• Journal of the Korean Society for Railway
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• v.10 no.5
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• pp.506-510
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• 2007

Smoke temperature and volume flow rate in a tunnel fire are calculated. To obtain realistic results, enthalpy of smoke which composites combustion gases and entrainment air is calculated from curvefit polynomials by temperature. A user-friendly computer program for them is also developed. This program might be used for a good engineering tool in design of fire safety and mock/reduced-scale fire tests in a tunnel.

• Proceedings of the Korea Society for Simulation Conference
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• 2004.05a
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• pp.83-88
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• 2004

본 논문은 제품에 대한 비용 지불에 있어서 시간의 지연이 허용될 때 발생할 수 있는 기회비용과 그 지연에 따른 이자의 상충관계를 통해서 얻을 수 있는 이익에 관해 비용에 대해 다루었다. 여기에서 Continuous review를 고려한 (S, s)정책을 기본 가정으로 하여 주문량의 변동이 있을 수 있는 상황을 고려한다. 이러한 모델에서는 이 비용 계산의 연기 기간에 따라서 비용과 주문량의 민감한 변화를 보인다. 실제로 예를 통해 지불연기 허용에 따라서 재고 시스템 내에서 발생하는 비용의 감소와 주문량의 증가를 볼 수 있다. 또한 지불연기 기간을 허용한 경우와 그렇지 않은 경우의 비용 간 비교를 통해 구매자 입장에서 이윤을 가져올 수 있는 최소한의 지불연기 기간을 도출할 수 있다.

• Journal of the Korean Institute of Gas
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• v.17 no.1
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• pp.35-41
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• 2013

In this study, flame retardancy of polyurethane foam and phenolic foam were investigated by addition of phosphorous flame retardants. The thermal degradation behavior of polyurethane foam and phenolic foam in the presence of flame retardants has been studied by thermogravimetric analysis(TGA). Heat release rate(HRR), mean HRR, mass loss rate(MLR), total smoke released(TSR) and limited oxygen index(LOI) were tested by cone calorimeter. From the test results, Phenolic foam showed low HRR, MLR and TSR than polyurethane foam.

• Fire Science and Engineering
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• v.25 no.3
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• pp.119-124
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• 2011

In this study, we measured the smoke density characteristics to find the fire risk of Wood-Plastic composites (WPCs) which are one of spotlighting materials for landscape architecture and residential construction material with the cone calorimeter tester (by ISO 5660-2) and the smoke density tester (by ASTM E 662). In addition, the identical test was implemented to compare the smoke density characteristics between the red pine and the antiseptic wood. The result of cone calorimeter test showed that emissions of carbon monoxide, carbon dioxide and total smoke production rate of WPCs were higher than those of red pine and antiseptic wood. And the result of smoke density test showed that maximum specific optical smoke density(Dm) of WPCs was higher than that of red pine and antiseptic wood as well.

• Fire Science and Engineering
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• v.19 no.1 s.57
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• pp.70-89
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• 2005

Fire scenarios in a space $20.0m\;\times\;4.0m$ floor and 3.0m high were simulated by using computational fluid dynamics program (FDS 4.0.3) to investigate the effect of the combined operation of both sprinkler and vent systems, which are installed for cooling and blocking smoke which propagates beneath the ceiling of a horizontal corridor, on the temperature and smoke density of it. It was shown that the combined operation both sprinkler and vent systems was more effective than each operation for cooling and blocking smoke, the number of operating sprinklers was two because of corner effect of wall, and over-installed sprinklers deteriorated the effect of cooling and blocking smoke. This study showed that the case of two sprinklers and vent flow rate $3.0m^3/s$ in fire scenario was the most effective for cooling and blocking smoke. It was confirmed that the smoke downdrag occurs in operating sprinkler system, and the more smoke droplets produced by increasing fire size, the greater smoke downdrag occurred.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.11a
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• pp.236-237
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• 2013

