• 한국지하수토양환경학회지:지하수토양환경
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• 제27권spc호
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• pp.1-18
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• 2022

A conceptual site model is used to support decision-making of response strategy development, determination, and implementation within a risk-based contaminated site management system. It aims to provide base information of the relevant site characteristics and surface/subsurface conditions in order to understand the contaminants of concern and the associated risk they pose to the receptors. This study delineated the technical details of conceptual site model development, and discussed the possibility of applying it in domestic subsurface contamination management. Conceptual site models can be developed in various formats such as tables, diagrams, flowcharts, and figures. Contaminated sites are managed for a long period of time following the steps of investigation, remediation design, remediation, verification, and post-remedation management. The conceptual site model can be enhanced in each stage of the contaminated site management based on the continuously updated information on the site's subsurface environment. In the process of enhancement for conceptual site model, precision is gradually improved, and it can evolve from a conceptual and qualitative form to a more quantitatvive and three-dimensional model. In soil pollution management, it is desirable to incorporate the conceptual site model into the soil scrutiny system to better assess the current status of the contaminated site and support follow-up investigation and management.

• 한국가스학회지
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• 제9권2호
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• pp.28-33
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• 2005

화학 산업시설은 위험 물질을 대규모로 취급하기 때문에 사고 발생 시 사업장 근로자뿐만 아니라 사업장 주변의 주민들에게까지 피해를 끼칠 수 있다. 이러한 대형사고를 효과적으로 제어하고 대응하기 위해서 국내 화학산업단지의 위험성을 객관적으로 수치화하여 묘사할 수 있는 위험도 표현 시스템의 개발이 필요하다. 이에 본 연구에서는 사업장별 위험도를 전자 지도 망에 표기하여 실제 위험성을 파악하고 파악된 위험성을 감소시킬 수 있는 대책을 강구 할 수 있도록 위험도 표현 시스템(S/W)을 개발하였다.

• Earthquakes and Structures
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• 제13권4호
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• pp.421-427
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• 2017

Seismic safety evaluation of weir structure is significant considering the catastrophic economical consequence of operational disruption. In recent years, the seismic probabilistic risk assessment (SPRA) has been issued as a key area of research for the hydraulic system to mitigate and manage the risk. The aim of this paper is to assess the seismic probabilistic risk of weir structures employing the seismic hazard and the structural fragility in Korea. At the first stage, probabilistic seismic hazard analysis (PSHA) approach is performed to extract the hazard curve at the weir site using the seismic and geological data. Thereafter, the seismic fragility that defines the probability of structural collapse is evaluated by using the incremental dynamic analysis (IDA) method in accordance with the four different design limit states as failure identification criteria. Consequently, by combining the seismic hazard and fragility results, the seismic risk curves are developed that contain helpful information for risk management of hydraulic structures. The tensile stress of the mass concrete is found to be more vulnerable than other design criteria. The hazard deaggregation illustrates that moderate size and far source earthquakes are the most likely scenario for the site. In addition, the annual loss curves for two different hazard source models corresponding to design limit states are extracted.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 추계 학술발표회
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• pp.509-514
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• 2006

Considering the risk management, there are many examples and various studies for the corporation risk. However, I have never seen the project risk management that applied a construction site for practical approach. Therefore, I have developed a chart (I-Chart) for the project risk management, and also built a model (I-Chart scenario analysis) that I could use. I applied this model to container yard reclaimed land in harbor construction with approaching of geotechnical engineering.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.201-202
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• 2019

This paper aimed to identify potential opportunities of building information modeling (BIM) utilization for construction risk management. Construction risk factors and BIM functions were derived through conducting in-depth literature review. Nineteen construction risk factors could be resolved by various BIM functions. Phase planning, site analysis, design authoring, and 3D design coordination were identified as the most efficient BIM functions for construction risk management.

• Environmental Engineering Research
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• 제13권2호
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• pp.73-78
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• 2008

For a given soil-contaminated site, a level of soil contamination is characterized and decisions on risk may be made from the risk assessment. The study evaluated critical design factors for the determination of sample size in the sampling design plan and the assessment of soil contaminant- leaching to groundwater. Two variables, the minimum relative detectable difference (T) and coefficient of variation (CV) were evaluated for the sample size determination. The minimum number of samples can be appropriately determined by CV under a T value greater than or equal to 0.2. Soil-contaminant leaching to groundwater was evaluated by using the Soil Screening Level equation of U.S. Environmental Protection Agency and the Risk Based Screening Level equation of American Society for Testing and Materials, with the same input parameters. The groundwater concentrations estimated from soil contaminant concentrations were significantly affected by the Darcy velocity of groundwater and the organic content of soil.

