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Automation of source-artefact classification

  • Authors: Sebokolodi, Makhuduga Lerato Lydia
  • Date: 2017
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10962/4920 , vital:20743
  • Description: The high sensitivities of modern radio telescopes will enable the detection of very faint astrophysical sources in the distant Universe. However, these high sensitivities also imply that calibration artefacts, which were below the noise for less sensitive instruments, will emerge above the noise and may limit the dynamic range capabilities of these instruments. Detecting faint emission will require detection thresholds close to the noise and this may cause some of the artefacts to be incorrectly detected as real emission. The current approach is to manually remove the artefacts, or set high detection thresholds in order to avoid them. The former will not be possible given the large quantities of data that these instruments will produce, and the latter results in very shallow and incomplete catalogues. This work uses the negative detection method developed by Serra et al. (2012) to distinguish artefacts from astrophysical emission in radio images. We also present a technique that automates the identification of sources subject to severe direction-dependent (DD) effects and thus allows them to be flagged for DD calibration. The negative detection approach is shown to provide high reliability and high completeness catalogues for simulated data, as well as a JVLA observation of the 3C147 field (Mitra et al., 2015). We also show that our technique correctly identifies sources that require DD calibration for datasets from the KAT-7, LOFAR, JVLA and GMRT instruments.
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Livelihood strategies of female-headed households in the Coloured community of Sunningdale in Harare, Zimbabwe

  • Authors: Wadi, Chenai C
  • Date: 2016
  • Language: English
  • Type: Thesis , Masters , MSocSc
  • Identifier: http://hdl.handle.net/10962/3839 , vital:20547
  • Description: The turbulent economic and political situation that has plagued Zimbabwe over the past two decades has had a dire effect on its urban population. The country’s tempestuous situation has not only threatened urbanites’ access to basic necessities but has also rendered many households and particularly female-headed households vulnerable to poverty and deprivation. Thus the primary objective of this study was to analyse and understand how coloured female-headed households in Sunningdale, Harare, Zimbabwe are surviving in the context of the current economic and political crises in the country. Essentially the study sought to achieve the three main objectives. The first objective was to identify and document the current livelihood strategies that a small sample of coloured female-headed households have adopted; the second was to explore the challenges and problems faced by female-headed households in their daily lives and lastly, the third was to establish what support mechanisms were available to these households to cope with the challenges and problems they face in generating an income and catering to their household needs. Methodologically the study employed a qualitative research approach with in-depth semi-structured interviews being used to collect data from five female-headed households. The data was then analysed using an interpretive approach and presented textually. Essentially the study found that in terms of the first research objective that coloured female-headed households engaged in a range of livelihood activities in order to earn a living, with informal trading being the main livelihood activity that the participants relied on to acquire an income to support their households. With regards to the second objective, it was revealed that the female heads interviewed faced numerous challenges ranging from economic to social problems that limited their ability to develop sustainable livelihoods, thereby increasing their risk to fall into poverty and validating their feminization of poverty. In terms of the third and last objective, the study found that the female heads did not have many reliable support mechanisms available to them thereby limiting their ability to achieve financial and social empowerment.
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E-commerce: the challenge of virtual permanent establishments

  • Authors: Adlkofer, Michelle Leigh , Venter, Michelle
  • Date: 2015
  • Subjects: Organisation for Economic Co-operation and Development , Electronic commerce , Electronic commerce -- Taxation , Double taxation -- Treaties , Globalization
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: vital:921 , http://hdl.handle.net/10962/d1020057
  • Description: The continued growth of world commerce has led to the advance of the permanent establishment principles. These principles are, however, constantly challenged by the developments of e-commerce. This thesis considers the taxing of a permanent establishment and the influence of e-commerce on the concept of a permanent establishment. In 2000, the Organisation for Economic Co-operation and Development (“OECD”) developed and introduced guidelines on how to deal with e-commerce in the context of a permanent establishment. Since the OECD guidelines on e-commerce were issued, the permanent establishment principles have come under further scrutiny. The latest development came about in 2013 with the release of the Base Erosion and Profit Shifting (“BEPS”) Action Plan. This Action Plan addresses the intention of the OECD to deal with the taxing of the digital economy. With the development of e-commerce and the result of e-commerce creating intangible boundaries between countries, the concept of a virtual permanent establishment has emerged. This has resulted in the need to tax a presence of an enterprise in a jurisdiction where no actual physical connection can be established. Various authors have made suggestions on how to ensure that an economy in which business is being carried on is correctly compensated for in the form of taxes. The source of income is the driving force for the imposition of taxation today. The main goal of this thesis was to explore the alignment of the concepts of a permanent establishment and e-commerce in the digital economy. This study therefore examined the concepts of both permanent establishments and e-commerce, and explored authors’ views and suggestions on how to deal with the inter-related effects of these two concepts. The relevant Action Points in the OECD Action Plan were also considered. , Maiden name: Venter, Michelle
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The gentle pressure of the sky

