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Current Search:
All of 'Electronic' and 'Engineering' in all fields;
908 items found
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Displaying Results 76 - 100 of 908 on page 4 of 37
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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
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An Analysis Framework for Electronic Health Record Systems
(2011)
Bisbal, Jesus; Berry, Damon
An Analysis Framework for Electronic Health Record Systems
(2011)
Bisbal, Jesus; Berry, Damon
Abstract:
Background: The timely provision of complete and up-to-date patient data to clini-cians has for decades been one of the most pressing objectives to be fulfilled by infor-mation technology in the healthcare domain. The so-called e lectronic health record (EHR), which provides a unified view of all relevant clinical data, has received much attention in this context from both research and industry. This situation has given rise to a large number of research projects and commercial products that aim to address this challenge. Different projects and initiatives have attempted to address this challenge from various points of view, which are not easily comparable. Objectives: This paper aims to clarify the challenges, concepts, and approaches in-volved, which is essential in order to consistently compare existing solutions and objec-tively assess progress in the field. Methods: This is achieved by two different means. Firstly, the paper will identify the most significant issues that differ...
http://arrow.dit.ie/teapotcon/26
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A Compact Electronic Speckle Pattern Interferometry System using a Photopolymer Reflection Holographic Optical Element
(2011)
Reddy, Sridhar; Jallapuram, Raghavendra; Toal, Vincent; Naydenova, Izabela; Martin, Suz...
A Compact Electronic Speckle Pattern Interferometry System using a Photopolymer Reflection Holographic Optical Element
(2011)
Reddy, Sridhar; Jallapuram, Raghavendra; Toal, Vincent; Naydenova, Izabela; Martin, Suzanne; Mintova, Svetlana
Abstract:
<p>A simple and compact electronic speckle pattern interferometry system using a reflection holographic optical element is presented. The reflection holographic optical element is recorded on an acrylamide based photopolymer formulated and prepared at the Centre for Industrial & Engineering Optics. Light intensity of 40mW/cm2 with an exposure time of 60 seconds was used in fabricating the holographic optical element. The vibration mode patterns of a 4 cm diameter thin circular sheet of brass metal attached to a 4 cm diameter paper cone loud speaker are presented.</p>
http://arrow.dit.ie/cieocon2/15
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An Investigation of the use of a High Resolution ADC as a Digital Biopotential Amplifier
(2011)
Berry, Damon; Duignan, Frank; Hayes, Richard
An Investigation of the use of a High Resolution ADC as a Digital Biopotential Amplifier
(2011)
Berry, Damon; Duignan, Frank; Hayes, Richard
Abstract:
Sigma delta analogue to digital converters have been used in many signal processing applications including some commercially available systems for sampling of bio-signals Bio-potential amplifiers have traditionally utilised specialised highquality analogue components to amplify bio-signals. The central aim of this work is to investigate the benefits of using high-resolution sigma delta conversion as a digital amplification stage in the signal path of a bio-potential amplifier. A number of system arrangements specific to bio-potential measurement are presented and discussed. These arrangements are designed to use the high resolution capacity of the sigma delta converter in different ways, providing different benefits. To explore these benefits, the authors have implemented a digital bio-potential signal capture system consisting of a sigma delta converter interfaced to a PC running MATLAB via an inexpensive microcontroller and to test it with a number of test signals. A signal gener...
http://arrow.dit.ie/teapotcon/22
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A mobile ECG monitoring system with context collection
(2009)
Li, Jin Peng; Berry, Damon; Hayes, Richard
A mobile ECG monitoring system with context collection
(2009)
Li, Jin Peng; Berry, Damon; Hayes, Richard
Abstract:
Preventative health management represents a shift from the traditional approach of reactive treatment-based healthcare towards a proactive wellness-management approach where patients are encouraged to stay healthy with expert support when they need it, at any location and any time. This work represents a step along the road towards proactive, preventative healthcare for cardiac patients. It seeks to develop a smart mobile ECG monitoring system that requests and records context information about what is happening around the subject when an arrhythmia event occurs. Context information about the subject’s activities of daily living will, it is hoped, provide an enriched data set for clinicians and so improve clinical decision making. As a first step towards a mobile cardiac wellness guideline system, the authors present a system which can receive bio-signals that are wirelessly streamed across a body area network from Bluetooth enabled electrocardiographs. The system can store signals ...
http://arrow.dit.ie/teapotcon/24
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Degree Extension for Technicians (DEFT)
(2004)
Devitt, F.; Monaghan, K.; Ringwood, J.; Villing, R.; Ward, T.
