Browsing by Author "Tesfamichael Assefa"

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    Assessment of risk management practices in power transmission projects: The case of Ethiopian Electric Power
    (Addis Ababa University, 2022-06) Tesfamichael Assefa; Tewodrose mesfine (PhD)
    In project management, Risk management is the practice of identifying, evaluating and preventing or mitigating risks to a project that have the potential to impact the desired outcome. Risk management contributes to projects’ success to a wider range and ensures potential risks can be identified, mitigated and resolved within the given time frame. Power transmission projects are projects that are undertaken under the power sector in order to achieve socio economic goal of a country. They serve as a mid-link between power generation and power distribution systems. The purpose of this paper is to assess risk management practices in power transmission projects of EEP (Ethiopian Electric Power). Online questionnaire was administered for a sample of 103 purposely selected employees working in 16 different power line transmission projects that are currently under construction and near completion. A response rate of 78.3 % was obtained. The questions covered risk management processes including risk identification, risk analysis, risk response and risk monitoring. The findings of the research showed that all of the processes are practiced at a moderate (neutral) level. Considering the high capital outlay and different risks associated with power transmission line projects, recommendations were made based on the findings showing where special attention should be given in order to enhance the risk management process. Key words: Power transmission project, risk management process
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    Vehicles Characteristics and Their Implication on Fleet Management Performance: A Case of East Africa Bottling S.C (EABSC)
    (Addius Ababa University, 2025-02) Tesfamichael Assefa; Kassu Jilacha (PhD)
    Effective fleet management is essential for organizations to enhance operational efficiency, achieve cost savings, and promote sustainability in transportation and logistics. Notably, logistics costs can account for 10% to 30% of a manufacturing firm's overall expenses, with transportation comprising about 50% of total distribution costs. This study focuses on the impact of various vehicle characteristics on fleet management performance at East Africa Bottling S.C. (EABSC), examining factors such as fleet aging, vehicle mass, fleet size, standardization, commonality, and wheelbase. Utilizing a mixed-methods approach, the research combines primary data from questionnaires with secondary data from academic and industry sources, employing quantitative analyses like regression and correlation to explore the relationships between vehicle characteristics and fleet performance. The study also develops a Capacitated Vehicle Routing Problem (CVRP) optimization framework that incorporates these vehicle characteristics to enhance fleet optimization accuracy. Findings indicate that fleet aging, fleet size, fleet standardization, and fleet commonality significantly affect overall fleet performance. On the other hand, vehicle mass affects the fleet performance moderately. Vehicle height and vehicle wheel base has low significant on the performance. The optimization results suggest that integrating vehicle characteristics into the CVRP model can improve the fleet composition to meet a delivery demand of 80 million cases while adhering to a cost target of 150 million from 164 million. Recommendations include implementing effective maintenance practices, optimizing fleet usage, and aligning fleet strategies with organizational goals. This research contributes to existing knowledge by clarifying how vehicle characteristics influence fleet management performance and emphasizing their importance in transportation and logistics system design.