• Nuclear Engineering and Technology
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• 제49권2호
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• pp.380-386
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• 2017

Fennovoima's nuclear power plant, Hanhikivi 1, $Pyh{\ddot{a}}joki$, Finland, is currently in design phase, and its construction is scheduled to begin in 2018 and electricity production in 2024. The objective of this paper is to produce a preliminary list of safety-significant external event combinations including preliminary probability estimates, to be used in the probabilistic risk assessment of Hanhikivi 1 plant. Starting from the list of relevant single events, the relevant event combinations are identified based on seasonal variation, preconditions related to different events, and dependencies (fundamental and cascade type) between events. Using this method yields 30 relevant event combinations of two events for the Hanhikivi site. The preliminary probability of each combination is evaluated, and event combinations with extremely low probability are excluded from further analysis. Event combinations of three or more events are identified by adding possible events to the remaining combinations of two events. Finally, 10 relevant combinations of two events and three relevant combinations of three events remain. The results shall be considered preliminary and will be updated after evaluating more detailed effects of different events on plant safety.

• 한국융합학회논문지
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• 제13권1호
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• pp.357-364
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• 2022

본 연구는 인문학적 사고를 향상시키기 위해 예비대학 프로그램을 개발, 운영, 평가하는 플랫폼 설계를 목적으로 한다. 이를 위해 본 연구에서는 P 대학의 특성에 맞는 예비대학을 설계하기 위하여 전문가 인터뷰와 재학생 설문조사를 실시하고, 분석된 결과를 토대로 인문학을 기반으로 하는 예비대학의 모델을 제안하였다. 전문가 대상 인터뷰 결과 온라인 플랫폼에 기반한 예비대학 모델 구축 및 인문학적 사고에 기반한 인재 양성 교육의 필요성 등이 제시되었다. 재학생 대상 설문 결과에서는 인문학 기반의 예비대학 운영의 필요성을 인식하고 있는 것으로 나타났다. 연구 결과를 반영하여 본 연구에서는 P 대학에 적합한 인문학 기반 예비대학 모델을 제안하고자 한다. 제안된 예비대학 모델 운영을 통해 참여 학생들이 대학인으로서 갖추어야 할 인문학적 사고가 확장되는 계기가 될 것으로 본다. 후속 연구에서는 플랫폼 기반 프로그램 운영을 통해 교육적 효과를 검증할 필요가 있다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 추계학술대회 논문집
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• pp.295-298
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• 2008

The major function of the nacelle cover is protecting the inside equipments. Therefore, it is required not only sufficient strength and stability but also light weight. In this paper, design loads are calculated according to the GL Wind guideline Ed. 2003. To ensure the structural safety, a composite structure is selected. The structural design is processed by two steps which are preliminary design and detail design. In the preliminary design step, a structural analysis is performed with initial thickness, 5mm. As reviewing above analysis results, weak regions of the nacelle cover reinforced using the spar cap structure which is same as the blade structure. In the analysis model, the support structure is connected with the nacelle cover and analyzed its structural safety at the same time.

• KDI Journal of Economic Policy
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• 제42권4호
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• pp.91-116
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• 2020

As a project appraisal tool, the preliminary feasibility study (PFS) has contributed to enhancing the efficiency of public investment decision-making in the Republic of Korea over the last two decades. To overcome the limitations of the efficiency-oriented cost-benefit analysis, the PFS accommodates equity concerns among regions, namely balanced regional development (BRD) analysis. This study attempts to gauge the contributions of BRD analysis to PFS results. Specifically, it addresses how effectively policy efforts to promote decision-making have been implemented in the PFS stage while also considering the balance between equity and efficiency in terms of the trade-off between them, the degree to which they influence the results, and whether the consideration of equity is in fact actually reflected in seriously underdeveloped regions as intended. The study finds that the PFS results over the last two decades have been largely in line with the background and policy objectives. Based on the findings of the study, needs for institutional improvement are suggested, including enhancements in the analysis of regional economic ripple effects and taking into account the psychological factors pertaining to the evaluators in the overall judgment.

• 한국산업융합학회 논문집
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• 제27권2_1호
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• pp.277-285
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• 2024

Hydrogen is considered a key energy source to achieve carbon neutrality through the global goal of 'net zero'. Due to limitations in producing green hydrogen domestically, Korean companies are interested in importing green hydrogen produced overseas. The Middle East has high-quality solar energy resources and is attracting attention as a region producing green hydrogen using renewable energy. To build a green ammonia plant, optimization of the production facility configuration and economic feasibility analysis are required. It is expected that it will contribute to reviewing the economic feasibility of constructing overseas hydrogen production plants through preliminary economic feasibility analysis.

