A framework for teaching secure coding practices through a blended learning approach
- Mdunyelwa, Vuyolwethu Sizoli
- Authors: Mdunyelwa, Vuyolwethu Sizoli
- Date: 2020
- Subjects: Blended learning , Blended learning -- Case studies Computer security
- Language: English
- Type: Thesis , Masters , MIT
- Identifier: http://hdl.handle.net/10948/49940 , vital:41890
- Description: With the recent increase in cyber-related attacks, cybersecurity is becoming a key area of concern for many organisations. Cybersecurity vulnerabilities are typically addressed through the implementation of various cybersecurity controls. These controls can be operational, technical or physical in nature. The focus of this research, however, is on technical controls with a specific focus on securing web applications. This research investigated whether third year software development students at the Nelson Mandela University adhered to secure coding practices in their capstone projects. In order to determine adherence, secure coding practices were identified from OWASP for the data access layer in web applications developed in the .NET environment. This was addressed by Secondary Objective, which was To determine what secure coding practices a web application developer should adhere to in the .NET environment. These secure coding practices were used to conduct a code review on 2015 third year capstone projects, and addressed Secondary Objective, To determine the adherence of third year software development capstone projects to the identified secure coding practices. The results for the code review were analysed and indicated low levels of adherence which led to the Problem Statement of this research, namely: Undergraduate software development students do not consistently adhere to secure coding practices when developing their third-year capstone projects, thereby leading to vulnerabilities in their web applications. In order to address this Problem Statement, the Primary Objective was identified, To develop a framework for teaching secure coding practices through a blended learning approach. Secondary Objective, To determine whether third year software development students have the requisite knowledge relating to secure coding, took the form of a questionnaire to assess students' knowledge relating to secure coding practices. This required the achievement of further sub-objectives which addressed both the knowledge and behaviour of software development students. The results of this questionnaire indicated that many of the third-year software development students lacked the requisite knowledge. This lack of knowledge and adherence was addressed through an educational intervention, meeting Secondary Objective, To design and implement an educational intervention to support software development students in the development of secure web applications. In terms of knowledge, online lessons were developed addressing each of the secure coding practices identified. In order to address adherence, students were given a checklist to monitor their adherence to the identified secure coding practices. Secondary Objective, To determine the exact of the educational intervention on both student adherence and their requisite knowledge regarding secure coding practices, involved the varication of the educational intervention, and comprised of two components, knowledge and behaviour. Knowledge varication took the form of an online questionnaire given to 2017 third year project students. To address behavioural adherence, the researcher conducted a code review on the 2017 capstone projects. The results from the varication showed a general improvement in students' knowledge and high levels of adherence to secure coding practices. Finally, a framework was developed that encompassed the key elements of this research, thereby providing guidance to support the development of se cure web applications in higher education institutions and meeting the primary objective of this study.
- Full Text:
- Date Issued: 2020
- Authors: Mdunyelwa, Vuyolwethu Sizoli
- Date: 2020
- Subjects: Blended learning , Blended learning -- Case studies Computer security
- Language: English
- Type: Thesis , Masters , MIT
- Identifier: http://hdl.handle.net/10948/49940 , vital:41890
- Description: With the recent increase in cyber-related attacks, cybersecurity is becoming a key area of concern for many organisations. Cybersecurity vulnerabilities are typically addressed through the implementation of various cybersecurity controls. These controls can be operational, technical or physical in nature. The focus of this research, however, is on technical controls with a specific focus on securing web applications. This research investigated whether third year software development students at the Nelson Mandela University adhered to secure coding practices in their capstone projects. In order to determine adherence, secure coding practices were identified from OWASP for the data access layer in web applications developed in the .NET environment. This was addressed by Secondary Objective, which was To determine what secure coding practices a web application developer should adhere to in the .NET environment. These secure coding practices were used to conduct a code review on 2015 third year capstone projects, and addressed Secondary Objective, To determine the adherence of third year software development capstone projects to the identified secure coding practices. The results for the code review were analysed and indicated low levels of adherence which led to the Problem Statement of this research, namely: Undergraduate software development students do not consistently adhere to secure coding practices when developing their third-year capstone projects, thereby leading to vulnerabilities in their web applications. In order to address this Problem Statement, the Primary Objective was identified, To develop a framework for teaching secure coding practices through a blended learning approach. Secondary Objective, To determine whether third year software development students have the requisite knowledge relating to secure coding, took the form of a questionnaire to assess students' knowledge relating to secure coding practices. This required the achievement of further sub-objectives which addressed both the knowledge and behaviour of software development students. The results of this questionnaire indicated that many of the third-year software development students lacked the requisite knowledge. This lack of knowledge and adherence was addressed through an educational intervention, meeting Secondary Objective, To design and implement an educational intervention to support software development students in the development of secure web applications. In terms of knowledge, online lessons were developed addressing each of the secure coding practices identified. In order to address adherence, students were given a checklist to monitor their adherence to the identified secure coding practices. Secondary Objective, To determine the exact of the educational intervention on both student adherence and their requisite knowledge regarding secure coding practices, involved the varication of the educational intervention, and comprised of two components, knowledge and behaviour. Knowledge varication took the form of an online questionnaire given to 2017 third year project students. To address behavioural adherence, the researcher conducted a code review on the 2017 capstone projects. The results from the varication showed a general improvement in students' knowledge and high levels of adherence to secure coding practices. Finally, a framework was developed that encompassed the key elements of this research, thereby providing guidance to support the development of se cure web applications in higher education institutions and meeting the primary objective of this study.
- Full Text:
- Date Issued: 2020
A framework for the implementation of e-government as a service delivery mechanism in South Africa: The case of the Eastern Cape Thusong Service Centres
- Authors: Madyibi, Ayanda
- Date: 2020
- Subjects: Electronic government information Technological innovations Information technology
- Language: English
- Type: Thesis , Doctoral , PhD(Information Systems)
- Identifier: http://hdl.handle.net/10353/18908 , vital:42997
- Description: E-government has emerged as an effective means of delivering much-needed online services to the citizens, businesses and other government institutions. This emanates from the advancement of Information and Communication Technology (ICT), the internet and the emerging technologies associated with the Fourth Industrial Revolution (4IR). E-government has essentially transformed the culture, structure and the way of doing business by public institutions in providing government services. In the past, e-government has been popular in developed countries but recently many developing countries are starting to appreciate the need to implement the initiative. However, the implementation of e-government has various challenges that have been identified through research and include technological, organisational and environmental aspects. Therefore, the researcher was motivated to study e-government to improve the delivery of services to citizens in South Africa. The objective of the research was to develop a framework for the implementation of egovernment as a service delivery mechanism in South Africa. The research process led to the identification of challenges that impact the implementation of e-government by applying an underlying Information Systems (IS) theoretical model, namely the Technology-OrganisationEnvironment (TOE) framework. The review of literature allowed the researcher to construct a conceptual theoretical framework which was then applied to the case study in order to understand the factors affecting the implementation of e-government in South Africa. Qualitative research data was collected using Thusong Service Centres in the Eastern Cape as a case study. Thusong Service Centres are government service centres based in rural communities which are used for the provision of online government services to these communities. The empirical data was collected using 22 respondents from five organisational and user perspectives: (1) State Information Technology Agency (SITA) as an agency of government responsible for ICT in South Africa, (2) the Senior ICT Managers from various National, Provincial and Local government entities, (3) Thusong Service Centre Managers, (4) Thusong Service Centre End-Users and (5) Expert Reviews. Documents that included the National e-Government Strategy, e-Government Policy, National Broadband Policy, ICT Policy White Paper were also consulted as secondary data. The conceptual theoretical framework was then revised based on the empirical evidence using the interpretive exploratory approach and triangulated data. The consolidated data from both the literature review and empirical evidence assisted in closing the gap between e-government implementation theory and practice. A detailed e-government implementation framework was then developed with the critical factors that impact the successful implementation of e- ii | P a g e government. E-government subject experts were also given the mandate to review the interview questions and the framework. The use of this framework was then explained in terms of how it can assist government decision-makers in South Africa for the effective and efficient delivery of services to the citizens. The research study has contributed to the e-government body of knowledge through the identified factors utilising the TOE framework at an organisational level for developing countries like South Africa.
- Full Text:
- Date Issued: 2020
- Authors: Madyibi, Ayanda
- Date: 2020
- Subjects: Electronic government information Technological innovations Information technology
- Language: English
- Type: Thesis , Doctoral , PhD(Information Systems)
- Identifier: http://hdl.handle.net/10353/18908 , vital:42997
- Description: E-government has emerged as an effective means of delivering much-needed online services to the citizens, businesses and other government institutions. This emanates from the advancement of Information and Communication Technology (ICT), the internet and the emerging technologies associated with the Fourth Industrial Revolution (4IR). E-government has essentially transformed the culture, structure and the way of doing business by public institutions in providing government services. In the past, e-government has been popular in developed countries but recently many developing countries are starting to appreciate the need to implement the initiative. However, the implementation of e-government has various challenges that have been identified through research and include technological, organisational and environmental aspects. Therefore, the researcher was motivated to study e-government to improve the delivery of services to citizens in South Africa. The objective of the research was to develop a framework for the implementation of egovernment as a service delivery mechanism in South Africa. The research process led to the identification of challenges that impact the implementation of e-government by applying an underlying Information Systems (IS) theoretical model, namely the Technology-OrganisationEnvironment (TOE) framework. The review of literature allowed the researcher to construct a conceptual theoretical framework which was then applied to the case study in order to understand the factors affecting the implementation of e-government in South Africa. Qualitative research data was collected using Thusong Service Centres in the Eastern Cape as a case study. Thusong Service Centres are government service centres based in rural communities which are used for the provision of online government services to these communities. The empirical data was collected using 22 respondents from five organisational and user perspectives: (1) State Information Technology Agency (SITA) as an agency of government responsible for ICT in South Africa, (2) the Senior ICT Managers from various National, Provincial and Local government entities, (3) Thusong Service Centre Managers, (4) Thusong Service Centre End-Users and (5) Expert Reviews. Documents that included the National e-Government Strategy, e-Government Policy, National Broadband Policy, ICT Policy White Paper were also consulted as secondary data. The conceptual theoretical framework was then revised based on the empirical evidence using the interpretive exploratory approach and triangulated data. The consolidated data from both the literature review and empirical evidence assisted in closing the gap between e-government implementation theory and practice. A detailed e-government implementation framework was then developed with the critical factors that impact the successful implementation of e- ii | P a g e government. E-government subject experts were also given the mandate to review the interview questions and the framework. The use of this framework was then explained in terms of how it can assist government decision-makers in South Africa for the effective and efficient delivery of services to the citizens. The research study has contributed to the e-government body of knowledge through the identified factors utilising the TOE framework at an organisational level for developing countries like South Africa.
- Full Text:
- Date Issued: 2020
A framework to enhance Information and Communication Technology (ICT) readiness for business continuity at the South African Revenue Services (SARS)
- Authors: Mathase, Euphodia
- Date: 2020
- Subjects: Internet in public administration -- Taxation -- South Africa Electronic commerce -- Government policy -- South Africa
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/49496 , vital:41726
- Description: Many organisations, especially public sector organisations, are required to ensure that they are able to continue with their operation in cases of major disasters that affect the organisations. In the same light, the South African Revenue Services (SARS), being a quasi-government organisation, faces a similar phenomenon. The main purpose of conducting this research was to explore a problem in depth that was identified at the SARS. SARS does not have a comprehensive business continuity plan. The study therefore examined possible techniques or actions for ensuring information and communication technology (ICT) readiness and business continuity, explored various frameworks and policy documents which will assist public entities with readiness for business continuity, and identified frameworks that will assist SARS in implementing an effective ICT readiness for business continuity. The study adopted the design science research approach and aspects of design science research in information systems. Data gathered through the questionnaire instrument was used to design a framework that can be adopted at SARS to enhance ICT readiness for business continuity. The research findings show the importance of effective business continuity management (BCM) and a framework that can be used to implement an effective BCM.
