Journal Articles

Permanent URI for this collectionhttp://localhost:4000/handle/20.500.12504/86

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Development and evaluation of a sustainable solar cooker for operations in Uganda
(African Journal of Emerging Issues, 2025-01-27) Steven, Sebunya; AlMas Sendegeya; Maureen Nalubowa Ssempijja
Purpose of the Study: The research focused on developing and evaluating a solar cooker as a sustainable energy solution to address the cooking needs in Africa, using Uganda as a case study. Statement of the Problem: While solar energy technologies have the potential to enhance energy sustainability and reduce greenhouse gas emissions, current solar cookers face limitations in addressing local cooking habits, energy demands, and geographical conditions in Uganda. Methodology: The research established energy requirements for cooking based on common food types, average household size, and average solar irradiation in Uganda. A solar box cooker was designed and modeled using SOLIDWORKS software. Material selection and cost analysis were conducted for economic feasibility, and the optical and thermal performance was analyzed using COMSOL Multi-Physics software. A prototype was constructed using locally available materials to assess manufacturability and cost implications. Results: A box-type solar cooker was developed with inner reflector walls at an optimal angle and internal insulation for better heat retention and efficiency. The cooker, with an aperture area of 0.1897 m², meets the thermal requirements for cooking common foods in major regions of Uganda. All materials used are locally available, making the cooker appropriate, sustainable, and affordable. Conclusion: The proposed solar cooker offers a viable alternative to traditional cooking methods in Uganda. It effectively cooks common foods, is cost-effective, and provides environmental benefits, reducing reliance on charcoal.
Efficient recovery of linear predicted coefficients based on adaptive steepest descent algorithm in signal compression for end-to-end communications
(Journal of Electrical and Computer Engineering, 2025-01) Abel, Kamagara; Abbas Kagudde; Baris Atakan
The efficiency of recovery and signal decoding efficacy at the receiver in end-to-end communications using linearly predicted coefficients are susceptible to errors, especially for highly compressed signals. In this paper, we propose a method to efficiently recover linearly predicted coefficients for high signal compression for end-to-end communications. Herein, the steepest descent algorithm is applied at the receiver to decode the affected linear predicted coefficients. Tis algorithm is used to estimate the unknown frequency, time, and phase. Subsequently, the algorithm facilitates down-conversion, time and carrier recovery, equalization, and correlation processes. To evaluate the feasibility of the proposed method, parameters such as multipath interference, additive white Gaussian noise, timing, and phase noise are modeled as channel errors in signal compression using the software-defined receiver. Our results show substantial recovery efficiency with noise variance between 0 and y × 10E − 3, where y lies between 0 and 10 using the modeled performance metrics of bit error rate, symbol error rate, and mean square error. This is promising for modeling software-defined networks using highly compressed signals in end-to-end communications.
Performance analysis of a hybrid of solar photovoltaic, genset, and hydro of a rural-based power mini-grid: case study of kisiizi hydro power mini-grid, Uganda
(MDPI- Processes, 2023-01) Richard, Cartland; Al-Mas, Sendegeya; Jean de Dieu, Khan Hakizimana
The power sector in Uganda has increased steadily, focusing majorly on rural electrification to increase the proportion of the rural population accessing electricity using grid extension and isolated mini-grid approaches. Hydropower mini-grids implemented in rural communities have issues regarding system failures leading to shutdowns and load shedding. A study on an existing isolated hydropower mini-grid was made to find the possible causes. A review of published articles and reports, and an analysis of enrollment patterns, energy sales, and load demand was carried out. A field survey with a guided questionnaire to collect information about real energy demand data was carried out. The performance of the system was accomplished through simulation using HOMER pro × 64 software. The findings from the study show a reduction in customer enrollment, a reduction in energy sales, and a reasonable number of system shutdowns. Hybridization of the existing hydropower was modeled with different options. The hybrid system proposed indicates that, when implemented, it would reduce fuel consumption from 222 to 23.2 L/day and emissions from 82.5 to 8.3 kg/year on average and increases system reliability. Simulated values of NPC, LCOE, and operating costs are appreciable. Despite mini-grid shortfalls, there is notably improved livelihood due to improved social and economic services.
Training model on electrical safety and energy conservation to socially-backward region school students
(IEEE, 2023-04) Bwanika, Gerald Mayanja; Rhodah, B.; E., Namugeni; Y., Dhanalakshmi; T., Tom Priya Darshini; B., Koti Reddy
As the saying goes for knife, ‘‘It is a good servant, but a bad master the same holds good for electricity. It can brighten our lives and at the same can char one’s future if not handled properly. Electricity is very useful for human beings right from the first day of its invention. Also, with the rapid growth of industrialization, there is a need to conserve the natural resources such as sunlight, wind or water and at the same time electrical energy due to the rising demand of the luxuries. The awareness about the electrical safety and energy conservation should be started from school-going children onwards, any habit nurtured in the small age can bring one into a good being. This work has developed a basic training model to teach the school students. The basic definition of certain electrical terminologies is mentioned. The hazards related to electrical, the ways to avoid or rectify them are also discussed. Also, the fundamental principles of electrical safety which are to be followed while dealing with any Electrical equipment are included. The concept of energy conservation and the basic ideas of supplying power through renewable resources as well as the need for sustainable development are included in this work.
Identification and punishment policies for spectrum sensing data falsification attackers using delivery-based assessment
(IEEE Transactions on Vehicular Technology ., 2015-11) Althunibat, Saud; Birabwa, Joanitah D.; Granelli, Fabrizio
Spectrum sensing data falsification (SSDF) attacks represent a major challenge for cooperative spectrum sensing (CSS) in cognitive radio (CR) networks. In an SSDF attack, a malicious user or many malicious users send false sensing results to the fusion center (FC) to mislead the global decision about spectrum occupancy. Thus, an SSDF attack degrades the achievable detection accuracy, throughput, and energy efficiency of CR networks (CRNs). In this paper, a novel attacker-identification algorithm is proposed that is able to skillfully detect attackers and reject their reported results. Moreover, we provide a novel attacker-punishment algorithm that aims at punishing attackers by lowering their individual energy efficiency, motivating them either to quit sending false results or leave the network. Both algorithms are based on a novel assessment strategy of the sensing performance of each user. The proposed strategy is called delivery-based assessment, which relies on the delivery of the transmitted data to evaluate the made global decision and the individual reports. Mathematical analysis and simulation results show promising performance of both algorithms compared with previous works, particularly when then the number of attackers is very large.

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