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Displaying Results 1 - 25 of 454 on page 1 of 19
Marked
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Electronic slide matching and enhancement of a lecture video
(2007)
KOKARAM, ANIL CHRISTOPHER; PITIE, FRANCOIS
Electronic slide matching and enhancement of a lecture video
(2007)
KOKARAM, ANIL CHRISTOPHER; PITIE, FRANCOIS
Abstract:
This paper presents an automatic method to enhance video presentations for distance learning applications. From a material recorded by a fixed, non professional camera, the system matches the slides displayed during the presentation with their electronic versions. The process to achieve slide recognition consists of two phases. In the first phase, the location where the slides are displayed is located by colour matching. Then a shot detection is performed in the display area and a frame is selected for each slide displayed in the video. The second phase consists of matching the frames previously selected to the electronic version of the slides. Using correlation measure, a likelihood is computed for each electronic slide to correspond to the slides displayed in the frames selected. A prior distribution is then defined to model the probability of each possible slide transition. Finally the most probable sequence of slides displayed in the video is determined using the Viterbi algorit...
http://hdl.handle.net/2262/24577
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Electronic Tunability of Ferroelectric Liquid Crystal Infiltrated Photonic Crystal Fibre
(2009)
Mathews, Sunish; Semenova, Yuliya; Farrell, Gerald
Electronic Tunability of Ferroelectric Liquid Crystal Infiltrated Photonic Crystal Fibre
(2009)
Mathews, Sunish; Semenova, Yuliya; Farrell, Gerald
Abstract:
The electronic tunability of ferroelectric liquid crystal filled photonic crystal fibres is demonstrated for the first time. The tunability is obtained in the wavelength range of 1500 -1600 nm, with a free spectral range of ~ 20 nm. The electronic tunability is achieved by applying an electric field onto the infiltrated photonic crystal fibre which facilitates the photonic bandgap tuning owing to the microsecond order switching speeds of Ferroelectric Liquid crystals. The polarized transmission spectrum shows the behavior of a tunable notch filter with a change in applied voltage. The results obtained could pave the way for the fabrication of fast tunable all-in-fibre devices in the telecom wavelength range.
http://arrow.dit.ie/engscheceart/73
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Electronic Speckle Pattern Shearing Interferometry for Nondestructive Testing of Thermal Sprayed Alloy Coatings
(2005)
Xue, Qiang
Electronic Speckle Pattern Shearing Interferometry for Nondestructive Testing of Thermal Sprayed Alloy Coatings
(2005)
Xue, Qiang
Abstract:
<p>Thermal sprayed coatings have wide engineering applications. There now exists a wide range of destructive and nondestructive testing (NDT) methods for surface coating inspections. This paper describes an application of electronic speckle pattern shearing Interferometry (ESPI) for NDT of thermal sprayed surface coatings. In contrast to other conventional methods such as eddy current,ultrasonic or X-ray, ESPSI allows fast and large survey area inspection. Experimental results of shearographic measurements are presented. Thermal sprayed coatings were tested using ESPI. Delaminations of the coatings were detected and the fringe patterns were captured using this method. It is shown that the shearography technique can be applied successfully to surface coating qualitiy inspection and is very effective for delamination detection.</p>
http://arrow.dit.ie/engschmeccon/9
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Does a Link Exist Between Examination Performance and Lecture Attendance for First Year Engineering Students ?
(2011)
O'Dwyer, Aidan
Does a Link Exist Between Examination Performance and Lecture Attendance for First Year Engineering Students ?