- Full Text:
- Date Issued: 2020
- Authors: Mathase, Euphodia
- Date: 2020
- Subjects: Internet in public administration -- Taxation -- South Africa Electronic commerce -- Government policy -- South Africa
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/49496 , vital:41726
- Description: Many organisations, especially public sector organisations, are required to ensure that they are able to continue with their operation in cases of major disasters that affect the organisations. In the same light, the South African Revenue Services (SARS), being a quasi-government organisation, faces a similar phenomenon. The main purpose of conducting this research was to explore a problem in depth that was identified at the SARS. SARS does not have a comprehensive business continuity plan. The study therefore examined possible techniques or actions for ensuring information and communication technology (ICT) readiness and business continuity, explored various frameworks and policy documents which will assist public entities with readiness for business continuity, and identified frameworks that will assist SARS in implementing an effective ICT readiness for business continuity. The study adopted the design science research approach and aspects of design science research in information systems. Data gathered through the questionnaire instrument was used to design a framework that can be adopted at SARS to enhance ICT readiness for business continuity. The research findings show the importance of effective business continuity management (BCM) and a framework that can be used to implement an effective BCM.
- Full Text:
- Date Issued: 2020
A framework to integrate secure programming principles into undergraduate computing curricula
- Authors: Bangani, Sifiso Matthews
- Date: 2020
- Subjects: Information technology -- Study and teaching (Higher) , Electronic data processing personnel -- Training of Computer software -- Development
- Language: English
- Type: Thesis , Masters , MIT
- Identifier: http://hdl.handle.net/10948/46019 , vital:39409
- Description: Many graduate software developers are not competent in secure programming, resulting in risks that are caused by vulnerabilities in the application code of software applications. These graduate software developers are equipped with programming knowledge and skills from universities, however, these software developers are rarely equipped with secure programming knowledge and skills from the undergraduate level. Although there are various techniques for writing secure code in the current body of knowledge, these techniques are rarely fundamental components of a computing curriculum, resulting in incompetent graduate software developers. The security aspect of software applications, is considered as an important aspect that can reflect the ability of a system to prevent data exposures and loss of information. For businesses that rely on software applications to keep operations running, a failure of a software application can stop production, interrupt processes, and may lead to data breaches and financial losses. This research argued that secure programming education needs to be included across computing curricula, and thus, the primary objective of this dissertation was: To develop a framework for integrating secure programming principles into undergraduate computing curricula. It proposes a framework for the incorporation of secure programming principles into undergraduate computing curricula, through a step-by-step approach. This framework includes the identification of application risks and secure programming practices as they relate to each other, and to the basic programming concepts taught to undergraduate students. It specifically aims to improve the security of software applications developed in the .Net framework environment. The main research methods used in this study included a literature view, thematic content analysis, argumentation, and modelling.
- Full Text:
- Date Issued: 2020
- Authors: Bangani, Sifiso Matthews
- Date: 2020
- Subjects: Information technology -- Study and teaching (Higher) , Electronic data processing personnel -- Training of Computer software -- Development
- Language: English
- Type: Thesis , Masters , MIT
- Identifier: http://hdl.handle.net/10948/46019 , vital:39409
- Description: Many graduate software developers are not competent in secure programming, resulting in risks that are caused by vulnerabilities in the application code of software applications. These graduate software developers are equipped with programming knowledge and skills from universities, however, these software developers are rarely equipped with secure programming knowledge and skills from the undergraduate level. Although there are various techniques for writing secure code in the current body of knowledge, these techniques are rarely fundamental components of a computing curriculum, resulting in incompetent graduate software developers. The security aspect of software applications, is considered as an important aspect that can reflect the ability of a system to prevent data exposures and loss of information. For businesses that rely on software applications to keep operations running, a failure of a software application can stop production, interrupt processes, and may lead to data breaches and financial losses. This research argued that secure programming education needs to be included across computing curricula, and thus, the primary objective of this dissertation was: To develop a framework for integrating secure programming principles into undergraduate computing curricula. It proposes a framework for the incorporation of secure programming principles into undergraduate computing curricula, through a step-by-step approach. This framework includes the identification of application risks and secure programming practices as they relate to each other, and to the basic programming concepts taught to undergraduate students. It specifically aims to improve the security of software applications developed in the .Net framework environment. The main research methods used in this study included a literature view, thematic content analysis, argumentation, and modelling.
- Full Text:
- Date Issued: 2020
A framework to measure the degree of alignment between corporate and IT/IS objectives at Randwater
- Authors: Sigasa, Moshane Lydia
- Date: 2020
- Subjects: Business enterprises -- Computer networks -- Security measures , Data protection Information technology -- Security measures
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/47156 , vital:39818
- Description: The South African Government has institutionalised a Corporate Governance of ICT Policy Framework which was developed by Department of Public Service and Administration (DPSA). The framework has adopted some elements of KING III, ISO 38500 and COBIT. Consequently, it is now a requirement by the South African Government that all its entities must adopt this framework. Nevertheless, it is not clear how government has emphasised this alignment in such entities. The problem statement in this study was that Randwater is unable to realise full value of the investment in IT/IS because there is misalignment between IT objectives or deliverables and the corporate objectives. This study sought to identify a suitable framework which meets the ICT policy criteria as set out by the DPSA, which will facilitate the alignment between corporate objectives and IT/IS objectives at Randwater. This was achieved through the development and refinement of the artefact through the various iteration phases. Additionally, an online survey was used to collect data from a focus group comprising IT experts and senior management at Randwater. The Information Technology Governance Institute Framework was employed to assist in the development of the questions. The survey results were utilised during the validation of the artefact produced by this research study in a workshop. The findings were then linked with the related literature which either supported or rejected the findings through discussions on the literature and thereafter conclusions were made based on these findings. Furthermore, a literature review was conducted to gain a better understanding of what has been done in the field of research in order to assist in defining the problem that this research seeks to solve so as to inform the development of design characteristics. The research process employed the Nelson Mandela University – Design Science Strategy Methodology referred to as (NMU – DSSM) with the goal of developing an artefact in the form of a framework. The research process entailed studying the existing literature and analysing the aspects relating to corporate governance, IT governance, frameworks, and strategies to be able to measure the degree of alignment. The phases of designing the artefact were analysis, design, evaluate, validate and diffuse phases. The final artefact developed was a framework that incorporated the principles of King IV and ISO 38500 in corporate governance and ICT goals alignment. The final artefact also embedded transparency, accountability and security as important elements in the implementation of the artefact. The survey findings were instrumental in the development of the artefact that brings alignment between business strategy and IT objectives at Randwater. From the findings, in terms of IT flexibility, it was revealed that the interrelated parts of the system at Randwater were modular. It was also concluded that there is lack of communication about the manner in which the components of the information systems are organised and integrated in order to allow for rapid changes and that the organisational IT infrastructure and applications were loosely coupled. The findings further revealed that the business had established corporate rules and standards for hardware and operating systems to ensure platform compatibility. It was also revealed that organisational IT applications were developed based on compliance guidelines. In terms of IT-enabled dynamic capabilities, it was revealed that IT systems at Randwater are not capable of scanning the environment and identifying new business opportunities and are not capable of anticipating discontinuities arising in the business domain by developing greater reactive and proactive strength. It was also revealed that it was concluded that IT systems were capable of achieving strategic alignment between IT flexibility and dynamic capabilities. Therefore, design science was the ideal research paradigm towards addressing the research problem and the artefact designed was a viable research contribution. The significance of the study was that it contributed to the development of technology-based solutions to an important and relevant business problem of alignment of business strategy to IT goals. The design evaluation, the utility, quality, and efficacy of the final design artefact was rigorously demonstrated via well-executed evaluation methods. The study also contributed to the literature
- Full Text:
- Date Issued: 2020
- Authors: Sigasa, Moshane Lydia
- Date: 2020
- Subjects: Business enterprises -- Computer networks -- Security measures , Data protection Information technology -- Security measures
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/47156 , vital:39818
- Description: The South African Government has institutionalised a Corporate Governance of ICT Policy Framework which was developed by Department of Public Service and Administration (DPSA). The framework has adopted some elements of KING III, ISO 38500 and COBIT. Consequently, it is now a requirement by the South African Government that all its entities must adopt this framework. Nevertheless, it is not clear how government has emphasised this alignment in such entities. The problem statement in this study was that Randwater is unable to realise full value of the investment in IT/IS because there is misalignment between IT objectives or deliverables and the corporate objectives. This study sought to identify a suitable framework which meets the ICT policy criteria as set out by the DPSA, which will facilitate the alignment between corporate objectives and IT/IS objectives at Randwater. This was achieved through the development and refinement of the artefact through the various iteration phases. Additionally, an online survey was used to collect data from a focus group comprising IT experts and senior management at Randwater. The Information Technology Governance Institute Framework was employed to assist in the development of the questions. The survey results were utilised during the validation of the artefact produced by this research study in a workshop. The findings were then linked with the related literature which either supported or rejected the findings through discussions on the literature and thereafter conclusions were made based on these findings. Furthermore, a literature review was conducted to gain a better understanding of what has been done in the field of research in order to assist in defining the problem that this research seeks to solve so as to inform the development of design characteristics. The research process employed the Nelson Mandela University – Design Science Strategy Methodology referred to as (NMU – DSSM) with the goal of developing an artefact in the form of a framework. The research process entailed studying the existing literature and analysing the aspects relating to corporate governance, IT governance, frameworks, and strategies to be able to measure the degree of alignment. The phases of designing the artefact were analysis, design, evaluate, validate and diffuse phases. The final artefact developed was a framework that incorporated the principles of King IV and ISO 38500 in corporate governance and ICT goals alignment. The final artefact also embedded transparency, accountability and security as important elements in the implementation of the artefact. The survey findings were instrumental in the development of the artefact that brings alignment between business strategy and IT objectives at Randwater. From the findings, in terms of IT flexibility, it was revealed that the interrelated parts of the system at Randwater were modular. It was also concluded that there is lack of communication about the manner in which the components of the information systems are organised and integrated in order to allow for rapid changes and that the organisational IT infrastructure and applications were loosely coupled. The findings further revealed that the business had established corporate rules and standards for hardware and operating systems to ensure platform compatibility. It was also revealed that organisational IT applications were developed based on compliance guidelines. In terms of IT-enabled dynamic capabilities, it was revealed that IT systems at Randwater are not capable of scanning the environment and identifying new business opportunities and are not capable of anticipating discontinuities arising in the business domain by developing greater reactive and proactive strength. It was also revealed that it was concluded that IT systems were capable of achieving strategic alignment between IT flexibility and dynamic capabilities. Therefore, design science was the ideal research paradigm towards addressing the research problem and the artefact designed was a viable research contribution. The significance of the study was that it contributed to the development of technology-based solutions to an important and relevant business problem of alignment of business strategy to IT goals. The design evaluation, the utility, quality, and efficacy of the final design artefact was rigorously demonstrated via well-executed evaluation methods. The study also contributed to the literature
- Full Text:
- Date Issued: 2020
A framework to measure the degree of alignment between corporate and IT/IS objectives at Randwater
- Authors: Sigasa, Moshane Lydia
- Date: 2020
- Subjects: Information technology -- Management , Business enterprises -- Computer networks
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/48841 , vital:41145
- Description: The South African Government has institutionalised a Corporate Governance of ICT Policy Framework which was developed by Department of Public Service and Administration (DPSA). The framework has adopted some elements of KING III, ISO 38500 and COBIT. Consequently, it is now a requirement by the South African Government that all its entities must adopt this framework. Nevertheless, it is not clear how government has emphasised this alignment in such entities. The problem statement in this study was that Randwater is unable to realise full value of the investment in IT/IS because there is misalignment between IT objectives or deliverables and the corporate objectives. This study sought to identify a suitable framework which meets the ICT policy criteria as set out by the DPSA, which will facilitate the alignment between corporate objectives and IT/IS objectives at Randwater. This was achieved through the development and refinement of the artefact through the various iteration phases. Additionally, an online survey was used to collect data from a focus group comprising IT experts and senior management at Randwater. The Information Technology Governance Institute Framework was employed to assist in the development of the questions. The survey results were utilised during the validation of the artefact produced by this research study in a workshop. The findings were then linked with the related literature which either supported or rejected the findings through discussions on the literature and thereafter conclusions were made based on these findings. Furthermore, a literature review was conducted to gain a better understanding of what has been done in the field of research in order to assist in defining the problem that this research seeks to solve so as to inform the development of design characteristics. The research process employed the Nelson Mandela University – Design Science Strategy Methodology referred to as (NMU – DSSM) with the goal of developing an artefact in the form of a framework. The research process entailed studying the existing literature and analysing the aspects relating to corporate governance, IT governance, frameworks, and strategies to be able to measure the degree of alignment. The phases of designing the artefact were analysis, design, evaluate, validate and diffuse phases. The final artefact developed was a framework that incorporated the principles of King IV and ISO 38500 in corporate governance and ICT goals alignment. The final artefact also embedded transparency, accountability and security as important elements in the implementation of the artefact. v The survey findings were instrumental in the development of the artefact that brings alignment between business strategy and IT objectives at Randwater. From the findings, in terms of IT flexibility, it was revealed that the interrelated parts of the system at Randwater were modular. It was also concluded that there is lack of communication about the manner in which the components of the information systems are organised and integrated in order to allow for rapid changes and that the organisational IT infrastructure and applications were loosely coupled. The findings further revealed that the business had established corporate rules and standards for hardware and operating systems to ensure platform compatibility. It was also revealed that organisational IT applications were developed based on compliance guidelines. In terms of IT-enabled dynamic capabilities, it was revealed that IT systems at Randwater are not capable of scanning the environment and identifying new business opportunities and are not capable of anticipating discontinuities arising in the business domain by developing greater reactive and proactive strength. It was also revealed that it was concluded that IT systems were capable of achieving strategic alignment between IT flexibility and dynamic capabilities. Therefore, design science was the ideal research paradigm towards addressing the research problem and the artefact designed was a viable research contribution. The significance of the study was that it contributed to the development of technology-based solutions to an important and relevant business problem of alignment of business strategy to IT goals. The design evaluation, the utility, quality, and efficacy of the final design artefact was rigorously demonstrated via well-executed evaluation methods. The study also contributed to the literature available on business strategic alignment with ICT goals.