Degree Extension for Technicians (DEFT)
(2004)
Devitt, F.; Monaghan, K.; Ringwood, J.; Villing, R.; Ward, T.
Abstract:
The Degree Extension for Technicians (DEFT) programme addresses a particular niche in Irish engineering education by offering qualified technicians (currently working in Irish electronics industry) an opportunity to undertake, principally via the Internet, a flexible learning programme leading to a professional engineering degree. This paper addresses the various aspects that make such a mode of learning appropriate to the programme and also looks at the motivation behind the decision to develop a new virtual learning environment (VLE) in-house. The paper also documents the implementation of a challenging project schedule which brought the DEFT programme and VLE to fruition over a 10-month period. The current status of the project, together with experiences to date, conclude the paper.
http://eprints.nuim.ie/1315/
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Augmented control of hands free voice prostheses
(2008)
Madden, Brian; Condron, James; Burke, Ted; Coyle, Eugene
Augmented control of hands free voice prostheses
(2008)
Madden, Brian; Condron, James; Burke, Ted; Coyle, Eugene
Abstract:
Laryngectomy patients often use an electrolarynx to facilitate speech following a tracheotomy. Devices of this type provide the most intelligible means of communication for tracheotomy patients. However, the electro-larynx has inherent drawbacks such as the buzzing monotonic sound emitted, the need for a free hand to operate the device, and the difficulty experienced by many tracheotomy patients in adapting to use it. The most effective means of addressing the shortcomings of existing electro-larynges is to provide the user with a hands-free facility. This allows the user to perform other manual tasks whilst speaking, or simply to communicate more effectively through body language. Hands-free devices do exist but require a considerable amount of patient training as they involve the use of the shoulder muscles to control pitch. Furthermore, they are not suitable for all patients as the hands-free is suitable only for users with a certain type of tracheotomy. Goldstein et al in 2004 [...
http://arrow.dit.ie/teapotcon/1
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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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Content based image pose manipulation
(2009)
Begley, Seán
Content based image pose manipulation
(2009)
Begley, Seán
Abstract:
This thesis proposes the application of space-frequency transformations to the domain of pose estimation in images. This idea is explored using the Wavelet Transform with illustrative applications in pose estimation for face images, and images of planar scenes. The approach is based on examining the spatial frequency components in an image, to allow the inherent scene symmetry balance to be recovered. For face images with restricted pose variation (looking left or right), an algorithm is proposed to maximise this symmetry in order to transform the image into a fronto-parallel pose. This scheme is further employed to identify the optimal frontal facial pose from a video sequence to automate facial capture processes. These features are an important pre-requisite in facial recognition and expression classification systems. The under lying principles of this spatial-frequency approach are examined with respect to images with planar scenes. Using the Continuous Wavelet Transform, full pe...
http://doras.dcu.ie/2370/
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Critical appraisal of product development expertise in Irish SMEs
(2009)
McDermott, Barry
Critical appraisal of product development expertise in Irish SMEs
(2009)
McDermott, Barry
Abstract:
The focus of this research was on the product development expertise of Irish SMEs. In particular, SMEs developing physical products (a physical product is defined as an electronic, medical device, plastic or general engineering product). A survey of Irish SMEs was conducted across industry sectors developing physical products with the objective of understanding how indigenous SMEs and therefore Ireland is progressing towards becoming a knowledge economy. SME characteristics (customers and markets, organisational structures, systems, processes and procedures, human and financial resources, culture and behaviour) were researched and used to understand the issues SMEs have with product development (PD research is mostly considered from the perspective of large companies). In relation to product development: strategy, innovation and learning, strategic techniques, organisational structure, product development process design, types of product development processes, tools and methodologie...
