• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 하계학술발표대회
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• pp.98-98
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• 2005

• 한국환경농학회지
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• 제14권3호
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• pp.338-344
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• 1995

현미중 카드뮴의 분석을 위한 보다 효율적인 방법을 찾기 위해 현미중 카드뮴의 공정시험방법을 표준으로 수종의 습식 및 건식방법에 대해 카드뮴의 회수율, 표준편차 및 표준방법과의 상관성등을 비교, 검토한 결과 현미 시료량 50g, 회화온도 $600^{\circ}C$의 건식방법은 회수율이 79.6%로 표준분석방법(87.2%)을 제외한 타 분석방법보다 높고, 표준편차도 평균${\pm}2.6$으로 표준분석방법의 평균+6.4 보다 약간 작았으며, 표준분석방법으로 분석된 카드뮴함량과의 상관성($r=0.977^{\ast\ast}$)도 크게 높아 본 방법은 습식으로 분해하는 현행 수질오염 공정시험 방법과 함께 현미중 카드뮴 분석방법으로 사용하여도 좋을 것으로 판단된다.

• The Korean Journal of Ecology
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• 제20권1호
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• pp.35-41
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• 1997

Effects of cadmium on growth and nitrogen fixation activity of Melilotus suaveolens, a biennial legume plant dominating in the area of poor soil were quantitatively analyzed during the growing period. Cadmium treatments of 10, 30 and 100 ppm resulted in 12, 22 and 35% inhibition of plant height and 14, 25 nd 26% reduction of chlorophyll contents of leaves, respectively. The plant biomass reduced 51, 70 and 89% for leaves, 33, 50 and 59% for stems, and 42, 52 and 70% for roots, respectively by 10, 30 and 100 ppm Cd treatments. Cadmium contents of roots treated with 10, 30 and 100 ppm Cd were 62, 112 and 183 folds higher than that of the control, respectively. Cadmium contents of stems were about 1/2.2 of those of roots, but leaves contained only 1/27.8 of those of roots. Cadmium treatments resulted in increase of T/R ratios and decrease of F/C ratios significantly in the later growth period. Nodule formation was reduced to 8% in 42 days by the treatment of 100 ppm Cd. Specific nitrogen fixation activity of nodules attained 61.0, 24.0, 1.6 and 0.7 mol $C_2H_4{\cdot}g$ fr wt $nodule^{-1}{\cdot}h^{-1}$ on 42nd day, respectively for 0, 10. 30 and 100 ppm of Cd treatments. Total amount of nitrogen fixation per plant reduced by 73, 98 and 99% with the treatments of 10, 30 and 100 ppm Cd.

• The Korean Journal of Ecology
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• 제13권3호
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• pp.165-172
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• 1990

The contents of Pb and Cd in litters of Ginko biloba collected from thirty-four areas in Seoul were measured and analyzed for among relative air pollutions. S contents in litters of G. biloba were 0.88% at Hyehwadong, 0.98% at Yongsan and 0.95% at Ch angdong. Mean value were 0.65% in 0-10 km areas from Kwanghwamun, but were 0.47% in 10-15 km areas. In S contents, the correlation between 0-5 km area and 10-15 km area from Kwanghwamun was high significant, but correlation between 0-5 km area and 5-10 km area from Kwanghwamun had no significance. Pb contents were 118.95 ppm at Pildong, 112.22 ppm at Ulchiro 3-ga and 105.55 ppm at Bus terminal (Banpo). In Pb contents the correlation between 0-5 km area and 10-15 km aea from kwanghwamun was high significant, but the correlation between 0-5 km area and 5-10 km area from Kwanghwamun had no significance. In Cd contents. Cd contents were high in Youido, Shinch on, Kongdokdong, Haengdangdong, Kirum, Ch ongnyangni and Imundong.

• 대한화장품학회:학술대회논문집
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• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book I
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• pp.98-141
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• 2003

Lip chapping is a serious cosmetics problem, though remedies other than moisturizing have not been proposed. We investigated changes in the surface configurations of lip corneocytes and increased CD activity and improved chapping severity. Our results suggest that lip chapping can be activities of desquamation-regulating proteinases associated with lip chapping. Using scanning electron microscopy, villus-like projections were observed on the inner surfaces of most corneocytes from normal lips, whereas those with flatter surface were predominant in chapped lips. Further, cell surface area increased with the severity of lip chapping. Cathepsin D (CD)-like and chymotrypsin-like proteinase, which are also present in skin as desquamation-regulating proteinases, were detected in lip corneocytes, though only CD activity was found to decrease in severely chapped lips. Hydration was also lower in areas of lip chapping. Sequential topical application of apricot extract essence characterized as similar to senile xerosis rather than dry skin such as winter xerosis, as it shows a delayed transition of corneocytes through the stratum corneum, and the reduced CD activity may be one of the mechanisms that is further decreased by low hydration. We propose that an enhancement of both CD activity and lip moisture may be effective to improve lip chapping.

• Asian-Australasian Journal of Animal Sciences
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• 제18권6호
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• pp.835-840
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• 2005

The main objective of the present study was to determine the effect of dietary $\beta$-cyclodextrin ($\beta$-CD) on egg laying performance and cholesterol content of egg yolk. Feed intake, egg production and egg weight varied slightly, but not significantly, between hens fed either a control diet or a diet containing one of an increasing series of $\beta$-CD concentrations (2%, 4% or 6%). However, feed intake, egg production and egg weight were all lower in the hens fed on 8% $\beta$-CD (p<0.05). No difference in haugh unit values, egg yolk color and egg shell thickness were found between the different treatments. The cholesterol content of egg yolks (mg/g yolk) was significantly decreased by 0.71, 2.98, 4.00 and 4.24 mg in eggs from hens maintained on 2%, 4%, 6% and 8% $\beta$-CD, respectively (p<0.05). These observations indicate that appropriate supplementation of diets with $\beta$-CD can reduce the cholesterol content of eggyolks, thus raising the prospect of the production of a healthier functional food.