• Nuclear Engineering and Technology
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• 제34권6호
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• pp.586-595
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• 2002

The Seismic probabilistic risk assessment (SPRA) or seismic margin assessment (SMA) have been used for the seismic safety evaluation of nuclear power plant structures and equipments. For the SPRA or SMA, the reference response spectrum should be defined. The site-specific median spectrum has been generally used for the seismic fragility analysis of structures and equipments in a Korean nuclear power plant Since the site-specific spectrum has been developed based on the peak ground motion parameter, the site-specific response spectrum does not represent the same probability of exceedance over the entire frequency range of interest. The uniform hazard spectrum is more appropriate to be used in seismic probabilistic risk assessment than the site- specific spectrum. A method for modifying the seismic fragility parameters that are calculated based on the site-specific median spectrum is described. This simple method was developed to incorporate the effects of the uniform hazard spectrum. The seismic fragility parameters of typical NPP components are modified using the uniform hazard spectrum. The modification factor is used to modify the original fragility parameters. An example uniform hazard spectrum is developed using the available seismic hazard data for the Korean nuclear power plant (NPP) site. This uniform hazard spectrum is used for the modification of fragility parameters.

• Nuclear Engineering and Technology
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• 제52권5호
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• pp.975-983
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• 2020

Since the Fukushima Daiichi accident in 2011, concerns for the safety of multi-unit Nuclear Power Plant (NPP) sites have risen. This is because more than 70% of NPP sites are multi-unit sites that have two or more NPP units and a multi-unit accident occurred for the first time. After this accident, Probability Safety Assessment (PSA) has been considered in many countries as one of the tools to quantitatively assess the safety for multi-unit NPP sites. One of the biggest concerns for a multi-unit accident such as Fukushima is that the consequences (health and economic) will be significantly higher than in the case of a single-unit accident. However, many studies on multi-unit PSA have focused on Level 1 & 2 PSA, and there are many challenges in terms of public acceptance due to various speculations without an engineering background. In this study, two kinds of multi-unit Level 3 PSA for multi-unit site have been carried out. The first case was the estimation of multi-unit risk with conservative assumptions to investigate the margin between multi-unit risk and QHO, and the other was to identify the effect of time delays in releases between NPP units on the same site. Through these two kinds of assessments, we aimed at investigating the level of multi-unit risk and understanding the characteristics of risk in a multiunit context.

• 대한치과의사협회지
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• 제51권12호
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• pp.637-642
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• 2013

Because the implant is regarded as a common treatment. It is clinically important that systemic and local risk factor of threatening peri implant mucosa should be considered during the process. The most risk factors are detected in clinical diagnosis, but it might be difficult and not clear to recognize systemic or combined factors. This article reviews risk factors of peri-implantitis. Local factors are biomechanics, periodontal soft tissue characteristics, infected site and oral hygiene. Systemic factors are alcohol, smoking and genetic traits.

• 한국재난정보학회 논문집
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• 제18권2호
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• pp.395-404
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• 2022

연구목적:소규모 건축현장은 체계적인 안전관리활동이 미흡하고 건설현장의 특성상 외부환경의 요인으로 생산구조가 복합적이고 건설장비의 위험성 등으로 인해 산업재해의 가능성이 매우 높은 실정이다. 소규모 건설현장의 재해예방을 위한 위험요인을 도출하고 재해를 줄일 수 있는 실무적인 위험성평가의 기법 중 체크리스트 방법을 제안하고자 한다. 연구방법: 문헌조사와 재해사례를 분석하여 위험요인을 도출하여 위험요인 항목을 중심으로 소규모 건설현장에 적합하고 효율적인 위험성평가의 체크리스트를 위한 세부작업을 분류하였다. 연구결과:위험요인을 6개의 대분류로 구분하고 실질적인 작업공종을 중심으로 29개의 세부공종을 분류 하였으며 이에 따른 세부작업을 80개로 구분하였다. 결론:소규모 건축현장에 적합한 위험요인을 분류체계에 따라 정리함으로써 건설현장에 부족한 전문성을 보완할 수 있고 보다 쉽게 위험요인을 도출하여 안전대책수립을 통한 재해감소를 기대할 수 있을 것으로 보인다.