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Current Search:
All of 'Electronic', '&', 'Electrical' and 'Engineering' in all fields;
454 items found
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Displaying Results 26 - 50 of 454 on page 2 of 19
Marked
Mark
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/583/
Marked
Mark
Graphics Hardware for Gradient Based Motion Estimation
(2004)
KOKARAM, ANIL CHRISTOPHER
Graphics Hardware for Gradient Based Motion Estimation
(2004)
KOKARAM, ANIL CHRISTOPHER
Abstract:
Motion estimation and compensation is a key component in video procesing. Motion estimation is necessary for high quality compression. It is also a key component in archive video restoration and motion picture post-production. Very accurate motion vectors are usually required in the latter two applications. More accurate motion vectors can also lead to greater coding efficiency. Real-time, accurate motion estimation is currently not attainable on standard desktop PCs. It usually requires some kind of dedicated hardware such as on video coding chips. Gradient based motion estimation is one which gives good accuracy for reasonable computational cost. This paper uses the Wiener based motion estimator as a vehicle to explore the acceleration of gradient based motion estimation on the PC
http://hdl.handle.net/2262/37027
Marked
Mark
Experimental study of high-temperature smectic- C FI2 phase in chiral smectic liquid crystals that exhibit phase-sequence reversal
(2008)
VIJ, JAGDISH KUMAR; PANARIN, YURI PETROVICH
Experimental study of high-temperature smectic- C FI2 phase in chiral smectic liquid crystals that exhibit phase-sequence reversal
(2008)
VIJ, JAGDISH KUMAR; PANARIN, YURI PETROVICH
Abstract:
We report the results of an experimental study of a recently observed phase sequence reversal of smectic-C<sub>FI2</sub><sup>*</sup> [SmC*(qT=1/2); a four layer antiferroelectric] phase appearing in the temperature range above the smectic-C* (SmC*) phase from the results of optical birefringence, spontaneous polarization, selective reflection, conoscopy, and dielectric spectroscopy. The SmC<sub>FI2</sub><sup>*</sup> phase is observed in an antiferroelectric liquid crystalline compound, 10OHF, in a temperature range above that of SmC* phase and is found to be thermodynamically monotropic, i.e., it appears only upon cooling from SmC<sub>alpha</sub><sup>*</sup> phase. This is also unstable as if it is once transformed to SmC* by the application of the bias, it does not return to its original state unless the sample is heated and cooled again in the absence of the bias. Nevertheless this phase is stabilized by the a...
http://hdl.handle.net/2262/29915
Marked
Mark
Flexible architecture software radio OFDM transceiver system and frame synchronization analysis
(2003)
DOYLE, LINDA; NOLAN, KEITH EDWARD
Flexible architecture software radio OFDM transceiver system and frame synchronization analysis
(2003)
DOYLE, LINDA; NOLAN, KEITH EDWARD
Abstract:
Abstract-In this paper, we present findings relating to frame synchronization algorithms for software radio based OFDM systems in addition to an overview of the design and implementation of an (OFDM) Software Radio based on a general-purpose processor (GPP) platform. The objectives of this work are to advance on existing research carried out in the area of reconfigurable wireless flexible architecture nodes, which are subject to multi-path fading, Doppler effects, and adjacent channel interference and have low cost yet robust and reliable operation requirements. We also include findings dealing with Bit Error Rate (BER) versus channel Signal to Noise Ratio (SNR) for BPSK and QPSK modulation schemes, and also the effect of non real-time Operating Systems (OS) running on GPPs on the transmitter processing time.
http://hdl.handle.net/2262/29887
Marked
Mark
Discriminitive Multi-Resolution Sub-Band and Segmental Phonetic Model Combination
(2000)
HARTE, NAOMI
Discriminitive Multi-Resolution Sub-Band and Segmental Phonetic Model Combination
(2000)
HARTE, NAOMI
Abstract:
peer-reviewed
A joint discriminative framework for multi-resolution sub-band HMMs and a hybrid segmental phonetic model is presented which combines independent likelihood scores using class dependent weightings trained to a minimum classification error criteria. This successfully extends the performance on a phonetic classification task to 76.3% compared to a full-band HMM score of 69.2%
http://hdl.handle.net/2262/25219
Marked
Mark
Automated Segmentation of Torn Frames using the Graph Cuts Technique
(2007)
CORRIGAN, DAVID; HARTE, NAOMI; KOKARAM, ANIL CHRISTOPHER
Automated Segmentation of Torn Frames using the Graph Cuts Technique
(2007)
CORRIGAN, DAVID; HARTE, NAOMI; KOKARAM, ANIL CHRISTOPHER
Abstract:
Film Tear is a form of degradation in archived film and is the physical ripping of the film material. Tear causes displacement of a region of the degraded frame and the loss of image data along the boundary of tear. In [1], a restoration algorithm was proposed to correct the displacement in the frame introduced by the tear by estimating the global motion of the 2 regions either side of the tear. However, the algorithm depended on a user-defined segmentation to divide the frame. This paper presents a new fully-automated segmentation algorithm which divides affected frames along the tear. The algorithm employs the graph cuts optimisation technique and uses temporal intensity differences, rather than spatial gradient, to describe the boundary properties of the segmentation. Segmentations produced with the proposed algorithm agree well with the perceived correct segmentation.
