• Title, Summary, Keyword: quantitative risk assessment

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Considerations for Quantitative Risk Assessment of Landslides using GIS (GIS기반 산사태재해의 정량적 피해 산정을 위한 고려사항 분석)

  • Kim, Jung-Ok;Kim, Ji-Young;Kim, Hyo-Joong;Kim, Yong-Il
    • 한국방재학회:학술대회논문집
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    • pp.645-648
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    • 2008
  • This study provides considerations for quantitative risk assessment of landslide on GIS technology. It shows how the landslide possibility analysis is linked by GIS modeling to provide loss estimation tools for landslide hazards in support of socio-economic loss reduction efforts. Those risk assessment results can deliver factual damage situation prediction to policy making for the landslide damage mitigation.

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A study on the quantitative risk grade assessment of initial mass production for weapon systems (초도양산 군수품에 대한 정량적 위험등급평가 방안 연구)

  • Jung, Yeongtak;Ham, Younghoon;Roh, Taegoo;Ahn, Manki;Ko, Kyungwa
    • Journal of the Korean Society for Quality Management
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    • v.46 no.3
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    • pp.441-452
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    • 2018
  • Purpose: The purpose of this paper is to study quantitative risk grade assessment for objective government quality assurance activities based on risk management in initial mass production for weapon systems. Methods: The Defense quality management regulations and foreign risk assessment documents are referred to analyze problems performing quality assurance actives. The failure rate data, maintainability and cost of products have been studied to quantify the risk Likelihood and impact. The analyzed data were classified as risk grade assessment through K-means Cluster Analysis method. Results: Results show that a proposed method can objectively evaluate risk grade. The analyzed results are clustered into three levels such as high, middle and low. Two products are allocated high, eleven low and seven middle. Conclusion: In this paper, quantitative risk grade assessment methods were presented by analyzing risk ratings based on objective data. The findings showed that the methods would be effective for initial mass production for weapon systems.

Quantitative Risk Assessment

  • Ryzin John Van
    • 대한예방의학회:학술대회논문집
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    • pp.469-475
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    • 1994
  • This paper presents a brief survey of current methodology available for quantitative risk assessment of environmental carcinogens. Four current models for low-dose extrapolation are reviewed. Current problems and controversies and possible options in doing quantitative risk assessments based on chronic animal studies are discussed.

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Prediction of Maintenance Period of Equipment Through Risk Assessment of Thermal Power Plants (화력발전설비 위험도 평가를 통한 기기별 정비주기 예측)

  • Song, Gee Wook;Kim, Bum Shin;Choi, Woo Song;Park, Myung Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.10
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    • pp.1291-1296
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    • 2013
  • Risk-based inspection (RBI) is a well-known method that is used to optimize inspection activities based on risk analysis in order to identify the high-risk components of major facilities such as power plants. RBI, when implemented and maintained properly, improves plant reliability and safety while reducing unplanned outages and repair costs. Risk is given by the product of the probability of failure (POF) and the consequence of failure (COF). A semi-quantitative method is generally used for risk assessment. Semi-quantitative risk assessment complements the low accuracy of qualitative risk assessment and the high expense and long calculation time of quantitative risk assessment. The first step of RBI is to identify important failure modes and causes in the equipment. Once these are defined, the POF and COF can be assessed for each failure. During POF and COF assessment, an effective inspection method and range can be easily found. In this paper, the calculation of the POF is improved for accurate risk assessment. A modified semi-quantitative risk assessment was carried out for boiler facilities of thermal power plants, and the next maintenance schedules for the equipment were decided.

A Study of Qualitative and Quantitative Risk Assessment for Highway Safety Facilities (고속도로 교통안전시설물의 정성적 및 정량적 위험도분석 연구)

  • Ji, Dong-Han;O, Yeong-Tae;Choi, Hyun-Ho
    • Korean Journal of Construction Engineering and Management
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    • v.8 no.4
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    • pp.99-109
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    • 2007
  • Risk elements of highway safety facilities are affected by complex environments. Thus, risk-based approach for traffic safety facilities is needed. For this, in this study, qualitative and quantitative risk assessment methodology and procedure for highway safety facilities is proposed, which can be used as risk-based approach incorporating VE process. Also, for the quantitative risk assessment, event tree using EPDO(Equivalent Property Damage Only) with respect to frequency and magnitude of risk events is introduced. As a result, risk index of alternative 1(140cm) and 2(127(cm) which can be used as performance factor in VE approach are estimated.