• International Journal of Aeronautical and Space Sciences
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• 제10권2호
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• pp.134-139
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• 2009

Various modules are generally combined with one another in order to perform rotorcraft preliminary design and its optimization. At the stage of the preliminary design, analysis fidelity is less important than the rapid assessment of a design is. Most of the previous researchers attempted to implement sophisticated applications in order to increase the fidelity of analysis, but the present paper focuses on a rapid assessment while keeping the similar level of fidelity. Each small-sized module will be controlled by an externally-operated global optimization module. Results from each module are automatically handled from one discipline to another which reduces the amount of computational effort and time greatly when compared with manual execution. Automatically handled process decreases computational cycle and time by factor of approximately two. Previous researchers and the rotorcraft industries developed their own integrated analysis for rotorcraft design task, such as HESCOMP, VASCOMP, and RWSIZE. When a specific mission profile is given to these programs, those will estimate the aircraft size, performance, rotor performance, component weight, and other aspects. Such results can become good sources for the supplemental analysis in terms of stability, handling qualities, and cost. If the results do not satisfy the stability criteria or other constraints, additional sizing processes may be used to re-evaluate rotorcraft size based on the result from stability analysis. Trade-off study can be conducted by connecting disciplines, and it is an important advantage in a preliminary design study. In this paper among the existing rotorcraft design programs, an adequate program is selected for a baseline of the design framework, and modularization strategy will be applied and further improvements for each module be pursued.

• 한국인터넷방송통신학회논문지
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• 제16권5호
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• pp.49-54
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• 2016

디지털 증거를 다루는 범죄 사건 수사가 증가함에 따라 초동조치를 할 수 있는 인력과 개선된 수사절차 모델의 필요성이 증가하고 있다. 최근 들어 디지털 포렌식 분류(triage)와 예비분석 등의 개념이 수사 연구기관에 각광을 받고 있다. 하지만 초동조치 대응인력 및 예비분석관들이 구체적으로 어떤 훈련을 받아야 하는지에 대한 연구는 그다지 주목받지 못했다. 오히려 많은 조직에서 초동조치 대응인력이 전문적인 디지털 포렌식 분석관과 같은 실력을 갖추어야 한다고 여기고 있다. 본 연구에서는 '이상적인' 상황에서 디지털 수사의 초동조치 대응인력과 예비분석관들이 어떤 능력을 갖추어야 하며, 하드웨어 및 소프트웨어 측면에서의 필요사항과, 어쩌면 가장 중요하다 할 수 있는 교육훈련 조건에 대해 논하고자 한다.

• 보건교육건강증진학회지
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• 제16권2호
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• pp.81-92
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• 1999

This study attempt to analyze the influence of the preliminary education on the Elderly's attitude for death and to present basic data for the death-preliminary education. The data were collected by administerial the Questionnaire interview with 169 the elderly who was 200 the elderly over 60 year old in silver colleges. The Questions was consists the awareness recognition of death, character, attitudes toward for death. The statistical methods used for the analysis were t-test, factor analysis. The results were the follows. There was no statistically significant relations between the fear of death and the general characteristics the elderly, but the old women felt more anxiety than old men. Especially, more aged, unhealthy the elderly felt it more and the lower educated or the single felt it more severely. The change in the attitude for death: They attitude for death was considerably changed after the preliminary education. Fears and anxiety about death were more reduced and the inevitability of death was accepted positively. This result showed the influence of the preliminary death education had positive affliction of the elderly's attitude for death. Accordingly, with the practice of the preliminary education we can release the elderly from the fear for death and guide them to live meaningly.

• 한국기계연구소 소보
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• 통권14호
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• pp.111-119
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• 1985

A review on the design analysis of an axial-flow turbine is presented. Followed by a brief introduction to the fundamentals on an axial-flow turbine, a design procedure is described with a sample design of one for a small turbo-jet engine. Design procedure is composed of two parts: one-dimensional analysis of three-dimensional effects based on radial equilibrium theory. The method described herein is so simple and rapid that it can be applied to the preliminary design analysis of turbo-machinery equipped with axial-flow turbines.

• 대한기계학회논문집
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• 제14권3호
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• pp.656-663
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• 1990

본 연구에서는 이러한 해석적 근사해를 이용한 스터링기관의 최적설계조건에 관하여 취급하고자 한다. 단열해석의 결과를 대응하는 등온해석과 비교, 고찰함으로 써 방법에 따른 조건의 차이를 보이고 주요 설계인자의 성능에 미치는 영향을 규명한 다. 또한, 제인자에 따른 기관성능의 변화추이가 편리하게 표시될 수 이씨는 일종의 성능선도(performance map)를 작성하고자 한다.