http://hdl.handle.net/2262/15559
Marked
Mark
Discontinuous change in the smectic layer thickness in ferrielectric liquid crystals
(2007)
PANOV, VITALY; VIJ, JAGDISH KUMAR; PANARIN, YURI PETROVICH
Discontinuous change in the smectic layer thickness in ferrielectric liquid crystals
(2007)
PANOV, VITALY; VIJ, JAGDISH KUMAR; PANARIN, YURI PETROVICH
Abstract:
The temperature dependence of the thickness of thick free-standing films is studied using a high-resolution film thickness measurement technique. A small discontinuity in the temperature dependence of the smectic layer thickness at every phase transition between ferro-, ferri-, and antiferroelectric phases is observed. We show that the major contribution to it arises from a change in the smectic tilt angle.
http://hdl.handle.net/2262/17665
Marked
Mark
Investigations of nano-scale helical pitch in SmCá* and SmC* phases of a chiral smectic liquid crystal using differential optical reflectivity measurements
(2006)
PANOV, VITALY; VIJ, JAGDISH KUMAR
Investigations of nano-scale helical pitch in SmCá* and SmC* phases of a chiral smectic liquid crystal using differential optical reflectivity measurements
(2006)
PANOV, VITALY; VIJ, JAGDISH KUMAR
Abstract:
Differential optical reflectivity (DOR) was used to study the temperature dependence of the short helical pitch in freestanding films of a liquid crystal compound. The experimentally measured DOR signal was fitted using Berreman's 4×4 matrix method to get the pitch value in the smectic-C (SmC) phase. The results show continuous evolution of the pitch between the smectic-C* and SmC phases. In SmC, the pitch decreases as temperature increases and is found to level off at 16±1 smectic layers at the SmC to smectic-A* transition.
http://hdl.handle.net/2262/17673
Marked
Mark
Investigations of nanoscale helical pitch in smectic-C and smectic-C* phases of a chiral smectic liquid crystal using differential optical reflectivity measurements
(2006)
VIJ, JAGDISH KUMAR
Investigations of nanoscale helical pitch in smectic-C and smectic-C* phases of a chiral smectic liquid crystal using differential optical reflectivity measurements
(2006)
VIJ, JAGDISH KUMAR
Abstract:
Differential optical reflectivity DOR was used to study the temperature dependence of the short helical pitch in freestanding films of a liquid crystal compound. The experimentally measured DOR signal was fitted using Berreman’s 4 4 matrix method to get the pitch value in the smectic-C * SmC * phase. The results show continuous evolution of the pitch between the smectic-C* and SmC * phases. In SmC * , the pitch decreases as temperature increases and is found to level off at 16±1 smectic layers at the SmC * to smectic-A* transition.
http://hdl.handle.net/2262/17669
Marked
Mark
Phase space Langevin equation for spin relaxation in a dc magnetic field
(2009)
COFFEY, WILLIAM THOMAS
Phase space Langevin equation for spin relaxation in a dc magnetic field
(2009)
COFFEY, WILLIAM THOMAS
Abstract:
A Langevin equation for the quantum Brownian motion of a spin of arbitrary size in a uniform external dc magnetic field is derived from the phase space master equation in the weak coupling and narrowing limits, for the quasiprobability distribution (Wigner) function of spin orientations in the configuration space of polar and azimuthal angles following methods long familiar in quantum optics. The closed system of differential-recurrence equations for the statistical moments describing magnetic relaxation of the spin is obtained as an example of applications of this equation.
http://hdl.handle.net/2262/38853
Marked
Mark
Quantum effects in the Brownian motion of a particle in a double well potential in the overdamped limit.
(2009)
CLEARY, LIAM; COFFEY, WILLIAM THOMAS
Quantum effects in the Brownian motion of a particle in a double well potential in the overdamped limit.
