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Teacher educators' interpretation and practice of learner-centred pedagogy : a case study

  • Authors: Nyambe, Kamwi John
  • Date: 2013-07-16
  • Subjects: Bernstein, Basil B Education -- Philosophy Education (Higher) -- Namibia Teacher educators -- Namibia -- Case studies Universities and colleges -- Namibia -- Case studies Teachers -- Traning of -- Namibia -- Case studies Teachers -- In-service training -- Namibia Student-centered learning -- Namibia
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:1954 , http://hdl.handle.net/10962/d1008260
  • Description: The objective of this study was to understand how teacher educators in a Namibian college of education interpret and practice the learner-centred pedagogy underpinning the Basic Education Teachers Diploma (BETD) program. In order to achieve this objective, a case study approach was adopted, qualitative-interpretive in orientation and drawing upon interviews, naturalistic non-participant observation and document analysis. Bernstein's theory of pedagogy - in particular his notion ofrecontextualization - offered ideas and concepts that were used to generate and analyse data. The data indicated that, at the level of description, teacher educators interpreted leamercentred pedagogy as a pedagogic practice based on weak rules of regulative discourse, or a weak power relation between themselves and their student teachers. The weakening of the rules of regulative discourse and the waning of educator authority were indicated in the interview narratives, which evoked a pedagogic context characterized by a repositioning of the student teacher from the margins to the centre of the classroom, where he or she enjoyed a more active and visible pedagogic position. Contrary to the dis empowering dynamic within classroom practice under the apartheid dispensation, the repositioning of the student teacher suggested a shift of power towards him or her. Similarly, the identification of the teacher educator as afacilitator, which featured prominently in the interview narratives, further suggested a weakening or diminishing of the pedagogic authority of the teacher educator. With regard to rules pertaining to the instructional discourse, the data revealed an interpretation of leamer-centred pedagogy as a pedagogic practice based on strong framing over the selection of discourses, weak framing over pacing, and strong framing over sequencing and criteria for evaluation. When correlated with the interview data, the data generated through lesson observation and teacher educator prepared documents such as lesson plans revealed a disjuncture between teacher educators' ideas about leamer-centred pedagogy and their practice of it. Contrary to the interviews, lesson observation data revealed that teacher educators implemented leamer-centred pedagogy as a pedagogic practice based on strong internal framing over rules of the regulative discourse. Data further indicated strong internal framing over the selection, sequencing, pacing and evaluation. The study concluded that while some teacher educators could produce an accurate interpretation oflearner-centred pedagogy at the level of description, most of them did not do so at the level of practice. Findings revealed structural and personal-psychological factors that constrained teacher educators' recontextualization of the new pedagogy. A narrow understanding of leamercentred pedagogy that concentrated only on changing teacher educators' pedagogical approaches from teacher-centred to learner-centred, while ignoring structural and systematic factors, tended to dominate not only the interview narratives but also official texts. Learner-centred pedagogy was understood as a matter of changing from teachercentredness to leamer-centredness while frame factors, for instance regarding the selection, pacing or sequencing of discourses, still followed the traditional approach. The study recommends the adoption of a systematic and deliberate approach to address the multiplicity of factors involved in enabling teacher educators to interpret and implement leamer-centred pedagogy at the micro-level of their classrooms. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
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A comprehensive university: constructing an organisational identity

  • Authors: Moeng, Siphokazi Florence
  • Date: 2009
  • Subjects: Universities and colleges -- Mergers -- South Africa -- Port Elizabeth , Educational change -- South Africa -- Port Elizabeth , Education, Higher -- South Africa -- Port Elizabeth -- Aims and objectives , Organizational behavior -- South Africa -- Port Elizabeth
  • Language: English
  • Type: Thesis , Doctoral , DEd
  • Identifier: vital:9517 , http://hdl.handle.net/10948/1029 , Universities and colleges -- Mergers -- South Africa -- Port Elizabeth , Educational change -- South Africa -- Port Elizabeth , Education, Higher -- South Africa -- Port Elizabeth -- Aims and objectives , Organizational behavior -- South Africa -- Port Elizabeth
  • Description: The restructuring of higher education through incorporations and mergers has attracted a lot of attention over the past few years in South Africa. These incorporations and mergers have displaced institutions of higher education and positioned them in new organisational homes, thus subjecting faculties, schools and departments to a process of relocation, new knowledge acquisition, identity change and meaning-making processes. The merger has resulted in three types of universities; i.e. traditional universities, comprehensive universities and universities of technology. The introduction of the comprehensive university as a new institutional type has brought with it questions about the idea of the university and the purpose of higher education in general. Mergers in particular have initiated conversations about sense-making and meaning during change. Amidst all this, people within the merging institution have been confronted with a new organisation with which they have to identify. At universities in particular, questions about academic identity and organisational identity have become unavoidable. The boundaries that gave definition to a university have been (re)moved. The structure of the university, as it was known, has changed. Hence, in the newly merged NMMU, academics are in the process of internalising and giving meaning to the new organisational values and norms of a comprehensive university. Needless to say, the challenges facing the newly merged NMMU are cultural, structural and geographic. Bringing together different institutional and personal cultures involves a human dimension that needs to be nurtured by trying to form a coherent and cohesive organisation that is created from culturally diverse and uncomplementary institutions. Another challenge is bringing together different organisational structures, systems and programmes that are informed by different institutional cultures. Furthermore, the challenge of having multiple campuses that are geographically separated exacerbates the situation. Along with all these challenges, the NMMU has the task of constructing an integrated institutional identity through organisational forms and programme models that will embody the multiple functions that are typical of a comprehensive university. The aim of the current study was to explore how the meanings that academics assign to the notion of a comprehensive university are instrumental in constructing an organisational identity; describing in detail how at the NMMU academics make meaning of the comprehensive university and how that meaning-making process influences the construction of an organisational identity; and formulating recommendations based on the qualitative findings and quantitative results of the research. In an effort to achieve the aim alluded to above, this study employed the mixed methods approach that used a sequential, exploratory, transformative design. The complexity of the study was such that it required to be investigated through qualitative and quantitative analytical methods in order to confirm, triangulate and obtain a holistic picture of the situation under investigation. The sample for the qualitative interviews consisted of thirteen purposefully selected academics from all levels at the NMMU. The interviews were transcribed and coded into themes, categories and sub-categories. These themes were then developed and translated into statements for the questionnaire that was administered randomly to all NMMU academics. A total of 108 academics responded to the questionnaire. The responses to the questionnaire were analysed using the SPSS programme. The findings and results of the study revealed that there was a fairly common understanding of the term comprehensive university among academics. However, the details about its procedures appeared to be the privileged ownership of management. This situation mitigated the necessity for a sense-making process that would allow for negotiation, modification and alteration of already held assumptions. A pertinent concern amongst academics was the neglect of the ‘human factor’ during the change process. The management style also came under scrutiny, especially in terms of the facilitation and mediation of change. There was a consensus on the call for cohesion and unity that was believed to be one of the main features that would make the construction of the NMMU organisational identity possible. The vision, mission and values of the NMMU were believed to be central to the creation of cohesion and unity, which would subsequently result in the birth of an organisational culture that could inform the organisational identity of the NMMU. Strategies to actualise and realise the organisational identity were proposed by participants. Notwithstanding, the impact of the merger was identified as having a major influence in shaping the organisational identity of the NMMU.
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  • Date Issued: 2009

