Browsing Research Articles (Electrical and Electronic Engineering) by Title
Now showing items 1-20 of 48
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Animal-borne behaviour classification for sheep (Dohne Merino) and rhinoceros (Ceratotherium simum and diceros bicornis)
(BioMed Central, 2017-11-21)Background: The ability to study animal behaviour is important in many fields of science, including biology, behavioural ecology and conservation. Behavioural information is usually obtained by attaching an electronic ... -
Biosensors for the detection of Escherichia coli
(South African Water Research Commission, 2017-10)ENGLISH ABSTRACT: The supply of safe potable water, free from pathogens and chemicals, requires routine analyses and the application of several diagnostic techniques. Apart from being expensive, many of the detection methods ... -
Capacitive seat sensors for multiple occupancy detection using a low-cost setup
(IEEE -- Institute of Electrical and Electronics Engineers, 2013-02)The Minibus public transportation sector and road safety remains a significant challenge in Africa. We propose a low cost system to monitor the taxi industry and encourage safe driving. A low cost capacitive proximity ... -
Clustering acoustic segments using multi- stage agglomerative hierarchical clustering
(Public Library of Science, 2015)Agglomerative hierarchical clustering becomes infeasible when applied to large datasets due to its O(N2) storage requirements. We present a multi-stage agglomerative hierarchical clustering (MAHC) approach aimed at large ... -
Combining speed and acceleration to detect reckless driving in the informal public transport industry
(IEEE -- Institute of Electrical and Electronics Engineers, 2013-10)The informal transport industry in Sub-Saharan Africa is notoriously dangerous, leading to many fatalities annually. This paper presents an innovative way of monitoring driver behaviour, in real-time, by taking into ... -
Compact conical line power combiner design using circuit models
(Institute of Electrical and Electronics Engineers, 2014)ENGLISH ABSTRACT: A simple equivalent circuit model with empirical equations describing the peripheral feeding ports of conical line power combiners is presented. The model allows the entire structure to be designed using ... -
Compact high-power broadband absorptive filters using slotted waveguide harmonic pads
(The Institution of Engineering and Technology - IET, 2014-06)A compact high-power broadband absorptive filter is designed by cascading a slotted waveguide harmonic pad with a wide stop-band reflective filter. Absorption is achieved by coupling a surface current standing wave to ... -
A comparative evaluation of the impact of average speed enforcement (ASE) on passenger and minibus taxi vehicle drivers on the R61 in South Africa
(South African Institution of Civil Engineering, 2016)Average speed enforcement (ASE) is an emergent alternative to instantaneous speed limit enforcement to improve road safety, and is used to enforce an average speed limit over a road segment. This paper presents a study on ... -
A computationally inexpensive energy model for horizontal electric water heaters with scheduling
(2016-03)ENGLISH ABSTRACT: Electric water heaters (EWHs) remain one of the main contributors to energy consumption in countries where they are used. EWH models serve as a step towards achieving optimised control, and can also ... -
Constant radiation characteristics for log-periodic dipole array antennas
(Institute of Electrical and Electronics Engineers, 2014)Given the correct terminal voltages on each element of a log-periodic dipole array constant radiation characteristics can be achieved for an omni-directional radiation pattern. In this communication it is shown that this ... -
Detection of reckless driving in the Sub-Saharan informal public transportation system using acceleration-sensing telematics
(IEEE -- Institute of Electrical and Electronics Engineers, 2013-07)Many lives are lost annually in Sub-Saharan Africa’s unique and vibrant informal public transportation system due to accidents caused by reckless driving, fatigue, and illegal overloading. Fleet management has been used ... -
An efficient beam steerable antenna array concept for airborne applications
(Radioengineering Society, 2014)Deployment of a satellite borne, steerable antenna array with higher directivity and gain in Low Earth Orbit makes sense to reduce ground station complexity and cost, while still maintaining a reasonable link budget. The ... -
Energy perceptions in South Africa: An analysis of behaviour and understanding of electric water heaters
(Elsevier, 2016-03)Using data from an online national survey conducted in South Africa, this paper aims to investigate: the awareness of energy savings measures for electric water heaters (EWHs); whether or not consumers are implementing ... -
Etched ring absorbing waveguide filter based on a slotted waveguide antenna response
(Wiley, 2008-04)A cascade of resistively loaded etched rings in waveguide is proposed to act as the load in a balanced FMCW Reflected Power Canceller topology using a slotted waveguide array antenna. A synthesis technique using derived ... -
Fast parametric modeling of radio astronomy reflector antenna noise temperature
(Institute of Electrical and Electronics Engineers, 2016)This communication presents an approximate method to rapidly estimate the antenna noise temperature of a reflector antenna system as a function of the geometric parameters describing the reflector dishes. The initial ... -
Feature trajectory dynamic time warping for clustering of speech segments
(SpringerOpen, 2019)ENGLISH ABSTRACT: Dynamic time warping (DTW) can be used to compute the similarity between two sequences of generally differinglength. We propose a modification to DTW that performs individual and independent pairwise ... -
Household electricity and water monitor and control with cellular communications and web interface
(IEEE -- Institute of Electrical and Electronics Engineers, 2014-01)The availability and depletion of natural resources is increasingly punted as the limiting factor for sustainability. A lot of focus is currently placed on the role and effect of fossil fuels as well as water conservation. ... -
The impact of accent identification errors on speech recognition of South African English
(Academy of Science of South Africa, 2014)For successful deployment, a South African English speech recognition system must be capable of processing the prevalent accents in this variety of English. Previous work dealing with the different accents of South African ... -
Impact of Neighbor Awareness at the MAC Layer in a Vehicular Ad-hoc NETwork (VANET)
(IEEE -- Institute of Electrical and Electronics Engineers, 2013-06)Despite various proposed Medium Access Control (MAC) approaches, efficient medium access in VANET remains a significant challenge, especially for the broadcast of safety messages. A key contributing factor to packet ... -
Improved region of interest selection and colocalization analysis in three-dimensional fluorescence microscopy samples using virtual reality
(Public Library of Science, 2018)Although modern fluorescence microscopy produces detailed three-dimensional (3D) datasets, colocalization analysis and region of interest (ROI) selection is most commonly performed two-dimensionally (2D) using maximum ...
