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Current Search:
All of 'Electronic' and 'Engineering' in all fields;
1480 items found
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Displaying Results 76 - 100 of 1480 on page 4 of 60
Marked
Mark
An experimental design framework for evolutionary robotics
(1996)
McCartney, Robert
An experimental design framework for evolutionary robotics
(1996)
McCartney, Robert
Abstract:
Based on the failures of work in the area of machine intelligence in the past, a new paradigm has been proposed: for a machine to develop intelligence it should be able to interact with and survive within a hostile dynamic environment. It should therefore be able to display adaptive behaviour and respond correctly to changes in its situation. This means that before higher cognitive properties can be modeled, the modeling of the lower levels of intelligence would be achieved first. Only by building on this platform of physical and mental abilities may it be possible to develop true intelligence. One train of thought for implementing this is to control and design a robot by modeling the neuroethology of simpler animals such as insects. This thesis outlines one approach to the design and development of such a robot, controlled by a neural network, by combining the work of a number of researchers in the areas of machine intelligence and artificial life. It involves Rodney Brooks’ subsu...
http://doras.dcu.ie/19013/
Marked
Mark
The application of adaptive fuzzy control to a warm water process
(1995)
McCormac, Stephen E
The application of adaptive fuzzy control to a warm water process
(1995)
McCormac, Stephen E
http://doras.dcu.ie/19017/
Marked
Mark
A code excited linear predictive coder: using a moments algorithm
(1993)
Meehan, David
A code excited linear predictive coder: using a moments algorithm
(1993)
Meehan, David
Abstract:
A speech coding algorithm was developed which was based on a new method of selecting the excitation signal from a codebook of residual error sequences. The residual error sequences in the codebook were generated from 512 frames of real speech signals. L.P.C. inverse filtering was used to obtain the residual signal. Each residual error signal was assigned an index. The index was generated using a moments algorithm. These indices were stored on a Graded Binary Tree. A Binary Search was then used to select the correct index. The use of a Graded Binary Tree in the coding algorithm reduced the search time. The algorithm faithfully reproduced the original speech when the test residual error signal was chosen from the training data. When the test residual error signal was outside the training data, synthetic speech of a recognisable quality was produced. Finally, the fundamentals of speech coders are discussed in detail and various developments are suggested.
http://doras.dcu.ie/19070/
Marked
Mark
Investigation into zero-crossing techniques as a viable means of speech recognition
(1996)
Newsome, Keith J
Investigation into zero-crossing techniques as a viable means of speech recognition
(1996)
Newsome, Keith J
Abstract:
The idea behind this research is to demonstrate how a fundamental characteristic of speech (zero-crossing information) may be exploited in the development of a low cost, highly effective speech recognition system. The system is to be used to recognise a small vocabulary of isolated speech. Although intended to be speaker dependent, the system is also tested for speaker independence. A brief description of how speech is produced and recognised by a human subject is first presented. Following this, some features of both voiced and unvoiced speech signals and their associated spectra are discussed in relation to zero-crossing information. Phonemes and their segmentation (using zero-crossing data or otherwise) are also examined. A brief discussion of stationarity and its effects on zero-crossings is then given. The choice of pre-processing filters is also mentioned. Two methods of speech recognition implementing zero-crossing information are then discussed. The first technique studie...
http://doras.dcu.ie/19139/
Marked
Mark
Vowel coding using an articulatory model
(1988)
Murphy, Mary
Vowel coding using an articulatory model
(1988)
Murphy, Mary
Abstract:
An investigation into articulatory vocoding for vowels, as a means of achieving high quality coding at low bit rates, is carried out in this thesis. Methods of estimating the vocal tract transfer function from the speech wave are compared, and an algorithm for closed glottis interval (CGI) analysis is developed. CGI analysis is chosen over autocorrelation based inverse filtering methods. Various distortion measures for use in Vector Quantization are evaluated, and a new covariance distortion measure is proposed. It is shown that this measure yields close matches from an acoustic codebook. An articulatory coding system is designed, including a linked codebook of articulatory shapes, based on synthetic speech. A method of generating a similar codebook from real speech is proposed, and an investigation into estimating articulatory parameters from the speech wave is carried out to this end.