A critical realist account of a mentoring programme in the Faculty of Pharmacy at Rhodes University

  • Authors: Oltmann, Carmen
  • Date: 2009
  • Subjects: Rhodes University -- Academic Development Programme Pharmacy -- Study and teaching (Higher) -- South Africa Mentoring in education -- South Africa Mentoring in Science -- South Africa Critical realism Communities of practice
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:3781 , http://hdl.handle.net/10962/d1003259
  • Description: This study originates from experiences I had as supervisor of the mentoring programme for first year students in the Faculty of Pharmacy, at Rhodes University. Our mentoring programme is a strategy for first year students – specifically those from previously disadvantaged backgrounds – to succeed at Rhodes University. Using an ontological meta-theory - critical realism - as my analytical lens, discourse as my unit of analysis, and Invitational Learning Theory as a theoretical tool I developed a model of mentoring based on Bhaskar’s transformational model (1993). This model illustrates the relationship between structure, culture and agency. Whilst developing this model I focussed on determining how mentors construct mentoring, and how mentoring facilitates access to a Community of Practice (CoP). Mentoring involves providing a shared space that is safe, that the mentor and mentee feel comfortable in, and that supports and challenges both the mentor and the mentee. It is a reciprocal, developmental relationship for both the mentor and the mentee that deals with issues that the mentee deems as ‘real’. Mentoring is a process, not an outcome. The mentoring strategies that the mentors employed changed as the mentors mentored. Mentors help mentees by using structures and mechanisms that worked for them, and/or by helping mentees access these structures and mechanisms. Mentoring facilitates access to a CoP by providing opportunities for engagement. This involves sharing of experiences and knowledge, and promoting discussion. The mentor helps the mentee move from being a peripheral member of the CoP to becoming a main member, i.e., becoming active, learning with and from others within the CoP. CoPs develop social capital and knowledge management. My research suggests that the knowledge, skills and attitude developed by the mentors within this study may be transferable to other aspects in Pharmacy.
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  • Date Issued: 2009

A knowledge-oriented, context-sensitive architectural framework for service deployment in marginalized rural communities

  • Authors: Thinyane, Mamello P
  • Date: 2009
  • Subjects: Information technology Expert systems (Computer science) Software architecture User interfaces (Computer systems) Ethnoscience Social networks Rural development Technical assistance -- Developing countries Information networks -- Developing countries
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4599 , http://hdl.handle.net/10962/d1004843
  • Description: The notion of a global knowledge society is somewhat of a misnomer due to the fact that large portions of the global community are not participants in this global knowledge society which is driven, shaped by and socio-technically biased towards a small fraction of the global population. Information and Communication Technology (ICT) is culture-sensitive and this is a dynamic that is largely ignored in the majority of ICT for Development (ICT4D) interventions, leading to the technological determinism flaw and ultimately a failure of the undertaken projects. The deployment of ICT solutions, in particular in the context of ICT4D, must be informed by the cultural and socio-technical profile of the deployment environments and solutions themselves must be developed with a focus towards context-sensitivity and ethnocentricity. In this thesis, we investigate the viability of a software architectural framework for the development of ICT solutions that are context-sensitive and ethnocentric1, and so aligned with the cultural and social dynamics within the environment of deployment. The conceptual framework, named PIASK, defines five tiers (presentation, interaction, access, social networking, and knowledge base) which allow for: behavioural completeness of the layer components; a modular and functionally decoupled architecture; and the flexibility to situate and contextualize the developed applications along the dimensions of the User Interface (UI), interaction modalities, usage metaphors, underlying Indigenous Knowledge (IK), and access protocols. We have developed a proof-of-concept service platform, called KnowNet, based on the PIASK architecture. KnowNet is built around the knowledge base layer, which consists of domain ontologies that encapsulate the knowledge in the platform, with an intrinsic flexibility to access secondary knowledge repositories. The domain ontologies constructed (as examples) are for the provisioning of eServices to support societal activities (e.g. commerce, health, agriculture, medicine) within a rural and marginalized area of Dwesa, in the Eastern Cape province of South Africa. The social networking layer allows for situating the platform within the local social systems. Heterogeneity of user profiles and multiplicity of end-user devices are handled through the access and the presentation components, and the service logic is implemented by the interaction components. This services platform validates the PIASK architecture for end-to-end provisioning of multi-modal, heterogeneous, ontology-based services. The development of KnowNet was informed on one hand by the latest trends within service architectures, semantic web technologies and social applications, and on the other hand by the context consideration based on the profile (IK systems dynamics, infrastructure, usability requirements) of the Dwesa community. The realization of the service platform is based on the JADE Multi-Agent System (MAS), and this shows the applicability and adequacy of MAS’s for service deployment in a rural context, at the same time providing key advantages such as platform fault-tolerance, robustness and flexibility. While the context of conceptualization of PIASK and the implementation of KnowNet is that of rurality and of ICT4D, the applicability of the architecture extends to other similarly heterogeneous and context-sensitive domains. KnowNet has been validated for functional and technical adequacy, and we have also undertaken an initial prevalidation for social context sensitivity. We observe that the five tier PIASK architecture provides an adequate framework for developing context-sensitive and ethnocentric software: by functionally separating and making explicit the social networking and access tier components, while still maintaining the traditional separation of presentation, business logic and data components.
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  • Date Issued: 2009

A model for evaluating training and development initiatives in the Botswana public service

  • Authors: Tshukudu, Theophilus Tebetso
  • Date: 2009
  • Subjects: Civil service -- Personnel management -- Botswana , Civil service -- Labor productivity -- Botswana , Civil service -- Botswana -- Evaluation , Employees -- Training of , Public administration
  • Language: English
  • Type: Thesis , Doctoral , DTech
  • Identifier: vital:9384 , http://hdl.handle.net/10948/879 , Civil service -- Personnel management -- Botswana , Civil service -- Labor productivity -- Botswana , Civil service -- Botswana -- Evaluation , Employees -- Training of , Public administration
  • Description: The purpose of this study was to develop an integrated model for evaluating training and development initiatives used by the Botswana public service. To achieve this goal, the following actions were taken: A literature study was conducted to identify the scope and impact of an effective training and development initiative and its evaluation; A literature study was conducted to identify strategies for evaluating training and development initiatives. The theoretical study focused on effective training and development strategies and their evaluation and critical organisational factors that contribute to successful training evaluation; The findings from the literature study were integrated into a model for evaluating training and development initiatives to be used by the Botswana public service; and  This model was used as the basis for the development of a survey questionnaire to determine whether trainers, training managers and supervisors who were responsible for training and development in the public service agreed with the effective strategies for evaluating training and development developed in the study. The survey was conducted in ministries and departments in the south east district of Botswana, mainly in Gaborone, where ministries and government departments are located. The empirical results from the study showed that the majority of respondents’ training and development activities were not evaluated and that there is no link between training and development and performance management. In particular, disagreements were shown with regard to ten strategies and critical organisational factors. Evaluation of training and development in general, is an issue that organisations are challenged with on a daily basis. Lack of skills by trainers on how to evaluate training and development is one major contributing factor to this problem. An integrated and strategic approach towards the evaluation of training and development is required to effectively and constructively train and development employees according to strategic organisational goals, rather than according to individual trainee’s goals.
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  • Date Issued: 2009

A new light on the pre-colonial history of South-East Africa, where the 'Other' is the European and the 'Silence' has a voice, based on evidence from shipwreck survivor narratives 1552-1782

