http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Escherichia coli 패혈증 환자에 합병된 대칭적 하지 말단 괴사증 1예
남해성,유진홍,권순석,민준기,조현선,박민경,심병주,남유정,이지인,김진수,길욱현,조근종,신완식 대한감염학회 2005 감염과 화학요법 Vol.37 No.6
We have encountered a rare case of symmetrical peripheral gangrene complicating Escherichia coli sepsis in a 47-years-old male. He was successfully treated with antibiotics, anticoagulants, and vasodilator. To our knowledge, this is the first report on symmetrical peripheral gangrene complicating E. coli sepsis in Korea.
Analysis of the effect of liquid droplet models on the reflood heat transfer using the CUPID code
Yoo, Jee Min,Cho, Yun Je,Yoon, Han Young,Jeong, Jae Jun Elsevier 2019 Nuclear engineering and design Vol.354 No.-
<P><B>Abstract</B></P> <P>The effects of liquid droplet models on the reflood heat transfer are analyzed using the CUPID code. Because the code adopts the two-fluid three-field, the droplet models for entrainment rate, deposition rate, and diameter are involved in the governing equations and constitutive models. It is, however, assumed that the droplet deposition on the heated rod during the reflood period is negligibly small. Thus, only the droplet entrainment rate and diameter models are investigated. Using the CUPID code with three well-known entrainment rate models and three diameter models, i.e., nine model combinations, six FLECHT SEASET reflood tests were calculated. The tests were also simulated using the MARS code that uses a two-fluid model. The CUPID codes with three combinations of the droplet entrainment rate and diameter models provided more accurate peak clad temperature (PCT) and quenching time (QT) than MARS, and all the nine combinations yielded better PCT prediction than MARS. Thereafter, the reflood heat transfer tests are quantitatively analyzed by using sensitivity calculations with respect to the models for film boiling heat transfer, interfacial drag, and interfacial heat transfer as well as the droplet models. The results showed the film boiling heat transfer plays the most dominant role in the PCT and the droplet entrainment at the quench front has the second largest impact on the PCT and the greatest effect on the QT.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The FLECHT SEASET reflood tests were simulated using the CUPID code. </LI> <LI> The liquid droplet entrainment has a great impact on the reflood heat transfer. </LI> <LI> The two-fluid three-field model is essential for a reflood calculation. </LI> </UL> </P>
Yoo, Jee Min,Kang, Jin Hoon,Yun, Byong Jo,Hong, Seong Wan,Jeong, Jae Jun Elsevier 2018 Progress in nuclear energy Vol.104 No.-
<P><B>Abstract</B></P> <P>During a hypothetical loss-of-coolant accident or a severe accident in a light water nuclear reactor (LWR), condensation heat transfer directly affects the pressure behavior and hydrogen distribution in the containment. This work aims at the improvement of the condensation heat transfer model in the MELCOR code, which is a fully-integrated computer code that models the progression of severe accidents in a LWR. It is known that MELCOR generally under-predicts the condensation heat transfer. For the improvement of MELCOR, we have assessed the MELCOR condensation model first. Other two models developed by Liao and Dehbi were also assessed for a comparative study. The assessment range is limited to the thermal-hydraulic conditions inside the containment building during a hypothetical design basis accident or a severe accident. We selected six condensation experiments of COPAIN, CONAN, Park, Anderson, Dehbi, and Kang and, then, assessed the three models against these data. The results of calculations showed that the MELCOR condensation model generally under-predicts the condensation heat transfer by about 45% and, however, it is the most precise and consistent in comparison with the other two models. Based on these results, the MELCOR model was selected as a base for model improvement. Then, four modifications were suggested: The effect of condensing surface curvature on condensation was considered into the MELCOR model first. The effective diffusion coefficient is applied for steam-air-helium tests. A multiplier to enhance condensation was obtained from the best fit of the calculated-to-measured plot. At last, to reflect the effect of superheated steam, a degradation factor deduced from the COPAIN experiment was adopted. The results of the modified MELCOR model showed very good agreements with most of the experimental data within ±30% error.