A model for information security control audit for small to mid-sized organisations
- Authors: Deysel, Natasha
- Date: 2009
- Subjects: Data protection , Computer networks -- Information technology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9760 , http://hdl.handle.net/10948/940 , Data protection , Computer networks -- Information technology
- Description: Organisations are increasingly dependent on their information. Compromise to this information in terms of loss, inaccuracy or competitors gaining unauthorised access could have devastating consequences for the organisation. Therefore, information security governance has become a major concern for all organisations, large and small. Information security governance is based on a set of policies and internal controls by which organisations direct and manage their information security. An effective information security governance programme should be based on a recognised framework, such as the Control Objectives for Information and related Technology (COBIT). COBIT focuses on what control objectives must be achieved in order to effectively manage the information technology environment. It has become very clear that if a company is serious about information security governance, it needs to apply the COBIT framework that deals with information security. The problem in some medium-sized organisations is that they do not realise the importance of information security governance and are either unaware of the risks or choose to ignore these risks as they do not have the expertise or resources available to provide them with assurance that they have the right information security controls in place to protect their organisation against threats.
- Full Text:
- Date Issued: 2009
- Authors: Deysel, Natasha
- Date: 2009
- Subjects: Data protection , Computer networks -- Information technology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9760 , http://hdl.handle.net/10948/940 , Data protection , Computer networks -- Information technology
- Description: Organisations are increasingly dependent on their information. Compromise to this information in terms of loss, inaccuracy or competitors gaining unauthorised access could have devastating consequences for the organisation. Therefore, information security governance has become a major concern for all organisations, large and small. Information security governance is based on a set of policies and internal controls by which organisations direct and manage their information security. An effective information security governance programme should be based on a recognised framework, such as the Control Objectives for Information and related Technology (COBIT). COBIT focuses on what control objectives must be achieved in order to effectively manage the information technology environment. It has become very clear that if a company is serious about information security governance, it needs to apply the COBIT framework that deals with information security. The problem in some medium-sized organisations is that they do not realise the importance of information security governance and are either unaware of the risks or choose to ignore these risks as they do not have the expertise or resources available to provide them with assurance that they have the right information security controls in place to protect their organisation against threats.
- Full Text:
- Date Issued: 2009
A model for user requirements elicitation specific to users in rural areas
- Authors: Isabirye, Naomi
- Date: 2009
- Subjects: Internet marketing , Electronic commerce , Land reform -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Rural poor -- South Africa -- Eastern Cape , Information resources management
- Language: English
- Type: Thesis , Masters , MCom (Information Systems)
- Identifier: vital:11130 , http://hdl.handle.net/10353/145 , Internet marketing , Electronic commerce , Land reform -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Rural poor -- South Africa -- Eastern Cape , Information resources management
- Description: Dwesa is a rural town situated in South Africa's Eastern Cape Province that has been selected as a testing site for an e-commerce project to address some of the challenges faced by the community. These challenges include difficulties stemming from poverty, poor access to public services, unemployment and low levels of literacy. The Siyakhula Living Lab project’s aim is to develop an e-commerce platform that will 'connect' the residents with the necessary access to services and markets by providing them with the necessary tools that can help in alleviating some of their challenges. In order for the project to achieve its objectives, a deeper understanding into the needs of the prospective users is required. User requirements elicitation deals with the process of interacting with the prospective users to understand and document their needs. This research aims at evaluating existing requirements elicitation techniques and methodologies in the context of rural information technology implementations. The primary objective is to develop a model for user requirements elicitation in Dwesa. Many requirements elicitation techniques and frameworks exist, but few have been evaluated in the context of rural software implementations. Requirements elicitation techniques should not be applied simply as steps to gather information. Instead this research project proposes a model that can be applied to assimilate the contribution of knowledge regarding the stakeholders, problem and solution characteristics, and other characteristics into the software development process for the effective elicitation of requirements.
- Full Text:
- Date Issued: 2009
- Authors: Isabirye, Naomi
- Date: 2009
- Subjects: Internet marketing , Electronic commerce , Land reform -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Rural poor -- South Africa -- Eastern Cape , Information resources management
- Language: English
- Type: Thesis , Masters , MCom (Information Systems)
- Identifier: vital:11130 , http://hdl.handle.net/10353/145 , Internet marketing , Electronic commerce , Land reform -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Rural poor -- South Africa -- Eastern Cape , Information resources management
- Description: Dwesa is a rural town situated in South Africa's Eastern Cape Province that has been selected as a testing site for an e-commerce project to address some of the challenges faced by the community. These challenges include difficulties stemming from poverty, poor access to public services, unemployment and low levels of literacy. The Siyakhula Living Lab project’s aim is to develop an e-commerce platform that will 'connect' the residents with the necessary access to services and markets by providing them with the necessary tools that can help in alleviating some of their challenges. In order for the project to achieve its objectives, a deeper understanding into the needs of the prospective users is required. User requirements elicitation deals with the process of interacting with the prospective users to understand and document their needs. This research aims at evaluating existing requirements elicitation techniques and methodologies in the context of rural information technology implementations. The primary objective is to develop a model for user requirements elicitation in Dwesa. Many requirements elicitation techniques and frameworks exist, but few have been evaluated in the context of rural software implementations. Requirements elicitation techniques should not be applied simply as steps to gather information. Instead this research project proposes a model that can be applied to assimilate the contribution of knowledge regarding the stakeholders, problem and solution characteristics, and other characteristics into the software development process for the effective elicitation of requirements.
- Full Text:
- Date Issued: 2009
A model to improve relations between management of the Eastern Cape provincial legislature and national education health and allied workers union (NEHAWU)
- Authors: Mosana, Nombulelo Pascaline
- Date: 2009
- Subjects: Employee-management relations in government -- South Africa , Employment relations -- South Africa , Labor unions -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8255 , http://hdl.handle.net/10948/1026 , Employee-management relations in government -- South Africa , Employment relations -- South Africa , Labor unions -- South Africa
- Description: This study seeks to generate a model that will give rise to improved working relations between the management of the Eastern Cape Provincial Legislature and NEHAWU. In the community of the Eastern Cape Provincial Legislature there are perceptions that management and NEHAWU do not trust each other. Based on the above, the main aim of the study therefore is to investigate the truth or falsehood of the perceptions mentioned above and to generate a model. As Punch (1993:37) explains, the researcher provides the hypothesis which is the predicted answer to the research question or problem identified in the study. The formulated hypothesis in this study is that “the application of a model to improve working relations will result in improved working relations between management of the Eastern Cape Provincial Legislature and NEHAWU”. Findings revealed in the answers received from respondents prove the accuracy of the hypothesis. The methodological framework used in this investigation is the qualitative research. Winberg (1997:411) states that in using the qualitative research approach, the researcher looks at people within a specific context. An appropriate research design selected for this research project is the empirical study that utilises the primary data sourced through a survey. A v survey has been conducted targeting different respondents in the legislature community. Findings reveal that in order to improve working relations an enabling environment in the ECPL should be created. Effective and user friendly systems and standard operating procedures should be put in place. Findings also reveal that interaction between management and the union takes place mainly around bargaining issues. Managament and NEHAWU do not trust each other and as a result of that relations are poor. Again, findings reveal a strong support by management and NEHAWU for the development of a “model to improve relations between management of the Eastern Cape Provincial Legislature and NEHAWU”. After analysing and interpreting the findings, the study recommends a model that will help improve working relations between management and NEHAWU. The proposed integrated model deals with institutional strategy that is informed by national policies and legislations, structure (inclusive of MPLs, management and the labour union), systems and standard operating procedures and cultural re-invigoration. Central to this model is an effort to build a team with a common purpose. The model recognises the importance of inter-relation and inter-dependency of its various elements in order to build a successful organization and to cultivate good corporate governance.
