Dynamic AOP Language
(2006)
Bergel, Alexandre
FacetS: First Class Entities for an Open Dynamic AOP Language
(2006)
Bergel, Alexandre
Abstract:
TCD-CS-2006-31
This paper describes a new aspect language construct for Squeak, named FACETS. Aspects are completely integrated within the Squeak programming language and its environment. The innovations of FACETS are: (i) traits can be part of the pointcut definition, (ii) two scoping policies are available to share state among aspects and (iii) aspects are prototype-based.
http://hdl.handle.net/2262/13478
Marked
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Blame-Based Noise Reduction: An Alternative Perspective on Noise Reduction for Lazy Learning
(2005)
Pasquier, Francois-Xavier; Delany, Sarah Jane; Cunningham, Padraig
Blame-Based Noise Reduction: An Alternative Perspective on Noise Reduction for Lazy Learning
(2005)
Pasquier, Francois-Xavier; Delany, Sarah Jane; Cunningham, Padraig
Abstract:
TCD-CS-2005-29
In this paper we present a new perspective on noise reduction for nearest-neighbour classifiers. Classic noise reduction algorithms such as Repeated Edited Nearest Neighbour remove cases from the training set if they are misclassified by their nearest neighbours in a leave-one-out cross validation. In the approach presented here, cases are identified for deletion based on their propensity to cause misclassifications. This approach was originally identified in a case-based spam filtering application where it became clear that certain training examples were damaging to the accuracy of the system. In this paper we evaluate the general applicability of the approach on a large variety of datasets and show that it generally beats the classic approach. We also compare the two techniques on artificial noise and show that both are far from perfect at removing noise and that there remains scope for further research in this area.
http://hdl.handle.net/2262/13378
Marked
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Authoring and Delivering Personalised Simulations an Innovative Approach to Adaptive eLearning for Soft Skills
(2010)
GAFFNEY, CONOR; WADE, VINCENT PATRICK; DAGGER, DECLAN
Authoring and Delivering Personalised Simulations an Innovative Approach to Adaptive eLearning for Soft Skills
(2010)
GAFFNEY, CONOR; WADE, VINCENT PATRICK; DAGGER, DECLAN
http://hdl.handle.net/2262/67212
Marked
Mark
Texture based classification of topographic objects
(2004)
Corcoran, Padraig; Winstanley, Adam C.
Texture based classification of topographic objects
(2004)
Corcoran, Padraig; Winstanley, Adam C.
Abstract:
Geographical data is being generated at an ever-increasing rate by organisations involved with remote sensing, surveying and mapping. To capture semantic content of this data manually is expensive and so to address this issue, research carried out by our group, the Intelligent and Graphical Systems group of the Department of Computer Science, involves the capture and automatic structuring of data for various kinds of graphical information system. If this task can be automated, it will increase the availability of data and decrease its cost. The goal of the systems currently in place is the recognition and classification of geographical features solely from vector data sets that have been captured through manual digitisation. Modifying the existing classification systems to deal with raster image data (such as remotely sensed images) is desirable for two reasons: Most captured data is initially in a raster data format and must be converted to vector formats. The raster data can c...
http://eprints.maynoothuniversity.ie/4911/
Marked
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nExaminer: A Semi-automated Computer Programming Assignment Assessment Framework for Moodle
(2011)
Cheng, Zheng; Monahan, Rosemary; Mooney, Aidan
nExaminer: A Semi-automated Computer Programming Assignment Assessment Framework for Moodle
(2011)
Cheng, Zheng; Monahan, Rosemary; Mooney, Aidan
Abstract:
In this paper, we present the nExaminer framework, a learning support tool for the Virtual Learning Environment, called Moodle. nExaminer is a framework for the semi-automated assessment of computer programming assignments. The motivation for developing the framework is based on the observation of a major problem associated with traditional assignment assessment in Moodle - managing an effective relationship between the instructor and the students is difficult. Providing a tool that will support both the student (through feedback on progress) and the instructor (through support the correction of assignments) will help to reduce this problem. The design and implementation of our proposed solution, the nExaminer framework, is discussed in this paper. The benefits that our framework provides to both students and instructors are also presented. Experimental results with the nExaminer framework have been encouraging. These show that the framework provides instructors with the ability to ...
