• Journal of Radiation Protection and Research
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• v.27 no.1
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• pp.21-26
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• 2002

For the consideration of the influence on radioactive contamination of foods due to rain during the release period of radionuclides in a nuclear accident, the previous dynamic food chain model was improved. Wet interception coefficients for the agricultural plants were derived as a function of radionuclide and rainfall amount, and mathematical formula of the model was also re-established. In the results for the same time-integrated radioactive concentrations on the ground, radioactive contamination of foods decreased greatly by rainfall, and it decreased dramatically according to increasing rainfall amount. It means that predictive contamination in foods using the previous dynamic food chain model, in which dry interception to the agricultural plants is only considered, can be overestimated. Among radionuclides considering in this study ($^{137}Cs,\;^{90}Sr,\;^{131}I$), influence of rainfall for food contamination was the most sensitive to $^{131}I$, and the least sensitive to $^{90}Sr$.

• Proceedings of the SAREK Conference
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• 2006.11a
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• pp.66-66
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• 2006

• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.969-971
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• 2010

전자우편(e-mail)은 매우 편리한 통신수단임에도 불구하고 무분별한 광고성 스팸메일(spam mail)의 침입과 타인의 메일을 가로채거나 변조가능성 등의 부작용 및 역기능으로 신뢰성에 문제가 되고 있다. 특히 기존의 스팸 방지 기술인 발송/수신 단계 스팸 방지 기술은 아직까지 스팸을 완벽하게 차단하지 못하고 있다. 따라서 본 논문에서는 기존의 스팸 방지 기술을 이용하여 1단계 차단을 거친 후 사용자 참여를 이용한 검증 시스템을 개발함으로써 스팸 차단 효율을 향상시키고자 한다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.213-214
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• 2000

입자상 물질을 제거하기 위한 수단으로는 싸이클론, 필터, 전기집진기, 세정탑 등이 있다. 이중에 세정탑은 설치 및 운전이 편리한 반면, 미세 입자 제거 효율이 낮아 산업체에서 제한적으로 사용되고 있다. 이러한 결점, 즉 미세 입자의 제거 효율을 높이기 위해 다양한 형태의 세정탑이 연구되었으나(Laitinen et al., 1997; Fan et al., 1988), 대부분 실험적인 연구로서 세정탑에서 입자의 제거 기작이나 크기 분포 특성을 설명하지는 못한다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.597-599
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• 2000

이제는 인터넷이 우리의 생활 깊숙히 들어와 온라인 쇼핑, 웹 기반 메일, 소프트웨어 업/다운로드 등 인터넷을 서핑하는 것이 하루 세끼 밥을 먹고, TV를 보는 것처럼 생활화되었다. 이런 인터넷을 통해 하루에도 수많은 파일들이 FTP를 통해 들어오고 나가고 있으나 현재로서는 클라이언트 단위에서 사용자가 직업 바이러스를 점검, 치료하고 있을 뿐이다. 따라서, 본 논문에서는 클라이언트에 유입되기 전 단계인 게이트웨이에서 FTP의 인터넷 트래픽을 조사형 들어오는 파일들 중 바이러스에 감염된 파일을 체크함으로써 클라이언트에 유입되기 전에 치료 및 사용자에게 재전송하는 바이러스 탐지 시스템을 제안한다.

• 한국약용작물학회:학술대회논문집
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• 2008.05a
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• pp.97-98
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• 2008

• 한국약용작물학회:학술대회논문집
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• 2008.05a
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• pp.95-96
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• 2008

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• v.5 no.3
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• pp.94-98
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• 2024

Field surveys for reports on suspected invasive termite species were received at the National Institute of Ecology's Invasive Species Reporting Center. We collected 10 termites and performed DNA sequence analysis for species identification. Specimens were confirmed as Coptotermes formosanus. This is the reconfirmation of C. formosanus in South Korea, highlighting the importance of early detection and rapid response and reaffirming the possibility of C. formosanus invading South Korea.

• Magazine of the Korean Society of Agricultural Engineers
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• v.30 no.3
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• pp.58-68
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• 1988

Most of the Korean watersheds are mountaineous and consist of various soil types and land uses And seldom watersheds are found to have long term hydrologic records. The SNUA, a hydrologic watershed model was developed to meet the unique characteristics of Korean watershed and simulate the storm hydrographs from a small mountaineous watershed. Also the applicability of the model was tested by comparing the simulated storm hydrographs and the observed from Dochuk watershed, Gwangjugun, Kyunggido The conclusions obtained in this study could be summarized as follows ; 1. The model includes the simulation of interception, evaporation and infiltration for land surface hydrologic cycle on the single storm basis and the flow routing features for both overland and channel systems. 2. Net rainfall is estimated from the continuous computation of water balance at the surface of interception storage accounting for the rainfall intensities and the evaporation losses at each time step. 3. Excess rainfall is calculated by the abstraction of infiltration loss estimated by the Green and Ainpt Model from the net rainfall. 4. A momentum equation in the form of kinematic wave representation is solved by the finite differential method to obtain the runoff rate at the exit of the watershed. 5. The developed SNUA Model is a type of distributed and event model that considers the spatial distribution of the watershed parameters and simulates the hydrograph on a single storm basis. 6. The results of verification test show that the simulated peak flows agree with the observed in the occurence time but have relative enors in the range of 5.4-40.6% in various flow rates and also show that the simulated total runoff have 6.9-32% of relative errors against the observed. 7. To improve the applicability of the model, it was thought that more studies like the application test to the other watersheds of various types or the addition of the other hydrologk components describing subsurface storages are needed.

• Korean Journal of Plant Resources
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• v.32 no.6
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• pp.677-682
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• 2019

Hand leaf thinning for improvement of fruit coloration and quality is one of the most labor-consuming works in Korean apple cultivation. The study was aimed at investigating whether foliar application of two chelate compounds (Cu-EDTA, Fe-EDTA) could defoliate effectively 'Hongro'/M.9 apple leaves and enhance fruit coloration and quality. At 30 days before harvest, foliar spray with two chelate compounds defoliated significantly the apple leaves. Chelate treatments did not affect the leaf chlorophyll content. High concentration of chelates decreased drastically photosynthetic rate of true leaves, and then it stayed in low levels, whereas low levels of chelates reduced sharply the photosynthetic rate but it was gradually restored over time. Cu-EDTA regardless of its concentration triggered higher defoliation compared to Fe-EDTA. Consequently, higher defoliation improved light interception of fruits and accumulated more anthocyanin. Particularly, Cu-EDTA could target mainly fruit cluster leaves which affect directly light interception of the fruits, i.e. more selective defoliants compared to Fe-EDTA. However, 3% Cu-EDTA rather defoliated excessively, accompanying with reduction of fruit weight and soluble solids. Therefore, our results suggest that 1% Cu-EDTA which defoliates properly the fruit cluster leaves could improve coloration and quality of 'Hongro'/M.9 apple fruits.