  • Authors: Vernon, Gillian Noël
  • Date: 2009
  • Subjects: Shipwrecks -- South Africa -- History Shipwrecks -- Mozambique -- Personal narratives
  • Language: English
  • Type: Thesis , Doctoral , PhD (History)
  • Identifier: http://hdl.handle.net/10353/7930 , vital:30924
  • Description: The aim of this dissertation is to extract information from shipwreck survivor narratives, which will add to the known body of knowledge of the pre-colonial history of Southern Africa during the years 1552 to 1782. The discourse analysis focuses on the voice of the African peoples where the Europeans are the 'Strangers', the 'Other', reversing the view that the people of non-European cultures were termed as the 'Other'. Indigenous inhabitants of south-east Africa, south of Kosi Bay, first encountered Europeans in 1552 when a Portuguese ship was wrecked at present-day Port Edward. Subsequently, eight more Portuguese ships were wrecked between Plettenberg Bay and Kosi Bay between the years 1554 to 1647. Two Dutch ships landed on the shore, one south of the Bay of Natal in 1686, and the other being wrecked near the mouth of the Keiskamma River in 1713. There were also two English ships, with one striking the rocks on Bird Island in Algoa Bay in 1755 and the other, the more famous Grosvenor of 1782, coming aground at Lambazi Bay, north of the Mzimvubu River. The survivor groups were large, varying in size from 72 to 500, and most included a large complements of slaves. The survivors of the Portuguese ships made their way to present-day Mozambique where the Portuguese had trading outposts. The survivors of the Dutch ships, as well as those of the Grosvenor tried, with limited success, to make their way to Cape Town. The survivors from two of the Portuguese wrecks and the English group on Bird Island, constructed small ships and managed to sail away.
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  • Date Issued: 2009

A public-private partnership model for the improvemnet of local economic development in South African metropolitan government

  • Authors: Binza, Mzikayise Shakespeare
  • Date: 2009
  • Subjects: Economic development -- South Africa , Public-private sector cooperation -- South Africa , South Africa -- Economic conditions
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: vital:8159 , http://hdl.handle.net/10948/923 , Economic development -- South Africa , Public-private sector cooperation -- South Africa , South Africa -- Economic conditions
  • Description: The post-apartheid developmental state of South Africa had a challenge of turning around an economy that was on deficit which it inherited in 1994, to a positive growth that will be sustainable and shared. The process followed in creating a sustainable economic development was first establishing a constitutional democratic government which was constituted in terms of the provisions of the Constitution of the Republic of South Africa, 1996, as three equal spheres of government, viz: the national, provincial and local spheres of government. Initiatives on innovative economic development become a reconstruction programme not only of the national and provincial spheres of government, but also of the local sphere of government which is closest to the people it governs and deliver municipal goods and services to. For an example, section 152 (1) (c) of the Constitution of the Republic of South Africa, 1996, provides that the local sphere of government which is constituted by 283 wall-to-wall municipalities must “improve social and economic development” of the people. Out of the 283 municipalities, 6 are metropolitan municipalities, and are the: City of Cape Town, City of Johannesburg, City of Tshwane, Ekurhuleni, Ethekwini, and Nelson Mandela Bay Municipality. This research project is limited to the City of Cape Town (CCT) and the Nelson Mandela Bay Municipalities (NMBM). In the second process, a number of legislations and policies providing for external mechanisms to be used to improve local economic development (LED) in an inclusive, shared and equitable manner were introduced. Policies that were introduced by the democratic government and serve as policy directive for economic development are: the Reconstruction and Development Programme (RDP) of 1994; the Growth, Employment and Redistribution (GEAR) of 1996; and the Accelerated and Shared Growth Initiative of South Africa (ASGISA) of 2006. The relevant legislations to the local sphere of government which were introduced and provided for the appropriate mechanism for enabling sustainable growth of local economies by developmental local government in partnerships with other stakeholders such as private sector and civil society movements are: the Local Government: Municipal Systems Act, 2000 (Act 32 of 2000); Municipal Service Policy of 2000; Guidelines on Municipal Service Partnerships of 2006-2010; and the National Framework for Local Economic Development in South Africa (NFLED) of 2006-2010. The above xviii legislations provide the following external mechanisms to improve local economic development in municipal areas, viz: public-private partnerships; public-public partnerships, and public-community partnerships. This research project is about the first external mechanism which is the public-private partnerships (PPPs) to enable municipalities to improve local economies that provide for job creations and employment for the local inhabitants. According to the National Treasury Regulation 16 (2004:1), PPP means a “commercial transaction between an institution, for example a metropolitan government, and a private party in terms of which: 1. The private party either performs an institutional function on behalf of the institution [in this regard a metropolitan government] for a specified or indefinite period or acquires the use of a state property for its own commercial purposes for a specified or indefinite period. 2. The private party receives a benefit for performing the function or by utilising state property, either by way of compensation from a revenue fund, or by charges or fees collected by the private party from users or customers of a service provided for them; or a combination of such compensation and such fees”. The first goal of this research project is to develop the most appropriate public-private partnership model for South African metropolitan government with special reference to the City of Cape Town (CCT) and the Nelson Mandela Bay Municipality (NMBM) in enabling and guiding them to improve and sustain local economic development (LED) in their respective areas of jurisdiction. The application of public-private partnerships (PPPs) as a policy strategy to achieve local economic development (LED) in CCT and NMBM was investigated, in order to determine whether these activities can be improved. Followed is the development of a conceptual framework for optimal PPP implementation in order to improve local economic development in the CCT and NMBM and other metropolitan and municipal areas in South Africa. A more appropriate PPP model called the Participatory Development Systems Model (PDSM) has been constructed for this purpose from a number of sources and proven good practices both locally in South Africa and internationally. The PDSM model uses the strategic prioritisation and management by a municipality of the integrated development of physical, economic, human and social capital in its region in a more participatory way, as a point of departure for PPPs. The PDSM model for PPPs also emphasises consistent systematic assessment of these strategies against the strategic LED goals of the municipality concerned in order to ensure that lessons are learnt from these experiences and used to refine or revise future LED and PPP strategies accordingly. This thesis makes an original contribution to the existing body of knowledge about the promotion of LED through PPPs in metropolitan municipalities in South Africa and elsewhere, by conceptualising PPPs in a clear and coherent way as an integrated dimension of strategic management processes in municipalities that need to be implemented in a more participatory way in order to achieve the overall strategic goal of sustainable LED.
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  • Date Issued: 2009

A systems approach to mainstreaming environment and sustainability in universities : the case of Rhodes University, South Africa

