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Current Search:
All of 'Electronic' and 'Engineering' in all fields;
1480 items found
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Displaying Results 226 - 250 of 1480 on page 10 of 60
Marked
Mark
Development of EMC antennas and their application in on-line SE measurement of conductive composite plastic materials
(1994)
Rahman, Hafizur
Development of EMC antennas and their application in on-line SE measurement of conductive composite plastic materials
(1994)
Rahman, Hafizur
Abstract:
The development of three new EMC antennas, namely the V-conical-lens antenna (VCLA), half of a Transverse Electromagnetic-T (TEM-T) cell (acting as an antenna) and the Q-loop antenna (a quarter of a loop antenna in front of 90 ° comer reflector) is described. These antennas, when calibrated, are designed with a view to employing them in the measurement of on-line Shielding Effectiveness (SE) of conductive composite materials. Test devices incorporating those newly developed antennas for measuring SE against high impedance and low impedance wave are introduced. The theoretical model of the VCLA is developed and design features are presented as a state-of-the-art project with a view to developing this technique in the near future for measuring the plane wave SE of conductive plastics during their production process. A modified TEM-T cell designed to simulate a high impedance field on the material under test (MUT) in its (TEM-T cell's) near field region is presented. The field s...
http://doras.dcu.ie/19293/
Marked
Mark
Electroluminescent displays by sol-gel process
(1994)
Tang, Wenhui
Electroluminescent displays by sol-gel process
(1994)
Tang, Wenhui
Abstract:
Thin film electroluminescent displays are attractive commercially as well as scientifically and of technological interest in the design of large area, flat screen displays. The interest in developing reliable luminescent materials for applications on flat panel displays has produced a considerable research effort in this area. This effort has been directed to the techniques of film deposition as well as to the different types of materials and dopants used as active components on electroluminescent devices. Applications of ZnS and ZnS:Mn films in electroluminescent displays have been increasing examined. Mn-doped ZnS is one of the most studied materials for luminescent devices. Zinc sulphide is a semiconductor suitable to be used as host matrix for a large variety of dopants because of its wide energy band gap. The sol-gel process is now well accepted as a technology for preparing thin films. The advantages of the sol-gel process are that it is simple and inexpensive and has the gene...
http://doras.dcu.ie/19437/
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Resource allocation in ATM networks
(1996)
Murphy, John
Resource allocation in ATM networks
(1996)
Murphy, John
Abstract:
The areas of resource allocation ancl congestion control in ATM networks have been investigated. ATM networks and the guarantees given to users have been reviewed and a new model of ATM networking has been proposed. To aid the analysis of ATM network issues, performance modelling and simulation methods have been reviewed. Typical sources have been designed : a two-state Markov model for voice ; a multi-state Markov one layer variable bit rate video source model ; an empirical file transfer data source model ; and some basic network elements. The models have been verified and validated on a discrete event simulator. It was shown that there are problems when using ATM over satellite links. A model for the noise analysed from real satellite links was developed. Based on this model a new more efficient protocol for assembling ATM cells was proposed and simulated. Again at the cell level, the traffic that can pass the standardised conformance test and still produce the worst performance...
http://doras.dcu.ie/19516/
Marked
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Time series forecasting methodologies for electricity supply systems
(1996)
Murray, Fiona
Time series forecasting methodologies for electricity supply systems
(1996)
Murray, Fiona
Abstract:
Forecasting is an essential function in the electricity supply industry. Electricity demand forecasting is performed on number of different time-scales depending on the function for which they are required. In the short term (hourly) forecasts of electricity demand are required for the safe and efficient operation of the power system. Medium term forecasts (weekly) are needed for economic planning and long term (yearly) forecasts are required for deciding on system generation and transmission expansion plans. In recent years the electricity supply industry in some countries has undergone significant changes mainly due to a levelling off in the growth of electricity demand and also due to technological advances. There has been a move toward the existence of a number of smaller generating companies and the emergence of a competitors market has resulted. These changes in the structure of the industry have led to new requirements in the area of forecasting, where forecasts are now requi...
