• 산업진흥연구
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• 제9권2호
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• pp.37-44
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• 2024

본 연구는 석유 화학사 생산공장에 설치된 스티렌 모노머 저장 탱크의 화구(fireball)와 증기운 폭발(VCE)에 대한 최악의 시나리오를 선정하고 피해 예측 및 사고영향을 분석하였다. 혼합잔사유 저장 탱크의 주성분인 스티렌 모노머 이상중합반응 시 화구(fireball)와 증기운 폭발(VCE)로 인한 복사열과 과압의 영향 범위는 e-CA 사고 피해 예측 프로그램을 적용하여 정량 분석하였다. 복사열과 폭발 과압의 피해 영향 범위는 각 최대 반경 1,150m와 626m로 분석된다. 복사열 4kW/m²이 미치는 1,150m 이내 사람은 20초 동안 노출 시 피부가 부풀어 오를 수 있다. 폭발 과압 21kPa이 미치는 626m 이내 건축물은 철 구조물의 손상과 기초에서 이탈될 수 있고, 사람은 신체 부상할 수 있다. 화재, 폭발 또는 누출 사고 발생 시 복사열, 과압에 의한 사업장 내 근로자, 인근 주민 또는 주변 시설물 등의 위험 정도와 수용 여부 위험 기준을 판단하고, 취급 물질 유해·위험성 파악, 비상대응체계 구축, 개선 및 투자 활동 등을 통해 사업장 피해 최소화 대책을 수립하는 데 도움이 될 것으로 기대한다.

• 한국가스학회지
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• 제16권6호
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• pp.29-33
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• 2012

이 연구에서는 최근의 액체수소안전관련 연구현황을 간략히 살펴보고자 한다. 액체수소 저장용기가 파손되어 액체수소가 누출될 수 있다. 누출된 액체수소는 풀을 형성하고 증발하여 수소증기 운을 형성한 뒤 증기운 폭발이 일어날 수 있다. 액체수소를 저장하고 있는 용기가 외부로부터 유입되는 열에 의하여 증발하는 가스를 처리하지 못할 경우에는 BLEVE가 발생할 수 있다. 압축된 수소가스가 있는 시설에서는 수소누출에 의한 제트화제가 발생하고 지연점화에 의하여 개방공간에서 플래시 화재 및 폭발이 발생할 수 있다. 이러한 여러 가지 사건에 대하여 최근의 기술개발과 향후연구개발 방향에 대하여 간략히 살펴보았다.

• 청정기술
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• 제11권3호
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• pp.147-152
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• 2005

초임계 이산화탄소에서의 이부프로펜의 용해도를 측정하였다. 이부프로펜의 용해도는 variable volume view cell이 장착되어있는 고압장치를 사용하여 cloud point를 관찰하는 방법으로 실험하였다. 온도의 범위는 35, 40, $45^{\circ}C$로 하였고 측정된 실험값은 Peng-Robinson equation of state로 모델링 하였다. 이부프로펜의 물리적 특성은 Lydersen, Ambrose 그리고 Joback의 group contribution method를 사용하여 구한 값을 사용하였고, 각각의 결과를 비교하였다. 이산화탄소는 이부프로펜에 대해 큰 용해력을 가진다는 것을 확인하였고, 150bar 부근에서 retrograde 현상이 일어남을 알 수 있었다. 또한 Lydersen의 group contribution method를 사용하여 얻어진 이부프로펜의 물리적 특성으로 PR-EOS와 함께 모델링 한 결과가 다른 method보다 실험값과 더 잘 일치함을 확인하였다. 결과적으로 이 실험을 통해 초임계 공정으로 이부프로펜의 미세입자화 시킬 경우 용질이 용매에 용해되어야 하는 rapid expansion of supercritical solution (RESS)방법이 적용될 수 있음을 확인하였다.

• 대기
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• 제20권2호
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• pp.131-151
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• 2010

This study establishes a conceptual model to analyze heavy rainfall events in Korea using multi-functional transport satellite-1R satellite images. Three heavy rainfall episodes in two major synoptic types, such as synoptic low (SL) type and synoptic flow convergence (SC) type, are analyzed through a conceptual model procedure which proceeds on two steps: 1) conveyer belt model analysis to detect convective area, and 2) cloud top temperature analysis from black body temperature (TBB) data to distinguish convective cloud from stratiform cloud, and eventually estimate heavy rainfall area and intensity. Major synoptic patterns causing heavy rainfall are Changma, synoptic low approach, upper level low in the SL type, and upper level low, indirect effect of typhoon, convergence of tropical air in the SC type. The relationship between rainfall and TBBs in overall well resolved areas of heavy rainfall. The SC type tended to underestimate the intensity of heavy rainfall, but the analysis with the use of water vapor channel has improved the performance. The conceptual model improved a concrete utilization of images and data of satellite, as summarizing characteristics of major synoptic type causing heavy rainfall and composing an algorism to assess the area and intensity of heavy rainfall. The further assessment with various cases is required for the operational use.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.150-152
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• 2006