A study of the Consumption Capital Asset Pricing Model's appilcability across four countries

  • Authors: Spurway, Kayleigh Fay Nanette
  • Date: 2014
  • Subjects: Econometric models , Capital assets pricing model , Investments , Econometric models -- Germany , Econometric models -- South Africa , Econometric models -- Great Britain , Econometric models -- United States
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: vital:1095 , http://hdl.handle.net/10962/d1013016
  • Description: Historically, the Consumption Capital Asset Pricing Method (C-CAPM) has performed poorly in that estimated parameters are implausible, model restrictions are often rejected and inferences appear to be very sensitive to the choice of economic agents' preferences. In this study, we estimate and test the C-CAPM with Constant Relative Risk Aversion (CRRA) using time series data from Germany, South Africa, Britain and America during relatively short time periods with the latest available data sets. Hansen's GMM approach is applied to estimate the parameters arising from this model. In general, estimated parameters fall outside the bounds specified by Lund & Engsted (1996) and Cuthbertson & Nitzsche (2004), even though the models are not rejected by the J-test and are associated with relatively small minimum distances.
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Organisational culture and leadership competencies in ABSA Business Bank: Enterprise Business, Gauteng

  • Authors: Funani, Simphiwe Vincent
  • Date: 2014
  • Subjects: ABSA Bank Corporate culture Organizational behavior Leadership Leadership -- Ability testing Business enterprises -- Personnel management Executives -- Training of Organizational effectiveness
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:824 , http://hdl.handle.net/10962/d1011286
  • Description: From Integrative summary: This document consists of three sections namely, an evaluation report (section 1), literature review (section 2), and research methodology (section 3). The evaluation report sets out the terms of reference for the research as well as identifying the objectives of the research. It also contains a summary of the literature review section, as well as a research methodology section summary. The literature review section contains a detailed review of the literature used in this study. This section sets out by reviewing existing literature on the topic of leadership, discussing the key elements of organisational culture and includes a short discussion on the typologies of culture. The Competing Values Framework as an organisational culture typology is discussed in greater detail, since it forms the foundation upon which the measurement and data collection tools for this research are founded. The research methodology section explains the research methodology and design employed in this study. This section also addresses some of the ethical considerations for this research, as well as how the researcher addressed them. There is also a brief discussion on the limitations of the research and the application of the results. This research focused on a business unit within Absa Business Bank, named Enterprise Business Gauteng Region, with the aim of investigating the “current organisational culture” in the business unit and the leadership competencies profile of its 11 Sales Managers. This was to provide the basis and departure point for the strategic organisational culture change that the new business unit head would have wanted to effect as the business has a history of non-performance, which the new business unit head aims to change. In order to diagnose the “current organisational culture” type, an organisational culture measurement tool based on the Competing Values Framework was used. The Competing Values Framework is a four-category organisational culture typology developed by Cameron and Quinn. The framework is based on two dimensions, how stable or flexible the organisation is, and how externally or internally focused it is. This framework was also employed to establish the leadership competencies profile of Sales Managers, as observed and experienced by the frontline staff, as well as the “desired organisational culture”, as intended by the new business unit head. Through hypotheses testing, the research revealed a statistically significant difference in perceptions of culture between males and females in the business unit. The perceptions of the female frontline staff about the “current” business unit culture indicated that they find it not to be empowering and less allowing for individuality and risk taking when compared to the male staff. The research also concluded that there is no statistically significant difference between leadership competencies associated with the four categories of the Competing Values Framework in the business unit. Comparisons between the “current” and the “desired” organisational culture revealed a misalignment. The main recommendations to the new business unit head were to get the leadership competencies of the Sales Managers aligned with the “desired organisational culture” state, and drive a purposive organisational culture change effort. To support this culture change, the espoused values of the business unit would need to be aligned to the desired culture state. To address the differences in perceptions of culture between males and females the business unit head would need to be mindful of the greater need to empower women either in their current roles, or by way of promotions to senior roles.
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The Iindaba Ziyafika project: a new community of practice?

