• 한국화재소방학회논문지
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• 제32권5호
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• pp.1-5
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• 2018

창문이 설치된 대부분의 공간에서는 커튼을 사용한다. 이러한 커튼은 대부분 가연성 소재이며 수직 설치되어 있기 때문에 화염확대의 중요 요인이다. 따라서 커튼과 같은 가연성 실내장식물의 연소특성에 관한 연구는 화재성상을 예측하는데 있어 매우 중요하다. 본 연구에서는 실내장식재로 널리 사용되는 6종류 커튼의 연소특성을 분석하기 위해 상온과 고온에서의 산소지수를 측정하였다. 실험결과 모든 시료의 고온산소지수는 상온에서보다 약 3~7.5% 낮게 측정되었으며 약 0.2%의 산소농도 차이로도 시료별 연소현상이 큰 차이를 나타냈다. 따라서 가연성 내장재의 산소지수 값으로 난연성을 평가할 경우 고온산소지수 값에 대한 충분한 고려가 있어야 할 것으로 판단된다.

• 한국세라믹학회지
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• 제22권4호
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• pp.54-60
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• 1985

Gas sensing materials for detecting flammable gases such as $CH_4$, $C_3H_8$ and n-$C_4H_{10}$ were developed by util-izing $In_2O_3$ as the principal sensing material. The sensing materials were formulated by mixing $In_2O_3$ powder with one or two other chemicals such as $SnO_2$, $Y_2O_3$ and $Al_2O_3$ with a small addition of $PdCl_2$ as a catalyst. Sample of sensor were fabricated by coating each of the mixtures on a ceramic tube impregnating ethylsili-cate and firing at 75$0^{\circ}C$ Each material mixture was evaluated by measuring and comparing gas sensitivity(resistance in air/resistance with gas) to flammable gases such as $CH_4$, $C_3H-8$ and n-$C_4H_{10}$. It was found that among fifteen compositions tested three compositions as follows show the highest gas sensitivity and thus are very feasible for commercialization as the gas sensors ; o49.5 $In_2O_3$+50 Al2O3_0.5 PdCl2(wt%) o $20In_2O_3+29$ $SnO_2+50$ $Al_2O_3+1$ $PdCl_2$(wt%) o40 $In_2O_3$+9 $Y_2O_3+50$ $Al_2O_3+1$ $PdCl_2$(wt%)

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2008년도 추계학술논문발표회 논문집
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• pp.262-269
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• 2008

Chemical products have had an favorable influence on our everyday life, and contributed very much to the development of human culture. According to the rapid change of industry and the development of scientific technique the using chemical products are increasing more and more. Chemical products can have any hazardous property such as flammability or explosiveness. There are occurring many accidents in the international trade due to the different classification and labelling of chemicals produced in various countries. The main purpose of this work is the development of global standard test methods for the chemicals, and the classification and labelling in building block approach by means of the basic technical data. Oxidizing solids, combustible solids, spontaneously combustible materials, water-prohibitive materials, flammable liquids, self-reactive materials and oxidizing liquids have been tested. The results have been classified according to the hazard material safety regulation and the UN regulation, and summarized in a data-base.

• International Journal of Precision Engineering and Manufacturing
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• 제9권4호
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• pp.63-65
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• 2008

The increased interest in reducing the environmental effects caused by releasing organic compounds and aqueous waste has motivated the development of polymeric materials in supercritical fluids. Recently, supercritical fluids have been used in material synthesis and processing because of their special properties, such as high diffusivity, low viscosity, and low surface tension. Supercritical carbon dioxide is the most attractive because it is non-toxic, non-flammable, and has moderate critical temperature and critical pressure values. Supercritical carbon dioxide can also swell most polymers. In this study, we prepared polymer/clay nanocomposites using supercritical fluids. Cloisites 10A, 15A, 25A, and 30B used in this study are montmorillonites modified with a quaternary ammonium salt. The nanocomposites of polymer/clay were characterized by X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry.