  • Authors: Togo, Muchaiteyi
  • Date: 2009
  • Subjects: Rhodes University Education, Higher -- South Africa Universities and colleges -- South Africa Universities and colleges -- Environmental aspects -- South Africa -- Case studies Environmental education -- South Africa -- Case studies Sustainable development -- South Africa -- Case studies
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4768 , http://hdl.handle.net/10962/d1007175
  • Description: This study is influenced by the objectives of the Mainstreaming Environment and Sustainability in African Universities Partnership which aims to enhance the quality and relevance of university education through implementation of Environmental Education and sustainability across university functions and operations. It contributes to Education for Sustainable Development through the development of tools to assess sustainability in higher education, investigating sustainability practices in universities and proposing strategies for improving mainstreaming of sustainability. It also contributes to systems approaches in mainstreaming contextual sustainability challenges in university functions and operations. The aim of the study was to investigate how universities can mainstream sustainability in their functions and operations in response to contextual sustainability challenges in a changing environment using a systems approach. The research was a case study of Rhodes University in South Africa, which is situated in the impoverished Eastern Cape Province. The study involved 12 teaching departments (representing all faculties at the university), four research units and institutes, five managements units, the Estates Division and the Student Representative Council. The theoretical framework of the study draws from a critical realist ontology and systems thinking epistemology. Systems thinking emphasises the interdependencies of phenomena, thus providing the methodology and tools for a systems view of relationships between education and the environmental context in which it is embedded. Critical realism was employed as an underlabourer to systems thinking as it provides for some of the dimensions absent in systems thinking including its depth ontology which facilitates isolating causal factors influencing empirical reality. It recognises that explanation of phenomena can be embedded in history and acknowledges the fallibility of knowledge. The data collection methods employed in the study include a sustainability assessment using a Unit-based Sustainability Assessment Tool developed as part of the study, interviews, content analyses and observations. Data analyses were performed through employing morphogenetic analysis, and inductive, abductive and retroductive modes of inference. The morphogenetic analysis of social transformation/reproduction was employed to trace the historical emergence of sustainability initiatives at Rhodes University. Induction facilitated reorganisation of the data into themes which particularly represent the main sustainability activities at Rhodes University. Abduction, through recontextualising data in a systems thinking framework, enabled further insights into the phenomena. In the study, it enabled use of systems lenses as a framework and led to identification of systemic issues affecting mainstreaming and later, the development of systems thinking approaches in mainstreaming sustainability. Retroduction enabled identification of causal mechanisms which influenced the emergence of sustainability initiatives at the university. The study established that the emergence of sustainability initiatives at Rhodes University followed the 1990 Talloires Declaration and paralleled international institutional developments in relation to environmental and sustainability challenges. Since then, sustainability initiatives have continuously been emerging in various operational dimensions of the university in line with emerging sustainability challenges which resulted in a morphogenetic cycle. The study revealed that Rhodes University has mainstreamed sustainability across the functions and operations of most of the departments/divisions/units forming part of the study, especially in functions like teaching, research, community engagement and operations. There were a few exceptions like the Human Resources Division and to an extent the Research Office/Management Division which are not yet considering sustainability in their operations. While most of the teaching departments had sustainability initiatives in teaching, research and community engagement, there was diversity in the dimension(s) of sustainable development that the departments addressed and this seemed to relate to the disciplinary content of their subjects. In the Estates Division sustainability initiatives included sustainable landscaping, campus environmental management, water and energy conservation initiatives, waste recycling, use of biodiesel, to mention a few. Students were also involved in various sustainability activities especially through voluntary community engagement initiatives. Sustainability initiatives at the university were also discovered to be embedded within and responding to sustainability challenges of the immediate university environment of Makana District. The study unearthed the causal mechanisms enabling and constraining mainstreaming activities at the university. These were found to be embedded in the history and context within which the university is operating, and other factors related to university structures and agency of lecturers, other employees and students. Examples of these factors are unsustainable patterns in society, policies and the need to redress past inequalities. The study noted the existence of systemic issues at the university which need to be addressed to enable and enhance the promotion of a systems approach to mainstreaming: notably, complexity owing to diversity of approaches employed in mainstreaming, the absence of clearly defined university sustainability goals, problems of institutional support and in some cases, disciplinary governing rules which do not leave room for mainstreaming sustainability. The study established the possibility of improving mainstreaming of sustainability through the adoption of more explicit systems approaches. It suggests use of systems models including the systems-environment model, the functions/structure model and the motion picture model in the process. It recommends making the goal of mainstreaming more upfront, developing a shared understanding of sustainability and mapping out/defining contextual sustainable development issues to grapple with. The study also recommends adopting a holistic approach in mainstreaming, making it a campus-wide initiative, involving all students and developing interdisciplinary curricula. It suggests setting up of supporting mechanisms to strengthen, extend and spearhead mainstreaming and enhancement of collaborative work in sustainable development issues.
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  • Date Issued: 2009

Access to credit and the effect of credit constraints on household welfare in the Eastern Cape province, South Africa

  • Authors: Baiyegunhi, Lloyd-James Segun
  • Date: 2009
  • Subjects: Rural poor -- South Africa -- Eastern Cape , Households -- Economic aspects -- South Africa -- Eastern Cape , Investments -- South Africa -- Eastern Cape , Finance -- South Africa -- Eastern Cape , Credit -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Doctoral , PhD (Agricultural Economics)
  • Identifier: vital:11153 , http://hdl.handle.net/10353/d1000977 , Rural poor -- South Africa -- Eastern Cape , Households -- Economic aspects -- South Africa -- Eastern Cape , Investments -- South Africa -- Eastern Cape , Finance -- South Africa -- Eastern Cape , Credit -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape
  • Description: In recent years, concern about food safety linked to health issues has seen a rise in private food safety standards in addition to the regulations set by the Food and Agriculture Organisation (FAO) in collaboration with the World Health Organisation (WHO). These have presented challenges to producers and exporters of agricultural food products especially the producers of fresh fruits and vegetables. In spite of the food safety-linked challenges from the demand side, the vast range of business-environment forces pose equally formidable challenges that negatively impact on the exporting industries’ ability to maintain or improve their market shares and their ability to compete in world markets. The objective of this study was therefore to establish the competitiveness of the South African citrus industry in the international markets within this prevailing scenario. Due to the diversity of the definitions of competitiveness as a concept, this study formulated the following working definition: “the ability to create, deliver and maintain value and constant market share through strategic management of the industrial environment or competitiveness drivers”. This was based on the understanding that the international market shares of an industry are a function of forces in the business environment which range from intra-industry, external and national as well as the international elements. The unit of analysis were the citrus producers engaged in export of their products and the study made use of 151 responses by producers. The study adopted a five-step approach to the analysis of the performance of the South African citrus industry in the global markets, starting with the analysis of the Constant Market Share (CMS) of the South African citrus industry in various world markets, establishing the impact of the business environmental factors upon competitiveness, establishing the costs of compliance with private food safety standards, determining the non-price benefits of compliance with the standards, as well as highlighting the strategies for enhancing long-term competitiveness of the industry in the international markets. South Africa is one of the top three countries dominating the citrus fruit export market. Since its entry into the citrus fruit exports market in the 1900s, the industry has sustained its activity in the international market. The Constant Market Share Analysis shows that, amidst the challenges on the international market side, and the changes in the business environment, over much of which the industry has limited control and influence, the industry has maintained its competitive advantage in several markets. The CMS shows that South Africa’s lemons are competitive in America. Despite a negative trend, the South African grapefruit has been competitive in France, Greece, Italy, the Netherlands and Spain. Oranges have been competitive in the Greece, Italy, Portugal, UK, Asian and Northern Europe markets. Competitiveness in these markets has been due to the inherent competitiveness of the industry. Competitiveness in such markets as the Middle East has been attributed to the relatively rapid growth of these markets. The South African citrus industry has similarly undergone many major processes of transformation. The business environmental factors influencing its performance have ranged reform to the challenges beyond the country’s borders. These factors directly and indirectly affect the performance of the industry in the export market. They have influenced the flow of fruits into different international destinations. Of major concern are the food safety and private standards. Challenges in traditional markets as well as opportunities presented by demand from newly emerging citrus consuming nations have seen a diversification in the marketing of the South African citrus. The intensity of competition in the global market is reflected by the fluctuations in the market shares in different markets as well as the increase and fluctuations of fruit rejection rates in some lucrative markets such as America. A combination of challenging national environmental forces and stringent demand conditions negatively impact on revenues especially from markets characterised by price competitiveness. This study identified cost of production, foreign market support systems, adaptability, worker skills, challenges of management in an international environment and government policies such as labour and trade policies as some of the most influential obstacles to competitiveness. Some of the most competiveness-enhancing factors were market availability, market size, market information, market growth and the availability of research institutions. However, compliance with private standards still poses a challenge to the exporters. The different performance levels of the industry in various markets prove the dissimilarity of the demand conditions in the global market. These are supported by the negative influence associated with the foreign market support regimes as well as the challenges associated with compliance with private food safety standards. While market availability, market growth, market information and size were identified as enhancing competitiveness, the fluctuations and inconsistencies in the competitiveness of the industry in different foreign markets require more than finding markets. Resource allocation by both the government and the industry may need to take into account the off-setting of the national challenges and support of farmers faced with distorted and unfair international playing fields. Otherwise, market availability is not a challenge for the industry save meeting the specifications therewith as well as price competitiveness which is unattainable for the South African citrus producers faced with high production costs. For the purposes of further study, it is recommended that account should be taken of all the products marketed by the industry (including processed products such as fruit juices) in order to have a whole picture of the competitiveness of the industry in the international market. This study also proffers a new theoretical framework for the analysis of the business environment for the citrus industry and other agro-businesses. This framework takes into account the indispensability of the food safety standards and measures as well as the diversity of the global consumer and the non-negotiability of food trade for the sustenance of the growing population.
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  • Date Issued: 2009

