Browsing by Subject "Ontology"

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    Open Access
    A semantic Bayesian network for automated share evaluation on the JSE
    (2021) Drake, Rachel; Moodley, Deshendran
    Advances in information technology have presented the potential to automate investment decision making processes. This will alleviate the need for manual analysis and reduce the subjective nature of investment decision making. However, there are different investment approaches and perspectives for investing which makes acquiring and representing expert knowledge for share evaluation challenging. Current decision models often do not reflect the real investment decision making process used by the broader investment community or may not be well-grounded in established investment theory. This research investigates the efficacy of using ontologies and Bayesian networks for automating share evaluation on the JSE. The knowledge acquired from an analysis of the investment domain and the decision-making process for a value investing approach was represented in an ontology. A Bayesian network was constructed based on the concepts outlined in the ontology for automatic share evaluation. The Bayesian network allows decision makers to predict future share performance and provides an investment recommendation for a specific share. The decision model was designed, refined and evaluated through an analysis of the literature on value investing theory and consultation with expert investment professionals. The performance of the decision model was validated through back testing and measured using return and risk-adjusted return measures. The model was found to provide superior returns and risk-adjusted returns for the evaluation period from 2012 to 2018 when compared to selected benchmark indices of the JSE. The result is a concrete share evaluation model grounded in investing theory and validated by investment experts that may be employed, with small modifications, in the field of value investing to identify shares with a higher probability of positive risk-adjusted returns.
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    Open Access
    Investigating the structural and cultural conditions that reproduce coloniality and inhibit decolonisation at a private higher education institution in South Africa
    (2025) Leburu, Mosuwa Nemeya Prince; Behari-Leak, Kasturi
    This qualitative research study seeking to establish the structural and systemic inhibitors of decolonisation at a South African Private Higher Education Institution (PHEI), adopted a Critical and Social Realism theoretical framework while employing a critical discourse analytical approach. Working within an interpretive paradigm, the study gathered data through semi-structured interviews involving the PHEI lecturers whose agential association purposively placed them at vantage points to assess the structural and cultural elements that stunt the progression of transformation. The study established that the absence of institutional commitment to decolonisation informed the lecturers' peripheral influence in executing a decolonisation agenda. It was also established that the lecturers' perceptions of decolonisation did not progress beyond intellectual and academic pronouncements and as such, institutional structure and culture continue to inhibit decolonisation. That lack of depth on the part of lecturers compromised their competence to pronounce on apparent structural and racial configurations manifest in the institution. The study recommended further investigations that would triangulate the experiences of multiple stakeholders in a bid to propose a framework that would foreground decolonisation and curriculum change as a central concern.