• Journal of Korea Ship Safrty Technology Authority
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• s.36
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• pp.43-55
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• 2014

새 정부는 국민의 행복실현을 위해 안전의 중요성을 강조하고 있다. 이에 해양수산부에서도 해양사고 30% 감소를 목표로 해양안전실천운동본부 발대식 및 해양안전헌장 선포, 선박안전관리자협의회 출범 등 민 관이 함께 해양에서의 안전 확보에 노력하고 있다. 그러나 안전관리의 주체인 해운선사의 안전관리 수준을 객관적으로 평가하기 위한 평가지표 및 안전관리 평가시스템 등은 없는 실정이다. 이에 본 연구에서는 도로, 철도, 항공 등 타 분야의 안전관리 정보시스템 구축 및 운영사례를 조사 분석하여 시사점을 도출하였다. 또한 해운선사의 안전관리 수준을 평가하기 위해 해양사고정보, 항만국통제 점검결과, 안전관리체제 심사결과 데이터를 분석하여 이들 데이터를 통합 관리할 수 있는 데이터베이스의 구축, 평가프로그램을 개발하였다. 본 연구에서 개발한 안전관리 평가시스템을 이용하여 해양안전 우수사업자 평가업무, 우수 선박관리사업자 인증업무 등에 활용할 수 있을 것으로 기대된다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.32 no.6
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• pp.458-464
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• 2020

Calibration of load-resistance factors for the limit state design of perforated caisson breakwaters are presented. Reliability analysis of 12 breakwaters in nationwide ports was conducted. Then, partial safety factors and load-resistance factors were sequentially calculated according to target reliability index. Load resistance factors were optimized to give one set of factor for limit state design of breakwater. The breakwaters were redesigned by using the optimal load resistance factor and verified whether reliability indices larger than the target value. Finally, some load-resistance factors were proposed by changing target reliability index.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.4
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• pp.267-277
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• 2009

Partial safety factors of the load, resistance, and reliability function are evaluated according to the target probability of failure on sliding mode of monolithical vertical caisson of composite breakwaters. After reliability function is formulated for sliding failure mode of caisson of composite breakwaters regarding bias of wave force, uncertainties of random variables related to loads, strengths are analyzed. Reliability analysis for the various conditions of water depth, geometric, and wave conditions is performed using Level II AFDA model for the sliding failure. Furthermore, the reliability model is also applied to the real caisson of composite breakwaters of Daesan, Dong- hae, and Pohang harbor. By comparing the required width of caisson of composite breakwater according to target probability of failure with the other results, the partial safety factors evaluated in this study are calibrated straightforwardly. Even though showing a little difference on the 1% of target probability, it may be found that the present results agree well with the other results in every other target probability of failure.

• 전기의세계
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• v.44 no.2
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• pp.35-38
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• 1995

원자력 안전규제 업무를 효과적으로 수행하기 위하여 세계 각국의 정부는 자국의 실정에 부합되는 적정한 수준의 원자력 안전규제 목표를 설정하고 이를 달성하기 위한 관련 법령의 정비와 필요한 안전규제 행정조직을 운영하고 있다. 이외에도 원자력 사업자가 제시하는 기술적 안전대책에 대하여 객관적이고도 공정한 평가를 수행할 수 있는 독립된 안전규제 전문기관을 설립하여 운영하므로서 규제업무수행의 질적 향상을 추구하고 있다. 이와 관련하여, 본 기고에서는 최근의 국내 원자력 안전 규제 법령, 조직 및 수행내용을 중심으로 우리나라의 원자력 안전규제 수행현황을 소개하고저 한다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.19 no.4
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• pp.336-344
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• 2007

A method is developed to evaluate partial safety factors for armor units, by which uncertainties of random variables in reliability function as well as wave height distribution with service periods could take into account straightforwardly. It is found that partial safety factors for resistance and wave height are correctly increased with improving target levels on failure of coastal structures at the same return and service periods. Therefore, it nay be possible to determine design variables through the same processes as those of deterministic method by using the partial safety factors for resistance and wave height evaluated in this paper, since uncertainties of random variables and the effects of service periods and target probability failure are directly considered in the processes of evaluation of partial safety factors.

