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박경환,소수현,윤명오,Park,Kyung-Hwan,So,Soo-Hyun,Yoon,Myung-Oh 한국방재학회 2011 한국방재학회논문집 Vol.11 No.5
고층건물에서 연기가 승강로와 계단을 통해 건물 전체로 확산되는 것을 방지하기 위해서 계단실 가압과 승강로 가압을 사용한다. 특별피난계단 부속실과 비상용승강기 승강장을 겸하는 아파트 건물에서 계단실 가압과 승강로 가압시험을 실시하였다. 승강기 가압시험에서 모든 문이 닫힌 상태에서 50 Pa의 기준 차압을 유지하는데 필요한 공기량은 150 CMM이었다. 승강기 문이 1개 개방되었을 때에는 세대 문에 평균 풍속이 0.75 m/s 기준값을 초과하였고, 비개방층에서도 10 Pa 이상의 압력차를 유지하였다. 반면 계단실 가압의 경우에는 180과 360 CMM으로 급기를 하여도 저층부의 문이 개방되면 비개방층에서 10 Pa의 압력을 유지할 수 없었다. 고층부가 개방되는 경우에는 비개방층에서 10 Pa의 차압을 형성하였지만 저층부에서는 과압이 발생하였다. 따라서 두 가지 제연방식을 비교한 결과, 고층 건축물에서는 승강로 가압이 계단실 가압에 비해 성능이 우수한 것으로 판단되었다. Pressurization of stair and elevator shaft is used to prevent the diffusion of smoke over the whole building through the elevator shaft and stair in high rise building. At the apartment which combines the vestibule of a special evacuation stair and the platform of an emergency elevator, the pressurization test of stairway and elevator shaft was carried out. At the elevator pressurization test, the amount of air was 150 CMM, which was necessary to sustain the pressure difference of the standard, 50 Pa, at the condition of all closed doors. When an elevator door was opened, the average velocity went beyond the standard value, 0.75 m/s, at the swelling door and kept the pressure difference of 10 Pa was sustained at the non-opened floor. On the other hand, in the case of the pressurization of stairway, when a low-floor door was opened, the pressure difference of 10 Pa could not be kept at the closed floor even though the amount of air of 180 and 360 CMM was supplied. When a high-floor door was opened, the pressure difference of 10 Pa was made at the non-opened floor, but the overpressure was caused at the low-floor. Therefore, the comparision result of two methods of smoke control showed that the pressurization of elevator shaft have better performance than that of the pressurization of stairway.
정량적 위험성 평가를 활용한 도로터널 화재시 물분무 소화설비의 피난 안전 효과 연구
박경환,유지오,Park, Kyung-Hwan,Yoo, Ji-Oh 한국터널지하공간학회 2012 한국터널지하공간학회논문집 Vol.14 No.1
본 논문은 도로터널에 설치하는 물분무소화설비가 피난성능을 개선시키는지를 검증하는 연구이다. 검증의 절차와 방법은 '도로터널 방재시설 설치 및 관리지침'에 따라 수행되었다. 3종류의 화재크기와 27개의 화재시나리오에 대한 화재 평가와 피난 평가를 실시하였다. 결과는 물분무소화설비가 설치된 경우와 설치되지 않은 경우로 구분하여 제시하였다. 물분무소화설비는 27개 시나리오 중에서 26개에서 물분무소화설비가 없는 경우에 비해 사망자가 감소하였다. 물분무소화 설비가 설치되지 않은 경우의 사회적 위험도는 홍콩과 네델란드 기준에서는 수용할 수 없는 범위였다. 반면 물분무소화설비가 있는 경우에는 사회적위험도가 ALARP 범위였다. 결과적으로 물분무소화설비가 있는 경우에는 없는 경우와 비교해서 1명, 10명, 100명 이상의 사망 빈도가 각각 50배, 100배 및 4배로 감소하였다. 결과적으로 물분무소화설비는 도로터널 화재 시 고온기류의 냉각작용과 독성가스의 세척효과를 통해 피난에 유리한 환경을 조성한다는 것을 확인하였다. This paper tried to verify whether the fixed fire fighting system (FFFS) that is installed in road tunnel improves evacuation performance or not. Verification was performed according to the Disaster Prevention Facilities Installation and Management Guide at Road Tunnel. Twenty seven different fire scenarios were set up for the verification and the cases that FFFS was installed were compared with the cases that FFFS was not installed. The result of the comparison showed that the average equivalent death was reduced in 26 cases out of 27 cases when water spray extinguishing system was installed. It was confirmed that the risk when was not installed was unacceptable in Hong Kong and the Netherlands. On the other hand, it was confirmed that the risk was reduced to as low as reasonably practicable (ALARP) when was installed. The cumulative frequency of average death in case with FFFS was compared against the frequency of death without FFFS: death of one or more is about 50 times less; 10 or more is about 100 times less; and the death of more than 100 is four times less. It was verified that FFFS makes improved conditions to escape from the fires in road tunnel.
박경환,소수현,Park, Kyung-Hwan,So, Soo-Hyun 한국터널지하공간학회 2010 한국터널지하공간학회논문집 Vol.12 No.4
터널화재 시 위험을 경감시키기 위해 설치하는 물분무설비의 성능을 실대 시험을 통해 확인하였다. A급 화재, Pool 화재 및 차량화재시 물분무노즐은 뜨거운 연기의 온도를 낮추는데 효과가 큰 것으로 확인되었다. 또한 터널에 기류가 존재하는 경우에도 냉각효과가 큰 것으로 확인되었다. 이 결과를 통해 물분무설비는 터널화재 시 기류온도를 낮춤으로써 fire jump를 방지하고, 주위의 시설물을 보호할 수 있을 것으로 판단된다. The performance of water spray system installed to reduce risks of tunnel fire is investigated by a real tunnel fire test. In case of A class fire, Pool fire, and car fire, the nozzle of water spray has had a marvelous effect to reduce the temperature of hot smoke. And it is verified to have remarkable cooling effects when there is the air flow in a tunnel. Though this results, water spray system will be able to prevent a fire jump to decrease the air temperature in a tunnel and to protect tunnel facilities by the fire control.
삼비탕(三痺湯)이 XO/HX에 의해 손상(損傷)된 골아세포(骨芽細胞)에 미치는 효과(效果)
박경환 ( Kyung-hwan Park ),이영석 ( Young-suck Lee ),강솔 ( Sol Kang ),조한백 ( Han-baek Cho ),김종환 ( Jong-hwan Kim ),유심근 ( Sim-keun Yoo ),홍기철 ( Ki-cheul Hong ) 대한한방부인과학회 2001 大韓韓方婦人科學會誌 Vol.14 No.3
To evaluate the effect of Sambitang(SBT) water extract on cultured osteoblast inhibited by xanthine oxidase(XO) and hypoxanthine(HX)- induced oxygen radicals, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) assay, Neutral red(NR) assay, thiobarbituric acid reactive substances(TBARS) assay and Lactate Dehydrogenase(LDH) activity assay were carried out after the cultured osteoblast were preincubated with various concentrations of SBT water extract for 3 hours prior to exposure of XO/HX. The results obtained were as follows: 1. XO/HX decreased the survival rate of the cultured osteoblast on NR assay and MTT assay. 2. SBT water extract have efficacy of decreasing lipid peroxidation. 3. SBT water extract have efficacy of increasing LDH activity. From above the results, It is concluded that SBT has marked efficacy as a treatment for the damages caused in the XO/HX-mediated oxidative process.