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Displaying Results 151 - 175 of 1480 on page 7 of 60
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Performance analysis of high-speed optical packet switching in high performance computing and datacentre networks
(2016)
Jingyan, Wang
Performance analysis of high-speed optical packet switching in high performance computing and datacentre networks
(2016)
Jingyan, Wang
Abstract:
The massive growth in datacentre traffic, due to a huge increase in the deployment of data-intensive applications, is forcing datacentre infrastructure to migrate away from conventional electronic packet-switched networks, where capacity scaling imposes significant financial and technical constraints, and to evolve towards more advanced architectures. Motivated by this, new optical switching technologies and networking architectures, capable of providing very large bandwidth capacity, high scalability, high switching speed and high energy efficiency, are being targeted for building next-generation high-performance datacentre and High Performance Computing (HPC) networks. Optical packet switching technology is considered to be a long-term solution to meet these design challenges, as it can exploit fully the enormous potential capacity enabled by optics and support high switching flexibility at packet level. In this thesis, new wavelength-routed optical packet switching architectures,...
http://doras.dcu.ie/21240/
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Efficient hardware architecture for scalar multiplications on elliptic curves over prime field
(2016)
Javeed, Khalid
Efficient hardware architecture for scalar multiplications on elliptic curves over prime field
(2016)
Javeed, Khalid
Abstract:
Suitable cryptographic protocols are required to meet the growing demands for data security in many different systems, ranging from large servers to small hand-held devices. Many constraints such as computation time, silicon area, power consumption, and security level must be considered by the designers of hardware accelerators of the cryptogrpahic protocols. Elliptic curve cryptography (ECC) proposed by Koblitz and Miller, has been widely accepted. It is now considered as one of the best Public-Key Cryptography (PKC) algorithms and provides higher security strength per bit than RSA, with considerably smaller key sizes. For example, a 256-bit ECC can provide the same security strength as 3072-bit RSA. Due to its much smaller key sizes, ECC based crypto-systems are better in terms of bandwidth utilization, power consumption, and implementation cost as compared to the traditional RSA based crypto-systems. However, PKC algorithms, especially ECC are relatively expensive as compared to...
http://doras.dcu.ie/21377/
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Radiation-hard silicon photonics for future high energy physics experiments
(2017)
Zeiler, Marcel
Radiation-hard silicon photonics for future high energy physics experiments
(2017)
Zeiler, Marcel
Abstract:
Collisions of proton beams in the Large Hadron Collider at CERN produce very high radiation levels in the innermost parts of the particle detectors and enormous amounts of measurement data. Thousands of radiation-hard optical links based on directly-modulated laser diodes are thus installed in the particle detectors to transmit the measurement data to the processing electronics. The radiation levels in the innermost regions of future particle detectors will be much higher than they are now. Alternative solutions to laser-based radiation-hard optical links have to be found since the performance of laser diodes decreases beyond the operation margin of the system when irradiated to sufficiently high radiation levels. Silicon Photonics (SiPh) is currently being investigated as a promising alternative technology. First tests have indeed shown that SiPh Mach-Zehnder modulators (MZMs) are relatively insensitive to a high neutron fluence. However, they showed a strong degradation when expos...
http://doras.dcu.ie/21848/
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A validated computational fluid dynamics methodology for characterisation of fluid flow and heat transfer in unsteady jets
(2016)
Alimohammadi, Sajad
A validated computational fluid dynamics methodology for characterisation of fluid flow and heat transfer in unsteady jets
(2016)
Alimohammadi, Sajad
Abstract:
THESIS 10929
To improve reliability and avoid premature failure in electronic devices, more effective techniques must be used to dissipate the heat generated by devices. Thermal simulations can enable engineers to investigate and verify appropriate techniques at a very early stage of the design of the electronic device. It helps to improve cooling techniques by providing a visual representation of the complicated heat dissipation phenomenon inside the device. Due to high heat transfer coefficients and the enhanced efficiency, impinging jets are known as a desirable method of heat removal. This thesis reports on a comprehensive project which aimed to establish and validate a robust yet low-cost computational fluid dynamics (CFD) methodology to predict the fluid flow and heat transfer of steady and unsteady impinging jets, using in-house detailed experimental measurements for validation. A major focus in this study is on improving the accuracy of unsteady heat transfer simulations...
