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A critical analysis of A2 Fast Track Lowveld sugar cane farms in Zimbabwe in global value chains: interrogating the lives of farmers and farm labourers

  • Authors: Chingono, Kudakwashe Rejoice
  • Date: 2019
  • Subjects: International trade , Sugar trade -- Zimbabwe , Sugar growing -- Zimbabwe -- Social aspects , Agriculture -- Zimbabwe -- Social aspects
  • Language: English
  • Type: text , Thesis , Masters , MSocSci
  • Identifier: http://hdl.handle.net/10962/93933 , vital:30972
  • Description: The sugar cane industry has for many years been a lucrative business with a booming global market. In Zimbabwe, the sugar cane industry is no exception, as it has been regarded as one of the most efficient in the region and even in the world. The sugar cane farms and mills in Zimbabwe are located in Triangle and Chiredzi, in the south-eastern part of the country and they are under the ownership of Tongaat Hullet and the Zimbabwean A2 farmers. The focus of this is on the A2 fast track farms in Hippo Valley, which are now owned by black farmers but as out-growers for Tongaat Hullet. The crucial question addressed in the thesis is whether the A2 sugar cane farmers and their workers, located at the production end of the sugar cane global value chain, are benefitting from their involvement in this value chain. A number of scholars argue that global value chains lead to economic and social upgrading at the production end of the chain, based on thoughts contained in modernisation and trickledown theory. There is an assumption, then, that integration into the global economy leads to economic upgrading which translates into social upgrading. In drawing upon critical global value theorists, bolstered by the Marxist perspective, considers the importance of a more critical view of global value chains in relation to the sugar cane industry in Zimbabwe, with the particular focus on A2 farms. Thus, the main objective of the thesis is to consider the lives and livelihoods of A2 sugar cane farmers and sugar cane workers through a case study, in the context of global value chains and arguments around economic and social upgrading. This is pursued through a case study of six A2 farms, which involved interviewing farmers, supervisors, and both permanent and temporary workers. The thesis concludes that there is no significant evidence of social upgrading amongst the labour force, and that the A2 farmers are in constant tension with Tongaat Hullet in seeking to engage in economic upgrading of their status as commercial farmers.
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  • Date Issued: 2019

A critical analysis of development NGO programmes in rural areas: a case study of East Cape Agricultural Research Project in South Africa

  • Authors: Sanyangore, Agnes
  • Date: 2019
  • Subjects: East Cape Agricultural Research Project , Non-governmental organization -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Agricultural development projects -- South Africa -- Eastern Cape , Land reform -- South Africa -- Eastern Cape , Land tenure -- South Africa -- Eastern Cape
  • Language: English
  • Type: text , Thesis , Masters , MSocSc
  • Identifier: http://hdl.handle.net/10962/96187 , vital:31248
  • Description: For a number of decades now, development non-governmental organisations (DNGOs) have been central to the world-wide development system which involves funding from international donors. Overall, DNGOs rely quite fundamentally on their donors for organisational sustainability, such that upward accountability to donors is inevitable. At the same time, as development agents, DNGOs are often celebrated for the deep participatory methodologies used when engaging with the beneficiaries of their programmes, leading to significant downward accountability – as least potentially. Often, for DNGOs, an awkward tension between upward and downward accountability exists. This thesis considers this tension by examining a DNGO in South Africa, namely, the East Cape Agricultural Research Project (ECARP), which focuses on questions around land redistribution. ECARP works with farm labourers and dwellers on commercial farms and small-scale farmers on redistributed farms. In the context of a broader understanding of ECARP’s mission, capacities and programmes, the thesis looks specifically at ECARP’s food security and sovereignty programme amongst small-scale farmers on redistributed farms. By drawing upon Interface theory, the thesis discusses in detail the diverse manner in which ECARP uses participatory methodologies in this particular programme. The thesis concludes that there is a reasonable degree of downward accountability in this programme, but that this does not distract from the fact that ECARP remains within the tension-riddled space marked by dual demands for accountability.
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  • Date Issued: 2019

A critical analysis of selected teachers’ perceptions and experiences of the role that visualisation processes play in their Van Hiele level 1 teaching to migrate their learners to the next Van Hiele level

  • Authors: Munichinga, Ben Muyambango
  • Date: 2019
  • Subjects: Hiele, Pierre M. van. Structure and insight , Visualization , Mathematics -- Study and teaching (Secondary) -- Namibia , Geometry -- Study and teaching (Secondary) -- Namibia , Mathematics -- Study and teaching (Secondary) -- Activity programs -- Namibia
  • Language: English
  • Type: text , Thesis , Masters , MEd
  • Identifier: http://hdl.handle.net/10962/96735 , vital:31313
  • Description: Learning is a process that involves building on prior knowledge, enriching and exchanging existing understanding where learners’ knowledge base is scaffolded in the construction of knowledge. Research on the teaching and learning of geometry in mathematics suggests that physical manipulation experiences, especially of shapes, is an important process in learning at all ages. The focus of the study was the migration of Grade 8 learners from one Van Hiele level to the next as a result of teachers incorporating visualisation processes and Van Hiele phases of instructions in their teaching. The study underpinned by the social constructivist’s theory, therefore aimed at teachers developing visual materials and using Van Hiele’s phases of instruction to teach two dimensional figures in Geometry. The study was carried out in Namibia, Zambezi region in Bukalo circuit. It involved four schools, with 93 learners and three teacher participants. The research is an interpretive case study of a planned intervention programme, which took a four weeks to complete. Participating learners wrote a Van Hiele Geometric test prior and post the intervention programme to determine their geometric level of thought. Participating teachers all received training on visualisation in mathematics and the Van Hiele theory before the intervention. During the intervention, teacher planned and each taught three lessons on two-dimensional figures. Qualitative data was collected from classroom observation, stimulus recall interviews and focus group interviews. Quantitative data came from the pre and post-test of learners. This study found that on average, Grade 8 learners who participated in the study were operating at levels lower than expected of pupils at their stage of schooling. This study also found that, visualisation processes and the Van Hiele phases are effective when used in geometry lessons to migrate learners from lower Van Hiele levels to higher. For teachers in the same circuit, partnership and planning of difficult topics on an agreed regular basis is recommended. When planning lessons teachers are encouraged to take advantage of the Van Hiele phases of instructions. This study thus recommends the incorporation of visualisation strategies of teaching geometry in particular at primary and lower secondary levels. Mathematics teachers are further encouraged to design visual materials such as Geoboards to use for every topic in geometry. Such visual materials should be carefully developed and evaluated to ensure that their use in the classroom is effectively linked to concepts under discussion in a given lesson.
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  • Date Issued: 2019

