• 한국안전학회지
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• 제22권5호
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• pp.65-70
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• 2007

This paper is estimation of structure damage caused by VCE(Vapor Cloud Explosion) in enclosure. As we estimate the influence of damage which occur at gas facility in factory. We can utilize the elementary data of safety distance. In this study, the influence of over-pressure caused by VCE in enclosure was calculated by using the Hopkinson's scaling law and the accident damage was estimated by applying the influence on the adjacent structure into the probit model. As a result of the damage estimation conducted by using the probit model, both the damage possibility of explosion overpressure to structures of 20 meters away and to glass bursting of 80 meters away was nearly zero in open space explosion.

• 한국대기환경학회지
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• 제14권5호
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• pp.499-506
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• 1998

Recently almost wastes except recycled garbage are dumped into landfill site in Korea. Landfills are significant compounds (NMOCS) are produced. NMOCS include reactive volative organic compound (VOC) and hazardous air pollutants. LAEEM (Landfill Air Emissions Estimation Model) developed by Control Technology Center, V.S. EPA is used to estimate a mount of landfill gas from all landfills. As the result, landfill gas 4,121,000 ton, carbon dioxide 2,951,000 ton, methane 1,1120,000 ton are estimated as emissions from all landfills in Korea.

• 한국가스학회지
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• 제21권3호
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• pp.26-32
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• 2017

LNG 저장탱크의 외조 콘크리트는 방호벽 기능을 하는 프리스트레스 콘크리트 구조물이다. 콘크리트 구조물이 열화가 되어 안전성이 확보되지 않는 경우 구조물 붕괴 등의 위험성이 존재하게 된다. 정밀안전진단시 비파괴검사로 반발경도 및 초음파 속도 측정을 통해 구조물의 안전성과 직접적으로 관련되어 있는 콘크리트 압축강도를 추정식으로 예측할 수 있다. 그러나, LNG 저장탱크는 비파괴검사 데이터와 실제 압축강도에 대한 추정식이 부재하다. 이 연구는 LNG 저장탱크에 대해 보다 정확한 실제 강도를 측정하기 위해 Pilot LNG 저장탱크벽체로부터 코어를 채취하였다. 코어를 채취하기 전 해당위치에 일반적인 비파괴시험 방법인 반발경도 검사를 4개의 다른 영역에 각 3군데 위치에서 이루어졌다. 채취한 콘크리트 코어에 대해 압축강도 시험결과의 실제 압축강도 데이터와 반발경도 데이터를 이용하여 LNG 저장탱크의 압축강도 추정식을 개발하였다.

• 한국가스학회지
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• 제15권2호
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• pp.27-32
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• 2011

본 논문에서는 자기 누설 탐상법을 이용하여 획득한 자기 누설 신호에 SQI(self quotient image)를 적용하여 지하에 매설된 가스 배관에 발생한 결함의 길이를 추정하는 방법을 소개한다. 자기 누설 탐상 시스템(MFL)이 지나간 가스 배관은 탐상 시스템의 영구 자석에 의해 착자(magnetization) 된다. 착자된 가스 배관에 결함이나 부식 등의 손상이 있을 경우 손상 부위에서는 누설 자속이 증가한다. 본 논문에서는 자기 누설 탐상 시스템의 홀센서를 이용하여 누설 자속을 계측한 후 SQI를 적용하여 결함의 길이를 추정한다. 한국가스공사(KOGAS)의 모의 시험 배관(KPSF)에 설치된 74개의 인공결함에 대해 제안한 알고리즘과 기존의 결함 길이 추정 알고리즘들의 성능을 비교하였다.

• 한국가스학회지
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• 제13권3호
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• pp.43-48
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• 2009

The energetic and environmental problems have been getting serious after the revolution of modern industry. Therefore, demand of gas as an eco-friendly energy source is increasing. With the demand of gas, the use of gas is also increased, so injury and loss of life by the fire have been increasing every year. Hence the influence on flame caused by Vapor Cloud Explosion in enclosure of experimental booth was calculated by using the API regulations. And the accident damage was estimated by applying the influence on the adjacent structures and people into the PROBIT model. According to the probit analysis, the spot which is 5meter away from the flame has nearly 100% of the damage probability by the first-degree burn, 27.8% of the damage probability by the second-degree burn and 14.5% of the death probability by the fire.

