A detailed investigation of interoperability for web services
- Authors: Wright, Madeleine
- Date: 2006
- Subjects: Firefox , Web services , World Wide Web , Computer architecture , C# (Computer program language) , PHP (Computer program language) , Java (Computer program language)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4592 , http://hdl.handle.net/10962/d1004832 , Firefox , Web services , World Wide Web , Computer architecture , C# (Computer program language) , PHP (Computer program language) , Java (Computer program language)
- Description: The thesis presents a qualitative survey of web services' interoperability, offering a snapshot of development and trends at the end of 2005. It starts by examining the beginnings of web services in earlier distributed computing and middleware technologies, determining the distance from these approaches evident in current web-services architectures. It establishes a working definition of web services, examining the protocols that now seek to define it and the extent to which they contribute to its most crucial feature, interoperability. The thesis then considers the REST approach to web services as being in a class of its own, concluding that this approach to interoperable distributed computing is not only the simplest but also the most interoperable. It looks briefly at interoperability issues raised by technologies in the wider arena of Service Oriented Architecture. The chapter on protocols is complemented by a chapter that validates the qualitative findings by examining web services in practice. These have been implemented by a variety of toolkits and on different platforms. Included in the study is a preliminary examination of JAX-WS, the replacement for JAX-RPC, which is still under development. Although the main language of implementation is Java, the study includes services in C# and PHP and one implementation of a client using a Firefox extension. The study concludes that different forms of web service may co-exist with earlier middleware technologies. While remaining aware that there are still pitfalls that might yet derail the movement towards greater interoperability, the conclusion sounds an optimistic note that recent cooperation between different vendors may yet result in a solution that achieves interoperability through core web-service standards.
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- Date Issued: 2006
A field investigation of physical workloads imposed on harvesters in South African forestry
- Authors: Christie, Candice Jo-Anne
- Date: 2006
- Subjects: Forests and forestry -- South Africa Employees -- Workload Forest products industry -- South Africa Work -- Physiological aspects Heart rate monitoring Foresters -- South Africa -- Workload Oxygen -- Physiological transport
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5122 , http://hdl.handle.net/10962/d1005200
- Description: The focus of this field investigation was an analysis of the work demands being placed on South African forestry workers, in particular Chainsaw Operators and Stackers. Working postures, physiological and perceptual responses were assessed on a sample of 58 workers (29 Chainsaw Operators and 29 Stackers) during a ‘normal’ working shift. Body mass was measured before and after work in order to determine dehydration levels. Polar heart rate monitors were fitted to six workers each day over a period of two weeks in order to record ‘working’ heart rates. Fluid and food intake was monitored and recorded during this initial data collection phase. The Rating of Perceived Exertion and Body Discomfort Scales were explained in Zulu, their native language, and workers were asked to rate their perceptions of effort at regular intervals during work, while areas and intensity of body discomfort was obtained on completion of work. After completing a work shift, a 30 minute ‘recovery’ period was given, thereafter a portable ergospirometer, the k4b², was attached to the worker who then participated in a progressive, submaximal step test for the purpose of establishing individual, and group, heart rate-oxygen uptake (HR/VO[subscript 2]) regressions for predicting oxygen uptake from ‘working’ heart rate responses. These procedures were repeated four weeks later following the introduction of a fluid and nutritional supplement during work which was delivered to the workers while they were executing their tasks. The results revealed awkward working postures with a predominance of trunk flexion during all the harvesting tasks; these postures, adopted for long periods during work, are very likely to lead to the development of musculoskeletal injuries. The mean working heart rates were 123.3 bt.min[superscript (-1)] and 117.6 bt.min[superscript (-1)] during chainsaw operations and stacking respectively. During the step test, the mean heart rate and oxygen uptake responses were 127.9 bt.min[superscript (-1)] and 22.9 mlO[subscript 2].kg[superscript (-1)].min[superscript (-1)] (Chainsaw Operators) and 116.9 bt.min[superscript (-1)] and 24.0 mlO[subscript 2].kg[superscript (-1)].min[superscript (-1)] (Stackers), revealing no significant difference between the ‘working’ heart rates and the heart rates recorded during the step test. Physiological responses were analyzed over the full work shift which was divided into four quarters. Heart rate and oxygen uptake were significantly higher during the last half of the Chainsaw Operators’ work shift compared to the first half. Heart rate increased from 120.7 bt.min[superscript (-1)] during the first quarter to 127.4 bt.min[superscript (-1)] during the last quarter of chainsaw operations. Likewise, oxygen uptake increased from 19.9 mlO[subscript 2].kg[superscript (-1)].min[superscript (-1)] to 22.9 mlO[subscript 2].kg[superscript (-1)].min[superscript (-1)] from the first to the last quarter of work. During stacking the heart rate (mean of 117.6 bt.min[superscript (-1)]) and oxygen uptake (mean of 24.6 ml.kg[superscript (-1)].min[superscript (-1)]) responses remained stable over the duration of the working shift. Workers lost, on average, 2.8% body mass during work while felling and cross-cutting and 3.6% during stacking. This reduced significantly to a loss of 0.4% body mass when re-tested following the introduction of water and food during the work period. Likewise, the energy deficit was significantly improved due to the introduction of a nutritional supplement. Pre-intervention the deficit was 8861.8 kJ (Chainsaw Operators) and 8804.2 kJ (Stackers) while in the post-intervention phase this deficit was reduced by approximately 50% for both groups of workers.
