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Price discovery in the cryptocurrency option market : a univariate GARCH approach

The role of policy networks in self-build housing

  • Authors: Clark, A. , Cloete, G. S.
  • Date: 20221
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/483671 , uj:43904 , Citation: Clark, A. & Cloete, G.S. 2021. The role of policy networks in self-build housing.
  • Description: Abstract: In 2009 South Africa’s enhanced People’s Housing Process (ePHP) through which self-build housing would be implemented, was introduced. This article summarises the purposes and results of a research project undertaken to determine what role good policy network practices played in the attainment of ePHP policy objectives. The Clark Policy Network model served as a heuristic device in analysing the relationship between network characteristics, the Masizakhele Project as a case study and the attainment of policy outcomes in the project. The analysis revealed that project operations exhibited many of the indicators of the characteristics contained in the Clark Policy Network model, and that the operationalised policy outcomes associated thereto were fully attained. Generalisable observations developed during the analysis allowed the researcher to propose a network theory of policy implementation, that policy networks aimed at attaining developmental objectives must incorporate strategies to both attract and retain resources within the network.
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Power system events classification using genetic algorithm based feature weighting technique for support vector machine

  • Authors: Alimi, Oyeniyi Akeem , Ouahada, Khmaies , Abu-Mahfouz, Adnan, M. , Rimwe, Suvendi
  • Date: 2022
  • Subjects: Classification , Genetic algorithm , Power system
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/495037 , uj:44966 , Citation: Alimi, O.A., Ouahada, K., Abu-Mahfouz, A. & Rimer, S. 2021. Power system events classification using genetic algorithm based feature weighting technique for support vector machine.
  • Description: Abstract: Currently, ensuring that power systems operate efficiently in stable and secure conditions has become a key challenge worldwide. Various unwanted events including injections and faults, especially within the generation and transmission domains are major causes of these instability menaces. The earlier operators can identify and accurately diagnose these unwanted events, the faster they can react and execute timely corrective measures to prevent large-scale blackouts and avoidable loss to lives and equipment. This paper presents a hybrid classification technique using support vector machine (SVM) with the evolutionary genetic algorithm (GA) model to detect and classify power system unwanted events in an accurate yet straightforward manner. In the proposed classification approach, the features of two large dimensional synchrophasor datasets are initially reduced using principal component analysis before they are weighted in their relevance and the dominant weights are heuristically identified using the genetic algorithm to boost classification results. Consequently, the weighted and dominant selected features by the GA are utilized to train the modelled linear SVM and radial basis function kernel SVM in classifying unwanted events. The performance of the proposed GA-SVM model was evaluated and compared with other models using key classification metrics. The high classification results from the proposed model validates the proposed method. The experimental results indicate that the proposed model can achieve an overall improvement in the classification rate of unwanted events in power systems and it showed that the application of the GA as the feature weighting tool offers significant improvement on classification performances.
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3D printing for sustainable low-income housing in South Africa : a case for the urban poor

8-Parameter extraction in photovoltaic cell using firefly optimization technique

A combination of remote sensing and social media data for assessing urban sprawl in morogoro, Tanzania