The DISCOVER Project (${\underline{D}}istributed$ ${\underline{I}}nformation$ ${\underline{S}}ervices$ for ${\underline{C}}limate$ and ${\underline{O}}cean$ products and ${\underline{V}}isualizations$ for ${\underline{E}}arth$ ${\underline{R}}esearch$) is a NASA funded Earth Science REASoN project that strives to provide highly accurate, carefully calibrated, long-term climate data records and near-real-time ocean products suitable for the most demanding Earth research applications via easy-to-use display and data access tools. A key element of DISCOVER is the merging of data from the multiple sensors on multiple platforms into geophysical data sets consistent in both time and space. The project is a follow-on to the SSM/I Pathfinder and Passive Microwave ESIP projects which pioneered the simultaneous retrieval of sea surface temperature, surface wind speed, columnar water vapor, cloud liquid water content, and rain rate from SSM/I and TMI observations. The ocean products available through DISCOVER are derived from multi-sensor observations combined into daily products and a consistent multi-decadal climate time series. The DISCOVER team has a strong track record in identifying and removing unexpected sources of systematic error in radiometric measurements, including misspecification of SSM/I pointing geometry, the slightly emissive TMI antenna, and problems with the hot calibration source on AMSR-E. This in-depth experience with inter-calibration is absolutely essential for achieving our objective of merging multi-sensor observations into consistent data sets. Extreme care in satellite inter-calibration and commonality of geophysical algorithms is applied to all sensors. This presentation will introduce the DISCOVER products currently available from the web site, http://www.discover-earth.org and provide examples of the scientific application of both the diurnally corrected optimally interpolated global sea surface temperature product and the 4x-daily global microwave water vapor product.

• Journal of Advanced Marine Engineering and Technology
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• 제35권7호
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• pp.946-956
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• 2011

The main objectives of this study are to analyze the leaked gas dispersion and quantify the potential overpressures due to vapor cloud explosions in order to identify the most significant contributors to risk by using Computational Fluid Dynamics (CFX & FLACS) for gas fuelled ships. A series of CFD simulations and analyses have been performed for the various gas release scenarios in a closed module, covering different release rates and ventilating methods. This study is specially focused on the LNG FGS (Fuel Gas Supply) system recently developed for the propulsion of VLCC crude oil carriers by shipyards. Most of work presented is discussed on the gas dispersion from leaks in the FGS room, and shows some blast prediction validation examples.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.135-139
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• 1999

Wind velocity is one of the primary variables for describing atmospheric state from GMS-5. And its accurate depiction is essential for operational weather forecasting and for initialization of NWP(Numerical Weather Prediction) models. The aim of this research is to incorporate imagery from other available spectral channels and examine the error characteristics of winds derived from these images. Multi spectral imagery from GMS-5 was used for this purpose and applied to Korean region with together BoM(Bureau of Meteorology). The derivation of wind velocity estimates from low and high resolution visible, split window infrared, and water vapor images, resulted in improvements in the amount and quality of wind data available for forecasting.

• 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.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2008년도 한국우주과학회보 제17권2호
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• pp.31.4-32
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• 2008

The microwave instruments are used many areas of the space remote sensing and space science applications. The imaging radar of synthetic aperture radar (SAR) is well known microwave radar sensor for earth surface and ocean research. Unlike radar, microwave radiometer is passive instrument and it measures the emission energy of target, i.e. brightness temperature BT, from earth surface and atmosphere. From measured BT, the geophysical data like cloud liquid water, water vapor, sea surface temperature, surface permittivity can be retrieved. In this paper, the radiometer characteristics, system configuration and principle of BT measurement are described. Also the radiometer instruments TRMM, GPM, SMOS for earth climate, and ocean salinity research are introduce. As first korean microwave payload on STSAT-2, the DREAM (Dual-channels Radiometer for Earth and Atmosphere Monitoring) is described the mission, system configuration and operation plan for life time of two years. The main issues of DREAM unlike other spaceborne radiometers, will be addressed. The calibration is the one of main issues of DREAM mission and how it contribute on the space borne radiometer. In conclusion, the radiometer instrument to space science application will be considered.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2007년도 춘계학술발표논문집
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• pp.42-45
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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 it the elementary data of safety distance. In this study, the influence of explosion 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 20 meters away and that of overpressure to glass bursting 80m meters away showed nothing.