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Displaying Results 26 - 50 of 4955 on page 2 of 199
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2-D numerical-analysis of metallic band-gap crystal waveguide in THz
(2009)
Degirmenci, Elif; Surre, Frederic; Landais, Pascal
2-D numerical-analysis of metallic band-gap crystal waveguide in THz
(2009)
Degirmenci, Elif; Surre, Frederic; Landais, Pascal
Abstract:
The Finite Element Method (FEM) is used to design a metallic band-gap crystal waveguide operating at THz frequencies. Transmission characteristics have been obtained for two types of patterns, square and triangular arrays.
http://doras.dcu.ie/15449/
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Testing Finitary Probabilistic Processes
(2009)
HENNESSY, MATTHEW
Testing Finitary Probabilistic Processes
(2009)
HENNESSY, MATTHEW
Abstract:
This paper provides modal- and relational characterisations of may- and must-testing preorders for recursive CSP processes with divergence, featuring probabilistic as well as nondeterministic choice. May testing is characterised in terms of simulation, and must testing in terms of failure simulation. To this end we develop weak transitions between probabilistic processes, elaborate their topological properties, and capture divergence in terms of partial distributions.
http://hdl.handle.net/2262/53124
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Code generation for hardware accelerated AES
(2010)
GREGG, DAVID
Code generation for hardware accelerated AES
(2010)
GREGG, DAVID
Abstract:
Data must be encrypted if it is to remain confidential when sent over computer networks. Encryption solves many problems involving invasion of privacy, identity theft, fraud, and data theft. However for encryption to be widely used, it must be fast. The problem is so important that new Intel processors provide hardware support for encryption. These instructions implement key stages of the Advanced Encryption Standard (AES), allowing encryption to be completed more quickly and using less power. The AES algorithm consists of several 'rounds' of encryption, each of which involves a relatively complicated computation. This new hardware support allows an entire round to be implemented with just a single instruction. An implementation of the AES algorithm using these instructions contains several code sections that can be fine tuned for optimal performance. However, these optimizations are usually done by hand, which can be a lengthy, labour intensive process. We present a syste...
http://hdl.handle.net/2262/56820
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24-Hour Electrical Load Data - A Time Series or a Set of Independent Points?
(2001)
Fay, Damien; Ringwood, John V.; Condon, Marissa; Kelly, Michael
24-Hour Electrical Load Data - A Time Series or a Set of Independent Points?
(2001)
Fay, Damien; Ringwood, John V.; Condon, Marissa; Kelly, Michael
Abstract:
The paper investigates whether a time series or a set of independent points is a more appropriate description of 24-hour Irish electrical load data. A set of independent points means that the load at each hour of the day is independent from the load at any other hour. The data is first split into 24 series, one for each hour of the day i.e. a 1am 2am 3am series etc. These are called parallel series. The linear cross-correlation's of the parallel series are used to indicate independence. While the loads at 9am and 6pm to 8pm appear independent the remaining loads are highly inter-correlated. This suggests that 24-hour electrical load data has a dual nature. Two techniques are used to test this hypothesis. The first technique models each parallel series using neural networks. This technique is found to be computationally expensive. The second technique uses a hybrid technique called the Multi Time Scale (MTS) technique. This models 24-hour electrical load data as a time series th...
http://eprints.nuim.ie/1967/
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Open Design and the Reprap Project
(2010)
BENNETT, GARETH; O'DONNELL, GARRET EDWARD
Open Design and the Reprap Project
(2010)
BENNETT, GARETH; O'DONNELL, GARRET EDWARD
Abstract:
This paper details the investigation of an emerging trend within technology development: ‘open design’. Improvements in communications and computing technology have made collaboration over geographically vast distances possible. This technology has already had a major impact on the field of engineering, from the development of CAD/CAE/CAM practices to the emergence of concurrent engineering. Taking the lead from open source software, open design is an approach to technology development in which technical design information is licensed in such a manner that it can be accessed, utilised, modified and redistributed by anyone. The potential implications of this concept can be inferred from the impact of open source software. A review of the existing literature on the subject was conducted. A practical demonstration of the process was undertaken, via an attempt to contribute to an existing open design technology: the RepRap. This is a low cost rapid prototyper capable of manufacturing th...