(2011)
O'Dwyer, Aidan
Abstract:
<p>The objective of this study is to examine if a link exists between lecture attendance and examination performance of Level 7, Year 1, Electrical Engineering students at Dublin Institute of Technology in the Electrical Systems subject. Lecture attendance was monitored and analysed over four academic years (2007-8, 2008-9, 2009-10 and 2010-11). The average lecture attendance for students in the three academic years from 2007-10 was 55%, increasing noticeably in the 2009-10 academic year. A statistically significant weakly positive correlation between lecture attendance and examination performance was established. Each 10% increase in student attendance at lectures improved both Module 1 examination and terminal examination performance by approximately 3% on average, a finding similar to that reported in other studies.</p>
http://arrow.dit.ie/engscheleart/166
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Electrical, Optical and acoustic diagnostics of atmospheric pressure gas discharges
(2011)
O'Connor, Niall
Electrical, Optical and acoustic diagnostics of atmospheric pressure gas discharges
(2011)
O'Connor, Niall
Abstract:
This thesis presents original diagnostic investigations of atmospheric pressure gaseous discharges, operating in owing helium and helium with low concentrations (0.1 - 1 %) of gas admixtures, together with novel biomedical surface functionalisations. The initial body of this work focuses on comprehensive electrical and optical diagnostics of the operation of an industrial scale dielectric barrier discharge (DBD), maintained in a 10 l/min w of both helium and helium with 1% admixed oxygen. The experimental results reveal a coupling between the power dissipated in the discharge and the discharge homogeneity which, in turn, correlates to a shift in the power supply operating frequency and species optical emission intensities. The shift in the operating frequency is shown to be dependent upon increased charge deposition on the electrodes, as the input power is increased, thus changing the overall system capacitance through charge-voltage LIssajous gure analyses. Furthermore it is demo...
http://doras.dcu.ie/16570/
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An FPGA-based stereoscopic camera - electronic design tools and techniques
(2010)
Andorko, Istvan; Corcoran, Peter M.; Bigioi, Petronel
An FPGA-based stereoscopic camera - electronic design tools and techniques
(2010)
Andorko, Istvan; Corcoran, Peter M.; Bigioi, Petronel
Abstract:
Electronic design tools and techniques for the implementation of a stereoscopic camera based on an FPGA (Field Programmable Gate Array) are presented. The stages of an IPP (Image Processing Pipeline) are presented together with the development tools and languages used to implement a stereoscopic camera in hardware. In a further development of the basic system, aspects of the implementation of a 3D camera are presented.
http://hdl.handle.net/10379/1438
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Variation of features of interframe dependent HMM for speech recognition
(1998)
HARTE, NAOMI
Variation of features of interframe dependent HMM for speech recognition
(1998)
HARTE, NAOMI
Abstract:
peer-reviewed
The effects are explored of using different dynamic features in conjunction with an HMM that permits a dependency on both preceeding and succeeding frames. In particular, features which capture dynamic information are vaned in the interframe dependent HMM. A recognition accuracy of 93.9% for the Connex speaker-independent E-set was obtained using tied states
http://hdl.handle.net/2262/25281
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Characterisation of Macro-porous Silicon for Electronic Applications
(2003)
PEROVA, TANIA; MOORE, ALAN
Characterisation of Macro-porous Silicon for Electronic Applications
(2003)
PEROVA, TANIA; MOORE, ALAN
Abstract:
Micro-Raman spectroscopy was used in this study for the analysis of the influence of process conditions on the strain and stress in macro-porous layers. As expected, it was found that oxidation results in significant wafer bending, depending on the layer porosity. The magnitude of stress of about 0.33 GPa was found for ma-PS sample with lattice constant of 4 μm while for sample with the lattice constant of 12 μm it was only 0.175 GPa. Dissolution of the oxide layer restores the flatness of the samples after the first oxidation. Repetition of the oxidation cycles leads to a “memory effect”, as the residual deformation increases. The results are consistent with results obtained for similar samples using X-ray diffractometry and topography and curvature measurements.
