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A model for protecting personal information using Blockchain

- Jappie, Thauriq

Authors: Jappie, Thauriq
Date: 2020
Subjects: Blockchains (Databases) , Data protection
Language: English
Type: Master (Thesis)
Identifier: http://hdl.handle.net/10210/458453 , uj:40721
Description: Abstract: Users have lost control and ownership of their personal information in Cyberspace. Personal information is scattered across many company databases in Cyberspace and introduces many security risks, as well as a central point of attack that affects any user’s accounts containing personal information. Based on the information gathered on data breaches, the purpose of the research presented within this dissertation is to explore alternative methods that can be applied in Cyberspace. This will allow for the secured ownership and control of personal information. These methods will explore the mitigation of risks to personal information and improve the security of personal information in Cyberspace. By investigating the best methods to own and control personal information, some factors needed to be considered. Personal information would need to be transferable with users or parties in an environment which provides security, integrity, transparency, control, and interaction. In this dissertation, we will develop a model that will address the abovementioned points. The model is called the “SUUS CHAIN” model. “SUUS” means to be independent [1]. The chain is taken from the Blockchain term to indicate and support the use of the Blockchain technologies in this model. To support the development of the SUUS CHAIN model, we have chosen Blockchain technology which utilizes Smart Contracts. The Blockchain technology will provide the needed environment to securely send personal information between two parties while holding the integrity of the message, providing a fully auditable trail, and allow for the development of Smart Contracts. Smart Contracts will allow us to program any rules and conditions set out between two or more parties, concerning their personal information. We would also be allowed to program an authorization mechanism for interacting with user personal information. The contribution of our SUUS CHAIN model would be to allow users to own their personal information, as well as control how personal information is handled in Cyberspace. In doing so, we will also contribute to the improvement of securely transacting and sending personal information across Cyberspace. From the information and results accumulated throughout this dissertation, we have provided a working prototype demonstration of the SUUS CHAIN model. We have proven that the problem statement can be solved, and the objectives are met. Our SUUS CHAIN prototype demonstration, as well as the literature results provided, proves the security, control, and ownership of personal information can be accomplished. , M.Sc. (Computer Science)
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The development of a dendrimer-gold nanocomposite electrochemical sensor for the detection of lead (ii) ion in water

- Mokgwadi, Jalda Kgaogelo

Authors: Mokgwadi, Jalda Kgaogelo
Date: 2019
Subjects: Nanocomposites (Materials) , Electrochemical sensors , Drinking water|xLead content , Nanoscience
Language: English
Type: Master (Thesis)
Identifier: http://hdl.handle.net/10210/401397 , uj:33543
Description: Abstract : In South Africa, industrial development and mining sustain the economy. Unfortunately, the effluents from these industries introduce heavy metal pollutants such as lead (Pb2+) into the environmental water. Pb2+ is widely recognized as one of the highly toxic and non-biodegradable metal that poses serious health problems and even death. This study presents a method of heavy metal analysis by modifying glassy carbon electrode (GCE) with gold nanoparticles (AuNPs) and generation 2 (G2) poly(propyleneimine) dendrimer (PPI) to provide a highly sensitive electrochemical sensor for the determination of Pb2+ ions in water using square wave anodic stripping voltammetry (SWASV). The co-deposition of PPI and AuNPs on the surface of GCE was confirmed by atomic force microscopy (AFM). Voltammetric probing showed that the GCE-PPI/AuNPs platform exhibited reversible electrochemistry and conductivity in [Fe(CN)6]3 −/4 – redox probe. The electroactive surface area of the bare GCE, GCE-PPI, GCE-AuNPs and GCE-PPI/AuNPs were also estimated in order to illustrate that the prepared PPI/AuNPs nanocomposite could improve the surface area and conductivity of the GCE and was found to be 8.17 mm2 for bare GCE, 10.84 mm2 for GCE-PPI, 11.03 mm2 for GCE-AuNPs and 11.13 mm2 for GCE-PPI/AuNPs. The electroactive surface area of GCE-PPI/AuNPs modified electrode increased by approximately 36.23% as compared to bare GCE, which provided an effective evidence for the superior conductivity of PPI/AuNPs as expected. The effect of different electrochemical parameters on the sensitivity of the sensor for the Pb2+ detection was also scrutinized, including supporting electrolyte (HNO3), deposition potential (-800 mV) and deposition time (150s). The sensor was applied in the detection of different standard concentrations of Pb2+, linear range of (1 ppb-100 ppb) with detection limit of 0.96 ppb. The GCE-PPI/AuNPs sensor was then applied to detect Pb2+ in tap water whose results were validated with ICP-OES. , M.Sc. (Nanoscience)
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The economic impact of the Dobsonville Shopping Centre on the quality of lives of the local community

- Moerane, K. K.

Authors: Moerane, K. K.
Date: 2019
Subjects: Economic development - South Africa - Gauteng , Shopping centers - South Africa - Gauteng
Language: English
Type: Master (Thesis)
Identifier: http://hdl.handle.net/10210/403329 , uj:33793
Description: Abstract : This research project falls within the sphere of local economic development. With worldwide spending patterns on a constant increase, there is a demand for access to goods and services. For these goods and services consumers demand that their access be convenient and comfortable; shopping centres are built to address this demand by providing a convenient and comfortable retail structure for the customer’s benefit. This research project examined the economic impact of retail structures on the quality of lives of the local community, specifically the Dobsonville community in Soweto. The Dobsonville Shopping Centre was the first mall to be built in Soweto. It is a beacon of the first signs of economic development in the democratic South Africa. The retail sector has been identified as a factor that will aid in the economic development of the Soweto region. The objective of this research project was to establish the influence of the Dobsonville Shopping Centre on the quality of lives of the community. The literature review explored social and economic factors on the local economic development level. This was done by defining local economic development in the context of the retail structures and its related theories. These were the Central Place Theory and the Lift Cycle of Retail Development Theory; these place retail developments as the starting point and potential regenerator of local economic development. A survey was conducted with 60 Dobsonville community members and secondary data from StatsSA was used to determine the economic impact of the Dobsonville Shopping Centre on their quality of life. It was not conclusive if the Dobsonville Shopping Centre had any significant economic impact on the community in the areas of household income and employment. A secondary conclusion arising from the research project was that malls make communities more attractive for investment initiatives, thus effecting the economics of an area, thereby improving the quality of lives of community members. Shopping centres influence the community members’ iv perceptions of their local environment; thus, retail developments could be catalysts for investment and local economic development within this community. , M.Com. (Local Economic Development)
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