http://doras.dcu.ie/19517/
Marked
Mark
Modelling, simulation and multivariable control of plasma etching of silicon and silicon dioxide
(1994)
Tan, Liang
Modelling, simulation and multivariable control of plasma etching of silicon and silicon dioxide
(1994)
Tan, Liang
Abstract:
Plasma etching has been used extensively in the microelectronics industry for integrated circuit fabrication. However, the optimisation of this process is quite challenging because the plasma etching process is complex and not fully understood. An experimental and theoretical study of the etching characteristics of silicon (Si) and silicon dioxide (SiC^) in a sulphur hexafluoride (SFg) with Argon is reported. The selected manipulated variables or inputs are radio-frequency (RF) discharge power density, chamber pressure and gas component ratios. The semi-outputs or process variables are the relative percent concentration of plasma species: fluorine [F], [SFX] (x=3-»6) and the electric field to pressure ratio E/p. The outputs or performance variables are Si and Si02 etch rates and (centre-to-edge ) etching uniformity. The etch rates of silicon and silicon dioxide in SFg/Ar plasma are statistically investigated based on the effects of different settings of the manipulated variables. O...
http://doras.dcu.ie/19597/
Marked
Mark
Remote access computed tomography colonography
(2013)
Min, Qiusha
Remote access computed tomography colonography
(2013)
Min, Qiusha
Abstract:
This thesis presents a novel framework for remote access Computed Tomography Colonography (CTC). The proposed framework consists of several integrated components: medical image data delivery, 2D image processing, 3D visualisation, and feedback provision. Medical image data sets are notoriously large and preserving the integrity of the patient data is essential. This makes real-time delivery and visualisation a key challenge. The main contribution of this work is the development of an efficient, lossless compression scheme to minimise the size of the data to be transmitted, thereby alleviating transmission time delays. The scheme utilises prior knowledge of anatomical information to divide the data into specific regions. An optimised compression method for each anatomical region is then applied. An evaluation of this compression technique shows that the proposed ‘divide and conquer’ approach significantly improves upon the level of compression achieved using more traditional global c...
http://doras.dcu.ie/19199/
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Analysis of silicon wafer damage due to nanoindentation by microraman spectroscopy and white beam synchrotron X-ray toporaphy
(2014)
Allen, David
Analysis of silicon wafer damage due to nanoindentation by microraman spectroscopy and white beam synchrotron X-ray toporaphy
(2014)
Allen, David
Abstract:
In the semiconductor industry, wafer handling introduces micro-cracks at the wafer edge and the causal relationship of these cracks to wafer breakage is a difficult task. By way of understanding the wafer breakage process, a series of nano-indents were introduced to both 20 x 20mm (100) wafer pieces and into whole 200mm wafers as a means of introducing controlled strain. The indents were introduced to the silicon by way of a Berkovich tip with applied forces of 100mN to 600mN and with a Vickers tip with applied forces of 2N to 50N. The samples were subjected to an array of both in situ and ex situ anneal in order to simulate a production environment. The samples were analysed using both micro-Raman spectroscopy and white beam x-ray topography to study the strain fields produced by the nano-indentation and the effect of annealing on the strain fields which was then compared to FEM models of the indents. A novel process for the creation of three dimensional x-ray images, 3D-XRDI, was ...
http://doras.dcu.ie/19734/
Marked
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All-optical processing for terabit/s wavelength division multiplexed systems using two-photon absorption in a semiconductor micro-cavity
(2009)
Bondarczuk, Krzysztof
All-optical processing for terabit/s wavelength division multiplexed systems using two-photon absorption in a semiconductor micro-cavity
(2009)
Bondarczuk, Krzysztof
Abstract:
Due to continued growth of the Internet and the introduction of new broadband services, such as video-on-demand and mobile telephony, there is a constant requirement for higher speed communications. It is expected that next generation optical communications systems will evolve towards higher capacities by increasing individual line rates rather than the number of wavelength channels. To implement these high-speed optical networks operating at individual channel rates above 100 Gb/s, all-optical processing techniques are necessary. A novel approach based on two photon absorption nonlinearity within a resonance cavity enhanced structure is explored within this thesis. High-speed transmission is severely limited by optical impairments requiring frequent and expensive signal regeneration. Chromatic dispersion, considered as one of the main limiting factors, has to be mitigated in order to achieve satisfactory system performance. Continuous monitoring and adaptive compensation of accumul...
http://doras.dcu.ie/3621/
Marked
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Case study of an interdisciplinary problem-based engineering design course
(2008)
TORRANCE, ARCHIBALD ANDREW; WEST, ROGER PLUMER; O'KELLY, BRENDAN; BURKE, MARTIN J;...
