• Journal of Korean Society of Transportation
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• v.33 no.3
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• pp.276-283
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• 2015

Pedestrians have been exposed to dangerous traffic environments, in which walking spaces in a city decrease without improved facilities even though cars increase. Such poor walking environments are deadly dangerous to the vulnerable as well as the non-vulnerable. This study analyzed the road facilities use characteristics according to a type of vulnerability in order to improve traffic safety and walking environment for vulnerable pedestrians. This study surveyed the vulnerable in terms of issues that they encountered on existing walkways and conducted the analytic hierarchy process (AHP), which took all quantitative and qualitative variables into account. The results of Level-3 analysis were showed that the elderly and the disabled were partially similar; both felt most inconvenient at enter-exit sections, steep walkway and bad paved walkway. Unlike those results, people with children and/or infants answered that overpass or underpass walkways without lifting facilities were most inconvenient walking environments.

• Journal of Industrial Convergence
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• v.17 no.1
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• pp.33-39
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• 2019

The purpose of this study was to present the direction and implications of urban development in relation to climate risk factors and environment for practical implementation of urban development in response to climate change. The research method was carried out through a qualitative data survey and analysis. As a result of the study, the direction of urban development according to the climate risk factors emphasized the importance of preparing conditions for urban development by establishing a damage prevention system for natural disasters and analyzing the risk of natural disasters by conducting analysis of the impact and vulnerability of climate change in urban planning. The direction of urban development on the environmental side suggested the need for the promotion of public transport oriented development (TOD) in the form of urban planning to realize sustainable and practical urban development. Future research directions will need to be supplemented with more quantitative and empirical findings.

• Korean Journal of Construction Engineering and Management
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• v.25 no.5
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• pp.25-31
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• 2024

The purpose of this study is to propose a model development framework to predict the risk of safety accidents for foreign workers based on a deep learning algorithm for systematic safety management of foreign workers in the construction industry. Many past studies have shown that foreign workers working at construction sites are relatively more vulnerable to safety accidents than non-foreign workers, but quantitative research on the risk of safety accidents among foreign workers working at construction sites is lacking. Furthermore, due to a lack of predictive research on safety accidents, realistic and systematic safety management for foreign workers is not possible. Therefore, in order to complement this, this study proposes a deep learning algorithm-based model that collects, analyzes, and predicts safety accident data occurring at construction sites for systematic safety management of foreign workers at construction sites. The results and framework of this study can be used to analyze and predict various safety accident risks that occur at construction sites, and ultimately can serve as an important guideline for safety management of foreign workers at construction sites.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.53-53
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• 2023

현대 사회에서 해상 운송은 전체 화물 운송의 약 80%를 차지하는 국제 무역 및 경제 활동의 핵심적인 요소이다. 이에 따라 선박 교통 관제는 해상 안전과 운송 효율성을 향상시키는 데 있어 아주 중요한 역할을 수행하고 있다. 보다 안전한 해상 운송을 지속하기 위해서는 효율적이고 스마트한 선박 교통 관제 시스템이 필수적이므로 본 연구에서는 선박 교통 관제 시스템인 VTS 운용 콘솔 상 해상교통위험도를 시각화하는 것을 제안한다. 우선, 현 관제사를 대상으로 시선 추적 실험을 실시함으로써 관제사의 시선 분포를 통해 주요 관찰 대상과 작업 우선순위 등을 살펴보았다. 이후 동일한 해역에 동일한 시간대의 교통 밀도와 해상 교통 위험도를 정량적으로 평가하고, 이를 관제사의 시선 추적 데이터와 비교 분석하였다. 분석 결과, 객관적인 데이터를 활용하여 관제사의 의사 결정과 수행 업무를 지원하는 것이 해상 교통 관리의 효율성과 안전성을 향상시킬 수 있음을 확인하였다. 이는 미래에 보다 안전하고 효율적인 해상 운송 시스템의 구현을 위한 실질적인 기여가 될 것으로 기대된다.