The fire safety design of performance is fire behavior inside buildings must be scientifically described and systemized as a theory, thereby allowing application to fire safety design of buildings. In this study, experiment of fire behavior according to disposition of combustibles were performed for correlation analysis between flashover and smoke production rate in building structure. As a result, smoke production rates is happened more than 80 m2/s in compartment(ISO 9705). Also, even if the fire load for flashover to if occur smoke did not, which confirmed that the delay time of occurrence.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.389-392
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• 2012

연기감지기는 이온전류의 변화량을 감지하는 이온화식 연기감지기와 발광부와 수광부로 이루어진 챔버내에 연기에 의한 광량의 변화를 감지하는 광전식 연기감지기로 구분된다. 국내에서는 광전식 연기감지기가 더 많이 사용되고 있는데 이러한 광전식 연기감지기의 챔버내에 이물질이 침입하게 되면 비화재보를 발생시키게 된다. 본 논문은 연기감지기의 연기감지 챔버에 대한 비화재보를 감소시키기 위한 신뢰성 시험에 대하여 논한 연구이다. 광전식 연기감지기의 신뢰성을 검증하는 방법으로는 먼지에 대한 신뢰성을 검증하는 가연물 종류에 따른 연기감지 신뢰성 시험이나 분진시험이 적합한 것으로 판단되며, 이러한 시험의 반복을 통하여 광전식 연기감지기의 신뢰성을 검증하는 것이 필요한 것으로 사료된다.

• Fire Science and Engineering
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• v.24 no.3
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• pp.58-65
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• 2010

The fire accidents having recently occurred are getting more and more larger and causing lots of damage in terms of property loss and casualties increase, so there is in need of technical fire safety development like comprehensive prevention solution in order to effectively prevent. Especially, the needing of new paradigm for advanced fire safe technology is gathering strength in high-rise modern building construction. Therefore, we want to find out on this paper what is a correlation between heat release rate measurement and smoke release volume by three parts of oxygen consumption calorimeter in bench scale calorimeter (cone calorimeter/ISO 5660/Avg.500Kw), Medium scale calorimeter (Room corner tester, Single burning Item/ISO 9750, EN 13823/Avg.3MW), and large scale calorimeter (Industry calorimeter/Avg. 10MW). Thus, Smoke detective of new paradigm devised by making use of a correlation between heat release and smoke production is to help reduce loss property and casualties. Ultimately, based on this theory, a new concept of fire alarm and evacuation system will be developed and expected to apply to a skyscraper.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2008.04a
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• pp.303-307
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• 2008

In this study, we have carried out the cone calorimeter test to examine the thermal characteristics, such as total smoke production(TSP), smoke temperature and oxygen consumption, of significant parts of above trees which are representative species of Young Dong Province of Korea. The smoke production of dead leaves and living leaves of pinus densiflora was increased rapidly at the early period of combustion. So the total smoke production of this parts was 8.3 times higher than other parts. The TSP of branches and barks of quercus dentata was 14.4 and 7.2 times higher than of pinus densiflora respectively. And also the maximum smoke temperature was about $338.35{\sim}353.25\;K$. The significant difference of oxygen consumption was not detected for dead leaves, branches and barks. However, the oxygen consumption of living leaves which have high percentage of moisture content is the lowest.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2000.06a
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• pp.144-149
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• 2000

최근에 국내에서도 대형 쇼핑 몰이나 건축물에 부속된 아트리움 등 대형공간을 도입한 건축물이 점차 증가하고 있다. 따라서 건물 방화 설계자는 화재시 공간의 특성에 따른 열과 연기의 확산과 이동에 관한 정량적인 해석이 필요하지만 국내에서는 아직 이에 대한 관련 규정이 미비한 실정이다. 대형 공간의 공학적인 해석은 크게 실험을 통하여 제시되는 계산공식을 이용하거나 대상 공간의 화재 조건을 예측하는 컴퓨터 모델을 이용할 수 있다. 외국의 경우, 미국의 NFPA 92B는 이러한 공간에 대한 제연 시스템에 적용하는 공식과 계산식을 제시하고 있으며 이를 통하여 연기나 열 감지기의 작동시간, 연기 발생비율, 연기 층의 하강을 제어하기 위한 배기량 등을 계산할 수 있다. (중략)