Advances in platinum-amine chemotherapeutic agents : their chemistry and applicationc

  • Authors: Jaganath, Yatish
  • Date: 2009
  • Subjects: Coordination compounds , Antineoplastic antibiotics , Cancer -- Chemotherapy
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:10446 , http://hdl.handle.net/10948/d1021222
  • Description: The research conducted in this study focussed on advancing the knowledge database of diamineplatinum complexes on two frontiers: 1) the development of novel anticancer complexes, and 2) improvements in their synthetic chemistry. Novel square-planar dichloro and oxalato platinum(II) complexes were synthesized as potential anticancer agents in accordance with a comprehensive set of factors identified as being significant in optimizing such action. The nonleaving ligands consisted of asymmetric chelating chiral diamines of the form 1- (1-R-imidazol-2yl)(R')methanamine (R representing methyl, butyl and R' methyl, phenyl). The complexes were characterized by a host of spectral, thermal and crystallographic techniques. In addition, the stabilities of the complexes were monitored in aqueous and saline solutions. Cytotoxicity screening on three cultured cancer cell lines (MCF-7, HeLa and HT29) indicated the compounds, present as their respective racemates, to have rather modest activities relative to cisplatin; with complexes having the smallest substituents, R,R' = methyl, being most active. In recognition of the limitations of traditional silver-based syntheses of oxalatoplatinum(II) complexes, innovative non-silver methods were developed using the well known cancer drug, oxaliplatin, (trans-R,R-1,2- diaminocyclohexane)oxalatoplatinum(II), as a prototype. These involved direct ligand exchange reactions of the dichloro precursor, (trans-R,R-1,2- diaminocyclohexane)dichloroplatinum(II), with tetrabutylammonium oxalate in essentially non-aqueous solvents. A 90:10 mixture of isoamyl alcohol (3-methyl- 1-butanol):water, proved to be a promising solvent, enabling the recovery of pure oxaliplatin (~98 percent) after 9 hours at 88 °C in yields of up to 86 percent. In light of the perceived unique mode of anticancer action available to mononitroplatinum(IV) complexes (i.e. their STAT3-binding potential), octahedral diamineoxalatoplatinum(IV) complexes containing axially-coordinated nitro and halo co-ligands were synthesized and extensively characterized. Electrochemical studies revealed trends in reduction potential which could be correlated to structural / chemical traits of the coordinated diamine and axial ligands. The similarities of the determined cytotoxicities of the platinum(IV) compounds and their respective platinum(II) analogues, implicated reduction as a means of activation of the platinum(IV) complexes.
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  • Date Issued: 2009

An analysis of perceptions and attitudes to the study of IsiXhosa at tertiary level: NMMU a case study

  • Authors: Somhlahlo, Ruby Xoliswa
  • Date: 2009
  • Subjects: Nelson Mandela Metropolitan University -- Students -- Attitudes , Xhosa language -- Study and teaching (Higher) -- South Africa -- Port Elizabeth , Language and education -- South Africa
  • Language: English
  • Type: Thesis , Doctoral , DLitt
  • Identifier: vital:8461 , http://hdl.handle.net/10948/863 , Nelson Mandela Metropolitan University -- Students -- Attitudes , Xhosa language -- Study and teaching (Higher) -- South Africa -- Port Elizabeth , Language and education -- South Africa
  • Description: This study is about the analysis of perceptions and attitudes concerning the study of isiXhosa at tertiary level Nelson Mandela Metropolitan University (NMMU) in Port Elizabeth. The objective of this study is to investigate negative attitudes of African students with special reference to isiXhosa. Chapter One looks at the objectives of the research, the research problem, and its theoretical framework, as well as the literature review, the significance of the study, the research methods and definition of terms. Chapter Two deals with language planning and the current negative attitudes towards African languages, with special reference to isiXhosa. Chapter Three deals with status planning, the teaching of isiXhosa, language maintenance and multilingual education policy. Chapter Four discusses corpus planning, the role that Xhosa educators and students should play in the development of the language. Chapter Five discusses acquisition planning, the attitudes towards isiXhosa language and the maintenance of the language. Chapter Six concludes the study by presenting the summary and recommendations for the future research.
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  • Date Issued: 2009

An anthropological study of witchcraft-related crime in the Eastern Cape and its implications for law enforcment policy and practice

  • Authors: Petrus, Theodore Stephen
  • Date: 2009
  • Subjects: Witchcraft -- South Africa -- Transkei , Witchcraft -- Law and legislation -- Eastern Cape -- South Africa
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: vital:16145 , http://hdl.handle.net/10948/898 , Witchcraft -- South Africa -- Transkei , Witchcraft -- Law and legislation -- Eastern Cape -- South Africa
  • Description: This research sought to investigate the phenomenon of witchcraft-related crime in the Eastern Cape Province of South Africa, and its implications for law enforcement policy and practice. The primary motivation for a study such as this emerged from the need to address the lack of academic knowledge about witchcraft-related crime, especially in the Eastern Cape. The study is anthropological in focus, and is thus based on anthropological techniques of data gathering. Specifically, a literature study and fieldwork (semi-structured interviews and case studies) formed the basis of the research methodology employed. The geographical focus of the study was the northeastern part of the former Transkei, an area commonly referred to as Pondoland. Interview data were obtained from two categories of informants, namely community informants and informants of the South African Police Service (SAPS). Various towns and their surrounding villages were visited during fieldwork in order to gather data through interviews. Witchcraft continues to play an integral role in the cultural interpretation of misfortune, illness and untimely or mysterious death, particularly among local Xhosa-speaking communities that are predominantly rural. Beliefs associated with witchcraft were widespread in the study area and this was linked to high frequencies of witchcraft accusations and witchcraft-related violence. Police investigations of witchcraft-related cases were, for the most part, evaluated negatively by the majority of local community informants, while the SAPS informants indicated mixed responses as to the success of their investigations of these cases. The high frequency of unreported cases suggested that witchcraft-related crime is a problem in the Eastern Cape and that the local police were struggling to deal with these cases. The traditional leadership in various communities also struggled with the problem of an ambiguity in their role regarding witchcraft cases. Traditional leaders not only had jurisdictional limitations, but also indirectly seemed to encourage witchcraft-related violence by punishing those who accused others of witchcraft. In general, the relationship between communities, traditional leaders and the police were strained by witchcraft-related cases.
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  • Date Issued: 2009