Case study of an interdisciplinary problem-based engineering design course
(2008)
TORRANCE, ARCHIBALD ANDREW; WEST, ROGER PLUMER; O'KELLY, BRENDAN; BURKE, MARTIN J; BOLAND, FRANCIS MORGAN
Abstract:
This paper describes an interdisciplinary problem-based engineering design course taken by about 170 students in the second year of the Bachelor of Engineering degree program at Trinity College Dublin. The course runs throughout the academic year and consists of three projects, namely: the design and construction of a model railcar to safely carry freight in as short a time period as possible along a racecourse (mechanical); a bridge to support the rail track (civil) and a signaling system to control the movement of the railcar (electronic). Working groups of mixed ability are given written project specifications, timelines and submission deadlines. The projects, which have a plurality of solutions, serve as an engine for invention to assist the students in achieving a range of professional, transferable and social competences under the guidance of a team of professors and demonstrators. The motivation among the students is high and considerable enthusiasm and interaction is generat...
http://hdl.handle.net/2262/65746
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Simulation of nonlinear systems subject to modulated chirp signals
(2015)
Condon, Marissa; Iserles, Arieh
Simulation of nonlinear systems subject to modulated chirp signals
(2015)
Condon, Marissa; Iserles, Arieh
Abstract:
Purpose The purpose of the paper is to apply a novel technique for the simulation of nonlinear systems subject to modulated chirp signals. Design/methodology/approach The simulation technique is first described and its salient features are presented. Two examples are given to confirm the merits of the method. Findings The results indicate that the method is appropriate for simulating nonlinear systems subject to modulated chirp signals. In particular, the efficiency and accuracy of the method is seen to improve as the chirp frequency increases. In addition, error bounds are given for the method. Originality/value Chirp signals are employed in several important applications such as representing biological signals and in spread spectrum communications. Analysis of systems involving such signals requires accurate, appropriate and effective simulation techniques.
http://doras.dcu.ie/20733/
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VANET-enabled eco-friendly road characteristics-aware routing for vehicular traffic
(2015)
Doolan, Ronan
VANET-enabled eco-friendly road characteristics-aware routing for vehicular traffic
(2015)
Doolan, Ronan
Abstract:
There is growing awareness of the dangers of climate change caused by greenhouse gases. In the coming decades this could result in numerous disasters such as heat-waves, flooding and crop failures. A major contributor to the total amount of greenhouse gas emissions is the transport sector, particularly private vehicles. Traffic congestion involving private vehicles also causes a lot of wasted time and stress to commuters. At the same time new wireless technologies such as Vehicular Ad-Hoc Networks (VANETs) are being developed which could allow vehicles to communicate with each other. These could enable a number of innovative schemes to reduce traffic congestion and greenhouse gas emissions. 1) EcoTrec is a VANET-based system which allows vehicles to exchange messages regarding traffic congestion and road conditions, such as roughness and gradient. Each vehicle uses the messages it has received to build a model of nearby roads and the traffic on them. The EcoTrec Algorithm then recom...
http://doras.dcu.ie/20661/
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Process diagnostics of industrial plasma systems
(2015)
Mac Gearailt, Niall
Process diagnostics of industrial plasma systems
(2015)
Mac Gearailt, Niall
Abstract:
This thesis presents new techniques to investigate and understand the source of process variability in plasma etching. In a semiconductor factory thousands of wafers are processed every month in multiple chambers. Whi le great effort is made to create reproducible process conditions, common and special cause variation remain a big challenge for the semiconductor industry. Process conditions are never identical from wafer to wafer and chamber to chamber. When high-frequency RF power, employed to create a plasma, is coupled into a chamber, the electrical characteristics of each chamber assembly is different. This electrical difference is as a result of mechanical differences of chamber components and how they are assembled. RF losses of the current affect the power deposition in the plasma and affect the process outcome. As each chamber processes more and more wafers, by-products buildup on the chamber walls impacting the process repeatability and influencing the processing chemistry....