http://doras.dcu.ie/2377/
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Small firm large firm experiences in managing NPD projects
(2008)
Ledwith, Ann; Richardson, Ita; Sheehan, Anne
Small firm large firm experiences in managing NPD projects
(2008)
Ledwith, Ann; Richardson, Ita; Sheehan, Anne
Abstract:
Purpose: The purpose of this research paper is to present a modified framework for the waves of change of new product development of McGrath. Design/methodology/approach: A qualitative study of new product development (NPD) in four electronic firms (two small indigenous/two large multinational) was conducted. In-depth interviews were held with employees, including the founding entrepreneur in each of the small firms. Findings: Analysis of strategic, organisational and development factors shows that firms face different challenges during their NPD process, some related to size. Also, as firms grow, NPD learning may be lost. Research limitations/implications: The research findings are stated as a result of four cases studies, two in large firms and two in small firms. Further research will establish the generalisability of these findings. Practical implications: The electronics industry is renowned for its aggressive competitive environment where successful entrepreneurs continuously ...
http://hdl.handle.net/10344/51
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Analysis and design of high order digital phase locked loops
(2008)
Daniels, Brian
Analysis and design of high order digital phase locked loops
(2008)
Daniels, Brian
Abstract:
The Phase Locked Loop (PLL) is an important component of many electronic devices; it can be employed as a frequency synthesizer, for clock data recovery, and as amplitude and frequency demodulators. It is an inherently nonlinear closed loop feedback system; the nonlinearity is due mainly to the fact that the feedback loop comparator exhibits quantization-like effects at its output. The consequence of this nonlinearity is a lack of understanding of the behaviour of the PLL loop, particularly the behaviour and stability of high order PLL systems. This thesis presents a new design technique for high order Digital PLL (DPLL)systems with a charge pump phase frequency detector component, offering an alternative to the common design practice which is to analyze the DPLL using a linearised model of the analogue PLL. The linear model can only be justified for low order DPLL systems that are close to lock. This is due to the fact that as the DPLL systems loop order and complexity increases th...
http://eprints.nuim.ie/1492/
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Perceptual Centre correlates in Evoked Potentials
(2005)
Soraghan , C.; Ward, T.; Villing, R.; Timoney, J.
Perceptual Centre correlates in Evoked Potentials
(2005)
Soraghan , C.; Ward, T.; Villing, R.; Timoney, J.
Abstract:
Perceptual centres (p-centres) are the subjective moments of occurrence of acoustic stimuli. When sounds are perceived in synchrony or are regularly spaced, it is their p-centres which occur synchronously or are isochronous. In order to analyse or model the acoustic features which influence the p-centre, it is necessary to measure p-centres for many stimuli. However there is a problem: it is difficult for an external observer to determine the exact time at which a listener perceives a sound’s occurrence. A possible solution is to find a measurable electrophysiological correlate of the p-centre. In order to investigate this, an experiment is described which compares features of the Auditory Evoked Potential (AEP) response and p-centres for a number of speech and synthetic stimuli. The results indicate a correlation between the latency of the dominant negative peak of the AEP and the p-centre.
http://eprints.nuim.ie/1369/
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A Prototype Sourceless Kinematic-Feedback Based Video Game for Movement Based Exercise
(2006)
Foody, J.; Kelly, D.; Kumar, D.; Fitzgerald, D.; Ward, T.; Caulfield, B.; Markham, C.
A Prototype Sourceless Kinematic-Feedback Based Video Game for Movement Based Exercise
(2006)
Foody, J.; Kelly, D.; Kumar, D.; Fitzgerald, D.; Ward, T.; Caulfield, B.; Markham, C.
Abstract:
This paper presents a prototype kinematic and audio feedback based video game, availing of a scalable motion capture acquisition system, based around a number of orientation sensors. The orientation sensors used are USB based tri-axis magnetic and gravitational field transducers. The novel video-game is capable of incorporating the real time data from these sensors to control an on screen avatar, which in turn can be programmed to give appropriate instructions to the user i.e. play a sound file, once the user obtains a certain posture. The video game is designed to promote physical exercise and movement based relaxation, in particular; Yoga. In addition, design considerations; implementation and performance of the system are analyzed, discussed and the accuracy qualitatively analyzed by comparing movement data obtained from it to that of a validated motion analysis technique, the CODA motion analysis system.
http://eprints.nuim.ie/1352/
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A USB Interfaced Motion Capture Sensor, Using Tri-Axis Magnetic/Inertial Sensors For Use In Kinematic Studies
(2005)
Foody, J.; Mathews, F.; Kumar, D.; Markham, C.; Ward, T.; Caulfield, B.
A USB Interfaced Motion Capture Sensor, Using Tri-Axis Magnetic/Inertial Sensors For Use In Kinematic Studies
(2005)
Foody, J.; Mathews, F.; Kumar, D.; Markham, C.; Ward, T.; Caulfield, B.
