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RISS 인기검색어
- 검색키워드
- 저자 : 박원희 ( Woon-hee Park ) (검색결과 6 건)
- 무료
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박원희(Won-Hee Park),김동운(Dong-Woon Kim),이덕희(Duck-Hee Lee),정우성(Woo-Sung Jung),김치훈(Chi-Hun Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Fire spread in a subway passenger coach is investigated using a 1/10 reduced scale model. The dimension of the reduced model saloon is 1.9 m long, 0.290 m high and 0.235 m wide. Only one- sided four doors of the subway passenger car are opened. The n-heptane pool fire with heat release rate 2.33 ㎾ is used as a fire source and Froude number scaling law is adopted. In this scaling law we cannot suitable reappear combustibility of materials in a reduced model so we don't use the very materials of the car. The temperature, heat release rate and mass loss rate are measured to analyze fire development in the coach. The fire spread of the passenger coach in this test is mainly controlled by ventilation through opened doors.
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김종훈,박원희,김운형,명상엽,Kim, Jong-Hoon,Park, Won-Hee,Kim, Woon-Hyung,Myoung, Sang-Yup 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.1
연구목적: 본 연구는 미분무 소화설비의 FDS모델링 수행에 있어 액적과 관련된 변수의 설정 변화가 살수밀도에 미치는 영향을 알아보았다. 연구방법: 미분무 노즐의 살수 현상을 FDS에서 해석할 경우 액적과 관련하여 설정할 수 있는 항목 중 초당액적수, 액적속도, 입경분포함수, 분사패턴형태의 값을 입력하여 분석된 결과를 검토하였다 연구결과: 분석결과에서, 초당미립자 수 설정은 일정 값 이상이 되면 유사한 바닥면의 살수밀도를 보여주었다. 액적속도는 낮아짐에 따라 중심부분의 살수밀도를 높이지만 0.15m 이상 떨어진 거리에서는 낮아짐을 알 수 있었다. 입경분포함수의 변화에 대한 분석에서, 𝛾값의 증가는 중심부분의 살수밀도의 증가를 가져오지만, 떨어진 위치에서의 값은 감소를 가져온다는 점을 알 수 있었다. 가우시안 분포를 적용한 결과에 비하여 균등분포를 적용하는 경우 중앙값은 극적으로 낮아지지만 인접위치에서의 값은 증가함을 보여준다. 결론: FDS의 액적특성에 관련된 변수들은 각각 바닥면의 살수밀도에 영향을 준다. 그러므로 화재 진압이나 냉각 등의 해석에 들어가기 전 신뢰성을 확보하기 위하여 입력변수에 대한 면밀한 검토가 필요하다. Purpose: In this study, the effect of changes in the variables related to water droplets on the spray density on the floor in the analysis of the water mist fire protection system using FDS was analyzed. Method: When the spray of the water mist nozzle was analyzed in FDS, Particles Per Seconds, Particle Velocity, Size Distribution, and Spray Pattern Shape that can be set in relation to droplets were input to review the analyzed results. Result: In the analysis results, when the number of particles per second was set above a certain value, the spray density of the floor was similar. In the case of Particle Velocity, as the velocity decreases, the spray density of the central portion increases but decreases at a distance of 0.15m or more. From the analysis of the change in the size distribution function, it was found that an increase in the 𝛾 value increases the spray density of the central part, but the value at a remote location decreases. Compared to the result of applying the Gaussian distribution, the median value decreases dramatically when the uniform distribution is applied, but the value at the adjacent position increases. Conclusion: Variables related to the droplet properties of the FDS affect the spray density of the floor. Therefore, in order to increase the reliability of results before performing analyses such as fire suppression or cooling, a sufficient review of input variables is required.
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룸코너 설비를 이용한 내장재 교체 전 철도차량의 화재성능 시험
이덕희(Lee Duck-Hee),박원희(Park Woon-Hee),정우성(Jung Woo-Sung),이동찬(Lee Dong-Chan) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
A large-scale fire test was done for interior materials from a vehicle installed within a fire test room. The interior materials are the old style before interior replacement by the Korean guideline for the safety of rail vehicle. Ignition source (gas burner) was increased in several controlled steps. The objectives of this test are to assess the fire performance in terms of ignition and flame spread on interior lining materials and to provide data on an enclosure fires involving train interior materials that grow to flashover. This data will be used to develop and calibrate an Fire Dynamics Simulator (FDS) model for fire growth on the interior vehicle.
