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이아연(Ah-Youn Lee),배태민(Tae-Min Bae),조윤섭(Youn-Sup Cho),황용수(Yong-Soo Hwang) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
Physiological characteristics of two Korean golden kiwifruit cultivars, ‘Halla Gold’ and ‘Haehyang’, were compared to determine the storage potential of fruit. The soluble solid levels of the fruit were 8.9 and 6.9 oBrix in ‘Halla Gold’ and ‘Haehyang’ at harvest, respectively but increased up to 15.4 in ‘Halla Gold’ and 17.5 oBrix in ‘Haehyang’ after 2 months of storage. Major sugars were fructose and glucose, and sucrose content was relatively low regardless of cultivar. The edible quality of ‘Haehyang’ was better than ‘Halla Gold’ because of higher amount of sugars. Firmness of the fruits gradually decreased as the increase of storage period in ‘Halla Gold’ in both flesh and core tissue. Th firmness loss of ‘Haehyang’ fruit was faster in the first 2 months and then became slow. After 75 days of storage, the firmness of ‘Haehyang’ fruit was only 5.2% at harvest. Core tissue was soften enough to eat at ripe stage. Wall modifying enzyme activities including xylanase, α-L-arabinofuranosi- dase and β-galactosidase were consistently higher in ‘Haehyang’ and the activity of pectate lyase was more increased than ‘Halla Gold’ after 2 months of storage. Respiration rate of ‘Haehyang’ was higher than ‘Halla Gold’ and further increased after 2 months of storage. Weight loss was much higher in ‘Haehyang’ which showed higher rate of the firmness loss. The storage potential of golden kiwifruit was estimated to be about 2 months for ‘Haehyang’ and 3 months for ‘Halla Gold’ when determined on the basis of the fruit firmness.
국제개발협력사업의 마을도로 건설 비용편익 분석 - KOICA 베트남 라오까이 행복프로그램 적용사례 -
이아연,공기서,윤성수,송양훈,Lee, Ah-Youn,Kong, Ki-Seo,Yoon, Seong-Soo,Song, Yang-Hoon 한국농촌계획학회 2018 농촌계획 Vol.24 No.3
The purpose of this study is to measure the cost-benefit of a road construction project in Vietnam through international development cooperation, which includes private grants and Official Development Assistance(ODA). In developing countries, it is difficult and costly to use data on markets, the CVM(Contingent Valuation Method) to measure the WTP(Willingness-to-Pay) as the benefits of road construction are used. A total of 232 villagers in 16 villages of Lao Cai Province in Northern Vietnam have been surveyed. It is found that the Benefit-Cost Ratio(B/C) in all 3 models are found to be well over 1.0, ranging from 2.8 to 3.64 with the discount rate of 0.06. These BC ratios imply the road construction project in Lao Cai can be justified. Also, it is found that the shortened travel time is the most relevant factor for WTP among direct benefits and the enhanced academic achievement of the children is the most relevant factor among indirect benefits, due to easier and faster access to schools, which in turn increase the school attendance rate. The result of this study can be used to justify other similar projects in Vietnam, even though the benefits may have to be reassessed in other countries.
수확 후 고농도 CO<sub>2</sub> 단기처리가 '매향' 딸기의 저장에 미치는 영향
안선은,왕무화,이아연,황용수,Ahn, Sun-Eun,Wang, Mao-Hua,Lee, Ah-Youn,Hwang, Yong-Soo 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.1
This experiment was conducted to examine the effects of a short-term treatment of high pressure $CO_2$ on shelf-life of strawberry fruit. A short-term treatment (12 hr) of 100% $CO_2$ resulted in the increase of fruit firmness up to 71.9% compared to that at harvest. The firmness of $CO_2$ treated fruit remained a significantly higher than that of control (air) up to 15 days. The alteration of pectic polymers was observed by $CO_2$ treatment such as an increase of EDTA soluble pectins and decrease of water soluble ones. The $CO_2$ treatment resulted in the increase of total amount of wall bound calcium. Pectate lyase activity, an important agent of strawberry fruit softening, was also significantly reduced by $CO_2$ treatment. Contents of soluble solids and acids of $CO_2$ treated fruit were higher than those of control fruit. Short-term treatment of high pressure $CO_2$ affected shelf-life through firmness increase whereas the visual quality and decay incidence of strawberry fruit were not affected.
수확 전후 칼슘-키토산 및 고농도 CO₂ 단기처리에 의한 ‘설향’ 딸기 과실의 저장성 증진
안선은(Sun-Eun Ahn),이아연(Ah-Youn Lee),왕무화(Mao-Hua Wang),황용수(Yong-Soo Hwang) 한국원예학회 2014 원예과학기술지 Vol.32 No.5
수확 전후 키토산 및 CO₂ 단기처리가 ‘설향’ 딸기 과실의 저장성과 품질에 미치는 영향을 조사하기 위하여 본 실험을 수행하였다. 과실 경도는 수확 시기가 늦어질수록 감소하였고 수확 전 칼슘-키토산 누적 처리는 수확 당시의 과실 경도를 유의하게 증가시키지 못하였다. 그러나 수확 전 키토산 처리와 수확 후 100% CO₂ 단기처리를 병행하였을 때 저장중 경도 유지와 과피 무름 및 부패를 억제하였다. 수확 전키토산 살포는 과실의 무름 장해 및 부패 발생 억제에 효과적이나 수확 시기가 늦어질수록 칼슘-키토산의 수확 전 처리 효과가 감소하였다. 결론적으로 수확 전 칼슘-키토산과 수확 후 CO₂의 병행 처리는 딸기 과실의 경도 증가는 물론 과피 색의 변화 및 부패를 억제시키므로 딸기의 저장성 증진을 위한 수확 후 처리기술로 유용하였다. This experiment examined the effects of preharvest Ca-chitosan spraying and short-term post-harvest treatment with high pCO₂ on the shelf-life of ‘Seolhyang’ strawberry fruit. Fruit firmness decreased when harvested late in the season and was little affected by Ca-chitosan spray treatments. Short-term treatment with high pCO₂ after harvest, however, significantly increased fruit firmness regardless of preharvest treatment. The combined treatment of Ca-chitosan spray and high pCO₂ led to an additional increase in shelf-life through delay of skin disorder, fruit decay incidence and firmness loss during simulated marketing. The residual effects of both treatments, however, were reduced when fruit were harvested late in the season. Fruit firmness was more affected by high pCO₂ treatment whereas decay and visual quality were affected by preharvest spraying with Ca-chitosan. Although more research is required to determine the optimum concentration of calcium and chitosan, and the optimal spray interval, our results show that the combined treatment of preharvest Ca-chitosan spray and postharvest high pCO₂ is effective in improving strawberry fruit shelf-life by increasing firmness and delaying decay.