</P> <P><B>Highlights</B></P> <P> <UL> <LI> During an accident in a nuclear power plant, condensation plays a key role for maintaining the integrity of the containment. </LI> <LI> The MELCOR condensation model is assessed against six experiments that represent containment thermal-hydraulic conditions. </LI> <LI> Based on the assessment results, the MELCOR condensation model has been modified and validated. </LI> </UL> </P>
가압 경수로 대형 냉각재 상실 사고의 재관수 과정 해석을 위한 액적 이탈 모델 개발
유지민(Jee Min Yoo),정재준(Jae Jun Jeong) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.6
가압 경수형 원자로에서 대형 냉각재 상실 사고 발생 시 재관수 기간에 노심에서 많은 양의 액적이 발생한다. 액적은 노심 냉각과 밀접한 관계가 있어 사고 전개에 상당한 영향을 준다. 따라서 재관수 해석에서 연속 액상으로부터 이탈되는 액적량을 잘 예측하는 것이 매우 중요하다. 그런데 열수력 계통해석 코드에 적용된 기존의 액적 이탈 모델들은 실험적, 이론적 근거가 부족하다. 이를 보완하기 위해 역환상류 가시화 실험에서 관찰한 액적 이탈 현상을 참고하여, 액체 시트와 액체 제트의 불안정성 분석을 통해 새로운 액적 이탈 모델을 제안하였다. 기존 모델들과 제안된 모델을 CUPID 코드에 삽입하고, FLECHT SEASET 재관수 열전달 실험을 이용해 평가하였다. 그 결과 제안된 모델이 최대 피복재 온도와 급랭 시간에 대해 가장 작은 오차를 보였고, 핵연료 높이별 온도 거동도 잘 예측하였다. In the case of a large-break loss-of-coolant accident in a pressurized water reactor, many droplets are generated at the reactor core during the reflood phase. The droplets are closely related to the core cooling, which significantly affects the accident sequence. Therefore, it is important to predict the number of droplets that detach from the continuous liquid in the reflood analysis. However, existing droplet entrainment models applied to thermal-hydraulic system codes lack experimental and theoretical basis. To solve this problem, a new entrainment model was proposed through the instability analysis of a liquid sheet and liquid jet, with reference to the droplet entrainment phenomena observed in the visualization experiment of an inverted annular flow. The existing models and proposed model were implemented into the CUPID code and evaluated using the FLECHT SEASET reflood heat transfer tests. The results show that the proposed model had the smallest error for the peak clad temperature and quenching time, and accurately predicted the temperature behavior at different heights.
오성민 ( Sung-min Oh ),최지완 ( Jee-wan Choi ),한민수 ( Min-su Han ),이연수 ( Yeon-su Lee ),정해도 ( Hae-do Jung ),유민상 ( Min-sang Yoo ),이지훈 ( Ji-hoon Lee ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1
Objectives : The unhygienic management for barracks restaurants causes distrust of civilians in peace time and loss of combat power in peace and war time. Although the restaurants are modernized by remodeling or construction, the sanitation checklist in the army regulation is still not revised for decades. So, this study was performed to improve the sanitary level of barracks restaurants by developing the sanitary checklist. Methods : We made the sanitation checklist based on the Food Hygiene Act and the reference literature and were consulted by Ministry of Food and Drug Safety and Korea Agency of HACCP Accreditation and Services. To verify effectiveness of the checklist, sanitary inspection was carried out for 28 barracks restaurants and 4 private foodservice centers by one inspector. Results : In the case of barracks restaurants, the hygienic level among the restaurants was different, with the average of 81.39, the highest point of 93, and the lowest point of 60. So, we could confirm that we needed to revise the sanitary checklist. The private foodservice centers also showed the average of 87.75, the highest point of 97, and the lowest point of 78. Therefore, even if this sanitary checklist developed in this study was applied to a private foodservice center, it was confirmed that a differentiated evaluation was possible. Conclusions : By using this checklist by the managers, inspectors, and commanders at each level, we expect to improve the sanitary level of the barracks restaurants and prevent non-combat losses caused by food poisoning accidents.