• Nuclear Engineering and Technology
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• v.44 no.5
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• pp.535-542
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• 2012

A sodium-cooled demonstration fast reactor with the KALIMER-600 as a reference plant is under design by KAERI. The safety grade decay heat removal system (DHRS), which is important to mitigate design basis accidents, was changed in the reactor design. A loss of heat sink and a vessel leak in design basis accidents were simulated using the MARS-LMR system transient analysis code on two plant systems. In the analyses, the DHRS of KALIMER-600 had a weakness due to elevation of the overflow path for the DHRS operation, while it was proved that the DHRS of the demonstration reactor had superior heat transfer characteristics due to the simplified heat transfer mechanism.

• Journal of the Korean Institute of Gas
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• v.18 no.5
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• pp.1-5
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• 2014

As high-tech science has developed, the need of semiconductor is required constantly. However, there are many processes which use a great deal of poisonous gas in the semiconductor process, so the dangerousness by a gas leak is latent in these processes. Especially, the accident of toxic gas is almost made by ammonia and chlorine. Therefore this report estimates the damage by the leak of ammonia and chlorine used in LPCVD system.

• Applied Science and Convergence Technology
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• v.25 no.3
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• pp.47-50
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• 2016

Low temperature test for half-wave resonator (HWR) cryomodule is performed at the superfluid helium temperature of 2 K. The effective temperature is defined for non-uniform temperature distribution. Helium leak detection techniques are introduced for cryogenic system. Experimental set up is shown to make the low temperature test for the HWR cryomodule. The cooldown procedure of the HWR cryomodule is shown from room temperature to 2 K. The cryomodules is precooled with liquid nitrogen and then liquid helium is supplied to the helium reservoirs and cavities. The pressure of cavity and chamber are monitored as a function of time. The vacuum pressure of the cryomodule is not increased at 2 K, which shows leak-tight in the superfluid helium environment. Static heat load is also measured for the cryomodule at 2.5 K.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.685-687
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• 2021

본 논문에서는 플랜트 배관의 기체 누출 탐지방안에 대하여 기술한다. 배관 누출 발생 시 배관 내부 압력과 누출부 크기의 조합에 따라 누출 초음파 발생 여부가 결정되는데, 누출 시 초음파가 발생하는 경우와 그렇지 않은 경우에 대하여 배관 누출을 탐지하는 방안과 보온재 배관의 누출탐지 방안에 대하여 설명한다. 또한 배관 파단을 상시감시하기 위한 대량의 무선센서 운용에 따른 대량 누출탐지신호의 실시간 처리를 위한 쿠버네티스 기반의 분산처리형 진단 시스템 구현 방안에 대하여 기술한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.213-214
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• 2010

• Fire Protection Technology
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• s.11
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• pp.13-22
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• 1991

To understand electrical fire, the cause of it is classified into overcurrent, short circuit, leak, joint, overheat, accumulation of heat, spark, deterioration of insulation, static electricity, and lightning etc. and explained. And then by the precautions to it, proposed to the improvement of electric products, the completeness of safecty management and the use of alarm systems.

• 한국IT서비스학회:학술대회논문집
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• 2008.05a
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• pp.567-571
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• 2008

As computer technology grows, the risk of personal information leak on the internet is also increasing. A so-called "cookie" is used as one of the ways personal information leaks. A cookie offers convenience on the internet but serves as a major reason for personal information leakage at the same time. In this paper, we discuss risks and potential managements of a cookie.

• Nutrition Research and Practice
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• v.1 no.4
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• pp.298-304
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• 2007

This study was conducted to investigate the hypocholesterolemic effect of simvastatin (30 mg/kg BW) and antioxidant effect of coenzyme Q10 (CoQ10, 15 mg/kg BW) or green tea (5%) on erythrocyte Na leak, platelet aggregation and TBARS production in hypercholesterolemic rats treated with statin. Food efficiency ratio (FER, ADG/ADFI) was decreased in statin group and increased in green tea group, and the difference between these two groups was significant (p<0.05). Plasma total cholesterol was somewhat increased in all groups with statin compared with control. Plasma triglyceride was decreased in statin group and increased in groups of CoQ10 and green tea, and the difference between groups of statin and green tea was significant (p<0.05). Liver total cholesterol was not different between the control and statin group, but was significantly decreased in the group with green tea compared with other groups (p<0.05). Liver triglyceride was decreased in groups of statin and green tea compared with the control, and the difference between groups of the control and green tea was significant (p<0.05). Platelet aggregation of both the initial slope and the maximum was not significantly different, but the group with green tea tended to be higher in initial slope and lower in the maximum. Intracellular Na of group with green tea was significantly higher than the control or statin group (p<0.05). Na leak in intact cells was significantly decreased in the statin group compared with the control (p<0.05). Na leak in AAPH treated cells was also significantly reduced in the statin group compared with groups of the control and CoQ10 (p<0.05). TBARS production in platelet rich plasma was significantly decreased in the groups with CoQ10 and green tea compared with the control and statin groups (p<0.05). TBARS of liver was significantly decreased in the group with green tea compared with the statin group (p<0.05). In the present study, even a high dose of statin did not show a cholesterol lowering effect, therefore depletion of CoQ10 following statin treatment in rats is not clear. More clinical studies are needed for therapeutic use of CoQ10 as an antioxidant in prevention of degenerative diseases independent of statin therapy.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2007.04a
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• pp.129-146
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• 2007

[ ${\square}$ ] A mathematical model has been developed and used to analyze the limits of He fine leak test. ${\square}$ Uncertainties inherent in using the MIL-STD-883 guidelines for hermeticity evaluation of small packages have been demonstrated. ${\square}$ A new methodology to quantitatively characterize hermeticity has been developed.

• Journal of the Korean Applied Science and Technology
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• v.35 no.3
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• pp.606-611
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• 2018

City natural gas is classified flammable hazardous gas and should be secured according to explosion risk assessment determined by Industrial Standard KS C IEC. In this study, leak size, ventilation grade and effectiveness were adopted to the KS C IEC for risk assessment in natural gas supply system. To evaluate the applicability of the computational fluid dynamics (CFD), the risk assessment was studied for four different conditions using hypothetical volume($V_z$) valuesfrom gas leak experiments, KS C IEC calculation, and CFD simulation.