• Fire Science and Engineering
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• v.22 no.1
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• pp.68-75
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• 2008

In this paper, we introduce a fire-detection system which is robust to light sources and environment changing. We can decide the threshold values that classify the regions between a fire flame and light sources by analyzing them in RGB color space. But we could not discriminate quasi-flame region from fire flame region with the value. The difference of mean-histogram technique make it possible to extract flame region more efficient because fire flame is continuously changing after it occurs. In order to validate real fire, this paper uses regional compactness in the end of process. Computer simulation show that proposed method make more robust to light sources and environment changing.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.109-112
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• 2012

원자력발전소는 타 산업시설에 비해 화재발생 가능성이 낮으나 방사성물질 누출가능성을 최소화하기 위하여 심층방어와 다중방호 설계를 통한 안전성확보가 매우 중요하다. 이를 위해 국내에서는 화재위험도분석(FHA)과 안전정지능력분석(SSA) 및 화재 확률론적안전성분석(Fire PSA)을 수행하고 있으며, 이 중 화재 PSA는 주요 화재구역 선별, 구역별 화재발생빈도 및 기기손상확률 계산, 화재사고 경위분석 및 화재취약성 파악 등을 분석한다. 본 논문에서는 미국 원자력규제위원회(USNRC)와 전력연구소(EPRI)가 공동 연구개발한 화재 PSA 방법론인 NUREG/CR-6850 기법을 적용하여, 화재 PSA에 필요한 화재점화빈도(Fire Ignition Frequency)를 정량적으로 계산하였다. 정확한 결과값을 도출하기 위해 매크로를 이용한 프로그램인 FIFA(Fire Ignition Frequency Analyzer)를 개발하였으며, 향후 국내 원전 화재 PSA 분석업무에 유용하게 사용될 수 있을 것으로 기대된다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.7-10
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• 2012

최근 고층건물 화재의 대표적 사례인 부산 해운대 우신골드스위트 주상복합건물 화재 확대의 주요 원인으로 작용했던 석유화학제품 중 배관보온재를 감싸고 있는 보온필름의 화재특성에 대해 연구를 하였다. 본 화재결과 배관보온필름이 화재취약성을 가지고 있는 것으로 확인되었다. 하지만 명확한 법적규제가 없는 것과 시공비 절감을 위해 대부분의 공사업자들은 비난연제품으로 시공을 하고 있는 실정이다. 따라서 본 연구에서는 이러한 잘못된 시공으로 인한 위험성을 알리고자 하는데 목적이 있다. 연구방법은 국내에서 생산된 마감용 배관 보온필름 네 종류를 사용하여 화재특성을 분석하였다. 네 종류 중 두 종류는 난연성능이 있는 제품이고 나머지 두 종류는 난연성능이 없는 제품으로 선정하였다. 실험은 제품의 열방출률을 알기위해 콘칼로리미터를 사용하였고 또한 실제 피트 내에 배관보온필름 화재를 묘사하기 위해 45도연소시험기를 사용하여 연소실험을 하였다.

• Fire Science and Engineering
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• v.22 no.5
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• pp.43-47
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• 2008

Recently SIMS has attracted interest as new technique to distinguish the primary and the secondary arc beads. A Cs+ primary ion beam was used to detect the $^{12}C^-$, $^{63}Cu^-$, $^{18}O^-$, $^{35}Cl^-$ secondary ions which are formed during depth profiles in the copper wires. In this work, we studied thermal diffusion in the copper wire which are occurred with supplying over-current. The results demonstrated that Carbon and Chloride are diffused in PVC-coated copper wire deeper than none PVC-coated. However Oxygen showed the reverse diffusion property.

