• Title/Summary/Keyword: Screen door

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Quantitative Fire Risk Assesment for the Subway Platform Types (지하철 승강장 형식에 따른 정량적 화재 위험성 평가)

  • Rie, Dong-Ho;Kim, Ha-Young
    • Journal of the Korean Society of Safety
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    • v.21 no.6 s.78
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    • pp.1-6
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    • 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.

A Study on Safety Investment Moment for Safety Target (철도 안전목표 설성을 위한 안전투자 시점에 대한 연구)

  • Kwak, Sang Log
    • Journal of the Korean Society of Safety
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    • v.32 no.5
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    • pp.122-128
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    • 2017
  • Korean government announced long-term railway safety investment plan for the safety improvement by 2020. But no research have been done about differential analysis on railroad safety investment and safety improvement. In this study, recent 10 year data on safety investments and accident data are analysed for the differential analysis. Three main safety investments are analysed on regard to accident rate and accident fatalities. Three safety measures include level crossing accident, platform fatalities, and track trespass fatalities. About 90% of railway accident fatalities are caused by these three kind of accidents. Differential analysis shows about 4 to 6 years delay after railroad safety investment and safety improvement. This result can be utilized for the decision making on safety measures and safety target. Which required long term approach.

A NUMERICAL ANALYSIS OF TRAIN-WIND IN THE SUBWAY TUNNEL FOR THE IMPROVEMENT OF THE OF UNDERGROUND SPACE AIR QUALITY (지하공간의 공기 질 개선을 위한 지하철 터널 내 열차풍의 수치 해석적 연구)

  • Lee, J.H.;Juraeva, M.;Jeong, S.H.;Song, D.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.523-528
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    • 2011
  • Subway becomes more and more main transportation in major cities. Air pollution in the subway platforms is decreased; however, dust flow inside subway tunnel and train is increased by installing Platform Screen Door. Airflow inside subway tunnel is observed using computational method in this study The airflow characteristics around ventilation shafts and inside the tunnel is studied following the train movement, while the train moves from existing Miasamgeori station to Gireum station ANSYS CFX V12.0.l and ICEM CFD V12.0.l are used to compute the airflow inside the subway tunnel.

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RCM Activities for Improvement of Availability of AREX Railway System (공항철도의 운영가용도 향상을 위한 RCM 활동)

  • Lee, Chang-Hwan;Lim, Sung-Soo;Song, Mi-Ok
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.742-747
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    • 2008
  • This paper is described the systematic activities of RCM to improve the availability for AREX railway system. The purpose of these activities are to maintain and enhance the reliability, availability, maintainability and safety, and to implement the effective maintenance for electrical and mechanical system including rolling stock, signalling, telecommunication, power supply, overhead catenary and platform screen door with impact to train operation.. The main activities consist of systematic failure and repair recording by integral information system, analysis and corresponding countermeasure. As applying these activities in opeartion and maintenance works, the availability of AREX railway system is going on improvement gradually, and maintenacne works are improved with these results.

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A Study on the Unification of the Grounding System of Urban Railroad (도시철도 지하구간 접지설비 표준화 기준 연구)

  • Kim, Gyun-Sig;Park, Han-Yeong;Back, Yu-Ho;Sim, Jae-Chang
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.470-480
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    • 2008
  • After 1th line was built in 1974, the history of subway in Korea has been expended to 9th line which is under construction. It is time to prepare nation wide subway grounding system urgently according to the domestic electric standard that aligns to world wide standard by WTO/TBT treat (1995). Newly added grounding system to the fundamentally different system caused many problems. PSD(platform screen door) and other newly added equipment are also need grounding system. By the electrical code(established by Korea Electric Association), low voltage equipment(including grounding system) under 1,000V AC are in the process of change into IEC 60374. IEC 60364 standard will be added to the electrical code(established by Korea Electric Association) in 2007 and amended and after 3-5 years later, it will become a complete IEC 60364. So the purpose of this study is to compare the domestic rail road grounding system and suggest the standardized grounding system for the newly built subway.

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Risk Analysis using Failure Data in Railway E&M System

  • Lee, Chang-Hwan;Song, Mi-Ok;Lim, Sung-Soo
    • International Journal of Railway
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    • v.3 no.1
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    • pp.34-37
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    • 2010
  • In recent, the railway system consists of subsystems as rolling stock and infrastructures as signaling, telecommunication, power supply, overhead contact and platform screen door, etc. Furthermore, each subsystem has complicated interface so as not to understand these relationship. Consequently, to operate the railway system continuously with required safety and availability, the failure data should be corrected and analyzed systematically during operation. To achieve this object effectively, this paper presents the method which is evaluating the operational risk quantitatively using failure data, and selecting the critical equipment. Following this analysis, the improvement plan is established and applied to reduce the operational risk on system or equipment. From this study, the critical equipments of system could be determined and prioritized by risk analysis. Also, the effective maintenance to prevent critical failure could be implanted by this suggested methodology.

