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Articles 7681 - 7710 of 9167
Full-Text Articles in Entire DC Network
The Impact Of Tcp Sliding Window On The Performance Of Ieee 802.11 Wlans, Enrique Roques Gomez, Mark Davis
The Impact Of Tcp Sliding Window On The Performance Of Ieee 802.11 Wlans, Enrique Roques Gomez, Mark Davis
Conference papers
In this paper the TCP sliding window mechanism is experimentally investigated as one of the possible causes of the unfairness often observed as IEEE802.11 wireless LANs. We show how by appropriately sizing the sliding window it is possible to re-introduce fairness into the operation of the WLAN.
Preliminary Results For A Monocular Marker-Free Gait Measurement System, Jane Courtney, Annraoi Depaor
Preliminary Results For A Monocular Marker-Free Gait Measurement System, Jane Courtney, Annraoi Depaor
Articles
This paper presents results from a novel monocular marker-free gait measurement system. The system was designed for physical and occupational therapists to monitor the progress of patients through therapy. It is based on a novel human motion capture method derived from model-based tracking. Testing is performed on two monocular, sagittal-view, sample gait videos – one with both the environment and the subject’s appearance and movement restricted and one in a natural environment with unrestricted clothing and motion. Results of the modelling, tracking and analysis stages are presented along with standard gait graphs and parameters.
A New Eccentric Geomagnetic Dipole To Give The Correct Dip Pole Locations, Annraoi De Paor, Ted Burke
A New Eccentric Geomagnetic Dipole To Give The Correct Dip Pole Locations, Annraoi De Paor, Ted Burke
Articles
In this paper, we describe a new eccentric dipole model of the Earth’s magnetic field. The constraints under which the conventional eccentric dipole model is defined result in predicted dip pole locations that differ significantly from the measured locations. Here, we give a preliminary exposition of a new dipole model which, because it is constrained by the observed dip pole locations, overcomes this problem.
The Computerised Design Of Prestressed Cncrete Slabs, Ronan Hogan
The Computerised Design Of Prestressed Cncrete Slabs, Ronan Hogan
Masters
This thesis was aimed at the development of a finite element based software package for the analysis and design of prestressed concrete slabs. Many of the existing packages used in this area carry out a simplified two dimensional analysis of the slab which does not account for the secondary stresses set up by the presence of openings and notches in the slab. In an attempt to overcome this particular weakness, a finite element analysis package was written to help produce a more rigorous analysis of the stresses developed in prestressed concrete. The aims of the research were the examination of …
Don't Go There: When To Abandon Lesson Plans And Venture, Humbly, Into Ground Zero, Sue Norton
Don't Go There: When To Abandon Lesson Plans And Venture, Humbly, Into Ground Zero, Sue Norton
Articles
This paper discusses pedagogical styles that are appropriate in the classroom.
Thermal Performance Of Low Approach Evaporative Cooling Systems In Buildings, Ben Costelloe, Donal Finn
Thermal Performance Of Low Approach Evaporative Cooling Systems In Buildings, Ben Costelloe, Donal Finn
Conference Papers
Meteorological enthalpy analysis of temperate and maritime climates above 45˚N suggests that the water-side evaporative cooling technique has considerable unrealised potential with contemporary "high temperature" building cooling systems - such as chilled ceilings. As low approach conditions are the key to exploiting the cooling potential of the ambient air, thermal performance at such conditions needs to be investigated. To address the research issues a test rig, based on an open cooling tower and plate heat exchanger and designed to maximise evaporative cooling potential, has been constructed at DIT. A combination of experimental measurement and analysis is used in the investigations. …
Solar Energy Conversion Through Seaweed Photosynthesis With Combustion In A Zero-Emission Power Plant, Evgeny Yantovski, Jim Mcgovern
Solar Energy Conversion Through Seaweed Photosynthesis With Combustion In A Zero-Emission Power Plant, Evgeny Yantovski, Jim Mcgovern
Other resources
A proposed ‘closed cycle’ power plant scheme, referred to as SOFT (Solar Oxygen Fuel Turbine), is described. The scheme involves the cultivation of macroalgae in a pond, combustion of their organic matter in a fluidised bed boiler that generates steam for a Rankine cycle steam power plant and the return of the combustion products to the pond to feed the algae. Oxygen, equivalent to that used for combustion, is re-released to the atmosphere by photosynthesis, while the carbon dioxide that is produced by combustion is absorbed by photosynthesis and thereby recycled. It is proposed that the seaweed Ulva, which is …
Resource And Technology Issues: Case Studies, Mike Murphy
Resource And Technology Issues: Case Studies, Mike Murphy
Presentations
No abstract provided.
