Digital Commons Network^™

Sequential Labelling And Acoustic Emission Analysis Of Damage Occurring In Cortical Bone During Indentation Cutting, Ger Reilly, Ashkan Safari, David Taylor, Brendan Mccormack

Conference Papers

When a surgeon uses a wedge shaped blade or an osteotome to cut cortical bone during an operative procedure the bone will fail by a process of microcracking and primary crack propagation. It has previously been observed that crack propagation is dependent on the direction of cutting relative to the main axis of the bone. It has also been observed that microcracks occurring during fracture release acoustic signals that facilitate real-time monitoring of a cutting process. In these novel studies, we labelled damage accumulation during cutting of cortical bone using sequential chelating dyes and we correlated recorded AE signals during …

Performance Evaluation Of Resource Usage For Unicast Video Streaming Over Ieee 802.11 Wlan Networks, Nicola Cranley, Mark Davis

Conference papers

Multimedia streaming applications are a demanding and challenging service to deliver over wireless networks. Such services have a large impact on the resource requirements of the WLAN. However, there are many variables involved in video streaming, such as the video content being streamed, how the video is encoded and how it is sent. This makes the role of radio resource management and the provision of QoS guarantees extremely difficult. In this paper we investigate the network resource requirements for three scenarios: a single unicast video streaming session; multiple unicast video streaming sessions and finally multiple unicast streaming sessions in the …

An Assessment Of The Audio Codec Performance In Voice Over Wlan (Vowlan) Systems, Miroslaw Narbutt, Mark Davis

Conference papers

In this paper we present results of experimental investigation into the performance of three audio codecs (ITU-T G.711, G.723.1 and G.729A) under varying load conditions on a Voice over WLAN system utilizing the IEEE 802.11b wireless LAN standard. The analysis is based upon a new technique for estimating user satisfaction of speech quality calculated from packet delay and packet loss/late measurements. We also demonstrate the importance of the de-jitter buffer playout scheme for insuring speech quality. From our results we conclude that the use of the G.711 audio codec in conjunction with the new adaptive playout scheme gives the highest …

Electromagnetic Measurement Of Spinal Curvature, Ronan Fitzmaurice, Ted Burke, Annraoi De Paor

Conference Papers

In this paper, we describe an original mathematical technique for calculating the position and orientation of an electromagnetic coil from a minimum of four collinear magnetic field measurements. This problem arose in the development of a system for evaluating the efficacy of inflatable back rafts designed to mitigate complications that arise from the immobilisation of patients with suspected spinal injuries on spinal boards during transport to hospital. Electromagnetic markers are attached to points of interest on the back of an immobilised test subject. Spinal curvature is then measured by passing a magnetometer underneath the board.

Challenges For Corporate Foresight: Towards Strategic Prospective Through Scenario Thinking, John Ratcliffe

Conference papers

No abstract provided.

Will Using A Constructivist Approach Improve Laboratory Work For Phase 6 Electrical Apprentices?, Francis Ashworth

Theses

This study used action research to implement a constructivist approach in the delivery of the electronics and measurements laboratory classes for a phase six group of electrical apprentices in the Electrical Services Engineering Department of the Technologicl University Dublin. The aim of the study was to investigate if the constructivist approach adopted, with a research group, could improve the effectiveness of the two labs. The research group consisted of sixteen, phase six, male electrical apprentices for both the electronics and measurements labs. The students ranged in ages between eighteen and twenty five years of age and were a randomly selected …

Manufacture Of Near Net Shaped 3-Dimensional Components For Industrial Applications, David Kennedy, Donal Brosnan

Conference Papers

The development of near net shape 3-Dimensional products for industrial applications has been one main goal for Manufacturing Industries over the last few decades. Processes such as polymer blow moulding and its various stages of development, glass forming, extrusion, forging, centrifugal and sand casting, bulge forming and vacuum forming are typical processes that have contributed to this development. Current practices centre on Surface coatings, Rapid Prototyping, laser forming and nanotechnology manufacture of complex 3-D shapes and assemblies. The work described in this paper is a new and highly efficient and cost effective technique for producing 3-Dimensional thin walled shapes by …