• 센서학회지
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• 제15권5호
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• pp.328-333
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• 2006

Magnetic Flux Leakage (MFL) methods are widely employed for the nondestructive evaluation (NDE) of gas pipelines. In the application of MFL pipeline inspection technology, corrosion anomalies are detected and identified via their leakage filed due to changes in wall thickness. The gas industry is keenly interested in automating the interpretation process, because a large amount of data to be analyzed is generated for in-line inspection. This paper presents a novel approach to the tasks of data segmentation, feature extraction and depth estimation from gas pipelines. Also, we will show that the proposed method successfully identifying artificial defects.

• 한국가스학회지
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• 제18권5호
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• pp.1-5
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• 2014

첨단과학이 발전하면서 반도체의 필요성은 끊임없이 요구되고 있으며, 이러한 반도체 공정에서는 다량의 독성가스를 이용한 공정이 많다. 이러한 공정에서 가스의 누설로 인한 사고의 위험성은 항상 내재되어 있는 실정이다. 특히 국내 독성가스 사고는 암모니아와 염소에 의한 사고가 대부분이다. 따라서 본 논문에서는 LPCVD 공정에서 사용하는 암모니아와 염소의 누출로 인한 피해를 예측하여 안전에 만전을 기하고자 한다.

• 약학회지
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• 제23권1호
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• pp.7-10
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• 1979

A gas chromatographic determination of dienestrol in dienestrol cream has been studied. Dienestrol cream was dissolved in pyridine and silylation was done by using N, O-bis (trimethylsilyl) trifluoroacetamide. The derivative was injected into 3% silicone OV-17 column for chromatographic estimation. The dienestrol peak was found to be well separated from the other components of the cream. The detection limit was obtained to be $5.6{\times}10^{11}$ mol of dienestrol for this method. As there is no need for prior separation procedure, this experiment is extremely simple and less time consuming as compared to the conventional methods for estimation of dienestrol in cream.

• 대한전기학회논문지:전력기술부문A
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• 제52권8호
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• pp.471-480
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• 2003

The design of a measurement system to perform Harmonic State Estimation (HSE) is a very complex problem. Among the reasons for its complexity are the system size, conflicting requirements of estimator accuracy, reliability in the presence of transducer noise and data communication failures, adaptability to change in the network topology and cost minimization. In particular, the number of harmonic instruments available is always limited. Therefore, a systematic procedure is needed to design the optimal placement of measurement points. This paper presents a new HSE algorithm which is based on an optimal placement of measurement points using Genetic Algorithms (GAs) which is widely used in areas such as: optimization of the objective function, learning of neural networks, tuning of fuzzy membership functions, machine learning, system identification and control. This HSE has been applied to the Simulation Test Power System for the validation of the new HSE algorithm. The study results have indicated an economical and effective method for optimal placement of measurement points using Genetic Algorithms (GAs) in the Harmonic State Estimation (HSE).

• 한국환경과학회지
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• 제25권1호
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• pp.23-29
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• 2016

This study has conducted greenhouse gas emission reduction test as using Oyster-shells originated PCC paper filler compare to non-Oyster shells used PCC. This examination was estimated and calculated in accordance with both IPCC (Intergovernmental Panel on Climate Change) and World Business Council for Sustainable Development (WBSCD). The greenhouse gas emission reduction estimation result indicates that, when oyster shells are recycled and used as paper filler, it reduces $27.97tCO_2\;per\;100\;ton$ of oyster shells. It is greenhouse gas emission $44.27tCO_2$ from PCC production changed to carbon emission reduction when replaced with oyster shell. LNG greenhouse gas emission $16.3tCO_2$ in relation to the pre-treatment with oyster shell per 100 ton is also reflected. As a result, it is assumed that roughly $0.2797tCO_2/oyster\;shell{\cdot}ton$.