ResearchSpace

Communities in ResearchSpace

Welcome to ResearchSpace, the institutional repository of the CSIR. ResearchSpace is an open access electronic archive collecting, preserving and distributing scholarly digital materials created by the CSIR.

Recent Submissions

Item

Overcoming challenges for improved patient-centric care: A scoping review of platform ecosystems in healthcare

(2024-01) Chibuike, MC; Grobbelaar, SS; Botha, Adele

In recent studies, platform ecosystems, an extension of business ecosystems, have emerged as highly disruptive mechanisms for generating value within various industries. The transformative influence of digital technologies on conventional business landscapes is increasingly evident, facilitating inclusive and sustainable development. However, realizing value co-creation within digital platform ecosystems faces formidable hurdles in healthcare, primarily attributed to the complex challenges surrounding privacy, security, and effective data governance. Following the Joanna Briggs Institute Guidelines for scoping reviews, the study explores the extent literature on the integration of digital platform ecosystems in healthcare. The contribution of this article is to explore the applications of platform ecosystems in healthcare delivery, specifically focusing on electronic healthcare records, smartphones, artificial intelligence, big data, the Internet of Things, and blockchain technologies. The research identifies and discusses the challenges of implementing these technologies in the healthcare industry. Furthermore, the study proposes a healthcare platform ecosystem framework, integrating communication strategies, GDPR compliance, and architectural components. This study synthesizes the extant literature to formulate a theoretical healthcare ecosystem framework for improved patient-centric care. The review and resultant framework is intended to support understanding of digital health dynamics and guides healthcare organizations, technology developers, and policymakers in ensuring data security, compliance and interoperability.

Item

Material characteristics of Ti-6AL-4V samples additively manufactured using laser-based direct energy deposition

(2023-02) Willemse, MG; Siyasiya, CW; Marais, D; Venter, AM; Arthur, Nana KK

Although additive manufacturing is fast gaining traction in the industrial world as a reputable manufacturing technique to complement traditional mechanical machining, it still has problems such as porosity and residual stresses in components that give rise to cracking, distortion, and delamination, which are important issues to resolve in structural load-bearing applications. This research project focused on the characterization of the evolution of residual stresses in Ti-6Al-4V extra-low interstitial (ELI) additive-manufactured test samples. Four square thin-walled tubular samples were deposited on the same baseplate, using the direct energy deposition laser printing process, to different build heights. The residual stresses were analysed in the as-printed condition by the neutron diffraction technique and correlated to qualitative predictions obtained using the ANSYS software suite. Good qualitative agreement between the stress measurements and predictions were observed. Both approaches revealed the existence of large tensile stresses along the laser track direction at the sections that were built last, i.e., centre of the top layers of the samples. This in addition leads to large tensile stresses at the outer edges (corners) which would have the effect of separating the samples from the baseplate should the stresses exceed the yield strength of the material. Such extreme conditions did not occur in this study, but the stresses did lead to significant distortion of the baseplate. In general, the microstructures and spatial elemental mapping revealed a strong correlation between the macro-segregation of elemental V and the distribution of the ß-phase in the printed parts.

Item

Comparative analysis of hydrodynamic flowrate sources as drivers of water quality models for nitrogenous compounds in complex ungauged South African rivers

(2024-04) Mahlathi, Christopher D; Brink, I; Wilms, JM

Water quality modelling is a critical tool for managing the health of river ecosystems, particularly in regions impacted by point source pollution activities. This study investigates the influence of different hydrodynamic data sources on the performance of two river water quality models, the Basic Model (BM) and the Water Quality Analysis Simulation Programme (WASP) for modelling nitrogenous compounds in a complex river system including wastewater treatment plant effluent discharges. Four diverse hydrodynamic data input types were considered. These included measured station data, altered station data, rainfall-generated flow, and the WRSM/Pitman model estimate. Findings revealed trends, analysis of variance (ANOVA), and t-test analyses consistently demonstrated significant disparities between model predictions and measured data in specific river segments, indicating a need for segment-specific modelling approaches. An increase in Root Mean Square Error (RMSE) and Mean Square Error (MSE) values in certain segments pointed to a decline in model accuracy when confronted with distinct hydrodynamic conditions. Additionally, application of four diverse hydrodynamic data input sources yielded similar performance for BM and WASP against measured data. The research findings indicated a complex interplay between river hydrodynamics and water quality modelling, resulting in a recommendation for tailored modelling strategies that account for unique characteristics of river segments.

Item

On the zero-trust intranet certification problem

(2024-03) Badenhorst, Danielle P; Barbour, Graham D; McDonald, André M; Gertenbach, Wian P; Buckinjohn, Ethan

Securing corporate networks and ensuring the trustworthiness of network resources are critical security concerns for organisations in today's interconnected digital landscape. The zero-trust security model is an approach to designing and implementing ICT systems which prescribes that clients and servers cannot be trusted automatically, even when connected to networks traditionally considered trusted. The implementation of the zero-trust model within the corporate intranet requires a secure method to verify the identity of local servers. On the Internet, trust in the identity of public servers is established by well-known public Certificate Authorities (CAs), which issue digital certificates to securely identify servers. However, local intranet servers exist within the internal address space of the network. Consequently, it is impossible to naturally obtain digital certificates for these servers, validly signed by a public CA, without publicly disclosing sensitive information such as intranet server Domain Name System (DNS) records. This leaves organisations with the option of relying on endpoint management systems to install custom CA root certificates on all corporatre browsers or, in some cases, ignoring the problem altogether. In this paper, we draw on practical experience in the deployment of cybersecurity devices in corporate intranets to formally define the intranet certification problem. We specify five requirements that a solution to this problem must satisfy. We then conduct a comprehensive review of existing candidate solutions and academic research relevant to the intranet certification problem. Specifically, existing ICT systems for public key infrastructure and endpoint management are identified and evaluated with respect to their ability to meet the stated requirements for solving the intranet certification problem, as well as their cost. Our study reveals that solutions that meet the technical and security requirements of the intranet certification problem are beyond the reach of smaller private sector companies and public sector organisations in underdeveloped and emerging economies. The high cost and technical expertise required for their implementation and management render these solutions impractical. Consequently, by relying on servers with self-signed certificates, these entities inadvertently leave their servers susceptible to impersonation, information theft, and unauthorised resource access, thus violating the fundamental principles of the zero-trust model. We conclude that a gap exists for a simple, cost-effective, and easily managed solution to the intranet certification problem.

Item

A review on waste wood reinforced polymer composites and their processing for construction materials

(2023-05) Khoaele, Katleho K; Gbadeyan, OJ; Chunilall, Viren; Sithole, B

The necessity to utilise environmentally friendly resources has emerged due to environmental management. With the demand for the production of plastics and wood materials, pollution has increased. Consequently, the attraction in natural fibre-reinforced polymer composites (NFPCs) is rapidly emerging in the construction industry, mainly to replace synthetic fibre composites. The intensified interest is associated with manufacturing ‘green’ and lightweight panels. This review provides insight into the prospects and challenges related to the processing of wood waste-reinforced polymer composites. Using natural fibres, especially waste as raw material, is desirable for developing value-added products to mitigate environmental pollution. The current materials used for the wood-based composites are reviewed as disadvantages associated with wood plastic composites, such as low interfacial bonding. Efforts such as chemical treatment are outlined to wood fibres to manufacture an environmentally friendly, cost-effective, lightweight, and biodegradable composite with enhanced structural properties was provided. Various waste plastics, plant dust, and coupling agents-based composites investigated for applications, and emerging aspects of wood plastic composite for construction materials applications are outlined.