A5050710389- Fire dynamics and safety research
- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Combustion and Detonation Processes
- Evacuation and Crowd Dynamics
- Fire Detection and Safety Systems
- Education, Safety, and Science Studies
- Radiative Heat Transfer Studies
- Flame retardant materials and properties
- Fire effects on ecosystems
- Catalytic Processes in Materials Science
- Wind and Air Flow Studies
- Marine and Coastal Research
- Thermal and Kinetic Analysis
- Risk and Safety Analysis
- Vehicle emissions and performance
- Computational Fluid Dynamics and Aerodynamics
- Engineering Applied Research
- Atmospheric chemistry and aerosols
- Heat transfer and supercritical fluids
- Welding Techniques and Residual Stresses
- Thermochemical Biomass Conversion Processes
- Atmospheric aerosols and clouds
- Fluid Dynamics and Turbulent Flows
- Rocket and propulsion systems research
Daejeon University
2012-2024
Pukyong National University
2020-2023
Hanbat National University
2022
Incheon National University
2020
New York City Fire Department
2019
Kyungpook National University
2019
Korea Research Institute of Standards and Science
2014
Korea Institute of Nuclear Safety
2013
National Institute of Standards and Technology
2008-2010
Inha University
2003-2010
Photoelectric smoke detectors are used for early detection of building fires, and sensitivity adjustment is generally performed using white generated by the burning filter paper. Therefore, when black same concentration introduced, detector often not activated. To address this problem, differences in distribution light scattered various colors were analyzed. A light-scattering chamber with a light-receiving unit scattering angles was constructed to measure inside detector. The measured from...
An experimental study was conducted to investigate the thermal, chemical, and flow environments of heptane fires in an ISO 9705 room. Fuel rates vent size were manipulated create overventilated fire (OVF) underventilated (UVF) conditions. Numerical simulations also performed, for same conditions, with Fire Dynamics Simulator (FDS) developed at National Institute Standards Technology. Both OVF UVF conditions characterized temperature distributions, combustion product formation measured...
An experimental study was conducted to investigate the effects of fuel location and distribution on full-scale underventilated compartment fires in an ISO 9705 room. Heptane burned three different distributions: single centered burner (SCB), rear (SRB), two distributed (TDB). It experimentally observed that variations placement did not significantly affect global steady state fire characteristics such as mass loss rate, heat release combustion efficiency, equivalence ratio, CO emission...
The electronic properties of graphene can be significantly influenced by mechanical strain. One practical approach to induce strain in is transfer this atomically thin membrane onto pre-patterned substrates with specific corrugation. possibility use nanoparticles impart extrinsic rippling has not been fully explored yet. Here we study the structure and elastic grown chemical vapour deposition transferred a continuous layer SiO2 diameters around 25 nm, prepared on Si substrate...
The NOx emission characteristics of dimethyl ether (DME) in laminar co-axial jet and counterflow non-premixed flames were investigated using experimental numerical approaches, respectively. flame structure emissions DME compared to those C2H6, which has equivalent methyl structures but lacks an oxygen atom. Experimental results showed that, the case, combustion had a partial premixed flame. Additionally, it shorter lower C2H6 It is thus concluded that major cause low from may be short length...
성능위주 소방설계(PBD)의 과정에서 요구피난시간(RSET) 산정의 신뢰성을 확보하기 위해서는 화재시뮬레이션을이용한 정확한 연기감지기 작동시간 예측이 필수적이다. 본 연구의 목적은 FDS 기반의 수치모델에서 요구되는 입력인자의 정확도를 개선시키는 것이다. 이를 위하여 선행연구에서 적용된 화재감지기 시험장치(FDE)의 개선이 이루어졌다. 구체적으로 FDE 내부의 유동 및 연기농도 균일성이 개선되었으며, 연기입자의 전방산란 저감을통해 감지기가 작동되는 순간의 광 소멸률이 측정되었다. 개선된 FDE를 이용한 입력인자는 기존 결과와 정량적으로 상당한 변화를 보이고 있으며, 이온화식 감지기에 비해 광전식 감지기에서 더 큰 차이가 확인되었다. 연기감지기의 작동조건은 감지기 종류, 가연물, 연기입자 색상에 따라 발생됨을 고려할 때, PBD의 향상시키기 향후 연구에서는 보다 다양한 가연물에 대한 입력인자 DB가 구축되어야 할 것이다.Accurate predictions of the...