A critical analysis of South African anti-money laundering legislation regarding cryptocurrency

  • Authors: Bowden, Susan
  • Date: 2019
  • Subjects: Money laundering -- South Africa , Money -- Law and legislation -- South Africa Electronic funds transfers Money -- Technological innovations
  • Language: English
  • Type: Thesis , Masters , LLM
  • Identifier: http://hdl.handle.net/10948/42107 , vital:36626
  • Description: Cryptocurrencies are decentralised virtual currencies, using blockchain technology to process peer-to-peer electronic payments. In 2009, the first successful cryptocurrency, Bitcoin, was established. As a result of the Internet, cryptocurrencies had soon made their way into South Africa. As such, cryptocurrencies are currently not included under the definition of a legal tender and therefore remain unregulated by the legal framework. This issue is examined within this research project. The objectives were to understand the concepts of cryptocurrency, the relevance in the financial sector, the associated risks and to establish whether regulatory interference is necessary for the operation of cryptocurrency. The legal and regulatory framework of cryptocurrencies within Canada, the United States of America and the European Union were compared to that of South Africa. The research explained that cryptocurrencies are decentralised convertible currencies which are secured by cryptography. It highlighted the risks associated with cryptocurrencies, some of which are detrimental due to the wide use of cryptocurrencies. One of the risks included using cryptocurrencies to launder money. In order to mitigate these risks, jurisdictions such as Canada, the United States of America and the European Union have begun to regulate cryptocurrencies by establishing a legal framework for its operation. However, no such legal framework existed in South Africa for the regulation of cryptocurrencies. As a result, the South African Reserve Bank and National Treasury released position papers, which warn consumers of the associated risks. Therefore, the conclusion was made that regulatory intervention is necessary in South Africa. Following this, the recommendation was made to integrate cryptocurrencies into relevant existing legislation. It was recommended that regulation is the most effective method of combatting money laundering using cryptocurrencies.
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  • Date Issued: 2019

A critical analysis of the influence of media reporting on xenophobic behaviours among students in selected South African universities

  • Authors: Mgogo, Quatro
  • Date: 2019
  • Subjects: Reporters and reporting Xenophobia -- South Africa Universities and colleges -- South Africa
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10353/17495 , vital:41081
  • Description: A number of theoretical and empirically proven studies have shown that the media exert varying degree of influence on audience members. The South African media framing and coverage of foreign nationals is a good example of this. Media critics and scholars hold that the way and manner foreign nationals are represented in South African media landscape contributes to the endemic xenophobic outbreaks in the country. (Endong, 2018; George & Aidoo, 2017). This study aims to critically analyse the influence of media reporting on xenophobic behaviours among students in selected South African universities. Part of its aim is to assert if there exist xenophobic behaviours among students learning in South African universities, which are influenced by the manner in which media reports have stigmatised foreign nationals. Therefore, this study looked at three South African universities, namely the University of Fort Hare, Alice campus, the University of KwaZulu Natal, Howard college campus and the University of Johannesburg, Soweto campus. Data for the study were collected using the qualitative methods, particularly the focus groups discussions and in-depth interviews. The findings of this study have revealed that xenophobic behaviours were evident among students, in lecture-rooms, as well as student residences. The participants also confirmed that the media’s focus and reliance on negative stereotypes and generalized information when representing foreign nationals were the main contributing factors to xenophobic behaviours, including its previous adopting of the words like Amakwerekwere, Aliens and Amagrigamba. In an attempt to discourage xenophobic behaviours, this study has therefore recommended peace journalism and Ubuntu journalism as alternative models for reporting xenophobic violence and conflict.
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  • Date Issued: 2019

A critical analysis of the South African government's approach to social cohesion

  • Authors: Daniels, Lorna
  • Date: 2019
  • Subjects: Social integration , Social participation Economics -- Sociological aspects
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10948/38079 , vital:34315
  • Description: The work of scholars and government programme have in the last decade or more paid a considerable amount of attention to the issue of fostering social cohesion under conditions on the increase rate of community- level upheavals and localized conflict. While some studies critique the South African government’s social cohesion strategy of 2012 in the main, others seek to identify its measurements and develop barometers to track its progress.
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  • Date Issued: 2019

A critical assessment of the implementation of community development projects in mitigating youth unemployment: A case of Mashonaland West province Zimbabwe

  • Authors: Mafa, Dennyford
  • Date: 2019
  • Subjects: Economic development projects -- Evaluation Poverty -- Zimbabwe
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10353/17473 , vital:41079
  • Description: The aim of the study was to critically assess the implementation of community development projects in mitigating youth unemployment in Mashonaland province of Zimbabwe. The study used the mixed method which dwells beneath a social phenomenon in order to draw substantiated findings. Data was collected using three method and these include, individual face-to- face interviews, focus group discussion and questionnaire administered to youth, government officials and the local authorities. The study was underpinned by the asset based community development theory and sustainable livelihood approach. Findings highlighted that the participants and the respondents meet the characteristics and criterion for selected community development projects aimed at mitigating youth unemployment. The study revealed that there has been lack on youth involvement in the planning and initiation of the youth community development projects which aim to mitigate youth unemployment and poverty eradication. It has been found out that the implementation process of the youth community development projects was surrounded by lack of knowledge and lack of the involvement of the youths, which resulted in the failure of mitigating youth unemployment and eradication of poverty. Although accessibility (to youth) of these community development projects was for all the community youth who were unemployed, it emerged that the access was not as indicated due to factors like, lack of funding, partisan distribution of resources. The study also realized that due to lack of involvement and proper implementation, the youth community development projects were not sustainable, which was evidenced by the high rate of youth unemployment and poverty levels. Furthermore, the study revealed that effectiveness of youth community development projects in v alleviating youth unemployment in the province has also been marred with pitfalls. Thus, there has been an increase of youth unemployment and poverty. Last but not least, the findings of the study revealed that there were a couple of challenges, which are rooted in partnerships, lack of youth inclusion and involvement, as well lack of involvement of other stakeholders with expertise on implementation of youth community development projects to eradicate poverty and alleviate youth unemployment. Regardless of the brilliant ideas and strategic interventions, the government lacks the practicality of the implementation of these intervention strategies. The study found that interventions were there. However, intervention entails a process which has different facets and obligates the government to function systematically to avoid default in the process of service delivery. It is recommended amongst others that the government and various stakeholders should take cognizance and develop mechanisms and strategies for poverty alleviation, growth, development and employment creation for the youth.
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  • Date Issued: 2019

