About Addis Ababa University Institutional Repository (AAU-ETD)

AAU-ETD is an electronic open access institutional repository of Addis Ababa University that makes available and digitally preserves the scholarly outputs produced at AAU. The repository contains both published and unpublished work including: theses and dissertations,preprint,staff and student publications.

Services provided by AAU Library repository specialist:

  • Create Colleges/Institutes and collections
  • Provide depositing services
  • Train and facilitate community members to add materials
  • Review and add additional descriptive information (metadata) to each record.
  • Maintain open access and ensure preservation of materials
  • Maintain the software and hardware required for continuous service
  • Research copyright and seek permissions

All faculty are invited to submit their research to the AAU-ETD which is operated and maintained by Addis Ababa University Library. For further information please contact us at ________

 

Recent Submissions

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An Evaluation of the writing tasks in the Grade Twelve English Textbook
(Addis Ababa University, 2023-06) Wegayehu Gebeyehu; Dr. Hailom Banteyirga
The main goal of this study was to evaluate and analyze the design accuracy of writing tasks in grade 12 English textbook and checking its alignment with the teacher’s guide and syllabus in the light of the current theories of communicative tasks by using Nuna’s (1989) framework; how well the writing tasks are structured and organized to be able to promote writing skills. Based on the fundamental elements of communicative tasks and the evaluation checklist for communicative tasks proposed by Nunan (1989), the writing tasks were selected and examined. The researcher employed a descriptive research design that combined qualitative and quantitative methods in order to accomplish this goal. The researcher used questionnaires, focus groups, and content analysis (Textbook analysis) for randomly chosen 50 students, and 3 teachers with access to census/available sampling technique. The study's finding showed that the majority of writing tasks fall short of many of the necessary requirements included in the checklist that allow students to express themselves in writing. The results also showed that while the objectives of the writing exercises are described clearly for students and teachers in the textbook. However, a few of the criteria for good objectives are not met by the majority of objectives and there is a lack of variation. Similar to this, the inputs are known to the students and meet their requirements and interests, but because there aren't enough suitable authentic resources and they aren't implemented properly, they don't offer enough information. Similar to this, the textbook's activities satisfy the requirements of being meaningful, purposeful and real-wordiness. However, they lack the use of pair and group work, motivational values, and authenticity; and they are severely constrained in their ability to include stages of tasks and topics that require advanced thought. Furthermore, the textbook, teacher's guide, and syllabus clearly define the role of the students and the teachers, delegating to the latter the roles of guiding, facilitating, and counseling while leaving the students with the full task. However, in a few exercises, the teacher's roles are not made explicit. Additionally, there is integration between writing tasks and other skills well more than half percent but the integrative tasks for each of the skill are not equally and fairly distributed and still, it needs more things to include in the writing task integration design. The alignment of the textbook with the syllabus as well as the teachers' guide has encountered issues. There are restrictions on how the textbook and syllabus align, as well as the teachers' guide. The lack of alignment in the two materials' communicative task components is evident when they are compared to the textbook. Finally, even though they don't greatly encourage the use of pair or group work, the activity settings are variable rather than predetermined. As a result, it is advised that textbook authors take into account the five fundamental elements of communicative tasks (goals, inputs, activities, roles, and setting), integration when designing tasks for course materials and keep the alignments of tasks design between students’ textbook with teachers’ guide and syllabus.
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Adaptive Radial Basis Function Neural Network Based Hierarchical Sliding Mode Controller for 2-Dimensional Double Pendulum Overhead Crane
(Addis Ababa University, 2024-01) Wosene Yirga; Dereje Shiferaw (PhD)
Several control methods for an overhead crane modeled as a double pendulum with constant cable length have been published in various studies. Most of the proposed control methods were open-loop and linear control methods or nonlinear control methods that fully depended on the system model.However, the dynamic of an overhead crane is a complex nonlinear function of uncertain or unknown parameters, which reduces the performance of such control methods. In this thesis, an adaptive radial basis function neural network-based hierarchical sliding mode controller (ARBFNNHSMC) is designed to control a 2-dimensional overhead modeled as a double pendulum system with variable cable length using the Lagrange equation of motion. To reduce the chattering effect of the sliding mode controller as well as increase its robustness, ARBFNN is designed to estimate unknown or uncertain nonlinear functions in the system. The overall control law, which contains only some parts of the crane model, is designed, and the adaptation law is derived from the Lyapunov stability condition to update the weight of the network based on observed errors. The proposed control strategy and derived model are verified using MATLAB/Simulink software.For the same controller parameters,500% changes in model parameters are taken, and trolley displacement settling time and rising time for HSMC are 12.3 seconds and 6.95 seconds, respectively. On the other hand, the maximum hook’s and payload’s swing angles are around 1.34 deg and 1.9 deg for HSMC, and it is around 1.04 deg and 1.64 deg for ARBFNN-HSMC. The residual hook’s and payload’s swing angles are 0.0137 deg and -0.0319 deg, respectively, in the case of HSMC and -0.0011 deg and -0.0022 deg for ARBFNN-HSMC. This numerical result shows that ARBFNN-HSMC has better performance than HSMC for large parameter variations. In addition, the controller output of ARBFNN-HSMC is smoother than that of HSMC, as evidenced by the result.