An examination of language planning and policy in the Eastern Cape with specific reference to Sesotho : a sociolinguistic study

  • Authors: Nakin, Rosalia Moroesi
  • Date: 2009
  • Subjects: Language planning -- South Africa -- Eastern Cape , Language policy -- South Africa -- Eastern Cape , Sociolinguistics
  • Language: English
  • Type: Thesis , Doctoral , DLitt
  • Identifier: vital:8459 , http://hdl.handle.net/10948/1020 , Language planning -- South Africa -- Eastern Cape , Language policy -- South Africa -- Eastern Cape , Sociolinguistics
  • Description: This sociolinguistic study examines issues of corpus, status and acquisition in Language Planning in Sesotho and isiXhosa in the Eastern Cape. Language plays an important role in the lives of its speakers in society as they interact. Chapter 1 of this study provides the background, definitions of terms used, the objective of the study, the statement of the problem, the research methods used and the literature reviewed. Chapter 2 addresses the context, orientations, stages, and frameworks or types of language planning. Corpus planning forms an integral part of this study. This chapter also looks at different ways of developing terminology. Lastly, the chapter discusses the relationship between corpus planning and purism. Chapter 3 provides the other two types or frameworks of language planning namely, status and acquisition planning. Goals of language planning, and variables for language planning are also discussed in chapter 3. Chapter 4 looks at principles of language planning. Chapter 5 deals with the Language-in-Education Policy, the Eastern Cape Provincial Language Policy Framework, language attitudes and responses to language planning and language policy. Chapter 6 presents the findings and challenges facing the development and use of African languages one of which is Sesotho, as prescribed in the Constitution of the country. A few suggestions and different approaches towards language awareness campaigns are presented in this chapter. Lastly, this chapter concludes the study.
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  • Date Issued: 2009

An institutional analysis of community and home based care and support for HIV/AIDS sufferers in rural households in Malawi

  • Authors: Munthali, Spy Mbiriyawaka
  • Date: 2009
  • Subjects: AIDS (Disease) -- Patients -- Care -- Malawi HIV-positive persons -- Care -- Malawi HIV infections -- Malawi Home-based family services -- Malawi Community health services -- Malawi Community development -- Malawi Economic development -- Malawi
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:985 , http://hdl.handle.net/10962/d1002719
  • Description: Standard economic models often emphasize inputs, outputs and an examination of the structures in order to conduct an economic performance evaluation. This study applies the Institutional and Development Framework (IAD) in the broader context of New Institutional Economics (NIE) in order to examine the transaction costs of delivering Community and Home Based Care and Support (CHBC) to HIV/AIDS sufferers. For purposes of unveiling the empirical reality guiding decision making processes in the CHBC service delivery, comparative qualitative research techniques of normative variable and concept formation have been adopted to draw out the relative institutional influences from the HIV/AIDS national response partnerships. The study identifies the conflict between the predominantly standardized and more rigid formal management techniques adopted by key members of the national response and the informal cultural techniques familiar to the rural communities, and a lack of motivational incentives in the CHBC structures as the key factors against CHBC capacities to draw external funding for service delivery. CHBCs are also weakened by incoherent governance structures at the district level for facilitation of funding and information flow exacerbating the community vulnerability. Rationalization of the institutional arrangements and a clarification of roles from district to community levels, a shift of focus to facilitation of informal techniques and an integration of performance enhancing incentives are the critical policy insights envisaged to spur CHBCs to work better.
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  • Date Issued: 2009

An investigation into the role of school-governing bodies with reference to the Kuyasa Secondary School, King William's Town District

  • Authors: Radoni, Bonisile Wellington
  • Date: 2009
  • Subjects: School boards -- South Africa -- King Williams Town , School personnel management -- South Africa -- King Williams Town , School management and organization -- South Africa -- King Williams Town
  • Language: English
  • Type: Thesis , Doctoral , DPA
  • Identifier: vital:8206 , http://hdl.handle.net/10948/1164 , School boards -- South Africa -- King Williams Town , School personnel management -- South Africa -- King Williams Town , School management and organization -- South Africa -- King Williams Town
  • Description: The introduction of school governing bodies provided communities with an opportunity to play a significant role in the organisation and governance of their schools. This involvement of significant stakeholders is purported to oversee that schools offer education of high quality to the learners. However, school governance is a legal responsibility, which requires the skills, knowledge and expertise to ensure that SGB members will be able to fulfil their concomitant legal duties. The aim of the study was to investigate the impact of the SGBs role in school governance in Kuyasa Secondary School, King Williams Town District. The findings revealed that the SGBs knowledge and understanding of their roles and responsibilities, and the type of training they receive have a marked effect on their functionality. There is also a need to recruit SGB members with a particular level of education, knowledge, understanding and expertise to minimise the chances of failure.
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  • Date Issued: 2009

An investigation into the use of guidelines and patterns in the interaction design process

  • Authors: Cowley, Niel Lester Orr
  • Date: 2009
  • Subjects: Human-computer interaction , Web sites -- Design , User interfaces (Computer systems) -- Design
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:10466 , http://hdl.handle.net/10948/1062 , Human-computer interaction , Web sites -- Design , User interfaces (Computer systems) -- Design
  • Description: Design guidelines are used in interaction design (IxD) for physical design and for evaluating the usability of designs and interactive products. Guidelines are widely used for physical design and evaluation, but have a number of problems. IxD patterns have been proposed as an alternative to guidelines, as they are claimed to have several advantages over guidelines. A small number of empirical studies provide evidence that patterns are beneficial when used in IxD. Additional research on the usefulness of IxD patterns is required. The primary research question investigated in this thesis was thus: How useful are IxD patterns as physical design and evaluation aids in IxD, as compared to design guidelines? The role of guidelines and patterns as design and evaluation aids in IxD was investigated and a comparison of guidelines and patterns, based on a set of guideline and pattern properties, was conducted. The concept of pattern and guideline usefulness was explored and a research agenda for guidelines and patterns was identified, together with a set of research questions for an empirical study. The empirical study of the use of patterns for evaluation, redesign and new design, as compared to guidelines, was conducted at the Nelson Mandela Metropolitan University in 2004. The participants were a purposive sample of post-graduate Computing students, who were regarded as novice interaction designers. Two equivalent groups were formed, one that used patterns and one that used guidelines. Patterns were found to be as useful as guidelines when used as evaluation aids. Guidelines and patterns were identified as effective tools for identifying and explaining usability issues and design features. Best-effort matched sets of guidelines and patterns produced substantially different result sets when used to identify issues and features, with fairly low overlap. A substantial evaluator effect was observed for the use of guidelines and patterns for evaluation, and the results obtained were similar to those obtained by Molich et al. in their Comparative Usability Evaluation (CUE) studies. There was no statistically significant difference between the effectiveness of guidelines and patterns for evaluation. There was also no statistically significant difference between the perceived efficiency, effectiveness and satisfaction in use of guidelines and patterns for evaluation. Guidelines and patterns were found to be used in similar ways for evaluation. Patterns were found to be more effective than guidelines for redesign. Patterns were found to be as useful as guidelines when used for new design. There was no statistically significant difference between the effectiveness of guidelines and patterns for new design. There was also no statistically significant difference between the perceived efficiency, effectiveness and satisfaction in use of guidelines and patterns for redesign and new design. Guidelines and patterns were found to be used in similar ways for design. There was no statistically significant difference between the perceived usefulness of the format, content, ease of learning, and usefulness as personal and shared design languages, of guidelines and patterns. Both participant groups were equally agreeable to using guidelines and patterns in the future. The perceived usefulness of pattern collections was found to depend on the usability of the collection interface and the content quality of the patterns. The results of the empirical study thus provided empirical evidence that patterns were as useful as guidelines for evaluation and new design, and were perceived as positively as guidelines were. Patterns were found to be superior to guidelines for redesign. Patterns can therefore be used with a measure of confidence as early stage design aids for physical design and evaluation in the future. In addition to these findings, a number of opportunities for further research were identified.
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  • Date Issued: 2009