A critical realist exploration of the culture of resistance in educational technology integration practices at a South African university

  • Authors: Tshuma, Nompilo
  • Date: 2019
  • Subjects: Critical realism , Educational technology -- South Africa , Education, Higher -- Effect of technological innovations on -- South Africa , College teachers -- South Africa , College teaching -- Sociological aspects -- South Africa
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/72318 , vital:30033
  • Description: This thesis seeks to address a number of troubling concerns related to research and practice in the field of educational technology in South African higher education. Firstly, educational technology research has been criticised for a lack of theoretical rigour resulting in perspectives that are tightly focused mostly on practice but fail to adequately interrogate the socio-political complexities of integrating educational technology. Secondly, while research in the field has been criticised for failing to adequately contextualise the study of educational technology, it also fails to interrogate the impact of colonial legacies and Western-developed technologies on integration practices. Thirdly, there seems to be a disconnect between academics’ practices and choices with educational technology, and the expectations and assumptions of educational technologists. As such, this thesis predominantly follows inductive reasoning where literature and theory are applied to the empirical situation retrospectively in order to avoid the potential influences and biases of mostly Western-driven discourses on educational technology integration practices. Critical realism is used to ‘underlabour’ this study. This meta-theory asserts that there are multiple perspectives of an independent reality, and the work of research is to use these perspectives to draw closer to an understanding of that reality. As such, it allows me to interrogate my perspectives firstly, and secondly those of my research participants, about factors that constrain educational technology integration in the South African context through the use of theory (abstract concepts) and data (research participants’ multiple perspectives). However, critical realism is somewhat cautious in how to access this reality. Therefore, a critical ethnographic epistemology is employed to strengthen critical realism’s aim of accessing knowledge. A critical epistemology emphasises exposing hidden power structures, value judgements as well as self-knowledge and reflexivity. The thesis thus shows how a critical realist ontology could be complemented by a critical ethnographic methodology, particularly in critically-orientated research that has an emancipatory focus which seeks to uncover the socio-political context within which educational technology practices take place. A key argument is that critical realism can be employed as an ontological underlabourer for critical research because of: 1) its immanent critique of traditionally-accepted philosophies, 2) its emphasis on critique of our knowledge claims and value judgements, 3) its insistence that knowledge of the social world necessarily precedes emancipation, and 4) its different conceptions of power (oppressive power and transformatory power). This critical ethnographic research is conducted in a South African university with eight female academics. Data collection is in the form of interviews, observations and reflections, as well as informal and work-related interactions. At each data collection moment, I have had to be reflexively aware of my positionality as an educational technologist, the impact of a colonially-motivated methodology and an ethically-aware approach that seeks to put the needs of the research participants first. Critical ethnography’s meaning-making and critical realism’s abduction and retroduction are used to analyse and make sense of the data. In my attempt to contextualise the study’s findings, I first uncover structural forces and their impact on the academic role before attempting to correlate this with educational technology practices. The study’s findings point to two main structural forces in the socio-political context of South African higher education: the teaching/research tension and the elevation of one dominant culture. In terms of the teaching/research tension, the female academics in this study have to balance the urgent teaching function with the valued research function. They struggle to find this balance because of ambiguous messages from different structures, their passion for teaching, oppressive departmental dynamics and the pressures of their career trajectory. The elevation of one dominant culture is demonstrated through both oppressive cultural practices and untransformed curricula. The study shows that academics mitigate these structural constraints mostly through subtle every day resistance that seeks to mitigate their effect on both the academics and, where applicable, their students. Archer’s morphogenetic/morphostatic cycle is used retrospectively, in response to fieldwork, to conceptualise why this resistance comes about. A resistance framework developed using Archer is then used to understand educational technology choices and practices. The results of the research show that while academics are often pictured as resistant to technology as a response to different barriers, they actually often employ technology to resist structural forces. That is, with this thesis I show that there is a focus on resistance with technology rather than resistance to technology. The study shows how the research participants resist structural forces (teaching tension and dominant culture) by using technology to create safe and responsive learning spaces. As such, this thesis challenges educational technologists to re-think the way they support academics by recommending support strategies that acknowledge both the structural forces in the South African higher education context, as well as the culture of resistance, both of which impact academics’ educational technology choices and practices.
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  • Date Issued: 2019

