• Explosives and Blasting
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• v.24 no.2
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• pp.23-31
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• 2006

Optimum additive which gets Possible detonation sensitivity and minimum stability has been selected among several additives. It is able to mitigate a chemical reaction without destroying a structure of emulsion. Kinecker has been developed by mixing both matrix and selected additive through a perfect formulation. The detonation pressure is reduced by 40.66%(47.27% by Nitro Dyne's program), and hole pressure by 33.25% and even VOD by 52.88% against currently used emulsion explosives.

• Korean Journal of Hazardous Materials
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• v.6 no.2
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• pp.39-46
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• 2018

최근 전자제품 생산업체에서 EPS를 직접생산하게 되면서 EPS 공정이 증가하고 있다. EPS에는 펜탄이 포함되어 있으며, 펜탄은 하이브리드 혼합물로 구분할 수 있어 높은 화재폭발의 위험성을 가지고 있다. 각 공정별 펜탄의 누출률은 발포기, 사일로실, 저장실 순이나 발포기의 경우 일반적으로 밀폐되어 있으므로 사일로 실이 가장 화재폭발 위험성이 높다고 판단하였다. 사일로실의 누출률 중 70%는 사일로 상단을 통해 누출되며, 사일로 상단을 통해 누출되는 펜탄의 거동을 분석하여 사일로실 위험성 완화대책을 수립하였다. 1. 폭발위험구역 2종으로 관리, 2. 사일로상단 50cm이내 환기설비 설치 또는 Push-Pull 구조의 환기설비설치, 3. 사일로 하단 1.4m이내에 가스감지기 설치, 4. 60%이상의 습도유지

• KOREAN POULTRY JOURNAL
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• v.11 no.1 s.111
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• pp.142-143
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• 1979

필자는 질병에 대하여 풍부한 지식을 가진 수의사도 아니고 직접사육경험이 있는 양축가도 아니나 감히 붓을 들어 최근 각 지역에 폭발적으로 재연되고 있는 뉴갯슬 발병에 관해 업계의 한사람으로서 필자의 눈에 투시된 문제 점과 현황에 관해 옮겨보고자 한다.

• The Science & Technology
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• v.3 no.3 s.11
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• pp.5-8
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• 1970

1.서론 2.우주선 연구의 현황 3.태양 활동과의 관계 1)태양면 폭발 2)혹성간 공간 3)우주선 강우의 변화 4)우주선 강우의 이상변화 4,결론

• 방재와보험
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• s.107
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• pp.52-58
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• 2005

사소한 부주의로 인한 화재사고가 큰 재난을 부르기도 한다. 개개인의 의식 속에 닫혀진 방화문을 열고 화재예방과 안전을 위한 최소한의 규정인 소방기본법을 준수한다면 화재의 양상이 변하고 대형화된다. 하더라도 모두가 행복한 내일을 꿈꿀 수 있을 것이다.

• Journal of the Korean Society of Safety
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• v.7 no.3
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• pp.108-116
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• 1992

가스누설에 의한 화재는 폭발을 동반하는 경우가 많을 뿐만아니라 연소가 급격하게 이루어지고, 피해 또한 크기 때문에 이를 미연에 방지하기 위하여 지하가등 일정규모 이상의 특정방화 대상물에서 가스연소기를 사용할 경우에는 가스누설 화재경보설비의 설치를 의무화하고 있다.(중략)

• Korean Chemical Engineering Research
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• v.58 no.3
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• pp.356-361
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• 2020

Propylene is widely used in petrochemical manufacturing at over 200 ℃. However, since propylene is a flammable gas with fire and explosion risks, inert nitrogen is injected to prevent them. In this study, experiments were conducted using propylene-nitrogen-oxygen upon pressure changes at 200 ℃. At 21% oxygen, as pressure increased from 0.10 MPa to 0.25 MPa, lower explosion limit (LEL) decreased from 2.2% to 1.9% while upper explosion limit (UEL) increased from 14.8% to 17.6%. In addition, minimum oxygen concentration (MOC) decreased from 10.3% to 10.0%, indicating higher risks with the expanded explosive range as pressure increased. With increase of pressure from 0.10 MPa to 0.25 MPa, explosion pressure increased from 1.84 MPa to 6.04 MPa, and the rate of rise of maximum explosion pressure increased drastically from 90 MPa/s to 298 MPa/s. It is hoped that these results can be used as basic data to prevent accidents in factories using propylene.