The obscuration thresholds for various smoke detectors and combustibles, required as an input parameter in fire simulation, were measured to predict the accurate activation time of detectors. One ionization detector nine photoelectric selected. A evaluator, which can uniformly control velocity concentration, was utilized. Filter paper, liquid fuels, polymer pellets employed smoke-generation combustibles. nominal considered 15 %/m, but activated at approximately 40 %/m 16 respectively, on...
Two welding methods of FCAW (Flux-cored arc welding) + FCAW, and GTAW (Gas tungsten were compared to identify effective routes for STS 316L/A516-70N clad stainless steel. Since the speed method is slower than that method, amount heat input large, size heat-affected zone formed larger, angular deformation also large. The microstructure specimens investigated by computational simulation, results with calculated actual specimens. very similar, thus confirming high accuracy calculation. After...
Consideration of appropriate fire scenarios in the simulations Fire Dynamics Simulator (FDS) for fire-risk assessment buildings is a critical factor development prevention and response measures. The user dependence FDS input parameters can threaten reliability assessment. An experimental study was conducted to establish correlations considering using polymethyl methacrylate. To examine changes maximum-heat-release rates (HRRs) according combustion environment, nine burners varying size at 25...
In South Korea, the need to link fire and evacuation simulations compare available safety egress time (ASET) required (RSET) in real when implementing performance-based design buildings is increasing. Accordingly, Consolidated Model of Fire Growth Smoke Transport (CFAST) has been discussed as an alternative dynamics simulator, which requires high computational costs, sufficient experience numerical calculations, various input parameters faces limitations integration with simulations. A...
The majority of fatalities in building fires are attributed to asphyxiation caused by toxic gases. Hydrogen cyanide (HCN) is one the gases that can be released during a fire, posing lethal risk humans even at low concentrations. However, analysis posed HCN fire assessments using simulations relatively rare. This study conducted examine potential risks occupants fire. considered various conditions residential buildings varying fuel types, growth rates, and yields. relative score (RRS) was...
국내 PBD에서 화재시뮬레이션을 이용한 안전성 평가의 신뢰성을 개선시키기 위하여, 화재시뮬레이션의 입력변수 및 수치모델의 불확실도가 고려된 ASET의 평가방법에 대한 검토가 수행되었다. 이를 위해 영화관 오피스텔이 검토 대상으로 선정되었다. 주요 결과는 다음과 같다. 인명안전기준에 제시된 물리량에 가장 큰 영향을 미치는 열발생률의 불확실도를 고려할 때, 온도, CO 가시도의 상당한 변화가 발생됨을 확인하였다. 또한 불 확실도를 반영한 편향인자를 온도 CO는 없으나 FDS의 낮은 연기농도 예측성능으로 인하여 가시도는 크게 증가됨을 알 수 있었다. 마지막으로 ASET이 대부분 가시도에 의해 결정되는 원인이 논의되었으며, 정확한 ASET 평가를 불확실도 적용 방안이 제안되었다.To improve the reliability of a safety assessment using fire simulation in domestic PBD, evaluation method...
성능위주 소방설계(PBD)의 과정에서 화재 및 피난모델링의 신뢰성을 확보하기 위해서는 화재감지기 모델의 높은 예측성능이 필수적으로 요구된다. 본 연구의 목적은 FDS와 같은 대와동모사(Large Eddy Simulation) 화재모델에 적용될 수 있는 연기감지기의 정확한 작동 개시시간을 예측하기 위한 수치적 입력정보를 측정하는 것이다. 이를 위해 화재감지기의 장치특성을 측정할 FDE (Fire Detector Evaluator)를 제작하였으며, 이온화식 연기감지기에 대한 Heskestad Cleary 입력변수가 측정되었다. 또한 일반적으로 사용되는 FDS의 기본 값과 측정된 값이 적용된 정량적으로 비교하였다. 주요 결과로써, 연구에서 검토된 장치 물성은 FDS에 매우 큰 차이를 보이고 있으며, 연기감지기 개시시간이 최대 15분 이상 차이가 발생되었다. PBD의 향상시키기 위하여 향후 연구에서는 보다 다양한 연기 열감지기의 장치물성에 데이터베이스(DB)가 구축될 예정이다....