• Journal of the Korean Society for Railway
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• v.15 no.2
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• pp.193-198
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• 2012

As a result of investment in railway safety since 2004, railway accidents have been reduced by half and we reached a high level of safety compared to other countries. But people are still worries about railway accident, and want safer railway. It is difficult to determine which level of safety must be achieved due to lack of comparative studies on railway safety among different countries and other transportation modes. In this study, a comparative study on railway accident statistics and various transportation modes is performed. The results of this research can be used for the determination of weak areas of railway safety and the level of safety to be achieved.

• Nuclear industry
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• v.6 no.11 s.45
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• pp.113-121
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• 1986

일본에서의 최근의 원자력안전성에 관한 논점에 대해서 일본 원자력의 기본정책, 원자력발전소의 인가절차 및 TMI-2 사고이후 일본에서 논의되어온 중요한 안전상의 문제점을 포함해서 개술소개코자 한다. 안전하고, 신뢰할 수 있는 원자력발전소 운전을 위해서는 높은 기술수준으로 플랜트를 설계$\cdot$제작$\cdot$건설하여야 되며, 주의깊게 운전하여야 된다. 또한 이상사태의 파급에 의한 영향을 체감시킴으로서 이상사태 발생방지에 최대한의 노력을 해야 할 것이다. 원자력안전연구를 열류체변동에 초점을 맞추었을 경우 1963년 이후 국가프로젝트로 진행된 것중 몇가지는 국제협력으로 되어 있는데 Source term, 중대사고, 안전목표 및 입지평가와 서로 관련시켜서 생각해야 할 것이다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.31 no.6
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• pp.351-355
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• 2019

Load resistance factors for the limit state design of vertical caisson breakwaters are presented. Reliability analysis of 16 breakwaters in nationwide ports was conducted to calculate the partial safety factors and they were converted into load and resistance factors. The final load resistance factor was calibrated by applying the optimization technique to the individually calculated load resistance factors. Finally, the breakwater was redesigned using the optimal load resistance factor and verified whether the target level was met. The load resistance factor according to the change of the target reliability level is presented to facilitate the limit state design of breakwater.

• Journal of the Korean GEO-environmental Society
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• v.15 no.2
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• pp.5-15
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• 2014

Target reliability index in the limit state design indicated the safety margin and it is important to determine the partial factor. To determine the target reliability index which is needed in the limit state design, the six design and construction case histories of gravel compaction piles (GCP) were investigated. The limit state functions were defined by bulging failure for the major failure mode of GCP. The reliability analysis were performed using the first order reliability method (FORM) and the reliability index was calculated for each ultimate bearing capacity formulation. The reliability index of GCP tended to be penportional to the safety factor of allowable stress design and average value was ${\beta}$=2.30. Reliability level that was assessed by reliability analysis and target reliability index for existing structure foundations were compared and analyzed. As a result, The GCP was required a relatively low level of safety compared with deep and shallow foundations and the currd t reliability level were similar to the target reliability in the reinforced earth retaining-wall and soil-nailing. Therefore the target reliability index of GCP suggested as ${\beta}_T$=2.33 by various literatures together with the computed reliability level in this study.

• Journal of the Korean Society for Railway
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• v.15 no.4
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• pp.402-407
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• 2012

Since reports on trip delays or incidents often appear as accident articles on the press, the social criticisms and concerns on the safety of the urban railway are increasing. Therefore, a railway authority sometimes adopts an abstract safety goal like "let's build the urban railway to a masterpiece level" or "let's obtain an aeronautic safety level" to make citizens relieved and to alert involved persons. However with a vague goal, it is almost impossible to make an implementation plan systematic which helps the authority academically verify and validate if the goal is achieved or not. In this paper, the features of the railway safety are described and the safety models for securing the safety of the urban railway are surveyed and categorized. Based on the comparisons among the features and limitations of the models, we identify a more practical model which can be applied to the urban railway more effectively.