- Full Text:
- Date Issued: 2009
- Authors: Mosana, Nombulelo Pascaline
- Date: 2009
- Subjects: Employee-management relations in government -- South Africa , Employment relations -- South Africa , Labor unions -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8255 , http://hdl.handle.net/10948/1026 , Employee-management relations in government -- South Africa , Employment relations -- South Africa , Labor unions -- South Africa
- Description: This study seeks to generate a model that will give rise to improved working relations between the management of the Eastern Cape Provincial Legislature and NEHAWU. In the community of the Eastern Cape Provincial Legislature there are perceptions that management and NEHAWU do not trust each other. Based on the above, the main aim of the study therefore is to investigate the truth or falsehood of the perceptions mentioned above and to generate a model. As Punch (1993:37) explains, the researcher provides the hypothesis which is the predicted answer to the research question or problem identified in the study. The formulated hypothesis in this study is that “the application of a model to improve working relations will result in improved working relations between management of the Eastern Cape Provincial Legislature and NEHAWU”. Findings revealed in the answers received from respondents prove the accuracy of the hypothesis. The methodological framework used in this investigation is the qualitative research. Winberg (1997:411) states that in using the qualitative research approach, the researcher looks at people within a specific context. An appropriate research design selected for this research project is the empirical study that utilises the primary data sourced through a survey. A v survey has been conducted targeting different respondents in the legislature community. Findings reveal that in order to improve working relations an enabling environment in the ECPL should be created. Effective and user friendly systems and standard operating procedures should be put in place. Findings also reveal that interaction between management and the union takes place mainly around bargaining issues. Managament and NEHAWU do not trust each other and as a result of that relations are poor. Again, findings reveal a strong support by management and NEHAWU for the development of a “model to improve relations between management of the Eastern Cape Provincial Legislature and NEHAWU”. After analysing and interpreting the findings, the study recommends a model that will help improve working relations between management and NEHAWU. The proposed integrated model deals with institutional strategy that is informed by national policies and legislations, structure (inclusive of MPLs, management and the labour union), systems and standard operating procedures and cultural re-invigoration. Central to this model is an effort to build a team with a common purpose. The model recognises the importance of inter-relation and inter-dependency of its various elements in order to build a successful organization and to cultivate good corporate governance.
- Full Text:
- Date Issued: 2009
A model to measure the maturuty of smartphone security at software consultancies
- Authors: Allam, Sean
- Date: 2009
- Subjects: Computer networks -- Security measures , Capability maturity model (Computer software) , Smartphones , Wireless Internet , Mobile communication systems , Mobile computing
- Language: English
- Type: Thesis , Masters , MCom (Information Systems)
- Identifier: vital:11135 , http://hdl.handle.net/10353/281 , Computer networks -- Security measures , Capability maturity model (Computer software) , Smartphones , Wireless Internet , Mobile communication systems , Mobile computing
- Description: Smartphones are proliferating into the workplace at an ever-increasing rate, similarly the threats that they pose is increasing. In an era of constant connectivity and availability, information is freed up of constraints of time and place. This research project delves into the risks introduced by smartphones, and through multiple cases studies, a maturity measurement model is formulated. The model is based on recommendations from two leading information security frameworks, the COBIT 4.1 framework and ISO27002 code of practice. Ultimately, a combination of smartphone specific risks are integrated with key control recommendations, in providing a set of key measurable security maturity components. The subjective opinions of case study respondents are considered a key component in achieving a solution. The solution addresses the concerns of not only policy makers, but also the employees subjected to the security policies. Nurturing security awareness into organisational culture through reinforcement and employee acceptance is highlighted in this research project. Software consultancies can use this model to mitigate risks, while harnessing the potential strategic advantages of mobile computing through smartphone devices. In addition, this research project identifies the critical components of a smartphone security solution. As a result, a model is provided for software consultancies due to the intense reliance on information within these types of organisations. The model can be effectively applied to any information intensive organisation.
- Full Text:
- Date Issued: 2009
- Authors: Allam, Sean
- Date: 2009
- Subjects: Computer networks -- Security measures , Capability maturity model (Computer software) , Smartphones , Wireless Internet , Mobile communication systems , Mobile computing
- Language: English
- Type: Thesis , Masters , MCom (Information Systems)
- Identifier: vital:11135 , http://hdl.handle.net/10353/281 , Computer networks -- Security measures , Capability maturity model (Computer software) , Smartphones , Wireless Internet , Mobile communication systems , Mobile computing
- Description: Smartphones are proliferating into the workplace at an ever-increasing rate, similarly the threats that they pose is increasing. In an era of constant connectivity and availability, information is freed up of constraints of time and place. This research project delves into the risks introduced by smartphones, and through multiple cases studies, a maturity measurement model is formulated. The model is based on recommendations from two leading information security frameworks, the COBIT 4.1 framework and ISO27002 code of practice. Ultimately, a combination of smartphone specific risks are integrated with key control recommendations, in providing a set of key measurable security maturity components. The subjective opinions of case study respondents are considered a key component in achieving a solution. The solution addresses the concerns of not only policy makers, but also the employees subjected to the security policies. Nurturing security awareness into organisational culture through reinforcement and employee acceptance is highlighted in this research project. Software consultancies can use this model to mitigate risks, while harnessing the potential strategic advantages of mobile computing through smartphone devices. In addition, this research project identifies the critical components of a smartphone security solution. As a result, a model is provided for software consultancies due to the intense reliance on information within these types of organisations. The model can be effectively applied to any information intensive organisation.
- Full Text:
- Date Issued: 2009
A need analysis and the selection of a distribution channel for an imported meat product In South Africa
- Authors: Pintér, Judit Klementina
- Date: 2009
- Subjects: Meat industry and trade -- South Africa International trade
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/11832 , vital:26977
- Description: Owing to the increase in urbanisation and disposable income, South Africa offers the food industry enormous growth opportunities. According to Louw, Jordaan, Ndanga and Kirsten (2008: 287), supermarkets have become vital role players in South African food consumption. Within this market, it is especially important to note that “preferences for high quality… foods are emerging” (Louw et al, 2008:288). This highlights the need to introduce superior quality foods to the South African food market. This study took this need one step further by asking the question, “is there a need for a high-quality foreign product in the South African market?” The primary objective of this study was to conduct a needs analysis to determine whether there is a need to introduce a selected foreign product into the South African market. The high-quality product chosen for this research is a meat product called PICK salami. In addition, the distribution channel that would be the most appropriate for the possible introduction of the product to the market was also identified in the study. To accomplish this, a relevant literature study was performed. To realise the research objective, a triangulated research approach was selected and a multiple-case study conducted. The units of analysis chosen for this study were the four major South African supermarket chains: SPAR Group Limited, Shoprite Checkers, Woolworths (Pty) limited and Pick ’n Pay Retailers (Pty) Limited. The data from this study was then analysed to determine meaningful results. From the research, it was concluded that there is a need for a high-quality meat product such as PICK Salami in South Africa and that SPAR Group Limited is the most viable distribution channel to use. Both South Africa and Hungary can benefit from such a business venture as gaps in the market can be filled and both countries can profit, despite the current global economic downturn.