http://hdl.handle.net/2262/82889
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A Standard-based adaptive path to teach systems engineering: 15288 and 29110 standards use cases
(2017)
Bougaa, Mohammed; Bornhofen, Stefan; O'Connor, Rory; Riviere, Alain
A Standard-based adaptive path to teach systems engineering: 15288 and 29110 standards use cases
(2017)
Bougaa, Mohammed; Bornhofen, Stefan; O'Connor, Rory; Riviere, Alain
Abstract:
This paper discusses the use of two different standards for teaching Systems Engineering (SE): ISO/IEC/IEEE 15288 and ISO/IEC 29110. The first one is a general and widely- used standard describing the lifecycle processes of the entire system, whereas the second one is a relatively new standard based on a reduced set of standards elements focused on lifecycle profiles for Very Small Entities (VSEs). We are especially interested in the impact that SE standards can have on teaching this discipline to engineering students. We consider the teaching of fundamental principles of systems engineering. In this paper we illustrate how our, previously developed, standard based solution for systems engineering education can be used as a framework to support these standard-based teaching paths. We mainly focus on illustrating how adapting standard processes can be done, considering not only the learning goals, but also projects size and complexity, in a project-based learning environment. This pa...
http://doras.dcu.ie/21795/
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Krylov subspaces from bilinear representations of nonlinear systems
(2007)
Condon, Marissa; Ivanov, Rossen
Krylov subspaces from bilinear representations of nonlinear systems
(2007)
Condon, Marissa; Ivanov, Rossen
Abstract:
Purpose – The paper is aimed at the development of novel model reduction techniques for nonlinear systems. Design/methodology/approach – The analysis is based on the bilinear and polynomial representation of nonlinear systems and the exact solution of the bilinear system in terms of Volterra series. Two sets of Krylov subspaces are identified which capture the most essential part of the input-output behaviour of the system. Findings – The paper proposes two novel model-reduction strategies for nonlinear systems. The first involves the development, in a novel manner compared with previous approaches, of a reduced-order model from a bilinear representation of the system, while the second involves reducing a polynomial approximation using Krylov subspaces derived from a related bilinear representation. Both techniques are shown to be effective through the evidence of a standard test example. Research limitations/implications – The proposed methodology is applicable to so-called weakly ...
http://doras.dcu.ie/2438/
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Causal and stable reduced-order model for linear high-frequency systems
(2008)
Condon, Marissa; Grahovski, Georgi G.
Causal and stable reduced-order model for linear high-frequency systems
(2008)
Condon, Marissa; Grahovski, Georgi G.
Abstract:
With the ever-growing complexity of high-frequency systems in the electronic industry, formation of reduced-order models of these systems is paramount. In this reported work, two different techniques are combined to generate a stable and causal representation of the system. In particular, balanced truncation is combined with a Fourier series expansion approach. The efficacy of the proposed combined method is shown with an example.
http://doras.dcu.ie/4506/
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The Holland broadcast language
(2006)
Decraene, James
The Holland broadcast language
(2006)
Decraene, James
Abstract:
The broadcast language is a programming formalism devised by Holland in 1975, which aims at allowing Genetic Algorithms (GAs) to use an adaptable representation. A GA may provide an efficient method for adaption but still depends on the efficiency of the fitness function used. During long-term evolution, this efficiency could be limited by the fixed representation used by the GA to encode the problem. When a fitness function is very complex, it is desirable to adapt the problem representation employed by the fitness function. By adapting the representation, the broadcast language may overcome the deficiencies caused by fixed problem representation in GAs. This report describes an initial detailed specification and implementation of the broadcast language. Our first motivation is the fact that there is currently no published implementation of broadcast systems (broadcast language-based systems) available. Despite Holland presented the broadcast language in his book “Adaptation in Na...
