Browsing by Author "Temesgen Bekele"

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    Garlic Value Chain Analysis in Mingar Shenkora Woreda: Amhara Region, Ethiopia
    (Addis Ababa University, 2022-11-01) Temesgen Bekele; Tebarek Lika (PhD)
    Growing garlic is becoming an important economic activity and one of development strategies in many countries. Both methods of production and the menses of marketing are improving; as a result there is production boost; but, in Ethiopia, the figure is lagging behind the global standards. In MingarShenkoraWoreda, where garlic is grown as one of the most important commercial vegetables; production is becoming an extraordinary economic activity. This study objectively identified: factors affecting production, value chain actors’, actors’ relationship and their respective role, marketing channels, and the opportunities and constraints; based on descriptive type of research; qualitative and quantitative methods; primary and secondary data; thus methodologically itdeployed mixed approach. The primary data were collected from 400 sample units from a population of 1,117 households using questionnaire method; and from different stakeholders based on individual and focus group interview. The secondary data were collected from statistical abstracts from Ethiopian Statistical Service, and annual reports from MinjarShenkoraWoredaOfficeof Agriculture, and MinjarShenkoraWoreda Administration Office. Datawasdescribed and analyzed under different statistical parameters such as: mean, standard deviation, coefficient of variation, percentage, and chi-square test both manually and using SPSS. Results of the study show, production is increasing, due to high demand from the market; but productivity is declining, because of traditional farming practices, and less focus and support from the government. Moreover, results of the study also show, total production has been increasing over time, not as a result of improving productivity; but, increasing the cropping land. Thus, this research work critically recommends; focuses to modernize and transform the agricultural sector through designing and implementing new appropriate policy interventions; that encourages and benefits smallholder farmers’ in one hand, and conducting more and more research works that could bring better productivity and smooth marketing environment; on the other hand.
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    On System of Ordinary Differential Equations and the Trace-Determinant Plane
    (Addis Ababa University, 2016-08) Temesgen Bekele; Taddese Abdi
    This thesis provides an advanced analysis of systems of ordinary differential equations (ODEs) using the trace-determinant plane as a central framework. The trace-determinant plane, defined by the trace and determinant of the Jacobean matrix of a linear system, serves as a powerful geometric tool for understanding and classifying the qualitative behavior of dynamical systems. The research begins with a detailed examination of the trace-determinant plane in the context of linear systems. By exploring the relationships between the trace (sum of Eigen-values) and determinant (product of Eigen-values) of the Jacobean matrix, the thesis elucidates the various types of equilibrium points and their stability characteristics. The trace-determinant plane is shown to map regions of distinct dynamic behaviors, including nodes, saddles, spirals, and centers, offering a comprehensive classification framework. Building on this foundation, the thesis extends the analysis to nonlinear systems by employing linearization techniques. It demonstrates how the trace-determinant plane can be utilized to approximate the local dynamics around equilibrium points and provides insights into the global behavior of nonlinear systems. The impact of parameter variations on the trace-determinant plane is also investigated, revealing how bifurcations and stability changes can be visualized and interpreted. A significant contribution of this thesis is the integration of computational methods with theoretical analysis. Algorithms for plotting the trace-determinant plane and analyzing system stability are developed and applied to a range of practical examples, including control systems, ecological models, and mechanical systems. These case studies illustrate the practical utility of the trace-determinant plane in both theoretical and applied contexts.
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    The Effect of Strategic Sourcing Practice on Logistics Operational Performance the Case of Federal Democratic Republic of Ethiopia, Ministry of National Defense Logistics Main Department
    (Addis Ababa University, 2024-06) Temesgen Bekele; Kirubel Bruck (PhD)
    Strategic sourcing is rapidly expanding around the world because organizations see it as a way to achieve strategic goals, improve end user satisfaction, and provide efficient and effective services that include a comprehensive approach to lowering total costs, including quality, service, and delivery. The study sought to investigate the impact of strategic sourcing practices on the logistics operational performance of the Ethiopian national defense force logistics main department. The study followed an explanatory research design with a quantitative approach. The logistics main department's study target population was 84, and a census-sampling technique was used because the target population was small. A questionnaire was used as a key data collection instrument. Of the total respondents, 84 questionnaires were distributed, and 80 of them, representing 95.2% response rate, were collected and assessed, which was deemed adequate. The impact of strategic sourcing practice on operational performance in selected institutions was assessed using four organizational performance metrics: quality of goods/service, total cost reduction, lead-time delivery, and end-user satisfaction. The data were examined using correlation and multiple regression analysis. According to the study's findings, the selected institutions mean score for strategic sourcing practice and operational performance in four organizational performances was moderate. The strategic sourcing practice of supplier development and developing supplier relationships have a positive and significant impact on organizational operational performance. As a result, all hypotheses were examined, with the alternative hypotheses accepted. Based on these findings, the researcher recommends improving strategic sourcing methods by investing in supplier development and relationship metrics, training, quality improvement, and technology, consequently lowering costs, improving quality, and increasing strategic sourcing resilience. Key words: Strategic Sourcing, Supplier Development, Developing Supplier Relationship, Supplier Relationship Management, Operational Performance