• 대한기계학회논문집B
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• 제30권9호
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• pp.858-865
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• 2006

SMART Pilot is a multipurpose small capacity integral type reactor. Main coolant pump (MCP) of SMART Pilot is a canned-motor-type axial pump to circulate the primary coolant between nuclear fuel and steam generator in the primary system. The reactor is designed to operate under condition of $310^{\circ}C$ and 14.7MPa. Thus MCP has to be tested under same operating condition as reactor design condition to verify its performance and safety. In present wort a test apparatus to simulate real operating situations of the reactor has been designed and constructed to test MCP. And then functional tests, performance tests, and endurance tests have been carried out upon a prototype MCP. Canned motor characteristics, homologous head/torque curves, coast-down curves, NPSH curves and lift-time performance variations were obtained from the qualification test as well as hydraulic performance characteristics of MCP.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2001년도 추계 학술대회논문집
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• pp.118-125
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• 2001

The performance prediction of SMART MCP was performed using a computational fluid dynamics code. General capacity-head performance curve of MCP, which is provided to other design branches as design input, was obtained and it showed the typical type of axial pump performance curve. When four MCPs operate in parallel and one of them stops while the others continue to operate, SMART requires reduced power operation. A procedure for predicting the performance of SMART MCP for that case was developed and verified with available experimental data. An analysis based on the developed procedure was performed for two cases; the impeller of sloped MCP is fixed or free to rotate in reverse direction. According to the results, $73\%$ flow rate of normal operation enters the reactor core in the case of the locked impeller. In case of the impeller free rotation, the flow rate entering the reactor core is $62.8\%$.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 춘계학술발표회요약집
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• pp.183.1-183
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• 2001

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 추계학술발표회요약집
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• pp.144.1-144
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• 2001

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1999년도 추계학술발표회요약집
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• pp.356.1-356
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• 1999

• Nutrition Research and Practice
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• 제5권5호
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• pp.381-388
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• 2011

We compared the effects of genistein and daidzein on the expression of chemokines, cell adhesion molecules (CAMs), and endothelial nitric oxide synthase (eNOS) in tumor necrosis factor (TNF)-${\alpha}$-stimulated human umbilical vascular endothelial cells (HUVECs). TNF-${\alpha}$ exposure significantly increased expression of monocyte chemoattractant protein (MCP)-l, vascular adhesion molecule (VCAM)-1, and intercellular adhesion molecule-1. Genistein significantly decreased MCP-l and VCAM-l production in a dose-dependent manner, whereas CAM expression was not significantly lowered by genistein treatment. However, daidzein slightly decreased MCP-l production. The effects of genistein and daidzein on MCP-l secretion coincided with mRNA expression. Pre-treatment with either genistein or daidzein elevated eNOS expression and nitric oxide production disturbed by TNF-${\alpha}$ exposure. A low concentration of isoflavones significantly inhibited nuclear factor (NF)${\kappa}$B activation, whereas a high dose slightly ameliorated these inhibitive effects. These results suggest that genistein had a stronger effect on MCP-l and eNOS expression than that of daidzein. Additionally, NF${\kappa}$B transactivation might be partially related to the down-regulation of these mRNAs in TNF-${\alpha}$-stimulated HUVECs.

• 생물환경조절학회지
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• 제32권4호
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• pp.267-277
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• 2023

본 연구는 '대홍' 복숭아를 대상으로 수확 후 1-MCP 처리와 MAP가 저온 저장 중 복숭아 '대홍'의 품질 변화에 미치는 영향을 알아보고자 수행하였다. 1-MCP는 1µL·L^-1과 2µL·L^-1 농도로 처리하여, MAP 포장 후 온도 5±1℃, 습도 85±5%의 저온 저장고에서 28일 저장하였고, 포장 대조구로 골판지 상자를 설정하여 품질변화를 비교하였으며, 각각의 포장 처리구에는 1-MCP를 처리하지 않은 대조구로 두었다. 저장 중 생체중 감소율은 MAP 포장구에서 1-MCP 처리구와 무처리구 과실 간에 유의한 차이가 없었으며 MAP보다 골판지 상자 포장구의 과실에서 감소율이 높았다. 호흡률과 에틸렌 발생률은 1µL·L^-1 처리구와 2µL·L^-1 처리구에서 유사한 경향을 나타내었고, 대조구는 1-MCP 처리구와 통계적 유의성을 보이며 높게 발생하였다. 포장 내 이산화탄소는 1-MCP 처리구에서 12% 내외로 무처리구에 비해 낮았고, 에틸렌은 1µL·L^-1 처리구의 과실에서 다른 처리구와 유의성을 보이며 가장 낮게 유지되었다. 저장 기간이 경과할수록 경도는 대조구보다 1-MCP와 MAP를 처리한 과실에서는 9%(1µL·L^-1 MAP)와 5%(2µL·L^-1 MAP)로 유의하게 연화가 억제되었다. 과피와 과육의 Hunter a^* 값은 1µL·L^-1 처리구에서 대조구보다 유의하게 높았고, 안토시아닌도 1µL·L^-1 처리구에서 다른 처리구에 비해 저장 중 높은 값을 나타내었으며, 특히MAP 포장한 과실에서 높았다. 위의 결과를 종합해 보면, 1µL·L^-1를 처리한 MAP 포장구에서 '대홍' 복숭아의 저장 중 호흡률 및 에틸렌 발생량이 낮았고 경도, 과피와 과육의 Hunter a^* 및 안토시아닌 함량 변화가 적은 것으로 조사되어 '대홍' 복숭아의 저장 중 품질 유지에 가장 적합하다고 판단된다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 추계학술발표회요약집
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• pp.354.1-354
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• 2001

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1999년도 춘계학술발표회요약집
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• pp.438-438
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• 1999

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2002년도 춘계공동학술발표회요약집
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• pp.335.1-335
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• 2002