http://doras.dcu.ie/4590/
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Model-order reduction techniques for the numerical solution of electromagnetic wave scattering problems
(2009)
Bradley, Patrick
Model-order reduction techniques for the numerical solution of electromagnetic wave scattering problems
(2009)
Bradley, Patrick
Abstract:
It is the aim of this work to contribute to the development of model-order reduction (MOR) techniques for the field of computational electromagnetics in relation to the electric field integral equation (EFIE) formulation. The ultimate goal is to enable a fast-sweep analysis. In a fast-sweep problem, some parameter on which the original problem depends is varying and the problem must be solved as the parameter changes over a desired parameter range. The complexity of the original model prohibits its direct use in simulation to compute the results at every required point. However, one can use MOR techniques to generate reduced-order models (ROMs), which can be rapidly solved to characterise the parameter-dependent behaviour of the system over the entire parameter range. This thesis focus is to implement robust, fast and accurate MOR techniques with strict error controls, for application with varying parameters, using the EFIE formulations. While these formulations result in matrices t...
http://doras.dcu.ie/4702/
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Traffic Control in Packet Switched Networks
(2010)
Adamovic, Ljiljana
Traffic Control in Packet Switched Networks
(2010)
Adamovic, Ljiljana
Abstract:
This thesis examines traffic control options available in two existing routing solutions in packet-switched networks. The first solution is the shortest path hop-by-hop routing deployed with the OSPF or IS-IS routing protocol and the IP forwarding protocol. This is the initially deployed and still the most popular routing solution in the Internet. The second solution is explicit routing implemented with the RSVP-TE or CR-LDP signalling protocol and the MPLS forwarding protocol. This is the latest solution to have become widely deployed in the Internet. The thesis analyses the limitations of the two routing solutions as tools for traffic control and yields new insights that can guide the analysis and design of protocols involved in the process. A set of recommendations for modifications of the existing protocols is provided which would allow for a range of new traffic control approaches to be deployed in packet-switched networks. For future routing solutions which comply with the pro...
http://doras.dcu.ie/15716/
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Energy Efficient Hardware Accelerators for Packet Classification and String Matching
(2010)
Kennedy, Alan
Energy Efficient Hardware Accelerators for Packet Classification and String Matching
(2010)
Kennedy, Alan
Abstract:
This thesis focuses on the design of new algorithms and energy efficient high throughput hardware accelerators that implement packet classification and fixed string matching. These computationally heavy and memory intensive tasks are used by networking equipment to inspect all packets at wire speed. The constant growth in Internet usage has made them increasingly difficult to implement at core network line speeds. Packet classification is used to sort packets into different flows by comparing their headers to a list of rules. A flow is used to decide a packet’s priority and the manner in which it is processed. Fixed string matching is used to inspect a packet’s payload to check if it contains any strings associated with known viruses, attacks or other harmful activities. The contributions of this thesis towards the area of packet classification are hardware accelerators that allow packet classification to be implemented at core network line speeds when classifying packets using rule...
http://doras.dcu.ie/15717/
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The Buffered Block Forward Backward technique for solving electromagnetic wave scattering problems
(2010)
Bogusevschi, Diana
The Buffered Block Forward Backward technique for solving electromagnetic wave scattering problems
(2010)
Bogusevschi, Diana
Abstract:
This work focuses on efficient numerical techniques for solving electromagnetic wave scattering problems. The research is focused on three main areas: scattering from perfect electric conductors, 2D dielectric scatterers and 3D dielectric scattering objects. The problem of fields scattered from perfect electric conductors is formulated using the Electric Field Integral Equation. The Coupled Field Integral Equation is used when a 2D homogeneous dielectric object is considered. The Combined Field Integral Equation describes the problem of scattering from 3D homogeneous dielectric objects. Discretising the Integral Equation Formulation using the Method of Moments creates the matrix equation that is to be solved. Due to the large number of discretisations necessary the resulting matrices are of significant size and therefore the matrix equations cannot be solved by direct inversion and iterative methods are employed instead. Various iterative techniques for solving the matrix equation a...