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- Date Issued: 2006
A financial planning model for retirement, taking into account the impact of pre-retirement funding income, age and taxation
- Authors: Barnes, Andrew
- Date: 2006
- Subjects: Retirement -- South Africa Retirement income -- Planning -- South Africa Pensions -- Planning -- South Africa Finance, Personal Investments Income tax -- Law and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:895 , http://hdl.handle.net/10962/d1004532
- Description: Individuals are often not aware of the required level of contributions needed to fund a retirement savings plan. This problem is compounded by the fact that the assistance provided to these individuals by way of commercially-available retirement planning models does not take into account the effect of income tax on the level of required retirement savings contributions and recent changes in the tax legislation to the income tax payable by individuals has had a significant effect on these required levels. As a preamble to the research process, an exploratory questionnaire was administrated to a sample of individuals, which was designed to measure the level of awareness of these individuals of the contributions to a retirement savings plan needed to fund their postretirement financial needs, and of the impact of age, the level of income and income tax on their contributions. Responses to the questionnaire indicated a low level of awareness of retirement planning amongst these individuals. A retirement planning model was then designed to test the effect of earnings, age and changes in tax legislation on the level of an individual's required monthly contributions to a retirement savings plan. Independent variables of age and income were processed using the model. These same variables were then processed using the Old Mutual and Liberty Life retirement planning models and a comparison was made between the model developed in the research and these commercially developed models, to assess their usefulness and limitations. Based on the above comparison, it appeared that the Old Mutual and Liberty Life retirement models both included the effects of the individual marginal tax rates in their calculations. However, they appeared to be using marginal tax rates which were higher than those reflected in the 2006 individual income tax tables. In addition these models did not include the effect of income tax exemptions and deductions and they therefore provided more conservative estimates than the retirement planning model designed in the research. Recent tax adjustments have had the effect of greatly increasing the after-tax income of individuals and therefore it is important to include the effects of changes in tax legislation in determining the monthly contributions to a retirement savings plan.
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- Date Issued: 2006
A framework for responsive content adaptation in electronic display networks
- Authors: West, Philip
- Date: 2006
- Subjects: Computer networks , Cell phone systems , Wireless communication systems , Mobile communication systems , HTML (Document markup language) , XML (Document markup language)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4589 , http://hdl.handle.net/10962/d1004824 , Computer networks , Cell phone systems , Wireless communication systems , Mobile communication systems , HTML (Document markup language) , XML (Document markup language)
- Description: Recent trends show an increase in the availability and functionality of handheld devices, wireless network technology, and electronic display networks. We propose the novel integration of these technologies to provide wireless access to content delivered to large-screen display systems. Content adaptation is used as a method of reformatting web pages to display more appropriately on handheld devices, and to remove unwanted content. A framework is presented that facilitates content adaptation, implemented as an adaptation layer, which is extended to provide personalization of adaptation settings and response to network conditions. The framework is implemented as a proxy server for a wireless network, and handles HTML and XML documents. Once a document has been requested by a user, the HTML/XML is retrieved and parsed, creating a Document Object Model tree representation. It is then altered according to the user’s personal settings or predefined settings, based on current network usage and the network resources available. Three adaptation techniques were implemented; spatial representation, which generates an image map of the document, text summarization, which creates a tree view representation of a document, and tag extraction, which replaces specific tags with links. Three proof-of-concept systems were developed in order to test the robustness of the framework. A system for use with digital slide shows, a digital signage system, and a generalized system for use with the internet were implemented. Testing was performed by accessing sample web pages through the content adaptation proxy server. Tag extraction works correctly for all HTML and XML document structures, whereas spatial representation and text summarization are limited to a controlled subset. Results indicate that the adaptive system has the ability to reduce average bandwidth usage, by decreasing the amount of data on the network, thereby allowing a greater number of users access to content. This suggests that responsive content adaptation has a positive influence on network performance metrics.
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- Date Issued: 2006
A genetic and ecophysiological comparison of co-occuring indigenous (Perna perna) and invasive (Mytilus galloprovincialis) intertidal mussels
- Authors: Zardi, G I
- Date: 2006
- Subjects: Perna -- South Africa Mytilus galloprovincialis -- South Africa Mussels -- South Africa Mytilidae -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5613 , http://hdl.handle.net/10962/d1003066
- Description: The Mediterranean mussel Mytilus galloprovincialis is the most successful marine invasive species in South Africa. Its presence has had significant ecological consequences on the intertidal communities of the west coast. On the south coast, M galloprovincialis co-exists and competes with the indigenous intertidal mussel Perna perna in the lower balanoid zone, where they show partial habitat segregation. The upper and the lower mussel zones are dominated by M. galloprovincialis and P. perna respectively while they co-occur in the mid zone. In this thesis M. galloprovincialis and P. perna are compared in terms of their population genetics and their ecophysiology. The success of an invader depends on its ability to react to new environmental factors, especially when compared to indigenous species. The distribution and diversity of intertidal species throughout the world are strongly influenced by periodic sand inundation and hydrodynamic stress. Occupying the lower intertidal zone, P. perna is more strongly influenced by sand (burial and sand in suspension) than M. galioprovincialis. Despite this, P. perna is more vulnerable to the effects of sand, showing higher mortality rates under experimental conditions in both the laboratory and the field. M. galioprovincialis has longer labial palps than P. perna, indicating a better ability to sort particles. This, and a higher tolerance to anoxia, explains its lower mortality rates when exposed to burial or suspended sand. Habitat segregation is often explained by physiological tolerances, but in this case, such explanations fail. The ability of a mussel to withstand wave-generated hydrodynamic stress depends mainly on its byssal attachment strength. The higher attachment strength of P. perna compared to M. galioprovincialis and of solitary mussels compared to mussels living within a bed (bed mussels) can be explained by more and thicker byssal threads. M galloprovincialis also has a wider shell, is subjected to higher hydrodynamic loads than P. perna and shows a higher theoretical probability of dislodgement, this is borne out under field conditions. The attachment strength of both species increased from higher to lower shore, in parallel to a gradient of a stronger wave action. Monthly measurements showed that P. perna is always more strongly attached than M. galloprovincialis and revealed seasonal fluctuations of attachment strength for both species in response to wave height. The gonad index of both species was negatively cross-correlated with attachment strength. The results are discussed in the context of the evolutionary strategy of the alien mussel, which directs most of its energy to fast growth and high reproductive output, apparently at the cost of reduced attachment strength. This raises the prediction that its invasive impact will be more pronounced at sites subjected to low or moderate wave action at heavily exposed sites. The potential of a species for invasion is also determined by the ability of the invader to disperse. Population genetics provide indirect information about dispersal through a direct measurement of gene flow. The low genetic divergence (measured as mtDNA) of M. galloprovincialis confirms its recent arrival in South Africa. In contrast, the population genetics structure of P. perna revealed strong divergence on the south-east coast, resulting in a western lineage (straddling the distributional gap of the Benguela System), and an eastern lineage, with an overlap region of the two on the south coast between Kenton-on-Sea and Haga Haga. This genetic disjunction may be caused by Agulhas Current acting as an oceanographic barrier to larval dispersal, or by different environmental selective forces acting on regional populations. Over the last ten years, M. galloprovincialis has shown a decrease or cessation of its spread to the east in exactly the region of the genetic disjunction in P. perna, again suggesting either an oceanographic barrier to larval dispersal, or increasing selection driven by sharp gradients in environmental conditions.
