Doctoral Degrees (Electrical and Electronic Engineering)
Recent Submissions
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Training neural word embeddings for transfer learning and translation
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: In contrast to only a decade ago, it is now easy to collect large text corpora from theWeb on any topic imaginable. However, in order for information processing systems to perform a useful task, such as ...
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SQUID geomagnetic signal analysis and modelling of Schumann Resonances in the earth-ionosphere cavity
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Due to its extreme sensitivity to magnetic flux, vast dynamic range and wide bandwidth, the Superconductive Quantum Interference Device (SQUID) is at the frontier of all existing magnetic field sensors. ...
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Automated aerial refuelling of a large receiver aircraft
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Performing aerial refueling of a large receiver is an extremely strenuous task for a pilot. Automating the aerial refueling for a large receiver is thus highly desirable. While significant research has ...
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Miniaturised multilayer RF and microwave Circuits
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Ceramic and laminate multilayered technologies are explored in the design of novel circuit topologies and in novel implementations of classical circuit topologies. A cross-slot coupled filter topology ...
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Spinning solar sail : the deployment and control of a spinning solar sail satellite
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Solar sailing has become a viable and practical option for current satellite missions. A spinning solar sail has a number advantages above a 3-axis stabilised sail. A spinning sail is more resistant to ...
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Design of a dual-polarized dense dipole array for SKA mid-frequency aperture array
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: This dissertation presents the design of a dual-polarized Dense Dipole Array, or “DDA”, as a candidate element for the SKA Mid-Frequency Aperture Array. The design consists of tightly coupled dipole ...
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A Fixed Switching Frequency technique for finite-set model predictive control of power electronic converters
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: A fixed switching frequency scheme for finite-control-set model predictive control is resented. The purpose of the control scheme is to achieve an output waveform quality that compares well to that of a ...
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Evaluation and design aspects of magnetic gears and magnetically geared electrical machines
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: In the past decade, magnetic gears and magnetically geared electrical machines have emerged as electromechanical devices with exceptionally high torque densities. Their distinct advantages such as low ...
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Karoo Array Telescope site shielding : laboratory, computational and multi-copter studies
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The Northern Cape in South Africa has been chosen to host the Square Kilometre Array (SKA) due to the area’s overall radio quietness. As part of the supporting systems for the Karoo Array Telescope ...
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Prosody modelling for a Sesotho text-to-speech system using the Fujisaki model
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: Please refer to full text for abstract.
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Multi-mode antennas for hemispherical field-of-view coverage
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: This dissertation proposes a multi-mode antenna element excited through a multiconductor feed. It is shown that each of the orthogonal transverse electromagnetic modes supported by the antenna feed ...
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Circuit model design of conical transmission line power combiners and isolation of reactive combiners
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: This dissertation presents a circuit-based design technique that leads to benefits in terms of the physical size, manufacturability, and exibility in the design of N-way conical line power combiners. ...
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Modal-based design techniques for circular quadruple-ridged flared horn antennas
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: This dissertation presents modal-based techniques for the effective systematic design of quadruple-ridged flared horns (QRFHs) as reflector feeds for radio astronomy applications. A new excitation ...
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RSFQ digital circuit design automation and optimisation
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: In order to facilitate the creation of complex and robust RSFQ digital logic circuits an extensive library of electronic design automation (EDA) tools is a necessity. It is the aim of this work to ...
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Efficient numerical analysis of finite antenna arrays using domain decomposition methods
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: This work considers the efficient numerical analysis of large, aperiodic finite antenna arrays. A Method of Moments (MoM) based domain decomposition technique called the Domain Green's Function Method ...
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Reverberation chamber time and frequency metrology for MeerKAT systems shielding evaluation
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: Electromagnetic shielding plays a significant role in the protection of electronic equipment. Its application is essential for mitigating radio-frequency interference for the Karoo Array Telescope ...
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Synthesis methods for multi-band coupled resonator filters
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: In this dissertation a number of techniques to design multi-band filters, with specific focus on coupled resonator implementations, is presented. Multi-band transfer functions are constructed from ...
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Critical evaluation and application of position sensorless control techniques for reluctance synchronous machines
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: The position sensorless controllability of the reluctance synchronous machine (RSM) is investigated in this thesis with the focus on industry applications where variable and dynamic torque is required ...
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Optimal topology and critical evaluation of slip synchronous permanent magnet wind generator
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: In this study the recently proposed slip-synchronous permanent magnet generator (SS-PMG), is considered as an alternative to other wind generator topologies. The SS-PMG is connected directly to the grid ...
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A vision-based South African sign language tutor
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: A sign language tutoring system capable of generating detailed context-sensitive feedback to the user is presented in this dissertation. This stands in contrast with existing sign language tutor systems, ...
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Direct piston displacement control of free-piston Stirling engines
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: Control of beta-type free-piston Stirling engines has been the topic of research and development for many years. In this dissertation, an alternative approach to free-piston Stirling engine control, ...
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Cardiac MRI segmentation with conditional random fields
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: This dissertation considers automatic segmentation of the left cardiac ventricle in short axis magnetic resonance images. The presence of papillary muscles near the endocardium border makes simple ...
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A superconducting software defined radio frontend with application to the Square Kilometre Array
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: Superconducting electronics can make the Square Kilometre Array (SKA) a better instrument. The largest radio telescope in the world will consist of several arrays, the largest of which, consisting of ...
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The effect of awareness at the medium access control layer of vehicular ad-hoc networks
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: The hidden terminal problem, coupled with high node mobility apparent in vehicular networks, present challenges to e cient communication between vehicles at the Medium Access Control (MAC) layer. Both ...
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Development and optimisation of a zinc oxide nanowire nanogenerator
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: This study developed and optimised zinc oxide (ZnO) nanowire-based nanogenerator. The nanogenerator works on the piezoelectric effect that is, a mechanical force is converted to an electrical voltage. ...
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A comparative analysis of the performance and deployment overhead of parallelized Finite Difference Time Domain (FDTD) algorithms on a selection of high performance multiprocessor computing systems
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: The parallel FDTD method as used in computational electromagnetics is implemented on a variety of different high performance computing platforms. These parallel FDTD implementations have regularly been ...
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Improving the direction-dependent gain calibration of reflector antenna radio telescopes
(Stellenbosch : Stellenbosch University, 2013-12)ENGLISH ABSTRACT: Utilising future radio interferometer arrays, such as the Square Kilometre Array (SKA), to their full potential will require calibrating for various direction- dependent effects, including the radiation ...
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A state management and persistency architecture for peer-to-peer massively multi-user virtual environments
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: Recently, there has been significant research focus on Peer-to-Peer (P2P) Massively Multi-user Virtual Environments (MMVEs). A number of architectures have been presented in the literature to implement ...
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The method of manufactured solutions for the verification of computational electromagnetic codes
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: In this work the Method of Manufactured Solutions (MMS) is introduced for the code veri cation of full-wave frequency dependent electromagnetic computational software. At rst the method is sketched ...
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Design of the dual-shaped triple layer pillbox antenna
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: The triple layer pillbox antenna is an antenna topology well suited for use as a stackable "plank" element in radar applications. Its suitability arises from the folding which makes it compact, and from ...
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