• 생태와환경
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• 제53권1호
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• pp.91-101
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• 2020

본 연구에서는 특별관리해역인 시화호 유역의 산업단지 하천에 강우 시 비점오염의 형태로 유입되는 중금속의 유출 특성 파악 및 오염원 파악을 하천 토구를 통해 배출되는 강우유출수 내 용존 및 입자성 중금속(Cr, Co, Ni, Cu, Zn, As, Cd, Pb)을 조사하였다. 용존성 Co와 Ni은 강우 초반에 고농도로 유출된 후 시간에 따라 감소하는 결과를 보였으나, 대부분의 원소는 조사시기별 강우량 및 유량 변화에 따라 각각 다른 특징을 보였다. 입자성 중금속의 경우, 시간에 따른 부유물질의 농도 변화와 유사한 경향을 보였다. 강우유출수 내 존재하는 중금속 중 Co, Ni, Zn는 용존 상태로 유출되는 비율이 높았고, Cr, Cu, Pb은 입자상 유출 비율이 상대적으로 높았다. 입자 상태로 유출되는 중금속의 인위적 오염도를 평가하기 위해 농집지수를 계산한 결과, Cu, Zn, Cd은 very highly polluted에 해당하는 심각한 오염수준으로 나타났다. 연구지역인 3간선수로 유역 인근의 도로먼지 중 125 ㎛ 이하에서의 중금속 농도와 비교한 결과, 강우유출수 내 Cu, Zn, Cd의 중금속이 금속제조관련 시설에서 절삭 혹은 가공 중에 발생하여 산업시설 표면에 축적되어 있는 금속물질이 강우유출수와 함께 수환경으로 유출된 것을 알 수 있었다. 강우유출수 내 총중금속 평균 유출부하량은 1회 강우 시 Cr 128 g, Co 12.35 g, Ni 98.5 g, Cu 607.5 g, Zn 8,429.5 g, As 6.95 g, Cd 3.7 g, Pb 251.75 g으로 금속제조와 관련된 산업시설이 주로 존재하는 유역의 특성을 잘 반영한 것으로 판단된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제9권4호
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• pp.8-14
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• 2004

카드뮴과 크롬으로 오염된 토양에 EDTA 와 붕산 혼합용출제를 주입하는 토양수세법(Soil flushing)을 적용 시 최적운전조건을 결정하기 위해서 여러 가지 반응조건에서 카드뮴과 크롬의 제거효율을 측정하였다. 카드뮴의 제거효율은 EDTA 농도가 0.001M에서 0.1M로 증가하면서 $73.2\%$에서 $98.5\%$로 $25.3\%$증가하였으며, 크롬의 제거효율은 붕산의 농도가 0.001M에서 0.1M로 증가하면서 $59.2\%$에서 $100\%$로 $40.8\%$가 증가하였다. 서로 다른 특성을 갖고 있는 카드뮴과 크롬 오염토양에 pH가 3,5,7로 조정된 0.005M EDTA 와 0.005M 붕산 혼합용출제를 주입하여 제거효율을 측정한 결과 카드뮴의 제거효율은 pH가 3에서 7로 증가함에 따라 $92.4\%$에서 $80.9\%$로 감소하였으며, 크롬의 제거효율은 pH 5에서 $70.4\%$로 가장 높았다. pH 5에서 EDTA&붕산 혼합용출제의 농도비를 변화시키면서 카드뮴의 제거효율을 측정한 결과 [EDTA]:[붕산]=0.01M:0.1M에서 가장 효율적이며, 크롬의 제거효율은 [붕산] 주입농도가 0.1M이상일 때 가장 효율적인 것으로 조사되었다. 광산지역과 산업지역에서 채취한 실제오염토양에 적용한 실험에서도 비슷한 결과를 얻었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.1132-1133
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• 2015

In this paper, we are presents production and operation characteristics for inorganic EL phosphors device using screen printed. The EL device is composed as ITO PET / EL phosphors dielectric $(2{\times}2cm^2)/TiO^2$ paste/Ag electrode. At 100Vac 400Hz, the luminescence of inorganic EL phosphors were $60.33cd/m^2$ of red phosphor, $42.12cd/m^2$ of green phosphor and $58.45cd/m^2$ of blue phosphor. The output current was 12.57 mA, 17.11 mA and 11.98 mA, respectively. The inorganic EL phosphors of EL device are increasing efficiency EL device.

• Nuclear Engineering and Technology
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• 제54권11호
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• pp.4215-4219
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• 2022

The Cd_0.95Mn_0.05Te_0.98Se_0.02 (CMTS) ingot was grown by the vertical Bridgman technique at low pressure. All wafers showed high resistivity, which suggests potential as a room-temperature semiconductor detector. The resistivity of the CMTS planar detector was 1.47 × 10¹⁰ Ω·cm and mobility lifetime product of electrons was 1.29 × 10^-3 cm²/V. The spectroscopic property with Am-241 and Co-57 was evaluated. The energy resolution about 59.5 keV gamma-ray of Am-241 was 11% and the photo-peak of 122 keV gamma-ray from Co-57 was clearly distinguished. The result shows the first detector-grade CMTS in the world and proves CMTS's potential as a radiation detector operating at room temperature.