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권오경(Oh-Kyung Kwon),홍수명(Su-Myeong Hong),최달순(Dal-soon Choi),박찬원(Chan-Won Park),송병훈(Byeong-Hun Song),류갑희(Gap-Hee Ryu),오병렬(Byung-Youl Oh) 한국농약과학회 2001 농약과학회지 Vol.5 No.4
Pesticide actual usage in fruit crop cultivation was surveyed, and usage trends of individual pesticides were evaluated to provide data for the development of indicators of environmental impact. The amount of pesticide used for fruit crops indicated the order of fungicide> insecticide> herbicide unlike the case of paddy rice, The fungicide rate of total usage was 72% in apple cultivation. Top ranking fungicides used on fruits were Mancozeb, Propineb, Thiophanate-methyl and the main insecticides were Propargite, Omethoate, Methidathion. The usuage by formulation types showed the order of WP>EC>SL>SC>SP>WG. Pesticide usage (a.i.) per hectare by different fruits was citrus 48.6㎏, apple 27.1㎏, pear 18.6㎏, persimmon 17.5㎏, peach 11.3㎏ and grape 9.2㎏. Comparison of pesticide usage (a.i.,㎏/㏊) in some fruit crops between Korea and USA indicated that more pesticides were used for citrus, pear and peach in USA than Korea while more pesticides were used in Korea than USA for apple.
Won-Il Kim(김원일),Jin-Kyoung Kim(김진경),Ji-Hyock Yoo(류지혁),Min-Kyoung Paik(백민경),Sang-Won Park(박상원),Oh-Kyung Kwon(권오경),Moo-Ki Hong(홍무기),Jay-E Yang(양재의),Jeong-Gyu Kim(김정규) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.1
휴폐광산 인근 주민에 대한 위해영향을 평가하는데 있어서 벼 품종에 따른 변이를 파악하기 위하여 농경지 토양 및 쌀의 비소, 카드뮴, 구리 및 납의 함량을 분석하였다. 중금속 오염농경지에서 조사된 잠재적인 인체노출경로로서 오염된 농경지 및 쌀을 통한 경구섭취 및 피부접촉을 통한 품종간 일일평균 인체노출량(ADD)을 산정하였다. 비발암성 위해도 평가로 노출경로별 중금속의 위험비율인 HQ 지수와 모든 노출경로를 총합한 중금속의 위험지수인 HI 값을 US-EPA D/B를 활용하였다. 벼 품종간 HI 지수는 23.6∼34.3으로 전품종에서 높은 잠재적 위해성으로 평가되었는데 DA 품종이 가장 낮은 반면 TB 품종이 가장 높은 HI 값을 보였다. 쌀 소비에따른 비소의 발암성 위해도 평가는 품종간 2.0E-03∼3.5E-03을 보여 미국 EPA에서 정한 위해성 기준인 만명중 한명 이상으로 높게 나타났다. 발암성 위해도에 대한 품종간 비교에서 DA 품종이 가장 낮은 반면 TB 품종이 가장 높은 HI 값을 보였다. 이러한 결과는 위해성 평가가 중금속 오염에 안전한 품종을 선발하는데 유용한 도구로서 활용할 수 있음을 보여준다. Heavy metal pollution may be one of the most serious challenges confront crop production and human health. Therefore, the selection of heavy metal tolerance cultivars which adapted to the contaminated fields will introduced a suitable solution for management this critical environmental risk. The objectives of this research is to assess human health risk using geochemical analyses and exposure assessment of heavy metals in rice cultivars. Risk for inhabitants in the closed mine area was comparatively assessed for As, Cd, Cu and Pb in 10 rice varieties as a major exposure pathway. The average daily dose (ADD) of each heavy metal was estimated by analyzing the exposure pathways to rice and soil. For the non-carcinogenic risk characterization, Hazard Quotient (HQ) and Hazard Index (HI) were calculated using toxicity indices provided by US-EPA IRIS. The different rice varieties revealed a wide range of HI values from 23.6 to 34.3, indicating that all rice varieties have a high potential toxic risk. The DA rice variety showed the lowest HI value while the TB rice variety the highest. The probabilities of cancer risk for As via rice consumption were varied with rice varieties ranging from 2.0E-03 to 3.5E-03 which exceeded the regulatory acceptable risk of 1 in 10,000 set by US-EPA. The DA rice variety also showed the lowest value while the TB rice variety gave the highest value. Our results indicate that risk assessment can be contribute to screen the pollution safe rice cultivars in paddy fields affected by the mining activity.
광산인근 논토양의 카드뮴 존재형태와 쌀의 카드뮴의 함량과의 관계
김원일(Won-Il Kim),박병준(Byung-Jun Park),박상원(Sang-Won Park),김진경(Jin-Kyoung Kim),권오경(Oh-Kyung Kwon),정구복(Goo-Bok Jung),이종근(Jong-Keun Lee),김정규(Jeong-Gyu Kim) 한국토양비료학회 2008 한국토양비료학회지 Vol.41 No.3
To assess the relationship between Cd fraction in paddy soils and Cd in polished rice, soils and rice were analyzed at the 3 Cd contaminated paddy fields near closed mines. Major Cd fractions of A field were organically bound (62.6%) and Fe-Mn oxide bound (25.3%) forms. In case of B field, major Cd fractions of B1 field were carbonate bound (46.3%) and Fe-Mn oxide bound (31.6%) form whereas B2 field were residual (54.3%) and carbonate bound (21.8%) form, respectively. It showed a huge difference of Cd fraction each other. 0.1M HCl extractable Cd in soil was positively correlated with Cd in rice. Specially, the ratios of 0.1M HCl extractable Cd against total Cd content in soils were 13.7%, 2.6%, and 0.45% in A, B1, and B2 fields, respectively. These ratio were largely affected with Cd uptake to rice grain. Also, exchangable, Fe-Mn oxide bound, and carbonate bound form, which are partially bioavailable Cd fraction to the plant, were positively correlated with Cd in rice while organically bound and residual form was not correlated. Multiple regression equation was developed with Rice Cd = -0.02861 + 0.07456 FR 1(exchangeable) + 0.00252 FR 2(carbonate bound) + 0.001075 FR 3(Fe Mn oxide bound) - 0.00095 FR 4(organically bound) - 0.00348 FR 5(residual) (R<SUP>2</SUP> = 0.7893***) considering Cd fraction in soils.
휜-튜브 열교환기에서 초발수 코팅의 적용이 착제상 거동에 미치는 영향
이원종(Won-Jong Lee),배경진(Kyung Jin Bae),권오경(Oh Kyung Kwon) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.3
The formation and growth of frost in refrigerating systems can cause degradation of the system’s performance. Since super-hydrophobic coating technology can delay frost growth, it has received much attention. However, only a limited number of studies have investigated effects of super-hydrophobic surfaces on frost growth. Therefore, this study investigated effects of surface characteristics on frost behavior of heat exchangers. Heat exchangers with bare, hydrophobic, and super-hydrophobic surfaces were tested. Their frost retardation capabilities were evaluated by comparing the time taken for the air flow passage to be blocked. Super-hydrophobic surfaces delayed the time by an average of 61% compared to bare surfaces. Effects of surface characteristics on heat transfer rate and pressure drop of the heat exchanger were also evaluated. Super-hydrophobic surfaces increased the average heat transfer rate by 6.73% and decreased the average pressure drop by 41.6% compared to bare surfaces. In the defrosting process, super-hydrophobic surfaces decreased the defrost energy by an average of 24.9%.