  • Authors: Nyathi, Sihle
  • Date: 2011
  • Subjects: Citizen journalism -- South Africa -- Grahamstown Journalism -- South Africa -- Grahamstown Iindaba Ziyafika project Grocott's Mail (Grahamstown, South Africa) Radio journalism -- South Africa -- Grahamstown Online journalism -- South Africa -- Grahamstown Mass media -- Social aspects -- South Africa -- Grahamstown Mass media -- Political aspects -- South Africa -- Grahamstown Journalism -- Objectivity -- South Africa -- Grahamstown
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:3477 , http://hdl.handle.net/10962/d1002932
  • Description: This study sought to investigate the practices of citizen journalists in the Iindaba Ziyafika project. The objectives of the research were to explore the evolving practices of citizen journalism in Grahamstown and to extrapolate how citizen journalists are securing a discursive space in relationship to conventional journalism. The study investigated whether the citizen journalists based at Grocotts Mail and Radio Grahamstown are developing practices and patterns that can be distinguished from the practices of conventional journalism. It also evaluated whether the content that is produced by citizen journalists differs from the content that is produced by professional journalists, so that it can be understood as "alternative" and as promoting engaged citizenship. A sub goal was also to explore whether citizen journalism does enable the practice of citizenship through expanding the public sphere. The findings of the research are that in the Iindaba Ziyafika project, citizen journalists see news as a process and not as a series of news events. This is clear departure from event-based news conceptualisation associated with mainstream journalism. They view news as unfolding social processes, allowing citizen journalists to question the factors which would have precipitated the event and investigate the causal factors of particular phenomena. The research also reveals that citizen journalists in the project are engaging in pro-am journalism. Part of the practice of citizen journalists involves a very significant amount of collaboration between professional journalists and citizen journalists. The collaboration is in the production of content and in the presentation of radio broadcasts. Part of the findings of the study are that journalists in the Iindaba Ziyafika project work in different mediums and this calls for them to acquire the competencies of the different mediums. The same citizen journalists produce content for print, radio and for online media. The diction used in the stories published by citizen journalists is couched in struggle and revolutionary language which seems to pit the community against the authorities. The citizen journalists also make use of every daily language in their radio broadcasts and borrow from their cultural expression. This they do through populist methods. The citizen journalists have also integrated communication brokering as part and parcel of their practice. This is because the citizen journalists have also made it their mandate to enable the flow of information between the residents and the local authority. In terms of sourcing there is a deliberate stance to include those who are not ordinarily given a voice in the mainstream media. Women and the poor appear frequently in stories as sources and this is a different scenario from that prevalent in mainstream journalism which frequently covers the rich and the powerful. The citizen journalists in the Iindaba Ziyafika project have also borrowed practices from professional journalism and this has been integrated into their daily practice. This includes following strategic rituals of journalism objectivity and balance.
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Namibia's long road to independence : the Botha era

  • Authors: Ruiters, Michele René
  • Date: 1992
  • Subjects: United Nations -- Namibia , Namibia -- History -- 1946-1990 , Namibia -- Politics and government -- 1946-1990
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:2754 , http://hdl.handle.net/10962/d1002001
  • Description: This thesis deals with the ten years preceding Namibia's independence in March 1990. It examines the various characters and groups in this process, and how their roles delayed or promoted it. The era of Pieter W. Botha is very significant in that his rule brought many changes to the decision-making process and content of South African foreign policy. This period, 1978 - 1989, marked the formulation of the Total National Strategy in response to the Total Onslaught being waged on South Africa by perceived hostile external forces. Namibia's transition to independence suffered under this military-oriented policy as did the rest of the region. Never before in South Africa's policy-making history had the security sector played such a major role. Regional relations changed subsequent to the policy changes because of the distorted vision the Botha regime had of black-ruled states. Namibia was seen as an important pawn in the Total National Strategy as the last buffer state in Southern Africa protecting South Africa's white minority regime
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