Department of Computer Engineering
Permanent URI for this collectionhttp://197.255.125.131:4000/handle/123456789/23125
Browse
5 results
Search Results
Item Maximum Power Point Tracking in Power System Control Using Reservoir Computing(Frontiers in Energy Research, 2022) Seddoh, M.A.; Sowah, R.A.; Sackey, D.M.; et al.This article deals with an innovative approach to maximum power point tracking (MPPT) in power systems using the reservoir computing (RC) technique. Even though extensive studies have been conducted on MPPT to improve solar PV systems efficiency, there is still considerable room for improvement. The methodology consisted in modeling and programming with MATLAB software, the reservoir computing paradigm, which is a form of recurrent neural network. The performances of the RC algorithm was compared to two well-known methods of maximum power point tracking: perturbed and observed (P&O) and artificial neural networks (ANN). Power, voltage, current, and temperature characteristics were assessed, plotted, and compared. It was established that the RC-MPPT provided better performances than P&O-MPPT and ANN-MPPT from the perspective of training and testing MSE, rapid convergence, and accuracy of tracking. These findings suggest the need for rapid implementation of the proposed RC-MPPT algorithm on microcontroller chips for their widespread use and adoption globallyItem Vulnerability Analysis of Online Banking Sites to Cross-Site Scripting and Request Forgery Attacks: A Case Study in East Africa(IEEE 8th International Conference on Adaptive Science and Technology, 2021) Buah, G.; Memusi, S.; Sowah, R.A.; et al.Web applications are prone to several attacks. Two common threats are cross-site scripting attacks and cross site request forgery. With internet banking becoming more popular in East Africa, the level of security that online banking services offer has become an increasing concern. This paper presents an analysis of the safety of these applications used by many unsuspecting customers seeking convenience and determines ways to detect and prevent these attacks from taking place. We assumed that if people with a technical background in IT and information security are vulnerable to CSRF and XSS attacks, the public would be even more vulnerable. Out of 96 users, 35 answered our survey, 53.1% of the respondents said they do not check the URLs of online banking websites they visit to ensure they are not on a phishing site. Secondly, only 36.4% of users considered the security implications of clicking on links in emails or even on banking websites all the time. Based on the interviews done, testing and analysis conducted, there is a clear indication that Internet banking users are vulnerable to XSS and CSRF. Notably, close to 50 % of the Internet banking users we interviewed reported that they do not receive ample tips from the banks regarding security issues to look out for when transacting online. The findings from this research help make recommendations to banks and users to ensure that future online banking transactions are done more securely.Item : Public Wi-Fi Set-Up to Complement Existing Campus Internet Access Provided by the University of Ghana(Newswood Limited, 2023) Aboagye, I.A.; Boadu, E.O.; Wiafe, O-B.; et al.Public Wi-Fi can be found in public places such as airports, coffee shops, University campuses, etc. The ease with which people can access the internet using public Wi-Fi is comparatively the preferred internet access technology and provides comfort to many of its users. The major issues that characterize the public Wi-Fi networks at the University of Ghana especially the School of Engineering Sciences are slow internet speeds, low bandwidth, and weak Wi-Fi signals. Wi-Fi accessibility during peak hours for serious academic work has always been a problem. There is therefore the need to provide improved wireless communication technology with improved internet speeds, higher bandwidths, and stronger signals to complement the Wi-Fi services provided by the University of Ghana. To achieve this, a Wi-Fi network was implemented to provide an alternative to the existing campus Wi-Fi. This was done using fiber optics backhaul, two Altai super Wi-Fi access points (antennas), and a Mikrotik 8 port router. The results showed a significant improvement in performance as compared to the Wi-Fi services provided by the University in terms of strength, signal bandwidth, upload, and download speeds respectively. This will help students and lecturers at the University to conduct their research work smoothly without any disruptions. © 2023 Newswood Limited. All rights reserved.Item Optimal sizing and techno-economic analysis of a hybrid solar PV/wind/diesel generator system(IOP Conference Series: Earth and Environmental Science, 2022) Tay, G.; Acakpovi, A.; Adjei, P.; Aggrey, G.K.; Sowah, R.; et al.Abstract. Hybrid power systems that combine wind and solar PV technology have been widely employed for power generation, particularly for electrification in remote and islanding locations, because they are more cost-effective and reliable than traditional power systems. This article intends to develop an environmentally friendly and cost-effective hybrid power system for selected critical loads in the Avuto community of Ghana. Following the acquisition of site data, a hybrid solar PV, wind, diesel generator, and converter analysis was conducted using HOMER software to establish the appropriate sizing of system components based on technical and economic parameters such as load served, annual electricity production, net present cost (NPC), emission, Operating cost, Fuel consumption and energy cost (COE). Based on the optimization computational results, it can be stated that the combination of system components, including solar photovoltaic, wind turbine, and diesel generator, is a good fit for the application region and might be used for rural and island electrification in the future. The suggested energy system has an LCOE of 0.39 US$/kWh for the 1.08 US$/litre diesel fuel cost and a 3.33-year payback period, with 58.8 kW for PV, 7 units for 3 kW wind turbines, 10 kW for diesel generator, and 6.99 kW for the converter. In terms of emission reduction, the proposed case presented a 55% emission reduction from the base case scenario.Item Innovative design of grid connected solar/diesel hybrid system using RETScreen software(IOP Conference Series: Earth and Environmental Science, 2022) Kof, D.; Acakpovi, A.; Adjei, P.; Sowah, R.; Aggrey, G.K.; et al.Abstract. Accessibility to dependable energy resource is vital to the emerging economy to function appropriately in this contemporary world for both residential and commercial purposes. Technological advancement has opened avenues for more sophisticated technologies to combine multiple energy sources to generate affordable electricity for residential and industrial purposes. The study, therefore aims at analyzing the fiscal benefits of hybrid Solar PV and Diesel Generator (DG) (PV-DG) grid-connected system using RETSceen software. The study focused on a specific location, J. A. Plant Pool Ghana Limited, warehouse Department. The study recommended and proposed an effective design of a hybrid PV-DG grid connected electricity supply for the warehouse Department. The economic viability of the project and the payback period obtained through computation were very attractive. Also, the total revenue of electricity exported to the grid annually and GHG emission reduction were within the standard benchmark. The study finally concurred that renewable energy sources such as solar when hybridized with any other energy systems, lead to a noticeable electrical cost reduction. Therefore, this system design provides multiple benefits, including; improved reliability, reduced emission and significant cost reduction.