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- Date Issued: 2006
A global ionospheric F2 region peak electron density model using neural networks and extended geophysically relevant inputs
- Authors: Oyeyemi, Elijah Oyedola
- Date: 2006
- Subjects: Neural networks (Computer science) Ionospheric electron density Ionosphere Ionosphere -- Mathematical models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5470 , http://hdl.handle.net/10962/d1005255
- Description: This thesis presents my research on the development of a neural network (NN) based global empirical model of the ionospheric F2 region peak electron density using extended geophysically relevant inputs. The main principle behind this approach has been to utilize parameters other than simple geographic co-ordinates, on which the F2 peak electron density is known to depend, and to exploit the technique of NNs, thereby establishing and modeling the non-linear dynamic processes (both in space and time)associated with the F2 region electron density on a global scale. Four different models have been developed in this work. These are the foF2 NN model, M(3000)F2 NN model, short-term forecasting foF2 NN, and a near-real time foF2 NN model. Data used in the training of the NNs were obtained from the worldwide ionosonde stations spanning the period 1964 to 1986 based on availability, which included all periods of calm and disturbed magnetic activity. Common input parameters used in the training of all 4 models are day number (day of the year, DN), Universal Time (UT), a 2 month running mean of the sunspot number (R2), a 2 day running mean of the 3-hour planetary magnetic index ap (A16), solar zenith angle (CHI), geographic latitude (q), magnetic dip angle (I), angle of magnetic declination (D), angle of meridian relative to subsolar point (M). For the short-term and near-real time foF2 models, additional input parameters related to recent past observations of foF2 itself were included in the training of the NNs. The results of the foF2 NN model and M(3000)F2 NN model presented in this work, which compare favourably with the IRI (International Reference Ionosphere) model successfully demonstrate the potential of NNs for spatial and temporal modeling of the ionospheric parameters foF2 and M(3000)F2 globally. The results obtained from the short-term foF2 NN model and nearreal time foF2 NN model reveal that, in addition to the temporal and spatial input variables, short-term forecasting of foF2 is much improved by including past observations of foF2 itself. Results obtained from the near-real time foF2 NN model also reveal that there exists a correlation between measured foF2 values at different locations across the globe. Again, comparisons of the foF2 NN model and M(3000)F2 NN model predictions with that of the IRI model predictions and observed values at some selected high latitude stations, suggest that the NN technique can successfully be employed to model the complex irregularities associated with the high latitude regions. Based on the results obtained in this research and the comparison made with the IRI model (URSI and CCIR coefficients), these results justify consideration of the NN technique for the prediction of global ionospheric parameters. I believe that, after consideration by the IRI community, these models will prove to be valuable to both the high frequency (HF) communication and worldwide ionospheric communities.
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- Date Issued: 2006
A holistic approach to consumption analysis in the popular music market
- Authors: Scheckter, Jonathan
- Date: 2006
- Subjects: Consumption (Economics) -- Moral and ethical aspects , Music trade -- South Africa , Popular music -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:981 , http://hdl.handle.net/10962/d1002715 , Consumption (Economics) -- Moral and ethical aspects , Music trade -- South Africa , Popular music -- Economic aspects -- South Africa
- Description: This thesis seeks to gain a holistic understanding of consumption issues in the popular music market, such that it needs to account for the influence of 1) technological factors, 2) institutional factors, 3) cultural factors, and 4) an ontological aspect; as these are identified to be the most prominent aspects in the literature on the market. While there is a bourgeoning literature on the market, there has been little formal attempt to link such issues in a comprehensive fashion. The methodology applied provides a critique of the literature on specific consumption theories which have apparent pertinence to the music market. Each of the sociological, psychological, and economic theories (neoclassical and radical) is found to be too generalized to provide such an understanding, in that many issues concerning the music market would need to be eschewed if these theories were to be applied in an orthodox fashion. Moreover, the theories tend to point towards each other for the possibility of a credible, holistic consumption analysis. The most useful and all-encompassing consumption theory reviewed is the systems of provision approach advanced by Fine and Leopold (1993), in that the approach aims to be sensitive to the difference between commodities in terms of the economic and social processes and structures by which they become commodities, and thus it can allow one to consider adequately the four requirements identified above for a holistic understanding of the market. This approach is then applied to the western music market with the aim of 1) testing the approach identified, and 2) making a specific comment of the market. The market is found to be characterized historically by three distinct periods, each with distinct systems of provision (i.e. each with the four factors identified above relating to each other in a certain manner). It is proposed that preference formations in the final period identified have been institutionalized to a large extent, and there is a low probability of change occurring. The systems of provision approach is argued to be beneficial in highlighting which aspects of the existing consumption theories are relevant to the market at a point in time, and to what extent. Thus the richness of the approach stems from its ability to gain a holistic understanding, and to identify theoretical discussion topics, such as those concerning political economy. The approach is then applied to the South African music market, using the same historical methodology, in conjunction with current empirical evidence from the market. Doing this allows one to test the generality of the systems of provision approach, and to attempt to make a comment on the South African market. The techniques for obtaining empirical evidence are argued to be sound, but resource constraints prevented the research from reflecting a holistic view of the market. Nonetheless, a rich perspective is provided from interviews with prominent agents in the market, and thus the chapter is argued to provide the beginning of an understanding of preference formations in the South African music market, in which little research has been conducted (Stella, 2005).
