Browsing by Issue Date
Now showing items 1-20 of 25
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Wideband modelling and parameter estimation of capacitor voltage transformers using a pseudo-random impulse sequence
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Capacitor voltage transformers are widely used on power transmission networks for voltages of 275 kV and above for voltage measurement, installed on high voltage busbars and transmission lines. The ... -
Wave front simulator for closed loop testing of direction finding systems
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Direction finding systems are highly complex and intricate. The direction finding antenna arrays are expensive and sometimes physically large (more than 125 m is some arrays). When these systems are ... -
Tuneable VHF and UHF notch filters for protection against jamming
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: A novel narrow-band helical resonator stop-band filter, with PIN-diode based switched frequency states, is presented for the first time. The use of PIN- diodes offers a very low-loss discrete tuning ... -
Solving sparse-reward problems in partially observable 3D environments using distributed reinforcement learning
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: n this study, we address sparse-reward problems in partially observable 3D environments. The example task is set in a simulation environment where a reinforcement learning (RL) agent has to deliver a ... -
Robust voice activity detection for low-resource automatic speech recognition
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: The automatic separation of raw audio into speech and non-speech is an important preprocessing step for many real-world speech processing systems. This task, known as voice activity detection (VAD), has ... -
The research and development of a capacitive biosensor to detect and measure Arg Gingipain A
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Alzheimer’s disease, Parkinson’s disease and Periodontitis are non-communicable diseases with devastating consequences for the patients and people caring for the patients. It has been found that inflammation ... -
Reconfigurable microstrip filter with continuous coupling and frequency tunability
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: For the modern communication system, adaptability is an essential requirement to remain relevant in the current day and age. This project focuses on the implementation of a varactor structure to provide ... -
Nomad: a pithos based P2P distributed storage network implementation
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Massively multi-user virtual environments (MMVEs) can be defined as virtual environments where thousands of users are able to simultaneously interact with one another or with a virtual world. A popular ... -
Multi-agent path finding with reinforcement learning
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Navigation systems are becoming larger, with the need to find solutions in real time. Search based approaches are normally used to find collision free paths for a group of agents. These centralised ... -
Model based fault detection and isolation approach for actuator and sensor faults in a UAV
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: This thesis presents the design and validation of model-based fault detection and isolation (FDI) approach for unmanned aerial vehicles (UAV). In safety-critical sys- tems such as chemical, nuclear ... -
Mitochondrial fission, fusion and depolarisation event location prediction for a high-throughput analysis of three-dimensional fluorescence microscopy images
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Cells are the basic building blocks of all living organisms and the overall health and quality of life are closely linked to their health and functioning. Amongst others, morphological mitochondrial ... -
An investigation into the imager pointing accuracy and stability for a CubeSat Using a CubeADCS in sun-synchronous low earth orbits
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: The past decade has seen a rapid increase in investment and interest into the CubeSatellite industry, with a particular rise in interest seen from the commercial sector. The demand for miniaturised ... -
Investigating surge protection and earthing designs used for utility-scale PV plants
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Due to the global impact of fossil fuel energy generation, renewable energy source imple- mentation is growing. Solar photovoltaic (PV) energy generation has seen the second-highest growth of all renewable ... -
Improving unsupervised acoustic word embeddings using segment- and frame-level information
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Many speech processing tasks involve measuring the acoustic similarity between speech segments. Conventionally, these speech comparisons are performed using dynamic time warping (DTW), a computationally ... -
Fabrication of an affordable organic electrochemical transistor for the detection of apolipoprotein A1
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Cardiovascular diseases are responsible for up to 31% of all deaths internationally. For optimal treatment, cardiac health biomarkers, such as cholesterol, need to be measured regularly. However, for ... -
Discriminating coughs in a Mmulti-bed ward environment
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Automatic cough detection algorithms play a key role in cough monitoring systems. These systems assess a patient’s recovery by monitoring the frequency and other characteristics of their coughs during ... -
Differential LNA for SKA Mid-frequency aperture array
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: The sensistivity of a receiver is determined by the total collecting area of the radio system and the noise temperature of the system. To maximize the sensitivity, the collecting area needs to be made ... -
Development of a sensor for the early detection of pancreatic ductal carcinoma
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Cancer has always been a serious problem in the medical field. Certain types of cancer such as pancreatic cancer, has a very low survival rate. One of the reasons for this is because it is typically ... -
Development of a local hot-cold antenna measurement system
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: Active antennas and antenna arrays are of great interest for high-sensitivity receiver systems, as used in radio astronomy. Several topologies for such receiver systems have low noise amplifiers closely ... -
Design and simulation of a flux-locked-loop for use in low-frequency magnetometry systems using DC SQUIDS
(Stellenbosch : Stellenbosch University, 2021-12)ENGLISH ABSTRACT: his thesis presents the design of a Flux-Locked-Loop (FLL) for use in readout electronics for High Temperature Superconductor Superconducting Quantum Interference Devices (HTS SQUIDs). SQUIDs are used ...
