Dong-Ho Rie

Combustion and thermal properties of paper honeycomb

The honeycomb structure has superior compressive strength so that it is being utilized in various fields. In addition, the paper honeycomb has excellent economic feasibility because of its low production cost and has an environment-friendly advantage because its recycling is possible. Securing of flame retardant performance is essential to use it as interior materials of buildings and fireproof doors using the advantage like this. The present research has evaluated combustion and thermal properties according to flame retardant treatment in terms of two kinds of specimens when flame retardant film is attached to paper honeycomb, and when paper honeycomb is impregnated to flame retardant agents. As a result of evaluating flame retardant performance utilizing a cone calorimeter, the case impregnated into flame retardant agents showed the most superior flame retardant performance. Through this result, it was confirmed that the paper honeycomb can be utilized as interior materials of buildings though improvement of flame retardant performance.

A Study on Fire Extinguishing Performance Evaluation of Compressed Air Foam System

This research is to evaluate the fire extinguishing performance of Compressed Air Foam System and this test was conducted using Foam Head System. Compressed Air Foam System adopt the methods of causing the foam by mixing compressed air in foam-aqueous solution, In Overseas, CAFS (Compressed Air Foam System) is generally used because long distance discharge is possible and the water damage can be minimized by reducing the water usage. In this study, Comparative analysis on fire extinguishing effect is done through test to compare the performance between Foam System applied existing air mixture method and Compressed Air Foam System applied AFFF 3 %, foam-extinguishing-agent based on UL162 standard. In Compressed Air Foam System, the volume proportion of air mixture to foam-aqueous solution is 1 to 1 and discharging flow rate is 140 L/min, 160 L/min, 180 L/min, 200 L/min each. As a result of the test, in terms of fire extinguishing performance, fire suppression time for Compressed Air Foam Systems is shorter than for General Air Mixture System in all flow conditions.

A Study for Characteristics of Water that Penetrates Wood Flour due to Changes of Concentration of BDG

As the feature of fire, it is hard for deep-seated fire to spread to the deeper site, and it also has danger for being re-ignited cause of recontacting with oxygen after being put off. Now it is ruled in the certification criteria of wetting agent used for extinguishing deep-seated fire that the criteria for surface tension is below 33[mN/m] in Korea. For figuring out how much water for fire-fighiting can permeate into combustibles, in this research, the permeating performance is analyzed by measuring the speed of permeating and transmission quantity released after that, by pouring solution whose surface tension is changed by adjusting concentration of surfactant BDG(Butyl Di Glycol) in column From this result, it is can be determined that transmission quantity becomes less and wet area goes wider as surface tension is lower, and it is also able to be analyzed as quantity of absorbed liquid and wet area is increased because fluid permeates into the core

Characteristics study on fire-resistant paint used by TGA-IR

The iron frame of building could be collapsed or bent at . Therefore the fire-resistant paint should be applied for safety. This study performed the comparative analysis to show the characteristics of fireresistant paint. And then 12 products of fire resistant paint and 6 products of paints were used as samples. And the samples were analyzed by TGA (Thermogravimetric Analyzer) as analyzer for measuring the variation of weight on temper of weight by heating. When TGA analyzer could measure the variatiature, and FT-IR was measured for analyze gas components on variation on of weight by heating on 12 products of fire resistance, the samples showed to decrease 40% of weight to , and because paints had 50% to 40% of loss weight, it showed to be equal with loss weight of fire resistance paint on high temperature or was lower loss weight than it of fire resistance paints. However number 6 sample of fire resistance paints could show to decrease 20% of total weight on . And then in the case of FT-IR, fire resistance paints could show to have the high intensity of spectrum as complete combustion. However paints could show to have the lower intensity of spectrum, have the higher intensity of water spectrum. Therefore the TGA graph of result could be much different until . When it was burned, FT-IR spectrum could show to confirm the characteristics of fire resistance paints, and the characteristic could be confirmed on inorganic paint of fire resistance by weight loss of TGA.

The study on interval calculation of cross passage in undersea tunnel by quantitative risk assesment method

Quantitative Mokpo-Jeju undersea tunnel is currently on the basis plan for reviewing validation. As for the cross section shape for express boat of 105 km line, sing track two tube is being reviewed as the Euro tunnel equipped with service tunnel. Also, 10 carriage trains have been planned to operate 76 times for one way a day. So, in this study, quantitative risk assessment method is settled, which is intended to review the optimal space between evacuation connection hall of tunnel by quantitative risk analysis method. In addition to this, optimal evacuation connection hall space is calculated by the types of cross section, which are Type 3 (double track single tube), Type 1 (sing track two tube), and Type 2 (separating double track on tube with partition). As a result, cross section of Type 2 is most efficient for securing evacuation safety, and the evacuation connection space is required for 350 m in Type 1, 400 m in Type 2, and 1,500 m in Type3 to satisfy current domestic social risk assessment standard.

A Research of Risk Assessment for Urethane Fire Based on Fire Toxicity

Fire in the risk management subject belongs to high risk disaster which accompanies personnel and materiel loss. So, management of disaster and safety is required to include fire prevention activities, fire risk prediction and investment of safety management expense. Combustion toxicity is required by gas toxicity test (KS F 2271), to minimize human damage. In this study, gas toxicity test were experimented with regard to urethane sample (Depth 5~25 mm) to obtain basic data. Fire effluent exposing to experimental animal were analyzed by FT-IR (Fourier transform infrared spectroscopy). Combustion toxicity index Lethal Fractional Effective Dose (L ) of ISO 13344 was calculated. According to the result of calculating Lethal Concentration 50% (LC ) based on L , LC of urethane sample containing certain level of fire load is confirmed as 118~129 g/m . Through this study, applicability of this method was confirmed for fire risk assessment. This method can provide information to predict human damage by toxicity combustion gas for securing safety.