Digital Technologies And The Future Of Radio: Lessons From The Canadian Experience, Brian O'Neill
Digital Technologies And The Future Of Radio: Lessons From The Canadian Experience, Brian O'Neill
Conference Papers
This paper reports on an ongoing comparative study of the development of digital radio in Europe and Canada. Focussing on the Eureka 147 Digital Audio Broadcasting (DAB) platform in Canada, of which it was an early adopter, the paper examines the complex interaction of industry, government regulation and the difficulty of policy formation matching the pace of technology development. Based on interviews with leading radio professionals, the paper presents a critical review of the ‘transitional policy’ towards the digitalisation of radio and examines the international market pressures that led Canada to largely abandon this approach in favour of the current …
From The Management Of Distribution To The Management Of Supply Chains: The Evolution Of Scm, Edward Sweeney
From The Management Of Distribution To The Management Of Supply Chains: The Evolution Of Scm, Edward Sweeney
Practitioner Journals
No abstract provided.
Integrated Antenna For Multiband Multi-National Wireless Combined With Gsm1800/Pcs1900/Imt2000 + Extension, Matthias John, Max Ammann
Integrated Antenna For Multiband Multi-National Wireless Combined With Gsm1800/Pcs1900/Imt2000 + Extension, Matthias John, Max Ammann
Articles
A printed triple-band monopole antenna appropriate for use as a terminal antenna in modern wireless multiband systems is proposed. The impedance bandwidth of each band has been optimised using a quasi-Newton technique and the bandwidth includes virtually all wireless bands. Various parameter sweeps are presented which improve our understanding of the antenna, in particular, the effect of groundplane-size and branch-off point on impedance bandwidth and radiation pattern.
Using Case-Based Reasoning For Spam Filtering, Sarah Jane Delany
Using Case-Based Reasoning For Spam Filtering, Sarah Jane Delany
Doctoral
pam is a universal problem with which everyone is familiar. Figures published in 2005 state that about 75% of all email sent today is spam. In spite of significant new legal and technical approaches to combat it, spam remains a big problem that is costing companies meaningful amounts of money in lost productivity, clogged email systems, bandwidth and technical support. A number of approaches are used to combat spam including legislative measures, authentication approaches and email filtering. The most common filtering technique is content-based filtering which uses the actual text of the message to determine whether it is spam or …
Cutting Rate Effect On Temperature During Cortical Bone Sawing, Hamid Khalili Parsa, Ger Reilly, Brendan Mccormack
Cutting Rate Effect On Temperature During Cortical Bone Sawing, Hamid Khalili Parsa, Ger Reilly, Brendan Mccormack
Conference Papers
When bone is cut the occurrence of thermal damage to the bone is of major concern to the surgeon. If the temperature exceeds 44°C for longer than 1 min, bone repair is impaired (Eriksson et al, 1984) and necrosis may occur. Repeated use of cutting blades may reduce the cutting efficiency (Wevers et al, 1987; Toksvig-Larsen et al, 1992). Wevers et al also found that there is a greater force required to cut cortical bone using a blunt saw compared to new one.