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지하철 객차 내 환기 속도가 고압 미세물분무 화재제어 시스템의 성능에 대한 실험평가
김동운(Kim Dong-Woon),배승용(Bae Seung Yong),유홍선(Ryou Hong-Sun),김동석(Kim Dong-Suk),박원희(Park Won-Hee) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This experiments are performed to investigate the effect of ventilation velocity on a high pressure water mist fire suppression in subway train. The experiment is conducted in half scale modeled train of a steel-welled enclosure (8.0m*2.4m*2.1m). The ventilation velocity is controlled by the ventilation duct through an inverter in the range of 0 to 2 m/s. The coverage-radius and an injection angle of an high pressure water mist system are measured. The mist nozzle with 7-injection holes is operated with pressure 80 bar. The heptane pool fires are used. The fire extinguishment times and the temperatures are measured for the ventilation velocities. In conclusion, because the momentum of injected water mist is more dominant than that of ventilation air, the characteristics of water mist, the fire extinguishment times and the temperatures are affected very little by ventilation velocity.
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정보경 ( Bo-kyung Jung ),박원희 ( Woon-hee Park ),김동규 ( Dong-gyu Kim ),최은정 ( Eun-jung Choi ),김연천 ( Yeon-cheon Kim ),황인숙 ( In-sook Hwang ),채영주 ( Young-zoo Chae ) 대한화장품학회 2012 대한화장품학회지 Vol.38 No.1
포름알데히드는 그 자체가 보존제로 또는 다른 보존제로부터 유리된 형태로 화장품에 일반적으로 존재한다. 포름알데히드는 낮은 농도로도 민감한 피부 반응을 일으킬 수 있으므로 화장품에서 그 사용을 규제하고 있다. 본 연구에서는 팩 및 마스크와 같은 화장품 114 품목을 시중에서 구입하여 포름알데히드의 함량을 분석하였다. 검사 품목의 36 %에서 0.3 ~ 9.7 μg/mL (ppm) 수준의 포름알데히드가 검출되었다. 포름알데히드 유리 보존제를 함유한다고 표시되어 있는 12개 제품의 포름알데히드 함량을 조사하였다. Imidazolidinyl urea를 사용한 화장품 10품목과 1,3-Dimethylol-5,5-dimethylhydantoin (DMDM hyantoin)을 사용한 화장품 2품목에서 평균 1.7 μg/mL (ppm)의 포름알데히드가 검출 되었다. 식품의약품안전청 고시 최대 허용 포름알데히드 농도 0.2 % (2,000 ppm)을 고려할 때, 이번 조사에서 분석한 화장품에서는 비교적 낮은 수준의 포름알데히드 함량을 보였다. Formaldehyde is commonly present in cosmetic products as an ingredient intended to preserve cosmetic raw materials or as a liberated product from other formaldehyde-releasing preservatives. Since even low level of formaldehyde can elicit a dermatological reactions in sensitized individuals, there has been a tendency to restrict and regulate the use of formaldehyde in cosmetic products. In this study, we determined formaldehyde content in 114 commercial cosmetic products such as packs and masks. Formaldehyde was detected at the level ranging from 0.3 to 9.7 μg/mL (ppm) in 36 % of the tested cosmetic products. We investigated formaldehyde content of twelve products specifying to contain formaldehyde-releasing preservatives on their labels. In eleven of ten imidazolidinyl urea-containing and two 1,3-Dimethylol-5,5-dimethylhydantoin (DMDM hyantoin)-containing products, average of 1.7 μg/mL (ppm) formaldehyde level was detected. The formaldehyde levels detected in our tested products are low when compared with the maximum authorised concentration 0.2 % (2000 ppm) of formaldehyde in cosmetics according to the Korean Food and Drug Administration notice.
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