http://doras.dcu.ie/19116/
Marked
Mark
Fractal methods in image analysis and coding
(2001)
Neary, David
Fractal methods in image analysis and coding
(2001)
Neary, David
Abstract:
In this thesis we present an overview of image processing techniques which use fractal methods in some way. We show how these fields relate to each other, and examine various aspects of fractal methods in each area. The three principal fields of image processing and analysis th a t we examine are texture classification, image segmentation and image coding. In the area of texture classification, we examine fractal dimension estimators, comparing these methods to other methods in use, and to each other. We attempt to explain why differences arise between various estimators of the same quantity. We also examine texture generation methods which use fractal dimension to generate textures of varying complexity. We examine how fractal dimension can contribute to image segmentation methods. We also present an in-depth analysis of a novel segmentation scheme based on fractal coding. Finally, we present an overview of fractal and wavelet image coding, and the links between the two. We exa...
http://doras.dcu.ie/19131/
Marked
Mark
Multi-precision arithmetic on a DSP
(1992)
Murtagh, Dara
Multi-precision arithmetic on a DSP
(1992)
Murtagh, Dara
Abstract:
The aim of this project has been to develop the assembly language functions needed to allow easy implementation in real-time of a secure speech channel. The theory of security systems is introduced and developed. Encryption algorithms are described. A library of multi-precision arithmetic routines has been written for use on the TMS320C25 digital signed processor. These routines are compatible with code produced by the TMS320C25 C Compiler. Multi-precision arithmetic is used in public key encryption which requires large number arithmetic for security and which also has real-time operation requirements. An overview of DSP use in this kind of application is given, the design, implementation and test of these routines is described and some application examples and timings are shown.
http://doras.dcu.ie/19128/
Marked
Mark
A performance model of a telecommunications network structured according to intelligent network principles
(1997)
Newcombe, A. G
A performance model of a telecommunications network structured according to intelligent network principles
(1997)
Newcombe, A. G
Abstract:
The Intelligent Network (IN) is an telecommunications services architecture which enables the rapid creation and deployment of supplementary telecommunications services. However, this flexibility makes the management of the network performance critical in ensuring that customers receive their expected Quality of Service. This thesis describes a model which has been developed to predict the delays in the network due to IN-specific service processing. The model proposed is a queuing network which builds on the existing state of the art as follows. The characteristics of the flows between the IN physical entities are considered and general service time distributions are assumed at each entity. Additionally, the model allows the reservation of capacities as the SCP for each service type. An analytic formulation was developed using the decomposition approximate method. The model was also simulated in order to ascertain its’ accuracy. The results of the analytic solution and the simulat...
http://doras.dcu.ie/19138/
Marked
Mark
Training platform for the design of a windows multimedia device
(1995)
O'Donnell, G. P.
Training platform for the design of a windows multimedia device
(1995)
O'Donnell, G. P.
Abstract:
There are many Windows Multimedia plug-in cards available for a Personal Computer (PC), but they are not suitable for a laboratory teaching platform for several reasons. Firstly, their hardware and software details are not available because of the market driven need to keep all hardware and software details from competitors. Secondly, the cards are not designed to allow faults to be introduced. Thirdly there is the inherent requirement that Windows applications be uniform to the point where application software sees the same interface, irrespective o f which Windows compatible card is being used. These latter points are highly desirable from the user's point of view but not from a teaching viewpoint, where the goal is to enlighten the student in the hardware and software design techniques used to perform the stated objective. The Multimedia Teaching Platform consists of a sound card, Windows 3.1 application and a Windows standard mode device driver. The sound card can continuo...