Assessing The Quality Of Voip Transmission Affected By Playout Buffer Scheme, Miroslaw Narbutt, Mark Davis

Conference papers

Delay, echo, encoding scheme, and packet loss all influence perceived quality of conversational speech transmitted over packet networks. Therefore, the choice of a buffer algorithm cannot be solely based on statistical loss/delay trade-off metrics. Also subjective “listening tests” or the newer ITU-T PESQ method, which don’t consider the effect of mouth-to-ear delay are inappropriate. We proposed a method for assessing VoIP call quality by extending the ITU-T E-model concept. This method provides a direct link to perceived conversational speech quality by estimating user satisfaction from the combined effect of information loss, delay and echo.

Bs News

Building Services Engineering

No abstract provided.

Thermal Efficiency Characteristics Of Indirect Evaporative Cooling Systems, Ben Costelloe, Donal Finn

Conference Papers

Recent developments in enhancing heat transfer in cooling towers, together with the success of chilled ceilings, have prompted a review of the evaporative cooling technique. in temperate maritime climates. The thermal efficiency of such systems is a key parameter, as a measure of the degree to which the system has succeeded in exploiting the cooling potential of the ambient air. This paper presents the results of experimental research into the thermal efficiency of a water-side open indirect evaporative cooling test rig designed to achieve low (1-4 K) approach conditions. Secondary efficiencies in the range 0.24-0.76 have been achieved.

Developing A Participatory Consultation Process For Quality Reviews:The Initial Stage Of The European University Associations Quality Review Of The Technological University Dubin, Aidan Kenny

Articles

This paper describes the evolution of a consultation process utilized by the Technological University Dubin (DIT) as part of a quality review process. An emphasis is placed on outlining: the collaborative nature of the enquiry; the guidelines and code of ethics adopted; the social research methodology utilized both quantitative (online surveys, staff n=1831, student’s n=21094) and qualitative (6 staff focus groups n=45 and 4 stakeholder focus groups n=24 and faculty board submissions 6). Instrument construction, theme sheet design and sampling procedures and response rate are detailed. The author, as consultation facilitator, provides an narrative of events and applies theory to …

Friction And Adhesion In Rigid Surface Indentation Of Nitrile Rubber, Stephen Jerrams

Articles

When a rigid body in the form of a plane strain indentor is forced into an elastomer, the asperities on the surface of the indentor are filled by the softer material. As depth of ingress increases, the rubber displaced into the indentor asperities exhibits stick-slip behaviour. The rubber adheres to the rigid body and if the depth of ingress is held at a maximum, the level of adhesion remains constant despite short-term load relaxation occurring in the rubber.

This text describes the influence of a range of factors on indentation forces and adhesion in rigid indentation of hydrogenated nitrile rubbers. …

Changing To A Student-Centred Paradigm: The Why, What And How, Mike Murphy

Presentations

No abstract provided.

Bs News

Building Services Engineering

No abstract provided.

Contradictions In Irish Academic Research, Stephen Jerrams, John Donovan

Articles

The conditions that govern academic research vary greatly from country to country and research in the Republic of Ireland was and remains markedly different from that of its larger European neighbours and the United States. Despite the quality of its education system and the excellent reputation of its universities, until recently Ireland had relatively low levels of academic research. Pinnacles of excellence could be found in certain disciplines, but state funding was low and issues relating to industrial collaborations, international partnerships, commercialisation and the exploitation of Intellectual Property (IP) rarely arose. Even today the Irish Government’s spending on academic research, …

Bs News

Building Services Engineering

No abstract provided.

Edit, Dublin Institute Of Technology Students' Union Magazine, March, 2005, Dit: Students' Union

DIT Student Union

DITSU update, Rag week, Elections 2005.

Bs News

Building Services Engineering

No abstract provided.