http://hdl.handle.net/2262/41053
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Eliciting audio evoked potentials using continuous stimuli
(2007)
LALOR, EDMUND; REILLY, RICHARD
Eliciting audio evoked potentials using continuous stimuli
(2007)
LALOR, EDMUND; REILLY, RICHARD
Abstract:
peer-reviewed
Noise input signals are commonly used in both linear and non-linear system identification of physiological systems. This method can be applied to electrophysiological analysis of the human auditory system by controlling the modulation of the amplitude of a sound stimulus using a pre- computed noise signal. In this study we describe how one can obtain an estimate of the linear response of the auditory system using noise signals and we compare it to a standard auditory evoked potential (AEP). Two different noise modulated sounds are tested, broadband noise (BBN) and a 2kHz tone. Results show that the BBN is better at eliciting notable responses. Results also show that although the SNR of the proposed response to the modulated BBN is generally lower than the standard AEP the two responses do correlate well suggesting that the spread spectrum stimulus is a valid method for elicitation of an AEP.
http://hdl.handle.net/2262/17641
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2LIP: Filling the Gap between the Current and the Three-Dimensional Web
(2009)
Jankowski, Jacek; Decker, Stefan
2LIP: Filling the Gap between the Current and the Three-Dimensional Web
(2009)
Jankowski, Jacek; Decker, Stefan
Abstract:
In this article we present a novel approach, the 2-Layer Interface Paradigm (2LIP), for designing simple yet interactive 3D web applications, an attempt to marry advantages of 3D experience with the advantages of the narrative structure of hypertext. The hyper-text information, together with graphics, and multimedia, is presented semi-transparently on the foreground layer. It overlays the 3D representation of the information displayed in the background f the interface. Hyperlinks are used for navigation in the 3D scenes(in both layers).We introduce a reference implementation of 2LIP: Copernicus - The Virtual 3D Encyclopedia, which can become a model for building 3D Wikipedia. Based on the evaluation of Copernicus we show that designing web interfaces according to 2LIP provides users with a better experience during browsing the Web, has a positive effect on the visual and associative memory, improves spatial cognition of presented information, and increases overall user's satisf...
http://hdl.handle.net/10379/1090
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Enabling dynamic spectrum access using SS-MC-CDMA
(2007)
DOYLE, LINDA; NOLAN, KEITH EDWARD; SARATH, DEEPAK; SUTTON, PAUL DAVID
Enabling dynamic spectrum access using SS-MC-CDMA
(2007)
DOYLE, LINDA; NOLAN, KEITH EDWARD; SARATH, DEEPAK; SUTTON, PAUL DAVID
Abstract:
peer-reviewed
The demand for frequency spectrum and diversity of wireless devices accessing this spectrum depends upon the time of day, the characteristics of a frequency band, and the geographical location of the observer/wireless device. This paper highlights the value of employing a novel dynamic spectrum access technology using a highly reconfigurable spectrum access scheme with excellent frequency diversity properties. We name this robust scheme selective subcarrier multi-carrier code division multiple access (SS-MC-CDMA). This paper contains three main contributions. Firstly, the reconfigurability options in a physical layer (PHY) using MC-CDMA and the flexibility in system design of a cognitive radio are presented. Secondly, an application of the novel SS-MC-CDMA system in a dynamic spectrum access (DSA) scenario is developed in order to indicate the value and potential of this system. Finally, based on this scenario, we present some initial key results from both simulati...
http://hdl.handle.net/2262/29823
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300 years of copyright: have we gone full circle? On the use of technology to address limitations in distributing public performance broadcast royalties.
(2009)
Healy, Ron; Timoney, Joseph
300 years of copyright: have we gone full circle? On the use of technology to address limitations in distributing public performance broadcast royalties.
