• 농약과학회지
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• 제14권3호
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• pp.255-260
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• 2010

유기농법과 관행농법을 실시하고 있는 배추와 고추 포장에서 두 농법간의 곤충상을 비교 하였다. 유기농 배추밭에서는 총 9개목의 62종의 곤충이 채집되었으며 관행농법 지역에서는 총 6개 목 24종이 채집되었다. 고추밭의 경우도 유기농법 지역에서 곤충들이 많이 채집 되었다. 우점도 지수, 다양도 지수, 종 풍부도와 균등도 모두 유기농법지역이 높은 것으로 나타났다.

• 한국유기농업학회:학술대회논문집
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• 한국유기농학회 2009년도 하반기 학술대회
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• pp.284-284
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• 2009

EFA production systems have through necessity resulted in the development of innovative practices for weed, pest and diseases control, for example, using ducks and snails for weed control in paddy fields. These practices began to be introduced in the early 1990's and the techniques have become more popular and have been adapted to suit regional conditions. In this study, the production practices, productivity and economic performances of organic and non-chemical rice farming adopting ducks and snails for weed control were compared. In the production practices, Korean organic and non-chemical farming seem to have several concerns in terms of sustainability. It comprises lack of resistant variety use and rotational cropping system as well as high dependency upon external inputs such as organic fertilizer and farming materials for pest control. The production level of organic farming is approximately similar level but 20% higher income than non-chemical farming, while, when it was compared with conventional farming organic farming showed 20% lower productivity but 20% higher income. Organic farming shows 15% to 18% higher profits than non-chemical farming as the snail-using organic farming tends to have higher income and lower input costs than duck-using organic farming. This may encourage more farmers to convert to organic production using these techniques than simply non-chemical farming in the future. This organic conversion could be more promoted by policy intervention. However, it may result in increased supply and therefore decreased prices for organic rice in the long term unless further market demand occurs. Balanced policy measures considering production as well as marketing and consumption are urgently required for the sustainable development of organic farming.

• 한국유기농업학회지
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• 제18권2호
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• pp.257-269
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• 2010

본 실험은 질소안정동위원소존재비($\delta^{15}N$)를 이용하여 유기벼와 일반벼의 판별 가능성을 탐색하기 위하여 실시하였다. 시료는 전국에 걸처 유기벼 17점, 그리고 유기벼 재배 인근지역에서 일반벼 13점을 수집하여 2008년 11월부터 2010년 1월까지 설문 및 분석 작업을 수행하였다. 벼는 벼와 현미, 백미, 왕겨로 도정한 다음 이들의 질소 및 질소안정동위원소 자연존재비($\delta^{15}N$)를 분석하였다. 이 성분이 두 그룹의 간의 판별에 이용될 수 있을지를 검증하기 위하여 판별분석을 적용, 그 결과를 요약하면 다음과 같다. 1. 유기벼 농가가 사용한 질소원은 퇴비, 쌀겨, 균배양체, 버섯배지, 유박이었고 사용량은 농가에 따라 큰 차이가 있었고, 볏짚은 모두 논에 환원하였다. 그러나 일반벼 농가는 복합비료를 쓰고 볏짚은 회수하여 판매한 경우가 많았다. 2. 유기벼의 벼와 현미, 백미, 왕겨의 중질소자연존재비의 차이가 가장 컸으나 통계적 유의성은 없었고 지역간의 차이도 유의성이 없었다. 일반벼에서도 유기벼와 같은 경향이었다. 3. 유기벼와 일반벼의 질소안정동위원소존재비는 유의한 차이가 있었고(p<0.01) 이러한 차이는 유기 및 비유기 왕겨에서도 나타났다(p<0.05). $\delta^{15}N$값은 유기벼 및 비유기벼 판별의 지표로 유용한 것으로 사료된다. 4. 판별분석 SPSS와 Logistic을 적용하였을 때 현미와 백미를 제외하고 모두 유의한 차이가 있었다. 판별에는 왕겨가 가장 유용하였고, 미지시료의 83.3%가 바르게 분류될 수 있는 것으로 나타났다. SPSS방법은 벼와 왕겨, Logistic 방법은 네 가지 구성성분 모두 유의하게 나타났으나 그 중 검정값이 가장 높게 나타난 것은 왕겨로 83.3%가 바르게 분류될 수 있음이 확인되었다.

• 한국응용과학기술학회지
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• 제20권1호
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• pp.64-71
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• 2003

Squid ink was added to the low salt fermented squid by 4% of concentration and ripened at 10$^{\cric}C$ for 6 weeks and at 20$^{\cric}C$ for 28 days. The effect of the squid ink on the non-volatile organic acids of low salt fermented squid were investigated. The results are as follows; The non-volatile organic acid in the salt fermented squid without addition of the squid ink was examined and the result showed that lactic and acetic acids were the major organic acids even if very small amount of citric and oxalic acids were detected. In the squid ink added to the low salt fermented squid, total quantity of non-volatile organic acid in the latter part of the ripening was lower than no treatment groups.

• Tribology and Lubricants
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• 제13권3호
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• pp.10-19
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• 1997

Frictional characteristics of two different types of automotive friction materials were studied. They were non-asbestos organic and semi-metallic friction materials. The two friction materials were tested using an inertial brake dynamometer to investigate friction stability, rooster tailing phenomena, temperature change during drags and stops. Results show that the level of the friction force is strong functions of time, temperature, and speed regardless of the type of friction materials. In particular, rooster tailing effects are pronounced in the case of semi-metallic friction materials compared to non-asbestos organic friction materials. The phenomena appear strongly dependent on raw materials contained in the friction materials.