http://eprints.maynoothuniversity.ie/3933/
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Integrated Real-Time Control And Processing Systems For Multi-Channel Near-Infrared Spectroscopy Based Brain Computer Interfaces
(2010)
Matthews, Fiachra
Integrated Real-Time Control And Processing Systems For Multi-Channel Near-Infrared Spectroscopy Based Brain Computer Interfaces
(2010)
Matthews, Fiachra
Abstract:
This thesis outlines approaches to improve the signal processing and anal- ysis of Near-infrared spectroscopy (NIRS) based brain-computer interfaces (BCI). These approaches were developed in conjunction with the implemen- tation of a new customized exible multi-channel NIRS based BCI hardware system (Soraghan, 2010). Using a comparable functional imaging modality the assumptions on which NIRS-BCI have been reassessed, with regard to cognitive task selection, active area locations and lateralized motor cortex activation separability. This dissertation will also present methods that have been implemented to allow reduced hardware requirements in future NIRS-BCI development. We will also examine the sources of homeostatic physiological interference and present new approaches for analysis and at- tenuation within a real-time NIRS-BCI paradigm.
http://eprints.maynoothuniversity.ie/2777/
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Lightweight signal processing algorithms for human activity monitoring using dual PIR-sensor nodes
(2009)
Tahir, Muhammad; Hung, Peter; Farrell, Ronan; McLoone, Sean F.; McCarthy, Tim
Lightweight signal processing algorithms for human activity monitoring using dual PIR-sensor nodes
(2009)
Tahir, Muhammad; Hung, Peter; Farrell, Ronan; McLoone, Sean F.; McCarthy, Tim
Abstract:
A dual Pyroelectric InfraRed (PIR) sensor node is used for human activity monitoring by using simple data processing techniques. We first point out the limitations of existing approaches, employing PIR sensors, for activity monitoring. We study the spectral characteristics of the sensor data for the cases of varying distance between the sensor and moving object as well as the speed of the object under observation. The sampled data from two PIR sensors, is first processed individually to determine the activity window size, which is then fed to a simple algorithm to determine direction of motion.We also claim that human count can be obtained for special scenarios. Preliminary results of our experimentation show the effectiveness of the simple algorithm proposed and give us an avenue for estimating more involved parameters used for speed and localization.
http://eprints.maynoothuniversity.ie/2593/
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Demonstrator Platform for Antenna Array Calibration
(2009)
Corley, Gerry; McCormack, Justine; Farrell, Ronan
Demonstrator Platform for Antenna Array Calibration
(2009)
Corley, Gerry; McCormack, Justine; Farrell, Ronan
Abstract:
This paper presents a hardware platform for antenna array calibration research in tower top electronics. The platform has eight phase and amplitude controlled transmit channels and a novel antenna coupler array structure which provides nonradiative calibration capability. The phase and amplitude of each channel can be varied between 0 and 360° and over 25dB respectively under full software control. The platform has been used to test and develop array calibration routines which achieve amplitude variances of less than 1dB and phase variances of less than 5° measured between eight channels at the antenna connections.
http://eprints.maynoothuniversity.ie/2556/
Marked
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Extracting Localised Mobile Activity Patterns from Cumulative Mobile Spectrum RSSI
(2009)
Doyle, John; Farrell, Ronan; McLoone, Sean F.; McCarthy, Tim; Hung, Peter
Extracting Localised Mobile Activity Patterns from Cumulative Mobile Spectrum RSSI
(2009)
Doyle, John; Farrell, Ronan; McLoone, Sean F.; McCarthy, Tim; Hung, Peter
Abstract:
Techniques for observing the flow of people are creating new means for observing the dynamics between people and the environments they pass through. This ubiquitous connectivity can be observed and interpreted in real-time, through mobile device activity patterns. Recent research into urban analysis through the use of mobile device usage statistics has presented a need for the collection of this data independently from mobile network operators. In this paper we demonstrate that by extracting cumulative received signal strength indication (RSSI) for overall mobile device transmissions, such information can be obtained independently from network operators. We present preliminary results and suggest future applications for which this collection method may be used.
http://eprints.maynoothuniversity.ie/2536/
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A characterisation of NL using membrane systems without charges and dissolution
(2008)
Murphy, Niall; Woods, Damien
A characterisation of NL using membrane systems without charges and dissolution
(2008)
Murphy, Niall; Woods, Damien
Abstract:
We apply techniques from complexity theory to a model of biological cellular membranes known as membrane systems or P-systems. Like circuits, membrane systems are dened as uniform families. To date, polynomial time uniformity was the accepted uniformity notion for membrane systems. Here, we introduce the idea of using AC0 and L uniformities and investigate the computational power of membrane systems under these tighter conditions. It turns out that the computational power of some systems is lowered from P to NL, so it seems that our tighter uniformities are more reasonable for these systems. Interestingly, other systems that are known to be lower bounded by P are shown to retain their computational power under the new uniformity conditions. Similarly, a number of membrane systems that are lower bounded by PSPACE retain their power under the new uniformity conditions.
http://eprints.maynoothuniversity.ie/2366/
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