- Full Text:
- Date Issued: 2020
- Authors: Sigasa, Moshane Lydia
- Date: 2020
- Subjects: Information technology -- Management , Business enterprises -- Computer networks
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/48841 , vital:41145
- Description: The South African Government has institutionalised a Corporate Governance of ICT Policy Framework which was developed by Department of Public Service and Administration (DPSA). The framework has adopted some elements of KING III, ISO 38500 and COBIT. Consequently, it is now a requirement by the South African Government that all its entities must adopt this framework. Nevertheless, it is not clear how government has emphasised this alignment in such entities. The problem statement in this study was that Randwater is unable to realise full value of the investment in IT/IS because there is misalignment between IT objectives or deliverables and the corporate objectives. This study sought to identify a suitable framework which meets the ICT policy criteria as set out by the DPSA, which will facilitate the alignment between corporate objectives and IT/IS objectives at Randwater. This was achieved through the development and refinement of the artefact through the various iteration phases. Additionally, an online survey was used to collect data from a focus group comprising IT experts and senior management at Randwater. The Information Technology Governance Institute Framework was employed to assist in the development of the questions. The survey results were utilised during the validation of the artefact produced by this research study in a workshop. The findings were then linked with the related literature which either supported or rejected the findings through discussions on the literature and thereafter conclusions were made based on these findings. Furthermore, a literature review was conducted to gain a better understanding of what has been done in the field of research in order to assist in defining the problem that this research seeks to solve so as to inform the development of design characteristics. The research process employed the Nelson Mandela University – Design Science Strategy Methodology referred to as (NMU – DSSM) with the goal of developing an artefact in the form of a framework. The research process entailed studying the existing literature and analysing the aspects relating to corporate governance, IT governance, frameworks, and strategies to be able to measure the degree of alignment. The phases of designing the artefact were analysis, design, evaluate, validate and diffuse phases. The final artefact developed was a framework that incorporated the principles of King IV and ISO 38500 in corporate governance and ICT goals alignment. The final artefact also embedded transparency, accountability and security as important elements in the implementation of the artefact. v The survey findings were instrumental in the development of the artefact that brings alignment between business strategy and IT objectives at Randwater. From the findings, in terms of IT flexibility, it was revealed that the interrelated parts of the system at Randwater were modular. It was also concluded that there is lack of communication about the manner in which the components of the information systems are organised and integrated in order to allow for rapid changes and that the organisational IT infrastructure and applications were loosely coupled. The findings further revealed that the business had established corporate rules and standards for hardware and operating systems to ensure platform compatibility. It was also revealed that organisational IT applications were developed based on compliance guidelines. In terms of IT-enabled dynamic capabilities, it was revealed that IT systems at Randwater are not capable of scanning the environment and identifying new business opportunities and are not capable of anticipating discontinuities arising in the business domain by developing greater reactive and proactive strength. It was also revealed that it was concluded that IT systems were capable of achieving strategic alignment between IT flexibility and dynamic capabilities. Therefore, design science was the ideal research paradigm towards addressing the research problem and the artefact designed was a viable research contribution. The significance of the study was that it contributed to the development of technology-based solutions to an important and relevant business problem of alignment of business strategy to IT goals. The design evaluation, the utility, quality, and efficacy of the final design artefact was rigorously demonstrated via well-executed evaluation methods. The study also contributed to the literature available on business strategic alignment with ICT goals.
- Full Text:
- Date Issued: 2020
A gendered analysis of conditional cash based transfers: a case study of Puntland Technical Vocational Skills Training Programme, Somalia
- Authors: Chitombi, Rumbidzai
- Date: 2020
- Subjects: Puntland Technical Vocational Skills Training Programme , Transfer payments -- Somalia -- Case studies , Economic assistance, Domestic -- Somalia , Economic development -- Social aspects -- Somalia , Women -- Somalia -- Social conditions
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/167335 , vital:41469
- Description: As part of the worldwide development system, conditional cash transfer (CCT) programmes have become an increasingly popular policy and development approach in seeking to address poverty, especially in developing countries. Under the CCT programmes, beneficiaries are given assistance in the form of either cash or cash vouchers after fulfilling certain obligations of the development programme, such as attending training, enacting proper health care, or ensuring regular school attendance of children. The programmes have been described as a ‘double-edged sword’ since they aim to address poverty and, at the same time, reduce reliance on government largesse. In this regard, they are seen as potentially effective, and more empowering, alternatives to more traditional social assistance programmes whereby poor people receive welfare assistance in the form of ‘in kind’ and ‘unconditional’ assistance, receiving this as either food or shelter commodities, and without having to meet any conditions in doing so. This ‘traditional’ way of assisting poor people has largely been criticised for creating a dependency syndrome amongst the beneficiaries. In certain cases, CCT programmes focus specifically on women, either in receiving the cash transfer or in meeting the conditions attached to the programme, or both. In this context, considerable debate exists in the scholarly literature about the effects of such CCT programmes on the situation and status of women, specifically in terms of possibly empowering women. While some scholars claim that these programmes enhance the human and financial assets of women, others argue that focusing specifically on women, and as care-givers within households, tends to reproduce gender-based inequalities and subordination. Since gender equality and female empowerment are now key issues in global development spheres, and at national levels, this thesis aims to contribute to literature on the effects of CCTs on gender and women’s empowerment. This is pursued by way of a gendered perspective on CCTs as a development methodology for empowering women with reference to Somalia, using the Puntland Technical Vocational Skills Training programme as a case study. This programme focused, in the main, on internally-displaced people in Somalia, with a particular emphasis on women in meeting the programme conditions (i.e. participating in a training programme) and in being the cash recipients. The study used both quantitative and qualitative approaches for data collection and analysis, focusing on sixty selected beneficiaries who participated in the Puntland Technical Vocational skills training programme in Somalia from 2013. The thesis examines the prevailing structures (including cultural dynamics and socio-economic factors) in Somalia which lead to women’s subordination, notably in the light of significant internal displacement because of war and conflict and the emergence of internally-displaced camps. On this basis, from a gendered perspective, there is a critical appraisal of the manner in which the Puntland CCT programme affected women’s subordinate status, including how it may have led to the restructuring of gendered relations at both household and community levels. In offering this appraisal with reference to the Puntland programme, the thesis argues that women’s subordination and, by extension, women’s empowerment, is multi-faceted, and that continuity and change along the dimensions of subordination is often uneven and contradictory. Further, as also demonstrated in the Puntland case study, women’s subordination (as a social totality) is not a totalising system, such that women regularly make use of gaps in the system as opportunities to enhance their well-being without confronting the totality of the system.
- Full Text:
- Date Issued: 2020
- Authors: Chitombi, Rumbidzai
- Date: 2020
- Subjects: Puntland Technical Vocational Skills Training Programme , Transfer payments -- Somalia -- Case studies , Economic assistance, Domestic -- Somalia , Economic development -- Social aspects -- Somalia , Women -- Somalia -- Social conditions
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/167335 , vital:41469
- Description: As part of the worldwide development system, conditional cash transfer (CCT) programmes have become an increasingly popular policy and development approach in seeking to address poverty, especially in developing countries. Under the CCT programmes, beneficiaries are given assistance in the form of either cash or cash vouchers after fulfilling certain obligations of the development programme, such as attending training, enacting proper health care, or ensuring regular school attendance of children. The programmes have been described as a ‘double-edged sword’ since they aim to address poverty and, at the same time, reduce reliance on government largesse. In this regard, they are seen as potentially effective, and more empowering, alternatives to more traditional social assistance programmes whereby poor people receive welfare assistance in the form of ‘in kind’ and ‘unconditional’ assistance, receiving this as either food or shelter commodities, and without having to meet any conditions in doing so. This ‘traditional’ way of assisting poor people has largely been criticised for creating a dependency syndrome amongst the beneficiaries. In certain cases, CCT programmes focus specifically on women, either in receiving the cash transfer or in meeting the conditions attached to the programme, or both. In this context, considerable debate exists in the scholarly literature about the effects of such CCT programmes on the situation and status of women, specifically in terms of possibly empowering women. While some scholars claim that these programmes enhance the human and financial assets of women, others argue that focusing specifically on women, and as care-givers within households, tends to reproduce gender-based inequalities and subordination. Since gender equality and female empowerment are now key issues in global development spheres, and at national levels, this thesis aims to contribute to literature on the effects of CCTs on gender and women’s empowerment. This is pursued by way of a gendered perspective on CCTs as a development methodology for empowering women with reference to Somalia, using the Puntland Technical Vocational Skills Training programme as a case study. This programme focused, in the main, on internally-displaced people in Somalia, with a particular emphasis on women in meeting the programme conditions (i.e. participating in a training programme) and in being the cash recipients. The study used both quantitative and qualitative approaches for data collection and analysis, focusing on sixty selected beneficiaries who participated in the Puntland Technical Vocational skills training programme in Somalia from 2013. The thesis examines the prevailing structures (including cultural dynamics and socio-economic factors) in Somalia which lead to women’s subordination, notably in the light of significant internal displacement because of war and conflict and the emergence of internally-displaced camps. On this basis, from a gendered perspective, there is a critical appraisal of the manner in which the Puntland CCT programme affected women’s subordinate status, including how it may have led to the restructuring of gendered relations at both household and community levels. In offering this appraisal with reference to the Puntland programme, the thesis argues that women’s subordination and, by extension, women’s empowerment, is multi-faceted, and that continuity and change along the dimensions of subordination is often uneven and contradictory. Further, as also demonstrated in the Puntland case study, women’s subordination (as a social totality) is not a totalising system, such that women regularly make use of gaps in the system as opportunities to enhance their well-being without confronting the totality of the system.