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- Date Issued: 2006
A model for the development of service agreements in the Information and Communication Technology sector
- Authors: Johnston, Robert
- Date: 2006
- Subjects: Information technology , Communication -- Technological innovations , Service industries -- Management , Service -- Level agreements
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1143 , http://hdl.handle.net/10962/d1002772 , Information technology , Communication -- Technological innovations , Service industries -- Management , Service -- Level agreements
- Description: SAs are documents that specify the business relationship between stakeholders to an outsourcing agreement. SAs specify this relationship in a legally binding manner that assists in managing expectations of the stakeholders about the service provision. According to Verma (1999), an SA is a precise statement of the expectations and obligations that exist in a business relationship between two organisation: the service provider and the client. In order for organizations to have successful outsourcing partnerships, they need well crafted methods of developing Service Agreements (SAs). Successful methods will produce a conclusive contract that will act as a working document that details the spirit of cooperation between the service provider and the service recipient. This research investigates the development of SAs in the Information and Communication Technology (ICT) sector, and proposes a model for their development. A number of models for SA development have been analysed. Models are analysed from leading researchers in the area, from software houses such as Microsoft and from international standards organisations such as the BS15000 which stipulates the ITIL framework. Eight development principles are identified and explored. An investigation into SAs and their development is conducted. A model is proposed that is composed of the development principles. The development of SAs was explored in an empirical study by means of a survey administered to industry practitioners and a series of interviews with managers in the ICT industry. The results of the study indicate varying levels of support for the development principles and limited relationship between the development principles and the success of the SA, as defined by the number of changes made to the SA after it is completed.
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- Date Issued: 2006
A precarious balance: consequences of Zimbabwe's fast-track land reform
- Authors: Sarimana, Ashley
- Date: 2006
- Subjects: Land reform -- Zimbabwe , Land use -- Government policy -- Zimbabwe , Land settlement -- Government policy -- Zimbabwe , Farms, Large -- Zimbabwe , Agriculture and state -- Zimbabwe , Agricultural laborers -- Zimbabwe , Zimbabwe -- Economic conditions
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3348 , http://hdl.handle.net/10962/d1006198 , Land reform -- Zimbabwe , Land use -- Government policy -- Zimbabwe , Land settlement -- Government policy -- Zimbabwe , Farms, Large -- Zimbabwe , Agriculture and state -- Zimbabwe , Agricultural laborers -- Zimbabwe , Zimbabwe -- Economic conditions
- Description: This thesis is a detailed account of Zimbabwe's controversial fast-track land reform programme. Zimbabwe's land reform history has been discussed extensively, with a focus on land redistribution. The fast-track land reform programme transferred eleven million hectares of land from 4 000 white commercial farmers to 51 543 landless peasant families. The thesis begins by offering some land reform theories and gives an overview of the land question in Southern Africa. This is followed by a discussion of Zimbabwe's land question from a historical perspective. Next is a periodised account of the successes and failures of land reform attempts made by the Zimbabwean government from independence in 1980 to 1998 when the fast-track land reform programme was conceived. Zimbabwe's political and economic situation at this time is significant. The context for fast-track land reform includes a discussion about the national question in Zimbabwe and the deteriorating status of white citizenship; the rise of Zimbabwe's liberation war veterans as a formidable force and the formation of the Movement for Democratic Change as a strong political party that was challenging, among others, the dominance of the ruling Zanu-PF party and its policies. The blueprint for fast-track land reform is discussed in order to contrast it to how the reform unfolded in practice. In this regard, the response of the international community to the violence and lawlessness that characterised fast-track land reform is worth mentioning, especially since it has bearing on how Zimbabweans are trying to cope with life in a radically altered physical and social environment, following the land reform exercise. The consequences of fast-track land reform are analysed in terms of development and the plight of Zimbabwe's farm workers; the internal displacement of hundreds of thousands of farm workers, white commercial farmers and others in Zimbabwe's countryside and whether or not fast-track land reform beneficiaries can successfully engage in agriculture to improve their standard of living. The Vumba and Burma Valley case study is illustrative of how fasttrack land reform was implemented and its socio-economic impact on Zimbabwe's poor and marginalised groups, for instance, female farm workers. The case study offers valuable insights about the survival strategies that ordinary people affected by the land reform exercise are adopting in order to cope with their new circumstances. Data was gathered from a focus group discussion (pilot study), in-depth semi-structured interviews and observation on three farms, as well as interviews with a few government officials, government documents and newspaper reports. The study is useful to countries that are planning or already implementing land reform, for example, South Africa.