(2009)
Healy, Ron; Timoney, Joseph
Abstract:
This paper briefly examines the concept and rationale of Copyright at the time of its inception and considers whether current legislation and, more distinctly, the administration of some of the rights specified by Copyright legislation has created a situation whereby authors of works in the music industry are being adversely affected and even exploited by such schemes thereby completing the circle by returning many authors to the point which made Copyright legislation necessary. This paper also outlines the design and implementation of a completely automatic, open and transparent blind-detection digital audio watermarking system that will enable automatic monitoring and reporting of public performance of both digital and analogue radio and television transmissions using modern computer technology in order to generate accurate royalty distributions to ‘authors’ in order to administer their rights more equitably.
http://eprints.nuim.ie/1636/
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380 MHz Low-Power Sharp-Rejection Active-RC LPF for IEEE 802.15.4a UWB WPAN
(2009)
Tuan-Phan, Anh; Farrell, Ronan ; Gug-Lee, Sang; Lee, Jeongseon
380 MHz Low-Power Sharp-Rejection Active-RC LPF for IEEE 802.15.4a UWB WPAN
(2009)
Tuan-Phan, Anh; Farrell, Ronan ; Gug-Lee, Sang; Lee, Jeongseon
Abstract:
This paper describes a wide-band sharp-rejection active-RC low pass filter (LPF) for pulse-based UWB IEEE 802.15.4a WPA, applications. Sharp rejection is attributed to the combination of different AC characteristic of three biquads in series. A simple operational amplifier (Op-amp) is adopted to ensure high frequency performance for the designed filter. The LPF is designed in 0.13μm TSMC CMOS process. The cutoff frequency is 380MHz with about 50% of the tuning range from 300-500MHz. The rejection is 40 dB at 600 MHz. The passband ripple is less than 1.5dB and the filter consumes 4.6mA from 1.2V supply. Core chip size is 580 x 700μm2.
http://eprints.nuim.ie/1458/
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3D estimation and visualization of motion in a multicamera network for sports
(2011)
Kelly, Philip; O'Connor, Noel E.
3D estimation and visualization of motion in a multicamera network for sports
(2011)
Kelly, Philip; O'Connor, Noel E.
Abstract:
In this work, we develop image processing and computer vision techniques for visually tracking a tennis ball, in 3D, on a court instrumented with multiple low cost IP cameras. The technique first extracts 2D ball track data from each camera view, using object tracking methods. Next, an automatic feature- based video synchronization method is applied. This technique uses both the extracted 2D ball information from two or more camera views, plus camera calibration information. Then, in order to find 3D trajectory, the temporal 3D locations of the ball is estimated using triangulation of correspondent 2D locations obtained from automatically synchronized videos. Furthermore, we also incorporate a physics-based trajectory model into the system to improve the continuity of the tracked 3D ball during times when no two cameras have overlapping views of the ball location. The resultant 3D ball tracks are then visualized in a virtual 3D graphical environment. Finally, we quantify the accurac...
http://doras.dcu.ie/16575/
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3D image analysis for pedestrian detection
(2006)
Kelly, Philip; Cooke, Eddie; O'Connor, Noel E.; Smeaton, Alan F.
3D image analysis for pedestrian detection
(2006)
Kelly, Philip; Cooke, Eddie; O'Connor, Noel E.; Smeaton, Alan F.
Abstract:
A method for solving the dense disparity stereo correspondence problem is presented in this paper. This technique is designed specifically for pedestrian detection type applications. A new Ground Control Points (GCPs) scheme is introduced, using groundplane homography information to determine regions in which good GCPs are likely to occur. The method also introduces a dynamic disparity limit constraint to further improve GCP selection and dense disparity generation. The technique is applied to a real world pedestrian detection scenario with a background modeling system based on disparity and edges.
http://doras.dcu.ie/381/
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3DWiki: The 3D Wiki Engine
(2009)
Cobos, Yolanda; McDaniel, Bill; Decker, Stefan
3DWiki: The 3D Wiki Engine
(2009)
Cobos, Yolanda; McDaniel, Bill; Decker, Stefan
Abstract:
We demonstrate one of the potential paths of the evolution of wiki engines towards Web 3.0. We introduce 3dWiki - the 3D wiki engine, which was built according to 2-Layer Interface Paradigm (2LIP). It was developed for use by Copernicus, our vision of a 3D encyclopedia. In the demonstration: We give an overview of 2-Layer Interface Paradigm, an attempt to marry advantages of 3D experience with the advantages of narrative structure of hypertext. We describe step by step how to create an article for Copernicus: from creating models for the 3D background, through authoring the content, creating the c-links, to publishing the result in our encyclopedia. We show how to use a physics engine in our wiki.
