• 한국환경성돌연변이발암원학회:학술대회논문집
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• 한국환경성돌연변이발암원학회 2003년도 춘계학술대회
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• pp.75-75
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• 2003

• 한국독성학회:학술대회논문집
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• 한국독성학회 2003년도 춘계학술대회 논문집
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• pp.75-75
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• 2003

Silica has been known to be a factor in acute cell injury and chronic pulmonary fibrosis. In Rat2 fibroblasts, silica induced the activation of NFkB, which plays a crucial role in regulating the expression of many genes involved in the subsequent inflammatory response. In addition, we observed that TAK1 and NIK were involved in silica-mediated NF-kB activation in Rat2 cells. (omitted)

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2012년도 심포지엄 및 춘계학술발표회
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• pp.231-232
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• 2012

• Bulletin of the Korean Chemical Society
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• 제34권6호
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• pp.1906-1908
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• 2013

• 복식
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• 제8권
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• pp.15-27
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• 1984

A costume study is a part of the cultural history and also has the greatest relation to life's senses as a concrete culture. Korean costume that consists a double structure with Chinese one through Chosun Dynasty five hundred years, has recently changed up to the Western Form. In this respect Korean Costume has a important meaning in relation to Western costume. Traditional costume, generally speaking, has tendency to keep up by the common people than the higher classes. Then there were four classes. They are aristocratic classes common people, those who are engaged in the form, industry, trade and low classes. Merchant of them partially took charge of the cultural exchange about contacting with tradition and new one. Because it's easy to flow in one's character the new civilization. So there is an important significance to research of the merchant's costume in Gae Hwa Gi changing age of civilization in politics, economic, and social system. The records appeared about the merchant's costume in the age of civilization through literature study and natural photo at that time.

• 전기학회논문지
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• 제58권2호
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• pp.217-224
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• 2009

This paper presents a new AC/DC converter scheme for HVDC system to achieve a high power factor operation. The new AC/DC converter consists of two 12-pulse bridge converters in series: the primary and auxiliary converters. Ignition angles of the main and auxiliary converters are controlled independently to maintain the nominal DC voltage and control auxiliary voltage. The resulted DC voltage obtained by superimposing the above two phase modulated voltages can be controlled very rapidly over a wide range, and a high power factor operation is achieved. Performance improvements in power factor and harmonic distortion are validated by theoretic derivations and experiments with prototype HVDC system. With the proposed converters, investment for reactive power compensation and filter in HVDC system can be saved significantly.

• 한국물환경학회지
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• 제24권5호
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• pp.592-597
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• 2008

Current water quality standard (WQS) in Korea is based on the protection of human health, not considering the protection of aquatic organisms. Most of chemicals can be toxic to ecological biota as well as human. Health of aquatic biota is closely related to the human health via food chain, therefore ecological risk based-WQS needs to be developed to protect the aquatic ecosystem. In this study, we selected the 31 chemicals in the Project entitled 'Development of integrated methodology for evaluation of water environment'. The methodology for calculating water quality criteria was derived from the Australian and New Zealand processes for deriving guideline trigger value for aquatic ecosystem. The available ecotoxicity data were collected from US EPA's ECOTOXicology Database (ECOTOX), TOX-2000 Database, European Chemicals Bureau (ECB)'s International Uniform Chemical Information Database (IUCLID) and Environmental Protection Agency (US EPA)'s report 'Ambient Water Quality Criteria (AWQC)'. The aquatic toxicity data for the Korean species were selected for risk assessment to reflect the Korean water environment. The monitoring values were calculated from the water quality monitoring data four main Korean rivers. We suggested the order of priorities of chemicals based on ecological risk assessment. We expect that these results can be useful information for establishing the WQS for the protection of aquatic ecosystem.

• 한국응용곤충학회지
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• 제16권1호
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• pp.1-6
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• 1977

우리나라에서 처음 발생되었던 Kresek에 과한 발생의 균형 및 재현에 관한 시험결과는 다음과 같았다. 흰빛잎마름병균에 의한 Kresek 현상은 주로 남부방인 전라남도 화순, 무안, 강진, 영암, 곡성, 광산, 경상남도 진양군에서 볼 수 있었다. Kresek 발생지의 병원균의 균형은 I, II, IV, V군에 의한 발생을 나타냈다. 3. Kresek이 가장 심하였던 화순군에서는 21균주중 17균주는 IV군, 2균주는 II군, 2균주는 V군이었으며 광산군의 5균주는 IV군dp 속하는 균주였다. 4. 화순군에서는 II, IV, V군이 혼재하고 있음을 볼 수 있었다. 5. Kresek 재현에 관한 시험에서는 접종 5일만에 발병을 볼 수 있었으며 뿌리 절단법에서 발병율이 현저히 높았고, 분무접종, 침접종에서도 발병을 볼 수 있었다. 6. 병원균농도가 높을수록 발병이 많았다.

• 전자공학회논문지SC
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• 제39권5호
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• pp.43-50
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• 2002

다이오드 정류회로의 전류 파형을 향상시키기 위해서 배전압 다이오드 정류회로에 대한 새로운 동작원리를 제안하였다. 기존의 배전압 정류회로는 대용량 캐패시터를 이용하여 출력전압을 높였으나 제안한 회로는 소용량의 캐패시터와 리액터를 이용하기 때문에 출력전압은 높아지지 않지만 입력전류의 파형을 개선할 수 있다. 그리고 역률과 효율이 각각 97[%], 98[%]을 얻을 수 있다. 제안한 정류기는 고조파 규제값과 스위치가 서로 영향을 미치지 않고 다이오드와 인덕터 그리고 콘덴서로 구성된 비선형 임피턴스 회로이다. 또한 일반적인 펄스 폭 변조 인버터와 하프 펄스 폭 변조 인버터를 비교하여 설명하였으며 제안된 하프 펄스 폭 변조 인버터에 의해서 낮은 스위칭 손실과 오버슈팅을 제어할 수 있다.

• Journal of the Korean Data and Information Science Society
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• 제19권3호
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• pp.723-734
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• 2008

The main reason for deinterlacing is frame-rate conversion. The other reason for deinterlacing is of course improve clarity and reduce flicker. Using a deinterlacer can help clarity and stability of the image. Many deinterlacing algorithms are available in image processing literatures such as ELA and E-ELA. This paper propose a new statistical deinterlacing algorithm based on statistical tests such as the Bartlett test, the Levene test and the Kruskal-Wallis test. The results obtained from the proposed algorithms are found to be comparable to those from many well-known deinterlacers. However, the results in the proposed deinterlacers are found to be more efficient than other deinterlacers.