- Full Text:
- Date Issued: 2020
A genetic analysis of the species and intraspecific lineages of Dactylopius Costa (Hemiptera: Dactylopiidae)
- Authors: Van Steenderen, Clarke
- Date: 2020
- Subjects: Dactylopius
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/151491 , vital:39135
- Description: The Cactaceae family comprises 15 genera and nearly 2000 species. With one exception, these are all native to the Americas. Numerous cactaceous species are invasive in other parts of the world, resulting in considerable damage to ecosystem functioning and agricultural practices. The most successful biological control agents used to combat invasive Cactaceae belong to the Dactylopius genus (Hemiptera: Dactylopiidae), comprising eleven species. The Dactylopiidae are exclusively cactophagous and are usually host-specific. Some intraspecific lineages of dactylopiids, often referred to as `biotypes', also display host-specificity, and are used to control particular species of invasive Cactaceae. To date, two lineages within Dactylopius opuntiae (`ficus' and `stricta'), and two within D. tomentosus (`cholla' and `imbricata') have been released in South Africa to control Opuntia ficus-indica and O. stricta, and Cylindropuntia fulgida and C. imbricata, respectively. The `californica var. parkeri' lineage is currently under consideration for release in South Africa for the control of C. pallida. Australia has already released these five lineages, and approved the release of an additional three in 2017; namely D. tomentosus `bigelovii', `cylindropuntia sp.', and `acanthocarpa x echinocarpa'. Many of the Dactylopius species are so morphologically similar, and in the case of lineages, identical, that numerous misidentifications have been made in the past. These errors have had serious implications, such as failed attempts at the biological control of cactus weeds. This thesis aimed to generate a multi-locus genetic database to enable the identification of the species and lineages in the Dactylopiidae family, and to test its accuracy. Seven species were included in the analysis, including two lineages within D. opuntiae and six within D. tomentosus. Genetic characterisation was achieved through the DNA sequencing of three gene regions; namely mitochondrial 12S rRNA and cytochrome c oxidase I (COI), nuclear 18S rRNA, and fragment analysis using two inter-simple sequence repeats (ISSRs). Nucleotide sequences were very effective for species-level identification, where the 12S, 18S, and COI regions showed 100%, 94.59%, and 100% identification accuracy rates, respectively. Additionally, the 12S and COI markers distinguished between half of the D. tomentosus lineages (`californica', `cholla', and `imbricata'), with identification accuracies of 100%. The `echinocarpa x acanthocarpa', `bigelovii', and `cylindropuntia sp.' lineages formed one clade. None of the DNA genetic markers showed a separation between the `ficus' and `stricta' lineages within D. opuntiae. Fragment analysis through the use of ISSRs provided higher-resolution results, and addressed this gap by showing a well-supported separation between the two lineages, and between wild populations collected in the Eastern Cape Province in South Africa. The identification accuracy of the `ficus' and `stricta' lineages was 81.82%. This is the first time that a method has been developed that can distinguish between these lineages. An additional component of this thesis was the creation of three user-friendly R-based programs to assist with: 1. ISSR data processing. 2. The identification of query Dactylopius nucleotide sequences relative to the gene databases created here. 3. A graphical user interface (GUI) version of the R package `SPIDER', which is useful for the assessment of the accuracy of genetic barcode data. A successful biological control programme relies on the correct identification of the agent in question, and so it is imperative that cactus biological control practitioners are able to distinguish between Dactylopius species and lineages in order to release the most effective ones onto target Cactaceae. The laboratory protocols reported, and data processing tools created here, have largely addressed this need and offer valuable practical applications. These include: 1. The flagging of potential new species, cryptic species, and lineages of dactylopiid species released as new biocontrol agents. 2. Validating the identifications made by taxonomists based on morphology. 3. Confirming to which species, and, where applicable, to which lineage, a field-collected sample belongs. 4. Identifying hybrids resulting from lineage crosses. Ensuring that the correct Dactylopius species are utilised for biological control will improve the control of invasive Cactaceae and protect biodiversity and agricultural productivity.
- Full Text:
- Date Issued: 2020
- Authors: Van Steenderen, Clarke
- Date: 2020
- Subjects: Dactylopius
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/151491 , vital:39135
- Description: The Cactaceae family comprises 15 genera and nearly 2000 species. With one exception, these are all native to the Americas. Numerous cactaceous species are invasive in other parts of the world, resulting in considerable damage to ecosystem functioning and agricultural practices. The most successful biological control agents used to combat invasive Cactaceae belong to the Dactylopius genus (Hemiptera: Dactylopiidae), comprising eleven species. The Dactylopiidae are exclusively cactophagous and are usually host-specific. Some intraspecific lineages of dactylopiids, often referred to as `biotypes', also display host-specificity, and are used to control particular species of invasive Cactaceae. To date, two lineages within Dactylopius opuntiae (`ficus' and `stricta'), and two within D. tomentosus (`cholla' and `imbricata') have been released in South Africa to control Opuntia ficus-indica and O. stricta, and Cylindropuntia fulgida and C. imbricata, respectively. The `californica var. parkeri' lineage is currently under consideration for release in South Africa for the control of C. pallida. Australia has already released these five lineages, and approved the release of an additional three in 2017; namely D. tomentosus `bigelovii', `cylindropuntia sp.', and `acanthocarpa x echinocarpa'. Many of the Dactylopius species are so morphologically similar, and in the case of lineages, identical, that numerous misidentifications have been made in the past. These errors have had serious implications, such as failed attempts at the biological control of cactus weeds. This thesis aimed to generate a multi-locus genetic database to enable the identification of the species and lineages in the Dactylopiidae family, and to test its accuracy. Seven species were included in the analysis, including two lineages within D. opuntiae and six within D. tomentosus. Genetic characterisation was achieved through the DNA sequencing of three gene regions; namely mitochondrial 12S rRNA and cytochrome c oxidase I (COI), nuclear 18S rRNA, and fragment analysis using two inter-simple sequence repeats (ISSRs). Nucleotide sequences were very effective for species-level identification, where the 12S, 18S, and COI regions showed 100%, 94.59%, and 100% identification accuracy rates, respectively. Additionally, the 12S and COI markers distinguished between half of the D. tomentosus lineages (`californica', `cholla', and `imbricata'), with identification accuracies of 100%. The `echinocarpa x acanthocarpa', `bigelovii', and `cylindropuntia sp.' lineages formed one clade. None of the DNA genetic markers showed a separation between the `ficus' and `stricta' lineages within D. opuntiae. Fragment analysis through the use of ISSRs provided higher-resolution results, and addressed this gap by showing a well-supported separation between the two lineages, and between wild populations collected in the Eastern Cape Province in South Africa. The identification accuracy of the `ficus' and `stricta' lineages was 81.82%. This is the first time that a method has been developed that can distinguish between these lineages. An additional component of this thesis was the creation of three user-friendly R-based programs to assist with: 1. ISSR data processing. 2. The identification of query Dactylopius nucleotide sequences relative to the gene databases created here. 3. A graphical user interface (GUI) version of the R package `SPIDER', which is useful for the assessment of the accuracy of genetic barcode data. A successful biological control programme relies on the correct identification of the agent in question, and so it is imperative that cactus biological control practitioners are able to distinguish between Dactylopius species and lineages in order to release the most effective ones onto target Cactaceae. The laboratory protocols reported, and data processing tools created here, have largely addressed this need and offer valuable practical applications. These include: 1. The flagging of potential new species, cryptic species, and lineages of dactylopiid species released as new biocontrol agents. 2. Validating the identifications made by taxonomists based on morphology. 3. Confirming to which species, and, where applicable, to which lineage, a field-collected sample belongs. 4. Identifying hybrids resulting from lineage crosses. Ensuring that the correct Dactylopius species are utilised for biological control will improve the control of invasive Cactaceae and protect biodiversity and agricultural productivity.
- Full Text:
- Date Issued: 2020
A Geochemical Comparison of Southern African Stromatolites and Stromatolite Pools
- Authors: Dodd, Carla
- Date: 2020
- Subjects: Stromatolites
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48235 , vital:40527
- Description: Microbialite accretion takes place via either mineral precipitation, the trapping and binding of mineral and sediment grains, or a combination of the two. Recently, the geochemistry of carbonate deposits, including microbialites, has been used to reconstruct palaeoenvironments and infer biogenicity. Numerous modern stromatolite (layered microbialites) systems are located on the southern African coastline and are formed predominantly by mineral precipitation with minor detrital input. In order to better understand the environmental and biological processes influencing the formation of microbialites, the geochemistry of southern African coastalstromatolites is examined. This is done by a spatial comparison of the hydrochemistry as well as the major and trace element geochemistry of various coastal stromatolite systems. The influence of the underlying geology on the composition of the stromatolites forms a particular focus of the study. In addition, the effect of metazoans on the micro-fabrics and sediment incorporation into the stromatolite matrix is assessed. Finally, the trace element geochemistry of active, inactive, and ancient stromatolites is compared with a speleothem sample in order to test the validity of using trace elements as a means to determine biogenicity of deposition. Results show that the bulk geochemistry of the South African stromatolites is not a simple function of the associated bedrock lithologies, although certain parallels do exist. It was found that metazoans indirectly influence sediment incorporation by increasing porosity and thereby accommodation space for detrital input. Furthermore, trace element signatures could not be directly attributed to microbial influence in the deposition of the carbonates. Ultimately, this study provides valuable insights into the formation processes of the active South African stromatolites and the use of trace elements as a geochemical tool to investigate the evolution of life and determine past environmental conditions.
- Full Text:
- Date Issued: 2020
- Authors: Dodd, Carla
- Date: 2020
- Subjects: Stromatolites
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48235 , vital:40527
- Description: Microbialite accretion takes place via either mineral precipitation, the trapping and binding of mineral and sediment grains, or a combination of the two. Recently, the geochemistry of carbonate deposits, including microbialites, has been used to reconstruct palaeoenvironments and infer biogenicity. Numerous modern stromatolite (layered microbialites) systems are located on the southern African coastline and are formed predominantly by mineral precipitation with minor detrital input. In order to better understand the environmental and biological processes influencing the formation of microbialites, the geochemistry of southern African coastalstromatolites is examined. This is done by a spatial comparison of the hydrochemistry as well as the major and trace element geochemistry of various coastal stromatolite systems. The influence of the underlying geology on the composition of the stromatolites forms a particular focus of the study. In addition, the effect of metazoans on the micro-fabrics and sediment incorporation into the stromatolite matrix is assessed. Finally, the trace element geochemistry of active, inactive, and ancient stromatolites is compared with a speleothem sample in order to test the validity of using trace elements as a means to determine biogenicity of deposition. Results show that the bulk geochemistry of the South African stromatolites is not a simple function of the associated bedrock lithologies, although certain parallels do exist. It was found that metazoans indirectly influence sediment incorporation by increasing porosity and thereby accommodation space for detrital input. Furthermore, trace element signatures could not be directly attributed to microbial influence in the deposition of the carbonates. Ultimately, this study provides valuable insights into the formation processes of the active South African stromatolites and the use of trace elements as a geochemical tool to investigate the evolution of life and determine past environmental conditions.