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Building Height and Layout analysis for Improved Residential Quarters; the Case of Some Selected Condominium Building Sites of Kolfe Keraniyo Sub-City, Addis Ababa
(Addis Ababab University, 2024-03-01) Habtamu Wesebo Lire; Asfaw Mohamed (PhD)
This thesis investigates mainly the current housing problems in Addis Ababa, which are getting worse and need an urgent solution. Currently, there are about 950,000 people waiting for the 10/90, 20/80, and 40/60 condominium house schemes. The existing condominiums are built with limited consideration of available space and a low building height without accounting for proper building location, i.e., slope, noise, wind, weather, and sunlight. There are also limited communal parking spaces, green spaces, and recreational areas, and there are cases where those spaces are used for other purposes and are not used by the community. Methodologically, the height regulation building prepared by the Addis Ababa city administration used questionnaires and checklists to collect data. The findings show that there is a lack of building height and layout for regulations condominiums, variations in the standard and existing conditions, a lack of building setbacks, and the condition of buildings contradicting the nearby villages. So, the condominiums that are going to be built at the government level to overcome housing problems require a system that needs to be controlled and completely meet standards. Key words; condominiums, community, building height, building layout, regulations…
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Magnitude and associated factors of Intraventricular Hemorrhage among preterm neonates admitted to neonatal intensive care unit of Addis Ababa public hospitals in, Ethiopia, 2023 cross sectional study.
(Addis Ababa University, 2023) Alemu, Mihret; Sebsibie, Girum(PhD); ,Berhan, Yeshiwork
Background: Intraventricular hemorrhage is one of the most severe brain injuries in preterm neonates, especially in VLBW and ELBW, and is associated with some perinatal risk factors, such as antepartum hemorrhage, urogenital tract infections, chorioamnionitis, and some neonatal risks, such as mechanical ventilation, continuous positive airway pressure, intubation, asphyxia, respiratory distress, sepsis, and thrombosis. Objective: To assess the magnitude of Intraventricular hemorrhage and associated factors among preterm neonates admitted to the neonatal intensive care unit of public hospitals in Addis Ababa in 2023.Method: An institution- based cross-sectional study was carried out. The final sample size was 381 preterm neonates admitted to selected public hospitals in Addis Ababa from February 27 to March 27, 2023. The study was conducted in five randomly selected public hospitals in Addis Ababa. Data was collected using a pretested data extraction tool (Kobo) chart reviewed by the data collector. The collected data was exported to SPSS version 26 for analysis. Descriptive statistics to describe the variables were conducted for bi-variable logistic regression and multi-variable logistic regression analysis. Variables with a P-value < 0.05 in the multivariate analysis (final model) were considered significantly associated. The tables, figures, and graphs were used to present the findings. Result: The magnitude of Intraventricular hemorrhage was reported in 93 (25%), with 37.6% of patients having grade II, which was the most frequent, followed by severe grade III (24.7%), grade IV (20.4%), and grade I (17.2%), which was the least prevalent. Our study found that very low birth weight (AOR: 7.45; 95% CI: 2.12, 26.21), hypothermia (AOR: 2.53, 95% CI: 1.36, 4.47), Thrombocytopenia (4.03, 95% CI: 1.73, 9.40), and blood transfusion (AOR: 2.85; 95% CI: 1.18, 6.90) were independent factors for Intraventricular hemorrhage. Conclusion and recommendation: The magnitudes of Intraventricular hemorrhage were low compared to reports of other studies in Africa and globally, while the severity of Intraventricular hemorrhage was relatively high. Therefore, a further large-scale study with the same title is required to understand factors associated with Intraventricular hemorrhage among preterm neonates.
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Moral distress and associated factors among nurses in West Arsi zone public hospitals, south-east Ethiopia, 2023
(Addis Ababa University, 2023) Desalegn,Lemma; Gela, Debela(Ass. Prof.); Boka, Abdisa(Ass. Prof.)
Background: Healthcare personnel, particularly nurses, are at a significant risk of developing and experiencing moral distress globally. African nurses' moral suffering has not been the subject of many research. Existing publications mostly focused on qualitative studies. Furthermore, data on the prevalence and associated variables of moral distress among Ethiopian nurses and across all working units in public hospitals is scarce. Objective: The aim of this study was to assess the level and associated factors of moral distress among nurses working in the West Arsi zone, south-east Ethiopia, in 2023. Methods: An institutional-based cross-sectional study was carried out from February 13 to March 2, 2023. A total of 349 study participants were selected by a simple random sampling method. Data was collected using a structured self-administered questionnaire, entered into EpiData 3.1, and exported to SPSS V.26 statistical software for further analysis. Descriptive statistics and logistic regression analysis were performed. Then, finally, statistical significance was determined using a p value < 0.05 and 95% CI. Results: A total of 349 participants were enrolled in this study, with a response rate of 98.5%. The mean (SD) age of the participants was 39.2 ± 7.0. Among all of the participants, 194 (55.6%) were female. The majority of the nurses, 293 (84.0%), hold a bachelor's degree in the nursing profession. The mean year of experience was 7.7 ± 6.9. The proportion of high moral distress among nurses was 73.1%. Being female nurse [AOR: 0.457, 95% CI (0.283, 0.740)], job dissatisfaction [AOR=7.67, 95% CI: 3.075, 19.121], and unfavourable working environment [AOR=4.069, 95% CI: 1.915, 8.648] were significantly associated with high level of moral distress. Conclusion and recommendation: According to this study, the proportion of nurses experiencing moral distress was high. Female nurses, job dissatisfaction, and unfavourable working environment were shows significant association with high level of moral distress. More qualitative research is needed to identify the fundamental cause of the problem and its relationship to female nurses, job dissatisfaction, and unfavourable working environment.