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- Date Issued: 2006
A review of lessons learned to inform capacity-building for sustainable nature-based tourism development in the European Union funded ʺSupport to the Wild Coast Spatial Development Initiative Pilot Programmeʺ
- Authors: Wright, Brian Bradley
- Date: 2006
- Subjects: Wild Coast Spatial Development Initiative Pilot Programme , Sustainable development -- South Africa -- Eastern Cape -- Citizen participation , Sustainable development -- Environmental aspects -- South Africa -- Eastern Cape , Conservation and natural resources -- South Africa -- Eastern Cape , Natural resources -- Management -- South Africa -- Eastern Cape , Natural resources -- Management -- International cooperation , Rural development -- South Africa -- Eastern Cape , Eastern Cape (South Africa) -- Economic development , South Africa -- Foreign economic relations -- European Union countries , European Union countries -- Foreign economic relations -- South Africa , Ecotourism -- South Africa -- Eastern Cape -- Citizen participation , Tourism -- Environmental aspects -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1744 , http://hdl.handle.net/10962/d1003628 , Wild Coast Spatial Development Initiative Pilot Programme , Sustainable development -- South Africa -- Eastern Cape -- Citizen participation , Sustainable development -- Environmental aspects -- South Africa -- Eastern Cape , Conservation and natural resources -- South Africa -- Eastern Cape , Natural resources -- Management -- South Africa -- Eastern Cape , Natural resources -- Management -- International cooperation , Rural development -- South Africa -- Eastern Cape , Eastern Cape (South Africa) -- Economic development , South Africa -- Foreign economic relations -- European Union countries , European Union countries -- Foreign economic relations -- South Africa , Ecotourism -- South Africa -- Eastern Cape -- Citizen participation , Tourism -- Environmental aspects -- South Africa -- Eastern Cape
- Description: This case-study establishes the influences of power-knowledge relationships on capacity-building for sustainability in the European Union Funded ‘Wild Coast Spatial Development Initiative Pilot Programme’ (EU Programme). It aims to capture the lessons learned for capacitybuilding to support nature-based tourism initiatives on the Wild Coast. The EU Programme aimed to achieve economic and social development of previously disadvantaged communities through nature-based tourism enterprises, and to develop capacity of local authorities and communities to support environmental management. The study discusses common trends in thematic categories emerging from the research data, and contextualises research findings in a broader development landscape. This study indicates that power-knowledge relations were reflected in the EU Programme’s development ideology by an exclusionary development approach, which lacked a participatory ethos. This exclusionary approach did not support an enabling environment for capacity-building. This development approach, guiding the programme conceptualization, design and implementation processes, resulted in a programme with unrealistic objectives, time-frames and resource allocations; a programme resisted by provincial and local government. The study provides a causal link between participation, programme relevance, programme ownership, commitment of stakeholders, effective management and capacity-building for sustainable programme implementation. The study argues that the underlying motivation for the exclusionary EU development ideology in the programme is driven by a risk management strategy. This approach allows the EU to hold power in the development process, whereas, an inclusionary participative development methodology would require a more in-depth negotiation with stakeholders, thereby requiring the EU to relinquish existing levels of power and control. This may increase the risk of an unexpected programme design outcome and associated exposure to financial risk. It may also have a significant financial effect on donor countries' consultancies and consultants currently driving the development industry. This study recommends an interactive-participative methodology for programme design and implementation, if an enabling environment for capacity-building is to be created. In addition, all programme stakeholders must share contractual accountability for programme outcomes. This requires a paradigm shift in the EU development ideology to an inclusionary methodology. However, this research suggests that the current EU development approach will not voluntarily change. I, therefore, argue that South Africa needs to develop a legislative framework that will guide donor-funded development programme methodology, to support an enabling environment for capacity-building.
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- Date Issued: 2006
A review of the actuaries' capitalisation rate from an economic perspective
- Authors: Turner, Jason
- Date: 2006
- Subjects: Macroeconomics , Keynesian economics , Insurance -- Mathematics , South Africa -- Economic conditions -- 1961-1991 , South Africa -- Economic policy
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:992 , http://hdl.handle.net/10962/d1002727 , Macroeconomics , Keynesian economics , Insurance -- Mathematics , South Africa -- Economic conditions -- 1961-1991 , South Africa -- Economic policy
- Description: The purpose of this paper was to evaluate if the macroeconomic change that has occurred in the South African economy since the 1980s has been significant enough to justify a re-examination of the actuaries’ capitalisation rate, due to its formulation processes dependence on the macroeconomic situation. The need for the reexamination arises from the use of the capitalisation in the calculation of lump sum awards where even a small change in the rate can have a significant impact on the value of the final award. In order to address the issue an examination of how Keynesian expectations are formulated and an examination of the Government’s macroeconomic policy was conducted to provide the foundation. On this foundation, a trend analysis of the major groups of financial instruments, as well as the current outlooks for the South African economy, was conducted to determine if there was any indication of a significant change in the macroeconomic conditions. The results of the analysis provided a compelling case for the urgent need for the actuaries’ capitalisation rate to be recalculated to account for the changed economic situation.
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- Date Issued: 2006
A study of fuzzy sets and systems with applications to group theory and decision making
- Authors: Gideon, Frednard
- Date: 2006
- Subjects: Fuzzy sets , Fuzzy systems , Abelian groups , Decision making
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5417 , http://hdl.handle.net/10962/d1005231 , Fuzzy sets , Fuzzy systems , Abelian groups , Decision making
- Description: In this study we apply the knowledge of fuzzy sets to group structures and also to decision-making implications. We study fuzzy subgroups of finite abelian groups. We set G = Z[subscript p[superscript n]] + Z[subscript q[superscript m]]. The classification of fuzzy subgroups of G using equivalence classes is introduced. First, we present equivalence relations on fuzzy subsets of X, and then extend it to the study of equivalence relations of fuzzy subgroups of a group G. This is then followed by the notion of flags and keychains projected as tools for enumerating fuzzy subgroups of G. In addition to this, we use linear ordering of the lattice of subgroups to characterize the maximal chains of G. Then we narrow the gap between group theory and decision-making using relations. Finally, a theory of the decision-making process in a fuzzy environment leads to a fuzzy version of capital budgeting. We define the goal, constraints and decision and show how they conflict with each other using membership function implications. We establish sets of intervals for projecting decision boundaries in general. We use the knowledge of triangular fuzzy numbers which are restricted field of fuzzy logic to evaluate investment projections.