http://hdl.handle.net/2262/36866
Marked
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The Human Eye Position Control System in a Rehabilitation Setting
(2005)
Nolan, Yvonne; Burke, Ted; Boylan, C.; De Paor, Annraoi
The Human Eye Position Control System in a Rehabilitation Setting
(2005)
Nolan, Yvonne; Burke, Ted; Boylan, C.; De Paor, Annraoi
Abstract:
<p>Our work at Ireland’s National Rehabilitation Hospital involves designing communication systems for people suffering from profound physical disabilities. One such system uses the electro-oculogram, which is an (x,y) system of voltages picked up by pairs of electrodes placed, respectively, above and below and on either side of the eyes. The eyeball has a dc polarisation between cornea and back, arising from the photoreceptor rods and cones in the retina. As the eye rotates, the varying voltages projected onto the electrodes drive a cursor over a mimic keyboard on a computer screen. Symbols are selected with a switching action derived, for example, from a blink. Experience in using this mode of communication has given us limited facilities to study the eye position control system. We present here a resulting new feedback model for rotation in either the vertical or the horizontal plane, which involves the eyeball controlled by an agonist-antagonist muscle pair, modelled by a ...
http://arrow.dit.ie/teapotart/4
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Development of a Tool for Windfarm Site Analysis in Electrical Networks with High Levels of Wind Power Generation
(2011)
Carroll, Edward; McGrory, John
Development of a Tool for Windfarm Site Analysis in Electrical Networks with High Levels of Wind Power Generation
(2011)
Carroll, Edward; McGrory, John
Abstract:
<p>Controlling electrical networks that contain high levels of wind power will be a challenge facing many System Operators in the coming years. The intermittency and uncertainty of the power supplied by wind turbines create difficulties surrounding scheduling of plant, operating reserve and grid integration. The current process for windfarm selection is carried out by an individual stakeholder and lacks the consideration for all other stakeholders involved, which can create problems in the long term when the levels of wind power increase on the network. This paper proposes a collective approach to analysing potential windfarm sites using the key factors which influence the windfarm output and integration into the network. The wind resource and generation outputs are examined using state of the art analysis software to discover and rate the values of the factors which influence these variables. A spreadsheet incorporating these factors is developed and evaluated, which allows s...
http://arrow.dit.ie/engscheledis/6
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Investigation of Wave Farm Electrical Network Configurations
(2011)
Sharkey, Fergus; Conlon, Michael; Gaughan, Kevin
Investigation of Wave Farm Electrical Network Configurations
(2011)
Sharkey, Fergus; Conlon, Michael; Gaughan, Kevin
Abstract:
<p>Wave Energy Converters (WECs) have been in development for a number of decades and some devices are now close to becoming a commercial reality. As such, pilot projects are being developed, particularly in the UK and Ireland, to deploy WECs on a pre-commercial array scale. There is little experience in the wave energy or utility industry of designing and installing electrical networks for WEC arrays with the closest comparison being offshore wind farms. There are some key features of WECs which will ultimately dictate thatthe electrical configuration differs from that of offshore wind farms.</p> <p>This paper investigates the potential representative electrical network configurations for small (10MW), medium (40MW) and large scale (150MW) ‘wave farms’ in order to establish a development path for such projects. The configurations are evaluated for efficiency (power loss), redundancy and short circuit levels. Key interfaces in the electrical infrastructure are ide...