http://doras.dcu.ie/19204/
Marked
Mark
Network optimisation package for the design and analysis of survivable SDH networks
(1998)
O'Hara, James
Network optimisation package for the design and analysis of survivable SDH networks
(1998)
O'Hara, James
Abstract:
The advancements in digital technology and the resultant economies of scale offered by high capacity fibre transmission systems have enabled network operators to provide more cost-effective telecommunications services to their increasing customer base. However, with the deployment of such systems, the emphasis on service quality and network reliability has increased considerably. To address this and many other network management issues, the SDH digital transmission standard was established. While supporting enhanced network management functionality, it was only through the subsequent development of highly intelligent Network Elements (NEs) that the inherent cost benefits of SDH have been realised. Each NE is characterised by its own topology and associated restoration schemes. As the economic viability of these survivable topologies are dependent on varying network conditions, it has been shown that the most cost-effective networks will be based on a combination of these topologies....
http://doras.dcu.ie/19225/
Marked
Mark
Design, construction and characterisation of a variable balance magnetron sputtering system
(1999)
O'Leary, Colm
Design, construction and characterisation of a variable balance magnetron sputtering system
(1999)
O'Leary, Colm
Abstract:
In many plasma deposition systems it is necessary to monitor and control the flux of species bombarding the substrate in order to control film growth kinetics. The ability of controlling this growth can lead to desirable changes in the films structure and properties. Presented in the following thesis is a report on the design and construction of a variable balance magnetron sputtering system with an energy resolved mass spectrometer. Also reported is the characterisation of the deposition process at various degrees of magnetron unbalance. This unbalance is controlled by varying the current / in a solenoid, which is the central pole of a cylindrical magnetron, place behind the sputtering target. The current 1 is found to ultimately control the deposition conditions at constant pressures and levels of discharge current. It is also found to directly control the energy and flux of species bombarding the substrate during deposition. This data and the effects on the film properties are re...
http://doras.dcu.ie/19240/
Marked
Mark
Investigation of compression algorithms for the purposes of medical archiving and remote diagnostics
(1999)
Rochford, Raymond
Investigation of compression algorithms for the purposes of medical archiving and remote diagnostics
(1999)
Rochford, Raymond
Abstract:
The objective of this research is to investigate compression algorithms for the purposes o f medical archiving and remote diagnostics. A single X-ray of size 1024 by 1024 pixels at 8 bit resolution occupies approximately 1 Mbyte of storage space and takes approximately 8 minutes to transmit over a standard telephone line. There is a need to reduce both required storage space and transmission time. This is achieved by compressing the image. For archiving, a lossless compression algorithm is used and for remote diagnostics a lossy compression algorithm is used. The development of an application for the transmission of images from the server application to a client application using the Internet is also investigated. The performances of three lossless compression algorithms are investigated: Huffman Coding, Arithmetic Coding and Huffman Coding using Splay Trees. These algorithms are written in C, transformed into (Dynamic Linked Library) DLLs using Visual C++ for use in a Visual Basic...
http://doras.dcu.ie/19318/
Marked
Mark
Flow and congestion control in frame relay networks
(1993)
Sahgal, Anuradha
Flow and congestion control in frame relay networks
(1993)
Sahgal, Anuradha
Abstract:
This thesis describes the algorithms developed to improve the overload performance of frame relay networks. These algorithms were developed by incorporating a number of congestion control techniques in the existing LAPD protocol (as defined in recommendation CCITT Q.920-Q.921). In addition, the performance analysis of the model is given. Simulation models were developed to evaluate the performance of these networks. A network simulation tool, OPNET, was used for this purpose. The performance of the enhanced model was compared with the existing protocol. A significant improvement was observed in the throughput and delay performance of frame relay networks. The results were obtained by executing extensive simulations and collecting data over a number of simulation runs. The effectiveness of the congestion control techniques was tested by analysing the dynamic performance of the model. These techniques, if implemented in the existing protocol, will ensure the good userperceived netw...