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- Date Issued: 2006
A study of perceptions, attitudes and knowledge as it pertains to susceptibility to HIV/AIDS among grade 11 pupils in Grahamstown
- Authors: Mdziniso, Nompumelelo B
- Date: 2006
- Subjects: AIDS (Disease) -- Social aspects -- South Africa -- Grahamstown , HIV infections -- Social aspects -- South Africa -- Grahamstown , AIDS (Disease) in adolescence -- South Africa -- Grahamstown -- Attitudes , Youth -- Sexual behavior -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3157 , http://hdl.handle.net/10962/d1007623 , AIDS (Disease) -- Social aspects -- South Africa -- Grahamstown , HIV infections -- Social aspects -- South Africa -- Grahamstown , AIDS (Disease) in adolescence -- South Africa -- Grahamstown -- Attitudes , Youth -- Sexual behavior -- South Africa -- Grahamstown
- Description: HIV/AIDS has emerged as the leading cause of death in South Africa, with young people being the most affected. Awareness of HIV/AIDS is quite high, yet prevalence rates have not stabilised and are still climbing. Lack of sexual behavioural change among young people is a major factor which explains why prevalence rates are still on the increase among this population. Sexual behaviour change is influenced by perceptions and attitudes, most notably perceived susceptibility. Information on the psychological factors that affect perceived susceptibility can provide an important base for the development of programmes aimed at reducing further transmission among young people. A survey, using a self-administered, anonymous questionnaire with close-ended questions to collect data, was conducted among Grade 11 learners (n = 318) in Rini, Grahamstown, South Africa. One of the constructs (namely Perceived Susceptibility) in the Health Belief Model informed the data collection. The data generated were first analysed descriptively, providing percentages for responses. Secondly cross-tabulations were calculated. The results showed that knowledge about HIV/AIDS is sufficient, young people receive accurate and non-conflictual messages about sex and HIV/AIDS, they are not discriminatory towards People Living With HIV/AIDS, they have adequate access to healthcare and their perceived susceptibility to HIV/AIDS is high. All these are factors which are favourable and conducive for positive sexual behavioural change. However, the study also found that there was little behaviour change among young people especially regarding regular condom use and decreased sexual activity.
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- Date Issued: 2006
A survey of customer satisfaction, expectations and perceptions as a measure of service quality in SANBS
- Authors: Mququ, Mpumzi H
- Date: 2006
- Subjects: South African National Blood Service Consumer satisfaction Customer services -- Quality control Customer services -- Rating of Blood banks -- Quality control -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:767 , http://hdl.handle.net/10962/d1003888
- Description: The purpose of the study is to evaluate the service quality that the SANBS provides to its customers, by measuring customers’ perceptions and their expectations of service quality provided by the supplier of blood transfusion services. The organization that is used for this study is the South African National Blood Service (SANBS). Specifically the study seeks to: 1. Determine the extent to which customers are satisfied or not satisfied with the service they receive from the SANBS using the ten-dimensional format of SERVQUAL model, modified to the specific service quality requirements of the blood transfusion service industry. 2. Establish customers’ perceptions of the service they receive using a multiple-item scale (SERVQUAL) for measuring consumer perceptions of service quality. 3. Establish customers’ expectations of the service, and compare them to their perceptions of the service they currently receive. The comparison is made along each service quality dimension, across different parts of same service on a geographical basis, and across different customer groups on a customer category (or type) basis. 4. Recommend implementation of appropriate service quality performance improvement procedures where necessary. Study design and methods: The data for the study came from the SANBS’ customer perception and expectation survey conducted in 2005. Questionnaires were sent out to hospitals that use products and services provided by the SANBS in the Eastern Cape and KwaZulu-Natal Provinces of South Africa. The questionnaire was based on the multiple-item SERVQUAL model for measuring consumer perceptions of service quality, modified and tailored to specific service quality requirements of the blood transfusion service industry. Questionnaires were sent out to 113 (69.3%) hospitals out of a total of 163 blood-utilizing hospitals in the two provinces. Of the 113 hospitals, 92 (81.4%) responded, with questionnaires rendered unusable. The final sample size is 88 and is included in the final study database. The data is analyzed by comparing different parts of the service on a geographical basis namely KwaZulu-Natal and Eastern Cape zones. The data is also analyzed by comparing different customer groups namely the Rural State Hospitals, the Urban State Hospitals and Private Hospitals. Results: The result confirms the research (alternative) hypothesis (H1 : μ1 ≠ μ2), and rejects Ho. The overall expectations ratings are higher than the perceptions ratings, and the KwaZulu-Natal expectations ratings are higher than the Eastern Cape ratings. The expectations of private hospitals and rural state hospitals have a higher rating than that of urban state hospitals and the perceptions of private and urban state hospitals have a higher rating than that of rural state hospitals. The largest service quality gap is the accessibility dimension which relates specifically to approachability and ease with which customers can access staff at different levels of the organization by e-mail, and includes accessing of knowledgeable blood bank personnel and medical staff of SANBS, but may also relate to the distance of hospitals from the nearest blood bank, all of which are situated in urban state hospitals. The mean difference for accessibility is the highest followed by the understanding customer mean difference. The mean differences for the other dimension categories are significantly less than that of the largest two dimensions, but not significantly different amongst themselves. The mean difference for rural state hospitals is the largest followed by private hospitals and urban state hospitals. The mean difference for rural state hospitals is greater than that for urban state hospitals in both zones, but the mean difference for private hospitals is greater in KwaZulu-Natal than in the Eastern Cape. The dimension means of differences for rural state hospitals are greater than that for urban state hospitals. According to the correlations between expectations and perceptions for different dimensions, there is a weak or no linear relationship between expectations and perceptions. Conclusion: This empirical study supports the literature on the provision of service quality, and concludes that there is a statistically significant difference or gap between the services offered by the SANBS as perceived by its customers, and the expectations of its customers. The study substantiates the need for management of blood transfusion services to take into account customer perceptions of service quality and their expectations, and upon identification of gaps, to implement appropriate service quality improvement processes, rather than take a one sided view of their (SANBS’) own perception of service quality.
