• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.577-583
• /
• 2007

In railway business plan, operations require a strategic and sustained level of planned investment to ensure assets are fit for purpose over the whole of their planned life. Therefore it is essential that operator can confidently plan and predict capital investment requirements over a number of years. This research addresses that how the London Underground apply a systematic risk based approach to their health and safety planning and investment decision making. Through this case study, we investigate the elements of management system that includes arrangements for the ongoing identification of hazards, assessment of risks and the implementation necessary control measures. Risk based business planning processes are also addressed.

• Journal of the Korean Society of Safety
• /
• v.21 no.6 s.78
• /
• pp.1-6
• /
• 2006

Subway platform is divided into Side-platform type and Center-platform type. In this study does quantitative fire risk assesment of subway platform types in numerical analysis by using CFD model. From the result of this study, 1) All exhaust mode was low-end result it seems most fire risk at Side-platform station. 2) All exhaust mode was low-end result it seems most fire risk at Center-Platform station. 3) When comparing same type exhaust mode of Side-platform and Center-platform that last thing was visible $9.1{\sim}72.34%$ low-end fire risk. Center-platform is more opera-tive than Side-platform that reduce fire risk when that was same dimension and external environment. Designer look upon a fire characteristic of subway platform types when he make smoke control air volume and platform area design.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2011.11a
• /
• pp.61-66
• /
• 2011

부압식 스프링클러 설비는 우리나라에서 일반적으로 사용되고 있는 준비작동식이나 건식 또는 습식 스프링클러 설비의 2차측 배관내의 압력을 부압(진공)상태로 유지시켜 오작동(스프링클러 헤드의 파손 또는 배관의 누수) 시에 발생되는 소화수의 누수를 진공압(-0.05~-0.08MPa)으로 흡입하는 구조로 설계되어 수손피해에 대한 위험도를 제거 하여 기존의 스프링클러 시스템의 문제점을 해결 할 수 있는 획기적인 기술로 볼 수 있다. 또한 부압식 스프링클러 설비는 습식, 준비작동식에 해당하는 시설에 모두 적용이 가능하며 매년 국내, 외에서 건설되는 모든 대상물에도 설치가 가능하며 기존 설비된 건물에도 손쉽게 적용이 가능하여 앞으로 IT관련 산업, 반도체 제조공장, 호텔, 학교, 병원, 관공서, 지하철 역사, 정밀가공 제조설비 등 특히 내진설계에 적용되고 있는바 그 적용성이 무궁무진한바 본 부압식 스프링클러 시스템의 연구를 통한 확대에 대한 가능성은 무한할 것으로 예상된다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2011.11a
• /
• pp.209-212
• /
• 2011

2003년 대구지하철화재를 보면 각종 대형 화재사고에서 법정 피난유도(유도등, 조명등)만으로는 화재 시 발생하는 연기 및 정전에 의하여 피난방향을 유도할 수 없음이 증명되었으며, 건축 계획적 측면에서의 안전을 확보하였다 하더라도 비상시 유도 설비들이 유도성능을 제대로 발휘하지 못 할 경우에 화재 상황으로부터 피난의 위험성을 가지고 있다고 할 수 있다. 따라서 소방 설비의 의존이 필요치 않은 자체적인 발광이 가능한 축광 안전용품이 필요시 하게 되었으며, 이에 현재 사용하고 있는 기존의 축광제품은 휘도가 떨어져 사실상 그 효과가 미미하며, 이 문제점을 해결하고자 지속발광 가능한 축광소재를 개발 하고자 한다.

• Proceedings of the KSR Conference
• /
• 2005.11a
• /
• pp.482-487
• /
• 2005

In the most current Turn-key bidding and Alternative design, is going to establish maintenance plan along with a economical assessment (VE/LCC assessment etc). Generally, establishment of maintenance plan is based on past experiences that are decided upon sensor position and amount with analytic or mechanical control section. But, it is more reasonable that maintenance plan based on level of significance for Probabilistic Risk, with presuming damage probability assessment of structural fracture scenarios. Therefore, in this study it is considered about the technique that an improved maintenance plan of railroad structures using PRA (Probabilistic Risk Assessment) on the basis of structural reliability theory. For this, in the paper, Preventive maintenance plan based on PRA is suggested with an application example of Pansong-Line (Line number 3) railway in Pusan works that actually executed Turn-key design.