http://doras.dcu.ie/19348/
Marked
Mark
Application of estimation techniques to biotechnical processes
(1991)
Tan, Liang
Application of estimation techniques to biotechnical processes
(1991)
Tan, Liang
Abstract:
It is acknowledged that to significantly improve biochemical system performance control should be implemented in real-time. Control algorithms, particularly modem control algorithms, require knowledge of the process dynamics and continuous measurement or detection of the system states and outputs. In many processes state variables cannot be measured on-line due, for example, to the non-availability of on-line sensors. Estimation techniques can be applied to estimate nonmeasurable state variables. Such techniques in general require the use of accurate system models. In this thesis simplified yet nonlinear models of fed-batch and batch fermentation processes are presented. Details of modelling and simulation studies carried out on a Baker’s Yeast fermentation process are included. Variations of the basic models are considered and tested using computer simulation with a view to evaluating the effect of different influences on the specific biomass growth rates. Results presented using...
http://doras.dcu.ie/19436/
Marked
Mark
Prediction and reduction of third-order IMD in multichannel amplifiers
(1999)
Sheridan, Paul
Prediction and reduction of third-order IMD in multichannel amplifiers
(1999)
Sheridan, Paul
Abstract:
The advent of the multichannel amplifer (MCA) has brought with it strigent intermodulation distortion (IMD) requirements. This thesis explores the issue of thirdorder intermodulation distortion (/M3) in M C A ’s from two seperate viewpoints. Firstly, the prediction of IM 3 levels in MCA’s is investigated and a novel software based prediction tool is presented. The amplifier is viewed as a black-box nonlinear circuit and is characterised by carrying out an IMD test using 3 tones of equal amplitude. Then, by using the Volterra-series approach and linear interpolation, an IM :i prediction can be made for an arbitrary number of input tones of different amplitudes. To demonstrate and verify the capability of this technique predicted and measured results are compared for single and cascaded stages. Secondly and finally, a novel amplifier configuration which reduces these IM 3 levels and simultaneously improves the overall efficiency of the M C A is presented. This approach uses a scaled...
http://doras.dcu.ie/19420/
Marked
Mark
MPEG-4's BIFS-Anim protocol: using MPEG-4 for streaming of 3D animations
(2000)
Walsh, Tony
MPEG-4's BIFS-Anim protocol: using MPEG-4 for streaming of 3D animations
(2000)
Walsh, Tony
Abstract:
This thesis explores issues related to the generation and animation of synthetic objects within the context of MPEG-4. MPEG-4 was designed to provide a standard that will deliver rich multimedia content on many different platforms and networks. MPEG-4 should be viewed as a toolbox rather than as a monolithic standard as each implementer of the standard will pick the necessary tools adequate to their needs, likely to be a small subset of the available tools. The subset of MPEG-4 that will be examined here are the tools relating to the generation of 3D scenes and to the animation of those scenes. A comparison with the most popular 3D standard, Virtual Reality Modeling Language (VRML) will be included. An overview of the MPEG-4 standard will be given, describing the basic concepts. MPEG-4 uses a scene description language called Binary Format for Scene (BIFS) for the composition of scenes, this description language will be described. The potential for the technology used in BIFS to pr...
http://doras.dcu.ie/19459/
Marked
Mark
The internet integrated intelligent network
(1999)
Vasic, Jelena
The internet integrated intelligent network
(1999)
Vasic, Jelena
Abstract:
This thesis is based on research, design and prototype implementation work done towards defining an Intelligent Network system integrated with Internet functionality and potential services to be provided by such a system. The main driving force behind the project has been an idea to explore the possibility of adding value to services offered by the two most ubiquitous public communication networks of today, by connecting those networks. The goal of the project was to define such a connection and the services that would become possible through its existence. The thesis begins with presenting the background to the project. First of all, it contains the definition and description of Intelligent Networks, as the standard means of providing, in telephone networks, services other than basic connectivity. Further, it defines the Internet and looks at the already existent computer network - telephone network integration systems. In the second part of the thesis, the design of the Internet...
