• Journal of Energy Engineering
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• v.23 no.3
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• pp.21-26
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• 2014

EU-APR1400, the Korean nuclear reactor design for European market adopts a so-called core catcher for ex-vessel molten corium retention and cooling as a severe-accident mitigation system. Sacrificial material, which controls melt properties and modifies melt conditions favorable for corium cooling and retention, is usually employed to protect core catcher body from molten corium. Since molten corium can be ejected through a breach of a reactor pressure vessel and impinged on the sacrificial material with enhanced heat transfer at a severe accident, it is very important to predict ablation rate of sacrificial material due to corium jet impingement accurately for core catcher design. In this paper, sacrificial-material ablation model based on boundary layer theory is suggested and compared with the experimental results by KAERI.

• 한국사회정책
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• v.23 no.1
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• pp.125-150
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• 2016

This study was carried out to empirically analyze the hypothesis that the impact of the welfare status on the welfare attitudes is moderated by each individual's level of confidence in government. To do this, this study focused on the welfare status known as the significant predictors of welfare attitudes and measured the welfare status as a gap between 'welfare contribute' and 'welfare benefit' in a single dimension, which is defined as 'material sacrifice'. Also, this study examined the main effect of material sacrifice and trust in government on the welfare attitudes and moderating effect of trust in government on relationship between material sacrifice and welfare attitudes. This study was performed with secondary data from 8th year of "2013 Korea Welfare Panel Study". Hypothesis of this study were verified using hierarchical multiple regression analysis. The major findings of this study are summarized as follow. 'Material sacrifice' was found to be negatively associated with the welfare attitudes. However, as the confidence in which social policies will be carried out competently by government increases, it was confirmed that the negative effect of material sacrifice on the welfare attitudes was moderated. It suggests that self-material interests associated with welfare could be moderated by beliefs and expectations about the government's functions, which means that expanding the reliance on the social policy is an important task in order to lead a social consensus for the welfare expansion.

• KOREAN POULTRY JOURNAL
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• s.112
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• pp.52-55
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• 1979

항생물질을 사용하여 입는 피해는 계속 증가하고 있으나 과학적인 진단과 처치를 하기 위한 환경은 아직도 미비하다. 여기에 투여되는 인건비 및 시설비를 두려워하여 주먹구구식의 처방이 난무할 때 몇십배의 희생을 양계인이 감수할 것인가?

• Korean Security Journal
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• no.41
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• pp.123-151
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• 2014

The purpose of this study was focused on the relationship between private guards' job embeddedness and dual commitment. In this study, job embeddedness is selected as an independent variable and dual commitment is selected as a dependent variable one. job embeddedness was divided into three sub-factors such as "fit", "links", and "sacrifice", and dual commitment is again composed with organizational commitment, and career commitment. Moreover sex, age, academic background, service period, and income were selected as a control variable. To test the hypotheses, survey data from private guards in Kyungpook are collected and analyzed. Principal component method is used to see which items cluster together in each factor and to calculate factor scores. Multiple regression analysis identifies several factors which have significant effects on dual commitment. Key finding can be summarized as follow. Fist, the factor of "fit" have significant effects on organizational commitment, and career commitment. Second, the factor of "links" have significant effects on organizational commitment, and career commitment. Third the factor of "sacrifice" have significant effects on organizational commitment, and career commitment. Finally, when all the variables with significant effects are included in the final model, "links" disappear, while "fit" and "sacrifice" remain statistically significant. Based on these finding, this study suggests some policy issues to promote private guards' dual commitment.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.195-195
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• 2010

본 연구에서 제작한 u-bolometer 은 적외선을 흡수하는 멤브레인이 a-Si 위에 Ti 메탈로 이루어져 있다. 이 u-bolometer 는 MEMS 센서로써 3차원 공진 구조를 제작하기 위해서는 희생층을 제거하는 공정이 필수적이며 이 희생 층으로 Polyimide를 사용하고 있는 공정에서 Plasma Ashing 공정은 더욱더 필수적이다. 이 Ashing 공정은 O2 플라즈마를 이용하며 이때 흡수물질인 Ti 레이어가 플라즈마에 의해 면저항과 흡수율의 특성이 어떻게 변화되는지 플라즈마 공정 전후를 분석한 결과 면저항의 변화가 나타났으며 uniformity도 높게 변화하였다. 또한 적외선 흡수율이 약 5% 차이가 나타나는 것을 확인 할 수 있었다.

