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Non-destructive Methods to Determine Ripening Quality of Intact Muskmelon
( Tilahun,S. ),( M. H. Seo ),( H. R. Choi ),( D. S. Park ),( T. Solomon ),( C. S. Jeong ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2019 강원 농업생명환경연구 Vol.31 No.1
Muskmelons do not exhibit significant external evidence of ripening because of their hard and thick rinds, increasing the likelihood of purchasing an unripe fruit. In this study, the non-destructive estimation of fruit ripening quality of intact “Honey One” and “Earl’s Talent” muskmelon cultivars was examined. We analyzed the correlation between the major characteristics used for assessing ripening quality (firmness, total soluble solids (TSS), and titratable acidity) and stalk moisture and specific gravity. Moreover, partial least square (PLS) regression analysis was performed for the visible/near-infrared (Vis/NIR) spectroscopy data and reference samples. The correlation coefficients (r) between stalk moisture and flesh firmness were 0.88 and 0.77 for the “Earl’s Talent” and “Honey One” cultivars, respectively. In addition, the specific gravity and flesh firmness of the fruits were negatively correlated; r = -0.65 and r = -0.63 for the “Honey One” and “Earl’s Talent” cultivars, respectively. Moreover, the PLS analysis of the calibration set revealed the determination coefficients (R<sup>2</sup>) of 0.73 and 0.54 for “Earl’s Talent” and “Honey One”, respectively, for firmness vs. Vis/NIR spectral values. In addition, the PLS analysis of the prediction set showed r<sup>2</sup> = 0.51 for “Honey One” and r<sup>2</sup> = 0.50 for “Earl’s Talent”. Hence, this study highlighted the possibility of using the status of fruit stalk, specific gravity, and Vis/NIR spectra to predict the ripening quality of muskmelons. However, further studies are necessary to develop more robust non-destructive methods for the estimation of the ripening quality of intact muskmelons.
Non-destructive Methods to Determine Ripening Quality of Intact Muskmelon
Tilahun, S.,M. H. Seo,H. R. Choi,D. S. Park,T. Solomon,정천순 강원대학교 농업생명과학연구원 2019 강원 농업생명환경연구 Vol.31 No.1
Muskmelons do not exhibit significant external evidence of ripening because of their hard and thick rinds, increasing the likelihood of purchasing an unripe fruit. In this study, the non-destructive estimation of fruit ripening quality of intact “Honey One” and “Earl’s Talent” muskmelon cultivars was examined. We analyzed the correlation between the major characteristics used for assessing ripening quality (firmness, total soluble solids (TSS), and titratable acidity) and stalk moisture and specific gravity. Moreover, partial least square (PLS) regression analysis was performed for the visible/near-infrared (Vis/NIR) spectroscopy data and reference samples. The correlation coefficients (r) between stalk moisture and flesh firmness were 0.88 and 0.77 for the “Earl’s Talent” and “Honey One” cultivars, respectively. In addition, the specific gravity and flesh firmness of the fruits were negatively correlated; r = -0.65 and r = -0.63 for the “Honey One” and “Earl’s Talent” cultivars, respectively. Moreover, the PLS analysis of the calibration set revealed the determination coefficients (R2) of 0.73 and 0.54 for “Earl’s Talent” and “Honey One”, respectively, for firmness vs. Vis/NIR spectral values. In addition, the PLS analysis of the prediction set showed r2 = 0.51 for “Honey One” and r2 = 0.50 for “Earl’s Talent”. Hence, this study highlighted the possibility of using the status of fruit stalk, specific gravity, and Vis/NIR spectra to predict the ripening quality of muskmelons. However, further studies are necessary to develop more robust non-destructive methods for the estimation of the ripening quality of intact muskmelons.