A crowdsensing method for water resource monitoring in smart communities

  • Authors: Banda, Clara Mloza
  • Date: 2019
  • Subjects: Data collection platforms
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10948/42449 , vital:36658
  • Description: Crowdsensing aims to empower a large group of individuals to collect large amounts of data using their mobile devices, with the goal of sharing the collected data. Existing crowdsensing studies do not consider all the activities and methods of the crowdsensing process and the key success factors related to the process. Nor do they investigate the profile and behaviour of potential participants. The aim of this study was to design a crowdsensing method for water resource monitoring in smart communities. This study opted for an exploratory study using the Engaged Scholarship approach, which allows the study of complex real-world problems based on the different perspectives of key stakeholders. The proposed Crowdsensing Method considers the social, technical and programme design components. The study proposes a programme design for the Crowdsensing Methodwhich is crowdsensing ReferenceFrameworkthat includes Crowdsensing Processwith key success factors and guidelines that should be considered in each phase of the process. The method also uses the Theory of Planned Behaviour (TPB) to investigate citizens’intention to participate in crowdsensing for water resource monitoring and explores their attitudes, norms and perceived behavioural control on these intentions. Understanding the profiles of potential participants can assist with designing crowdsensing systems with appropriate incentive mechanisms to achieve adequate user participation and good service quality. A survey was conducted to validate the theoretical TB model in a real-world context. Regression and correlation analyses demonstrated that the attitudes, norms and perceived behavioural control can be used to predict participants’ intention to participate in crowdsensing for water resource monitoring. The survey results assisted with the development of an Incentive Mechanism as part of the Crowdsensing Method. This mechanism incorporates recruitment and incentive policies, as well as guidelines derived from the literature review and extant system analysis. The policies, called the OverSensepolicies, provide guidance for recruitment and rewarding of participants using the popular Stackelberg technique. The policies were evaluated using simulation experiments with a data set provided by the case study, the Nelson Mandela Bay Municipality. The results of the simulation experiments illustrated that the OverSenserecruitmentpolicycan reduce the computing resources required for the recruitment of participants and that the recruitment policy performs better than random or naïve recruitment policies. The proposed Crowdsensing Method was evaluated using an ecosystem of success factors for mobile-based interventions identified in the literature and the Crowdsensing Method adhered to a majority (90%) of the success factors. This study also contributes information systems design theory by proposing several sets of guidelines for crowdsensing projects and the development of crowdsensing systems. This study fulfils an identified need to study the applicability of crowdsensing for water resource monitoring and explores how a crowdsensing method can create a smart community.
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  • Date Issued: 2019

A curriculum framework for undergraduate coastal and marine tourism university programmes

  • Authors: Jonas, Lynn Cindy
  • Date: 2019
  • Subjects: Education, Higher -- Curricula , Tourism -- Study and teaching (Higher) Marine ecotourism Ecotourism -- Study and teaching (Higher) Tourism -- Environmental aspects
  • Language: English
  • Type: Thesis , Doctoral , DEd
  • Identifier: http://hdl.handle.net/10948/40006 , vital:35646
  • Description: The ocean economy has gained increasing economic significance over the past several years. Marine tourism as an economic activity has increased tremendously over the past several years. Not only does marine tourism and leisure have the ability to create employment, but there are numerous entrepreneurial opportunities in the industry. The importance of the coastal and marine tourism sector is evident and research in this sector abounds however, the issue of marine tourism education has been neglected as an area of research. A need therefore exists for the creation of ocean economy related qualifications and programmes and this study developed a curriculum framework for undergraduate coastal and marine tourism university programmes around which future Coastal and Marine Tourism (CMT) programmes could be created. The research objectives were to firstly determine the coastal and marine tourism stakeholders and role players’ perceptions and expectations of undergraduate coastal and marine tourism education and graduate competencies. The second objective was to ascertain the statutory and policy matters that shape university programmes and finally to incorporate the UNESCO-IBE curriculum framework into undergraduate coastal and marine tourism university programmes. This study fit within the pragmatic paradigm and a mixed methods research approach was utilised with a multiphase design. The data collection process was divided into three phases with Phase One collecting qualitative data through content analysis, Phase Two collecting quantitative data through a survey with questionnaire as research instrument and Phase Three collecting qualitative data through a semi-structured interview with an interview schedule as research instrument. Phase One included document analysis in order to determine the subsectors of the CMT industry, statutory and policy documents to determine programme development regulations as well as collected information regarding the socio-economic environment of the country. Phase Two collected data from industry operators and Phase Three collected data from educators and industry association representatives. The study identified four sub-sectors of the CMT industry namely Conservation Areas, Coastal and Marine Adventure Activities, Land-based Marine Tourism Attractions and Marine Resources and Recreation. All three phases of data collection were utilised to develop these four sub-sectors. The pertinent findings of Phase One indicate that the socio-economic environment in which the CMT programme would be developed is one with a slow economic growth rate, low numeracy and literacy levels with high numbers of unemployed graduates. Language policies are critical in order to accommodate English second language speakers. Furthermore, there are low levels of academics with doctoral degrees with targets to improve the status quo. Phase Two data collection notes that industry operators would prefer a programme that has strong practical and vocational focus with matters such as excursions, work-based learning and alternative teaching methods being important. These findings are supported during Phase Three data collection with educators and industry association representatives placing stronger focus on practical presentation of content and engagement with industry through site visits and demonstration of activities to students. Based on the findings in all three phases, a schematic of the CMT curriculum framework is developed and presented. Recommendations are made for the implementation of the CMT curriculum framework in order to identify omissions and to include the student voice. Stronger linkages should also be forged between industry and academia in order to facilitate the CMT programme. Further research could also test and implement the four identified sub-sectors in order to determine its suitability.
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  • Date Issued: 2019