• Journal of the Korea Convergence Society
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• v.13 no.2
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• pp.67-75
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• 2022

The purpose of this study is to present an appropriate management plan as a supplement to the scientific evidence of the currently operated distancing system for preventing COVID-19. The currently being used mathematical models are expressed as simultaneous ordinary differential equations, there is a problem in that it is difficult to use them for the management of entry and exit of small business owners. In order to supplement this point, in this paper, a method for quantitatively expressing the risk of infection by people who gather is presented in consideration of the allowable risk given to the gathering space, the basic infection reproduction index, and the risk reduction rate due to vaccination. A simple quantitative model was developed that manages the probability of infection in a probabilistic level according to a set of visitors by considering both the degree of infection risk according to the vaccination status (non-vaccinated, primary inoculation, and complete vaccination) and the epidemic status of the virus. In a given example using the model, the risk was reduced to 55% when 20% of non-vaccinated people were converted to full vaccination. It was suggested that management in terms of quarantine can obtain a greater effect than medical treatment. Based on this, a generalized model that can be applied to various situations in consideration of the type of vaccination and the degree of occurrence of confirmed cases was also presented. This model can be used to manage the total risk of people gathered at a certain space in a real time, by calculating individual risk according to the type of vaccine, the degree of inoculation, and the lapse of time after inoculation.

• Journal of the Korean Institute of Gas
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• v.9 no.2 s.27
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• pp.43-49
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• 2005

Today toxic gas has various uses. If there is a release accident, the gas rapidly disperse into the atmosphere. The extent of damage due to toxic gas accident is very wide and fatal to human being. So, it is necessary for toxic gas facilities which have high risk to construct an emergency response system that prepare to toxic release and make immediate response to be possible at accident appearance. In this study accident scenario were selected and frequency analysis was executed using FTA technique. Dispersion effect of toxic gas release was analyzed using DNV company's PHAST(Ver. 6.2). Finally, an emergency response system was developed using results of quantitative risk analysis.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.136-136
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• 2018

최근 기후변화로 인해 설계 빈도 이상의 강우가 빈번하게 발생하고 있으며 이러한 집중호우에 의한 피해는 지역별로 토지이용, 사회 환경적인 조건에 따라 차이가 있다. 특히 인구와 경제 제반 시설이 밀집되어 있는 도시지역의 경우 홍수가 발생하게 되면 피해가 과거에 비해 큰 규모로 나타나고 있다. 현재 각 지자체는 홍수 대응을 위해 기상청에서 제공하고 있는 6시간, 12시간 강우량을 기준으로한 호우주의보 및 경보를 사용하고 있다. 하지만 도시지역의 경우 지속시간이 1~2시간인 짧은 호우에서 피해가 발생하여 기상청에서 제공하고 있는 홍수특보를 활용하는데 있어 한계가 있다. 또한 이러한 기준은 각 지역별 사회 경제적 특성을 반영하지 않아 지역별 실질적인 홍수 대응에 효과적이지 않다. 따라서 각 지역별로 특성을 파악하여 홍수에 대한 피해를 저감하기 위한 대책 수립이 필요한 실정이다. 본 연구의 공간적 범위로 한강권역에서 서울시와 인천시의 경우 '구 단위', 경기도와 강원도, 충청북도는 '시 군 단위'로 총 88개 행정구역으로 하고 도시별 특성에 따라 군집화를 위해 환경적, 사회적 및 경제적 특성 중 홍수에 대한 취약성을 반영할 수 있는 인자를 선정하였다. 선정된 인자들을 주성분분석을 통해 공통된 특성이나 유사한 성질에 따라 공통인자를 추출하고 이를 이용하여 각 도시별 군집분석을 시행하였다. 그 후 각 도시 군집별 특성에 따라 홍수에 의한 피해를 가장 잘 나타낼 수 있는 인자를 위험영향(Risk Impact)으로 산정하였다. 이때 위험영향은 강우규모에 따른 잠재 피해 정도를 나타내며 홍수위험도표를 작성하기 위해서는 이러한 위험영향을 정량적으로 설명할 수 있어야 한다. 본 연구에서는 각 도시 군집별 특성에 따른 위험영향의 임계값을 추정하고 그에 따른 홍수위험도표를 작성하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.448-452
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• 2011