(2009)
CLEARY, LIAM; COFFEY, WILLIAM THOMAS
Abstract:
Quantum effects in the noninertial Brownian motion of a particle in a double well potential are treated via a semiclassical Smoluchowski equation for the time evolution of the reduced Wigner distribution function in configuration space allowing one to evaluate the position correlation function, its characteristic relaxation times, and dynamic susceptibility using matrix continued fractions and finite integral representations in the manner of the classical Smoluchowski equation treatment. Reliable approximate analytic solutions based on the exponential separation of the time scales of the fast intrawell and slow overbarrier relaxation processes are given. Moreover, the effective and the longest relaxation times of the position correlation function yield accurate predictions of both the low and high frequency relaxation behavior. The low frequency part of the dynamic susceptibility associated with the Kramers escape rate behaves as a single Lorentzian with characteristic frequency giv...
http://hdl.handle.net/2262/38851
Marked
Mark
Semiclassical treatment of a Brownian ratchet using the quantum Smoluchowski equation
(2009)
CLEARY, LIAM; COFFEY, WILLIAM THOMAS
Semiclassical treatment of a Brownian ratchet using the quantum Smoluchowski equation
(2009)
CLEARY, LIAM; COFFEY, WILLIAM THOMAS
Abstract:
Quantum effects in the noninertial Brownian motion of a particle in a one-dimensional ratchet potential are treated in the high temperature and weak bath-particle coupling limit by solving a quantum Smoluchowski equation for the time evolution of the Wigner function in configuration space. In particular, an analytical expression for the stationary average drift velocity for constant driving forces is presented including quantum corrections to any order in Planck’s constant. The corresponding frequency response is determined using continued fractions in both the linear approximation holding for small ac driving amplitude and in the nonlinear regime for arbitrary driving amplitude exhibiting pronounced ac induced frequency dependence of the dc component of the average drift velocity. Moreover, Shapiro steps are apparent in the dc characteristics for strong ac driving just as in the dc current-voltage characteristics of a point Josephson junction.
http://hdl.handle.net/2262/38852
Marked
Mark
Phase coherence theory for data-mining and analysis: application studies in spectroscopy
(2005)
PEROVA, TANIA; MOORE, ALAN
Phase coherence theory for data-mining and analysis: application studies in spectroscopy
(2005)
PEROVA, TANIA; MOORE, ALAN
Abstract:
The paper investigates from the perspective of computer science the phase coherence theory (PCT) and phase coherent data-scatter (PCD-S). These techniques were originally developed for the area of optical tensiographic data mining and analysis but have a more general application in data mining. These developments have recently been augmented with the engineering of a software toolkit called TraceMiner. Although the toolkit was originally devised for tensiography it was developed to perform as a generic data mining and analysis application with PCT, PCD-S and a range of other data mining algorithms implemented. To date the toolkit has been utilised in its main application area, tensiography, but has also been applied to UV-visible spectroscopy. This work presents a critical investigation of the general utility of PCT, PCD-S and the toolkit for data mining and analysis. A new application of PCT and the TraceMiner software toolkit to Raman spectroscopy is presented with discussion of t...
http://hdl.handle.net/2262/36846
Marked
Mark
Design of a switched reluctance machine drive for automotive applications
(2008)
Murphy, Anthony
Design of a switched reluctance machine drive for automotive applications
(2008)
Murphy, Anthony
http://doras.dcu.ie/546/
Marked
Mark
A Vocalisation-based Drawing Interface for Disabled Children
(2004)
Burke, Ted
A Vocalisation-based Drawing Interface for Disabled Children
(2004)
Burke, Ted
Abstract:
<p>In our work with disabled children at Ireland’s National Rehabilitation Hospital, a problem we have experienced in the facilitation of art activities is that traditional art materials and standard computer drawing programs sometimes prove inaccessible. In this paper, an original system, called “PaintMyVoice” is presented which facilitates the creation of two or three-dimensional images using a variety of novel input modalities. In particular, vocalisations can be used to create original images of a variety of objects, including trees, flowers and landscape elements. Additional input to the system can optionally be provided via mouse, keyboard, switch interface or digital camera depending on the abilities of the user. Here, the program’s user interface is described, with an emphasis on accessibility features. The signal processing techniques used to measure various vocal characteristics including intensity, pitch and other spectral characteristics are outlined. The means of ...