Abstract:
An unobtrusive tri-axis magnetic and gravitational field transducer for use in kinematic tracking is presented. Outlined is a novel approach for using such a sensor i.e. providing a Universal Serial Bus (USB) interface, allowing the direct utilization of the logical topology of the standard, making scalable deployment possible. Furthermore design considerations; construction and performance of the sensor are analysed and discussed in detail.
http://eprints.nuim.ie/1299/
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MyVLE: A case study in building a universal telematic education environment for a small university
(2007)
Ward, Tomas; Monaghan, Karl; Villing, Rudi
MyVLE: A case study in building a universal telematic education environment for a small university
(2007)
Ward, Tomas; Monaghan, Karl; Villing, Rudi
Abstract:
Here we report on the design, building and testing of MyVLE, an internet-based e-learning system that provides a universal telematic education environment for educators. The system was designed from first principles with strong support for numerical disciplines integrated at the outset. From a pedagogical aspect the system is unrestricted in so far as possible to allow various theories of learning to be explored as different disciplines may demand. We consider it a universal system in that it supports broad-spectrum flexible learning from purely online to blended, without administrative overhead. Key features of the environment include interactive forums, comprehensive equation support, interactive testing, digital drop off boxes, integration with existing university computer systems, comprehensive marking management and user interaction statistics. The system was built extremely quickly and inexpensively through an agile software engineering process. The finished environment w...
http://eprints.nuim.ie/1267/
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A Java Tool for Exploring State Estimation using the Kalman Filter
(2004)
Delaney, Declan; Ward, Tomas
A Java Tool for Exploring State Estimation using the Kalman Filter
(2004)
Delaney, Declan; Ward, Tomas
Abstract:
This paper describes a novel software application that assists in understanding the process of estimating the state of a linear dynamic system based on noisy output signal measurements. An interactive Java tool, based on the Kalman Filter, is described. This consists of two main parts, a simple one-dimensional filter and a multi-dimensional filter tool. The user can set all input parameters through a single interface or by following a series of guided steps. Raw measurement data can be generated automatically or inserted manually by the user and the results of estimating the true system state are then presented as a series of graphs in real-time. The application is described through the use of two simple examples. Such an application could be used to teach signal and systems engineering.
http://eprints.nuim.ie/201/
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Simple Versatile Shearing Interferometer Suitable for Measurements on a Microscopic Scale
(2009)
Mihaylova, Emilia; Toal, Vincent
Simple Versatile Shearing Interferometer Suitable for Measurements on a Microscopic Scale
(2009)
Mihaylova, Emilia; Toal, Vincent
Abstract:
<p>Microelectromechanical systems (MEMS) behave differently from massive samples. Conventional testing and inspection techniques usually fail at the microscale. Recently there has been an increasing interest in the application of optical techniques for microstructure testing, because they are high-resolution, non-contact, full-field, fast and relatively inexpensive. New interferometric systems, which are suitable for microscopic optical metrology, are of interest for engineering and industrial applications. A modified electronic speckle pattern shearing interferometer (ESPSI) with a very simple shearing device has been designed for metrology applications on the microscale. The shearing device consists of two partially reflective glass plates. The reflection coefficients of the coatings are 0.3 and 0.7 respectively. The distance and the tilt between the two glass plates control the size of the shear. A long working distance microscope objective is attached to the CCD camera to...
http://arrow.dit.ie/cieoart/1
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A simple electronic speckle pattern interferometry system using holographic otical elements
(2005)
Reddy, Guntaka Tulasi Sridhar, (Thesis)
A simple electronic speckle pattern interferometry system using holographic otical elements
(2005)
Reddy, Guntaka Tulasi Sridhar, (Thesis)
Abstract:
<p>The aim of the work reported in this thesis is to develop a simple electronic speckle pattern interferometry (ESPI) system by combining holographic optical element technology with speckly interferometry. A holographic optical element is used in an ESPI system instead of the lenses, mirrors, beam splitters and beam combiners which are usually required in a conventional system. The final ESPI system consists only of a single holographic element, laser and CCD camera. Many currently available systems are complicated and consist of expensive optics that can be difficult to align. Even the simplest require several conventional optical elements to manipulate the laser light and provide the necessary object and reference beams. In this thesis holographic optical element technology is combined with speckle interferometry in order to make a simple, compact and low cost ESPI system. A compact ESPI system is built by incorporating a single holographic optical element, which generates ...
http://arrow.dit.ie/sciendoc/11
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Identifying key process characteristics and predicting etch rate from High-Dimension Datasets
(2009)
Ragnoli, E.; McLoone, S.; Lynn, S.; Ringwood, J.; Macgearailt, N.