http://doras.dcu.ie/15144/
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Efficient domain decomposition methods for the electromagnetic analysis of dielectric objects
(2010)
Babu, Bijilash
Efficient domain decomposition methods for the electromagnetic analysis of dielectric objects
(2010)
Babu, Bijilash
http://doras.dcu.ie/15708/
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Electrical, Optical and acoustic diagnostics of atmospheric pressure gas discharges
(2011)
O'Connor, Niall
Electrical, Optical and acoustic diagnostics of atmospheric pressure gas discharges
(2011)
O'Connor, Niall
Abstract:
This thesis presents original diagnostic investigations of atmospheric pressure gaseous discharges, operating in owing helium and helium with low concentrations (0.1 - 1 %) of gas admixtures, together with novel biomedical surface functionalisations. The initial body of this work focuses on comprehensive electrical and optical diagnostics of the operation of an industrial scale dielectric barrier discharge (DBD), maintained in a 10 l/min w of both helium and helium with 1% admixed oxygen. The experimental results reveal a coupling between the power dissipated in the discharge and the discharge homogeneity which, in turn, correlates to a shift in the power supply operating frequency and species optical emission intensities. The shift in the operating frequency is shown to be dependent upon increased charge deposition on the electrodes, as the input power is increased, thus changing the overall system capacitance through charge-voltage LIssajous gure analyses. Furthermore it is demo...
http://doras.dcu.ie/16570/
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Compact modelling in RF CMOS technology
(2011)
Liu, Jun
Compact modelling in RF CMOS technology
(2011)
Liu, Jun
Abstract:
With the continuous downscaling of complementary metal-oxide-semiconductor (CMOS) technology, the RF performance of metal-oxide-semiconductor field transistors (MOSFETs) has considerably improved over the past years. Today, the standard CMOS technology has become a popular choice for realizing radio frequency (RF) applications. The focus of the thesis is on device compact modelling methodologies in RF CMOS. Compact models oriented to integrated circuit (ICs) computer automatic design (CAD) are the key component of a process design kit (PDK) and the bridge between design houses and foundries. In this work, a novel substrate model is proposed for accurately characterizing the behaviour of RF-MOSFETs with deep n-wells (DNW). A simple test structure is presented to directly access the substrate parasitics from two-port measurements in DNWs. The most important passive device in RFIC design in CMOS is the spiral inductor. A 1-pi model with a novel substrate network is proposed to characte...
http://doras.dcu.ie/16590/
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Efficient and accurate algorithms for ultra wideband wireless system propagation modelling and client location
(2011)
Diskin, John
Efficient and accurate algorithms for ultra wideband wireless system propagation modelling and client location
(2011)
Diskin, John
http://doras.dcu.ie/16080/
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An alternative audio web browsing solution: viewing web documents through a tree structural approach
(2006)
Walshe, Esmond
An alternative audio web browsing solution: viewing web documents through a tree structural approach
(2006)
Walshe, Esmond
Abstract:
This thesis examines methods to aid in the non-visual browsing of web based documcnts, primarily using synthetic speech output. The serial nature of speech ensures that it is a difficult medium in which to browse documents. Much of the structure implied in the visual appearance of the content is not available through specch. Only a narrow region in the content is perceivable at any given time, and it can bc difficult to navigate to the important segments of the document. This is in contrast to visual interaction, where cues such as changcs in font or colour establish contextual changes in the content and guide the user accordingly. A number of browsing/navigation strategies are presented to offset these problems. These are implemented through WebTree. This is a highly customisable web browser which rcnders documents through a dynamically expandable tree structural view. This mirrors the arrangement of mark-up elements in the source file. Contextual information about each element is...
http://doras.dcu.ie/16963/
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Investigation of doped cuprous halides for photovoltaic and display applications
(2011)
Vijayaraghavan, Rajani K.
Investigation of doped cuprous halides for photovoltaic and display applications
(2011)
Vijayaraghavan, Rajani K.
