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Current Search:
All of 'Electronic' and 'Engineering' in all fields;
1480 items found
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Displaying Results 126 - 150 of 1480 on page 6 of 60
Marked
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An FPGA-based stereoscopic camera - electronic design tools and techniques
(2010)
Andorko, Istvan; Corcoran, Peter; Bigioi, Petronel
An FPGA-based stereoscopic camera - electronic design tools and techniques
(2010)
Andorko, Istvan; Corcoran, Peter; 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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Harnessing brain power at NUI Maynooth
(2005)
Ward, Tomas E.; McLoone, Sean F.; Coyle, S
Harnessing brain power at NUI Maynooth
(2005)
Ward, Tomas E.; McLoone, Sean F.; Coyle, S
Abstract:
The Department of Electronic Engineering at NUI Maynooth is involved in exciting interdisciplinary work in the biomedical, digital signal processing, control and electronic systems areas. Here Tomas Ward, Seán McLoone and Shirley Coyle highlight three specific projects.
http://mural.maynoothuniversity.ie/1433/
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Branch Prediction For Network Processors
(2010)
Bermingham, David
Branch Prediction For Network Processors
(2010)
Bermingham, David
Abstract:
Originally designed to favour flexibility over packet processing performance, the future of the programmable network processor is challenged by the need to meet both increasing line rate as well as providing additional processing capabilities. To meet these requirements, trends within networking research has tended to focus on techniques such as offloading computation intensive tasks to dedicated hardware logic or through increased parallelism. While parallelism retains flexibility, challenges such as load-balancing limit its scope. On the other hand, hardware offloading allows complex algorithms to be implemented at high speed but sacrifice flexibility. To this end, the work in this thesis is focused on a more fundamental aspect of a network processor, the data-plane processing engine. Performing both system modelling and analysis of packet processing functions; the goal of this thesis is to identify and extract salient information regarding the performance of multi-processor workl...
http://doras.dcu.ie/15731/
Marked
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Noise Suppression in OCDMA Networks using Nonlinear Optical Devices
(2010)
Dexter, Karl J.
Noise Suppression in OCDMA Networks using Nonlinear Optical Devices
(2010)
Dexter, Karl J.
Abstract:
Optical code division multiple access (OCDMA) is a multiplexing technique that has a number of inherent advantages that make it suitable for use in passive optical networks, such as allowing subscribers to transmit information in an asynchronous fashion over a single optical fibre. This form of multiplexing can provide a higher degree of flexibility and simplicity in comparison to other techniques. However, due to the asynchronous nature of transmission, OCDMA networks suffer from multiple access interference (MAI) and optical beat noise which severely impairs system performance. A number of solutions have been proposed to mitigate these noise sources. Increasing the optical code lengths used can reduce the level of optical beat noise, however this is generally at the expense of transmission speed and increased transmitter complexity. MAI suppression can be achieved through the use fibre-based nonlinear thresholders or optical time-gating. One problem with these solutions is the re...
http://doras.dcu.ie/15691/
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Radio over fibre distribution systems for ultra-wide band and millimetre wave applications
(2011)
Shams Eldin, Haymen
Radio over fibre distribution systems for ultra-wide band and millimetre wave applications
(2011)
Shams Eldin, Haymen
Abstract:
Short range wireless technology such as ultra-wideband (UWB) and 60 GHz millimetre wave (mm-wave) play a key role for wireless connectivity in indoor home, office environment or large enclosed public areas. UWB has been allocated at the frequency band 3.1-10.6 GHz with an emission power below -41.3 dBm. Mm-wave signals around 60 GHz have also attracted much attention to support high-speed data for short range wireless applications. The wide bandwidth and high allowable transmit power at 60 GHz enable multi-Gbps wireless transmission over typical indoor distances. Radio-over-fibre (RoF) systems are used to extend the propagation distance of both UWB and mm-wave signals over hundred of meters inside a building. UWB or mm-wave signals over fibre can be generated first at the central office before being distributed to the remote access points through optical fibre. In this work, we investigate two new techniques to generate and distribute UWB signals. These techniques are based on gene...