Prediction of lycopene and β-carotene in tomatoes by portable chroma-meter and VIS/NIR spectra
Tilahun, Shimeles,Park, Do Su,Seo, Mu Hong,Hwang, In Geun,Kim, Seok Hyeon,Choi, Han Ryul,Jeong, Cheon Soon Elsevier 2018 Postharvest biology and technology Vol.136 No.-
<P>The aim of this study was to examine the possibility of non-destructive estimation of lycopene and beta-carotene content in intact tomato fruit. Representative tomato fruits were harvested at different maturity stages and measurement of visible/near infrared (VIS/NIR) spectra and color variables were followed by reference analysis of lycopene and beta-carotene. Models predicting lycopene and beta-carotene from color variables and VIS/NIR spectra of intact tomato were developed. Regression coefficient between color variables (a*, a*/b*, and (a*/b*) 2) and reference values of lycopene and beta-carotene content were (0.90, 0.98 and 0.52) and (0.75, 0.81 and 0.58), respectively for the prediction set. Meanwhile, after observing predictive p-values in multiple regression, best equations were developed to predict the contents of lycopene and beta-carotene from color values with regression coefficient of 0.97 and 0.85 for lycopene and beta-carotene, respectively. On the other hand, the selected partial least square (PLS) model of VIS/NIR spectra had good predictive power for lycopene and beta-carotene showing high correlation coefficient of 0.85 and 0.77, respectively, between measured and predicted samples. This study revealed that, estimation of the lycopene and beta-carotene content in tomatoes could be achieved by a portable chroma meter and VIS/NIR spectroscopy, with a possible application at field and agricultural processing centers, respectively.</P>
Tilahun Adamu Mengistie 숙명여자대학교 아시아여성연구원 2020 Asian Women Vol.36 No.4
The study investigated the challenges involved in women’s empowerment through adult education in Ethiopia, focusing specifically on the Integrated Functional Adult Education Program, employing social constructivist paradigm and qualitative case study design. Women who had graduated from the program, facilitators, and adult education experts participated in the study. Purposive sampling technique was used to select the first two women and one Integrate Functional Adult Education (IFAE) expert from the city administration. Chain sampling was used to select the remaining eleven women for interview and seven women for the focus group discussion. Two facilitators and one IFAE expert from the Sub City were selected through a comprehensive sampling technique. Data were gathered through interview, focus group discussions, and document review. The inductive approach to iterative steps was used to analyze and interpret the data. Analysis of the data shows that women learners’ economic problems, lack of political attention, weak collaboration between bodies concerned, husbands’ influence, and societal attitudes are challenges to their empowerment process.
( Tilahun S. ),( H. S. An ),( H. R. Choi ),( D. S. Park ),( J. S. Lee ),( C. S. Jeong ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2019 강원 농업생명환경연구 Vol.31 No.3
Processing-related quality parameters and total glycoalkaloid content of tubers of ‘Atlantic’ and ‘Solbong’ potato cultivars were evaluated over a 12-week storage period at 10°C and 20°C with 85-90% relative humidity in the darkness. Also, data on color, acrylamide formation, and overall sensory responses were collected after processing into chips. Our study revealed that both cultivars had high dry matter content and specific gravity and were suitable for extended storage without significant deterioration in processing quality. Nevertheless, storage temperature interactions significantly (p < 0.05) influenced the storage quality of the tubers and affected the quality of potato chips. Chips produced from ‘Solbong’ tubers stored at 10°C had a brighter color and low acrylamide formation. It was also observed that there was a progressive increase in total glycoalkaloid content in both cultivars during the storage period, particularly at 20°C. However, it did not exceed the safe upper limit for human consumption. Interestingly, the tubers of both cultivars stored at 10°C were suitable for processing without leading to high α-solanine and α -chaconine levels for 12 weeks. Besides, the acrylamide formation in both cultivars was kept low by storage at 10°C. Hence, storing tubers of ‘Atlantic’ and ‘Solbong’ under 10°C with 85-90% relative humidity in darkness could prolong the shelf life of tubers without affecting the nutritional quality during processing. Further studies on other cultivars for extended storage periods are necessary to strengthen our findings.
Tilahun Temesgen 서울대학교 경제연구소 2005 Seoul journal of economics Vol.18 No.4
This study estimates the returns to education for workers in the Ethiopian manufacturing sector, and investigates additional determinants of hourly wages other than education. It starts the analysis using the standard framework of a Mincerian earnings function focusing on individual level characteristics as determinants of wages. The standard framework (basic Human Capital Model) is then augmented by controlling for firm level characteristics that are believed to play important roles in wage determination. In the basic model, the returns to one year of schooling for an Ethiopian manufacturing worker is around 10% for both men and women in the basic model - which is relatively small compared with estimates for other developing countries. When additional variables including firm level characteristics are controlled for, the returns to education go further down to about 8% for men and 9% for women. Conditional on schooling, the basic model estimates show that each additional year of labor market experience increases hourly wages by 6.0% for men and by 7.8% for women.
Shimeles Tilahun,Han Ryul Choi,Seok Hyeon Kim,Do Su Park,Yeon Mi Lee,Tifsehit Solomon,Cheon Soon Jeong 한국원예학회 2019 원예과학기술지 Vol.37 No.2
The longer the storage period of muskmelon fruit, the more the lower part of the fruit that is incontact with the packaging box softens compared to the other parts due to the weakness of theblossom end of the fruit. This study was conducted to identify the effect of fruit weight and placementposition in the packaging box on firmness-related quality attributes of ‘Earl’s Talent’ muskmeloncultivar during its shelf life. Fruit were harvested and graded based on their weight into small(1.0-1.4 kg), medium (1.4-1.8 kg), and large (>1.8 kg). After grading, we removed the vine from thestem end and covered the stem scar with plaster to reduce water loss and avoid contamination. Fruitwere then placed in the box downward and sideways, compared to fruit with the vine attached andstem end facing upward as a control. Based on the results, the order of importance of fruit placementposition in the packaging box could be, downward > sideways > upward for large, medium, andsmall fruit, respectively. For heavier muskmelon fruit, it is recommended to place the fruit in thebox downward for storage and distribution at ambient temperature.