- Full Text:
- Date Issued: 2020
A holistic approach in understanding the effects of dietary protein sources on the growth and reproductive development of farmed abalone, Haliotis midae
- Wu, Yu
- Authors: Wu, Yu
- Date: 2020
- Subjects: Abalones -- Nutrition , Abalones -- Reproduction , Abalones -- Growth , Abalone culture , Haliotis midae -- Nutrition , Haliotis midae -- Reproduction , Haliotis midae -- Growth , Haliotis midae fisheries
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/167719 , vital:41506
- Description: The combination of fishmeal and soya in the formulated feed of farmed South African abalone, Haliotis midae, not only improved abalone growth, but also the sustainability of the compound diets by reducing the reliance on fishmeal. However, the presence of soya produced larger gonads compared to those of abalone fed kelp or single-source protein diets. There is an increasing drive to control sexual maturation and reduce undesirable spawning events in farmed abalone. However, the reasons for the reported effects of soya inclusion on the reproductive development of farmed H. midae remain unresolved. The aim of this research was to use a combination of techniques to contribute to the understanding of the relationship between growth, reproductive and nutritional physiology of farmed H. midae fed diets of varying protein sources. These techniques included stable isotope analysis (SIA), fatty acid analysis, gonad histological assessments and haemolymph sexsteroid hormone analysis. The objectives were to examine the allocation of protein and nutritional components to somatic and reproductive tissues. This study also included the first attempt to investigate the role that sex steroid hormones play during gametogenesis. Abalone (40 – 50 g abalone-1) were fed one of four diets: either a single-source protein-based diet, i.e., (1) fishmeal-only (FM) or (2) soya-only (S), or a combination diet of (3) fishmeal-soya (FM S) or (4) fishmeal-sunflower meal (FM SM). Sampling occurred in 45-day intervals over one year. Dietary protein source had an effect on the growth of abalone, with enhancements in growth linked to the combination of fishmeal and a plant-protein source. The fishmeal ingredient was the most utilised protein source throughout the temporal changes in protein allocation into somatic and reproductive tissue, followed by soya and then sunflower meal. The mean whole- body mass of abalone was significantly influenced by an interaction between time and dietary treatment, with average whole-body mass changing differently over time between treatments (RM-ANOVA, F(24, 96) = 2.13, p = 0.005). Overall, abalone that were fed FM S had higher mean whole-body mass values than abalone that were fed the single-protein based diets, while abalone that were fed FM SM were similar to animals from all dietary treatments (RMANOVA, F(3, 12) = 5.75, p = 0.01). Male abalone had significantly higher gonad bulk index (GBI) values compared to females (RM-ANOVA, F(1, 24) = 49.03, p < 0.001) and this was independent of dietary treatment. Within each sex, female abalone fed the FM S diet (15.92 ± 1.88 mm3 g-1) had significantly higher GBI values than abalone fed S (9.76 ± 1.08 mm3 g-1), while abalone fed FM (11.96 ± 1.71 mm3 g-1) and FM SM (11.90 ± 0.80 mm3 g-1) were similar to abalone from all other dietary treatments (Tukey’s HSD, p < 0.05). Male abalone fed the FM S (21.59 ± 2.10 mm3 g-1) and FM SM diet (19.30 ± 2.63 mm3 g-1) had similar GBI values and they were significantly higher than in abalone fed the S diet (14.74 ± 1.27 mm3 g-1), while abalone fed FM S had significantly higher GBI values than abalone that consumed the FM diet (15.08 ±1.63mm3 g-1) ( Tukey’s HSD, p < 0.05). Although sunflower meal was poorly utilised, it produced similar overall growth to abalone that were fed the FM S diets. Yet, feed conversion ratio values were significantly lower for abalone fed FM S (1.30 ± 0.13) compared to those in the other three treatments, with ratios ranging from 1.65 – 1.72 over the one-year. The fatty acid compositions of the somatic and gonadal tissues were similar between treatments (PERMANOVA, p = 0.21), while fatty acid composition was influenced by sampling day, tissue type and abalone sex (PERMANOVA, p < 0.05). The essential fatty acids (EFAs) eicosadienoic acid and a-linolenic acid were present in abalone tissue, but they were not detected in the diets, suggesting the important role that an alternate food source (e.g. farmed abalone also had access to diatoms) may have played and the ability that H. midae may have in converting long-chain polyunsaturated fatty acids from C18 precursors. A change in the abundance of EFAs in the gonad tissue during highest and lowest GBI values suggested that arachidonic, eicosapentaenoic, g-linolenic and linoleic acid were important in females, while eicosapentaenoic, eicosadienoic and a-linolenic acid were important for male reproductive development. Dietary protein sources had an effect on the frequency distribution of maturity stages, where females that were fed FM S produced more ripe gonads and more males that were fed FM SM contained testes that showed signs of ripeness over the one-year study. Although dietary protein influenced the sex steroid concentrations in females and males, exhibiting fluctuations throughout the one-year period, no distinct pattern linked to gametogenesis were observed. The results from this study illustrate: (1) the importance of conducting laboratory studies when implementing SIA and mixing models in aquaculture nutrition; (2) conducting nutritional studies on mature, grow-out abalone; and (3) assessing the importance of naturally occurring diatoms in their diet and their contribution to growth and reproduction. The novel contribution of this research towards abalone nutritional physiology, the implications of these findings to industry as well as potential considerations for future studies were addressed.
- Full Text:
- Date Issued: 2020
- Authors: Wu, Yu
- Date: 2020
- Subjects: Abalones -- Nutrition , Abalones -- Reproduction , Abalones -- Growth , Abalone culture , Haliotis midae -- Nutrition , Haliotis midae -- Reproduction , Haliotis midae -- Growth , Haliotis midae fisheries
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/167719 , vital:41506
- Description: The combination of fishmeal and soya in the formulated feed of farmed South African abalone, Haliotis midae, not only improved abalone growth, but also the sustainability of the compound diets by reducing the reliance on fishmeal. However, the presence of soya produced larger gonads compared to those of abalone fed kelp or single-source protein diets. There is an increasing drive to control sexual maturation and reduce undesirable spawning events in farmed abalone. However, the reasons for the reported effects of soya inclusion on the reproductive development of farmed H. midae remain unresolved. The aim of this research was to use a combination of techniques to contribute to the understanding of the relationship between growth, reproductive and nutritional physiology of farmed H. midae fed diets of varying protein sources. These techniques included stable isotope analysis (SIA), fatty acid analysis, gonad histological assessments and haemolymph sexsteroid hormone analysis. The objectives were to examine the allocation of protein and nutritional components to somatic and reproductive tissues. This study also included the first attempt to investigate the role that sex steroid hormones play during gametogenesis. Abalone (40 – 50 g abalone-1) were fed one of four diets: either a single-source protein-based diet, i.e., (1) fishmeal-only (FM) or (2) soya-only (S), or a combination diet of (3) fishmeal-soya (FM S) or (4) fishmeal-sunflower meal (FM SM). Sampling occurred in 45-day intervals over one year. Dietary protein source had an effect on the growth of abalone, with enhancements in growth linked to the combination of fishmeal and a plant-protein source. The fishmeal ingredient was the most utilised protein source throughout the temporal changes in protein allocation into somatic and reproductive tissue, followed by soya and then sunflower meal. The mean whole- body mass of abalone was significantly influenced by an interaction between time and dietary treatment, with average whole-body mass changing differently over time between treatments (RM-ANOVA, F(24, 96) = 2.13, p = 0.005). Overall, abalone that were fed FM S had higher mean whole-body mass values than abalone that were fed the single-protein based diets, while abalone that were fed FM SM were similar to animals from all dietary treatments (RMANOVA, F(3, 12) = 5.75, p = 0.01). Male abalone had significantly higher gonad bulk index (GBI) values compared to females (RM-ANOVA, F(1, 24) = 49.03, p < 0.001) and this was independent of dietary treatment. Within each sex, female abalone fed the FM S diet (15.92 ± 1.88 mm3 g-1) had significantly higher GBI values than abalone fed S (9.76 ± 1.08 mm3 g-1), while abalone fed FM (11.96 ± 1.71 mm3 g-1) and FM SM (11.90 ± 0.80 mm3 g-1) were similar to abalone from all other dietary treatments (Tukey’s HSD, p < 0.05). Male abalone fed the FM S (21.59 ± 2.10 mm3 g-1) and FM SM diet (19.30 ± 2.63 mm3 g-1) had similar GBI values and they were significantly higher than in abalone fed the S diet (14.74 ± 1.27 mm3 g-1), while abalone fed FM S had significantly higher GBI values than abalone that consumed the FM diet (15.08 ±1.63mm3 g-1) ( Tukey’s HSD, p < 0.05). Although sunflower meal was poorly utilised, it produced similar overall growth to abalone that were fed the FM S diets. Yet, feed conversion ratio values were significantly lower for abalone fed FM S (1.30 ± 0.13) compared to those in the other three treatments, with ratios ranging from 1.65 – 1.72 over the one-year. The fatty acid compositions of the somatic and gonadal tissues were similar between treatments (PERMANOVA, p = 0.21), while fatty acid composition was influenced by sampling day, tissue type and abalone sex (PERMANOVA, p < 0.05). The essential fatty acids (EFAs) eicosadienoic acid and a-linolenic acid were present in abalone tissue, but they were not detected in the diets, suggesting the important role that an alternate food source (e.g. farmed abalone also had access to diatoms) may have played and the ability that H. midae may have in converting long-chain polyunsaturated fatty acids from C18 precursors. A change in the abundance of EFAs in the gonad tissue during highest and lowest GBI values suggested that arachidonic, eicosapentaenoic, g-linolenic and linoleic acid were important in females, while eicosapentaenoic, eicosadienoic and a-linolenic acid were important for male reproductive development. Dietary protein sources had an effect on the frequency distribution of maturity stages, where females that were fed FM S produced more ripe gonads and more males that were fed FM SM contained testes that showed signs of ripeness over the one-year study. Although dietary protein influenced the sex steroid concentrations in females and males, exhibiting fluctuations throughout the one-year period, no distinct pattern linked to gametogenesis were observed. The results from this study illustrate: (1) the importance of conducting laboratory studies when implementing SIA and mixing models in aquaculture nutrition; (2) conducting nutritional studies on mature, grow-out abalone; and (3) assessing the importance of naturally occurring diatoms in their diet and their contribution to growth and reproduction. The novel contribution of this research towards abalone nutritional physiology, the implications of these findings to industry as well as potential considerations for future studies were addressed.
- Full Text:
- Date Issued: 2020
A housing affordability and tenure of choice quantum deliverable model in South Africa
- Authors: Kabundu, Emmanuel Kizito
- Date: 2020
- Subjects: Housing -- Prices -- South Africa Housing -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/49606 , vital:41740
- Description: The aim of this research was to develop a model that practically determines the tenure of choice and affordability of households in South Africa, which will thus help towards informed decision making by analysts and housing officials. Presently, there is no clear systematic means (except for simplistic ratios) of determining the degree of the effect of changes in the housing market (such as implemented policies) on the tenure of choice and affordability decisions of households. The research set out to improve upon the usage of ratios by basing its analysis on the theoretical underpinnings of both user costs of occupancy and an assumption of endogeneity between tenure of choice and affordability. The research used the general household survey data from Statistics South Africa for the analysis and validation. Generalized joint binary regression (on assumption of endogeneity between tenure of choice and affordability) was used as a check against the user costs of occupancy modelling. An independent market analysis carried out showed that South Africa has consistently faced increasing problems of acute housing shortages and housing affordability. Never the less, apart from subsidy programs, the option to promote renting, coupled with use of innovative building technologies showed promise of significantly alleviating these problems. More living space is especially more vital than ever, amid the current crisis of COVID-19 pademic. Statistical tests indicated strong evidence suggesting that the developed user costs of occupancy model (dynamic tenure model) is reliable at correctly recovering the tenure statuses of the households, with its recovery rates being better than those of the regression model. Both models provided useful unique, but different insights into the housing market and also correctly predicted the behavioural patterns of South African housing markets, such as significantly worsening affordability, and a market that is biased towards home ownership. The analysis also showed that affordability and tenure of choice were significantly affected by locational factors, household characteristics (such as race and age of household head), and most significantly, the age of the household head (which is a proxy to household income). The research successfully met its goal of model building but also recognized the need to merge these two models (dynamic tenure model and the regression model) into one model for more comprehensive housing related analysis. The research also recognized a need to fully operationalize the optimization, Monte Carlo and parallelization modules in order to improve the practical usefulness and effectiveness of the model. The significance of the study is that it it underpins the basis for proper tenure and affordability analysis, by assuming endogeneity between the two (2), and provides a modelling framework based on these criteria, that are useful for meaningful housing market analysis.