• 청정기술
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• 제22권3호
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• pp.203-207
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• 2016

Here, we report a novel fabrication technique for patchable organic lasing sheet based on non-volatile liquid organic semiconductors and freestanding polymeric film with high flexibility and patchability. For this work, we have fabricated the second-order DFB grating structure, which leads to surface emission, embedded in the freestanding polymeric film. Using an ultra-violet (UV) curable polyurethaneacrylate (PUA) mixture, the periodic DFB grating structure can be easily prepared on the freestanding polymeric film via a simple UV curing process. Due to unsaturated acrylate remained in the PUA mixture after UV curing, the freestanding PUA film provides adhesive properties, which enable mounting of the patchable organic lasing sheet onto non-flat surfaces with conformal contact. To achieve laser actions in the freestanding resonator structure, a composite material of liquid 9-(2-ethylhexyl)carbazole (EHCz) and organic laser dyes was used as the laser medium. Since the degraded active materials can be easily refreshed by a simple injection of the liquid composite, such a non-volatile liquid organic semiconducting medium has degradation-free and recyclable characteristics in addition to other strong advantages including tunable optoelectronic responses, solvent-free processing, and ultimate mechanical flexibility and uniformity. Lasing properties of the patchable organic lasing sheet were also investigated after mounting onto non-flat surfaces, showing a mechanical tunability of laser emission under variable surface curvature. It is anticipated that these results will be applied to the development of various patchable optoelectronic applications for light-emitting displays, sensors and data communications.

• 한국물환경학회지
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• 제34권5호
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• pp.487-493
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• 2018

Urban stormwater runoff is the one of the most extensive causes of deterioration of water quality in streams in urban areas. Especially, in the Suyeong River watershed, non-point sources from urban-residential areas are the most common cause of water pollution. Also, it has been ascertained that BOD and COD as indexes of organic matter, have limitation on management of Suyeong River's water quality. In this study, changes of organic matter properties of Suyeong River from inflow of non-point source during rainfall were investigated. Fractions of organic matters were analyzed using water samples collected at two sites (Suyeong River and Oncheon Stream) during a rain event. Variations of dissolved organic carbon (DOC) concentration by rainfall were similar to flow rate change in the river. Distribution of organic matter fraction according to change of rain duration revealed that while hydrophilic component increased at initial rainfall, the hydrophobic component was similar to change in dissolved organic carbon (DOC) concentration. Also, the relative proportion of hydrophilic components in organic matter in river water increased, due to rainfall. Results of biodegradation of organic matters revealed that decomposition rate of organic matters during rainfall was higher than that of during a non-rainfall event.

• 한국유기농업학회지
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• 제19권spc호
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• pp.74-77
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• 2011

The production practices, productivity and economic performance of organic and non-chemical rice farming were compared in Jeonnam Province, Korea. Korean organic rice farming showed a lack of use of resistant varieties and rotational cropping systems as well as less use of farm wastes and a high dependency upon external inputs. When compared with no-chemical rice production practices very little differences were found. However, organic rice farming showed 15% to 18% higher profits than no-chemical farming even though the productivity was arguably similar between the two farming types. This may encourage more farmers to convert to organic production rather than non-chemical farming as the farming practices are very similar, thereby resulting in increased supply of organic products and decreased prices for organic rice near future. There is a need to more greatly differentiate organic farming practices and products from those of no-chemical farming.

• 폴리머
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• 제34권2호
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• pp.89-96
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• 2010

Methyl methacrylate(MMA), ethyl acrylate(EA), n-butyl acrylate(BA), styrene(St) 단량체를 수용성 개시제인 ammonium persulfate(APS)와 음이온 유화제인 sodium dodecyl benzene sulfonate(SDBS)를 사용하여 organic/organic core-shell 구조의 접착바인더를 중합 후 부직포와 피혁에 함침시키고 플라즈마 표면 처리 후 속도론적인 해석과 기계적인 물성을 평가하였다. Core-shell 바인더 중합시 전환율은 단량체의 조성이 등몰에서 MMA/EA, MMA/BA core-shell 복합입자 모두 90% 이상이 되었다. 등몰에서 부직포/부직포에 core-shell 복합입자를 함침시키고 플라즈마 처리 후의 상태접착 박리강도는 MMA/St, EA/BA, BA/MMA, EA/St, EA/MMA의 순으로 되었고, 또한 부직포/피혁에 core-shell 복합입자를 함침시키고 플라즈마 처리 후의 상태접착 박리강도는 MMA/BA, BA/EA, MMA/EA, St/MMA, EA/St의 순으로 되었다.

• 한국유기농업학회지
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• 제10권1호
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• pp.49-63
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• 2002

In order to supply 85% of total organic feed in ruminants and 80% in non-ruminants for organic animal production, nitrogen fixation ability of legume should be used in domestic roughages production. 50% of Europe organic farmer use intercropping legume in as green manure. This article is dealing with amount of biologically fixed nitrogen used by legumes and methods for estimating the transfer of biologically fixed N in rotation and separating the N benefit into fixed N and non-fixed N components are reviewed. Available data indicate that transfer amount of N to non legumes was from 50∼9.6(kg/ha) in legume-cereal rotations and proportion of legume N varied with seasons, 90% in summer, 50% in autumn. The important point in cropping system for legumes have to be included for organic forage production 6 year rotation is based on pasture system of 3 year pasture + 2 year annual(com, sudangrass), again pasture. Rye, barly and Italian ryegrass+legumes(vetch, crimson and pea) can be one of option in spring, com, soybean, sudangrass and Japanese bamyard millet would be seeded after spring harvest in the field. Farmer can make good use of rice paddy field as forge production potential area after harvesting rice. Italian, burly and rye+vetch and crimsonclover may be grown in autumn or spring time at the rice field.