A deep learning approach to classifying tyres using sidewall images

  • Authors: Gifford, Dean
  • Date: 2019
  • Subjects: Image processing -- Digital techniques , Image processing Computer science
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10948/39720 , vital:35351
  • Description: End of Life Tyres (ELT's) pose a potential health and environmental risk when dumped in illegal stockpiles. For recycling to be considered feasible, a profitable business opportunity needs to be created. One method of making the recycling process of tyres more profitable is by understanding the compounds found within each tyre. This study aims at classifying these tyres in order to achieve this knowledge. A literature review was done to investigate neural networks, convolutional neural networks as well as existing deep learning architectures for image classification. A deep learning approach was applied in order to classify the logos of tyres as these approaches have proved their success in both image classification and more specifically logo classification. Although tyre classification has been implemented in the past, a deep learning approach has not been applied and the logo has not been the classifying element in any other studies. The main difference of this study compared to previous research surrounding deep learning and logo classification is the properties of the tyre logo. Logos on tyres are very similar in colour as they are purely formed in rubber and very seldom have any colour to them. Additionally, the embossed logos can contain variation among same branded tyres due to small inconsistencies in the moulds. The implementation of this deep learning solution saw multiple convolutional neural networks implemented. Some of these architectures were also implemented using transferred learning. The metrics obtained as outputs from training and testing the architectures were the accuracy, precision, recall, and F1-score. These metrics were compared in conjunction with the confusion matrix produced from testing. To ensure that variance was accounted for in the experiments, the k-fold cross-validation technique was adopted. The results of this study identified that one convolutional neural network model, MobileNet, was particularly well suited for the context of classifying logos on tyre sidewalls. The MobileNet architecture had the highest performance metrics for both training from scratch (96.7% accuracy) and transferred learning (98.8% accuracy). Three other models performed particularly well when trained from scratch, these were a modification of the LeNet architecture, ResNet50 and InceptionV3. The transferred learning results were also impressive with four out of the 5 models achieving an accuracy above 94%. Interestingly, the ResNet50 architecture failed to train when transferred learning was applied. Contrasting to this, the two models VGG16 and VGG19 failed to train when trained from scratch but performed equally as well as the other models when transferred learning was implemented. This indicates that although transferred learning can improve the performance of models, it is highly dependent on the task as well as the model. Overall the results obtained proved that a deep learning approach could be applied in order to classify tyres accurately.
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  • Date Issued: 2019

A design experiment exploring the influence of visual and kinesthetic tools in learning Grade 8 linear algebra in a Namibian secondary school

  • Authors: Kalua, Enos
  • Date: 2019
  • Subjects: Algebra -- Study and teaching (Secondary)-- Namibia , Mathematics -- Study and teaching (Secondary)-- Namibia , Information visualization , Visual learning -- Case studies
  • Language: English
  • Type: text , Thesis , Masters , MEd
  • Identifier: http://hdl.handle.net/10962/92683 , vital:30724
  • Description: Based on a broad literature review, understanding algebra is a challenge among learners in middle schools around the world. Early researches also indicated that algebra is often taught through inherent symbols and procedures. This does not exclude Namibian learners in secondary schools whom I have worked with for over 10 years. Examination reports (2014, 2016 and 2017) serve as evidence that learners performed poorly (below 45%) in the area of algebra, with these reports indicating that teachers need to strongly emphasise the issue of solving linear equations. Therefore, this study presents a proposed design research in an attempt to help learners develop meaningful understanding of linear algebra at Grade 8 level. Eight learners whose ages ranged from 13 - 14 years from one Namibian secondary school in Oshikoto region, in northern Namibia, were the participants in this study. The learners represented different groups of learning abilities, ranging from low learning abilities to high learning abilities. The designed programme for this intervention consisting of eight lessons was planned for three weeks and the lessons were conducted in the afternoon to avoid any interruption with normal learning hours. The study used four tools for data collection, namely, benchmark tests (pre-test and post-test), observation, focus groups and unstructured interviews. The data collected for this study was inductively analysed. The purpose of this study was to determine whether and how the specific visual and kinaesthetic teaching tools (diagrams, expansion box and balance method) used may have contributed to learners’ understanding of algebraic concepts and techniques (variables, expressions and equations). The study used diagrams (geometrical plane shapes) for separating terms, an expansion box for expanding brackets and the balance method for solving linear equations. The study revealed the use of diagrams helped the learners in understanding the separation of variable and constant terms when simplifying expressions through addition and/or subtraction. Moreover, the study also revealed that the use of an expansion box was useful for the learners in understanding expansion of brackets in expressions with more than one term. Regarding the use of the balance method, the study showed that learners were already able to solve linear equations by the transfer method, hence, the balance method was not necessary.
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  • Date Issued: 2019

A development method for deriving reusable concurrent programs from verified CSP models

  • Authors: Dibley, James
  • Date: 2019
  • Subjects: CSP (Computer program language) , Sequential processing (Computer science) , Go (Computer program language) , CSPIDER (Open source tool)
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/72329 , vital:30035
  • Description: This work proposes and demonstrates a novel method for software development that applies formal verification techniques to the design and implementation of concurrent programs. This method is supported by a new software tool, CSPIDER, which translates machine-readable Communicating Sequential Processes (CSP) models into encapsulated, reusable components coded in the Go programming language. In relation to existing CSP implementation techniques, this work is only the second to implement a translator and it provides original support for some CSP language constructs and modelling approaches. The method is evaluated through three case studies: a concurrent sorting array, a trialdivision prime number generator, and a component node for the Ricart-Agrawala distributed mutual exclusion algorithm. Each of these case studies presents the formal verification of safety and functional requirements through CSP model-checking, and it is shown that CSPIDER is capable of generating reusable implementations from each model. The Ricart-Agrawala case study demonstrates the application of the method to the design of a protocol component. This method maintains full compatibility with the primary CSP verification tool. Applying the CSPIDER tool requires minimal commitment to an explicitly defined modelling style and a very small set of pre-translation annotations, but all of these measures can be instated prior to verification. The Go code that CSPIDER produces requires no intervention before it may be used as a component within a larger development. The translator provides a traceable, structured implementation of the CSP model, automatically deriving formal parameters and a channel-based client interface from its interpretation of the CSP model. Each case study demonstrates the use of the translated component within a simple test development.
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  • Date Issued: 2019