- Full Text:
- Date Issued: 2009
- Authors: Pintér, Judit Klementina
- Date: 2009
- Subjects: Meat industry and trade -- South Africa International trade
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/11832 , vital:26977
- Description: Owing to the increase in urbanisation and disposable income, South Africa offers the food industry enormous growth opportunities. According to Louw, Jordaan, Ndanga and Kirsten (2008: 287), supermarkets have become vital role players in South African food consumption. Within this market, it is especially important to note that “preferences for high quality… foods are emerging” (Louw et al, 2008:288). This highlights the need to introduce superior quality foods to the South African food market. This study took this need one step further by asking the question, “is there a need for a high-quality foreign product in the South African market?” The primary objective of this study was to conduct a needs analysis to determine whether there is a need to introduce a selected foreign product into the South African market. The high-quality product chosen for this research is a meat product called PICK salami. In addition, the distribution channel that would be the most appropriate for the possible introduction of the product to the market was also identified in the study. To accomplish this, a relevant literature study was performed. To realise the research objective, a triangulated research approach was selected and a multiple-case study conducted. The units of analysis chosen for this study were the four major South African supermarket chains: SPAR Group Limited, Shoprite Checkers, Woolworths (Pty) limited and Pick ’n Pay Retailers (Pty) Limited. The data from this study was then analysed to determine meaningful results. From the research, it was concluded that there is a need for a high-quality meat product such as PICK Salami in South Africa and that SPAR Group Limited is the most viable distribution channel to use. Both South Africa and Hungary can benefit from such a business venture as gaps in the market can be filled and both countries can profit, despite the current global economic downturn.
- Full Text:
- Date Issued: 2009
A needs analysis for the implementation of a complementary course in mathematics education for teachers of mathematics in Namibia: a case study
- Authors: Ilukena, Alex Mbonabi
- Date: 2009
- Subjects: Education -- Namibia -- Case studies Mathematics -- Study and teaching -- Namibia -- Case studies Mathematics teachers -- Training of -- Namibia -- Case studies Teacher educators -- Training of -- Case studies Teachers -- Training of -- Namibia -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1677 , http://hdl.handle.net/10962/d1003560
- Description: After the introduction of the Basic Education Teacher Diploma (BETD) in Namibia, a number of studies were conducted on how teachers, lecturers, stakeholders and the Namibian public perceived the BETD program and its implementation. However, very few studies focussed specifically on mathematics subject content knowledge and pedagogical content knowledge in the BETD. The purpose of this study was to investigate the need for a complementary course in mathematics education to address the lack of mathematical content and pedagogical knowledge in the Namibian BETD. The study involved five mathematics school teachers, two mathematics college lecturers in the Kavango educational region and a professor of mathematics education at the University of Namibia. These participants were purposefully selected because of their knowledge and experiences with various aspects of the BETD program. The motivation for conducting this study was to gain a better understanding of some of the issues that have been raised about the BETD program, particularly the perceived inadequacy of mathematical subject content and methodology since the inception of the program. The study adopts a qualitative approach in reporting participants’ reflections. The views of the focal educators and documents such as syllabi and course outlines were the main source of data. The findings indicate that despite the training that the three BETD mathematics graduates in this study received, the level of mathematics taught in a complementary course, such as an ACE, would clearly better equip mathematics teachers to teach proficiently and facilitate access to institutions of higher learning such as universities. The results of the study revealed that there was a need for the implementation of a complementary course to the BETD in mathematics education for teachers of mathematics in Namibia. This study also provided valuable insights into what such a course could look like.
- Full Text:
- Date Issued: 2009
- Authors: Ilukena, Alex Mbonabi
- Date: 2009
- Subjects: Education -- Namibia -- Case studies Mathematics -- Study and teaching -- Namibia -- Case studies Mathematics teachers -- Training of -- Namibia -- Case studies Teacher educators -- Training of -- Case studies Teachers -- Training of -- Namibia -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1677 , http://hdl.handle.net/10962/d1003560
- Description: After the introduction of the Basic Education Teacher Diploma (BETD) in Namibia, a number of studies were conducted on how teachers, lecturers, stakeholders and the Namibian public perceived the BETD program and its implementation. However, very few studies focussed specifically on mathematics subject content knowledge and pedagogical content knowledge in the BETD. The purpose of this study was to investigate the need for a complementary course in mathematics education to address the lack of mathematical content and pedagogical knowledge in the Namibian BETD. The study involved five mathematics school teachers, two mathematics college lecturers in the Kavango educational region and a professor of mathematics education at the University of Namibia. These participants were purposefully selected because of their knowledge and experiences with various aspects of the BETD program. The motivation for conducting this study was to gain a better understanding of some of the issues that have been raised about the BETD program, particularly the perceived inadequacy of mathematical subject content and methodology since the inception of the program. The study adopts a qualitative approach in reporting participants’ reflections. The views of the focal educators and documents such as syllabi and course outlines were the main source of data. The findings indicate that despite the training that the three BETD mathematics graduates in this study received, the level of mathematics taught in a complementary course, such as an ACE, would clearly better equip mathematics teachers to teach proficiently and facilitate access to institutions of higher learning such as universities. The results of the study revealed that there was a need for the implementation of a complementary course to the BETD in mathematics education for teachers of mathematics in Namibia. This study also provided valuable insights into what such a course could look like.
- Full Text:
- 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.
- Full Text:
- Date Issued: 2009
- 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.
- Full Text:
- Date Issued: 2009
A new species of Diplacanthus from the Late Devonian (Famennian) of South Africa
- Authors: Gess, Robert W
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/73873 , vital:30237 , https://doi.org/10.1016/S0753-3969(01)88002-2
- Description: An advanced diplacanthid (Climatiiformes) is described from a Famennian estuarine environment of South Africa. It is characterized by having exceptionally long thin fin spines and a deep body form. Unusual details of the fins and fin spine insertions are preserved. This is the first record of a diplacanthid from the Southern Hemisphere.
- Full Text: false
- Date Issued: 2009
- Authors: Gess, Robert W
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/73873 , vital:30237 , https://doi.org/10.1016/S0753-3969(01)88002-2
- Description: An advanced diplacanthid (Climatiiformes) is described from a Famennian estuarine environment of South Africa. It is characterized by having exceptionally long thin fin spines and a deep body form. Unusual details of the fins and fin spine insertions are preserved. This is the first record of a diplacanthid from the Southern Hemisphere.
- Full Text: false
- Date Issued: 2009
A picture's worth a thousand words: a case study of grade 10 English language educators teaching visual literacy
- Authors: Leask-Smith, Lyn Ann
- Date: 2009
- Subjects: Visual literacy -- Study and teaching (Secondary) -- Case studies English language -- Study and teaching (Secondary) -- Case studies Teacher educators -- Training of -- Case studies English teachers -- Training of -- Case studies Teachers -- In-service training
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1702 , http://hdl.handle.net/10962/d1003585
- Description: The aim of this research was to better understand teacher's beliefs about visual literacy and to explore how their beliefs influence their teaching practice. In order to investigate this, a case study was conducted that comprised of lesson observations and semi-structured interviews with two secondary school English home language educators. The backdrop to the research was the implementation of the new national curriculum for grade 10. The participants, though well educated and experienced teachers, felt their training had been inadequate in the area of teaching visual literacy and although they acknowledged the importance of visual literacy, it seemed to have a fairly low priority in their actual teaching practice. In particular, very little attention was given to the production of multimodal texts by learners. The reason for this low priority may be related to the requirements of the formal assessment programme as well as limited lesson time in which to cover an extensive curriculum. The research findings would seem to suggest a need for in-service training in this area as well as access to suitable learning support materials and teacher resources.
- Full Text:
- Date Issued: 2009
- Authors: Leask-Smith, Lyn Ann
- Date: 2009
- Subjects: Visual literacy -- Study and teaching (Secondary) -- Case studies English language -- Study and teaching (Secondary) -- Case studies Teacher educators -- Training of -- Case studies English teachers -- Training of -- Case studies Teachers -- In-service training
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1702 , http://hdl.handle.net/10962/d1003585
- Description: The aim of this research was to better understand teacher's beliefs about visual literacy and to explore how their beliefs influence their teaching practice. In order to investigate this, a case study was conducted that comprised of lesson observations and semi-structured interviews with two secondary school English home language educators. The backdrop to the research was the implementation of the new national curriculum for grade 10. The participants, though well educated and experienced teachers, felt their training had been inadequate in the area of teaching visual literacy and although they acknowledged the importance of visual literacy, it seemed to have a fairly low priority in their actual teaching practice. In particular, very little attention was given to the production of multimodal texts by learners. The reason for this low priority may be related to the requirements of the formal assessment programme as well as limited lesson time in which to cover an extensive curriculum. The research findings would seem to suggest a need for in-service training in this area as well as access to suitable learning support materials and teacher resources.