http://doras.dcu.ie/20813/
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Mark
A multi-modal smart sensing network for marine environmental monitoring
(2015)
Zhang, Dian
A multi-modal smart sensing network for marine environmental monitoring
(2015)
Zhang, Dian
Abstract:
There is an imperative need for long-term, large-scale marine monitoring systems that will allow decisions to be made based on the analysis of collected data to avoid or limit negative impacts on the ecosystem. Modern marine environmental sensing technologies, such as autonomous wireless sensor networks (WSNs), provide the capability to meet the challenges of high spatial and temporal scales. However, the significant amount of data generated from WSNs is a significant challenge for manual analysis. These multitudinous data need to be automatically processed, indexed and catalogued in a smarter way that can be more easily understood, accessed and managed by operators, scientists and policy makers. Moreover, current research works show that WSNs have their own limitations, for example, reliability issues and the fact that they are passive systems and provide context-less data. Thus, it is becoming increasingly clear that in order to adequately monitor marine environments, they need to...
http://doras.dcu.ie/20802/
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Mark
High-capacity multicarrier electro-optical transceivers based on analogue signal processing
(2016)
Gutierrez, Fernando
High-capacity multicarrier electro-optical transceivers based on analogue signal processing
(2016)
Gutierrez, Fernando
Abstract:
Currently, the proliferation of services and applications based on the cloud and the Internet are translating into increasing demand for capacity in data networks. Optical Communications is the only technical field that can address this issue by providing higher performance electro-optical transceivers with enhanced spectral efficiency, power consumption and latency. Many research and implementation efforts are focusing on multicarrier solutions, often referred to as subcarrier multiplexing (SCM), as they are more tolerant to dispersion and allow a higher modulation order per subchannel. In recent years, the most widespread trend has developed SCM subsystems based on digital signal processing (DSP). They can achieve high spectral efficiencies with complicated algorithms, but also present an important drawback: intensive DSP brings about unwanted high-power consumption and high latency. An alternative consists of developing SCM systems based on analogue signal processing (ASP) as it...
http://doras.dcu.ie/21381/
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Investigating multi-modal features in the design of a multi-media hyperlinking framework
(2016)
Chen, Shu
Investigating multi-modal features in the design of a multi-media hyperlinking framework
(2016)
Chen, Shu
Abstract:
Search, as a well-known information retrieval strategy, is widely researched and developed for academic and commercial usage. However, in the context of increasing amounts of multimedia data, search alone cannot satisfy user requirements for exploring multimedia resources. Therefore, preprocessing of multimedia resources is necessary to define potentially related documents to reduce retrieval time and improve the browsing efficiency. Using hyperlinks to connect relevant resources is widely used for multimedia collection. However, the definition of hyperlinks is usually based on textual information. For example, hyperlinks in Wikipedia link a term to relevant webpages. By contrast, content based multimedia retrieval provides the possibility of analysing multimedia materials on the actual content. The availability of these technologies for multimedia search suggests further investigation of content-based hyperlinking for multimedia collections. This thesis is dedicated to a novel to...
http://doras.dcu.ie/21321/
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Fabrication, characterisation and analysis of ceria thin films and patterned nanostructered deposits for enhanced solar-driven thermochemical conversion
(2016)
Asmaa, Eltayeb
Fabrication, characterisation and analysis of ceria thin films and patterned nanostructered deposits for enhanced solar-driven thermochemical conversion
(2016)
Asmaa, Eltayeb
Abstract:
Ceria-based solar-driven thermochemical conversion is a promising solution for efficient and sustainable hydrogen production. This is mainly due to the oxygen storage capacity (OSC) property of ceria (CeO2), which results from the fact that CeO2 can oxidise and reduce molecules. Oxygen vacancy defects can be rapidly formed and eliminated, giving CeO2 its high OSC. The ability to combine this unique material property with improvements in optical absorption, through the use of a novel light management structure geometry based on low-quality factor whispering-gallery resonant modes inside a spherical nanoshell structure, is a matter of great interest. The growth of spherical ceria nanoshells will support whispering-gallery resonant modes with enhanced light absorption, enabling an efficient solar thermal-driven process, while the nanostructure morphology will also lead to enhanced redox activity due to the large surface to volume ratio. These features will both lead to efficient solar-...