http://doras.dcu.ie/19449/
Marked
Mark
Real-time implementation of an object-based codec
(1997)
Connor, Fergal
Real-time implementation of an object-based codec
(1997)
Connor, Fergal
Abstract:
Modern video coding algorithms are becoming increasingly complex with the result that single general purpose processors are incapable of meeting the computational power required for real time implementation. The coding algorithms are continuously evolving therefore, any multiprocessor solution must not only possess the necessary computational power but must also be flexible enough to adapt to any modifications in the algorithms. This report presents a possible multiprocessor solution with specific reference to the DCU object-based analysis-synthesis coder. Firstly, an abstract model of the multiprocessor system is defined. The model is based on the dual requirements of computational power and flexibility. An analysis of the DCU coding algorithm is performed in order to refine the basic model by identifying potential realisation options that optimise coder performance. A reciprocal relationship exists whereby hardware constraints require modification of the algorithm. Any modificati...
http://doras.dcu.ie/19494/
Marked
Mark
Intelligent control of industrial processes
(1989)
McDonnell, Mark A
Intelligent control of industrial processes
(1989)
McDonnell, Mark A
Abstract:
A detailed survey of the field of intelligent control is presented. Current practices are reviewed and the need for a unifying framework to identify and strengthen the underlying core principles is postulated. Intelligent control is redefined to make explicit use of human systems in control as a reference model. Psychological theories of intelligent behaviour reveal certain basic attributes. From these a set of necessary and sufficient conditions for intelligent control are derived. Learning ability is identified as a crucial element. Necessary attributes for learning are prediction capabilities, internal world model, estimation of the model parameters, and active probing to reduce uncertainties. This framewoik is used to define a Learning Based Predictive Control (LBPC) strategy. LBPC is derived from Predictive Functional Control techniques with an adaptive layer implemented by recursive least squares. Improved performance above conventional adaptive control is demonstrated. Distri...
http://doras.dcu.ie/19548/
Marked
Mark
A project based approach to learning for first year engineering students
(2008)
Corcoran, Brian; Whelan, John
A project based approach to learning for first year engineering students
(2008)
Corcoran, Brian; Whelan, John
Abstract:
Support for transition from Leaving Certificate and entry to college for 1st year engineering students can be difficult to achieve. This new course offers an innovative project based approach to learning for 1st years with an introduction to design to build confidence in student ability and give motivation in research and discovery skills. The project takes place in small groups and relies heavily on presentation, group and individual skills. The Mechanical and Manufacturing and the Electronic Engineering Schools at Dublin City University offered this new module for all first year Engineering Students in 2006. The course entitled, ‘Project and Laboratory Skills’ was an immediate success with increased participation and retention rates and a high level of academic success in assessment. This paper highlights the overall module concepts, teaching and learning outcomes and the resources required for such a module.
http://doras.dcu.ie/694/
Marked
Mark
Teaching engineering design through Lego Mindstorms
(2005)
Ringwood, John; Monaghan, Karl; Maloco, John
Teaching engineering design through Lego Mindstorms
(2005)
Ringwood, John; Monaghan, Karl; Maloco, John
Abstract:
This paper examines a particular methodology of teaching engineering design to undergraduate engineering students, which relies on Lego® Mindstormsâ¢. A number of important issues are addressed, including the timing of the design module within the programme, prior knowledge required and assessment components. The module, which has been running for three years, was found to have many positive attributes, not only in relation to the core design activity, but also in generating good team-building and engaging students with the degree programme.
http://mural.maynoothuniversity.ie/1016/
Marked
Mark
MyVLE: An Engineering-centric e-learning Platform
(2006)
Monaghan, Karl; Villing, Rudi; Ward, Tomas E.