- Full Text:
- Date Issued: 2009
A potential biological role for microcystin in photosynthesis in Microcystis Aeruginosa
- Authors: Phelan, Richard Reginald
- Date: 2009
- Subjects: Microcystis aeruginosa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10320 , http://hdl.handle.net/10948/1285 , Microcystis aeruginosa
- Description: Neither the ecological role nor the metabolic function of microcystin is known. Cellular microcystin concentrations correlate to cellular nitrogen status for a given environmental phosphorous concentration and specific growth rate. Microcystin production is enhanced when the rate of nitrogen accumulation exceeds the relative specific growth rate and/or when cellular N:C ratios exceed the Redfield ratio as a function of reduced carbon fixation, suggesting enhanced production of microcystin under carbon stress. Additionally, a strong correlation between medium phosphate and carbon fixation, and the negative correlation between medium phosphate and microcystin combined with the cellular localization of microcystin in thylakoids supports a possible role for microcystin in enhancement of photosynthesis. Batch cultures of both Microcystis aeruginosa PCC7806 and a mcyA- knockout mutant of PCC7806 were therefore cultured at different light intensities and media treatments, so as to vary cellular N:C ratios and concentrations, and sampled for analysis of microcystin concentration, cell numbers and residual medium nitrates. Inter-strain differences in photosynthetic electron transfer rates and levels were monitored using a Hansatech PEA fluorometer and compared to cellular microcystin concentrations. An enhanced survival was observed at high light, where the toxic strain survived while the nontoxic strain became chlorotic. A strong correlation (r2 = 0.907, p< 0.001, N=22) between microcystin concentration and growth rate was observed at high light conditions. No such advantage was observed at optimal or low-light conditions and media composition had no significant effect on the relationship between toxicity and survival at high light. PCC7806 showed elevated PI(abs) values compared to the mcyA knockout strain, which indicates an increased stability of PSII. A strong correlation between PI(abs) and microcystin (r = 0.88, p< 0.005, N=15) was observed for cultures grown in modified BG11 containing 25 mM under continuous illumination of 37 μmol of photons m-2.s-1. No correlation was observed between PI(abs) and microcystin for the other treatments. The toxin producer had significantly higher values for density of active reaction centers and ii quantum efficiency compared to the mutant. A decrease in F0 in the mutant suggests degradation of the phycobiliproteins, whereas PCC7806 didn’t show a significant decrease in F0 Data indicate that microcystins play a role in photosynthesis by preventing chlorosis in saturating light conditions either by enhancing the redox stability of the phycobiliproteins or PS II, thus preventing photooxidation.
- Full Text:
- Date Issued: 2009
- Authors: Phelan, Richard Reginald
- Date: 2009
- Subjects: Microcystis aeruginosa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10320 , http://hdl.handle.net/10948/1285 , Microcystis aeruginosa
- Description: Neither the ecological role nor the metabolic function of microcystin is known. Cellular microcystin concentrations correlate to cellular nitrogen status for a given environmental phosphorous concentration and specific growth rate. Microcystin production is enhanced when the rate of nitrogen accumulation exceeds the relative specific growth rate and/or when cellular N:C ratios exceed the Redfield ratio as a function of reduced carbon fixation, suggesting enhanced production of microcystin under carbon stress. Additionally, a strong correlation between medium phosphate and carbon fixation, and the negative correlation between medium phosphate and microcystin combined with the cellular localization of microcystin in thylakoids supports a possible role for microcystin in enhancement of photosynthesis. Batch cultures of both Microcystis aeruginosa PCC7806 and a mcyA- knockout mutant of PCC7806 were therefore cultured at different light intensities and media treatments, so as to vary cellular N:C ratios and concentrations, and sampled for analysis of microcystin concentration, cell numbers and residual medium nitrates. Inter-strain differences in photosynthetic electron transfer rates and levels were monitored using a Hansatech PEA fluorometer and compared to cellular microcystin concentrations. An enhanced survival was observed at high light, where the toxic strain survived while the nontoxic strain became chlorotic. A strong correlation (r2 = 0.907, p< 0.001, N=22) between microcystin concentration and growth rate was observed at high light conditions. No such advantage was observed at optimal or low-light conditions and media composition had no significant effect on the relationship between toxicity and survival at high light. PCC7806 showed elevated PI(abs) values compared to the mcyA knockout strain, which indicates an increased stability of PSII. A strong correlation between PI(abs) and microcystin (r = 0.88, p< 0.005, N=15) was observed for cultures grown in modified BG11 containing 25 mM under continuous illumination of 37 μmol of photons m-2.s-1. No correlation was observed between PI(abs) and microcystin for the other treatments. The toxin producer had significantly higher values for density of active reaction centers and ii quantum efficiency compared to the mutant. A decrease in F0 in the mutant suggests degradation of the phycobiliproteins, whereas PCC7806 didn’t show a significant decrease in F0 Data indicate that microcystins play a role in photosynthesis by preventing chlorosis in saturating light conditions either by enhancing the redox stability of the phycobiliproteins or PS II, thus preventing photooxidation.
- Full Text:
- Date Issued: 2009
A preliminary investigation and photographic atlas of nodules found in the Bokkelveld group (Gydo formation), Steytlerville district, South Africa
- Authors: Browning, Claire
- Date: 2009
- Subjects: Gydo formation -- South Africa , Formations (Geology) -- South Africa -- Western Cape , Formations (Geology) -- South Africa -- Eastern Cape , Groups (Stratigraphy) -- South Africa -- Western Cape , Geology -- Stratigraphic , Bokkeveld group (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10656 , http://hdl.handle.net/10948/927 , Gydo formation -- South Africa , Formations (Geology) -- South Africa -- Western Cape , Formations (Geology) -- South Africa -- Eastern Cape , Groups (Stratigraphy) -- South Africa -- Western Cape , Geology -- Stratigraphic , Bokkeveld group (South Africa)
- Description: Nodules within the lower Bokkeveld shales often contain well-preserved invertebrate fossil material. The aim of this study was to describe some characteristics seen at various scales (macro-, micro- and ultra -) within nodules that might contribute to an understanding of aspects of nodule formation and the reasons for the excellent preservation of the fossil material within these nodules. Detailed, high quality macro-photographs were taken of sliced and whole nodule surfaces and a catalogue was produced to tentatively identify fossils present and illustrate the variations seen within nodules. Selected nodules were then subjected to petrographic, ultra-structural (SEM) and some chemical (EDS, XRD & XRF) analysis to investigate the possible reasons for these variations. The chemical results have indicated that nodules are enriched with quartz compared to the surrounding shale. Quartz is also the dominant mineral replacing trilobite carapace material within nodules, while trilobite material within shales is replaced with equal proportions of hematite, biotite and quartz. It appears that the higher resistance of quartz to weathering is the dominant factor leading to the preservation of both nodules within the shales and trilobite material within the nodules examined. A comparison with some Western Cape nodules highlighted possible variations in overall nodule chemical composition along strike. Western Cape nodules are predominantly composed of apatite whereas the Cockscomb nodules are mainly composed of quartz. This quartz-apatite compositional variation in nodules occurring within a single formation has been reported from nodules found in the Armorican Massif of France which are very similar in a number of respects to the Bokkeveld nodules described in this study. Based on various features of the fossils present and the structure of nodules they were probably formed during early diagenesis within an epeiric marine deposit greatly affected by sea level fluctuations.