http://doras.dcu.ie/21483/
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Design and evaluation of an energy efficient frequency adaptive router
(2017)
Guo, Feng
Design and evaluation of an energy efficient frequency adaptive router
(2017)
Guo, Feng
Abstract:
Energy efficiency is becoming a prominent issue in ICT networks. Many approaches have been proposed to reduce the power consumption of ICT network devices. Among those green approaches, dynamic frequency scaling (DFS) offers an elegant solution for improving the energy efficiency of processors. To evaluate the impact of different DFS techniques on energy efficiency of real network devices, this work designs a prototype of a novel energy-aware Frequency Adaptive Router (FAR) that dynamically scales the operating frequency of core logic FPGA processor among five different processing capacities in response to traffic load, rather than leaving the network devices running on its maximum processing capacity all the time. Three dynamic frequency adaptation control policies are introduced into the FAR to balance the trade-off between performance and power consumption. Based on statistics monitoring and preset thresholds, the proposed dynamic frequency adaptation control policies can manage...
http://doras.dcu.ie/21891/
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Energy-aware adaptive solutions for multimedia delivery to wireless devices
(2017)
Kennedy, Martin
Energy-aware adaptive solutions for multimedia delivery to wireless devices
(2017)
Kennedy, Martin
http://doras.dcu.ie/21977/
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Improving user experience and energy efficiency for different classes of users in vehicular networks
(2016)
Tal, Irina
Improving user experience and energy efficiency for different classes of users in vehicular networks
(2016)
Tal, Irina
Abstract:
Lately, significant research efforts are put in the area of designing smart cities by both academia and industry focusing on making use of city facilities (buildings, infrastructure, transportation, energy, etc.) in order to improve people’s quality of life and create a sustainable environment. Vehicular ad hoc networks (VANET) play a main role in supporting the creation of smarter cities. VANET are based on “smart” inter-vehicle communications and with the infrastructure via so called V2X communications (i.e. V2V – vehicle-to-vehicle and V2I/I2V – vehicle-to-infrastructure/infrastructure-to-vehicle). V2X communications demonstrated their huge potential when designing not only intelligent transportation solutions, but also green transportation solutions. Most of the research in this area targets a single class of VANET users represented by the car drivers. This thesis addresses different types of users, mainly the cyclists, as cycling is one of the most sustainable and green forms o...
http://doras.dcu.ie/21016/
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Plasma-based surface Nanopatterning of semiconductor materials using block copolymer lithography
(2018)
Flynn, Shauna
Plasma-based surface Nanopatterning of semiconductor materials using block copolymer lithography
(2018)
Flynn, Shauna
Abstract:
This project focuses on utilising block copolymers (BCPs) to fabricate silicon nanopillar arrays. The rationale for this was to use these silicon nanopillar substrates as a master to fabricate polymer nanopillars through replica molding techniques for applications in antibacterial surfaces. In the process, we aim to investigate reactive ion etch plasmas to modify polymer brush layers and to selectively remove polymer material from the surface. The development of a highly-controlled annealing process for polystyrene – block – poly4vinylpyridine (PS – b – P4VP) using a custom built solvothermal annealing chamber was undertaken. This work eradicated the disadvantages associated with static annealing methods and allowed the fabrication of BCP templates with hexagonal ordering. The removal of P4VP cores using plasma was investigated. In this work, oxygen, argon and nitrogen plasmas were investigated. A key finding was that nitrogen plasmas were successful in removing P4VP over PS, with f...