A competency framework for coaches working in coaching development centres

  • Authors: Slabbert, Bernice , Hoole, Crystal
  • Date: 2021
  • Subjects: Coaching , Competency frameworks , Coaching development centres
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/479143 , uj:43327 , Citation: Slabbert, B., & Hoole, C. (2021). A competency framework for coaches working in coaching development centres. SA Journal of Industrial Psychology/SA Tydskrif vir Bedryfsielkunde, 47(0), a1841. https://doi. org/10.4102/sajip.v47i0.1841 , ISSN: (Online) 2071-0763
  • Description: Abstract: Orientation: Globalisation and the new world of work has changed the labour market, resulting in highly complex, volatile and dynamic environments. Organisations are dependent on highly skilled human capital to not only survive but also thrive. Selecting and developing talent is thus becoming a business necessity. Assessment centres (ACs) and development assessment centres (DACs) have become popular tools to manage talent because of the successful outcomes it provides. In recent years, there has been a noticeable increase in the awareness of the benefits that coaching can offer in the AC environment as well as the development of coaching development centres (CDCs). However, research on CDCs is still limited. For CDCs to provide the same rigorous results as ACs and ADCs, a well-defined competency framework is needed for coaches working in a CDC. Research purpose: The aim of this study was to explore the required competencies and formulate a competency framework for coaches working in a CDC. Motivation for the study: Coaching, which is at the heart of coaching practices such as executive coaching, one-on-one coaching, team coaching and CDCs, requires a clear set of coaching competencies to ensure that it deliver its mandate to its clients: individuals, organisations and the profession. Coaches in a CDC environment work in a different context and require different competencies. A competency framework for CDC specifically is therefore needed. Research approach/design and method: Adopting a qualitative methodology, a self-completed questionnaire was administered to eight participants, followed by a semi-structured interview. Lastly, the competency framework was verified by an expert panel of five experts using the Delphi technique. Main findings: A final competency framework consisting of 25 competencies, of which 14 are considered as core competencies, was validated. Practical/managerial implications: The study contributes to the understanding of the unique behavioural demands associated with coaches operating in the context of a CDC. It provides a conceptual and practical framework of what competencies are needed to work successfully and effectively as a coach in a CDC, and ultimately enhance the effectiveness of a CDC. Contribution/value-add: Utilising this framework in practice will enable us to use candidates best suited to the role of a coach at a CDC, and will enhance the overall success of such centres.
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A conceptual framework for effective management of conflict risk within Agile software development environments

  • Authors: Tshabalala, Mothepane M. , Khoza, Lucas T.
  • Date: 2021
  • Subjects: Risk management , Conflict management , IT projects
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/488032 , uj:44448 , Citation: Tshabalala, M.M. & Khoza, L.T., 2021, ‘A conceptual framework for effective management of conflict risk within Agile software development environments’, South African Journal of Information Management 23(1), a1352. https://doi.org/10.4102/ sajim.v23i1.1352
  • Description: Abstract: Background: Whenever teams obtain together to work towards a common goal, the lingering of an inherent conflict risk is always a possibility. This applies to software development teams as well. Researchers even argue this inherent conflict existence as necessary. Agile development environment is no exception. The main purpose for adopting Agile is to improve the technology adequacy to facilitate organisation competitiveness. Agile manages the achievement of this through its advocacy for change, adaptability and constant satisfaction of market demands. This is because Agile enables organisations to create software of quality standard that allows for quicker response to the continuously changing market needs of todays’ world. Objectives: Henceforth, this article investigates this topic to develop a conceptual framework for effectively managing conflict risk in Agile teams, to improve the organisation technology adequacy. Method: This article employed quantitative methods for data collection and analysis. A structured online questionnaire was used for data collection and Statistical Package for the Social Sciences was used for data analysis. Pearson’s correlation was used to test the relationships among variables. Results: The findings show affirming results on the existence of conflict risk among Agile software development teams. The results indicate that there is a strong positive significant correlation between effective interaction, discussions and quality software application. Moreover, the findings demonstrate a strong relation between effective conflict management and achievement of set agile project goals. Conclusion: Agile allows companies to address the market requirements while still being adaptive to constant change. However, the literature identifies conflict risk as one of the hindrances to realising this purpose.
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A confluence of liminality in a rural learner transitioning to boarding school in South Africa

  • Authors: Bennett, T. , Ramsaroop, S. , Petersen, N.
  • Date: 2021
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481550 , uj:43637 , Citation: Bennett, T., Ramsaroop, S. & Petersen, N. 2021. A confluence of liminality in a rural learner transitioning to boarding school in South Africa.
  • Description: Abstract: Many rural children in South Africa are subjected to social isolation, poor quality schooling and other related challenges, which impacts their growth and development and access to post-school educational opportunities. Well-functioning boarding schools offer a solution but research in South Africa is still in its infancy. Using the theoretical frame of liminality, in a qualitative case study, the authors explore the influence of a wellfunctioning boarding school on the social and academic development of a socioeconomically disadvantaged rural male learner. Data from interviews, observations, progress reports and open-ended questionnaires were analysed using content analysis procedures and interpreted for evidence of possible shifts, tensions, and challenges. The findings confirm that while the young man benefitted both academically and socially, the confluence of liminal spaces in his transition from a rural background to boarding school, resulted in ongoing tensions that prolonged his state of liminality. We discuss the consequences for the learner and our roles as researchers and engage with the implications for this type of research for development agents both in South Africa and internationally.
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A constitutional based transformative approach to reforming the security sector in Africa’s post liberation war countries