• Proceedings of KOSOMES biannual meeting
• /
• 2008.05a
• /
• pp.33-42
• /
• 2008

The crimes and the vandalism committed by mental patients such as the burning of Syungremoon and Daegu's subway have become a social insecure factors. In the paper, the criminal status of mental patients is analyzed and the range of probabilities at sea investigated. The countermeasures to these crimes are proposed.

• Journal of Korea Water Resources Association
• /
• v.40 no.4
• /
• pp.313-324
• /
• 2007

An irregular cell-based numerical model was developed to analyze underground space flooding. In this model, the flow characteristics in underground space were computed by link-node system. Also, the model can simulate the underground flood flow related to the influence of stairs and wall-structures. Empirical discharge formula were introduced to analyze weir-type flow for shopping mall, and channel-type flow for subway railroad respectively. The simulated results matched in reasonable range compared with the observed depth. The dual-drainage inundation analysis model and the underground space flood analysis model were integrated using visual basic application of ArcGIS system. The developed model can help the decision support system of flood control authority for redesigning and constructing flood prevention structures and making the potential inundation zone, and establishing flood-mitigation measures.

• Fire Science and Engineering
• /
• v.30 no.4
• /
• pp.59-64
• /
• 2016

The PSD (Platform Screen Door System) has been installed to enhance the passengers' safety. A total of 592 stations operate the PSD system, which is almost 71.8% of all stations in South Korea. This study compared the opening rate between the PSD and train door, and calculated the exact amount of passengers at peak time. In addition, the evacuation time was simulated by Pathfinder 2015 with the exact input data. Some of the high density stations have extremely high dangerous points about the passengers' evacuation at some situations by the PSD door opening rate. In particular, due to the interference of a fixed door, when it stops at 7 m less than the regular position, its opening rate becomes less than half of the normal state. To solve this problem, it should be made possible to open the fixed door by changing it to an emergency door or improving the PSD module system.

• Tunnel and Underground Space
• /
• v.30 no.2
• /
• pp.149-163
• /
• 2020

This paper presents a logistic regression and GIS based urban ground sink susceptibility assessment using underground facility information considering soil particle loss. In the underground environment, the particle loss due to water flow or groundwater level change leads to the occurrence and expansion of cavities, which directly affect the ground sink. Four different contributory factors were selected according to the two underground facility domains (water pipeline area, sewer pipeline area) and subway line area. The logistic regression method was used to analyze the correlation and to derive the regression equation between the ground sink inventory and the contributory factors. Based on these results, three ground sink susceptibility maps were generated. The results obtained from this study are expected to provide basic data on the area susceptible to ground sink and needed to safety monitoring.

• Journal of Korean Society of Transportation
• /
• v.21 no.6
• /
• pp.57-65
• /
• 2003

Traffic congestion on the streets is the major concern of Metropolitan areas in Korea. Especially the signalized intersections are the main spots where traffic congestion is to be created. Currently the subway construction has been on the process in Taegu Metropolitan city. The subway stations are usually located at the intersections where a large number of vehicles and people are moving. During the constructional period, such an intersection creates profoundly a great deal of traffic congestion due to the open-cut constructional method. Under circumstance of the constructional method, the lane configurations should be changed frequently and the surface conditions make drivers uncomfortable. The propose of this study is to propose the improved method of traffic operation at the large circled intersection under the construction. The Signalized Modern Roundabout(SMR) is applied modifying from the modern roundabout. The geometric design and signal operation of SMR is developed in this study. To verify the operation of SMR the comparative study is conducted between the operation of the open-cut method and SMR method using the micro-simulation program, NETSIM. The result of simulation shows that the delay caused by the operation of SMR is not higher than that under the open-cut method. SMR makes also the constructional period shorten, makes the cost of construction lessened and makes drivers more comfortable as well than the method of open-cut. Therefore, the study concludes that the operation of SMR is more efficient, economic and safer method than that of open-cut method at the large circled intersection under construction.