- Full Text:
- Date Issued: 2020
- Authors: Kabundu, Emmanuel Kizito
- Date: 2020
- Subjects: Housing -- Prices -- South Africa Housing -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/49606 , vital:41740
- Description: The aim of this research was to develop a model that practically determines the tenure of choice and affordability of households in South Africa, which will thus help towards informed decision making by analysts and housing officials. Presently, there is no clear systematic means (except for simplistic ratios) of determining the degree of the effect of changes in the housing market (such as implemented policies) on the tenure of choice and affordability decisions of households. The research set out to improve upon the usage of ratios by basing its analysis on the theoretical underpinnings of both user costs of occupancy and an assumption of endogeneity between tenure of choice and affordability. The research used the general household survey data from Statistics South Africa for the analysis and validation. Generalized joint binary regression (on assumption of endogeneity between tenure of choice and affordability) was used as a check against the user costs of occupancy modelling. An independent market analysis carried out showed that South Africa has consistently faced increasing problems of acute housing shortages and housing affordability. Never the less, apart from subsidy programs, the option to promote renting, coupled with use of innovative building technologies showed promise of significantly alleviating these problems. More living space is especially more vital than ever, amid the current crisis of COVID-19 pademic. Statistical tests indicated strong evidence suggesting that the developed user costs of occupancy model (dynamic tenure model) is reliable at correctly recovering the tenure statuses of the households, with its recovery rates being better than those of the regression model. Both models provided useful unique, but different insights into the housing market and also correctly predicted the behavioural patterns of South African housing markets, such as significantly worsening affordability, and a market that is biased towards home ownership. The analysis also showed that affordability and tenure of choice were significantly affected by locational factors, household characteristics (such as race and age of household head), and most significantly, the age of the household head (which is a proxy to household income). The research successfully met its goal of model building but also recognized the need to merge these two models (dynamic tenure model and the regression model) into one model for more comprehensive housing related analysis. The research also recognized a need to fully operationalize the optimization, Monte Carlo and parallelization modules in order to improve the practical usefulness and effectiveness of the model. The significance of the study is that it it underpins the basis for proper tenure and affordability analysis, by assuming endogeneity between the two (2), and provides a modelling framework based on these criteria, that are useful for meaningful housing market analysis.
- Full Text:
- Date Issued: 2020
A lean production approach to materials management in the Nigerian construction industry
- Authors: Albert, Idowu
- Date: 2020
- Subjects: Materials management , Lean manufacturing Construction industry -- Nigeria
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/46008 , vital:39408
- Description: The Nigerian Construction Industry faces a problem of poor materials management that leads to, among other things, materials waste, poor quality of work, poor materials flow, project delay and cost overrun. Overcoming these challenges, requires the rethinking the current modus operandi of the Nigerian construction industry. One such method that has been espoused as having potential to improve materials management, and associated challenges is ‘lean production’. This research aimed at deciphering the lean approach to production management with a view of extracting its utility in enhancing materials management in the construction industry. The qualitative method of research inquiry that is rooted in the phenomenological paradigm was employed. The research activities included a comprehensive review of the related literature and study of selected cases. Abuja, the Federal capital territory of Nigeria was the selected geographical scope of the research. Ten case studies were purposefully selected for the study. The research instrument was a tick box used for direct observation. The study revealed that poor materials management has a negative effect on the materials management plan. Moreover, mixing of waste at the site, negates the effort for identification of materials waste streams, and makes it difficult to account for materials waste, as well as implementing a materials waste management policy on sites. The research also found that poor materials management has a significant effect (high, moderate or low) on materials waste, quality of work, materials flow, productivity, project delay, project profitability and accounting for materials. The research has developed a conceptual model for a lean production approach to materials management based on the results and informed by the theoretical framework. The study has achieved its aim of establishing an understanding of the lean production approach to materials management in the Nigerian construction industry. The study recommends that construction professionals should be well informed on the effects of poor materials management.
- Full Text:
- Date Issued: 2020
- Authors: Albert, Idowu
- Date: 2020
- Subjects: Materials management , Lean manufacturing Construction industry -- Nigeria
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/46008 , vital:39408
- Description: The Nigerian Construction Industry faces a problem of poor materials management that leads to, among other things, materials waste, poor quality of work, poor materials flow, project delay and cost overrun. Overcoming these challenges, requires the rethinking the current modus operandi of the Nigerian construction industry. One such method that has been espoused as having potential to improve materials management, and associated challenges is ‘lean production’. This research aimed at deciphering the lean approach to production management with a view of extracting its utility in enhancing materials management in the construction industry. The qualitative method of research inquiry that is rooted in the phenomenological paradigm was employed. The research activities included a comprehensive review of the related literature and study of selected cases. Abuja, the Federal capital territory of Nigeria was the selected geographical scope of the research. Ten case studies were purposefully selected for the study. The research instrument was a tick box used for direct observation. The study revealed that poor materials management has a negative effect on the materials management plan. Moreover, mixing of waste at the site, negates the effort for identification of materials waste streams, and makes it difficult to account for materials waste, as well as implementing a materials waste management policy on sites. The research also found that poor materials management has a significant effect (high, moderate or low) on materials waste, quality of work, materials flow, productivity, project delay, project profitability and accounting for materials. The research has developed a conceptual model for a lean production approach to materials management based on the results and informed by the theoretical framework. The study has achieved its aim of establishing an understanding of the lean production approach to materials management in the Nigerian construction industry. The study recommends that construction professionals should be well informed on the effects of poor materials management.
- Full Text:
- Date Issued: 2020
A management model for human settlements: a case study of Nigeria and South Africa
- Authors: Adeniran, Adeleye Ayoade
- Date: 2020
- Subjects: Human settlements -- Nigeria , Human settlements -- South Africa Sustainable development
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/45985 , vital:39403
- Description: Persistent depreciating human settlements is a global challenge, particularly in developing countries and this challenge contributes to the continuously increasing housing gap, despite several novel policies and programmes. Although there is a dearth of research-based literature on human settlements management, studies show that property management, Facility Management, housing management and urban management impact the sustainability of all these built environment milieus which form part of the human settlements’ sub-components. This research aimed at altering the afore-said challenge by exploring the management of human settlements in Nigeria and in South Africa. Philosophically, the research is pragmatic, and it rests on positivist deductive reasoning. The methods used for data collection include a review of literature, collection of archival records, and empirical studies of purposively selected professionals and stakeholders involved in human settlements’ management in Nigeria and in South Africa. The findings indicate that existing human settlements in the case studies are “good” and “acceptable” with the majority adopting an outsourced method of management. Furthermore, the lack of maintenance records, the deficiency in policy monitoring and the training of management and maintenance personnel were the three highest ranking factors indicated to be affecting human settlements management. Moreover, an inhabitant’s income, the time available for management, professional expertise and technology employed for management are recognised as the critical sustainability sub-factors affecting human settlement management. The factor analysis established ownership, human resource and capital, social, legal, technology, economic, physical and environmental factors as vital and very significant in achieving sustainable management of human settlements. The study recommends the professionalisation of the field of human settlements as well as a formulation of management policy among others. The study developed a management model for human settlements, and it advocates that human settlements managers, owners and organisations should apply the model in this study, to improve their human settlement management practices, so as to achieve sustainability, and in essence, Sustainable Development Goal 11. It is hoped that the suggested management model will influence human settlement policy development and review, the designing of human settlement management programmes including the framework for their ongoing monitoring and evaluation. The study furthermore contributes to the development of housing and human settlement curricula and evolving human settlement research in both developed and developing countries.
- Full Text:
- Date Issued: 2020
- Authors: Adeniran, Adeleye Ayoade
- Date: 2020
- Subjects: Human settlements -- Nigeria , Human settlements -- South Africa Sustainable development
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/45985 , vital:39403
- Description: Persistent depreciating human settlements is a global challenge, particularly in developing countries and this challenge contributes to the continuously increasing housing gap, despite several novel policies and programmes. Although there is a dearth of research-based literature on human settlements management, studies show that property management, Facility Management, housing management and urban management impact the sustainability of all these built environment milieus which form part of the human settlements’ sub-components. This research aimed at altering the afore-said challenge by exploring the management of human settlements in Nigeria and in South Africa. Philosophically, the research is pragmatic, and it rests on positivist deductive reasoning. The methods used for data collection include a review of literature, collection of archival records, and empirical studies of purposively selected professionals and stakeholders involved in human settlements’ management in Nigeria and in South Africa. The findings indicate that existing human settlements in the case studies are “good” and “acceptable” with the majority adopting an outsourced method of management. Furthermore, the lack of maintenance records, the deficiency in policy monitoring and the training of management and maintenance personnel were the three highest ranking factors indicated to be affecting human settlements management. Moreover, an inhabitant’s income, the time available for management, professional expertise and technology employed for management are recognised as the critical sustainability sub-factors affecting human settlement management. The factor analysis established ownership, human resource and capital, social, legal, technology, economic, physical and environmental factors as vital and very significant in achieving sustainable management of human settlements. The study recommends the professionalisation of the field of human settlements as well as a formulation of management policy among others. The study developed a management model for human settlements, and it advocates that human settlements managers, owners and organisations should apply the model in this study, to improve their human settlement management practices, so as to achieve sustainability, and in essence, Sustainable Development Goal 11. It is hoped that the suggested management model will influence human settlement policy development and review, the designing of human settlement management programmes including the framework for their ongoing monitoring and evaluation. The study furthermore contributes to the development of housing and human settlement curricula and evolving human settlement research in both developed and developing countries.
- Full Text:
- Date Issued: 2020
A mixed methods investigation of students’ attitudes towards statistics and quantitative research methods: a focus on postgraduate psychology students at a South African university
- Authors: Ngantweni, Xolelwa
- Date: 2020
- Subjects: Fetal alcohol spectrum disorders -- South Africa , Statistics , Psychology -- Research , College students -- South Africa -- Attitudes , Psychology -- Research -- South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/140490 , vital:37894
- Description: Many University programs offer a course in either basic or intermediate statistics as part of the degree requirements prior to graduation (McGrath, Ferns, Greiner, Wanamaker and Brown, 2015). These statistics or quantitative research methods courses are integral in helping students gain vital skills in analysing quantitative data. Research (Schau, Stevens, Dauphinee, and Del Vecchio, 1995) does however indicate that most students have a perfunctory disposition towards these courses. My study sought to particularly investigate attitudes towards statistics and quantitative research methods amongst a sample of 61 postgraduate Psychology students at Rhodes University undertaking a ‘Quantitative Research Methods’ course as part of their degree offering. A mixed methods approach was used to investigate students’ attitudes towards statistics and quantitative research methods. The Survey of Attitudes Toward Statistics (SATS-36) (Schau, 2003) captured student’s attitudes towards statistics using a Likert Scale instrument; whereas detailed qualitative interviews accentuated findings from the SATS-36. Key quantitative findings from the SATS-36 including students’ perceptions of statistics being a difficult course as well as students having a low affect towards statistics are detailed. Key qualitative findings related to why students experience statistics anxiety such as students’ (1) fear of failing statistics, (2) The late introduction of statistics in the Psychology curriculum, and (3) The role of educator/s in alleviating or promoting feelings of statistics anxiety are noted. The significance of these findings as well as the contributions of the study to the teaching and learning of statistics and quantitative research methods courses at Rhodes University are explored, in light of other studies on the topic of statistics anxiety and attitudes towards statistics/ quantitative research methods.
- Full Text:
- Date Issued: 2020
- Authors: Ngantweni, Xolelwa
- Date: 2020
- Subjects: Fetal alcohol spectrum disorders -- South Africa , Statistics , Psychology -- Research , College students -- South Africa -- Attitudes , Psychology -- Research -- South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/140490 , vital:37894
- Description: Many University programs offer a course in either basic or intermediate statistics as part of the degree requirements prior to graduation (McGrath, Ferns, Greiner, Wanamaker and Brown, 2015). These statistics or quantitative research methods courses are integral in helping students gain vital skills in analysing quantitative data. Research (Schau, Stevens, Dauphinee, and Del Vecchio, 1995) does however indicate that most students have a perfunctory disposition towards these courses. My study sought to particularly investigate attitudes towards statistics and quantitative research methods amongst a sample of 61 postgraduate Psychology students at Rhodes University undertaking a ‘Quantitative Research Methods’ course as part of their degree offering. A mixed methods approach was used to investigate students’ attitudes towards statistics and quantitative research methods. The Survey of Attitudes Toward Statistics (SATS-36) (Schau, 2003) captured student’s attitudes towards statistics using a Likert Scale instrument; whereas detailed qualitative interviews accentuated findings from the SATS-36. Key quantitative findings from the SATS-36 including students’ perceptions of statistics being a difficult course as well as students having a low affect towards statistics are detailed. Key qualitative findings related to why students experience statistics anxiety such as students’ (1) fear of failing statistics, (2) The late introduction of statistics in the Psychology curriculum, and (3) The role of educator/s in alleviating or promoting feelings of statistics anxiety are noted. The significance of these findings as well as the contributions of the study to the teaching and learning of statistics and quantitative research methods courses at Rhodes University are explored, in light of other studies on the topic of statistics anxiety and attitudes towards statistics/ quantitative research methods.