Indentation Fracture Of Bovine Cortical Bone: Acoustic Emission Technique, Ashkan Safari, Ger Reilly, Brendan Mccormack
Indentation Fracture Of Bovine Cortical Bone: Acoustic Emission Technique, Ashkan Safari, Ger Reilly, Brendan Mccormack
Conference Papers
Indentation cutting may result in microcracking and main crack growth which was previously reported. In this study, we recorded the AE signals produced by cracking processes during cutting on cortical bone, measuring the cutting force and correlating between load-displacement curves and AE activities.
The Use Of Relationship Marketing In Developing Network And Co-Operative Links Within Tourism Product Marketing Groups (Pmg’S, Catherine Gorman
The Use Of Relationship Marketing In Developing Network And Co-Operative Links Within Tourism Product Marketing Groups (Pmg’S, Catherine Gorman
Books / Book chapters
Co-operative marketing groups are common in tourism, particularly in the case of destination marketing. Destination tourism marketing groups offer a diverse range of tourism products and experiences which complement each other and are delineated by a specific geographical parameter. Tourism product marketing groups offer similar tourism products or services and through a co-operative approach focus on an identified target markets. Co-operative marketing can make greater impact in terms of market presence and can be more cost effective. Members need to see the value in their membership in order to remain involved. Many tourism product providers are SMTE’s (Small and Medium …
Low-Cost Wavelength Measurement Based On A Macrobending Single-Mode Fiber, Qian Wang, Gerald Farrell, Thomas Freir, Ginu Rajan, Pengfei Wang
Low-Cost Wavelength Measurement Based On A Macrobending Single-Mode Fiber, Qian Wang, Gerald Farrell, Thomas Freir, Ginu Rajan, Pengfei Wang
Articles
A low-cost all-fiber wavelength measurement technique is proposed and demonstrated. A macrobending standard single-mode fiber is developed as an edge filter with an optimal design and simple surface processing. A ratiometric wavelength measurement system employing the developed macrobending fiber filter demonstrates a resolution of∼10 pmin a wavelength range from1500to1560 nmwith ease of assembly and calibration.
Design Of Integrated Polarization Beam Splitter With Liquid Crystal, Qian Wang, Gerald Farrell, Yuliya Semenova
Design Of Integrated Polarization Beam Splitter With Liquid Crystal, Qian Wang, Gerald Farrell, Yuliya Semenova
Articles
An integrated polarization beam splitter based on a directional coupler (DC) with an etched slot and filled-in liquid crystal covering layer, which utilizes the birefringence of liquid crystal materials, is proposed. A supermode solution for the DC involving birefringence materials and the corresponding full-vector anisotropic beam propagation method are employed as modeling tools. A numerical design of the proposed structure is presented. Beam propagation behavior along the whole structure involving curved input and output regions and central coupling region is simulated. Simulation result shows an extinction ratio of 25.3 and 41.9 dB for the TE and TM mode, respectively.
A Novel Gps Patch Antenna On A Fractal Hi-Impedance Surface Substrate, Xiulong Bao, Giuseppe Ruvio, Max Ammann, Matthias John
A Novel Gps Patch Antenna On A Fractal Hi-Impedance Surface Substrate, Xiulong Bao, Giuseppe Ruvio, Max Ammann, Matthias John
Articles
A compact high-performance circularly-polarized microstrip antenna for the global positioning system application is proposed. It comprises a fractal hi-impedance surface electromagnetic bandgap (EBG) structure printed on a high permittivity substrate. Measurements and simulation of return loss and axial ratio are in good agreement. It is shown that the proposed Global Positioning System antenna has good axial ratio performance in the upper half-plane, an improvement in gain and a significantly wider axial ratio bandwidth when compared to the same antenna without EBG
Process Modeling For Simulation, John Ryan, Cathal Heavey
Process Modeling For Simulation, John Ryan, Cathal Heavey
Articles
This paper discusses shortfalls in relation to the requirements gathering phases of simulation. While many developments have taken place around supporting the model coding task of simulation, there are few tools available to assist in the requirements gathering phase. This is surprising as it has been reported by several researchers that the requirements phase can absorb twice as much resources as the coding phase. There are numerous process modeling tools available (over 100) that can and have been used to support the requirements phase of simulation. This paper provides a selective review of some of the most important in relation …
