• Analytical Science and Technology
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• v.22 no.3
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• pp.191-200
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• 2009

The aim of this study was to evaluate and establish of emission test method for liquid phase building materials such as paint, adhesive, sealant by emission cell. A small-scale emission chamber and emission cell were used to evaluate emission of TVOC from paint, adhesive, sealant. The quantity of TVOC emission were measured by a gas chromatography/mass spectrometry (GC/MS). Background concentration of TVOC was below $10{\mu}g/m^3$ in the emission chamber and cell. Air tightness and recovery in chamber and cell showed good results. The recovery of thermal desorber for toluene and n-dodecane were about 120%. The repeatability of response factor and retention time in GC/MS below 30%. The method detection limit of VOCs ranged 0.04~8.82 ng. The concentration of TVOC emission using emission cell was 1.35~1.41 times higher than emission chamber. The correlation of TVOC emission using chamber and cell method was significantly high (r=0.91~0.97).

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1996.05a
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• pp.255-262
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• 1996

고고도로 비행하는 위성발사체의 로켓모터는 압력이나 열적인 조건등이 지상과는 다른 저압환경에서 작동되기 때문에 그 성능이나 기능에 큰 영향을 받는다. 따라서 정확한 로켓의 추력과 자체의 신뢰성향상을 도모하기 위해서 로켓모터의 작동시험을 지상에서 저압환경을 모의하여 수행할 필요가 있다. 본 논문에서는 이러한 저압환경을 위한 시험장치의 종류 및 성능특성과 설계방법을 논하였다.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.566-568
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• 2005

STACIR/AW은 최근 사용이 증가되고 있는 증용량전선으로 기존 송전선에 비해 많은 전류를 송전하면서도 이도특성이 우수한 장점을 가지고 있다. 이 논문에서는 STACIR/AW 전선의 온도 및 대전류특성에 대한 실증시험을 위하여 구축된 송전선로용 3[kA]급 대전류 발생 장치를 이용해 345kV 송전선로의 표준경간인 350m 시험선로에 $480\;mm^2$ 및 $410\;mm^2$ 전선을 가선하여 전류 특성 시험을 수행하였다. 본 논문에서는 최대 허용전류에 대한 단계별 이도특성을 외기 조건과 전선의 장력 변화를 고려하여 고찰하여 국내 주요 전선사의 증용량전선에 대한 신뢰성을 검증하고, 또한 계절별 특성시험 및 환경시험 챔버를 이용한 참고시험과 기본적 동적해석을 통하여 외기 조건에 전선의 최대허용전류를 검토하였다. 또한 실선로에 적용된 $480\;mm^2$ 및 $410\;mm^2$ 의 증용량 전선에 최대 부하율을 파악하고 동일 조건에 부하전류를 인가한 실증시험을 통하여 전선의 이도증가율을 분석하여 상용선로의 운전조건을 검토하였다.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 1997.12a
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• pp.114-114
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• 1997

• The Monthly Technology and Standards
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• s.40
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• pp.21-24
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• 2005

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.6
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• pp.1099-1107
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• 1992

The apparent strain of temperature self-compensated strain gages at cryogenic temperature is presented. By joining the international round robin test on electrical strain gages at cryogenic temperatures, apparent strain curves of up to the fourth order with respect to the temperature are obtained with different strain gages and different materials. The liquid nitrogen and the liquid helium are employed to get the cryogenic environment. The results can be effectively utilized to determine the real strains by mechanical loading at cryogenic temperature. This paper also describes the optimal selection of strain gages and test materials for the use of strain gages at cryogenic temperature.

• Journal of the Korea Institute of Building Construction
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• v.16 no.6
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• pp.595-601
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• 2016

The insulation performance of the insulation currently used in building structures is reflected only during design based on initial performance and the reduction in heat insulation performance due to the degradation of long-term durability is not reflected. This study reviewed the degradation of heat insulation performance due to the durability degradation of insulating materials through the accelerated durability test. The study findings showed that the foamed polystyrene insulation bead method did not show performance degradation due to aging in the standard environmental condition and laboratory accelerated test condition but the performance is degraded in the freeze-thaw test condition. On the other hand, in the case of the extrusion method, the degradation of the heat insulation performance was less in the freeze-thaw test condition, but the rapid performance degradation was caused by the release of the internal gas at the beginning of aging. In addition, the hard polyurethane foam insulation showed better initial insulation performance than other insulation materials, but the performance was found to be degraded somewhat under laboratory accelerated test conditions and freeze-thaw test conditions.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2006.04a
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• pp.203-206
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• 2006

본 논문에서는 폐타이어를 지반보강재로 재활용하는 경우 배수조건에 따른 용출특성을 알아보기 위하여 실내실험을 실시하였다 배수조건과 비배수조건으로 연속식 용출시험을 수행하여. 유출수의 pH, 탁도, TOC, Zn 농도를 분석하였다. 실험결과 배수조건인 경우 시간이 경과할수록 용출 농도가 감소하여 주변 환경에 큰 영향을 미치지 않을 것으로 판단되나, 비배수 조건인 경우 용출 농도가 증가하는 현상을 발견할 수 있었다. 배수조건은 폐타이어가 지하수위 위에 존재하는 경우이며, 비배수조건은 폐타이어가 지하수위 아래에 존재하는 경우에 해당한다. 특히, 폐타이어가 지하수위 아래에 위치하는 경우 지오텍스타일의 클로깅 등으로 인하여 배수가 원활히 되지 않을 경우에는 주변환경에 큰 영향을 미칠 것으로 예상되며 이에 대한 각별한 주의가 필요할 것이다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.6
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• pp.683-691
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• 2011

In order to develop technology for an equipment qualification (EQ) test, which is an important process in localizing solenoid-operated valves used in nuclear power plants, we analyzed related regulations, test procedures, conditions, equipment, and acceptance criteria. EQ regulations for the solenoid-operated valve are classified as law, guide, and standard, and are subdivided according to test specimens and contents. The EQ test is composed of functional, normal-, and accident- condition tests. The solenoid-operated valve is aged under normal and accident conditions, which are predicted in the design conditions of a nuclear power plant, and the performance of the valve is measured by a functional test. The test method and procedure analyzed in this paper might be very useful for manufacturers as well as EQ testers.

• Journal of the Korean Recycled Construction Resources Institute
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• v.2 no.4
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• pp.307-313
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• 2014

Recent interest in the increased structural performance and durability evaluation of this concrete structure in a salt damage environment is increasing. The most secure and reliable method of accelerated corrosion test is a method to carry out the rebar corrosion monitoring can be exposed directly to the marine test site exposure. However, long-term exposure testinghas the disadvantage that a long period is necessary. So, a lot of research on RC of salt damage environment have beenpromoted as alternatives to replace this. However, accelerated corrosion test, in the short term only is appropriate and is but an accelerated test method to evaluate the critical chlorine concentration, there is a difficult problem that you still get the answer. It is one of the correlation problems accelerated test correspond to a certain period of exposure environment. Therefore, in this study, to clarify the differences rebar corrosion beginning, through the actual corrosion accelerated test in corrosion time and laboratory test chamber of the structure of the marine environment results in both environments, it is an object of correlation coefficient derived.