The Quantitative Risk Assessment for Railroad-tunnel Fire Incidents by using CFD code (CFD code를 이용한 철도터널 화재 위험도 평가)

  • Kim, H.B.;Lee, D.H.;Jang, Y.J.;Jung, W.S.
    • 한국전산유체공학회:학술대회논문집
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    • pp.169-172
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    • 2011
  • Recently, railroad long tunnels are increasing and growing longer due to topological feathers like a lot of mountain in Korea. But fire disaster of a long tunnel cause many people to injury and death. For that reason, at the early design stage of a long tunnel, risk assessment and mitigation measure of risk for satisfying tunnel safety are required. According to the railroad facility safety standard (Korean MLTM Announcement No. 2006-395), risk assessment for railroad-tunnel fire should be performed when design stage. Therefore, various methods of risk assessment for tunnel fire have been studied and applied. In the paper, QRA(Quantitative Risk Analysis) for fire risk assessment by using CFD code is presented and the usefulness of CFD is discussed.

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A Study on the Procedure of Quantitative Risk Assessment for High Pressure Natural Gas Pipeline (도시가스 고압배관의 정량적 위험평가 절차에 관한 연구)

  • Lee, Kyung-Sik;Jo, Young-Do;Ryou, Young-Don;Ko, Jae-Wook
    • Journal of the Korean Institute of Gas
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    • v.12 no.2
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    • pp.25-31
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    • 2008
  • Recently risk management based on a quantitative assessment is considered to improve the level of safety in Korea. This paper focuses on the procedure of the quantitative risk assessment for natural gas pipelines. For that purpose, the methods to estimate failure frequency based on failure causes from European Gas Pipeline Incident Data Group and BG Transco, to analyze consequence caused by fire, and to calculate individual risk and societal risk have been proposed systematically in this paper. Risk criteria of individual risk and societal risk have been proposed by considering the environment of pipeline route in Korea. The proposed procedure of quantitative risk assessment may be useful for risk management during the planning and building stages of a new pipeline, and modification of buried pipeline.

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Health Risk Assessment on Environmental Pollutants (환경오염물질의 건강위해성 평가)

  • 신동천
    • Journal of environmental and Sanitary engineering
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    • v.8 no.2
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    • pp.11-24
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    • 1993
  • Methodology for health risk assessment has been developed by governmental agencies and research institutions in the United States concerning environmental and industrial health such as Environmental Protection Agency, Pood and Drug Administration, and Occupational Safety and Health Administration. The basic concept, process, and scientific rational of the health risk assessment are discussed in order to introduce this field of research for future application to risk assessment and management in Korea. As environmental criteria for most of the environmental carcinogens and nonfarcinogens are set based on the quantitative risk assessment, this quantitative methodology should be emphasized and studied in Korean situation.

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Analysis of Marine Vessel Collision Risk based on Quantitative Risk Assessment

  • Koo, Bon Guk
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.3
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    • pp.319-324
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    • 2018
  • The collision problem is one of the design factors that must be carefully considered for the risk of collision occurring during the operation of ships and offshore structures. This paper presents the main results of the ship collision study, and its main goal is to analyze potential crash scenarios that may occur in the FLNG (Floating Liquefied Natural Gas) considering the likelihood and outcome. Consideration being given to vessels visiting the FLNG and surrounding vessels navigating around, such as functionally supported vessels and offloading carriers. The scope includes vessels visiting the FLNG facility such as in-field support vessels and off-loading carriers, as well as third party passing vessels. In this study, based on QRA (quantitative risk assessment), basic research methods and information on collision are provided. Based on the assumptions and methodologies documented in this study, it has been possible to clarify the frequency of collision and the damage category according to the type of visiting ship. Based on these results, the risk assessment results related to the collision have been derived.

Development of safety system for Road Tunnel - The study of Quantitative risk assessment for middle scale road tunnel with natural ventilation system - (도로터널 방재시스템 개발 - 자연환기를 수행하는 중규모 도로터널의 정량적 위험도평가관한 연구 -)

  • Yoo, Ji-Oh;Shin, Hyun-Jun;Kim, Jong-Won
    • Proceedings of the SAREK Conference
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    • pp.67-70
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    • 2008
  • As a part of the project on road tunnel fire safety system development, Quantitative Risk Assessment program was developed. In this study, We carried out Quantitative Risk Assessment with this program by using a factor of cross passage interval, warning announcement time and congestion ratio etc for 1km tunnel with natural ventilation. In the case of 250m below of cross passage interval, Risk value due to warning announcement time was a slightly changed. but if cross passage interval is more than 250m, expected fatalities in the same HRR(heat release rate) was sharp increased. As a result, Quantitative Risk Assessment program which was developed in this research project is possible to risk assessment with ventilation type, cross passage for evacuation and detection system response property etc. hereafter, this program look forward to use as a tool for road tunnel performance based design.

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