• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2011.04a
• /
• pp.100-105
• /
• 2011

본 연구에서는 재실자의 밀도가 높은 지하상가는 공간의 특성상 화재가 발생할 경우 다량의 유독가스의 발생 및 연기의 이동경로와 인간의 피난경로 일치로 인하여 피난안전에 큰 위험성이 있다고 사료된다. 이에 지하철 역사와 연결되어 있는 지하상가를 선정 후, 일본 피난안전성평가수법과 FDS(Fire Dynamic Simulator) 및 SIMULEX를 이용하여 비교 분석을 하였으며, 그 결과, 화재발생 후 6분이 경과 시 위험한 것으로 판단되었다. 그에 대한 대책으로 자연 배연구를 설치하여 시뮬레이션 수행을 한 결과 가시도확보 및 각 출구에서의 온도가 하강하는 것을 확인할 수 있었다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2012.04a
• /
• pp.424-427
• /
• 2012

본 연구에서는 최근 증가하고 있는 대심도역사의 제연팬 용량에 따른 연기확산영향에 대하여 분석하였다. 시뮬레이션모델은 신금호 역사(5호선, 깊이 46m)를 대상으로 하였으며, 제연팬 용량에 따른 연기확산 영향을 분석 하였다. 현장조사 및 실측을 통하여 계측된 실제 역사의 제연팬에 관한 데이터를 화재시뮬레이션 조건으로 적용하였다. 역사전체를 해석 대상으로 하여 총 400만개의 격자를 사용하였으며, 제연팬 용량에 따른 연기확산 영향 비교를 위하여 화재 시나리오를 작성하여 Case별로 화재해석을 수행하였다. 계산 효율을 높이기 위하여 MPI병렬처리기법을 사용하였으며 해석코드는 LES(large eddy simulation) 기법을 주로 사용하는 FDS5 code를 사용하였다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2005.04a
• /
• pp.429-432
• /
• 2005

Geophysical investigations, as a non-invasive method, were conducted at the former gas station site contaminated with fuel hydrocarbons. GPR (Ground Penetrating Radar) survey was performed to locate buried objects such as USTs (Underground Storage Tanks) and fuel pipes which might serve as a origin of the site contamination. Additional GPR investigation and a resistivity survey were conducted to map water table and to characterize shallow geologic structures of the site. The results of the study have shown that seven USTs including one unknown UST and buried fuel pipes are present, and that the groundwater elevation varies with topography from approximately 1.5 to 3m below the surface and the water table is located in the residual soils above the bedrock in the site. The results also show that the geophysical methods can be a very useful tool for the characterization of the contaminated site.

• Proceedings of the SAREK Conference
• /
• 2005.11a
• /
• pp.15-20
• /
• 2005

Recently, IAQ(indoor air quality) is one of the greatest problems in our modern societies. Although research for IAQ is made rapid progress but microorganism concentration is much to be desired. So we have examined a variety of department store, subway station, underground shopping center, kindergartens, library etc. where people complain about the indoor air quality. The microorganism concentration of indoor air was investigated in this study and the average of total microorganisms was measured. The experimental results show that the ministry of Environment recommendation value (800 $CFU/m^3$)is in need of revision in the naer future.

• Proceedings of the KSR Conference
• /
• 2001.05a
• /
• pp.139-146
• /
• 2001

Modern people stay at indoor places about 90% of a day. Radon-222 is a gas produced radioactive decay of the element radium. And, radon is one of the major indoor air pollutants moves into the underground space through various routes and is considered to cause lung c hurting the lung tissues, In this study, we measured the subway radon level at 9 stations o According to test results, we can figure out the concentration of radon by lines, times, and m points. So, it was found that ventilation conditions are the most important factors in the su quality. Finally, we suggested effective and economic management methods of air pollution subway.