http://hdl.handle.net/10379/622
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Supporting Learner Model Exchange in Educational Web Systems
(2011)
WADE, VINCENT PATRICK; WALSH, EDMOND
Supporting Learner Model Exchange in Educational Web Systems
(2011)
WADE, VINCENT PATRICK; WALSH, EDMOND
Abstract:
The heterogeneity of learner models in structure, syntax and semantics makes sharing them a significant challenge for existing educational web systems. Creating mappings between the different types of learner models is one technique that is used when attempting to overcome these issues. This paper presents an overview of research currently being conducted in the area of learner model exchange and defines a categorization, derived from existing educational web systems, of the different mapping types that are required for learner model mapping. Following this, a framework is presented that supports the creation and validation of these different mapping types and the exchange of learner information between multiple heterogeneous educational web systems.
http://hdl.handle.net/2262/56862
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80 Gb/s optimised pulse source using a gain-switched laser diode in conjunction with a nonlinearly chirped grating
(2005)
Clarke, Aisling M.; Rensing, Marc; Anandarajah, Prince M.; Barry, Liam P.; Harvey, John...
80 Gb/s optimised pulse source using a gain-switched laser diode in conjunction with a nonlinearly chirped grating
(2005)
Clarke, Aisling M.; Rensing, Marc; Anandarajah, Prince M.; Barry, Liam P.; Harvey, John D.; Edvell, G.
Abstract:
The authors demonstrate the generation of transforms limited short optical pulses, which display excellent spectral and temporal qualities by employing a novel technology, based on an externally injected gain-switched laser in conjunction with a non-linearly chirped grating. Using this technique, 3.5 ps optical pulses, exhibiting a time bandwidth product of 0.45, are generated, which are suitable for use in high-speed 80 Gb/s OTDM communications systems.
http://doras.dcu.ie/2325/
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Using Pseudo Feedback to Improve Cross-Lingual Ontology Mapping
(2011)
O'SULLIVAN, DECLAN; BRENNAN, ROB; FU, BO
Using Pseudo Feedback to Improve Cross-Lingual Ontology Mapping
(2011)
O'SULLIVAN, DECLAN; BRENNAN, ROB; FU, BO
Abstract:
Translation techniques are often employed by cross-lingual ontology mapping (CLOM) approaches to turn a cross-lingual mapping problem into a monolingual mapping problem which can then be solved by state of the art monolingual ontology matching tools. However in the process of doing so, noisy translations can compromise the quality of the matches generated by the subsequent monolingual matching techniques. In this paper, a novel approach to improve the quality of cross-lingual ontology mapping is presented and evaluated. The proposed approach adopts the pseudo feedback technique that is similar to the well understood relevance feedback mechanism used in the field of information retrieval. It is shown through the evaluation that pseudo feedback can improve the matching quality in a CLOM scenario.
http://hdl.handle.net/2262/58997
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A 12-Channel, real-time near-infrared spectroscopy instrument for brain-computer interface applications
(2008)
Soraghan , C.; Matthews, F.; Markham, C.; Pearlmutter, B. A.; O'Neill, R.; Ward, T.E.