• Journal of the Korean Institute of Gas
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• v.19 no.2
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• pp.12-19
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• 2015

$CO_2$ is non-flammable, non-toxic gas and not cause of chemical explosion. However, various impurities and some oxides can be included in the captured $CO_2$ inevitably. While the $CO_2$ gas was temporarily stored, the pressure in a storage tank would be reached above 100bar. Therefore, the tank could occur a physical explosion due to the corrosion of vessel or uncertainty. Evaluating the intensity of explosion can be calculated by the TNT equivalent method generally used. To describe the physical explosion, it is assumed that the capacity of a $CO_2$ temporary container is about 100 tons. In this work, physical explosion damage in a $CO_2$ storage tank is estimated by using the Hopkinson's scaling law and the injury effect of human body caused by the explosion is assessed by the probit model.

• Journal of the Korean Institute of Gas
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• v.28 no.1
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• pp.19-26
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• 2024

In workplaces handling flammable gas such as hydrogen, hazardous area is determined through KS C IEC 60079-10-1 standard. Because this standard determines the hazardous distance based on the release characteristic regardless of the type of gas, indoor/outdoor conditions, and atmospheric conditions, concerns are being raised about the effectiveness. In this study, simulations (PHAST, HyRAM) were performed to calculate the hazardous distance for hydrogen under various release characteristics and atmospheric conditions, and compared these results to IEC standard log-log graph. Also, we performed regression analysis according to each result. we found that the simulation results were 0.6 to 3.8 times less than the IEC standard, presented convenient linear regression equations. In addition, We confirmed that the results of hazardous distance varied based on wind velocity and atmospheric stability at the same release characteristic. In addition, we derived linear regression equations for release characteristics and hazardous distance that can be conveniently utilized. So, when classifying hazardous area in workplaces where they handle the hydrogen, the integrated graph and linear regression equation are helpful for confirming the hazardous area. Moreover, it is expected that the economic burden will be minimized by being able to classify reasonable hazardous area and to greatly reduce the risk of hydrogen explosion.

• Journal of KIISE:Software and Applications
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• v.28 no.5
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• pp.389-401
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• 2001

This paper proposes an abstraction mechanism of the low-level digital video features for the automatic retrievals of the explosion scenes from the digital video library. In the proposed abstraction mechanism, the regional dominant colors of the key frame and the motion energy of the shot are defined as the primary abstractions of the shot for the explosion scene retrievals. It is because an explosion shot usually consists of the frames with a yellow-tone pixel and the objects in the shot are moved rapidly. The regional dominant colors of shot are selected by dividing its key frame image into several regions and extracting their regional dominant colors, and the motion energy of the shot is defined as the edge image differences between key frame and its neighboring frame. The edge image of the key frame makes the retrieval of the explosion scene more precisely, because the flames usually veils all other objects in the shot so that the edge image of the key frame comes to be simple enough in the explosion shot. The proposed automatic retrieval algorithm declares an explosion scene if it has a shot with a yellow regional dominant color and its motion energy is several times higher than the average motion energy of the shots in that scene. The edge image of the key frame is also used to filter out the false detection. Upon the extensive exporimental results, we could argue that the recall and precision of the proposed abstraction and detecting algorithm are about 0.8, and also found that they are not sensitive to the thresholds. This abstraction mechanism could be used to summarize the long action videos, and extract a high level semantic information from digital video archive.