• Fire Science and Engineering
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• v.22 no.5
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• pp.67-71
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• 2008

This experimental study showed the tracking characteristics of contaminated insulating materials of RCD. Electrolytes is made by IEC(International Electrotechnical Commission) 60589, NaCl added to deionized water as each 0.1 wt%. The used test equipment is application to KS(Korean Industrial Standard) C IEC 60112. The used samples is RCD(Residual Current Device) of tree companies. It is investigated carbonic electric conductive pass growth time and tracking growth form that contaminated insulators materials of RCD. As a result, carbonic electric conductive pass growth time and tracking growth form was different each companies. Track growth time of contaminated insulating materials was faster than non-contaminated.

• Fire Science and Engineering
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• v.17 no.3
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• pp.50-54
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• 2003

The backlayer phenomena of smoke in the road tunnel is evaluated through numerical experiments. A commercial code, PHOENICS is used to simulate smoke flow in the road tunnel. The independent and dependent variables are ventilation air velocity and the length of backlayer of smoke respectively. Hybrid scheme and $textsc{k}-\varepsilon$ turbulence model is adopted in the simulation process and mass residual is used as a convergence criterion. The experimental results say that the length of backlayer is reduced linearly with the increase of ventilating air velocity and that there is a critical air velocity which prevents from the onset of backlayering phenomena. One finds that there is a fresh air region near the bottom of tunnel which could make the passenger escape from the region polluted by smoke. These phenomena come from the severe vertical stratification of the smoke air mixture in the tunnel.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2003.04a
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• pp.248-254
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• 2003

According to the analysis of the patient transport in the fire disaster occuring at Taegu Subway Jungangro Station February 18th, 2003, authors concluded as follows. Patients were transported mainly to medical institutes which were larger and that had shorter distance. Because of non-emergenct patient's transport to larger and nearer institutes, some critical patients should be transported to more distant institutes. Dead patients before arrival were transported relatively evenly. An adequate transport according to adequate triage should be performed in the future. Early mitigation and response, correlation with the method of transport, regional guide line of disaster transport and correlation between disaster information and emergency medical information should be corrected and need research in the future.

• Fire Science and Engineering
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• v.21 no.2 s.66
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• pp.98-104
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• 2007

This study is related with the fire risk assessment for fire area at nuclear power plant by use of FDS (Fire Dynamics Simulator) that is a computational fluid dynamics (CFD) model of fire-driven fluid flow. The major purpose of this research is to analyze the sensitivity of the fire modeling when the heat release rate that is an important input variable is changed as well as when the grid size that is a critical factor of the fire model is modified. The result is presented at the conclusion with some comments for CFD model application.

• Fire Science and Engineering
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• v.24 no.2
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• pp.52-57
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• 2010

Power supply to the motor using the emergency power system is being used. However, this system is rarely used except during emergency power is not inefficient. On the other hand, the use of solar power systems Emergency backup power supply as well as in normal maintenance savings, as many have benefits. In this paper, general-purpose simulator PSPICE simulations performed using the PV system to be used in the various models made by the library. In addition, for use as an emergency power generation solar power system design, modeling and analysis of the characteristics and practical use make an effective device was confirmed.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.261-266
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• 2010

본 연구에서는 초고층 건축물에서 피난을 할 때 피난자에게 작용하는 신체 조건과 수직적 이동방향에 따른 피난시간을 분석하였다. 초고층 건축물에서의 피난은 특성상 많은 계단을 통해 이동해야 하므로 피난자는 심리적 행동보다 주로 신체적 능력에 의존하는데, 이 때 피난자의 피로도는 계단수가 올라갈수록 급격히 상승하게 된다. 즉, 총 피난시간은 단순히 피난자의 평지 보행속도에 비례하여 증감할 뿐만 아니라 체력 등의 다른 신체적 영향 또한 받게 된다. 따라서 본 연구에서는 피난자의 신체조건을 고려한 피난예상시간을 산정하기 위해 필요한 조건들을 연구하고자 실물 실험에서의 상 하향의 보행방향과 참가자들의 신체조건에 따른 피난시간을 통계적으로 분석하였다.