• Proceedings of the KSR Conference
• /
• 2006.11b
• /
• pp.1190-1197
• /
• 2006

We have evaluated the structural stability of a platform screen door due to train wind pressure. The platform screen door was installed at the ground and underground station and had 65 meters in length. Also, the platform screen door was a safety device because it was placed between the train and the platform. The finite element analysis was used to calculate the stresses and deflections of platform screen door caused by wind pressure using ANSYS 10.0. Quasi-static analysis was introduced to save calculating time and check quickly structural performances when compared to those of transient analysis. The results show that structural stability of the platform screen door under train wind pressure is proven and quasi-static analysis can quickly check the structural integrity of platform screen door.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2009.04a
• /
• pp.576-581
• /
• 2009

일본의 경우, 반복적인 철도 및 지하공간 역사 화재를 통하여 차량의 불연화(不燃化) 등이 지속적으로 이뤄져 왔다. 피난 기준에 관해서는 2004년 국토교통성 철도국의 발표를 통해 지하철역 등의 피난안전에 관한 검토방법이 발표되었다. 이 규정에 의하여 지하역사의 화재안전성을 검토하는데 화원의 경우 통상화재와 대화원 화재로 구분하며, 발화지점은 차량과 매점으로 나누어 설정하도록 하고 있다. 또한 피난인원에 대한 설정은 3대 도시권과 그 외의 지역으로 구분하고, 행동능력에 따라 3가지 타입으로 분류하여 적용하도록 하고 있다. 본 연구는 일본의 방재규정을 분석하여 장단점을 알아보고 국내 적용가능성에 대한 검토를 수행하였다.

• Journal of the Korean Society of Safety
• /
• v.33 no.6
• /
• pp.123-127
• /
• 2018

Recent catastrophic accidents at the underground subway stations in South Korea have proven that the subway evacuation is an important safety concern. Previous studies have used commercial programs for safety assessment or have been focused on development of computing algorithms rather than the basic analysis data which form the foundation of studies. In this study, we designed a new movement recording apparatus which measured and analyzed crowd movements including but not limited to moving velocity, specific flow rate and crowd density. Moreover, We propose new effective analysis method for evacuation studies with this apparatus.

• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.46 no.4
• /
• pp.28-38
• /
• 2009

In this study, a remote air quality monitoring system for underground spaces was developed by using NDIR-based CO$_2$ sensor. And the remote monitoring system based on wireless sensor networks was installed practically on the subway station platform. More than 6.5 million citizens commutate everyday by the Seoul subway transportation that is the most typical public transportation. They concern about air quality with increasing interest on public health or many workers in subway stations or underground shopping centers. Recently, the Korean Ministry of Environment has operated the air quality monitoring system in some subway stations for testing phase. However, it showed many defects which are large-scale, high-cost and maintenance of precision sensors imported from abroad. Therefore this research includes the reliability test and a theoretical study about the inexpensive commercialized CO$_2$ sensor for reliable measurement of air quality which changes rapidly by the surrounding environments. And then we develop the wireless sensor nodes and the gateway applied for remote air quality monitoring. In addition, web server program was realized to manage air quality in the subway platform. This result will be valuable for a basic research for air quality management in underground spaces for future study.

• Proceedings of the KSR Conference
• /
• 2010.06a
• /
• pp.1982-1990
• /
• 2010

Excepting tunnel of dorimstream - ccachimountain station section, the subway line No.2th section was build using ASSM and NATM methods because of soil pressure and land condition. The way of dealing underground water was selected without sufficient preconsideration of geographical features, ground condition, influence of lowing underground water, and long-term cost of running maintenance so that the form of undrained tunnel was build having decreased construction characteristics and technically improper elements. The form of partial drainage is very difficult to manage structures of tunnel, because water leakage, water pressure causing cracks of lining concretes and scaling are constantly happened. so partial drainage suggest that setting reinforced Anchor Bolt to prevent buoyancy and should increase center drainage way up to height of railroad. Partial drainage suggest that holey pipe(${\phi}$350mm) manhole, drainage checking pipe manhole are should be regularly dredged, when changing roadbed(gravel${\rightarrow}$concrete) drainage checking pipe manhole should be build and setting a limitation of entering underground water's quantities. Beside drainage degree in changed section of structures causing instability of structures is continuous degree. so if efficient drainage way and the patterns of flaws, problems are considered in survey, it will be expected to have a advantage condition in maintenance part.