• The Korean Chronic Disease News
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• no.307
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• pp.1-18
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• 2006

경기도 의왕시 보건소 임인동 소장/의료비지출 OECD국가 중 최하위/“암환자 96%가 정상활동 못해”/MRI 진료비 18.2% 환불조치/“진료비 부당 청구 심사 강화”/대형병원 환자 집중현상 심화/제왕절개 분만율 평가결과 공개/KGMP 국제적 수준 높인다/완제의약품 생산국가 표기‘명확’/“국내 제약산업 희생양”안 된다/‘산디문 뉴오랄’당뇨 발현억제/지역사회정신보건사업 선도적 추진/지역보건의료계획 어떻게 추진되고 있나/버섯, 항암 등 15가지 약리효과 입증/자궁경부암은 HPV가 주원인이다/증상 없다고 대장암 안심은‘금물’/1급발암 물질 석면 사용 금지/고지혈증/당뇨병과 비만/

• Journal of Korean Society of Environmental Engineers
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• v.31 no.12
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• pp.1081-1088
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• 2009

The performance of a electrocoagulation (EC) process was examined for the removal of Rhodamine B (RhB) using iron electrode. The effects of operational parameters such as electrode material (aluminum and iron), current density, NaCl dosage, intial pH and initial dye concentration on RhB removal efficiency were investigated. The optimum range for each of these operating variables were experimentally determined. The experimental results showed that the iron is superior to aluminum as sacrificial electrode material. The optimum time of electrolysis, current density, NaCl dosage and pH were 10 min, 1630 A/$m^2$, 4 g/L and neutral pH, respectively. Under these conditions, RhB was effectively removed (> 93.4%) and also more than 80% of COD was removed (> 88.9%) when the initial concentration of RhB was 230 mg/L. The electrical energy consumption in the above conditions for the color and COD of RhB removal were 10.3 and 10.8 kWh/kg RhB, respectively. The electrocoagulation process could be a promising technology to treat dye wastewater containing RhB.

• Journal of the Korean Institute of Gas
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• v.21 no.1
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• pp.6-17
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• 2017

Objectives : The purpose of this study was to obtain information regarding Globally Harmonized System(GHS) classification and health hazards that may result from a 4 weeks inhalation exposure of 3-Methylpentane in Sprague-Dawley rats. Methods : The testing method was conducted in accordance with OECD guidelines for the testing of chemicals No. 412(Subacute Inhalation Toxicity). The Rats were divided into 4 groups(5 male and 5 female rats in each group) and exposed to 0 ppm, 284 ppm, 1,135 ppm, 4,540 ppm 3-Methylpentane in each exposure chamber for 6 h/day, 5 days/week, for 4 weeks. After two weeks, the test animals were autopsied and carried out blood test and biochemical tests and histopathological examination. We used PRISTIMA (Toxicology data management system) to confirm the system and to have confidence of the raw data. Results : No death and particular clinical presentation including weight change and change of feed rate was observed. Relationship between dose, gender and response was also not significantly changed in hematologic examination, biochemical examination of blood and blood coagulation time. The histopathologic lesions caused by the test substance did not appear. Conclusions : NOAEL(No Observable Adverse Effect Level) of 3-Methylpentane is more than 4,540 ppm in male group and female group and the Ministry of Employment and Labor Guidance Announcement No. 2013-37(criteria for the classification marks and Safety of Chemicals) Specific target organ toxicity(repeated exposure) was determined with a substance that is not the separator material.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.4
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• pp.425-429
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• 2011

In the unlikely of nuclear reactor meltdown, the leaked core melt or corium must be contained in a device called core-catcher so that the corium can be cooled and stabilized. The ex-vessel behavior of corium involves complex physical and chemical mechanisms of flow propagation, heat transfer, and reactions with sacrificial substrates. In this study, the detailed characteristics of corium flow and heat transfer were investigated by using a commercial CFD code for VULCANO VE-U7 test reported in the literature. The volume-of-fluid (VOF) model was used to predict the interfacial surface formation of corium and the surrounding air, and the discrete ordinate model was adopted to calculate radiation between corium and the surroundings. It was found that cooling via radiation through the top surface of corium had a dominant effect on the temperature and viscosity profiles at the front of the corium flow.

• Proceedings of the KSAR Conference
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• 2004.06a
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• pp.271-271
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• 2004

본 실험은 TGF-a를 처리하여 분화가 유도된 인간배아 줄기세포를 파킨슨 동물모델에 이식하여 숙주세포에서의 생존 및 이식효과를 검토하고자 실시하였다. TGF-a로 분화된 세포의 이식효과를 판정하고자 배양시 TGF-a처리군과 처리하지 않은 군으로 나누어 분화를 유도한 인간배아 줄기세포를 hoechst33342로 표지 하여 병변 유발과 동일한 방법으로 동측 선조체내에 4×10⁴개/2ul가 되도록 이식하고(이식 위치: AP 0.7, ML 2.0, DV3.4) 이식 후 2, 4주에서 행동학적 변화를 관찰하고 4주에 동물을 희생시켜 4% PFA를 이용하여 뇌 조직을 고정하고 뇌 조직은 40㎛ 두께로 동결 절편을 만들어 면역조직화학염색을 시행하여 신경세포로의 분화 및 TH 발현 여부를 관찰하였고 분화의 표지물질로 nestin, NF200, GFAP, TH를 사용하여 형태학적 변화를 관찰하였다. (중략)