http://arrow.dit.ie/engscheleart/161
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A Parametric Analysis of Domestic Electricity Consumption Patterns in Ireland
(2011)
McLoughlin, Fintan; Duffy, Aidan; Conlon, Michael
A Parametric Analysis of Domestic Electricity Consumption Patterns in Ireland
(2011)
McLoughlin, Fintan; Duffy, Aidan; Conlon, Michael
Abstract:
<p><strong>This paper reports findings from a study of electrical load profiles obtained from a survey of a representative cross section of approximately 4,000 Irish dwellings. Electricity demand was recorded at half-hourly intervals for each dwelling over a six month period from 1st July 2009 to 31st December 2009. Descriptive statistics are shown for each electrical parameter such as mean, maximum demand, load factor and time of use (ToU) of electricity consumption. The mean power demand and daily mean load factor of the sample was 0.512kW and 23.43% respectively for all dwellings over the monitoring period. A mean daily maximum demand of 2.5kW was recorded for the sample. The most frequent ToU for maximum and minimum electricity consumption over the monitoring period was 18:00 - 18:30 and 06:30 – 07:00 respectively. </strong></p>
http://arrow.dit.ie/dubencon2/65
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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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Mechancial Characterization of Unplasticised Polyvinylchloride Thick Pipes Using Electronic Speckle Pattern Interferometry
(2004)
Mihaylova, Emilia; Potelon, Benjamin; Reddy, Shridhar; Toal, Vincent; Smith, Ciaran
Mechancial Characterization of Unplasticised Polyvinylchloride Thick Pipes Using Electronic Speckle Pattern Interferometry
(2004)
Mihaylova, Emilia; Potelon, Benjamin; Reddy, Shridhar; Toal, Vincent; Smith, Ciaran
Abstract:
<p>In this work a number of techniques (electronic speckle pattern interferometry, holographic interferometry, strain gauge and finite element method) are brought to bear in order to establish consistency in the results of strain measurement. This is necessary if optical nondestructive testing methods, such as those used here, are to gain acceptance for routine industrial use. The FE model provides a useful check. Furthermore, ESPI fringe data facilitates the extension of FE models, an approach that is of growing importance in component testing. The use of in-plane and out-of-plane sensitive electronic speckle pattern interferometry (ESPI) for non-destructive material characterization of thick unplasticised polyvinylchloride (uPVC) pipes is presented. A test rig has been designed for stressing pipes by internal pressure. ESPI gives a complete mapping of the displacement field over the area imaged by the video camera. The results for the strain of uPVC obtained from ESPI data a...
http://arrow.dit.ie/cieoart/68
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Establishing a Solution Strategy for Electrical Demand Forecasting in Ireland
(2002)
Fay, Damien; Ringwood, John V.; Condon, Marissa; Kelly, Michael
Establishing a Solution Strategy for Electrical Demand Forecasting in Ireland
(2002)
Fay, Damien; Ringwood, John V.; Condon, Marissa; Kelly, Michael
Abstract:
Electrical demand is driven by economic and human activity, which has obvious daily, weekly and yearly cycles as well as a long-term trend and special periods such as bank holidays, Christmas etc., all of which are reflected in load data. These characteristics of electrical demand must inevitably be incorporated into any demand-forecasting model. However, with the exception of a few papers, the vast bulk of the literature on electrical demand forecasting is concerned with forecasting techniques. This paper proposes several methods with which to quantify the characteristics of Irish electrical load data prior to modelling.
http://eprints.nuim.ie/1968/
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Analysis of Engineering Students Learning Styles on Level 7, Level 8 and Level 9 Programmes
(2010)
O'Dwyer, Aidan
Analysis of Engineering Students Learning Styles on Level 7, Level 8 and Level 9 Programmes
(2010)
O'Dwyer, Aidan
Abstract:
This contribution reports on research, carried out over three academic years, into the learning styles of engineering students, on a number of Level 7, Level 8 and Level 9 programmes at DIT, using the index of learning styles survey developed by Felder and Soloman (1991). The contribution explores the results obtained in detail, placing them particularly in the national context. The correlation between student performance and individual learning styles is examined. Knowledge of the strongly visual learning style of these cohorts of students may be used to improve the learning environment.
http://arrow.dit.ie/engscheleart/127
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Dynamic Electrical Ratings and the Economics of Capacity Factor for Wave Energy Converter Arrays
(2011)
Sharkey, Fergus; Bannon, Elva; Conlon, Michael; Gaughan, Kevin
Dynamic Electrical Ratings and the Economics of Capacity Factor for Wave Energy Converter Arrays
(2011)
Sharkey, Fergus; Bannon, Elva; Conlon, Michael; Gaughan, Kevin
Abstract:
<p>Wave Energy Converters (WECs) have been in development for several decades with some devices now coming close to commercial realities. As such, pilot projects are being developed, particularly in the UK and Ireland, to deploy WECs on a pre-commercial array scale. The ultimate ambition is to have multiple WECs installed in a ‘wave farm’ in a similar fashion to offshore wind farms. For large scale wind farms the inter-array and export electrical systems can represent more than 20% of the project’s capital expenditure. Submarine power cables account for a large proportion of this cost. The same is expected to hold true for wave farms.</p> <p>This paper investigates the possibility of underrating and dynamically rating the electrical inter-array and export cable systems for wave farms in order to assess the cost savings that can be made. This paper will also look at a simulated WEC array power output time series. The aim is to establish whether the electrical equip...