Abstract:
The thesis mainly focuses on the growth and optoelectronic characterisation of the doped cuprous halides (CuX) with high UV/blue emission properties and the light harvesting in the CuBr/Si based heterojunction photovoltaic (PV) cells. Since cuprous halides are short wavelength emitters with high excitonic binding energies, growth of lower resistivity, highly luminescent p and n-type films are essential for the development of the future excitonic based light emitting devices with these materials. We describe the deposition and characterisation of the Zn doped n-type CuCl and oxygen doped p-type CuBr with higher carrier concentration using pulsed dc magnetron sputtering and thermal evaporation followed by oxygen plasma exposure, respectively. The structural and morphological properties of the n-type Zn doped CuCl films are investigated using XRD, SEM and AFM measurements. Our findings show that, the crystallinity of CuCl increases with doping of Zn and the maximum is obtained for the ...
http://doras.dcu.ie/16694/
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Optimisation and fabrication of ultra violet emitting CuC1 thin films by RF sputtering
(2007)
Natarajan, Gomathi
Optimisation and fabrication of ultra violet emitting CuC1 thin films by RF sputtering
(2007)
Natarajan, Gomathi
Abstract:
Wide direct band gap CuCl is a promlslng candidate for the next generation Si based optoelectronics, thanks to its excellent properties such as high excltonic binding energy (190 meV) and a close lattice matching with Si. In this thesis, growth of CuCl using RF magnetron sputtering is investigated in detail. Stoichiometry and microstructure are the two major deciding factors for the UV emission from the film. We have successfully controlled both these properties by varying the sputtering parameters. Chemical stoichiometry was mainly controlled by the spacing between the target and substrate. An optimum spacing of 6 cm was found to yield films with Cu/Cl ratio almost close to stoichiometry (Cu/Cl = 0.94). A more fine control was achieved providing a suitable bias to the substrate and high quality stoichiometric CuCl films were obtained. Microstructural evaluation revealed that the grain interface area of the film increases on increasing the sputtering pressure. UV emission properti...
http://doras.dcu.ie/16971/
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Network support for multimedia applications using the Netlets architecture
(2004)
Dharmalingam, Kalaiarul
Network support for multimedia applications using the Netlets architecture
(2004)
Dharmalingam, Kalaiarul
Abstract:
Multi-party multimedia networking applications such as e-commerce, distributed data analysis, Internet TV and advanced collaborative environments feature stringent end-to-end Quality of Service (QoS) requirement and require globally distributed user groups to be interconnected. The variety of delivery requirements posed by such applications are best satisfied using highly customised networking protocols. Hence, a demand for networks to migrate from the current fixed service model to a more flexible architecture that accommodates a wide variety of networking services is emerging. New approaches are required in order to build such service oriented networks. Active networking is one such approach. Active networks treats the network as a programmable computation engine, which provides customised packet processing and forwarding operations for traffic flowing through network nodes. User applications can download new protocols into network elements at runtime, allowing rapid innovation o...
http://doras.dcu.ie/17334/
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Using audio-based signal processing to passively monitor road traffic
(2006)
Duffner, Orla
Using audio-based signal processing to passively monitor road traffic
(2006)
Duffner, Orla
Abstract:
The adaptive management of vehicular tra ffic on roads is a key transportation application. Sensors are required to provide information describing the behaviour of traffic in the region to be monitored. There is scope for a low-budget, efficient and robust traffic monitoring system. The hypothesis is th a t an audio-based approach provides a highly economical and efficient solution to monitor road traffic. The main contributions of this thesis may be summarised as follows. In order to determine their behaviour over time, in d iv idual vehicles are successfully tracked with an efficient source localization technique based on acoustic information. The vehicle source location is determined by the inter-signal time delay of two cross-correlated microphones, known as the time delay of arrival (TDOA) localization method. A moving source model is derived from firs t principles to simulate the time-delay pattern due to changes in source location as a vehicle approaches and passes the array...