  • Authors: Chikwanha, Annie Barbara
  • Date: 2021
  • Subjects: Constitutionalism , Security sector reform , Afrocentric
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/483333 , uj:43862 , Citation: Chikwanha, A.B. 2021. A constitutional based transformative approach to reforming the security sector in Africa’s post liberation war countries.
  • Description: Abstract: The article reviews contemporaneous security sector reform (SSR) models and proposes an Afrocentric human-security oriented alternative, a constitutional based transformative approach. The post-colonial security sector in African countries continues to struggle with converting and infusing the nationalist liberators’ underlying values into the new institutions and this has kept post-independence security provision skewed in favour of the new political elite. Post-liberation war African countries have undergone series of SSR that depicted some semblance of stability during the transition from violent liberation struggles that were mostly fought from exile, yet the possibility of intractable conflict is real. Decades after the retreat of colonialism, the national security apparatus in the region remains a source of both instability and insecurity in many countries. This proposed SSR constitutional based transformative framework is underpinned by three core concepts: participation; accountability and transparency that undergird the core of a participatory anchored security sector governance (SSG) approach. These elements are critical factors for influencing the transformation and decolonizing of the post-colonial security sector in Africa into human security focused systems.
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A critical review of standards to examine the parameters of Child-Friendly Environment (CFE) in parks and open space of planned neighborhoods : a case of Lucknow City, India

A dark green religious analysis of the life and work of Wangari Maathai (1940 - 2011)

  • Authors: Du Toit, Louisa Johanna (Hannelie)
  • Date: 2021
  • Subjects: Belonging , Dark Green Religion , Environmental crisis
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/489507 , uj:44635 , Citation: Du Toit, L.J.H. 2021. A dark green religious analysis of the life and work of Wangari Maathai (1940 - 2011).
  • Description: Abstract: Dark Green Religion (DGR), is an umbrella term formulated by Bron Taylor, to describe nature revering movements that do not fit into the category of organized religion. These movements use religious-like emotions to express their convictions and display a sincere commitment towards the environment. A central focus of DGR is a deep-felt kinship with all living organisms on Earth (arising from a Darwinian understanding that all forms of life have developed from a common ancestor), accompanied by feelings of humility coupled with a critical view of human moral superiority. This article presents a Dark Green Religious analysis of the life and work of Wangari Maathai (1940-2011). She was the first woman in East Africa to receive a doctorate, and was awarded the Nobel Peace Prize in 2004 for her work with the Green Belt Movement (GBM). In the DGR analysis, it is illustrated that the principles of belonging, interconnectedness and sacredness are revealed through Maathai’s written legacy. Evidence is also presented that she could be viewed as an example of Naturalistic Gaianism, one of the four types of DGR. In conclusion, a link between ecofeminism and DGR is proposed by highlighting the shared concepts between the two phenomena.
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A deep gated recurrent unit based model for wireless intrusion detection system

A dilemma for determination pluralism (or dualism)

  • Authors: Van der Merwe, Ragnar
  • Date: 2021
  • Subjects: Truth , Dualism , Pluralism
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481720 , uj:43658 , Citation: Van der Merwe, R. 2021. A dilemma for determination pluralism (or dualism).
  • Description: Abstract: Douglas Edwards is arguably the most prominent contemporary advocate of moderate alethic pluralism. Significantly influenced by Crispin Wright and Michael Lynch, his work on the nature of truth has become widely discussed in the topical literature. Edwards labels his version of moderate alethic pluralism determination pluralism. At first blush, determination pluralism appears philosophically promising. The position deserves thoughtful consideration, particularly because of its capacity to accommodate the scope problem. I argue, however, that upon analysis the view is better understood as a form of metaphysical dualism or what I will call meta-dualism. Furthermore, determination pluralists face a dilemma; there appears to be an instability at the core of their dualistic model. On the one horn of the dilemma, they need a clear metaphysical demarcation at the interface of their two necessary domains. On the other horn, they seem to need to a metaphysically vague boundary at the interface of their two necessary domains. Determination pluralism needs substantial revision.
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A distributed real-time control algorithm for energy storage sharing