A comparative Study for dispersion model in evacuation plan by using MAS-based evacuation simulation

Smoke is one of the most critical factor when escaping from the fire since it reduces visibility and interrupts finding emergency exit lights. Therefore, it is recommended that an evacuation simulation program should incorporate the smoke factor. In addition, it is suggested that the program should include not only the unilateral damage by the smoke but also the detour evacuation by risk communication. In this study, MAS (Multi Agent System)-based simulation program which incorporates the reduced walking speed by smoke and adopts the dispersion evacuation logic during escaping from the fire. To make comparison, a commercial evacuation program, Pathfinder was used. It was found that the simulation results of MAS (Multi Agent System)-based program is better than Pathfinder in terms of safe evacuation. It means that evacuation simulation need a additional evaluation categories that include not only quick evacuation time but also safe evacuee number.

Validity Analysis of Scale Model Experiment for Wetting Agent Performance Evaluation

현재 국내의 침윤소화약제 기술기준은 표면장력에 대한 기준만 존재하여 이를 통한 약제의 성능평가는 어려운 실정이다. 따라서 침윤소화약제의 성능평가 기법을 제시하기 위해 축소모형 실험 장치를 통한 최적화된 성능평가 방법을 제시하고자 한다. 본 연구는 해외 기준인 NFPA 18의 실험과 자체 제작된 축소모형 실험 장치를 이용한 실험의 결과 비교분석을 통해 자체 제작 축소모형 실험 장치실험 결과의 타당성을 규명하고자 한다. 목화솜을 대상으로 침투성능만을 평가하는 NFPA 18 실험과 목분을 대상으로 침투성능과 소화성능을 모두 평가하는 축소모형 실험을 비교분석한 결과NFPA 18의 실험과 자체 제작 축소모형 실험에서 모두 소화용수의 침투성에 관한 변별력을 확인할 수 있었다. 또한 자체 제작 축소모형 실험에서는 T/C를 통한 내부온도 측정을 통해 보다 명확한 변별력을 나타냄을 확인하였다.ABSTRACTA current standard exist only on the surface tension in the current domestic wetting agent technology standards, so it isdifficult to the performance evaluation of the wetting agent through the standard. So this study presents the optimized per-formance evaluation methods by scale model experimental equipment in order to present techniques for performance eval-uation of wetting agents. The purpose of this study is to investigate validity of experimental results of the self-designedscale model experiment equipment by a comparative analysis of experimental results of the NFPA 18 experiment and theexperiment using the self-designed scale model experiment equipment. As a result of a comparative analysis of experi-mental results of the NFPA 18 experiment that evaluate only the permeation performance on the contton and the experi-ment using the self-designed scale model experiment equipment that evaluate the permeation performance and fireextinguishing performance on wood flour, the discrimination of the permeation performance was confirmed in both theNFPA 18 experiment and the self-designed scale model experiment equipment. And a result of self-designed experimentequipment have clear discriminatory more than NFPA 18 by internal temperature measurement using the thermocouples.Keywords : Deep-seated fire, Wetting agent, NFPA 18, Self-designed experiment equipment, Scale model

Wetting Agent Performance Evaluation Using Scale Model

본 연구는 자체제작 축소모형 실험 장치를 이용하여 목재를 대상으로 침윤소화약제의 소화성능평가를 수행하였다. 축소모형실험의 최적조건 확인을 위해 소화용수의 양과 목재의 수를 변화시켜 조건설정 실험을 진행한 결과 20 pieces의목재를 적층한 후 물과 소화용수 100 mL를 살수한 경우에 한하여 소화성능의 변별력을 확인하였다. 따라서 해당 조건에서 현재 사용되고 있는 국내외 침윤소화약제를 대상으로 소화성능을 평가한 결과, 물의 경우에서만 재 발화가 발생하는것을 확인하였다. 또한 살수 시간에 따른 온도분포를 통해 소화능력의 변별력을 판단할 수 있었다. 본 실험 결과를 바탕으로 추후 최적화 침윤소화약제 성능평가 방법을 제시하는데 기초자료로 활용할 수 있을 것으로 판단된다.ABSTRACTIn this study, the extinguishing performance evaluation of wetting agent for wood crib was conducted by using a scalemodel equipment that we designed. To confirm the optimal conditions of the experiment, a test was changed amount offire extinguishing water and the number of timber. As a result, the discrimination of the fire extinguishing performancewas seen only when 20 pieces of wood and the extinguishing water of 100 mL were used. After evaluating the extinguish-ing performance of domestic and foreign wetting extinguishing agents under these conditions, a reignition was occurred inonly when we used water. In addition, the discrimination of extinguishing performance was seen through the temperaturedistribution according to the time of watering. Based on the results of this experiment, this study is expected to be able touse as a basis on presenting a method of optimized performance evaluation of wetting extinguishing agent.Keywords : Deep-seated fire, Wetting agent, Self-designed experiment equipment, Scale model, Wood crib

A Research of Grain Size Analysis of Particulate Matter in Fire Effluent

Interior finishing materials using noncombustible were regulated by the building codes to prevent the spread of fire and protect occupants. The average deed of stopping time of experimental mouse exposing combustion gas were measured by KS F 2271 gas toxicity test. At that time, The average deed of stopping time under 9 minutes were judged a inconsistence. This experiment method has limit to find out a cause of toxicity effect factor. In this study, particle size analysis were performed for investigate a major factor.