Geographic Variation Of Solar Water Heater Performance In Europe, Y. Yohanis, O. Popel, S. Frid, Brian Norton
Geographic Variation Of Solar Water Heater Performance In Europe, Y. Yohanis, O. Popel, S. Frid, Brian Norton
Articles
Solar water heater (SWH) performance has been analysed using the ‘number of days’ method for 147 different sites in all European countries. The total number of days that the temperature of delivered solar heated water reaches or exceeds specified demand temperatures is correlated with solar radiation on a horizontal surface for summer, warm half-year, and whole year periods. Maps are presented and discussed showing the contours for the number of days that an illustrative SWH met different hot water demand temperatures. Correlations between number of days water is provided at a specified temperature and solar fractions for the same periods …
Addressing The Challenges That Are Emerging In The Continued Increase In Ppp Use In The Republic Of Ireland, Louis Gunnigan, David Eaton
Addressing The Challenges That Are Emerging In The Continued Increase In Ppp Use In The Republic Of Ireland, Louis Gunnigan, David Eaton
Conference papers
The Irish Government’s Public-Private Partnership (PPP) programme of pilot projects is now reaching its conclusion and PPP has become established as a key element in the strategy for provision of public sector facilities. Compiled through a literature review as part of a PhD level research project, this paper examines organisational culture differences between the public and private sectors and assesses the potential affect of these differences on the future development of the Irish PPP programme. By relating organisational culture differences to the emerging challenges relating to risk, value and innovation, it is evident that the lack of a partnering environment …
Case Studies Of Good Practice In The Assessment Of Student Learning In Higher Education, Roisin Donnelly
Case Studies Of Good Practice In The Assessment Of Student Learning In Higher Education, Roisin Donnelly
Books/Book Chapters
There are two modules on the certificate programme. Module one is entitled ‘Learning and Teaching in Higher Education’. The aim of this module is to provide teachers in higher education with a wide range of practical learning and teaching methods, including the use of relevant learning technologies that will help their students learn more effectively. They will gain solid background knowledge in recognised theories and national and international best practices in learning and teaching in higher education so that they understand the reasons for choosing certain teaching strategies.
Sound Source Separation Using Shifted Non-Negative Tensor Factorisation, Eugene Coyle, Derry Fitzgerald, Matt Cranitch
Sound Source Separation Using Shifted Non-Negative Tensor Factorisation, Eugene Coyle, Derry Fitzgerald, Matt Cranitch
Conference papers
Recently, shifted non-negative Matrix Factorisation was developed as a means of separating harmonic instruments from single channel mixtures. However, in many cases two or more channels are available, in which case it would be advantageous to have a multichannel version of the algorithm. To this end, a shifted Non-negative Tensor Factorisation algorithm is derived, which extends shifted Non-negative Matrix Factoristiaon to the multi channel case. The use of this algorithm for multi-channel sound source separation of harmonic instruments is demonstrated. Further, it is shown that the algorithm can be used to perform Non-negative Tensor Deconvolution, to separate sound sources which …
Voice Activated Command And Control With Speech Recognition Over Wifi, Brian Nolan, Tony Ayres
Voice Activated Command And Control With Speech Recognition Over Wifi, Brian Nolan, Tony Ayres
Articles
This paper presents work conducted to date on the development of a voice activated command and control framework specifically for the control of remote devices in a ubiquitous computing environment. The prototype device is a Java controlled Lego Mindstorm robot. The research considers three different scenario configurations. A recognition grammar for command and control of the robot has been created and implemented in Java, in part in the recognition engine and in part on the robot. The physical topology involves Java at each node endpoint, that is, at the handheld PC (iPaq), the PC workstation, the Linux server and onboard …
Need To Limber Up On Supply Chain Management, Edward Sweeney
Need To Limber Up On Supply Chain Management, Edward Sweeney
Practitioner Journals
No abstract provided.