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Articles 7471 - 7500 of 9182
Full-Text Articles in Entire DC Network
An Experimental Investigation Of Parallel Multimedia Streams Over Ieee 802.11e Wlan Networks Using Txop, Nicola Cranley, Tanmoy Debnath, Mark Davis
An Experimental Investigation Of Parallel Multimedia Streams Over Ieee 802.11e Wlan Networks Using Txop, Nicola Cranley, Tanmoy Debnath, Mark Davis
Conference papers
In this paper we perform an experimental investigation of the IEEE 802.11 TXOP facility to enhance the transmission of parallel multimedia streaming sessions through efficient bandwidth reservation and explicitly consider both the audio and video streams. The delay constraints associated with the audio and video streams that comprise a multimedia session pose the greatest challenge since real-time multimedia is particularly sensitive to delay as the packets require a strict bounded end-to-end delay. We show how the TXOPlimit parameter can be efficiently dimensioned to reduce the tranmission delay for the video frames. Due to tis frame-based nature, video applications are considered …
Effect Of Snr Of Input Signal On The Accuracy Of A Ratiometric Wavelength Measurement System, Ginu Rajan, Qian Wang, Gerald Farrell, Yuliya Semenova, Pengfei Wang
Effect Of Snr Of Input Signal On The Accuracy Of A Ratiometric Wavelength Measurement System, Ginu Rajan, Qian Wang, Gerald Farrell, Yuliya Semenova, Pengfei Wang
Articles
The impact of a change in SNR of the input signal on the accuracy of a ratiometric wavelength measurement system is studied. The variation of the output ratio of the system due to the change in SNR of the input signal is modeled and the experimental investigation has been carried out, and both indicate that the accuracy is influenced significantly by variations in the SNR of the input signal. The demonstration example shows a wavelength shift of 0.055 nm when the SNR of the input signal varies from 47 dB to 42 dB (the measurable range is from 1500 nm …
Digital Radio In Canada: From Dab To Multi-Platform Approaches., Brian O'Neill
Digital Radio In Canada: From Dab To Multi-Platform Approaches., Brian O'Neill
Conference Papers
This paper examines the position of digital radio in Canada. It examines the Canadian experience of digital radio development from its introduction in 1995 to the present and asks whether the approach adopted and the lessons learned provide useful models for application elsewhere. Three main strands form the background to digital radio’s current stage of development: firstly, the introduction and early support for Digital Audio Broadcasting or (DAB) in the mid 1990s; secondly, the response of the radio industry to the internet and new media as complementary to traditional radio broadcasting provision; and thirdly, the more recent experience of the …
Polarization Dependence Of Bend Loss For A Standard Singlemode Fiber, Qian Wang, Ginu Rajan, Pengfei Wang, Gerald Farrell
Polarization Dependence Of Bend Loss For A Standard Singlemode Fiber, Qian Wang, Ginu Rajan, Pengfei Wang, Gerald Farrell
Articles
Polarization dependence of bend loss caused by the polymer coating layer for a standard singlemode fiber (SMF28) is investigated theoretically and experimentally. Bend loss for SMF28 for both the TE and TM mode is calculated separately. Normalized polarization dependent loss is proposed for the characterization of the polarization sensitivity of bend loss for different bend radii. Corresponding experimental tests are presented, which agree with the theoretical results. Both the theoretical and experimental results show that the polymer coating layer has a significant influence on the polarization dependence of bend loss.
User Quality Of Experience-Aware Multimedia Streaming Over Wireless Home Area Network, Gabriel-Miro Muntean, Nicola Cranley
User Quality Of Experience-Aware Multimedia Streaming Over Wireless Home Area Network, Gabriel-Miro Muntean, Nicola Cranley
Conference papers
For multimedia streaming over wireless networks, there is a trade-off between the capacity of the wireless links and the end-user perceived-quality, which can be affected by the compression scheme used, content characteristics and adaptation algorithm (if any). In this paper, this trade-off is investigated for streaming various motion content multimedia over an IEEE 802.11b-based Wireless-Home Area Network using the Quality-Oriented Adaptation Scheme (QOAS). QOAS performance is compared to that of a non-adaptive scheme when using MPEG-2 and MPEG-4 encoding in terms of average end-user perceived quality, number of streaming sessions concurrently supported, loss rate, delay, jitter and total throughput. Simulation …
An Open Approach To Contextualising Heterogeneous Cultural Heritage Datasets, John Mcauley, James Carswell
An Open Approach To Contextualising Heterogeneous Cultural Heritage Datasets, John Mcauley, James Carswell
Conference papers