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- Date Issued: 2006
A taxonomic revision of the genera of the subtribe Dracophilinae (Aizoaceae: Ruschioideae)
- Authors: Mannheimer, Coleen Anne
- Date: 2006
- Subjects: Aizoaceae , Plants -- Classification , Cladistic analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4247 , http://hdl.handle.net/10962/d1007461 , Aizoaceae , Plants -- Classification , Cladistic analysis
- Description: Namibia, Juttadinteria and Dracophilus, the three genera belonging to the subtribe Dracophilinae Schwantes (Aizoaceae: Ruschioideae) were revised. Macro-morphology, leaf anatomy and micromorphology of leaf epidermides, pollen, tapetal orbicules and seed were studied in order to test taxon limits, to determine relationships between taxa, and to improve knowledge of their characteristics as well as the taxonomy of the subtribe. The investigation was based on herbarium specimens, field observations and cultivated, living plants. Phenetic cluster analyses were used to confirm species while intergeneric and interspecific relationships of the taxa so indicated were later tested by means of a phylogenetic analysis. The existence of the three genera was provisionally upheld by this study although phylogenetic analysis showed Namibia nested as a strongly supported monophyletic group within a poorly supported luttadinteria. Further work is needed to clarify whether Namibia should be sunk into Juttadinteria. The latest treatments of Juttadinteria and Dracophilus by Hartmann (2001) were supprted. However, in contrast to her latest treatment of Namibia, N. pomonae was sunk into N. cinerea and N. ponderosa was reinstated and typified. Juttadinteria was found to be a poorly resolved genus with many intergrading and overlapping characters, possible due to recent speciation. Possible subspecific groups within J. deserticola and J. simpsonii were indicated by the phenetic study but further work is needed before any formal infraspecific taxonomic rank can be assigned to them. Detailed descriptions of the nine elucidated species and the three genera as well as new keys for their identification are provided in order to facilitate further work in this group. Distribution maps are provided for the genera and species, and the subtribe. Variation of character states within the subtribe, distribution area, ecology and biology are discussed.
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- Date Issued: 2006
A VLBI polarisation study of 43 GHZ SiO masers towards VY CMA
- Authors: Richter, Laura
- Date: 2006
- Subjects: Very long baseline interferometry , Polarization (Light) , Masers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5498 , http://hdl.handle.net/10962/d1005284
- Description: This thesis reports the calibration, imaging and analysis of one epoch of VLBI observations of the v (italics) = J (italics) = 1-0 transition of SiO towards VY CMa. Full polarisation information was recorded, allowing high resolution synthesis maps of each of the four Stokes parameters to be produced. A total of 81 maser components were extracted from the total intensity map, each approximately 1 mas in size. The emission spans approximately 100 x 80 mas in right ascension and declination and is concentrated to the east. The maser component positions were fitted to a ring of radius ~ 3.2R₊ (italics), or 7.2 x 1O¹⁴ cm for a stellar distance of 1.5 kpc. If the stellar position is assumed to be the centre of this ring then almost all of the maser components fall within the inner dust shell radius, which is at ~ 5R (italics)ϰ All of the maser components fall between 1.5R (italics)ϰ and 6R (italics)ϰ. A velocity gradient with position angle was observed in the sparsely filled western region of the maser ring. If interpreted as evidence of shell rotation, this gradient implies a rotational velocity of v (italics) rot (subscirpt) sin i (italics) = 18 km.s⁻¹. The fractional circular and linear polarisations of the maser spots were derived from the Stokes parameter maps. The mean fractional circular polarisation of the masers components was ~ 2 percent and the median fractional linear polarisation was ~ 6 percent, with many spots displaying over ~ 30 percent linear polarisation. The mean circular polarisation implies a magnetic field of ~ 4 G in the SiO maser region if the polarisation is due to Zeeman splitting. Two maser components display a rotation of linear polarisation position angle with velocity, possibly implying a connection between the magnetic field and the velocity field variations in the region of these components.
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- Date Issued: 2006
Adaptive livelihood strategies of the Basarwa: a case of Khwai and Xaxaba, Ngamiland district, Botswana
- Authors: Madzwamuse, Masego S
- Date: 2006
- Subjects: San (African people) -- Botswana , Land use -- Botswana , Rural development -- Botswana , Natural resources -- Management -- Botswana , Conservation of natural resources -- Botswana , Climatic changes -- Environmental aspects -- Botswana
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:4737 , http://hdl.handle.net/10962/d1005286 , San (African people) -- Botswana , Land use -- Botswana , Rural development -- Botswana , Natural resources -- Management -- Botswana , Conservation of natural resources -- Botswana , Climatic changes -- Environmental aspects -- Botswana
- Description: This thesis looks into the land use and natural resource management systems of Basarwa communities in Ngamiland in the northwest of Botswana. The study specifically focuses on Basarwa communities living in and on the edges of the Okavango Delta. The link between these communities and their natural resources is explored using the Sustainable Rural Livelihoods Framework and the Adaptive Renewal Cycle. The core assumption in this thesis is that livelihood strategies are constantly renewed and adapted to promote resilience in ecological and social systems. Fieldwork data collected between May 2000 and July 2001 and secondary data is used to deliberate on this point. The thesis confirms that the Basarwa’s livelihood strategies were adaptive only in as far as traditional livelihoods are concerned. The thesis traces the changes that the Basarwa have experienced as a result of policy restrictions through the different phases of the adaptive renewal cycle. The period following Independence in Botswana saw a policy shift which resulted in the Basarwa becoming landless. With mainly land-based livelihood strategies, the Basarwa were faced with new forms of crises and vulnerability which their traditional adaptive strategies were not designed for. It comes to the conclusion that the Basarwa are currently stuck in a reorganisation phase; however, the CBNRM Draft Policy of Botswana offers a glimpse of hope as it provides an opportunity for the Basarwa to progress through the full cycle of reorganisation, renewal, conservation and release.