Application of Baylis-Hillman methodology in the construction of complex heterocyclic targets

  • Authors: Ganto, Mlungiseleli MacDonald
  • Date: 2009
  • Subjects: Heterocyclic compounds -- Derivatives Heterocyclic chemistry
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4401 , http://hdl.handle.net/10962/d1006703
  • Description: Baylis-Hillman reactions using various aromatic aldehydes, activated alkenes and catalysts have been used to: - access an extensive range of poly-heterocyclic products;explore chemoselectivity; and optimise reaction efficiency. Chromone-3-carbaldehydes and chromone-2-carbaldehydes, prepared via Vielsmeier-Haack and Kostanecki-Robinson methodology, respectively, have been used as Baylis-Hillman substrates with four different catalysts, viz., 1,4-diazabicyclo[2.2.2]octane (DABCO), 3-hydroxyquinuclidine (3-HQ), imidazole and N’,N’,N’,N’- tetramethylpropanediamine (TMPDA), and with methyl vinyl ketone (MVK), methyl acrylate, cyclic enones (2-cyclohexen-1-one, 2-cyclopenten-1-one and chromones) as activated alkenes. Reactions of the chromone- -carbaldehydes with MVK afforded dimeric Baylis-Hillman adducts when catalyzed by DABCO but when the same reactions were repeated using 3-HQ as catalyst, the dimeric products were accompanied by tricyclic Baylis-Hillman adducts. Use of excess MVK, however, led to mixtures of the normal Baylis-Hillman adducts and the tricyclic adducts – interestingly, with the apparent absence of the dimeric products. While reactions of chromone-3-carbaldehydes with methyl acrylate afforded the normal Baylis-Hillman adducts, the chromone-2- carbaldehydes produced, instead, rearrangement products, consistent with an earlier, single observation. Reactions of 2-nitrobenzaldehydes with cyclic enones using imidazole as catalyst afforded the normal Baylis-Hillman adducts, reductive cyclisation of the 2-cyclohexen-1- one and 2-cyclopenten-1-one adducts, using acetic acid and iron powder, afforded the corresponding quinoline erivatives. Treatment of cyclic enones with pyridine-2-carbaldehydes and quinoline-2-carbaldehydes using TMPDA as catalyst generally gave the expected Baylis-Hillman adducts. However, indolizine derivatives were isolated directly from Baylis-Hillman reactions involving pyridine-2-carbaldehydes and 2-cyclohexen-1-one. The remaining Baylis-Hillman adducts were cyclized to the corresponding indolizines by treatment with acetic anhydride both under reflux and under microwave-assisted conditions, the latter approach providing remarkably rapid and efficient access to the polycyclic products. Computer modelling studies have been conducted on selected polycyclic products at the Molecular Mechanics (MM), Quantum Mechanical (QM) and Density Functional (DFT) levels. The theoretical results have been used to calculate UV, IR and NMR absorption data, which have been compared, in turn, with the experimental spectroscopic data. Use has also been made of the estreNova NMR prediction programme and, generally, good agreement has been observed between the predicted and experimental spectroscopic data.
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  • Date Issued: 2009

Aspects of the ecology and biology of the isopod, Exosphaeroma hylocoetes, (Barnard, 1940) in three temporarily open/closed southern African estuaries

  • Authors: Henninger, Tony Oskar
  • Date: 2009
  • Subjects: Estuaries -- South Africa -- Eastern Cape Estuarine ecology -- South Africa -- Eastern Cape Isopoda -- South Africa -- Eastern Cape Estuarine biology -- South Africa -- Eastern Cape Ruppia maritima
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5640 , http://hdl.handle.net/10962/d1005322
  • Description: Temporarily open/closed estuaries (TOCE’s) are the numerically dominant type of estuary accounting for ≈ 70 % of all estuaries along the South African coastline. Despite their numerical dominance, aspects of the biology of organisms within these systems, particularly macrocrustacea remain poorly understood. This study firstly assessed the abundance and biomass of the most common isopod, Exosphaeroma hylocoetes, in three Eastern Cape TOCE’s, (the West Kleinemonde, East Kleinemonde and Kasouga Estuaries), and their response to mouth breaching events. This study was followed by aspects of the biology of the isopod including their utilisation of submerged macrophytes as a refuge from predation and/or possible food source, as well as the growth rates of the isopods in the laboratory under different environmental conditions. Mean isopod abundances and biomasses ranged between 0 and 4 791 ind. m⁻² and 0 and 9.65 mg dwt. m⁻² in the West Kleinemonde Estuary and between 0 and 108 ind. m⁻² and 0 and 0.318 mg dwt. m⁻² in the nearby East Kleinemonde Estuary. In the Kasouga Estuary, the values ranged between 0 and 3 650 ind. m⁻² and 0 and 5.105 mg dwt. m⁻². Temporal and spatial changes in the abundance and biomass of E. hylocoetes within the three systems was primarily linked to mouth phase, with populations declining when the mouth was open and to a lesser extent, seasonality. In all three estuaries maximum isopod abundances and biomasses were recorded in their middle and upper reaches, which could be ascribed to the presence of submerged macrophytes particularly Ruppia maritima, in two of the estuaries. Males (5.71 ± 0.41 mm) were significantly larger than females (3.99 ± 0.26 mm), but the sex ratios were skewed in favour of females, (a common feature in many isopod populations). Females were found carrying brood throughout the study, releasing offspring directly into the water column, to allow recruitment to the populations. The larger the female, the larger the brood carried (up to a maximum of 72 embryo/mancas). Results of laboratory experiments indicate that the close association of Exosphaeroma hylocoetes with submerged macrophytes is a result of the plant stands providing a refuge against predation by selected ichthyofauna. However stable carbon isotope and fatty acid analyses indicate that E. hylocoetes made use of ephiphytic algae and detritus on the stems of R. maritima, rather than the submerged macrophyte itself. There were no significant differences in the growth rates of male and female isopods at combinations of temperature (15 and 25 °C) and salinity (15 and 35 ‰). Laboratory growth studies revealed that males lived longer than females (25.77 ± 3.40 weeks vs 21.52 ± 3.00 weeks), and therefore achieved larger overall size. Females, however, reached sexual maturity (at 2.5 mm) at a faster rate (two to four weeks) than males (5.5 mm after 6.5 to 11 weeks), dependent on temperature. Exosphaeroma hylocoetes with its association with submerged macrophytes, early maturity, its growth rates and longevity, female-biased sex ratios and year-round breeding, all contribute to its success in temporary open/closed estuaries.
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  • Date Issued: 2009