  • Authors: Zhu, Hailing , Ouahada, Khmaies
  • Date: 2021
  • Subjects: Energy management , Lyapunov optimization , Energy storage sharing
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/495094 , uj:44971 , Citation: Zhu, H. & Ouahada, K. 2021. A distributed real-time control algorithm for energy storage sharing.
  • Description: Abstract: In this paper, energy storage sharing among a group of cooperative households with integrated renewable generations in a grid-connected microgrid in the presence of dynamic electricity pricing is studied. In such a microgrid, a group of households, who are willing to cooperatively operate a shared energy storage system (ESS) via a central coordinator, aims to minimize their long term time-averaged costs, by jointly taking into account the operational constraints of the shared energy storage, the stochastic solar energy generations and time-varying load requests from all households, as well as the fluctuating electricity prices. We formulate this energy management problem, which comprises storage management and load control, as a constrained stochastic programming problem. Based on the Lyapunov theory, a distributed real-time sharing control algorithm is proposed to provide a suboptimal solution for the constrained stochastic programming problem without requiring any system statistics. The proposed distributed real-time sharing control algorithm, in which each household independently solves a simple convex optimization problem in each time slot, can quickly adapt to the system dynamics. The performance of the proposed low-complexity sharing control algorithm is evaluated via both theoretical analysis and numerical simulations. By comparing with a greedy sharing algorithm and the distributed ESSs case, it is shown that the proposed distributed sharing control algorithm outperforms in terms of both cost saving and renewable energy generation utilization.
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A double-layer-clustering differential evolution by speciation and self-adaptive strategies for multimodal optimization

A dynamic analysis of the demand for health care in post-apartheid South Africa

  • Authors: Mhlanga, David
  • Date: 2021
  • Subjects: Demand for health , Nursing , Post-apartheid
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/488665 , uj:44526 , Citation: Mhlanga, D. A Dynamic Analysis of the Demand for Health Care in Post-Apartheid South Africa. Nurs. Rep. 2021, 11, 484–494. https:// doi.org/10.3390/nursrep11020045 , DOI: doi.org/10.3390/nursrep11020045
  • Description: Abstract: The study aimed to investigate the drivers of demand for healthcare in South Africa 26 years after democracy. The pattern healthcare demand by households in South Africa is that most households use public healthcare services particularly public clinics compared to private and traditional healthcare facilities. Using conditional probability models, the logit model to be more specific, the results revealed that households head who is unemployed, households who do not have a business, households who were not receiving pension money, had a greater probability of demand for public healthcare institutions. On the other hand, being male, being White, Indian and Coloured, being a property owner and being not a grant beneficiary, reduces the probability of demand for public healthcare facilities in South Africa. As a result, the study recommends more investment in public healthcare but more in public clinics in South Africa due to the high percentage of households using these services. Also, the government must consider investing more in the maintenance and improvement of the welfare of nurses in the country considering the huge role they play in the delivery of healthcare to the citizens.
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A fault level based system to control voltage and enhance power factor through an on-load tap changer and distributed generators

A formative approach to the evaluation of Transformative Innovation Policies

A framework for the opperationalisation of Build-to-Rent housing in Johannesburg, South Africa

  • Authors: Kambarami, Kushinga , Gumbo, Trynos , Musakwa, Walter
  • Date: 2021
  • Subjects: Housing , Build-to-rent , Public-Private Partnerships
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/483469 , uj:43879 , Citation: Kambarami, K., Gumbo, T. & Musakwa, W. 2021. A framework for the opperationalisation of Build-to-Rent housing in Johannesburg, South Africa.
  • Description: Abstract: Build-to-Rent is an emerging long-term housing asset class and alternative housing product that is gaining popularity in the Europe, North America and Australia. Build-to-Rent is a high-end, long-term residential rental product, built and operated by specialist developers for a single institutional owner. This paper uses a summative content analysis approach to identify key stakeholders out of which a framework for the adoption of Build-to- Rent for the middle-income housing market in Johannesburg, South Africa is developed. The model is based on collaborative planning and systems dynamics approaches. A literature review of existing legislative and policy documents forms the basis of a key stakeholders’ register within South Africa’s existing institutional and legislative frameworks. This is followed by the proposal of the Collaborative-Integrated Operational Framework (CIOF) which may be adopted in order to mainstream Build-to-Rent in the Johannesburg housing sector. The findings demonstrate that there exists a well-established policy environment in South Africa, amenable to the adoption of Build-to-Rent in Johannesburg. The need for a collaborative planning approach, which fosters buy-in from all spheres of government and other stakeholders within the housing sector is further reinforced through the development of this framework.
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