- Full Text:
- Date Issued: 2009
- Authors: Browning, Claire
- Date: 2009
- Subjects: Gydo formation -- South Africa , Formations (Geology) -- South Africa -- Western Cape , Formations (Geology) -- South Africa -- Eastern Cape , Groups (Stratigraphy) -- South Africa -- Western Cape , Geology -- Stratigraphic , Bokkeveld group (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10656 , http://hdl.handle.net/10948/927 , Gydo formation -- South Africa , Formations (Geology) -- South Africa -- Western Cape , Formations (Geology) -- South Africa -- Eastern Cape , Groups (Stratigraphy) -- South Africa -- Western Cape , Geology -- Stratigraphic , Bokkeveld group (South Africa)
- Description: Nodules within the lower Bokkeveld shales often contain well-preserved invertebrate fossil material. The aim of this study was to describe some characteristics seen at various scales (macro-, micro- and ultra -) within nodules that might contribute to an understanding of aspects of nodule formation and the reasons for the excellent preservation of the fossil material within these nodules. Detailed, high quality macro-photographs were taken of sliced and whole nodule surfaces and a catalogue was produced to tentatively identify fossils present and illustrate the variations seen within nodules. Selected nodules were then subjected to petrographic, ultra-structural (SEM) and some chemical (EDS, XRD & XRF) analysis to investigate the possible reasons for these variations. The chemical results have indicated that nodules are enriched with quartz compared to the surrounding shale. Quartz is also the dominant mineral replacing trilobite carapace material within nodules, while trilobite material within shales is replaced with equal proportions of hematite, biotite and quartz. It appears that the higher resistance of quartz to weathering is the dominant factor leading to the preservation of both nodules within the shales and trilobite material within the nodules examined. A comparison with some Western Cape nodules highlighted possible variations in overall nodule chemical composition along strike. Western Cape nodules are predominantly composed of apatite whereas the Cockscomb nodules are mainly composed of quartz. This quartz-apatite compositional variation in nodules occurring within a single formation has been reported from nodules found in the Armorican Massif of France which are very similar in a number of respects to the Bokkeveld nodules described in this study. Based on various features of the fossils present and the structure of nodules they were probably formed during early diagenesis within an epeiric marine deposit greatly affected by sea level fluctuations.
- Full Text:
- Date Issued: 2009
A preliminary survey of the estuaries on the south coast of South Africa, Robberg Peninsula - Cape St Francis, with particular reference to the fish fauna : ecological overview article
- James, Nicola C, Harrison, T D
- Authors: James, Nicola C , Harrison, T D
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:7144 , http://hdl.handle.net/10962/d1011842
- Description: A basic ichthyofaunal and physico-chemical survey of the coastal outlets on the south coast of South Africa (Robberg Peninsula to Cape St Francis) was undertaken during November 1994 and September 1995. Some 27 systems were identified along this stretch of coast and of these, 48% (Brak, Helpmekaars, Klip, Witels, Geelhoutbos, Kleinbos, Bruglaagte, Langbos, Sanddrif, Eerste, Boskloof, Kaapsedrif and Klipdrif [Wes]) comprised the inlets of coastal streams that offer little habitat for fishes, 26% (Sout, Bloukrans, Lottering, Elandsbos, Storms, Elands and Groot [Oos]) are located within deeply incised valleys within the Tsitsikamma region and provide limited littoral habitat for estuary-associated fishes; 26% of the systems (Piesang, Keurbooms, Matjies, Groot [Wes], Tsitsikamma, Klipdrif [Oos], Slang) appear to serve some estuarine function for both marine migrant and resident species although some of these may also be limited due to their small size and infrequent connection with the sea. This study serves to emphasize the ecological importance of these latter estuaries within this coastal sector.
- Full Text:
- Date Issued: 2009
- Authors: James, Nicola C , Harrison, T D
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:7144 , http://hdl.handle.net/10962/d1011842
- Description: A basic ichthyofaunal and physico-chemical survey of the coastal outlets on the south coast of South Africa (Robberg Peninsula to Cape St Francis) was undertaken during November 1994 and September 1995. Some 27 systems were identified along this stretch of coast and of these, 48% (Brak, Helpmekaars, Klip, Witels, Geelhoutbos, Kleinbos, Bruglaagte, Langbos, Sanddrif, Eerste, Boskloof, Kaapsedrif and Klipdrif [Wes]) comprised the inlets of coastal streams that offer little habitat for fishes, 26% (Sout, Bloukrans, Lottering, Elandsbos, Storms, Elands and Groot [Oos]) are located within deeply incised valleys within the Tsitsikamma region and provide limited littoral habitat for estuary-associated fishes; 26% of the systems (Piesang, Keurbooms, Matjies, Groot [Wes], Tsitsikamma, Klipdrif [Oos], Slang) appear to serve some estuarine function for both marine migrant and resident species although some of these may also be limited due to their small size and infrequent connection with the sea. This study serves to emphasize the ecological importance of these latter estuaries within this coastal sector.
- Full Text:
- Date Issued: 2009
A proposed launch strategy of an aerosol spray automotive paint
- Authors: Msuthwana, Vusumzi Michael
- Date: 2009
- Subjects: New products -- South Africa -- Marketing , Marketing -- South Africa -- Technique , Aerosols
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8690 , http://hdl.handle.net/10948/1134 , New products -- South Africa -- Marketing , Marketing -- South Africa -- Technique , Aerosols
- Description: Launching a new product requires a creative and analytical approach that will embrace the needs of a variety of customers. Therefore the key to success, during the launch stage of a new product, lies in finding those customer segments which are most disposed to become early adopters. Once the new product has been launched and is widely accepted, the more conservative customers will be easier to sell to. This study proposes the launch strategy of an aerosol spray paint which is designed for the use in a DIY market of the automotive refinish segment. The study take a form of an assessment survey involving a literature review and a survey of managers and sales representatives of selected automotive dealerships and body repair shops. The literature review identified best practices that should be followed to launch a new product: starting with assessing the market potential of the new product, followed by a series of activities including pre-launch and then a full launch. The strategic marketing approach required to launch a new product is also described throughout the process. The empirical survey and research methodology employed in the study is described. This is followed by the survey questionnaire used for gathering the data needed for analysis. The research findings of the empirical survey are then analyzed and reported on. Various recommendations flowing from the results of the empirical study are presented in the final chapter.
- Full Text:
- Date Issued: 2009
- Authors: Msuthwana, Vusumzi Michael
- Date: 2009
- Subjects: New products -- South Africa -- Marketing , Marketing -- South Africa -- Technique , Aerosols
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8690 , http://hdl.handle.net/10948/1134 , New products -- South Africa -- Marketing , Marketing -- South Africa -- Technique , Aerosols
- Description: Launching a new product requires a creative and analytical approach that will embrace the needs of a variety of customers. Therefore the key to success, during the launch stage of a new product, lies in finding those customer segments which are most disposed to become early adopters. Once the new product has been launched and is widely accepted, the more conservative customers will be easier to sell to. This study proposes the launch strategy of an aerosol spray paint which is designed for the use in a DIY market of the automotive refinish segment. The study take a form of an assessment survey involving a literature review and a survey of managers and sales representatives of selected automotive dealerships and body repair shops. The literature review identified best practices that should be followed to launch a new product: starting with assessing the market potential of the new product, followed by a series of activities including pre-launch and then a full launch. The strategic marketing approach required to launch a new product is also described throughout the process. The empirical survey and research methodology employed in the study is described. This is followed by the survey questionnaire used for gathering the data needed for analysis. The research findings of the empirical survey are then analyzed and reported on. Various recommendations flowing from the results of the empirical study are presented in the final chapter.