http://arrow.dit.ie/engscheleart/167
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Experiences of Assessment Using Multiple Choice Questions On Advanced Modules Taken By Level 8 and Level 9 Engineering Students
(2010)
O'Dwyer, Aidan
Experiences of Assessment Using Multiple Choice Questions On Advanced Modules Taken By Level 8 and Level 9 Engineering Students
(2010)
O'Dwyer, Aidan
Abstract:
This contribution evaluates the use of multiple-choice questions, in both formative and summative assessment modes, on advanced modules taken by Level 8 and Level 9 engineering students, over the past two academic years. Assessment data, and student experiences with the assessment methods, are reported and analysed.
http://arrow.dit.ie/engscheleart/131
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On numerical methods for highly oscillatory problems in circuit simulation
(2009)
Condon, Marissa; Deaño, Alfredo; Iserles, Arieh; Maczynski, Kornel; Xu, Tao
On numerical methods for highly oscillatory problems in circuit simulation
(2009)
Condon, Marissa; Deaño, Alfredo; Iserles, Arieh; Maczynski, Kornel; Xu, Tao
Abstract:
We propose in this paper a novel technique for an efficient numerical approximation of systems of highly oscillatory ordinary differential equations. In particular, we consider electronic systems subject to modulated signals. A Filon-type method is proposed for use and compared with traditional trapezoidal rule and Runge–Kutta methods. The Filontype method is combined with the waveform relaxation technique for nonlinear systems. Preliminary numerical examples highlight the efficacy of this approach.
http://doras.dcu.ie/15245/
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Forecasting Electrical Load Using a Multi-time-scale Approach
(1999)
Ringwood, J.V.; Murray, F.T.
Forecasting Electrical Load Using a Multi-time-scale Approach
(1999)
Ringwood, J.V.; Murray, F.T.
Abstract:
This paper describes the application of a multi-time-scale technique to the modelling and forecasting of short-term electrical load. The multi-time-scale technique is based on adjusting the underlying short sampling period forecast time series with specific target points and possible aggregated demand. This allows not only improvement of the short sampling period forecast, but also focuses on weighting the accuracy of the forecast at certain critical points e.g. the overnight minimum and daily peaks. Various model types may be utilised at the upper level (forecating the aggregated consumption and target points at daily level), including intelligent models such as neural and fuzzy models, but the base model is currently restricted to a linear form. Results for the Irish national electrical grid demonstrate the effectiveness of the technique.
http://eprints.nuim.ie/1963/
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The high frequency electrical properties of interconnects on a flexible polyimide substrate including the effects of humidity
(2011)
McGibney, Eoin; Barton, John; Floyd, Liam; Tassie, Paul; Barrett, John
The high frequency electrical properties of interconnects on a flexible polyimide substrate including the effects of humidity
(2011)
McGibney, Eoin; Barton, John; Floyd, Liam; Tassie, Paul; Barrett, John
Abstract:
Science Foundation Ireland (NAP-72); Science Foundation Ireland (CSET - Centre for Science, Engineering and Technology, Grant No. 07/CE/11147); Ireland’s EU Structural Funds Programme 2007–2013, co-funded by the Irish Government and the European Union, in the Fourth Cycle of the Programme for Research in Third Level Institutions “PRTLI-IV” as part of the M-Zones Research Programme
Accepted Version
Flexible circuit board materials can be used to advantage in radio frequency and high-speed digital systems but an obstacle to their use is the lack of availability of information on the electrical properties of materials to high frequencies and, in particular, the variation in dielectric constant and loss tangent as a function of frequency. This makes accurate electromagnetic simulation of high frequency flexible interconnects difficult. The variation of the electrical properties of these materials as a function of environmental parameters, such as humidity, is also unknown at hig...
http://hdl.handle.net/10468/422
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Gaussian Process Prior Models for Electrical Load Forecasting
(2004)
Leith, Douglas J. ; Heidl, Martin; Ringwood, John V.