Automating the conversion of natural language fiction to multi-modal 3D animated virtual environments

  • Authors: Glass, Kevin Robert
  • Date: 2009
  • Subjects: Virtual computer systems , Virtual storage (Computer science) , Virtual reality , Computer animation , Fiction -- Computer programs , Narration (Rhetoric) -- Computer simulation , Animation (Cinematography) , Natural language processing (Computer Science)
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4632 , http://hdl.handle.net/10962/d1006518
  • Description: Popular fiction books describe rich visual environments that contain characters, objects, and behaviour. This research develops automated processes for converting text sourced from fiction books into animated virtual environments and multi-modal films. This involves the analysis of unrestricted natural language fiction to identify appropriate visual descriptions, and the interpretation of the identified descriptions for constructing animated 3D virtual environments. The goal of the text analysis stage is the creation of annotated fiction text, which identifies visual descriptions in a structured manner. A hierarchical rule-based learning system is created that induces patterns from example annotations provided by a human, and uses these for the creation of additional annotations. Patterns are expressed as tree structures that abstract the input text on different levels according to structural (token, sentence) and syntactic (parts-of-speech, syntactic function) categories. Patterns are generalized using pair-wise merging, where dissimilar sub-trees are replaced with wild-cards. The result is a small set of generalized patterns that are able to create correct annotations. A set of generalized patterns represents a model of an annotator's mental process regarding a particular annotation category. Annotated text is interpreted automatically for constructing detailed scene descriptions. This includes identifying which scenes to visualize, and identifying the contents and behaviour in each scene. Entity behaviour in a 3D virtual environment is formulated using time-based constraints that are automatically derived from annotations. Constraints are expressed as non-linear symbolic functions that restrict the trajectories of a pair of entities over a continuous interval of time. Solutions to these constraints specify precise behaviour. We create an innovative quantified constraint optimizer for locating sound solutions, which uses interval arithmetic for treating time and space as contiguous quantities. This optimization method uses a technique of constraint relaxation and tightening that allows solution approximations to be located where constraint systems are inconsistent (an ability not previously explored in interval-based quantified constraint solving). 3D virtual environments are populated by automatically selecting geometric models or procedural geometry-creation methods from a library. 3D models are animated according to trajectories derived from constraint solutions. The final animated film is sequenced using a range of modalities including animated 3D graphics, textual subtitles, audio narrations, and foleys. Hierarchical rule-based learning is evaluated over a range of annotation categories. Models are induced for different categories of annotation without modifying the core learning algorithms, and these models are shown to be applicable to different types of books. Models are induced automatically with accuracies ranging between 51.4% and 90.4%, depending on the category. We show that models are refined if further examples are provided, and this supports a boot-strapping process for training the learning mechanism. The task of interpreting annotated fiction text and populating 3D virtual environments is successfully automated using our described techniques. Detailed scene descriptions are created accurately, where between 83% and 96% of the automatically generated descriptions require no manual modification (depending on the type of description). The interval-based quantified constraint optimizer fully automates the behaviour specification process. Sample animated multi-modal 3D films are created using extracts from fiction books that are unrestricted in terms of complexity or subject matter (unlike existing text-to-graphics systems). These examples demonstrate that: behaviour is visualized that corresponds to the descriptions in the original text; appropriate geometry is selected (or created) for visualizing entities in each scene; sequences of scenes are created for a film-like presentation of the story; and that multiple modalities are combined to create a coherent multi-modal representation of the fiction text. This research demonstrates that visual descriptions in fiction text can be automatically identified, and that these descriptions can be converted into corresponding animated virtual environments. Unlike existing text-to-graphics systems, we describe techniques that function over unrestricted natural language text and perform the conversion process without the need for manually constructed repositories of world knowledge. This enables the rapid production of animated 3D virtual environments, allowing the human designer to focus on creative aspects.
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  • Date Issued: 2009

Bare life in the Bantustans (of the Eastern Cape): re-membering the centinnial South African nation-state

  • Authors: Westaway, Ashley
  • Date: 2009
  • Subjects: Democracy -- South Africa , Homelands (South Africa) , Apartheid -- South Africa , Right of property -- South Africa
  • Language: English
  • Type: Thesis , Doctoral , PhD (History)
  • Identifier: vital:11535 , http://hdl.handle.net/10353/149 , Democracy -- South Africa , Homelands (South Africa) , Apartheid -- South Africa , Right of property -- South Africa
  • Description: This thesis argues that 1994 did not mark a point of absolute discontinuity in the history of South Africa. More specifically, it asserts that 1994 did not signal the end of segregationism; instead of democracy leading to national integration, the Bantustans are still governed and managed differently from the rest of the country. Consequently, it is no surprise that they remain mired in pervasive, debilitating poverty fifteen years after 1994. In insisting that contemporary South Africa is old (rather than new), the thesis seeks to make a contribution to political struggles that aim to bring to an end the segregationist past-in-the-present. The thesis is arranged in seven chapters. The first chapter considers the crisis that has engulfed South Africa historiography since 1994. It traces the roots of the crisis back to some of the fundamentals of the discipline of history, such as empiricism, neutrality and historicism. It suggests that the way to end the crisis, to re-assert the relevance of history, is for historians to re-invoke the practice of producing histories of the present, in an interested, deliberate manner. Chapter 2 narrows down the focus of the thesis to (past and present) property. It suggests that instead of understanding the constitutional protection of property rights and installation of a restitution process as the product of a compromise between adversarial negotiators, these outcomes are more correctly understood as emanating from consensus. The third chapter outlines the implementation of the restitution programme from 1994 to 2008. The productive value of restitution over this period is found not in what it has delivered to the claimants (supposedly the beneficiaries of the programme), but rather in its discursive effects related to citizenship in the new South Africa. Chapter 4 considers the exclusion of dispossession that was implemented in the Bantustans from the restitution programme. It argues that this decision was not an oversight on the part of the post-1994 government. Instead it was consistent with all other key policy decisions taken in the recent period. The Bantustans have been treated differently from the rest of South Africa; they have been deliberately under-developed, fabricated as welfare zones, and subjected to arbitrary customary rule. Whereas Chapters 2 to 4 look at the production of historical truth on the side of domination, Chapter 6 and 7 consider production on the side of resistance. Specifically, they describe and analyse the attempts of an NGO to establish the truths of betterment as dispossession, and post-1994 prejudice against the victims of betterment dispossession. They serve as case studies of third party-led processes that seek to produce truth-effects from within a prevailing truth regime. The final chapter attempts to bring many of the threads that weave through the thesis together, by means of a critical consideration of human rights discourse. The chapter calls on intellectuals to establish truths in relation to the history of ongoing human wrongs in South Africa (as opposed to the rainbow narrative of human rights) Finally, the thesis includes a postscript, comprising technical summaries of each of the chapters.
  • Full Text:
  • Date Issued: 2009
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