- Full Text:
- Date Issued: 2009
A psychobiographical study of Helen Keller
- Van Genechten, Désirée Martina
- Authors: Van Genechten, Désirée Martina
- Date: 2009
- Subjects: Keller, Helen, 1880-1968 , Developmental psychology , Life cycle, Human -- Psychological aspects , Deafblind people
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9897 , http://hdl.handle.net/10948/1101 , Keller, Helen, 1880-1968 , Developmental psychology , Life cycle, Human -- Psychological aspects , Deafblind people
- Description: This psychobiographical study of Helen Keller’s life is exploratory-descriptive in nature. The subject was chosen through purposive sampling. The choice was based on the researcher’s personal interest and the remarkable impact this profoundly handicapped woman had within her society. Helen Keller also meets the psychobiographical requirements. These include that she is historically well known, inspirational, and her life has been completed. The study uses a qualitative, single case, interpretive research design. The design is employed to study Helen Keller’s entire life span within a formal psychological theory. The theory used in this study is Daniel Levinson’s (1996) Life Structure theory of adult development. Data for this study were collected from a variety of primary and secondary sources which provided alternative perspectives on her life. In addition, the data have been corroborated by historical texts, and newspaper and journal articles. Levinson’s (1996) theory divides the lifespan into four developmental eras, each with its own biopsychosocial character. Each era in turn is divided into shorter periods of development, each with particular developmental tasks. Cross-era transitions separate the eras. By describing and exploring the data according to this theory, Helen Keller as a profoundly handicapped person is shown to display universal patterns of development as suggested by Levinson. At the same time, the Life Structure she developed, her life components, and Satisfactoriness illuminated her uniqueness. Through the application of the theory to Helen Keller’s life, this psychobiographical study facilitated an examination of the theory. This led to suggestions for potential development of the theory.
- Full Text:
- Date Issued: 2009
- Authors: Van Genechten, Désirée Martina
- Date: 2009
- Subjects: Keller, Helen, 1880-1968 , Developmental psychology , Life cycle, Human -- Psychological aspects , Deafblind people
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9897 , http://hdl.handle.net/10948/1101 , Keller, Helen, 1880-1968 , Developmental psychology , Life cycle, Human -- Psychological aspects , Deafblind people
- Description: This psychobiographical study of Helen Keller’s life is exploratory-descriptive in nature. The subject was chosen through purposive sampling. The choice was based on the researcher’s personal interest and the remarkable impact this profoundly handicapped woman had within her society. Helen Keller also meets the psychobiographical requirements. These include that she is historically well known, inspirational, and her life has been completed. The study uses a qualitative, single case, interpretive research design. The design is employed to study Helen Keller’s entire life span within a formal psychological theory. The theory used in this study is Daniel Levinson’s (1996) Life Structure theory of adult development. Data for this study were collected from a variety of primary and secondary sources which provided alternative perspectives on her life. In addition, the data have been corroborated by historical texts, and newspaper and journal articles. Levinson’s (1996) theory divides the lifespan into four developmental eras, each with its own biopsychosocial character. Each era in turn is divided into shorter periods of development, each with particular developmental tasks. Cross-era transitions separate the eras. By describing and exploring the data according to this theory, Helen Keller as a profoundly handicapped person is shown to display universal patterns of development as suggested by Levinson. At the same time, the Life Structure she developed, her life components, and Satisfactoriness illuminated her uniqueness. Through the application of the theory to Helen Keller’s life, this psychobiographical study facilitated an examination of the theory. This led to suggestions for potential development of the theory.
- Full Text:
- Date Issued: 2009
A psychobiographical study of Isie Smuts
- Authors: Smuts, Carisa
- Date: 2009
- Subjects: Smuts, Isie K., 1870-1954 , Psychology -- Biographical methods , Developmental psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9913 , http://hdl.handle.net/10948/894 , Smuts, Isie K., 1870-1954 , Psychology -- Biographical methods , Developmental psychology
- Description: Psychobiographical research, with the use of psychological theory, allows us to uncover and unravel the life of an individual. This important area of research for the application of a psychological theory has, however, been under-utilized, especially in South Africa. The importance of psychobiographical case study research for the development and testing of theories of human development throughout the lifespan, has been supported by a number of academics in the field. The research subject was Sibella Margaretha (Isie) Krige. Isie (1870-1954) was married to General Jan Christiaan Smuts (1870-1950). He was a prominent South African and Commonwealth statesman, military leader, botanist and philosopher. Although much has been written on General Smuts, a psychobiography on the life of Isie had not been written yet. Isie was chosen as the research subject through purposive sampling. The study employed a qualitative psychobiographical research method, which aimed to explore and describe Isie’s psychological development in terms of Daniel Levinson’s (1996) theory of the Human Life Cycle. Collected data were analysed in accordance with Huberman and Miles’ (2000) approach. It integrated three sub-processes, namely data reduction, data display, as well as the drawing of conclusions and verification. The findings of the study indicate that Isie’s life was consistent with the pattern which Levinson (1996) identified. Isie was relatively successful in resolving the life tasks and transitional periods proposed by Levinson. The findings of the study also indicated that the development of Isie’s life structure was strongly influenced by a number of sociohistorical and global events. This research study has given a positive demonstration of the value of development theory. Furthermore, it emphasized the uniqueness of individuals in coping with the challenges of life. As a result it has opened up the possibility of perceiving people and their actions in a different way. Consequently, recommendations regarding the psychobiographical research design and methodology in future have been made.
- Full Text:
- Date Issued: 2009
- Authors: Smuts, Carisa
- Date: 2009
- Subjects: Smuts, Isie K., 1870-1954 , Psychology -- Biographical methods , Developmental psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9913 , http://hdl.handle.net/10948/894 , Smuts, Isie K., 1870-1954 , Psychology -- Biographical methods , Developmental psychology
- Description: Psychobiographical research, with the use of psychological theory, allows us to uncover and unravel the life of an individual. This important area of research for the application of a psychological theory has, however, been under-utilized, especially in South Africa. The importance of psychobiographical case study research for the development and testing of theories of human development throughout the lifespan, has been supported by a number of academics in the field. The research subject was Sibella Margaretha (Isie) Krige. Isie (1870-1954) was married to General Jan Christiaan Smuts (1870-1950). He was a prominent South African and Commonwealth statesman, military leader, botanist and philosopher. Although much has been written on General Smuts, a psychobiography on the life of Isie had not been written yet. Isie was chosen as the research subject through purposive sampling. The study employed a qualitative psychobiographical research method, which aimed to explore and describe Isie’s psychological development in terms of Daniel Levinson’s (1996) theory of the Human Life Cycle. Collected data were analysed in accordance with Huberman and Miles’ (2000) approach. It integrated three sub-processes, namely data reduction, data display, as well as the drawing of conclusions and verification. The findings of the study indicate that Isie’s life was consistent with the pattern which Levinson (1996) identified. Isie was relatively successful in resolving the life tasks and transitional periods proposed by Levinson. The findings of the study also indicated that the development of Isie’s life structure was strongly influenced by a number of sociohistorical and global events. This research study has given a positive demonstration of the value of development theory. Furthermore, it emphasized the uniqueness of individuals in coping with the challenges of life. As a result it has opened up the possibility of perceiving people and their actions in a different way. Consequently, recommendations regarding the psychobiographical research design and methodology in future have been made.
- Full Text:
- Date Issued: 2009
A public-private partnership model for the improvemnet of local economic development in South African metropolitan government
- Binza, Mzikayise Shakespeare
- 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.
- Full Text:
- Date Issued: 2009
- 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.