http://doras.dcu.ie/22188/
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Energy-efficient resource allocation for edge computing based on models of power consumption
(2018)
Liu, Pengcheng
Energy-efficient resource allocation for edge computing based on models of power consumption
(2018)
Liu, Pengcheng
Abstract:
Computing services, when provided by Edge Networks rather than centralized clouds, are delivered close to the geographically extreme user edge. Edge computing enables functional offloading and improved scalability but suboptimal design of edge networks can result in needlessly high energy consumption and mismanagement of resources. Thus, how to effectively minimize the power dissipation of network resources at the edge is a significant problem as networks evolve. This thesis investigates a complete suite of energy efficient solution for the edge network. A frequency scalable router architecture, based on the Software Defined Network (SDN) concept, has been proposed. Two new control policies have been integrated with the proposed green architecture and their performance has been analysed to evaluate the trade-offs between energy efficiency and performance in frequency-scaled Network Devices. A Network Device Power Model (NDPM) has been formulated to explore the power dissipation char...
http://doras.dcu.ie/22677/
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Accurate and efficient full-wave modelling for indoor radio wave propagation
(2018)
Kavanagh, Ian
Accurate and efficient full-wave modelling for indoor radio wave propagation
(2018)
Kavanagh, Ian
Abstract:
The transition towards next-generation communication technologies has increased the need for accurate knowledge about the wireless channel. Knowledge of radio wave propagation is vital to the continued development of efficient wireless communications systems capable of providing a high data throughput and reliable connection. Thus, there is an increased need for accurate propagation models that can rapidly predict and describe the propagation channel. This is extremely challenging for indoor environments given the large variety of materials encountered and very complex and widely varying geometries.Currently, empirical or ray optical models are the most common for indoor propagation. Empirical models based on measurement campaigns provide limited accuracy, are very costly and time-consuming but provide rapid predictions. Deterministic models are applied to the geometrical representation of the environment and are based on Maxwell’s equations. They can produce more accurate predictio...
http://doras.dcu.ie/22611/
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Optical Safety Assessment of a Near-Infrared Brain-Computer Interface
(2008)
Soraghan, Christopher John; Ward, Tomas E.; Matthews, Fiachra; Markham, Charles
Optical Safety Assessment of a Near-Infrared Brain-Computer Interface
(2008)
Soraghan, Christopher John; Ward, Tomas E.; Matthews, Fiachra; Markham, Charles
Abstract:
This paper describes a safety assessment study of near-infrared sources used in an optical brain-computer interface (BCI). The measurement elements of an optical BCI consist of sets of optical sources and detectors. Our current system utilises sources which comprise of dual wavelength light emitting diodes (LED) at 760nm and 880nm. An optical analysis demonstrated that NIR radiation is a negligible source of heating in this case. LED heat conduction however is a major source of heating, and LEDs, though much safer than laser diodes, have been known to cause burns if improperly used. We describe a procedure by which we measure the heat conduction effect of LEDs. We show that the LED systems used in our current generation BCI produce safe levels of thermal energy and are within published safety levels.
http://mural.maynoothuniversity.ie/1254/
Marked
Mark
A final year undergraduate digital control laboratory assignment
(1994)
Ringwood, John; McCorkell, C.; Whelan, J.
A final year undergraduate digital control laboratory assignment
(1994)
Ringwood, John; McCorkell, C.; Whelan, J.
Abstract:
This paper describes a positive experience with a digital control assignment used in the BEng in Electronic Engineering course at Dublin City University (DCU). The objective of the assignment is to give the student considerable freedom in tackling a 'real-world' problem, involving modelling, control system design and implementation. Support is provided through documentation, a standard hardware/software platform, control system CAD tools and tutorials. The rig used is a fully instrumented coupled tanks apparatus. Completion of the assignment gives students a sense of confidence in tackling other practical, unknown problems, and gives them the sense of being true 'real-world' engineers.
http://mural.maynoothuniversity.ie/9541/
Marked
Mark
Formative assessment in mathematics for engineering students
(2017)
Ní Fhloinn, Eabhnat; Carr, Michael
Formative assessment in mathematics for engineering students
(2017)
Ní Fhloinn, Eabhnat; Carr, Michael
Abstract:
In this paper, we present a range of formative assessment types for engineering mathematics, including in-class exercises, homework, mock examination questions, table quizzes, presentations, critical analyses of statistical papers, peer-to-peer teaching, online assessments and electronic voting systems. We provide practical tips for the implementation of such assessments, with a particular focus on time or resource constraints and large class sizes, as well as effective methods of feedback. In addition, we consider the benefits of such formative assessments for students and staff.
http://doras.dcu.ie/22458/
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