Browsing by Author "Kassahun Yimer (PhD)"

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    Bussing Machine Improvement of 20MW/Year Solar Panel Production Line: A case study of Ethiopian Power Engineering Industry (Sandafa)
    (Addis Ababa University, 2022-09) Samrawit Temesgen; Kassahun Yimer (PhD)
    Ethiopia has plenty of sunshine months compared to the developed world and other African countries by recording 80% of solar energy potential. However, currently the one and only renewable energy industry is the “Ethiopian Power Engineering Industry” that stopped the production of the PV panels, due to lack of management skills and economic problems to be competitive on the PV market in assembling the solar cell in the industry continuously. On this research, knowledge based technical solutions given to the management and the supervisor of the industry, while the industry has faced a technical problem on the solar cell connecting machine/bussing machine which means the machine has stopped connecting the solar cells. Data collected from the internet, site survey and questionnaire in order to analyze the problems. Based on the data collected this paper presents innovative solutions with three solar cell connecting technology for the technical problem of the bussing/solar cell connecting machine of the 20MW/year PV panel production line in the industry. By comparing these innovative solar cell connecting technologies for the bussing machines simulation run with the software Griddler 2.5 for the bus bars variations the I-V characteristics, power output and the Fill Factor effect of the solar cells simulated. However, currently the industry is using the 2 Bus Bars (2BB) technology produced by the bussing machine but from the output of the software smart wire solar cell connecting technology is preferable. A recommendation was made for the industry economically to apply the smart wire solar cell connecting technology and it is recommended that to do more researches on this technology.
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    Customer-Oriented Product Development: A Case Study at Yirgalem Addis Textile Factory Plc.
    (Addis Ababa University, 2017-03) Yonas Habtu; Kassahun Yimer (PhD)
    The success of a product or service largely depends on how they meet the customers' needs and expectations. This thesis work employs Quality Function Deployment methodology to translate customer needs and requirements into the quality characteristics to improve quality for an existing product and to develop a new consumer product. Quality Function Deployment is a management tool that provides a visual connective process to help teams focus on the needs of the customers throughout the total development cycle of a product or process. It provides the means for translating customer needs into appropriate technical requirements for each stage of a product/process‐development life‐cycle. It helps to develop more customer‐oriented, higherquality products. The study was conducted in a case company called Yirgalem Addis Textile. The study used focus group discussion and questionnaire to identify customer needs of Yirgalem Addis Textile product of men’s t-shirt and based on the result of the survey, fifteen customer needs and product technical requirement were identified. In order to identify the most prominent customer needs and product technical requirement, the data were analyzed using Quality Function Deployment approach and Pareto chart. It was revealed in the study that Yirgalem Addis Textile failed in terms of meeting the needs of customers of men’s t-shirts and so as to alleviate those problems, the study recommends to use Quality Function Deployment as a means to meet customers’ need and facilitate means of communications between each department of the company.