A dynamics based analysis of allosteric modulation in heat shock proteins

  • Authors: Penkler, David Lawrence
  • Date: 2019
  • Subjects: Heat shock proteins , Molecular chaperones , Allosteric regulation , Homeostasis , Protein kinases , Transcription factors , Adenosine triphosphatase , Cancer -- Chemotherapy , Molecular dynamics , High throughput screening (Drug development)
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/115948 , vital:34273
  • Description: The 70 kDa and 90 kDa heat shock proteins (Hsp70 and Hsp90) are molecular chaperones that play central roles in maintaining cellular homeostasis in all organisms of life with the exception of archaea. In addition to their general chaperone function in protein quality control, Hsp70 and Hsp90 cooperate in the regulation and activity of some 200 known natively folded protein clients which include protein kinases, transcription factors and receptors, many of which are implicated as key regulators of essential signal transduction pathways. Both chaperones are considered to be large multi-domain proteins that rely on ATPase activity and co-chaperone interactions to regulate their conformational cycles for peptide binding and release. The unique positioning of Hsp90 at the crossroads of several fundamental cellular pathways coupled with its known association with diverse oncogenic peptide clients has brought the molecular chaperone under increasing interest as a potential anti-cancer target that is crucially implicated with all eight hallmarks of the disease. Current orthosteric drug discovery efforts aimed at the inhibition of the ATPase domain of Hsp90 have been limited due to high levels of associated toxicity. In an effort to circumnavigate this, the combined focus of research efforts is shifting toward alternative approaches such as interference with co-chaperone binding and the allosteric inhibition/activation of the molecular chaperone. The overriding aim of this thesis was to demonstrate how the computational technique of Perturbation response scanning (PRS) coupled with all-atom molecular dynamics simulations (MD) and dynamic residue interaction network (DRN) analysis can be used as a viable strategy to efficiently scan and accurately identify allosteric control element capable of modulating the functional dynamics of a protein. In pursuit of this goal, this thesis also contributes to the current understanding of the nucleotide dependent allosteric mechanisms at play in cellular functionality of both Hsp70 and Hsp90. All-atom MD simulations of E. coli DnaK provided evidence of nucleotide driven modulation of conformational dynamics in both the catalytically active and inactive states. PRS analysis employed on these trajectories demonstrated sensitivity toward bound nucleotide and peptide substrate, and provided evidence of a putative allosterically active intermediate state between the ATPase active and inactive conformational states. Simultaneous binding of ATP and peptide substrate was found to allosterically prime the chaperone for interstate conversion regardless of the transition direction. Detailed analysis of these allosterically primed states revealed select residue sites capable of selecting a coordinate shift towards the opposite conformational state. In an effort to validate these results, the predicted allosteric hot spot sites were cross-validated with known experimental works and found to overlap with functional sites implicated in allosteric signal propagation and ATPase activation in Hsp70. This study presented for the first time, the application of PRS as a suitable diagnostic tool for the elucidation and quantification of the allosteric potential of select residues to effect functionally relevant global conformational rearrangements. The PRS methodology described in this study was packaged within the Python programming environment in the MD-TASK software suite for command-line ease of use and made freely available. Homology modelling techniques were used to address the lack of experimental structural data for the human cytosolic isoform of Hsp90 and for the first time provided accurate full-length structural models of human Hsp90α in fully-closed and partially-open conformations. Long-range all-atom MD simulations of these structures revealed nucleotide driven modulation of conformational dynamics in Hsp90. Subsequent DRN and PRS analysis of these MD trajectories allowed for the quantification and elucidation of nucleotide driven allosteric modulation in the molecular chaperone. A detailed PRS analysis revealed allosteric inter-domain coupling between the extreme terminals of the chaperone in response to external force perturbations at either domain. Furthermore PRS also identified several individual residue sites that are capable of selecting conformational rearrangements towards functionally relevant states which may be considered to be putative allosteric target sites for future drug discovery efforts Molecular docking techniques were employed to investigate the modulation of conformational dynamics of human Hsp90α in response to ligand binding interactions at two identified allosteric sites at the C-terminal. High throughput screening of a small library of natural compounds indigenous to South Africa revealed three hit compounds at these sites: Cephalostatin 17, 20(29)-Lupene-3β isoferulate and 3'-Bromorubrolide F. All-atom MD simulations on these protein-ligand complexes coupled with DRN analysis and several advanced trajectory based analysis techniques provided evidence of selective allosteric modulation of Hsp90α conformational dynamics in response to the identity and location of the bound ligands. Ligands bound at the four-helix bundle presented as putative allosteric inhibitors of Hsp90α, driving conformational dynamics in favour of dimer opening and possibly dimer separation. Meanwhile, ligand interactions at an adjacent sub-pocket located near the interface between the middle and C-terminal domains demonstrated allosteric activation of the chaperone, modulating conformational dynamics in favour of the fully-closed catalytically active conformational state. Taken together, the data presented in this thesis contributes to the understanding of allosteric modulation of conformational dynamics in Hsp70 and Hsp90, and provides a suitable platform for future biochemical and drug discovery studies. Furthermore, the molecular docking and computational identification of allosteric compounds with suitable binding affinity for allosteric sites at the CTD of human Hsp90α provide for the first time “proof-of-principle” for the use of PRS in conjunction with MD simulations and DRN analysis as a suitable method for the rapid identification of allosteric sites in proteins that can be probed by small molecule interaction. The data presented in this section could pave the way for future allosteric drug discovery studies for the treatment of Hsp90 associated pathologies.
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  • Date Issued: 2019