This paper describes a semantic museum application, which aims to present a holistic impression of the Etruscan civilisation. Through the use of a distributed computing paradigm and the CIDOC CRM ontology, the system presents a unified view of a fragmented heritage, while supporting browse and search at a semantic level. Within the cultural heritage world, however, much value is placed on ‘context’, both in describing and presenting heritage artefacts. From this perspective, a platform built upon the distributed search paradigm, although useful in many respects, does not convey how an artefact sits within a broader setting. Narrative concepts are proposed …
Time For Real Values On Commercial Property, Lorcan Sirr
Comparison Of Stent Designs Using Computational Fluid Dynamics, Jonathan Murphy, Fergal Boyle
Comparison Of Stent Designs Using Computational Fluid Dynamics, Jonathan Murphy, Fergal Boyle
Conference Papers
Coronary artery disease (CAD) is one of the leading causes of death in the developed world. CAD occurs due to the build up of plaque in the coronary arteries which supply fresh blood to the constantly active heart muscle. Several methods exist to alleviate CAD such as coronary artery bypass grafting, balloon angioplasty and coronary stenting. A coronary stent is a small tubular prosthesis which can improve blood flow by acting as a scaffold to prop the diseased artery open. However, stent restenosis (re-blockage) remains a common problem with different stent designs leading to different restenosis rates. This work investigates …
Performance Characteristics Of A Therapeutic Ultrasound Wire Waveguide, Graham Gavin, Garrett Mcguinness, Finbar Dolan, M.S. Hashmi
Performance Characteristics Of A Therapeutic Ultrasound Wire Waveguide, Graham Gavin, Garrett Mcguinness, Finbar Dolan, M.S. Hashmi
Articles
Therapeutic ultrasound angioplasty has been investigated, clinically, by a number of researchers and represents a potentially promising therapy for the treatment of atherosclerotic lesions. To date, there has been no detailed analysis of the effect of mechanical design parameters, such as wire geometry or damping characteristics, on wire waveguide performance. An apparatus capable of delivering therapeutic ultrasound down small diameter nickel–titanium (NiTi) wire waveguides is described. The output peak-to-peak (p–p) displacements at the distal tip of a 1.0mm diameter waveguide were measured experimentally, by means of an optical microscope and image analysis software. The output was measured for a range …
The Effect Of Oil Swelling On The Fatigue Life Of Elastomers Subjected To Cyclic Bubble Inflation, Niall Murphy, John Hanley, Stephen Jerrams, Ali Hassan
The Effect Of Oil Swelling On The Fatigue Life Of Elastomers Subjected To Cyclic Bubble Inflation, Niall Murphy, John Hanley, Stephen Jerrams, Ali Hassan
Conference Papers
This paper describes the behaviour of rubber in multi-axial fatigue, with respect to oil resistance. A series of tests were carried out on EPDM specimens subjected to varying degrees of swelling. The control methodology and the loading mechanism employed in the testing of elastomers using dynamic multi-axial bubble inflation are outlined. Swollen specimens were prepared by immersing them in reference mineral oil. Specimens were cycled to failure and the results were analysed. The number of cycles to failure for a given engineering stress amplitude was plotted for both dry (unswollen) and swollen specimens. Fracture surfaces for each set of specimens …
Application Of Advanced Computational Modelling In The Comparison Of Stent Induced Coronary Flow Disturbances, Jonathan Murphy, Fergal Boyle
Application Of Advanced Computational Modelling In The Comparison Of Stent Induced Coronary Flow Disturbances, Jonathan Murphy, Fergal Boyle
Conference Papers
Coronary stent implantation can improve blood flow in an artery narrowed by the build up of arterial plaque. However, the haemodynamic effect of stent placement is unclear and may influence arterial restenosis (re-blockage). In this investigation computational fluid dynamics (CFD) was used to predict the non-Newtonian three-dimensional flow field in a coronary artery following implantation of two different stents. A graphical illustration of the stented areas affected to various degrees of wall shear stress (WSS) is presented for both the Palmaz-Schatz (PS) and the Gianturco-Roubin-II (GR-II) coronary stents. The axial WSS and wall shear stress gradient (WSSG) is also presented …
Evaluation Of Stent Design Based On The Haemodynamic Effect Of Coronary Stenting, Jonathan Murphy, Fergal Boyle
Evaluation Of Stent Design Based On The Haemodynamic Effect Of Coronary Stenting, Jonathan Murphy, Fergal Boyle
Conference Papers
No abstract provided.
Understanding Supply Chain Management, Edward Sweeney
Understanding Supply Chain Management, Edward Sweeney
Books/Book chapters
No abstract provided.
Water Quality Modelling In Dublin From Bray To Balbriggan Gdsds/75407/130, Aodh Dowley, Zeinab Bedri
Water Quality Modelling In Dublin From Bray To Balbriggan Gdsds/75407/130, Aodh Dowley, Zeinab Bedri
Reports
No abstract provided.