http://doras.dcu.ie/16295/
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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/
Marked
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Stresses and strain in silicon: 3-dimensional analytical capabilities for the non-invasive evaluation of strain fields in Si wafers and packaged chips
(2012)
Stopford, Jennifer
Stresses and strain in silicon: 3-dimensional analytical capabilities for the non-invasive evaluation of strain fields in Si wafers and packaged chips
(2012)
Stopford, Jennifer
Abstract:
IC manufacturing and chip embedding processes can induce stresses in Si, which have the potential to affect device functionality and reliability and ultimately lead to device failure. One of the challenges for the future of semiconductor manufacturing and chip packaging is the development of non-destructive metrology both at wafer level, and post-packaging. In this context this thesis proposes novel techniques for the in situ imaging of strain and internal damage in processed Si wafers and packaged Si chips. X-Ray Diffraction Imaging (XRDI) is a powerful, non-destructive technique for the imaging of strain in crystalline materials. Traditionally, section transmission topography geometry has been used to image the crystal volume and obtain direct information on the depth of defects present; however these images provide information on only a small volume of the crystal and can be difficult to interpret. In this thesis two novel 3-dimensional characterisation techniques ...
http://doras.dcu.ie/16686/
Marked
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An experimental assessment of computational fluid dynamics predictive accuracy for electronic component operational temperature
(2003)
Eveloy, Valérie C.
An experimental assessment of computational fluid dynamics predictive accuracy for electronic component operational temperature
(2003)
Eveloy, Valérie C.
Abstract:
Ever-rising Integrated Circuit (IC) power dissipation, combined with reducing product development cycles times, have placed increasing reliance on the use of Computational Fluid Dynamics (CFD) software for the thermal analysis of electronic equipment. In this study, predictive accuracy is assessed for board-mounted electronic component heat transfer using both a CFD code dedicated to the thermal analysis of electronics, Flotherm, and a general-purpose CFD code, Fluent. Using Flotherm, turbulent flow modelling approaches typically employed for the analysis of electronics cooling, namely algebraic mixing length and two-equation high-Reynolds number k-e models, are assessed. As shown, such models are not specific for the analysis of forced airflows over populated electronic boards, which are typically classified as low-Reynolds number flows. The potential for improved predictive accuracy is evaluated using candidate turbulent flow models more suited to such flows, namely a one-equatio...
http://doras.dcu.ie/17432/
Marked
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A framework for adaptive monitoring and performance management of component-based enterprise applications
(2004)
Mos, Adrian
A framework for adaptive monitoring and performance management of component-based enterprise applications
(2004)
Mos, Adrian
Abstract:
Most large-scale enterprise applications are currently built using component-based middleware platforms such as J2EE or .NET. Developers leverage enterprise services provided by such platforms to speed up development and increase the robustness of their applications. In addition, using a component-oriented development model brings benefits such as increased reusability and flexibility in integrating with third-party systems. In order to provide the required services, the application servers implementing the corresponding middleware specifications employ a complex run-time infrastructure that integrates with developer-written business logic. The resulting complexity of the execution environment in such systems makes it difficult for architects and developers to understand completely the implications of alternative design options over the resulting performance of the running system. They often make incorrect assumptions about the behaviour of the middleware, which may lead to design ...
http://doras.dcu.ie/18093/
Marked
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Block-level test scheduling under power dissipation constraints
(2002)
Muresan, Valentin
Block-level test scheduling under power dissipation constraints
(2002)
Muresan, Valentin
Abstract:
As dcvicc technologies such as VLSI and Multichip Module (MCM) become mature, and larger and denser memory ICs arc implemented for high-performancc digital systems, power dissipation becomes a critical factor and can no longer be ignored cither in normal operation of the system or under test conditions. One of the major considerations in test scheduling is the fact that heat dissipated during test application is significantly higher than during normal operation (sometimes 100 - 200% higher). Therefore, this is one of the recent major considerations in test scheduling. Test scheduling is strongly related to test concurrency. Test concurrency is a design property which strongly impacts testability and power dissipation. To satisfy high fault coverage goals with reduced test application time under certain power dissipation constraints, the testing of all components on the system should be performed m parallel to the greatest extent possible. Some theoretical analysis of this problem h...
