Browsing by Author "Tigist, Abebe"

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    The Effects of Components of Employees’ Attitude on Effectiveness of Performance Appraisal System: The Case of Commercial Bank of Ethiopia
    (A.A.U., 2020-05) Tigist, Abebe; Ethiopia Legesse, Segaro (Phd)
    The notion of Performance Appraisal System (PAS) and the attitude of employees towards it have stayed center of study in the science of management discipline over the last two-three decades. As the success of institutions largely depend on its human resource, closely assessing the issue will have a paramount importance to the institutions. Commercial Bank of Ethiopia (CBE), the biggest bank in Ethiopia is practicing performance appraisal using information communication system. However, no study so far have considered to study the effect of employees‟ attitude towards the effectiveness of performance appraisal system comprehensively. The effect of components of employees‟ attitude towards the effectiveness of performance appraisal system of CBE, specifically of those who are working the head office organs of the bank, and what determines the employees‟ attitude towards the performance appraisal system is worth studying. Therefore this research paper has mainly focused on assessing the effect of components of employees‟ attitude towards the effectiveness of performance appraisal practice of the bank by specifically considering the business processes in the head office organs of the bank. Explanatory research design and quantitative research approach was applied to achieve this overriding objective of explaining the effect of component variables of the attitude of employees of the bank towards the effectiveness of PAS. A multiple regression analysis was applied on the data collected from the selected sample using strartified sampling technique. Finally the data was collected using questionnaires, cleaned, coded in to and analysed using SPSS V20. As per the findings of the study motivation of employees was found to highly affect the overall effectiveness of PAS and most of its dimensions. In addition organizational commitment of employees also have a positive and significant effect on the effectiveness of PAS in the bank. The third variable, job satisfaction has a positive effect on the dimensions of PAS but statistically the effect is insignificant. Hence, it was concluded, as per employees who are working in the head office organs of the bank that among the components of employees‟ attitude the motivation of employees was the best predictor of effectiveness of PAS. Therefore, the top management of the bank should strongly work on maintaining employees‟ atitiude positive and at high level through enhancing employees‟ motivation, their commitment and job satisfaction, as well.
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    Production of Antioxidant Rich Glucose Syrup from Ensete Ventricosum Starch through Enzymatic Hydrolysis and Preservation using Green Tea Extract
    (Addis Ababa University, 2021-10) Tigist, Abebe; Shimeles, Shumi (PhD)
    Ensete ventricosum is a plant native to Ethiopia with a high content of starch. This study aimed to produce antioxidant rich glucose syrup from enset starch by using alpha amylase and glucoamylase enzymes and preservatives using green tea polyphenols. The starch was isolated from the corm and pseudostem parts of Enset plant and characterized. The main process steps for enzymatic production of glucose syrup from enset starch were: gelatinization, liquefaction, saccharification, centrifugation followed by treatment with activated charcoal and evaporation to final solids ( >70%). The preservative effect of green tea extract on the shelf life of the syrup was also examined for 30days, by studying its effect on pH, moisture content and viscosity of the glucose syrup. Samples were treated with 0, 100, 200, and 300ppm of green tea polyphenols. The study showed that the moisture content, ash content, crude fat content, protein content, and amylose content of enset starch were: 8.98%, 0.15%, 0.38%, 0.1%, and 29.01%, respectively. Response Surface Methodology Design (RSMD), particularly, Box Behnken Design (BBD) was applied to investigate the effect of temperature (50, 60 and 70℃), time (12, 24 and 36hr), and glucoamylase concentration (0.1, 0.15 and 0.2wt.%), on the process of saccharification using Design expert® 12 software, which shows the significant influence on the value of dextrose equivalent (DE). The maximum concentration of glucose (95.64%) in terms of DE was found at the parameter interaction of 0.1wt.% (glucoamylase concentration), 60℃, and 36hr. The result showed that the optimum condition for the saccharification process was 62℃, 12hr and 0.2wt.% (glucoamylase dosage) which resulted in 91.79±0.5% of DE. The moisture content, total soluble solid, ash content, density, specific gravity, viscosity and pH of the product were: 24.01%, 75.32°Brix, 0.35%, 1380.8 kg/m3, 1.3833, 940 mPa.s, and 5.5, respectively. Generally, it was observed that green tea extracts with a concentration of 100ppm of TPC was found to be suitable as preservative to keep the quality and extend the shelf-life of glucose syrup at room temperature. Hence, Enset starch is a promised raw material to develop glucose syrup enriched with extracts of green tea to elevate its shelf life.