MyVLE: An Engineering-centric e-learning Platform
(2006)
Monaghan, Karl; Villing, Rudi; Ward, Tomas E.
Abstract:
This paper reports on certain key aspects of the design, building and testing of MyVLE, an internet-based e-learning system that is used at NUI Maynooth for the delivery of a remote program in engineering education. The system was designed from first principles with strong support for numerical disciplines integrated at the outset. The paper will describe in some detail the most novel components of the software viz. the engineering science focused interactive quiz feature and the results management component. Further we describe the background to such learning environments, the rationale behind our decision to custom-build a solution as well as drawing focus to the field of distance learning in engineering education in Ireland. This work should be of interest to researchers in distance learning in engineering and the sciences as a consequence of the finished system’s modest build cost, numerical discipline support, scalable architecture, pedagogical flexibility and recorded impact.
http://mural.maynoothuniversity.ie/1350/
Marked
Mark
PBL Applied to Software Engineering Group Projects
(2002)
Delaney, Declan; Mitchell, George G.
PBL Applied to Software Engineering Group Projects
(2002)
Delaney, Declan; Mitchell, George G.
Abstract:
This paper describes the application of Problem-based learning (PBL) to the design and implementation of an E-commerce web site by small groups of software engineering students. This work is part of a real-world software engineering course, taught to pre-internship students. The use of PBL has gained significant interest since its inception in the late 1950's, and its later adaptation to small team-based learning in the early 1960s. By combining the PBL paradigm along with the experience of teaching a 'traditional' software engineering course, and by analyzing feedback from industry, a course, which we believe provides students with new insights into real-world software engineering projects, has been developed. Initially students were formed into teams of 4 or 5 members based on the weak-strong selection technique. The course began with team-building activities, after which the E-commerce project proposal was presented to the teams. The teams were given com...
http://mural.maynoothuniversity.ie/89/
Marked
Mark
Remote access to continuing engineering education - RACeE
(1997)
Whelan, Paul F.
Remote access to continuing engineering education - RACeE
(1997)
Whelan, Paul F.
Abstract:
This paper discusses the issues involved with the development and implementation of an on-line postgraduate course for remote-access students. This is especially relevant for students who wish to pursue postgraduate qualifications, or to update their skill base, while continuing with their career. Although remote-access education would not be considered by the author as the delivery method of choice for the majority of an engineering student's educational needs, there will always be niche educational demands that can be addressed by such an approach. Although the electronic presentation of course notes via the Internet is becoming more commonplace, the ideas outlined in this paper go beyond this basic concept. The emphasis of any remote-access-based educational strategy has to be on the interaction between the tutor and the students, and not on note presentation.
http://doras.dcu.ie/2451/
Marked
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A Novel Smart Device Student Response System For Supporting High Quality Active Learning In The Engineering And Science Disciplines
(2015)
McLoone, Seamus; Villing, Rudi; O'Keeffe, Simon
A Novel Smart Device Student Response System For Supporting High Quality Active Learning In The Engineering And Science Disciplines
(2015)
McLoone, Seamus; Villing, Rudi; O'Keeffe, Simon
Abstract:
This paper proposes and presents a unique smart device student response system (SDSRS) that allows for a more flexible input than existing classroom response systems, such as clickers. This, in turn, allows students to respond to the lecturer with higher quality and more relevant information and, thus, improves their active learning. This is of particular relevance in the science and engineering disciplines where methodology is as important, if not more so, than the final answer. The SDSRS allows the lecturer to quickly obtain this pertinent information in real-time within the classroom environment. The proposed system consists of three main elements, namely a student sketch application, a lecturer view-and-edit application and a central cloud-based service to co-ordinate the exchange of information between the two applications. The system was evaluated within two different engineering classrooms, with very positive feedback obtained from both the lecturers and students involved. De...
http://mural.maynoothuniversity.ie/6334/
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