http://doras.dcu.ie/18102/
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A survey of Irish electronic industries towards development of a low cost MRP system to enhance the effectiveness of their inventory control
(1991)
Grace, Patricia
A survey of Irish electronic industries towards development of a low cost MRP system to enhance the effectiveness of their inventory control
(1991)
Grace, Patricia
Abstract:
This thesis is predominantly concerned with the study of inventory control practices within the electronics industry in Ireland. The study o f the inventory control system has been carried out under three main interrelated sections: Industrial Survey Development of an MRP Model Development of a Material Flow Simulation Model. First, an industrial survey carried out to identify the common problems and challanges related to the electronics industry sector with respect to their inventory control systems. The results o f the industrial survey representing 44 companies are presented. The survey classifies the Irish Electronics industry sector in terms of company size, product structure and MRP levels. Second, based on the industrial survey results a low cost MRP model has been developed to enhance the effectiveness of their inventory control system. The model has been solved for a variety of product structures using standard mathematical programming packages. The results obtained are...
http://doras.dcu.ie/18783/
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Joint estimation of vocal tract and source parameters of a speech production model
(1993)
Jeevakumar, Kanagaratnam
Joint estimation of vocal tract and source parameters of a speech production model
(1993)
Jeevakumar, Kanagaratnam
Abstract:
This thesis describes algorithms developed to jointly estimate vocal tract shapes and source signals from real speech. The methodology was developed and evaluated using simple articulatory models of the vocal tract, coupled with lumped parametric models of the loss mechanisms in the tract. The vocal tract is modelled by a five parameter area function model [Lm, 1990] Energy losses due to wall vibration and glottal resistance are modelled as a pole- zero filter placed at the glottis. A model described in [Lame, 1982] is used to approximate the lip radiation characteristic. An articulatory-to-acoustic "linked codebook" of approximately 1600 shapes is generated and exhaustively searched to estimate the vocal tract parameters. Glottal waveforms (input signals) are obtained by inverse filtering real speech using the estimated vocal tract parameters. The inverse filter is constructed using the estimated area function. A new method is proposed to fit the Liljencrants - Fant gl...
http://doras.dcu.ie/18893/
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Growth and characterization of BN thin films deposited by PACVD
(1993)
Karim, M. D. Ziaul
Growth and characterization of BN thin films deposited by PACVD
(1993)
Karim, M. D. Ziaul
Abstract:
Boron nitride has become the focus of a considerable amount of interest because of its properties which relate closely to those of carbon. In particular, the cubic boron nitride phase has extreme hardness, chemical inertness, high resistivity, thermal conductivity and transparency and resistance to oxidation up to 1600°C. The conventional methods of synthesis use highly toxic and inflammable source materials at high deposition temperature. A hot filament activated PACVD technique was developed to deposit BN films under a wide range of conditions. The source material was borane-ammonia (BH3-NH3) which is a non-toxic crystalline solid, free of carbon and oxygen. Using this technique, mixed-phase boron nitride (BN) films, containing crystallites of the cubic phase embedded in a hexagonal matrix, were deposited at a substrate temperature of 350°C. These films showed good thermal and chemical stability with smooth surface topography. A good correlation was obtained between the properti...
