Reflections on the Use of a Smartphone to Facilitate Qualitative Research in South Africa

This paper describes conditions that led to the use of a smartphone to collect qualitative data instead of using a digital voice recorder as the standard device for recording of interviews. Through reviewing technical documents, the paper defines a smartphone and describes its applications that are useful in the research process. It further points out possible uses of other applications of a smartphone in the research process. The paper concludes that a smartphone is a valuable device to researchers

The perceptions of South African Broadcasting Corporation employees about the organisation's turn around strategy.

Organisational change, particularly turnaround strategies have always been perceived differently, and received with mixed feelings by employees. The primary aim of this research was to explore the perceptions of SABC employees about the organisation’s turnaround strategy. The study employed a qualitative research design and conducted semi-structured interviews with ten employees and four key informants from the SABC’s radio-park in Auckland Park. A thematic content analysis was used to analyse the data that was received from the participants. Employees’ perceptions that emerged from a thematic content analysis of the study were, a need to balance organisation’s needs with the needs of all employees, employees’ concerns about their job security, relationships and communication gaps between management and general employees and employees’ different and vague understanding of the turnaround strategy. The main findings of this study were, SABC employees understood and perceived the turnaround strategy to be a cost cutting mechanism by the organisation to reduce its operational costs, the participants also indicated that they did not participate in any decision making regarding the turnaround strategy. The main conclusion drawn from the study is that the SABC should have allowed its employees to fully participate in the entire process of the turnaround strategy and use the strategy as a learning opportunity for its employees

Detection and Analysis of Molten Aluminium Cleanliness Using a Pulsed Ultrasound System

This document presents the development of a solution for analysis and detection of molten metal quality deviations. The data is generated by an MV20/20, an ultrasound sensor that detects inclusions - molten metal defects that affect the quality of the product. The data is then labelled by assessing the sample using metallography. The analysis provides the sample outcome and dominant inclusion. The business objectives for the project include the real-time classification of anomalous events by means of a supervised classifier for the metal quality outcome, and a classifier for the inclusion type responsible for low quality. The adopted methodology involves descriptive, diagnostic and predictive analytics. Once the data is statistically profiled, it is standardised and scaled to unit variance in order to compensate for different units in the descriptors. Principal components analysis is applied as a dimensionality reduction technique, and it is found that the first three components account for 99.6% of the variance of the dataset. In order for the system to have predictive ability, two modelling approaches are considered, namely Response Surface Methodology and supervised machine learning. Supervised machine learning is preferred as it offers more flexibility than a polynomial approximator, and it is more accurate. Four classifiers are built, namely logistic regression, support vector machine, multi-layer perceptron and a radial basis function network. The hyperparameters are tuned using 10- fold repeated cross-validation. The multi-layer perceptron offers the best performance in all cases. For determining the quality outcome of a cast (passed or failed), all the models perform according to business targets for accuracy, precision, sensitivity and specificity. For the inclusion type classification, the multi-layer perceptron performs within 5% of the target metrics. In order to optimise the model, a grid search is performed for optimal parameter tuning. The results offer negligible improvement, which indicates that the model has reached a global maximum in the parameter optimisation in the hyperspace. It is noted that the source of variance in the inclusion type data respondent is attributed to operator error during labelling of the dataset, among several other sources of variance. It is therefore recommended that a Gage R&R be performed in order to identify sources of variation, among other improvement recommendations. From a research perspective, a vision system is recommended for assessing metal colour, texture and other visual properties in order to provide more insights. Another possible research extension recommended is the use of Fourier Transform Infrared Spectroscopy in determining signatures of the clean metal and different inclusions for detection. The project is regarded as a success, as the business metrics are met by the solution

Design of a DDP controller for autonomous autorotative landing of RW UAV following engine failure

A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Master of Science in Engineering. Johannesburg, April 2016A Rotary Wing Unmanned Aerial Vehicle (RW UAV) as a platform and its payload consisting of sophisticated sensors would be costly items. Hence, a RW UAV in the 500 kg class designed to fulfil a number of missions would represent a considerable capital outlay for any customer. Therefore, in the event of an engine failure, a means should be provided to get the craft safely back on the ground without incurring damage or causing danger to the surrounding area. The aim of the study was to design a controller for autorotative landing of a RW UAV in the event of engine failure. In order to design a controller for autorotative landing, an acceleration model was used obtained from a study by Stanford University. FLTSIM helicopter flight simulation package yielded necessary RW UAV response data for the autorotation regimes. The response data was utilized in identifying the unknown parameters in the acceleration model. A Differential Dynamic Programming (DDP) control algorithm was designed to compute the main and tail rotor collective pitch and the longitudinal and lateral cyclic pitch control inputs to safely land the craft. The results obtained were compared to the FLTSIM flight simulation response data. It was noted that the mathematical model could not accurately model the pitch dynamics. The main rotor dynamics were modelled satisfactorily and which are important in autorotation because without power from the engine, the energy in main rotor is critical in a successful execution of an autorotative landing. Stanford University designed a controller for RC helicopter, XCell Tempest, which was deemed successful. However, the DDP controller was designed for autonomous autorotative landing of RW UAV weighing 560 kg, following engine failure. The DDP controller has the ability to control the RW UAV in an autorotation landing but the study should be taken further to improve certain aspects such as the pitch dynamics and which can possibly be achieved through online parameter estimation.MT 201