• 한국건설순환자원학회논문집
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• 제8권1호
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• pp.17-25
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• 2020

본 연구에서는 폐유리 불연 무기물 발포 보드를 개발하고, 국내 시장에서의 사용 활성화를 위한 과정으로 물리적·역학적·환경적 특성 시험을 통해 건축 내외장재로 활용하기 위한 검증을 목적으로 한다. 이를 위해, 물리·역학적 특성으로 밀도, 흡수율, 압축강도, 내동해성에 대한 시험을 실시하였으며, 환경적 특성으로 열전도율, 불연성능, 가스유해성, 중금속 함유, 곰팡이 저항성 등의 시험을 실시였다. 또한, 실제 건축물 내외장재로 활용하기 위한 적용을 실시하여 실제 건축 자재로 활용하기 위한 검증을 진행하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1913-1916
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• 1996

With a progress of electrical and electronic technology, radio-frequency circuits including high frequency components are widely applied to various industrial installations. Some of them are used in hazardous locations where explosive or flammable gases exist. As a result, ignition of such gases may be induced by a spark discharge when the radio frequency circuits are switched on or off. The purpose of this study is to investigate the ignition hazards of acetylene-air and ethylen-air mixtures experimentally based on the IEC 79-3 publication. In this experiment, we used a high frequency resistive circuit which consists of a co-axial cable, a $10{\Omega}$, $20{\Omega}$, $30{\Omega}$, $40{\Omega}$ or $50{\Omega}$ resistor and a power amplifier with frequency range up to almost 1 MHz. Experimental results show that the ignition of the acetylene-air and ethylen-air mixtures due to spark discharge depends primarily on the frequency of the power source in the resistive circuit: the minimum ignition voltage increases gradually with the increase of the frequency.

• 한국재난정보학회 논문집
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• 제20권1호
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• pp.47-59
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• 2024

연구목적: 인화성 액체의 누출형태에 따라 제조업 사업장 내 화재·폭발사고를 예방하기 위해 기존 폭발위험장소 구분도를 개선하여 점화원 및 가연물을 안전하게 관리할 수 있는 방안을 제안하고자 한다. 연구방법: 「KS C IEC 60079-10-1」를 사용하여 폭발위험장소를 계산했으며, 계산된 폭발위험거리를 3D로 폭발위험장소를 구현하였다. 또한, 3D를 통해 구현된 폭발위험장소 내 인화성 증기의 대기확산량을 계산하기 위해 「P-91-2023」 액체의 대기확산량 공식을 활용하였다. 연구결과: 폭발위험장소를 3D로 표현했을 때 평면도의 사각지대를 확인할 수 있었으며, 폭발위험장소 내 점화원을 즉각적으로 확인 가능하였다. 다음으로 가연물은 3D로 나타난 폭발위험장소 체적 내 LEL 도달시간을 계산했을 때, 폭발위험거리와 동일하게 위험도가 나타나지 않았다. 결론: 인화성 액체의 대기확산량을 고려하여 안전관리가 이루어져야 할 것으로 판단하였다. 따라서 사업장에서 현실적으로 시행할 수 있는 환기량으로 감지·경보가 필요한 농도값을 계산하는 방법을 제안하였다.

• 한국분말재료학회지
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• 제26권1호
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• pp.28-33
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• 2019

The gas sensor is essential to monitoring dangerous gases in our environment. Metal oxide (MO) gas sensors are primarily utilized for flammable, toxic and organic gases and $O_3$ because of their high sensitivity, high response and high stability. Tungsten oxides ($WO_3$) have versatile applications, particularly for gas sensor applications because of the wide bandgap and stability of $WO_3$. Nanosize $WO_3$ are synthesized using the hydrothermal method. As-prepared $WO_3$ nanopowders are in the form of nanorods and nanorulers. The crystal structure is hexagonal tungsten bronze ($MxWO_3$, x =< 0.33), characterized as a tunnel structure that accommodates alkali ions and the phase stabilizer. A gas detection test reveals that $WO_3$ can detect acetone, butanol, ethanol, and gasoline. This is the first study to report this capability of $WO_3$.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.54-55
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• 2020

Recently, "The rules on the standards of evacuation and fire protection of buildings" require that non-burnable materials such as non-combustible and semi-non-combustible materials be used as the materials applied to the building's exterior walls, but styrofoam, which is a combustible material, has been applied a lot and became a social issue. In this study, we developed a non-combustible outer wall molding to secure construction and economic feasibility and free expression using CLC(CLC: Cellular Light-weight Concrete).

• 한국위험물학회지
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• 제3권1호
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• pp.52-58
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• 2015

Since the HF release in 2012 in Korea, it became one of the most significant to evaluate consequence to the vicinity of industry facilities handling hazardous materials. BTX plant is selected to assess off-site risk to check whether the facility satisfies the Chemical Control Law by Korea Government. Accident scenarios were listed using process safety information. The scenarios having effect to the off-site were selected and assessed further according to guideline provided by Korea government. Worst case and alternative scenarios including other interested scenarios were evaluated using ALOHA. Each evaluated scenario was assessed further considering countermeasures. The results showed that the facility handling chloric acid is safe enough and needed no further protections at the moment.