http://doras.dcu.ie/18906/
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Robust-optimal control of a servo motor
(1994)
Kettle, Paul J
Robust-optimal control of a servo motor
(1994)
Kettle, Paul J
Abstract:
This work develops a frequency domain loop shaping design strategy based on linear quadratic gaussian controllers with loop transfer recovery (LQG/LTR). The design strategy presented is an integrated design synthesis procedure which is conducive to educated trade-off management. The controller design specification are expressed in terms of loop shaping bounds for load dynamic and model uncertainties, command response times and disturbance response times. The design philosophy is to first and foremost satisfy the stability constraints subject to the model variation specification and then to satisfy the time domain design specifications. The LQG/LTR controller is synthesised in discrete time, the resulting design is a Robust-Optimal design. Asymptotic disturbance rejection is achieved by using a disturbance estimate feedforward technique. Within the servo control industry two position feedback sensors are commonly used, namely the resolver and the optical encoder. In this work the co...
http://doras.dcu.ie/18935/
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Orthogonal frequency division multiplexing for next generation optical networks
(2013)
Browning, Colm
Orthogonal frequency division multiplexing for next generation optical networks
(2013)
Browning, Colm
Abstract:
Next generation optical networks will be required to provide increased data throughput on a greater number of optical channels and will also have to facilitate network flexibility in order to adapt to dynamic traffic patterns. Furthermore, the potentially wide deployment of optical Access and Metropolitan networks in particular require that these challenges are met in a cost effect manner. This thesis examines the use of Orthogonal Frequency Division Multiplexing (OFDM) as a means of helping to meet these requirements for next generation optical systems with a high market volume. OFDM is a multi–carrier modulation technique which exhibits high spectral efficiency and a tolerance to chromatic dispersion making it an excellent candidate for use in next generation optical networks. The work presented in this thesis shows how the use of OFDM in conjunction with novel laser devices and direct detection can be used to construct cost effective, low footprint optical systems. These systems ...
http://doras.dcu.ie/19482/
Marked
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X-ray diffraction techniques for future advanced CMOS metrology challenges
(2013)
Wong, Chiu Soon
X-ray diffraction techniques for future advanced CMOS metrology challenges
(2013)
Wong, Chiu Soon
Abstract:
Traditional Si CMOS scaling following Moore’s Law is becoming increasingly difficult as physical limits are approached at sub-20 nm nodes and beyond. A significant issue is the limited charge carrier mobility in Si, and so new channel materials that carry relatively higher mobility carriers have been used, such as strained Si. Other materials such as III-V and germanium (Ge) are currently under consideration for replacing the conventional Si channel for future generations of low power and high speed electronics. However, challenges still remain with the realisation of high quality III-V material on Si for CMOS devices fabrication because the tolerance to dislocations is very low (<105 cm-2). In order to overcome this problem, a non-destructive X-ray characterisation routine which can be used to effectively help III-V growers identify various issues associated with heteroepitaxial growth of III-V materials and which delivers useful experimental feedback to growers for material qua...
http://doras.dcu.ie/18833/
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Using atmospheric pressure tendency to optimise battery charging in o-grid hybrid wind-diesel systems for telecoms
(2014)
Phelan, Shane
Using atmospheric pressure tendency to optimise battery charging in o-grid hybrid wind-diesel systems for telecoms
(2014)
Phelan, Shane
Abstract:
Off grid telecom base stations in developing nations are powered by diesel generators. They are typically oversized and run at a fraction of their rated load for most of their lifetime. Operating these generators at partial load is inefficient and over time physically damages the engine. A hybrid configuration,which is the combination of multiple energy sources, uses a battery bank which powers the telecoms load for a portion of the time. The generator only operates when the battery bank needs to be charged. Adding a wind turbine further reduces the generator run hours and saves fuel. The generator is oblivious to the current wind conditions which lead to simultaneous generator-wind power production. As the batteries become charged by the generator, the wind turbine controller is forced to dump surplus power as heat through a resistive load. This dissertation details how the relationship between barometric pressure and wind speed can be used to add an additional layer of sophisticat...
http://doras.dcu.ie/19764/
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Formally counting electronic votes (but still only trusting paper)
(2007)
Kiniry, Joseph R.