기존의 하천개수사업 치수경제성분석에서는 홍수피해경감편익 산정시 계획홍수위 이하의 홍수에 대해서 제방이 완벽히 방어한다는 가정 하에 제방으로 인한 피해경감액을 편익으로 산정하고 있다. 그러나 전통적 빈도해석 방법 및 수리수문 모형에 내재된 매개변수 불확실성으로 인하여 특정 하천구간에서 산정된 계획빈도 이하의 홍수위가 제방고에 해당하는 임계사상을 초과할 수도, 반대로 계획빈도 이상의 홍수위가 임계사상을 초과하지 않을 가능성도 있다. 이러한 불확실성은 수공구조물의 붕괴에 대한 잠재성을 가진 중요한 요인으로도 작용한다. 본 연구는 이러한 잠재적 위험도를 제방 월류위험도로 정의하고 이를 Bayesian MCMC에 의해 산정하는 방법을 제시하였다. 제시된 방법론은 4대강살리기사업 전 후에 대해 적용하였으며, 계획홍수위 저하에 따른 잠재적 홍수위험 감소 효과를 정량적으로 나타낼 수 있었다. 월류 위험도는 빈도별 홍수피해액의 피해발생 확률로서도 적용될 수 있으며, 이는 물리적 침수구역 설정의 어려움에 따른 홍수피해액 과다산정 문제 해결의 대안으로서도 의미가 있다.

• Nuclear Engineering and Technology
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• v.19 no.4
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• pp.292-309
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• 1987

A large dry PWR containment response analysis for postulated severe accidents was performed as part of the Zion Risk Rebaselining study for input to the U.S. NRC's "Reactor Risk Reference Document," NUREG-1150. The Methodologies used in the present work were developed as part of the Severe Accident Risk Reduction Program (SARRP) at Sandia National Laboratory specifically for the Surry Plant, but they were extrapolated to Zion. Major steps of the quantification of risk from a nuclear power plant are first outlined. Then, the methodologies of containment response analysis for severe accidents used for Zion are described in detail: major features of the containment event tree (CET) analysis codes and CET quantification procedures are summarized. In addition, plant specific features important to containment response analysis are presented along with the containment loading and performance issues included in the present uncertainty analysis. Finally, a brief summary of the results of deterministic and statistical containment event tree analysis is presented to provide a perspective on the large dry PWR containment response for postulated severe accidents.accidents.

• Journal of the Earthquake Engineering Society of Korea
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• v.8 no.6 s.40
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• pp.31-43
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• 2004

Seismic risk assessment of bridge is presented using fragility curves which represent the probability of damage of a structure virsus the peak ground acceleration. In theseismic fragility analysis, the structural damage is defined using the rotational ductility at the base of the bridge pier, which is obtained through nonlinear dynamic analysis for various input earthquakes. For the assessment of seismic risk of bridge, peak ground accelerations are obatined for various return periods from the seismic hazard map of Korea, which enables to calculate the probability density function of peak ground acceleration. Combining the probability density function of peak ground acceleration and the seismic fragility analysis, seismic risk assessment is performed. In this study, seismic fragility analysis is developed as a function of not the surface motion which the bridge actually suffers, but the rock outcrop motion which the aseismic design code is defined on, so that further analysis for the seismic hazard assessment may become available. Besides, the effects of the friction pot bearings and the friction pendulum bearings on the seismic fragility and risk analysis are examined. Lastly, three regions in Korea are considered and compared in the seismic risk assessment.