- Full Text:
- Date Issued: 2009
A qualitative analysis of the cost and management accounting curricula at higher education institutions in South Africa
- Authors: Roodt, Luan
- Date: 2009
- Subjects: Cost accounting -- South Africa , Managerial accounting -- South Africa , Education, Higher -- Curricula -- South Africa , Curriculum planning -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:8973 , http://hdl.handle.net/10948/1202 , Cost accounting -- South Africa , Managerial accounting -- South Africa , Education, Higher -- Curricula -- South Africa , Curriculum planning -- South Africa
- Description: The democracy in South Africa brought about many changes and new challenges. One such challenge was to transform the Higher Education institutes in South Africa. The National Commission on Higher Education (NCHE) resulted in the proposed National Plan for Higher Education in 2001. This referred to the restructuring of Higher Educational Institutes in South Africa. The National Plan for Higher Education listed priorities within section 6, which deals with the restructuring process. Some of these priorities referred to the reduction of duplications and overlaps in the programmes offered. Prior to 2005, Technikons offered the course National Diploma: Cost and Management Accounting over three years. Former Technikons developed their curricula for Cost and Management Accounting to utilise career orientated training in order to provide students with the necessary knowledge and skills for careers in financial and cost and management accounting as was applied in commerce and industry. Before the transformation and restructuring of the South African higher education institutions, Technikons in South Africa was part of a National system where a National curriculum was developed and implemented by all Technikons in South Africa. Curriculum development took place on a national level. Therefore, the programmes offered at these former Technikons were similar. Some of the former Technikons still offer the National Diploma in Cost and Management Accounting but in a different format. Students registering for this programme, register for a National Higher Certificate (NHC) in Accountancy. The duration of this NHC is two years where after students can complete a third year to graduate with a National Diploma in Cost and Management Accounting. The NHC in Accountancy was also developed on a national level and the curricula are similar at the higher education institutions offering it in South Africa. Since the merger of higher education institutions in South Africa, the responsibility to develop new programmes shifted from a national level to an institutional level. The newly merged institutions carry the responsibility to develop new programmes which suites the specific institution and serves the need of the specific communities. The iv primary objective of this study is to analyse the Cost and Management Accounting curricula in South Africa with the intention to propose a new curriculum for this diploma. To suggest a proposed curriculum, the old curricula of the various South African institutions were considered using qualitative research methods. The four South African institutions and the two Australian institutions were analysed and a balanced curriculum proposed out of this information. The proposed curriculum for the diploma in accounting, combined subjects that have been offered previously and subjects that could further expand graduate employability. Five companies were selected to evaluate the proposed curriculum. After considering the views of all the interviewed employers, a final curriculum was suggested for the Diploma in Accounting. As a result of this study it was clear that in-service training should be added to the Diploma in Accounting. Eighty percent of the interviewed potential employers suggested that practical experience in third year studies would significantly enhance student employability. Cost and Management Accounting has long been used by accountants to help managers understand the different costs of running a business. It is important for managers to identify certain areas of the business process where costs can be cut and the profitability increased. From this study it is clear that the proposed curriculum is acceptable to employers as they found that students will benefit from it.
- Full Text:
- Date Issued: 2009
- Authors: Roodt, Luan
- Date: 2009
- Subjects: Cost accounting -- South Africa , Managerial accounting -- South Africa , Education, Higher -- Curricula -- South Africa , Curriculum planning -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:8973 , http://hdl.handle.net/10948/1202 , Cost accounting -- South Africa , Managerial accounting -- South Africa , Education, Higher -- Curricula -- South Africa , Curriculum planning -- South Africa
- Description: The democracy in South Africa brought about many changes and new challenges. One such challenge was to transform the Higher Education institutes in South Africa. The National Commission on Higher Education (NCHE) resulted in the proposed National Plan for Higher Education in 2001. This referred to the restructuring of Higher Educational Institutes in South Africa. The National Plan for Higher Education listed priorities within section 6, which deals with the restructuring process. Some of these priorities referred to the reduction of duplications and overlaps in the programmes offered. Prior to 2005, Technikons offered the course National Diploma: Cost and Management Accounting over three years. Former Technikons developed their curricula for Cost and Management Accounting to utilise career orientated training in order to provide students with the necessary knowledge and skills for careers in financial and cost and management accounting as was applied in commerce and industry. Before the transformation and restructuring of the South African higher education institutions, Technikons in South Africa was part of a National system where a National curriculum was developed and implemented by all Technikons in South Africa. Curriculum development took place on a national level. Therefore, the programmes offered at these former Technikons were similar. Some of the former Technikons still offer the National Diploma in Cost and Management Accounting but in a different format. Students registering for this programme, register for a National Higher Certificate (NHC) in Accountancy. The duration of this NHC is two years where after students can complete a third year to graduate with a National Diploma in Cost and Management Accounting. The NHC in Accountancy was also developed on a national level and the curricula are similar at the higher education institutions offering it in South Africa. Since the merger of higher education institutions in South Africa, the responsibility to develop new programmes shifted from a national level to an institutional level. The newly merged institutions carry the responsibility to develop new programmes which suites the specific institution and serves the need of the specific communities. The iv primary objective of this study is to analyse the Cost and Management Accounting curricula in South Africa with the intention to propose a new curriculum for this diploma. To suggest a proposed curriculum, the old curricula of the various South African institutions were considered using qualitative research methods. The four South African institutions and the two Australian institutions were analysed and a balanced curriculum proposed out of this information. The proposed curriculum for the diploma in accounting, combined subjects that have been offered previously and subjects that could further expand graduate employability. Five companies were selected to evaluate the proposed curriculum. After considering the views of all the interviewed employers, a final curriculum was suggested for the Diploma in Accounting. As a result of this study it was clear that in-service training should be added to the Diploma in Accounting. Eighty percent of the interviewed potential employers suggested that practical experience in third year studies would significantly enhance student employability. Cost and Management Accounting has long been used by accountants to help managers understand the different costs of running a business. It is important for managers to identify certain areas of the business process where costs can be cut and the profitability increased. From this study it is clear that the proposed curriculum is acceptable to employers as they found that students will benefit from it.
- Full Text:
- Date Issued: 2009
A re-evaluation of morphological differences in the Karoo Thrush Turdus smithi–Olive Thrush Turdus olivaceus species complex
- Wilson, J W, Symes, C T, Brown, M, Bonnevie, Bo T, De Swardt, D H, Hanmer, D
- Authors: Wilson, J W , Symes, C T , Brown, M , Bonnevie, Bo T , De Swardt, D H , Hanmer, D
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447680 , vital:74666 , https://doi.org/10.2989/OSTRICH.2009.80.3.7.970
- Description: There is confusion in the literature concerning the taxonomic status of the Turdus smithi—T. olivaceus species complex. Here we attempt to clarify morphological differences within this complex. In addition, we attempt to clarify identification of the respective taxa. Although mean measurements of morphometric features differed significantly between species and subspecies, these features are not useful in separating species or subspecies due to considerable overlap in measurements. Furthermore, there were often larger differences between subspecies of T. olivaceus (particularly the geographically isolated T. o. swynnertoni) than between T. olivaceus and T. smithi. We therefore suggest that further work investigates the elevation of T. o. swynnertoni to full species status. Plumage characteristics proved more useful in separating T. olivaceus and T. smithi in the field, except in regions where the distributions overlap (potential hybridisation zones). We highlight the importance of clarifying the delineation of separate species particularly with respect to bird census data (e.g. Southern African Bird Atlas Project 2) and studies related to these species.
- Full Text:
- Date Issued: 2009
- Authors: Wilson, J W , Symes, C T , Brown, M , Bonnevie, Bo T , De Swardt, D H , Hanmer, D
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447680 , vital:74666 , https://doi.org/10.2989/OSTRICH.2009.80.3.7.970
- Description: There is confusion in the literature concerning the taxonomic status of the Turdus smithi—T. olivaceus species complex. Here we attempt to clarify morphological differences within this complex. In addition, we attempt to clarify identification of the respective taxa. Although mean measurements of morphometric features differed significantly between species and subspecies, these features are not useful in separating species or subspecies due to considerable overlap in measurements. Furthermore, there were often larger differences between subspecies of T. olivaceus (particularly the geographically isolated T. o. swynnertoni) than between T. olivaceus and T. smithi. We therefore suggest that further work investigates the elevation of T. o. swynnertoni to full species status. Plumage characteristics proved more useful in separating T. olivaceus and T. smithi in the field, except in regions where the distributions overlap (potential hybridisation zones). We highlight the importance of clarifying the delineation of separate species particularly with respect to bird census data (e.g. Southern African Bird Atlas Project 2) and studies related to these species.