Gaussian Process Prior Models for Electrical Load Forecasting
(2004)
Leith, Douglas J. ; Heidl, Martin; Ringwood, John V.
Abstract:
This paper examines models based on Gaussian Process (GP) priors for electrical load forecasting. This methodology is seen to encompass a number of popular forecasting methods, such as Basic Structural Models (BSMs) and Seasonal Auto-Regressive Intergrated (SARI) as special cases. The GP forecasting models are shown to have some desirable properties and their performance is examined on weekly and yearly Irish load data.
http://eprints.nuim.ie/1938/
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Rapid Thermal Oxidation of Ge-rich Strained Layers
(2004)
PEROVA, TANIA; MOORE, ALAN
Rapid Thermal Oxidation of Ge-rich Strained Layers
(2004)
PEROVA, TANIA; MOORE, ALAN
Abstract:
In this paper, we repolt for thejirsr time the electrical properties ofultrathin oxides grown using rapid thermal oxidation (RTO) on strained Ge-rich layers on relaxed-SiGe buffers. Rapid thermal oxidation on strained Ge-rich layer is employed to prevent strain relaxation. Electrical properties of MOS capacitors fabricatcd using RTO grown oxides directly on strained Ge-rich ]has been studied in detail using capacitance-voltage (C-V), conductance-voltage (G-V) and current-voltage (I-V) characteristics. Interface trap density, fixed oxide charge density, the frequency dispersion and hysteresis effects of the oxide have been determined. From the I-V characteristics, the current conduction mechanism has also been studied. RTO grown oxides show good electrical properties and may find applications in the future generation Ge-CMOS as a gate dielectric
http://hdl.handle.net/2262/36686
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Investigations of ultra shallow junction ion implanted biaxial tensile strained silicon by means of X-Ray, Raman and photoacoustic techniques
(2012)
Horan, Ken
Investigations of ultra shallow junction ion implanted biaxial tensile strained silicon by means of X-Ray, Raman and photoacoustic techniques
(2012)
Horan, Ken
Abstract:
The application of strain to the active channel region of the metal-oxide-semiconductor-field-effect-transistor (MOSFET) has become a necessary practice in integrated circuit (IC) fabrication. The introduction of strain allows increased carrier mobilities, and concomitant device performance enhancements, which are independent of MOSFET scaling. Biaxial tensile strained silicon ("-Si), resulting from epitaxial growth of silicon on a Si1!xGex virtual substrate gives rise to enhanced electron mobilities and, for certain dopants, increased electrical activation. For these reasons it is the material of interest in this thesis. The prospects for industrial implementations of "-Si are heavily dependent on the effects of device processing steps, and the controllability of defect and dopant profiles. Of special interest to the current work is the suitability of "-Si subjected to low energy antimony implants and low thermal budget rapid thermal anneal (RTA), for the production of u...
http://doras.dcu.ie/16775/
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Value-Chain Engineering of a Tower-Top Cellular Base Station System
(2007)
Cooper, Tim; Farrell, Ronan
Value-Chain Engineering of a Tower-Top Cellular Base Station System
(2007)
Cooper, Tim; Farrell, Ronan
Abstract:
In this paper we present a value chain analysis of mobile `phone basestations, with a focus on possible antenna based tower-top electronics. Through this analysis we are able to present a number of possible architectural solutions and provide guidance on performance and reliability criterion
http://eprints.nuim.ie/2720/
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