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A Study on the Quantitative Quality of Service(QoS) of the Light Railway Transit System (경전철시스템의 정량적 서비스 품질에 관한 연구)

  • Ha, Chen-Soo;Ahn, Seok-Hwan;Lee, Chang-Huyng
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.2058-2064
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    • 2008
  • This study is concerned with the quantitative Quality of Service(QoS) of the Light Railway Transit(LRT) System. Generally, the QoS offered to passengers by the Operator of LRT system can be quantified in various ways. In this paper, we assumed that the QoS is a combination of both Train Delivery and Train Punctuality under considering LRT characteristics including core sub-systems such as, rolling stock, signalling, power-supply and PSD(platform screen door), etc. We also, provide a quantitative analysis method to evaluate the QoS related the reliability of LRT system.

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A Study on Scenario Model for Passenger Casualty Accidents Related to PSD(Platform Screen Door) (승강장안전문 승객교통사상사고 시나리오 모델에 대한 고찰(考察))

  • Cho, Raehyuck;Kim, Sungil;Jeong, Seungkweon
    • Journal of The Korean Society For Urban Railway
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    • v.6 no.4
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    • pp.223-231
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    • 2018
  • Since the introduction of PSD in 2005, the number of accidents involving passengers falling onto the tracks accidentally or intentionally have drastically decreased, but the number of PSD related passenger accidents is increasing. While existing papers on PSD have been devoted to systemic introduction and system improvement, papers on passenger casuality accidents due to deteriorated PSD have been limited. This paper proposes revising of the scenario model for passenger accidents using classified hazard sources of PSD.

Criteria of Evaluating Clothing and Web Service on Internal Shopping Mall Related to Purchase Experience (인터넷 쇼핑몰 이용자의 의류제품 구매경험에 따른 의류제품 및 웹 서비스 평가기준에 관한 연구)

  • 이경훈;박재옥
    • Journal of the Korean Society of Clothing and Textiles
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    • v.28 no.5
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    • pp.603-614
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    • 2004
  • The purpose of this study was to investigate the criteria of evaluating clothing and web service on internet shopping malls related to consumers' shopping behavior, This study surveyed consumers who have an experience of buying products on the internet shopping mall and the questionnaire and judgment sampling was used. The subjects were 305 men and women living in the metropolitan area. Method of data analysis were factor analysis, t-test, ANOVA, Duncan test and descriptive statistics. The results were as follows: the items buy from the internet were t-shirts, blouses, knits, skirts and pants. The reasons for buying clothing on the internet were good prices, time saving, door-to-door delivery, while the reasons for not buying on the internet were worries about differences between the product shown on the screen and the actual one, quality guarantee, delivery accident and inconvenience in exchange and refund. Among the differences of clothing evaluation criteria according to internet shopping behavior, significant differences were found in the esthetic criteria and the quality performance criteria according to internet using hours, and in the esthetic criteria according to buying experiences. Among the differences of web service evaluation criteria according to internet shopping behavior, the differences among the groups were found in the reliance criteria, the product reference criteria, the order processing criteria and the handling after purchase criteria according to internet using hours. The significant differences were found in the handling after purchase criteria and the promotion$.$policy criteria according to buying experience, and in the promotion$.$policy criteria according to times of purchase.

A study on the improvement of the air exhaust system at the PSD installed subway station (도시철도 지하역사 PSD 설치에 따른 배기시스템 개선 연구)

  • Kwon, Soon-Bark;Song, Ji-Han;Ryu, Ju-Hwan;Jo, Seung-Won;Oh, Tae-Suk;Bae, Sung-Joon;Kim, Hyo-Gyu
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.3
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    • pp.353-362
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    • 2015
  • Platform screen door (PSD) installed at underground subway station has reduced the safety accident, but it may cause poor air ventilation condition due to the isolated exhaust duct in the subway tunnel area. In this study, the additional ventilation system was suggested, which can be installed at a void space (i.e., storage room under stairs) of platform in order to improve efficiency of air ventilation rate. Exhausted air from platform was directed to underneath of platform and joined with existing ventilation duct of train exhaust system (TES). One subway station in Seoul city was selected to predict the effectiveness of the suggested lower exhaust system by using the computational fluid dynamics (CFD) analysis. The predicted mean age of air was decreased by 16.5% which proves the improvement of air ventilation efficiency when the suggested lower exhaust system was applied.