Identifying key process characteristics and predicting etch rate from High-Dimension Datasets
(2009)
Ragnoli, E.; McLoone, S.; Lynn, S.; Ringwood, J.; Macgearailt, N.
Abstract:
In semiconductor manufacturing advanced process control (APC) refers to a range of techniques that can be used to improve process capability. As the dimensions of electronic devices have decreased, the application of APC has become more and more important for the critical stages of production processes. However, the economic disadvantage of employing APC is that it requires feedback information in the form of downstream metrology data, which is both time consuming and costly to obtain.
http://eprints.nuim.ie/1936/
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Calibration of non-conventional imaging systems
(2009)
Dunne, Aubrey K.
Calibration of non-conventional imaging systems
(2009)
Dunne, Aubrey K.
http://doras.dcu.ie/4620/
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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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Hardware implementation of a real-time 3D video acquisition system
(2010)
Andorko, Istvan; Corcoran, Peter M.
Hardware implementation of a real-time 3D video acquisition system
(2010)
Andorko, Istvan; Corcoran, Peter M.
Abstract:
An implementation of a real-time 3D video acquisition system on a single FPGA is presented. Our approach is based on the use of stereo image sensors and can display real-time 3D video when combined with shutter glasses. The 3D effect is generated based on the parallax of the stereo sensors. An overview of the system architecture is given, including some details of the FPGA implementation of actual image processing pipeline. This architecture provides the basis for a low-cost, personal 3D imaging appliance.
http://hdl.handle.net/10379/1437
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Instability in Self-Pulsation in Laser Diodes and its Effect on All-Optical Synchonization
(1994)
Hyland, Jonathan; Farrell, Gerald
Instability in Self-Pulsation in Laser Diodes and its Effect on All-Optical Synchonization
(1994)
Hyland, Jonathan; Farrell, Gerald
Abstract:
The effect of short- and long-term frequency instability in self pulsation on all-optical synchronization using a twin-section laser diode is experimentally investigated. Short-term frequency instability broadens the unlocked full width at half maximum (FWHM) of the fundamental of the rf spectrum of the self-pulsating laser diode. We show experimentally that the value of the unlocked FWHM, and thus the level of short-term instability, has a direct effect on the optical power required to maintain synchronization. A novel means of reducing the FWHM is presented based on a reflective transmission line stub connected to the absorber of the twin-section self-pulsating laser diode in use. A reduction of up to 5 dB in the average optical power required for effective synchronization is observed. Long-term frequency instability can prevent synchronization from taking place because of the limited lock-in frequency range of a self-pulsating laser diode. It is shown that for the devices used he...
http://arrow.dit.ie/engscheceart/54
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A Hybrid Fiber Optic Sensing System for Simultaneous Strain and Temperature Measurement and its Application
(2010)
Rajan, Ginu; Milenko, Karolina; Lesiak, Piotr; Semenova, Yuliya; Boczkowska, Anna; Rama...
A Hybrid Fiber Optic Sensing System for Simultaneous Strain and Temperature Measurement and its Application
(2010)
Rajan, Ginu; Milenko, Karolina; Lesiak, Piotr; Semenova, Yuliya; Boczkowska, Anna; Ramakrishnan, Manjusha; Jedrzejewski, Kazimierz; Domanski, Andrzej; Wolinski, Tomasz; Farrell, Gerald
Abstract:
A hybrid fiber optic sensor by integrating polarimetric fiber sensors and fiber Bragg grating sensors for simultaneous strain and temperature measurement is presented in this paper. Two types of polarimetric fiber sensors are used; a Panda fiber and a polarization maintaining photonic crystal fiber. The polarimetric strain sensors give the average strain and temperature information, while the fiber Bragg grating sensors give localized strain information. Two applications of the proposed configuration are also demonstrated in this paper. In the composite materials three fiber sensors are used while for other engineering applications a temperature insensitive polarimetric fiber sensor can be used together with an FBG sensor to measure strain and temperature simultaneously.
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