Water Conservation And Resuse Strategy For Ireland, Liam Mccarton, Sean O'Hogain

Articles

The traditional approach to meeting increased demand is to augment supply. However, mobilising new resources involves ever higher costs. Increasing water efficiency by reducing the amount of water required to accomplish a given task can significantly contribute towards balancing supply and demand. The water saved as a result of PCC reduction can be used to augment existing supplies. This can be the least cost option, particularly when the environmental and social costs of developing new resources are included in the analysis. Allied to this is the concept of sustainability, which can be defined as ‘development that meets the needs of …

Outsourcing:A Magic Solution?, Edward Sweeney

Practitioner Journals

No abstract provided.

Bs News

Building Services Engineering

No abstract provided.

An Investigation Of The Heat Affected Zone In Cortical Bone Sawing, Hamid Khalili Parsa, Ger Reilly, Brendan Mccormack, Andrew Macey

Conference Papers

Surgical procedures such as osteotomy and hip replacement involve the cutting of bone with the aid of various manual and powered cutting instruments including manual and powered bone saws. Frictional rubbing between the blade of the saw and the bone results in the generation of localised heating of the cut bone and increased cutting forces (Ark et al, 1997). Overheating in localised areas can cause bone necrosis and have an impact on the rate of healing of the bone post operation and overheating also affects the sharpness life of the blade. A review of the literature indicates that work has …

Development Of A Process Modelling System For Simulation, John Ryan

Other resources

This thesis details the development of a process modelling technique to aid a simulation model developer during the requirements gathering and conceptual modelling phases of a simulation project.

There are a number of process modelling techniques available that are capable of being used during such phases of a simulation project, however there is currently a lack of process modelling techniques developed specifically to aid a simulation model developer in capturing, representing and communicating information and systems issues to persons involved in the operation of discrete systems under investigation.

A detailed review of the literature related to techniques capable of supporting …

Creating The Human Resources For Enhancing Innovation In Regional Economies, Brendan Goldsmith

Conference papers

No abstract available

Innovation, Vol. 3, Issue 1, September, 2005, Unknown

Issues

No abstract provided.

Electronic Purchasing Consortia: A Future Procurement Direction, Bernd Huber, Edward Sweeney, Austin Smyth

Books/Book chapters

No abstract provided.

Study Of Transmission Response Of Edge Filters Employed In Wavelength Measurements, Qian Wang, Gerald Farrell, Thomas Freir

Articles

The ratiometric wavelength-measurement system is modeled and an optimal design of transmission response of the employed edge filter is demonstrated in the context of a limited signal-to-noise ratio of the signal source. The corresponding experimental investigation is presented. The impact of the limited signal-to-noise ratio of the signal source on determining the optimal transmission response of edge filters for a wavelength-measurement application is shown theoretically and experimentally.

2005 : Part-Time Programmes, Dublin Institute Of Technology

DIT Publications

Book containing map of DIT main locations, frequently asked questions, key contacts and full listing of part-time programmes on offer at DIT 2005.

Digital Image Processing, Jonathan Blackledge

Books/Book chapters

Newspapers and the popular scientific press today publish many examples of highly impressive images. These images range, for example, from those showing regions of star birth in the distant Universe to the extent of the stratospheric ozone depletion over Antarctica in springtime, and to those regions of the human brain affected by Alzheimer’s disease. Processed digitally to generate spectacular images, often in false colour, they all make an immediate and deep impact on the viewer’s imagination and understanding.

Professor Jonathan Blackledge’s erudite but very useful new treatise Digital Image Processing: Mathematical and Computational Methods explains both the underlying theory and …

Using Technology To Support Project And Problem-Based Learning, Roisin Donnelly

Books/Book Chapters

This chapter is aimed at supporting lecturers in universities and colleges who have begun or are considering introducing project or problem-based learning (PBL) for students’ learning. In order to keep up with rapid change and make the most of learning technologies as aids to both learning strategies, a range of practical insights based on research will be provided in sections, supplemented with a variety of examples of learning technology being infused into both strategies. The range provided are by no means exhaustive, and you may know of many more examples yourself. It is unlikely that any one student would experience …