http://doras.dcu.ie/17378/
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Scalable QoS routing in MPLS networks using mobile code
(2006)
Dragos, Sanda-Maria
Scalable QoS routing in MPLS networks using mobile code
(2006)
Dragos, Sanda-Maria
Abstract:
In a continually evolving Internet, tools such as Q u a lity o f Service ro u tin g must be used in order to accommodate user demands. However, deploying and developing QoS routing in the legacy Internet is difficult. Multiprotocol Label Switching (MPLS) facilitates the deployment of QoS routing, due to its separation of functions between the control and forwarding plane. Developing QoS routing raises scalability issues within very large networks. I propose overcoming these issues by using topology aggregation and distributed routing based on modem techniques such as active networks and mobile agents. However, topology aggregation introduces inaccuracy, which has a negative impact on QoS routing performance. To avoid such problems I propose a hierarchical routing protocol, called Macro-routing, which by using distributed route computation is able to process more detailed information and thus to use the most accurate aggregation technique, i.e. Full-Mesh. Therefore, the protocol is m...
http://doras.dcu.ie/17408/
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White beam synchrotron x-ray topography and micro-raman spectroscopy characterization of crystal materials
(2003)
Chen, Weimin
White beam synchrotron x-ray topography and micro-raman spectroscopy characterization of crystal materials
(2003)
Chen, Weimin
Abstract:
The White Beam Synchrotron X-Ray Topography (WBSXRT) technique was used to assess sapphire wafer quality. The dislocation distribution, dislocation density, Burgers vectors of selected dislocations and stacking faults in the sapphire wafers were studied. A correlation between the sapphire quality and its performance as an X-ray backscattering mirror was established in this study. The results reveal the high quality of the inspected Heat-Exchanger Method produced sapphire wafers and their subsequent improved performance as Bragg backscattering mirrors. Wing tilts in the epitaxial lateral overgrowth (ELO) of GaN on sapphire substrates using a Si02 mask were observed and measured with the WBSXT method. The wing tilt increases as the fill factor (ratio of stripe opening width to stripe period) increases and asymmetric wing tilts are observed in all samples with different fill factors. The crystal misorientation in the window regions and beneath the seed layer is approximately an order ...
http://doras.dcu.ie/17436/
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Investigation of in-situ parameter control in novel semiconductor optical amplifiers
(2012)
Carney, Kevin
Investigation of in-situ parameter control in novel semiconductor optical amplifiers
(2012)
Carney, Kevin
Abstract:
Fibre optic networks form the backbone of modern communications systems. As demand for ever increasing bandwidth continues to grow, technologies that enable the expansion of optical networks will be the key to future development. The semiconductor optical amplifier (SOA) is a technology that may be crucial in future optical networks, as a low cost in-line amplifier or as a functional element. As fibre networks extend closer to the end user, economical ways of improving the reach of these networks are important. SOAs are small, relatively inexpensive and can be readily integrated in photonic circuits. Problems persist with the development of SOAs, however, in the form of a relatively high noise figure and low saturation output power, which limits their use in many circumstances. The aim of this thesis is to outline a concept for control of these parameters such that the SOA can achieve the performance required. The concept relies on the control of the carrier density distribution in ...
http://doras.dcu.ie/17054/
Marked
Mark
Energy-efficient routing protocols in heterogeneous wireless sensor networks
(2013)
Wu, Mei
Energy-efficient routing protocols in heterogeneous wireless sensor networks
(2013)
Wu, Mei
Abstract:
Sensor networks feature low-cost sensor devices with wireless network capability, limited transmit power, resource constraints and limited battery energy. The usage of cheap and tiny wireless sensors will allow very large networks to be deployed at a feasible cost to provide a bridge between information systems and the physical world. Such large-scale deployments will require routing protocols that scale to large network sizes in an energy-efficient way. This thesis addresses the design of such network routing methods. A classification of existing routing protocols and the key factors in their design (i.e., hardware, topology, applications) provides the motivation for the new three-tier architecture for heterogeneous networks built upon a generic software framework (GSF). A range of new routing algorithms have hence been developed with the design goals of scalability and energy-efficient performance of network protocols. They are respectively TinyReg - a routing algorithm based on ...
http://doras.dcu.ie/17668/
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