- Full Text:
- Date Issued: 2009
A real time HF beacon monitoring station for South Africa
- Authors: Mudzingwa, Courage
- Date: 2009
- Subjects: Radio , Shortwave radio , Radio and television towers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5486 , http://hdl.handle.net/10962/d1005272 , Radio , Shortwave radio , Radio and television towers
- Description: High frequency, HF (3 - 30 MHz), radio communications are greatly affected by ionospheric conditions. Both civilian and military users need reliable, real time propagation information to show at any time the feasibility of communicating to any part of the world on a particular frequency band. For this thesis, an automated receiving/monitoring station for the Northern California DX Foundation (NCDXF)/ International Amateur Radio Union (IARU) International Beacon Project was setup at the Hermanus Magnetic Observatory, HMO (34.42oS, 19.22oE) to monitor international beacons on 20 m, 17 m, 15 m, 12 m and 10 m bands. The beacons form a world wide multiband network. The task of monitoring the beacons was broken down into two steps. Initially the single band station, at 14.10 MHz, was installed and later it was upgraded to a multiband station capable of automatically monitoring all the five HF bands. The single band station setup involved the construction and installation of the half-wave dipole antenna, construction and installation of an HF choke balun; and the choice of Faros 1.3 as the appropriate monitoring software. The multiband monitoring station set-up involved the installation of an MFJ-1778 G5RV multiband antenna, construction and installation of a Communication Interface - V (CI-V) level converter and configuring the Faros 1.3 software to monitor the beacons on all five HF bands. Then a web page was created on the HMO space weather website (http://spaceweather.hmo.ac.za). Here, the real-time signal to noise ratio (SNR) and short path (SP)/long path (LP) plots are uploaded every 3 minutes, showing real time HF propagation conditions on the five HF bands. Historical propagation data are archived for later analysis. A preliminary data analysis was done to confirm the peration of the monitoring station. The archived data were analysed and compared to ICEPAC (Ionospheric Communications Enhanced Profile Analysis and Circuit) predictions. Results show that the real-time signal plots as well as the archive of historical signal plots, convey information on ropagation conditions to users in terms that are easy to interpret and understand.
- Full Text:
- Date Issued: 2009
- Authors: Mudzingwa, Courage
- Date: 2009
- Subjects: Radio , Shortwave radio , Radio and television towers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5486 , http://hdl.handle.net/10962/d1005272 , Radio , Shortwave radio , Radio and television towers
- Description: High frequency, HF (3 - 30 MHz), radio communications are greatly affected by ionospheric conditions. Both civilian and military users need reliable, real time propagation information to show at any time the feasibility of communicating to any part of the world on a particular frequency band. For this thesis, an automated receiving/monitoring station for the Northern California DX Foundation (NCDXF)/ International Amateur Radio Union (IARU) International Beacon Project was setup at the Hermanus Magnetic Observatory, HMO (34.42oS, 19.22oE) to monitor international beacons on 20 m, 17 m, 15 m, 12 m and 10 m bands. The beacons form a world wide multiband network. The task of monitoring the beacons was broken down into two steps. Initially the single band station, at 14.10 MHz, was installed and later it was upgraded to a multiband station capable of automatically monitoring all the five HF bands. The single band station setup involved the construction and installation of the half-wave dipole antenna, construction and installation of an HF choke balun; and the choice of Faros 1.3 as the appropriate monitoring software. The multiband monitoring station set-up involved the installation of an MFJ-1778 G5RV multiband antenna, construction and installation of a Communication Interface - V (CI-V) level converter and configuring the Faros 1.3 software to monitor the beacons on all five HF bands. Then a web page was created on the HMO space weather website (http://spaceweather.hmo.ac.za). Here, the real-time signal to noise ratio (SNR) and short path (SP)/long path (LP) plots are uploaded every 3 minutes, showing real time HF propagation conditions on the five HF bands. Historical propagation data are archived for later analysis. A preliminary data analysis was done to confirm the peration of the monitoring station. The archived data were analysed and compared to ICEPAC (Ionospheric Communications Enhanced Profile Analysis and Circuit) predictions. Results show that the real-time signal plots as well as the archive of historical signal plots, convey information on ropagation conditions to users in terms that are easy to interpret and understand.
- Full Text:
- Date Issued: 2009
A recurrent neural network approach to quantitatively studying solar wind effects on TEC derived from GPS; preliminary results
- Habarulema, John B, McKinnell, Lee-Anne, Opperman, Ben D L
- Authors: Habarulema, John B , McKinnell, Lee-Anne , Opperman, Ben D L
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6813 , http://hdl.handle.net/10962/d1004323
- Description: This paper attempts to describe the search for the parameter(s) to represent solar wind effects in Global Positioning System total electron content (GPS TEC) modelling using the technique of neural networks (NNs). A study is carried out by including solar wind velocity (Vsw), proton number density (Np) and the Bz component of the interplanetary magnetic field (IMF Bz) obtained from the Advanced Composition Explorer (ACE) satellite as separate inputs to the NN each along with day number of the year (DN), hour (HR), a 4-month running mean of the daily sunspot number (R4) and the running mean of the previous eight 3-hourly magnetic A index values (A8). Hourly GPS TEC values derived from a dual frequency receiver located at Sutherland (32.38° S, 20.81° E), South Africa for 8 years (2000–2007) have been used to train the Elman neural network (ENN) and the result has been used to predict TEC variations for a GPS station located at Cape Town (33.95° S, 18.47° E). Quantitative results indicate that each of the parameters considered may have some degree of influence on GPS TEC at certain periods although a decrease in prediction accuracy is also observed for some parameters for different days and seasons. It is also evident that there is still a difficulty in predicting TEC values during disturbed conditions. The improvements and degradation in prediction accuracies are both close to the benchmark values which lends weight to the belief that diurnal, seasonal, solar and magnetic variabilities may be the major determinants of TEC variability.
- Full Text:
- Date Issued: 2009
- Authors: Habarulema, John B , McKinnell, Lee-Anne , Opperman, Ben D L
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6813 , http://hdl.handle.net/10962/d1004323
- Description: This paper attempts to describe the search for the parameter(s) to represent solar wind effects in Global Positioning System total electron content (GPS TEC) modelling using the technique of neural networks (NNs). A study is carried out by including solar wind velocity (Vsw), proton number density (Np) and the Bz component of the interplanetary magnetic field (IMF Bz) obtained from the Advanced Composition Explorer (ACE) satellite as separate inputs to the NN each along with day number of the year (DN), hour (HR), a 4-month running mean of the daily sunspot number (R4) and the running mean of the previous eight 3-hourly magnetic A index values (A8). Hourly GPS TEC values derived from a dual frequency receiver located at Sutherland (32.38° S, 20.81° E), South Africa for 8 years (2000–2007) have been used to train the Elman neural network (ENN) and the result has been used to predict TEC variations for a GPS station located at Cape Town (33.95° S, 18.47° E). Quantitative results indicate that each of the parameters considered may have some degree of influence on GPS TEC at certain periods although a decrease in prediction accuracy is also observed for some parameters for different days and seasons. It is also evident that there is still a difficulty in predicting TEC values during disturbed conditions. The improvements and degradation in prediction accuracies are both close to the benchmark values which lends weight to the belief that diurnal, seasonal, solar and magnetic variabilities may be the major determinants of TEC variability.
- Full Text:
- Date Issued: 2009