'We want the bread, not the crumbs': Challenging traditional authority in the platinum belt

Members of the Bakgatla-ba-Kgafela traditional community have attempted to hold their traditional leader to account for decisions affecting the community. This article describes the interactions between some community members, traditional leaders, the state and courts, as members of the community have sought to challenge unilateral action by the traditional leader with regard to how community assets and revenue are managed and accounted for. The article examines the various actions groups and individuals have resorted to in an effort to confront traditional leadership and appeal to politicians, officials and the North West provincial government

Moral hazard as a material fact in the assessment of the risk

From text: In the context of the law of insurance, moral hazard, also referred to as moral risk (see for example Peter Havenga ‘The Financial Position of an Insured and Serious Threats of Physical Attack on Insured Property as Material Facts’ (1995) 7 SA Merc LJ 110) generally refers to the financial position of the insured. In practice, however, hazard/risk refers to the ‘serious financial difficulties’ or ‘poor financial history’ of the insured, manifested in most cases by the insured’s actual but in other cases factual insolvency. Questions which arise are whether this hazard/risk is a  material fact which should be disclosed on conclusion of a contract of insurance (or on renewal, if the contract is renewable), and whether if this is not done the insurer can avoid liability on that basis

A preliminary biochemical genetic survey of four South African painted reed frog (Hyperolius marmoratus) populations

Allozyme electrophoresis was used to evaluate genetic variability in painted reed frog (Hyperolius marmoratus) populations from the Northern Province and the Eastern Cape. Sixteen protein-encoding loci were resolved, of which seven displayed allelic polymorphism. Average heterozygosity (H) values in two permanent H. m. taeniatus populations from the Northern Province (7.9% and 6.3%) did not differ substantially from each other nor from the geographically distant Eastern Cape H. m. verrucosus (9.1%). An isolated Northern Province H. m. taeniatus population displayed more polymorphism than any other group with H=14.1%, which can probably be attributed to the periodic influx of reed frogs following dry periods. Genetic distances and gene diversity (FST) values conformed with expected values for conspecific populations. The results attained concur with the hypothesis of increased genetic heterogeneity among populations of small and relatively sedentary animals

Localised treatment and 6-month outcomes in patients with cytomegalovirus retinitis at a tertiary ophthalmology service in Ga-Rankuwa

Objective. There are few data from before the antiretroviral therapy (ART) era for cytomegalovirus retinitis (CMV-R) from settings where cost limits use of systemic treatment. This study examines CMV-R treatment and survival outcomes in a public hospital ophthalmology service in Ga-Rankuwa, South Africa.Methods. From October 2009 to October 2010, voluntarily consenting participants over the age of 15 years with incident clinically diagnosed CMV-R seen at the Dr George Mukhari Hospital ophthalmology clinic were prospectively enrolled in an observational study. Treatment was per clinicprotocols and patients were followed up with structured data collection for up to 6 months.Results. Eight individuals, all HIV infected and 50% female, were identified and enrolled. At enrolment, median age was 38 years (interquartile range (IQR) 32 - 39 years), median CD4 count 20 cells/ìl (IQR 13 - 46.5 cells/ìl),and 50% were currently receiving ART (mean duration of ART use 18 days, standard deviation (SD) 2.99 days). No participant received systemic ganciclovir, but 6 reported symptom combinations suggesting systemic CMV: shortness of breath (n=3), diarrhoea (n=3) and/or central nervoussystem complaints (n=3). Ten eyes had visual impairment less than counting fingers at enrolment. Treatment combinations were: ART plus intravitreal ganciclovir (n=5), intravitreal ganciclovir alone (n=2), and ART alone (n=1). Six-month outcomes were: death (n=1), survival (n=6), loss to follow-up (n=3), untraceable (n=1), systemic symptom resolution (4/4),visual acuity deterioration (0/5), and persisting uveitis (2/3).Conclusion. In the ART era, incident CMV-R appears to be uncommon in this setting. CMV-R may occur within the first 3 weeks after ART initiation. Even in CMV-R patients with suggestive systemic symptoms, 6-month survival is good despite no systemic CMV therapy

Secondary school teachers’ experiences of teaching pregnant learners in Limpopo province, South Africa

This paper presents the findings of a study on the experiences of secondary school teachers on teaching pregnant learners in Limpopo Province. A qualitative, exploratory, descriptive and contextual design was used. Semi-structured interviews were conducted with ten purposively selected secondary school teachers. Data analysis yielded six themes, which are: (1) identification of pregnant learners; (2) continuation of pregnant learners' school career; (3) dilemmas related to school-attending pregnant learners; (4) support of school-attending pregnant learners; (5) gender in pregnancy caretaking; and (6) communication and cooperation between teachers and parents. Teachers experienced challenges in identifying pregnant learners, and to meet their health needs as they lacked health related skills. Parents were not always cooperative towards teachers. It can be concluded that teachers face many dilemmas related to pregnant learners, and this requires a health facilitation model to enable teachers to assist pregnant learners such that they might better benefit from their schooling, and experience a positive health outcome.Key words: high risk pregnancy; learner pregnancy; school health services; teacher experiences; teenage pregnanc