Formally counting electronic votes (but still only trusting paper)
(2007)
Kiniry, Joseph R.
Abstract:
In this extended abstract we summarize our consulting work, scientific research, and activism in the topic of electronic (computer-based) voting. The Dutch and Irish government’s activities are our particular focus, as is the Kiezen op Afstand (KOA) system, an experimental platform for electronic voting research with formal methods. We also reflect on the current state of affairs in The Netherlands and Ireland, and discuss next research steps in trustworthy, verified electronic voting systems.
http://hdl.handle.net/10344/2128
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Hardware acceleration of network intrusion detection and prevention
(2014)
Cronin, Brendan
Hardware acceleration of network intrusion detection and prevention
(2014)
Cronin, Brendan
Abstract:
Network Intrusion Detection and Prevention Systems (NIDPS) are important elements of network security. Their role is to monitor internet traffic for malicious content and, on detection, generate an alert message and/or block the offending traffic. Potential attacks are described in a database of rules known as the rule set, where each rule consists of an IP header part and a payload signature part. The payload signature can be in the form of a fixed string and/or regular expression. This thesis studies the three main stages of these systems, namely TCP/IP reassembly, multi-match header matching and Deep Packet Inspection (DPI). TCP/IP reassembly is a necessary prerequisite to DPI as attack patterns may span more than one IP fragment or TCP segment. Either target-based reassembly or traffic normalisation is required in order to overcome insertion/evasion attacks. This thesis builds upon existing research by outlining an FPGA-based architecture that handles the common case of reassemb...
http://doras.dcu.ie/19992/
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Spectrally efficient modulation formats for fast reconfigurable optical networks
(2014)
Huynh, Tam
Spectrally efficient modulation formats for fast reconfigurable optical networks
(2014)
Huynh, Tam
Abstract:
The desire for multi-media content and richly interactive data services is shaping a new era for telecommunications networks. Future networks will need to be capable of offering Triple Play, IPTV, Video-on-Demand, Voice-over-IP and High-Speed Internet Access, combined with guaranteed Quality of Service. These networks will employ optical transport networks with wavelength division multiplexing (WDM) technology, and advanced modulation formats, in order to achieve the high capacities required. In addition, given the bursty nature of this data it is expected that dynamic allocation of the bandwidth will be implemented to efficiently use the available capacity. The key component in these networks will be the tuneable laser transmitters that generate the different wavelength packets. This thesis has explored novel applications and implementations of the sample-grating distributed Bragg reflector (SG-DBR) lasers, in optical WDM networks. Through theory, simulations and experiments, the u...
http://doras.dcu.ie/19977/
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An efficient scalable time-frequency method for tracking energy usage of domestic appliances using a two-step classification algorithm
(2015)
Meehan, Paula
An efficient scalable time-frequency method for tracking energy usage of domestic appliances using a two-step classification algorithm
(2015)
Meehan, Paula
Abstract:
Load identification is the practice of measuring electrical signals in a domestic environment in order to identify which electrical appliances are consuming power. One reason for developing a load identification system is to reduce power consumption by increasing consumers’ awareness of which appliances consume most energy. The thesis outlines the development of a load disaggregation method that measures the aggregate electrical signals of a domestic environment and extracts features to identify each power consuming appliance. A single sensor is deployed at the main incoming power point, to sample the aggregate current signal. The method senses when an appliance switches ON or OFF and uses a two-step classification algorithm to identify which appliance has caused the event. Parameters from the current in the temporal and frequency domains are used as features to de- fine each appliance. These parameters are the steady state current harmonics and the rate of change of the transient s...