The Need For A Speech Corpus, Dermot Campbell, Ciaran Mcdonnell, Marty Meinardi, Bunny Richardson
The Need For A Speech Corpus, Dermot Campbell, Ciaran Mcdonnell, Marty Meinardi, Bunny Richardson
Articles
This paper outlines the ongoing construction of a speech corpus for use by applied linguists and advanced EFL/ESL students. The first section establishes the need for improvements in the teaching of listening skills and pronunciation practice for EFL/ESL students. It argues for the need to use authentic native-to-native speech in the teaching/learning process so as to promote social inclusion and contextualises this within the literature, based mainly on the work of Swan, Brown and McCarthy. The second part addresses features of native speech flow which cause difficulties for EFL/ESL students (Brown, Cauldwell) and establishes the need for improvements in the …
Perspectives On Supply Chain Management And Logistics - Creating Competitive Organisations In The 21st Century, Edward Sweeney
Perspectives On Supply Chain Management And Logistics - Creating Competitive Organisations In The 21st Century, Edward Sweeney
Books/Book chapters
No abstract provided.
Re-Engineering The Supply Chain: Making Scm Work For You, Edward Sweeney
Re-Engineering The Supply Chain: Making Scm Work For You, Edward Sweeney
Books/Book chapters
No abstract provided.
Preface To Perspectives On Supply Chain Management And Logistics :Creating Competitive Organisations In The 21st Century, Edward Sweeney
Preface To Perspectives On Supply Chain Management And Logistics :Creating Competitive Organisations In The 21st Century, Edward Sweeney
Books/Book chapters
No abstract provided.
Supply Chain Management: The Business Model Of The 21st Century, Edward Sweeney
Supply Chain Management: The Business Model Of The 21st Century, Edward Sweeney
Books/Book chapters
No abstract provided.
Supply Chain Benchmarking And Performance Measurement: Towards The Learning Supply Chain, Edward Sweeney
Supply Chain Benchmarking And Performance Measurement: Towards The Learning Supply Chain, Edward Sweeney
Books/Book chapters
No abstract provided.
Lifestyle Entrepreneurs And Spheres Of Inter-Firm Relations: The Case Of Westport Co. Mayo, Ireland, Ziene Mottiar
Lifestyle Entrepreneurs And Spheres Of Inter-Firm Relations: The Case Of Westport Co. Mayo, Ireland, Ziene Mottiar
Articles
A relatively small body of literature in tourism which concentrates on the issues of small firms and entrepreneurs and ‘this area of inquiry is vastly under-researched’ (Thomas, 2004, p.1). A key piece of research (Rimmington et al, 1999) classifies entrepreneurs in the tourism sector and one category which has received research attention has been that of lifestyle entrepreneurs. This article outlines the literature on lifestyle entrepreneurs and concludes that much of the focus to date has been on the individual entrepreneur. This current paper investigates how lifestyle entrepreneurs interact with other entrepreneurs in the destination in which they operate, and …
An Optimized Macrobending Fiber Based Edge Filter, Pengfei Wang, Gerald Farrell, Qian Wang, Ginu Rajan
An Optimized Macrobending Fiber Based Edge Filter, Pengfei Wang, Gerald Farrell, Qian Wang, Ginu Rajan
Articles
An optimized all-fiber edge filter is developed, based on a one-turn macrobending bare fiber structure. The discrimination range (DR) is 16.32 dB over a wavelength range from 1500 to 1600 nm, which can be employed for wavelength measurement applications. It offers a simpler structure compared to the previously developed macrobending fiber loss edge filters, without an increase in the polarization dependent loss (PDL).
An Optimized Macrobending Fiber Based Edge Filter, Pengfei Wang, Gerald Farrell, Qian Wang, Ginu Rajan
An Optimized Macrobending Fiber Based Edge Filter, Pengfei Wang, Gerald Farrell, Qian Wang, Ginu Rajan
Articles
An optimized all-fiber edge filter is developed, based on a one-turn macrobending bare fiber structure. The discrimination range is 16.32 dB over a wavelength range from 1500 to 1600 nm, which can be employed for wavelength measurement applications. It offers a simpler structure compared to the previously developed macrobending fiber loss edge filters, without an increase in the polarization-dependent loss.
Information Architecture For Irish Grocery Retailers Using Business Intelligence Tools, Patrick Doran
Information Architecture For Irish Grocery Retailers Using Business Intelligence Tools, Patrick Doran
Dissertations
Business Intelligence (BI) systems have a pivotal role to play in assisting retail management in the Irish grocery retail sector. The emergence of super chain stores and the increasing competition within this sector only increases their need for an effective and reliable Business Intelligence (BI) system. However, despite this growing need Business Intelligence (BI) systems as they are currently deployed and used are not supplying the various levels of management with the necessary information they require to make effective retail management decisions. The information and reports received from Business Intelligence (BI) systems lack structure, are missing important pieces of information …
A Framework For The Introduction Of Organisational Learning Using Web 2.0 Applications, Joseph M. Reynolds
A Framework For The Introduction Of Organisational Learning Using Web 2.0 Applications, Joseph M. Reynolds
Dissertations
We are now becoming more and more dependent on web technologies in our personal lives for our communication, information and entertainment needs. But what about using these skills and technologies for our business lives, could they transform the business world in the same way they have transformed our personal world? The purpose of this research was to investigate whether the latest web applications could be successfully implemented into an organisation who wished to transform itself into a modern and flexible organisation. This research was primarily focused on introducing organisational learning into the business through the use of new technology and …