http://arrow.dit.ie/teapotart/5
Marked
Mark
Preliminary Results for a Monocular Marker-Free Gait Measurement System
(2006)
Courtney, Jane; dePaor, Annraoi
Preliminary Results for a Monocular Marker-Free Gait Measurement System
(2006)
Courtney, Jane; dePaor, Annraoi
Abstract:
<p>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.</p>
http://arrow.dit.ie/biodevart/4
Marked
Mark
A New Eccentric Geomagnetic Dipole to give the Correct Dip Pole Locations
(2006)
De Paor, Annraoi; Burke, Ted
A New Eccentric Geomagnetic Dipole to give the Correct Dip Pole Locations
(2006)
De Paor, Annraoi; Burke, Ted
Abstract:
<p>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.</p>
http://arrow.dit.ie/teapotart/3
Marked
Mark
A System for Monitoring Pressures and Spinal Curvature in Spinally Injured People Immobilised on a Spinal Raft
(2004)
De Frein, Ruairi; Flinn, Eoin; Burke, Ted
A System for Monitoring Pressures and Spinal Curvature in Spinally Injured People Immobilised on a Spinal Raft
(2004)
De Frein, Ruairi; Flinn, Eoin; Burke, Ted
Abstract:
<p>We present a system designed to study the pressure at various ‘hot spots’ on the back of the body and the deformation of the spine experienced by a patient when strapped to a spinal board, and the potential alleviation of both by the addition of an inflatable “spinal raft” (or other similar device). In measuring pressure we devised a system of air-filled sacks interfaced with a PC. Each sack, placed under a particular key point on the body, is inflated until its faces just begin to separate and a switch thereby opens. The pressure reading is then captured and displayed by the computer. Seeking a non-invasive method of measuring the curvature of the vertebral column, we discovered that we could use a magnetometer to measure the vertical displacement of magnetically-tagged vertebrae from a fixed horizontal plane. The results of our study will be employed by an independent body to determine the merits or demerit of the spinal raft.</p>
http://arrow.dit.ie/teapotart/1
Marked
Mark
A general purpose electromechanical simulator for switches used in the rehabilitation of communication-impaired people
(2004)
Connolly, Niamh; Burke, Ted; De Paor, Annraoi
A general purpose electromechanical simulator for switches used in the rehabilitation of communication-impaired people
(2004)
Connolly, Niamh; Burke, Ted; De Paor, Annraoi
Abstract:
The importance of simple mechanical switches in rehabilitation cannot be overstated, particularly in the facilitation of communication and control by people with profound physical disabilities. Many communication and control systems are designed to be operable using a single switch (or a small number of switches). A crucial step in the tailoring of a system to a patient who will operate it in this way is the selection of an appropriate switch, according to their physical abilities. We present a prototype switch simulator, capable of reproducing various types of switching action under computer control. This electromechanical device exhibits a force versus displacement characteristic (possibly incorporating hysteresis) selected by the user on the PC. In this way, the suitability of a variety of switching actions for a patient can be assessed, and the optimal choice identified. Furthermore, for patients with very particular needs, this device can implement switching actions which are d...
http://arrow.dit.ie/teapotart/2
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Comparative Evaluation of two Models of UPQC for Suitable Interface to Enhance Power Quality
(2007)
Basu, Malabika; Das, S. P.; Dubey, Gopal
Comparative Evaluation of two Models of UPQC for Suitable Interface to Enhance Power Quality
(2007)
Basu, Malabika; Das, S. P.; Dubey, Gopal
Abstract:
<p>Majority of the dispersed generations from renewable energy sources are connected to the grid through power electronic interface, which introduce additional harmonics in the distribution systems. Research is being carried out to integrate active filtering with specific interface such that a common power quality (PQ) platform could be achieved. For generalized solution, a unified power quality conditioner (UPQC) could be the most comprehensive PQ protecting device for sensitive non-linear loads, which require quality input supply. Also, load current harmonic isolation needs to be ensured for maintaining the quality of the supply current. The present paper describes two control scheme models for UPQC, for enhancing PQ of sensitive non-linear loads. Based on two different kinds of voltage compensation strategy, two control schemes have been designed, which are termed as UPQC-Q and UPQC-P. A comparative loading analysis has developed useful insight in finding the typical appli...