http://doras.dcu.ie/20814/
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Non-Locally Regularised Optic-Flow Approaches and Model and Motion-based Dense Cell Population Tracking
(2015)
Yu, Sha
Non-Locally Regularised Optic-Flow Approaches and Model and Motion-based Dense Cell Population Tracking
(2015)
Yu, Sha
Abstract:
The first half part of this thesis concerns optic-flow (OF) based motion estimation. Recent advances in OF regularisation approaches have emphasised the three important aspects, exploring new motion-integration strategies, looking for improvements or replacements of existing motion spaces, and investigating more suitable motion-distribution priors (MDPs) that can better fit or describe the statistics of a particular motion space. Motivated by that, two motion regularisation approaches, making up the first core contribution of this thesis, have been proposed. First, an oriented geodesic distance based non-local regularisation approach. At the heart of this approach is a novel pairwise feature-affinity measurement. The new non-local OF approach has been demonstrated particular useful in dealing with two situations: accurately recovering object boundary motion and estimating motion for nearby similar-appearance objects. Experimental results, comparing to leading-edge non-local regulari...
http://doras.dcu.ie/20838/
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Accelerated iterative solvers for the solution of electromagnetic scattering and wave propagation propagation problems
(2016)
Pham-Xuan, Vinh
Accelerated iterative solvers for the solution of electromagnetic scattering and wave propagation propagation problems
(2016)
Pham-Xuan, Vinh
Abstract:
The aim of this work is to contribute to the development of accelerated iterative methods for the solution of electromagnetic scattering and wave propagation problems. In spite of recent advances in computer science, there are great demands for efficient and accurate techniques for the analysis of electromagnetic problems. This is due to the increase of the electrical size of electromagnetic problems and a large amount of design and analytical work dependent on simulation tools. This dissertation concentrates on the use of iterative techniques, which are expedited by appropriate acceleration methods, to accurately solve electromagnetic problems. There are four main contributions attributed to this dissertation. The first two contributions focus on the development of stationary iterative methods while the other two focus on the use of Krylov iterative methods. The contributions are summarised as follows: • The modified multilevel fast multipole method is proposed to accelerate the p...
http://doras.dcu.ie/20951/
Marked
Mark
Optical multicarrier sources for spectrally efficient optical networks
(2016)
Vujicic, Vidak
Optical multicarrier sources for spectrally efficient optical networks
(2016)
Vujicic, Vidak
Abstract:
During the last 30 years the capacity of commercial optical systems exceeded the network traffic requirements, mainly due to the extraordinary scalability of wavelength division multiplexing technology that has been successfully used to expand capacity in optical systems and meet increasing bandwidth requirements since the early 1990’s. Nevertheless, the rapid growth of network traffic inverted this situation and current trends show faster growing network traffic than system capacity. To enable further and faster growth of optical communication network capacity, several breakthroughs occurred during the last decade. First, optical coherent communications, which were the subject of intensive research in the 1980’s, were revived. This triggered the employment of advanced modulation formats. Afterwards, with the introduction of orthogonal frequency division multiplexing (OFDM) and Nyquist WDM modulation techniques in optical communication systems, very efficient utilisation of the avai...
http://doras.dcu.ie/20981/
Marked
Mark
Integrated distribution of wireless and wired services using a passive optical fibre network
(2016)
Saljoghei, Arsalan
Integrated distribution of wireless and wired services using a passive optical fibre network
(2016)
Saljoghei, Arsalan
Abstract:
The desire for high bandwidth multi-media reach content and the exponential growth of Internet traffic has led to the penetration of optical technologies into the access segment in the form of Fibre-To-The-x (FFT-x) topologies. Due to its cost effectiveness and low energy consumption, most FFT-x models have been based on Passive Optical Networks (PONs) where the employment of in-line active components has been discouraged. Next generation optical access networks are required to provide higher bandwidth-distance product and support wireless services in a cost effective manner. Through experimental and simulation work, this thesis examines the use of multicarrier modulation formats such as Orthogonal Frequency Division multiplexing (OFDM) and Filter Bank Multi Carrier (FBMC) as mans of helping to meet the bandwidth-distance requirements set for next generation optical access networks. OFDM and FBMC both exhibit high spectral efficiency and a tolerance to chromatic dispersion making t...
http://doras.dcu.ie/21226/
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