A Financial Sustainability Model for the South African Local Government

  • Authors: Mhlanga, Shepherd
  • Date: 2019
  • Subjects: Local government -- South Africa -- Eastern Cape -- Finance Municipal finance -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Doctoral , D.Admin
  • Identifier: http://hdl.handle.net/10353/13715 , vital:39699
  • Description: Local government financial sustainability leverages a local municipality’s capabilities to conceptualize and implement an array of its developmental programmes. This thesis evaluates the state of the initiatives for bolstering financial sustainability in the increasingly complex contemporary South African local government sphere. The motive of the study was to identify major paradoxes and a local government financial sustainability model that could be extracted and suggested for mitigating such constraints. Using a meta-synthesis as a principal technique in content analysis, findings revealed that major determinants of local government financial sustainability are often linked to the application of the four-step’s processes in strategic cyclical financial sustainability framework and three foundational constructs for financial sustainability management. The four-step’s processes in strategic cyclical financial sustainability framework were found to aid environmental analysis, identification of the sources of revenues and revenue generation, managing the utilization of the generated revenues and monitoring and evaluation. As it emerged from the findings, these positive effects of strategic cyclical financial sustainability framework are often illuminated by three foundational constructs for financial sustainability that leverage financial risk management, governance and leadership. However, in lieu of the application of relevant mitigating strategies, it also emerged from the analysis of the findings that initiatives that bolster financial sustainability may still be constrained by poor analysis and identification of the level of financial sustainability maturity. Other paradoxes were found to be linked to lack of suitable government financing models, poor strategic financial planning and budgeting as well as lack of effective models for managing equity. However, even in the midst of such paradoxes, findings still indicated that the concept of financial sustainability is a notion which is increasingly being emphasized by the South African local government sphere. To leverage municipal financial sustainability, most municipalities were found to use financial sustainability models and methods such as central financial grant system, SALGA’s model for financial sustainability, investment in revenue-generating activities and managing municipal operational efficiency as a driver of cost 4 | P a g e minimisation. However, despite such significant strides, findings still revealed that even with various socio-economic initiatives undertaken to leverage financial sustainability of the South African local government, the state of financial sustainability in the South African local government sphere seems to be at risk as viewed from such issues as compliance, systematic and strategic levels. As it emerged from the findings, this is attributable to the fact that most initiatives for improving financial sustainability in the South African local government are often still constrained by inadequate municipal capacity, limited income-generating activities, deficient local government procurement system and poor leadership and governance. Such findings seem consonant with theoretical findings that signified the major paradoxes of financial sustainability in the contemporary public sector organisations are often associated with poor analysis and identification of the level of financial sustainability maturity, lack of suitable government financing models, poor strategic financial planning and budgeting and lack of effective models for managing equity. Drawing from these findings, it is argued it is critical that the Department of Local Government adopts and applies the local government financial sustainability model akin to the conceptual model suggested in Figure 1. The application of such a model would require integration and use of the four main pillars (strategic financial planning, income diversification, sound financial administration and management, and own income generation) for local government financial sustainability, three foundational constructs (financial risk management, financial governance and financial ethical leadership) for local government financial sustainability, and three foundational nonfinancial constructs (political stability, fiscal and economic stability, forecasting and sensing to mitigate the devastating negative effects of natural calamities and disaster) for local government financial sustainability. It was further argued that all these must be accompanied by measurement of the overall maturity of the financial sustainability of the local municipality using four perspectives (liquidity, resilience, service and fiscal responsibility and public confidence) of local government financial sustainability in conjunction with the five spectrums (at risk, compliance-based, incremental, strategic and systematic) of local government financial sustainability.
  • Full Text:
  • Date Issued: 2019

A framework for capital structure decision-making in South African businesses

  • Authors: Du Toit, Jan Lodewicus
  • Date: 2019
  • Subjects: Corporations -- Finance -- South Africa , Business enterprises -- South Africa Decision making
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: http://hdl.handle.net/10948/39567 , vital:35291
  • Description: The research is undertaken to understand how businesses make their capital structure decisions by identifying and evaluating the factors to be considered in making capital structure decisions in South African businesses. Qualitative research methods are used in two phases. In phase one, a literature review is conducted to create a framework of strategic aspects to consider when making capital structure decisions. In phase two the framework is evaluated by conducting in-depth interviews. The purpose of phase two is to identify the strategic aspects that are considered in the South African business context. The literature overview identified twelve strategic aspects for consideration when making capital structure decisions, namely business risk, control, flexibility, growth rate, long-run viability, management constraints, management conservatism, market conditions, rating agencies, size, taxation and transactional cost. The framework of twelve strategic aspects to be considered when making capital structure decisions was empirically evaluated by means of interviews. The interview responses regarding the initial twelve strategic aspects were coded and three themes emerged, namely critical strategic decision-making factors (business risk, financial flexibility, tax advantage, and volatility of earnings cash flows); factors relating specifically to markets in South Africa (growth rate, long-term viability, market conditions, credit rating, and transaction costs) and autonomy of the decision-making process (control, management constraints, managerial conservatism, and size). During the interview process, it was indicated that the autonomy of the decision-making process theme (control structure, management constraints, managerial conservatism and business size) do not form part of the strategic capital structure decision-making process in their companies and should be omitted. The interviewees highlighted four additional themes that may affect their capital structure decisions, namely government interference in the market and in the local business; Black Economic Empowerment (BEE) rating; political stability, and state capture. The study suggests a proposed framework consisting of six themes that can be used to guide capital structure decisions in South Africa businesses.
  • Full Text:
  • Date Issued: 2019

A framework for ethical sourcing of construction materials

  • Authors: Ibrahim, Kabir
  • Date: 2019
  • Subjects: Construction industry -- Environmental aspects -- Nigeria , Building materials -- Environmental aspects -- Nigeria Building -- Environmental aspects -- Nigeria Environmental protection -- Nigeria Conservation of natural resources -- Nigeria
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: http://hdl.handle.net/10948/42140 , vital:36629
  • Description: Climate change and a speedily depreciating ecosystem are global challenges. These challenges are, in the main, attributed to activities in the construction industry, which relies heavily on the environment to provide materials. Studies show that the impact in developing countries is worse, due to the low level of awareness. Consequently, there is a dearth of research-based evidence on the ethics of sourcing of materials. This research aimed at changing that by investigating the ethics of materials sourcing in Nigeria. Epistemologically, the research is subjective and paradigmatically phenomenological. The methods used for data collection include a comprehensive literature review, collection of archival records, empirical studies of sixteen organisations that are involved in materials sourcing, transportation and production of eight construction materials across the six geo-political zones in Nigeria, that were purposefully selected. The findings reveal that the majority of the processes employed to source, transport and produce materials for the construction industry are not ethical environmentally due to their contribution to air pollution, water pollution, noise pollution and vibration, landscape damage, harm to flora and fauna and waste production. Furthermore, the study found that the majority of the organisations studied, do not produce sustainability reports for their operations. The study developed a framework for ethical sourcing of construction materials. The study recommends that organisations should utilise the framework developed in this study to enhance their sustainability practices.
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  • Date Issued: 2019