http://arrow.dit.ie/engscheleart2/3
Marked
Mark
Production and Storage of Hydrogen
(2009)
Muller, Michael, (Thesis)
Production and Storage of Hydrogen
(2009)
Muller, Michael, (Thesis)
Abstract:
<p>The Faculty of Electrical Engineering and Information Technology at the University of Applied Science in Darmstadt runs several hydrogen-related experiments at their fuel cell laboratory. In cooperation with the Dublin Institute of Technology (DIT), a new project was started in 2007. The aim of this project was to develop an energy storage system, which would work with hydrogen as a high quality energy storage. This system was developed for using the electricity of solar panels in order to run an electrolyser. Hydrogen is produced and afterwards stored in an adequate storage tank. Once the hydrogen has been stored, it can be used by a fuel cell to produce electricity again, anytime energy is needed. The main difficulty of this project consists in storing the maximum amount of hydrogen with the minium loss of the energy needed for the periphery (cleaning, drying, storing).</p>
http://arrow.dit.ie/engmas/34
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The Probabilistic Integration of Demand-Side Load and Generation in a Representative Irish Distribution Network
(2012)
Sunderland, Keith; Conlon, Michael
The Probabilistic Integration of Demand-Side Load and Generation in a Representative Irish Distribution Network
(2012)
Sunderland, Keith; Conlon, Michael
Abstract:
<p>This paper introduces a methodology for investigating the behaviour of a distribution network incorporating both load variations and variable micro-wind generation output. The probabilistic methodology is applied to a representative model of the Irish Distribution Network. Application of a selection of commercially available micro-wind turbines to the model is investigated for a range of load and generation scenarios based on a standard load profile and varying mean wind speed. Analysis of the results of the analysis forms the basis for defining the limitations of the methodology but also presents the opportunities for future work.</p>
http://arrow.dit.ie/engscheleart/172
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Unified Power Quality Conditioner: protection and performance enhancement
(2008)
Axente, Iurie, (Thesis)
Unified Power Quality Conditioner: protection and performance enhancement
(2008)
Axente, Iurie, (Thesis)
Abstract:
<p>The proliferation of power electronics-based equipment has produced a significant impact on the quality of electric power supply. Nowadays, much of the equipment is based on power electronic devices, often leading to problems of power quality. At the same time this equipment is typically equipped with microprocessor-based controllers which are quite sensitive to deviations from the ideal sinusoidal line voltage. Conventional power quality mitigation equipment is proving to be inadequate for an increasing number of applications, and this fact has attracted the attention of power engineers to develop dynamic and adjustable solutions to power quality problems. One modern and very promising solution that deals with both load current and supply voltage imperfections is the Unified Power Quality Conditioner (UPQC). This thesis investigates the development of UPQC protection scheme and control algorithms for enhanced performance. This work is carried out on a 12 kVA prototype UPQC...
http://arrow.dit.ie/engdoc/11
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An Electrooculogram-based Binary Saccade Sequence Classification (BSSC) Technique for Augmentative Communication and Control
(2009)
Keegan, Johnalan; Burke, Ted; Condron, James
An Electrooculogram-based Binary Saccade Sequence Classification (BSSC) Technique for Augmentative Communication and Control
(2009)
Keegan, Johnalan; Burke, Ted; Condron, James
Abstract:
In the field of assistive technology, the electroocu-logram (EOG) can be used as a channel of communication and the basis of a man-machine interface. For many people with severe motor disabilities, simple actions such as changing the TV channel require assistance. This paper describes a method of detecting saccadic eye movements and the use of a saccade sequence classification algorithm to facilitate communication and control. Saccades are fast eye movements that occurs when a person's gaze jumps from one fixation point to another. The classification is based on pre-defined sequences of saccades, guided by a static visual template (e.g. a page or poster). The template, consisting of a table of symbols each having a clearly identifiable fixation point, is situated within view of the user. To execute a particular command, the user moves his or her gaze through a pre-defined path of eye movements. This results in a well-formed sequence of saccades which are translated into a comma...
http://arrow.dit.ie/teapotcon/3
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A Comparison of Studies Conducted in Wales and Ireland on Issues Affecting Uptake of Micro-Generation Training
(2009)
Harrison, Alan E; Irvine, SJC; O’Farrell, K; Stafford, A; Woolmington, T
A Comparison of Studies Conducted in Wales and Ireland on Issues Affecting Uptake of Micro-Generation Training
(2009)
Harrison, Alan E; Irvine, SJC; O’Farrell, K; Stafford, A; Woolmington, T
Abstract:
<p>In 2007 Irvine and Stafford [1] surveyed the attitude to the need for enhanced renewable education within groups of Electricians, Architects and Chemists in Wales. Similar groups were surveyed in Ireland in 2008. In comparing the attitudes of students in these two countries the principal differences are governmental support for microgeneration, the quantity of installed microgeneration and the year of the survey. The two countries are broadly similar in terms of geography, climate, population size, ethnicity, broadcast media, educational achievements, economy and income spread.</p> <p>In Ireland there is greater support for governmental intervention and for increased levels of installation. This could be a reaction to the very low level of activity that prevails in Ireland. The rapid changes during 2008 in economic outlook and in Climate Change consensus may have impacted on the responses. In many areas addressed in the survey the disciplines adopted a consensus...
http://arrow.dit.ie/engscheleart/175
Displaying Results 26 - 50 of 454 on page 2 of 19
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