- Full Text:
- Date Issued: 2020
A model for the detection of breast cancer using machine learning and thermal images in a mobile environment
- Authors: Lennox, Nicholas
- Date: 2020
- Subjects: Breast -- Cancer -- Imaging , Breast -- Imaging Mobile communication systems
- Language: English
- Type: Thesis , Masters , MIT
- Identifier: http://hdl.handle.net/10948/46097 , vital:39492
- Description: Breast cancer is the most common cancer amongst women and one of the deadliest. Various modalities exist which image the breasts, all with a focus on early detection; thermography is one such method. It is a non-invasive test, which is safe and can be used for a wide variety of breast densities. It functions by analysing thermal patterns captured via an infrared camera of the surface of the breast. Advances in infrared and mobile technology enable this modality to be mobile based; allowing a high degree of portability at a lower cost. Furthermore, as technology has improved, machine learning has played a larger role in medical practices by offering unbiased, consistent, and timely second opinions. Machine learning algorithms are able to classify medical images automatically if offered in the correct format. This study aims to provide a model, which integrates breast cancer detection, thermal imaging, machine learning, and mobile technology. The conceptual model is theorised from three literature studies regarding: identifiable aspects of breast cancer through thermal imaging, the mobile ecosystem, and classification using machine learning algorithms. The model is implemented and evaluated using an experiment designed to classify automatically thermal breast images of the same quality that mobile attachable thermal cameras are able to capture. The experiment contrasts various combinations of segmentation methods, extracted features, and classification algorithms. Promising results were shown in the experiment with a high degree of accuracy obtained. The successful results obtained from the experimentation process validates the feasibility of the model.
- Full Text:
- Date Issued: 2020
- Authors: Lennox, Nicholas
- Date: 2020
- Subjects: Breast -- Cancer -- Imaging , Breast -- Imaging Mobile communication systems
- Language: English
- Type: Thesis , Masters , MIT
- Identifier: http://hdl.handle.net/10948/46097 , vital:39492
- Description: Breast cancer is the most common cancer amongst women and one of the deadliest. Various modalities exist which image the breasts, all with a focus on early detection; thermography is one such method. It is a non-invasive test, which is safe and can be used for a wide variety of breast densities. It functions by analysing thermal patterns captured via an infrared camera of the surface of the breast. Advances in infrared and mobile technology enable this modality to be mobile based; allowing a high degree of portability at a lower cost. Furthermore, as technology has improved, machine learning has played a larger role in medical practices by offering unbiased, consistent, and timely second opinions. Machine learning algorithms are able to classify medical images automatically if offered in the correct format. This study aims to provide a model, which integrates breast cancer detection, thermal imaging, machine learning, and mobile technology. The conceptual model is theorised from three literature studies regarding: identifiable aspects of breast cancer through thermal imaging, the mobile ecosystem, and classification using machine learning algorithms. The model is implemented and evaluated using an experiment designed to classify automatically thermal breast images of the same quality that mobile attachable thermal cameras are able to capture. The experiment contrasts various combinations of segmentation methods, extracted features, and classification algorithms. Promising results were shown in the experiment with a high degree of accuracy obtained. The successful results obtained from the experimentation process validates the feasibility of the model.
- Full Text:
- Date Issued: 2020
A morphogenetic study of ESD inclusion in Namibia’s Senior Primary English curriculum: a case study of the Khomas Region
- Authors: Malua, Anelly Ndapewa
- Date: 2020
- Subjects: Sustanable development -- Study and teaching -- Namibia , Environmental education -- Namibia , English language -- Study and teaching (Elementary) -- Namibia , Schools -- Namibia -- Curricula , Social change
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/142865 , vital:38124
- Description: Education policies are designed to structure and direct the content and process of the education that citizens receive. This includes the advancement of the Education for Sustainable Development (ESD) policy in formal school curricula. If effectively implemented, ESD can be a significant educational intervention in southern African countries’ development trajectories. ESD incorporates the environmental, social and economic pillars of Sustainable Development and it has the potential to curb issues such as poverty reduction, climate change, biodiversity loss and unsustainable patterns of consumption and production. This qualitative case study investigated factors that have historically shaped, and currently shape, the emergence of ESD implementation in the Senior Primary English curriculum in the Khomas Region of Namibia. As a critical realist enquiry, the study sought to go beyond interpretations of the empirical to identify causal mechanisms in the domains of ‘the actual’ and ‘the real’. The study was guided by Margaret Archer’s theory of Morphogenesis / Morphostasis and her methodological tool of ‘analytical dualism’. The case record consisted of educational documents, teacher questionnaires and semistructured interviews. The morphogenetic approach highlighted how the implementation of ESD through the Senior Primary English curriculum from 1990 to 2018 was conditioned by the interplay of social and cultural structures and mechanisms and human agency, particularly teachers’ agency. The study revealed that although ESD implementation has emerged in the Senior Primary English curriculum, its emergence is not synchronous with the structural and agential entities. The findings point to a policy-structure mismatch which has relevance for policy makers, practitioners and other ESD stakeholders. The significance of this study is that it stands to fill a research gap regarding ESD implementation in Namibia’s Senior Primary English curriculum. The study makes recommendations for tangible ways to strengthen ESD practice in Senior Primary English teaching in Namibia such as increasing professional development opportunities to orientate teachers to ESD, strengthening networks that can build teacher agency in relation to ESD, and promoting a theme-based approach to ESD practice in English Language teaching.
- Full Text:
- Date Issued: 2020
- Authors: Malua, Anelly Ndapewa
- Date: 2020
- Subjects: Sustanable development -- Study and teaching -- Namibia , Environmental education -- Namibia , English language -- Study and teaching (Elementary) -- Namibia , Schools -- Namibia -- Curricula , Social change
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/142865 , vital:38124
- Description: Education policies are designed to structure and direct the content and process of the education that citizens receive. This includes the advancement of the Education for Sustainable Development (ESD) policy in formal school curricula. If effectively implemented, ESD can be a significant educational intervention in southern African countries’ development trajectories. ESD incorporates the environmental, social and economic pillars of Sustainable Development and it has the potential to curb issues such as poverty reduction, climate change, biodiversity loss and unsustainable patterns of consumption and production. This qualitative case study investigated factors that have historically shaped, and currently shape, the emergence of ESD implementation in the Senior Primary English curriculum in the Khomas Region of Namibia. As a critical realist enquiry, the study sought to go beyond interpretations of the empirical to identify causal mechanisms in the domains of ‘the actual’ and ‘the real’. The study was guided by Margaret Archer’s theory of Morphogenesis / Morphostasis and her methodological tool of ‘analytical dualism’. The case record consisted of educational documents, teacher questionnaires and semistructured interviews. The morphogenetic approach highlighted how the implementation of ESD through the Senior Primary English curriculum from 1990 to 2018 was conditioned by the interplay of social and cultural structures and mechanisms and human agency, particularly teachers’ agency. The study revealed that although ESD implementation has emerged in the Senior Primary English curriculum, its emergence is not synchronous with the structural and agential entities. The findings point to a policy-structure mismatch which has relevance for policy makers, practitioners and other ESD stakeholders. The significance of this study is that it stands to fill a research gap regarding ESD implementation in Namibia’s Senior Primary English curriculum. The study makes recommendations for tangible ways to strengthen ESD practice in Senior Primary English teaching in Namibia such as increasing professional development opportunities to orientate teachers to ESD, strengthening networks that can build teacher agency in relation to ESD, and promoting a theme-based approach to ESD practice in English Language teaching.
- Full Text:
- Date Issued: 2020
A multimodal analysis of the representations of gender in contemporary South African children’s picture books produced by Book Dash
- Authors: Heydenrych, Ellen Frances
- Date: 2020
- Subjects: Book Dash (South Africa) , Picture books for children -- South Africa , Sex role in literature , Patriarchy in literature , Children's literature, South African (English) -- 21st century -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/164284 , vital:41106
- Description: In response to a demand for quality children’s picture books written and published by South Africans for local children, Book Dash – a South African non-profit organisation – has devised a publishing model in which they produce high quality children’s picture books in a twelve-hour period. Their aim is to publish books that represent a diverse range of South African children. However, while their objective is to create books that are representative of many races, this representation happens through gendered characters. In this thesis, I explore the representation of gender in Book Dash’s picture books. I use a combination of visual social semiotics, narrative theory, and critical discourse analysis, specifically focusing on the gendered ways in which the characters are represented. My analysis of these books shows how complex it can be to contest regimes of representation that work to fix patriarchal discourses and gender inequality. My findings reveal a paradox in the representation of gender norms in female characters, as some girl child characters are represented in roles that challenge gender norms, while female adult characters are consistently represented as conforming to the patriarchal feminine ideal. There is also a notable lack of father figures in these books. Such portrayals may contribute to the perpetuation of patriarchal discourses and gender inequality, particularly if these books are held up as examples of equality.
- Full Text:
- Date Issued: 2020
- Authors: Heydenrych, Ellen Frances
- Date: 2020
- Subjects: Book Dash (South Africa) , Picture books for children -- South Africa , Sex role in literature , Patriarchy in literature , Children's literature, South African (English) -- 21st century -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/164284 , vital:41106
- Description: In response to a demand for quality children’s picture books written and published by South Africans for local children, Book Dash – a South African non-profit organisation – has devised a publishing model in which they produce high quality children’s picture books in a twelve-hour period. Their aim is to publish books that represent a diverse range of South African children. However, while their objective is to create books that are representative of many races, this representation happens through gendered characters. In this thesis, I explore the representation of gender in Book Dash’s picture books. I use a combination of visual social semiotics, narrative theory, and critical discourse analysis, specifically focusing on the gendered ways in which the characters are represented. My analysis of these books shows how complex it can be to contest regimes of representation that work to fix patriarchal discourses and gender inequality. My findings reveal a paradox in the representation of gender norms in female characters, as some girl child characters are represented in roles that challenge gender norms, while female adult characters are consistently represented as conforming to the patriarchal feminine ideal. There is also a notable lack of father figures in these books. Such portrayals may contribute to the perpetuation of patriarchal discourses and gender inequality, particularly if these books are held up as examples of equality.