A 12-Channel, real-time near-infrared spectroscopy instrument for brain-computer interface applications
(2008)
Soraghan , C.; Matthews, F.; Markham, C.; Pearlmutter, B. 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.nuim.ie/1441/
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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 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
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A benchmark comparison between reconfigurable, intelligent and autonomous wireless inertial measurement and photonic technologies in rehabilitation
(2011)
Walsh, Michael; Tyndyk, Magdalena; Barton, John; O'Flynn, Brendan; Ó Mathúna, S. Cian
A benchmark comparison between reconfigurable, intelligent and autonomous wireless inertial measurement and photonic technologies in rehabilitation
(2011)
Walsh, Michael; Tyndyk, Magdalena; Barton, John; O'Flynn, Brendan; Ó Mathúna, S. Cian
Abstract:
Accepted Version
Science Foundation Ireland (CSET - Centre for Science, Engineering and Technology, Grant No. 07/CE/11147)
Advanced sensory systems address a number of major obstacles towards the provision for cost effective and proactive rehabilitation. Many of these systems employ technologies such as high-speed video or motion capture to generate quantitative measurements. However these solutions are accompanied by some major limitations including extensive set-up and calibration, restriction to indoor use, high cost and time consuming data analysis. Additionally many do not quantify improvement in a rigorous manner for example gait analysis for 5 minutes as opposed to 24 hour ambulatory monitoring. This work addresses these limitations using low cost, wearable wireless inertial measurement as a mobile and minimal infrastructure alternative. In cooperation with healthcare professionals the goal is to design and implement a reconfigurable and intelligent movement capture s...
http://hdl.handle.net/10468/390
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Mark
A Brief Introduction to Speech Synthesis and Voice Modification
(2007)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel
A Brief Introduction to Speech Synthesis and Voice Modification
(2007)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel
Abstract:
<p>For both engineers and linguists, the computer synthesis of natural speech is an objective that would provide many useful applications to human-computer interaction, including the realm of electro-acoustic music. The purpose of this paper is to introduce the area of speech synthesis by providing an overview of the three main methods of computer speech synthesis; namely concatenative, articulatory and formant syntheses. Some aspects of the current state of the technology are illuminated and the final section will explain the author’s motivation and current research approach to the field of voice modification.</p>
http://arrow.dit.ie/argcon/56
Marked
Mark
A Built-In-Test Circuit for Functional Verification & PVT Variations Monitoring of CMOS RF Circuits
(2006)
Zhang, Guoyan; Sánchez Mora, Magdalena; Farrell, Ronan
A Built-In-Test Circuit for Functional Verification & PVT Variations Monitoring of CMOS RF Circuits
(2006)
Zhang, Guoyan; Sánchez Mora, Magdalena; Farrell, Ronan
Abstract:
Built-In-Test (BIT) for Radio Frequency (RF) integrated circuits can reduce the testing cost, especially with the increase of integration level and operating frequency. A fully integrated CMOS BIT detection circuit is presented in this work. This BIT detection circuit is rectifier-based and low threshold voltage diode-connected MOS transistor with substrate positively-biased is used to improve the detecting sensitivity. As an example, a 2.4GHz LNA is used, the high frequency small signal gain is extracted and the gain fluctuation due to Process, supply Voltage and Temperature (PVT) variations is also investigated. The simulation results show that this BIT detection circuit can realize on-chip functional verification of RF circuits and also monitor the influence of PVT variations on the performance of the circuit without affecting the high frequency performance of the measured RF circuits.
http://eprints.nuim.ie/603/
Marked
Mark
A Case for the use of Application Generators in the Creation of Software for the Hotel Industry
(1992)
O'Connor, Peter; McDonnell, Ciaran
A Case for the use of Application Generators in the Creation of Software for the Hotel Industry
(1992)
O'Connor, Peter; McDonnell, Ciaran
Abstract:
<p>The article makes the case for the use of Program Generators in producing software for the Hotel and Catering Industry</p>
http://arrow.dit.ie/dmccon/10
Marked
Mark
A case of productive entanglement? Researching a post compulsory learning network.
(2007)
Kamp, Annelies
A case of productive entanglement? Researching a post compulsory learning network.
(2007)
Kamp, Annelies
Abstract:
In this paper I aim to achieve two outcomes. The first is to open up thinking around how, in a context where governments are increasingly exploring and drawing on notions of fluid networks, joined-up government, interagency collaboration and so on, we can develop forms of policy sociology that can capture the complex 'what happened' of policy outcomes. Secondly, I want to briefly share the findings of my own case study research into one such government-instituted network in Victoria, Australia.
http://doras.dcu.ie/16249/
Displaying Results 26 - 50 of 4955 on page 2 of 199
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