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- Date Issued: 2006
Against supererogationism
- Authors: Van Niekerk, Jason Bradley
- Date: 2006
- Subjects: Supererogation , Supererogation -- History , Values , Ethics -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2731 , http://hdl.handle.net/10962/d1004268 , Supererogation , Supererogation -- History , Values , Ethics -- History
- Description: In this thesis, I argue that we have no reason to accept the existence of a category of supererogatory moral goods: that is, good acts that carry no pressure to bring them about. Despite the counterintuitive nature and suspicious provenance of the concept, Supererogationism is the orthodoxy in Ethics, and I examine promising but unsuccessful responses to it by Peter Singer and Kwame Gyekye. Responding in particular to David Heyd's Supererogationism - but also to J. O. Urmson, Susan Wolf, and Jonathan Dancy - I develop an account of the principle "Good implies Ought" that does not entail absurd over-obligation. I argue that this Anti-Supererogationist model stands up to the four strongest arguments against such a position, and that it embraces a more accurate account of the relation between values and oughts than Supererogationists are capable of supplying. Finally, I sketch a detailed eudaimonist account of the principle umuntu ngumuntu ngabantu - that our commitment to the good of others stems from our flourishing being caught up with theirs.
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- Date Issued: 2006
Ameliorating poverty in South Africa through natural resource commercialisation
- Authors: Shackleton, Sheona E
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6651 , http://hdl.handle.net/10962/d1007062
- Description: This short policy brief advocates for more attention to be paid to the potential of natural resource commercialisation as a means to livelihood security and poverty alleviation in rural South Africa. It is one of a set of four policy briefs based on the findings of several case studies across the country.
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- Date Issued: 2006
An analysis of how the Senior Certificate examination constructs the language needs of English second language learners
- Authors: Blunt, Sandra Viki
- Date: 2006 , 2013-06-11
- Subjects: Habermas, Jürgen Education, Secondary -- South Africa Examinations -- South Africa -- Evaluation English language -- Examinations -- South Africa English language -- Study and teaching -- South Africa -- Foreign speakers Language and education -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1902 , http://hdl.handle.net/10962/d1006243
- Description: The Senior Certificate (SC) examination, a focus of the research described in this thesis, has an important function in terms of the quality of the education system overall and also in terms of the contribution of education to the achievement of national goals. The SC examination functions i) as a measure of achievement at school ii) as an indicator of work readiness and iii) as an indicator of the potential to succeed in higher education. This thesis offers a critique of the SC examination in respect of its functions. The way in which learners' language related needs are constructed is crucial in discussing the SC examination's legitimacy since perceptions about the needs of learners are reflected in what is taught and assessed. Since the majority of candidates writing the SC exarnination do so using a language which is not their mother tongue, the research described in the thesis attempted to identify the way in which the English second language (ESL) SC examination papers construct learners' needs. Examination papers represent a particular domain of social practice and are constructed through discourse. In the context of the research described in this thesis, discourses are understood as sets of ideas which are shared by communities of people and which give rise to practices which then define and sustain those communities and, thus, the discourses themselves. Discourse is language insofar as it converges with power and positions people in the interests of power. The ideological nature of discourse necessitates a critical orientation to research which interrogates, challenges and critiques the status quo. To identify the discourses constructing ESL learners' needs I conducted a critical discourse analysis on a representative sarnple of ESL SC exarnination papers and also interviewed six ESL examiners to corroborate the findings of the analysis. This then allowed me to identify several dominant discourses constructing ESL learners' needs: meaning-related, literature-related and process-related. The first meaning-related discourse, 'Received Tradition' discourse, focuses on the rules of grammar and spelling. Rather than approaching language as a resource to enable learners to understand the ideas to which they are exposed, learners are being taught discrete 'skills' to equip them for higher education study and the workplace. It is argued that school-based language literacy practices are not generalizable to the workplace and to higher education. Another aspect of 'Received Tradition' discourse holds that the study of English literature is a medium for understanding life and that there is moral value in teaching English literature. Learners are therefore constructed as lacking these values and their needs as having to acquire them. 'Received Tradition' discourse also overlaps with a second meaning-related discourse, 'Autonomous Text' discourse, which holds that the text's meaning is explicit and that if the learners can manipulate the rules of English grammar, 'have' vocabulary and can spell, they can retrieve meanings from texts they encounter in a wide range of contexts and construct texts for themselves. It is argued that a lack of awareness that meaning is constructed through recourse to other contexts, texts and the learner's experience is disadvantaging ESL candidates. 'Language as an Instrument of Communication' discourse, the last meaning-related discourse identified, sees language as the vehicle used to convey ideas, thoughts, information and beliefs, which are viewed as having been constructed independently of language. It is assumed that the answers, which, according to 'Autonomous Text' discourse, are in the text, can be conveyed if the tools of language are used correctly. The first literature-related discourse identified is 'Literature Study Develops Language Proficiency'. It is argued this is a misperception since language is learned as part of situated practice and instruction must thus be embedded in meaningful communicative contexts involving situated practice. The second literature-related discourse identified, 'Literature Study is a Medium for Understanding Life', is connected to the 'Received Tradition' discourse referred to above which holds that there is moral value in teaching English literature. This research identifies the ideological implications of these discourses, arguing that values are culture-specific and learners from diverse socio-cultural backgrounds experience life differently from the way it is depicted in English literature. Process-related discourses, which are part of the processes of teaching and assessment, concern the inadequacy of the ESL learner and of the markers and therefore dictate what can and cannot be expected of ESL learners in the SC examination. The research showed how all of the above discourses work through the SC curriculum to impose the values and beliefs of particular dominant groups on the ESL learner. Because of the robust and invidious nature of discourses this is a cause for concern. Although it is difficult to set a school leaving examination which serves both workplace and academic functions, there is a need to move beyond traditional, hegemonic approaches to understanding language learning. This thesis offers an analysis which can be used to inform practice.
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- Date Issued: 2006