- Full Text:
- Date Issued: 2020
A novel, improved throughput bioassay for determining the delative speed of antimalarial drug action using fluorescent vitality probes
- Authors: Laming, Dustin
- Date: 2020
- Subjects: Plasmodium falciparum , Malaria -- Treatment -- Africa , Antimalarials , Malaria vaccine
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/139902 , vital:37810
- Description: Malaria is one of the most prevalent diseases in Africa and Plasmodium falciparum is widely accepted as the most virulent of the malaria parasite species, with a fatality rate of 15 – 20 % of reported cases of infection. While various treatments have been accepted into early stage clinical trials, there has been little progress towards a proven vaccine. Pending a long-term solution, endemic countries rely heavily on the development of innovative drugs that are not only efficacious but are also quick acting. Traditional methods of evaluating antimalarial killing speeds via morphological assessments are inherently flawed by tedious, subjective interpretations of the heterogenous parasite morphology encountered in routine parasite culture conditions. This has led to the introduction of alternative assay formats to determine how rapidly compounds act on parasites in vitro: a parasite reduction ratio (PRR) assay that measures the recovery of parasite cultures from drug exposure; determining the shift in IC50 values of compounds when dose-response assays are carried out for different time periods; a bioluminescence relative rate of kill (BRRoK) assay that compares the extent to which compounds reduce firefly luciferase activity in transgenic parasites. Recent whole cell in vitro screening efforts have resulted in the generation of chemically diverse compound libraries such as the Medicines for Malaria Venture’s Pathogen Box, which houses 125 novel compounds with in vitro antiplasmodial activity. Assessing the relative killing speeds of these compounds would aid prioritizing fast-acting compounds that can be exploited as starting points for further development. This study aimed to develop a bioassay using the calcein-acetoxymethyl and propidium iodide fluorescent vitality probes, which would allow the relative speed of drug action on Plasmodium falciparum malaria parasites to be assessed and ranked in relation to each other using a quantitative, improved throughput approach. Initially applied to human (HeLa) cells, the assay was used to compare the relative speeds of action of 3 potential anti-cancer compounds by fluorescence microscopy. Subsequently adapted to P. falciparum, the assay was able to rank the relative speeds of action of standard antimalarials by fluorescence microscopy and two flow cytometry formats. Application of a multiwell flow cytometer increased throughput and enabled the assessment of experimental compounds, which included a set of artemisinin analogs and 125 antimalarial compounds in the MMV Pathogen Box. The latter culminated in the identification of five rapidly parasiticidal compounds in relation to the other compounds in the library, which may act as benchmark references for future studies and form the basis of the next generation of fast acting antimalarials that could be used to combat modern, resistant malaria.
- Full Text:
- Date Issued: 2020
- Authors: Laming, Dustin
- Date: 2020
- Subjects: Plasmodium falciparum , Malaria -- Treatment -- Africa , Antimalarials , Malaria vaccine
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/139902 , vital:37810
- Description: Malaria is one of the most prevalent diseases in Africa and Plasmodium falciparum is widely accepted as the most virulent of the malaria parasite species, with a fatality rate of 15 – 20 % of reported cases of infection. While various treatments have been accepted into early stage clinical trials, there has been little progress towards a proven vaccine. Pending a long-term solution, endemic countries rely heavily on the development of innovative drugs that are not only efficacious but are also quick acting. Traditional methods of evaluating antimalarial killing speeds via morphological assessments are inherently flawed by tedious, subjective interpretations of the heterogenous parasite morphology encountered in routine parasite culture conditions. This has led to the introduction of alternative assay formats to determine how rapidly compounds act on parasites in vitro: a parasite reduction ratio (PRR) assay that measures the recovery of parasite cultures from drug exposure; determining the shift in IC50 values of compounds when dose-response assays are carried out for different time periods; a bioluminescence relative rate of kill (BRRoK) assay that compares the extent to which compounds reduce firefly luciferase activity in transgenic parasites. Recent whole cell in vitro screening efforts have resulted in the generation of chemically diverse compound libraries such as the Medicines for Malaria Venture’s Pathogen Box, which houses 125 novel compounds with in vitro antiplasmodial activity. Assessing the relative killing speeds of these compounds would aid prioritizing fast-acting compounds that can be exploited as starting points for further development. This study aimed to develop a bioassay using the calcein-acetoxymethyl and propidium iodide fluorescent vitality probes, which would allow the relative speed of drug action on Plasmodium falciparum malaria parasites to be assessed and ranked in relation to each other using a quantitative, improved throughput approach. Initially applied to human (HeLa) cells, the assay was used to compare the relative speeds of action of 3 potential anti-cancer compounds by fluorescence microscopy. Subsequently adapted to P. falciparum, the assay was able to rank the relative speeds of action of standard antimalarials by fluorescence microscopy and two flow cytometry formats. Application of a multiwell flow cytometer increased throughput and enabled the assessment of experimental compounds, which included a set of artemisinin analogs and 125 antimalarial compounds in the MMV Pathogen Box. The latter culminated in the identification of five rapidly parasiticidal compounds in relation to the other compounds in the library, which may act as benchmark references for future studies and form the basis of the next generation of fast acting antimalarials that could be used to combat modern, resistant malaria.
- Full Text:
- Date Issued: 2020
A personality-based surveillance model for Facebook apps
- Authors: Van der Schyff, Karl Izak
- Date: 2020
- Subjects: Facebook (Electronic resource) , Electronic surveillance -- Psychological aspects , Online social networks -- Psychological aspects , Social media -- Psychological aspects , Personality
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/145534 , vital:38447
- Description: The surveillance of data through the use of Facebook Apps is an ongoing and persistent problem that impacts millions of users. Nonetheless, limited research has been conducted investigating to what extent a Facebook user’s personality influences their awareness of such surveillance practices. Thus, to understand this situation better, the current study inductively developed four propositions from secondary data sources as part of a detailed content analysis. Spanning three search and analysis phases the content analysis led to the development of the research model. Guided by the propositions and research questions, a questionnaire was developed based on the relevant constructs prescribed by the Theory of Planned Behaviour. This questionnaire was used, and a total of 651 responses were collected from Facebook users over the age of 18 years old and residing in the United States of America. Primary data took place at both a univariate and multivariate level with a specific focus on the development of a structural model. Interpretation of the structural model revealed that out of all the Big Five personality traits, Conscientiousness exhibited the strongest relationship with information security awareness followed by Openness to Experience and Neuroticism, respectively. The results further indicated that the model constructs based on attitude, social norms and awareness significantly influenced the intended use of Facebook Apps. The study also contributes by indicating which personality traits are most vulnerable to Facebook App surveillance. For example, it was found that individuals high in Conscientiousness are the least vulnerable with individuals high in Extraversion being the most vulnerable. Since the results indicate that not all the personality traits are significantly related to the model constructs, additional factors may contribute to App surveillance in this context. Concerning this, factors such as user apathy, information privacy, privacy concerns, control and Facebook dependency are discussed as a means to argue why this might be the case.
- Full Text:
- Date Issued: 2020
- Authors: Van der Schyff, Karl Izak
- Date: 2020
- Subjects: Facebook (Electronic resource) , Electronic surveillance -- Psychological aspects , Online social networks -- Psychological aspects , Social media -- Psychological aspects , Personality
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/145534 , vital:38447
- Description: The surveillance of data through the use of Facebook Apps is an ongoing and persistent problem that impacts millions of users. Nonetheless, limited research has been conducted investigating to what extent a Facebook user’s personality influences their awareness of such surveillance practices. Thus, to understand this situation better, the current study inductively developed four propositions from secondary data sources as part of a detailed content analysis. Spanning three search and analysis phases the content analysis led to the development of the research model. Guided by the propositions and research questions, a questionnaire was developed based on the relevant constructs prescribed by the Theory of Planned Behaviour. This questionnaire was used, and a total of 651 responses were collected from Facebook users over the age of 18 years old and residing in the United States of America. Primary data took place at both a univariate and multivariate level with a specific focus on the development of a structural model. Interpretation of the structural model revealed that out of all the Big Five personality traits, Conscientiousness exhibited the strongest relationship with information security awareness followed by Openness to Experience and Neuroticism, respectively. The results further indicated that the model constructs based on attitude, social norms and awareness significantly influenced the intended use of Facebook Apps. The study also contributes by indicating which personality traits are most vulnerable to Facebook App surveillance. For example, it was found that individuals high in Conscientiousness are the least vulnerable with individuals high in Extraversion being the most vulnerable. Since the results indicate that not all the personality traits are significantly related to the model constructs, additional factors may contribute to App surveillance in this context. Concerning this, factors such as user apathy, information privacy, privacy concerns, control and Facebook dependency are discussed as a means to argue why this might be the case.
- Full Text:
- Date Issued: 2020
A psychobiographical case study: Amelia Dyer in a search for glory
- Authors: April, Heather
- Date: 2020
- Subjects: Serial murderers--Psychology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/50857 , vital:43008
- Description: The study is a psychobiographical case study based on the life of a Victorian baby farmer Amelia Dyer (1837-1896). She was executed for the murder of babies who were placed in her care over a period of 30 years. Psychobiography is a qualitative method of enquiry which explores the life of a unique individual subject through the lens of a psychological theory for the purpose of creating a coherent psychological case study. The psychoanalytic theoretical lens of Karen Horney was used to trace the evolution of Amelia Dyer’s sense of self within the Victorian culture of respectability. Baby farming referred to an unregulated business of adoption and fostering of infants, mostly illegitimate infants for a fee. Insufficient social structures and support for unwed mothers and children encouraged the business practice as women had very little choice for childcare. Baby farming was open to abuse and exploitation and hundreds of babies lost their lives due to insufficient care or infanticide. Amelia Dyer showed special talents and creativity from a young age, was ambitious and wanted to be self-reliant in a culture that did not provide women with opportunities to live out their ambitions. Baby farming became a business venture for her in the early stages of her life which later evolved into sadistic abuse and murder of the infants. Her evolution from a creative and hardworking young girl to a sadistic murderer of children is what qualifies her as a suitable subject for the exploration of Karen Horney’s dynamic theory of neuroses and the development of the neurotic self within culture. Extensive biographical data was collected and processed into salient themes. The study integrates the theory of Karen Horney, the life experiences of Amelia Dyer and Victorian respectability and demonstrates the value of using psychobiography as the method of inquiry into the exploration of the unique individual. The findings of the study demonstrated that Amelia Dyer and her social context were inextricably bound by a vicious cycle of psychic and emotional vi conflicts related to fear, control and self-hatred by the internalization of gender stereotypes and norms. The contribution of the study as a whole rests with its demonstration of the value of a holistic and reflexive exploration of the unique individual woman. It demonstrates the value of Horney’s in-depth theoretical understanding of the ambivalent core of selfhood that lies behind observable acts of behavior. The study as a whole contributes towards building upon holistic and integrative therapeutic frameworks in the understanding of diversity amongst women and mothers in culture.
- Full Text:
- Date Issued: 2020
- Authors: April, Heather
- Date: 2020
- Subjects: Serial murderers--Psychology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/50857 , vital:43008
- Description: The study is a psychobiographical case study based on the life of a Victorian baby farmer Amelia Dyer (1837-1896). She was executed for the murder of babies who were placed in her care over a period of 30 years. Psychobiography is a qualitative method of enquiry which explores the life of a unique individual subject through the lens of a psychological theory for the purpose of creating a coherent psychological case study. The psychoanalytic theoretical lens of Karen Horney was used to trace the evolution of Amelia Dyer’s sense of self within the Victorian culture of respectability. Baby farming referred to an unregulated business of adoption and fostering of infants, mostly illegitimate infants for a fee. Insufficient social structures and support for unwed mothers and children encouraged the business practice as women had very little choice for childcare. Baby farming was open to abuse and exploitation and hundreds of babies lost their lives due to insufficient care or infanticide. Amelia Dyer showed special talents and creativity from a young age, was ambitious and wanted to be self-reliant in a culture that did not provide women with opportunities to live out their ambitions. Baby farming became a business venture for her in the early stages of her life which later evolved into sadistic abuse and murder of the infants. Her evolution from a creative and hardworking young girl to a sadistic murderer of children is what qualifies her as a suitable subject for the exploration of Karen Horney’s dynamic theory of neuroses and the development of the neurotic self within culture. Extensive biographical data was collected and processed into salient themes. The study integrates the theory of Karen Horney, the life experiences of Amelia Dyer and Victorian respectability and demonstrates the value of using psychobiography as the method of inquiry into the exploration of the unique individual. The findings of the study demonstrated that Amelia Dyer and her social context were inextricably bound by a vicious cycle of psychic and emotional vi conflicts related to fear, control and self-hatred by the internalization of gender stereotypes and norms. The contribution of the study as a whole rests with its demonstration of the value of a holistic and reflexive exploration of the unique individual woman. It demonstrates the value of Horney’s in-depth theoretical understanding of the ambivalent core of selfhood that lies behind observable acts of behavior. The study as a whole contributes towards building upon holistic and integrative therapeutic frameworks in the understanding of diversity amongst women and mothers in culture.
- Full Text:
- Date Issued: 2020