A framework for scoring and tagging NetFlow data

  • Authors: Sweeney, Michael John
  • Date: 2019
  • Subjects: NetFlow , Big data , High performance computing , Event processing (Computer science)
  • Language: English
  • Type: text , Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10962/65022 , vital:28654
  • Description: With the increase in link speeds and the growth of the Internet, the volume of NetFlow data generated has increased significantly over time and processing these volumes has become a challenge, more specifically a Big Data challenge. With the advent of technologies and architectures designed to handle Big Data volumes, researchers have investigated their application to the processing of NetFlow data. This work builds on prior work wherein a scoring methodology was proposed for identifying anomalies in NetFlow by proposing and implementing a system that allows for automatic, real-time scoring through the adoption of Big Data stream processing architectures. The first part of the research looks at the means of event detection using the scoring approach and implementing as a number of individual, standalone components, each responsible for detecting and scoring a single type of flow trait. The second part is the implementation of these scoring components in a framework, named Themis1, capable of handling high volumes of data with low latency processing times. This was tackled using tools, technologies and architectural elements from the world of Big Data stream processing. The performance of the framework on the stream processing architecture was shown to demonstrate good flow throughput at low processing latencies on a single low end host. The successful demonstration of the framework on a single host opens the way to leverage the scaling capabilities afforded by the architectures and technologies used. This gives weight to the possibility of using this framework for real time threat detection using NetFlow data from larger networked environments.
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  • Date Issued: 2019

A framework for the adoption and optimization of technology within Coega Business Center

  • Authors: Zulu, Zwelibanzi
  • Date: 2019
  • Subjects: Technological innovations
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: http://hdl.handle.net/10948/40206 , vital:35982
  • Description: The special economic zone sector plays an important role in economies across the African continent. The mission of the COEGA Development Corporation (CDC) is to provide a competitive investment location supported by value added business services that ultimately enable socio-economic development. The Entity is mandated to develop and operate the Coega Industrial Development Zone (IDZ), which is located adjacent to the modern deep-water port facility, Port of Ngqura, developed and owned by Transnet National Ports Authority. The CDC attracts investors from all over the world and in different business sectors through investment promotion as well as Foreign Direct Investment (FDI). The Coega Development Corporation whose core mandate is to attract Foreign Direct Investments (FDI) struggles to adopt innovative information technologies expeditiously, which is problem for the organization. The organization currently has Information Technology (IT) systems and applications such as the Enterprise Resource Planning (ERP) and other IT systems that have been used, but there has been failure in maximizing the IT capabilities implemented internally. Employees are not understanding and seeing the benefit of using IT systems and there is no integration of systems within the CDC. This paper aims to acquire underlying knowledge of how IT is adopted in private sector organizations and further explore what factors impact its adoption. The main objective of this study was to propose a framework for adopting an optimizing technology usage within the Coega development Corporation to enhance productivity and efficiency. The study focused on the effect of components such as top management involvement, management styles, innovative organization culture, end user training, innovation diffusion, championship and knowledge management. In conclusion, this study showed the importance of optimizing technology, within the Coega Business Center. The author presented and made Recommendations on how to integrate the independent variables identified can influence the optimization of technology. v The proposed conceptual IT innovation adoption and optimization framework is a contribution to theory. This framework presents a detailed list of internal factors that influence IT adoption and optimization in government sector organizations such as the Coega Development Corporation. The author inferences that each factor within this framework signifies its importance and must be considered by organizations while adopting innovation technologies.
  • Full Text:
  • Date Issued: 2019

A framework of macroeconomic factors to be considered when evaluating commercial real estate development in sub-Saharan Africa

  • Authors: Lawson, Stephen
  • Date: 2019
  • Subjects: Commercial real estate -- Development -- Sub-Saharan Africa , Real estate investment -- Sub-Saharan Africa Macroeconomics
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: http://hdl.handle.net/10948/40072 , vital:35745
  • Description: Sub-Saharan Africa as a region is one with great potential given the positive demographic trends experienced in recent history, trends expected to continue into the future. The factors contributing to this positive demographic trend include, improved healthcare, education and life expectancy, all of which have contributed to a younger and growing population. The younger and growing population, the majority of which are located within the working age group, have resulted in high rates of urbanisation as the populous move from traditional rural areas to more urbanised areas and cities in search of greater opportunities, employment, and ultimately, better quality of life. The positive population growth and urbanisation trends exhibited in the region provide an opportunity to the role players in industry and commerce, as they seek to take advantage of the growing consumer base. Accordingly, commercial real estate developers active within the region have an opportunity to satisfy the growing needs of the market given the low levels of commercial real estate stock available in the region. However, historically the region has served as a poor investment destination for commercial real estate given the dynamic and occasionally volatile political, economic and legal environments. The opportunity presented to commercial real estate developers as a result of the positive demographic trends is met with large scale risks in the form of a dynamic and ever-changing macroeconomic environment within the region. To ensure the success, profitability and longevity of their commercial real estate developments, active real estate developers and in pursuit of commercial real estate development in sub-Saharan Africa need to approach the opportunities in a cautious and informed manner. The purpose of the study is to develop a framework which will identify a common set of macroeconomic factors and associated variables in order to assist South African real estate developers in the identification, mitigation and management of macroeconomic risks when evaluating commercial real estate in sub- Saharan Africa. A frame of reference was developed on the PESTEL Analysis in order to identify factors within the macroeconomic environment, following which a literature-driven framework was developed after an extensive literature review process, which identified macroeconomic risk variables associated with each of the factors identified. The literature-driven framework was then tested through a series of semi-structured interviews, which comprised five suitably qualified and experienced respondents who are real estate developers currently active in pursuit of commercial real estate development in sub-Saharan Africa and are currently employed by or own a real estate development organisation. Following the data analysis of the respondent interviews, a proposed framework was developed which detailed the macroeconomic factors and associated variables to be considered when evaluating commercial real estate development in sub-Saharan Africa, by providing a ranked scale of relevance for the variables associated with the respective macroeconomic risk factors identified. The development of the proposed framework is intended to assist South African real estate developers in the identification, mitigation and management of macroeconomic risks when evaluating the development of commercial real estate in sub-Saharan Africa.
  • Full Text:
  • Date Issued: 2019
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