• Nuclear industry
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• v.21 no.8 s.222
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• pp.14-25
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• 2001

• 대학교육
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• s.119
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• pp.106-115
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• 2002

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.4
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• pp.19-25
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• 2016

Engineering structures including civil infrastructures require a life-cycle cost and benefit during their service lives. The service life of a structure can be extended through appropriate inspection and maintenance actions. In general, this service life extension requires more life-cycle cost and cumulative benefit. For this reason, structure managers need to make a rational decision regarding the service life management considering both the cost and benefit simultaneously. In this paper, the probabilistic decision tool to determine the optimal service life based on cost-benefit analysis is presented. This decision tool requires an estimation of the time-dependent effective cost-benefit under uncertainty to formulate the optimization problem. The effective cost-benefit is expressed by the difference between the cumulative benefit and life-cycle cost of a deteriorating structure over time. The objective of the optimization problem is maximizing the effective cost-benefit, and the associated solutions are the optimal service life and maintenance interventions. The decision tool presented in this paper can be applied to any deteriorating engineering structure.

• Korean Journal of Comparative Education
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• v.24 no.3
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• pp.245-265
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• 2014

The purpose of this research is to find the features of HLC institutional accreditation model and the implication on the second period institutional accreditation of Korea. This research focus on accreditation model, accreditation period, comprehensive evaluation, criteria, decision making for accreditation status and accreditation supporting system. This research draws following suggestions to the second period institutional accreditation of Korea. 1. The institutional accreditation should apply various accreditation models according to the features of institute. 2. The institutional accreditation should focus on the autonomous quality improvement of institute with the quality assurance. 3. The quantitative evaluation should be reduced and qualitative evaluation based on mission and objects should be reinforced. 4. The interim evaluation should be strictly enforced for quality improvement. 5. The government should enlarge reflection the results of accreditation on financial aid to universities. 6. The web-based accreditation supporting system interworking with "Higher Education in Korea" service is needed.

• Journal of the military operations research society of Korea
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• v.32 no.2
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• pp.92-113
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• 2006

The main purpose of this study is to determine the optimal periodic inspection for Anti-Ship-Missile(Harpoon Block 1) fielding on Korea Navy Ship. In order to perform this study, the data from the Korea Navy (Harpoon maintenance & storage reliability) were collected from 1984 to 2004. Storage failure rate & MTBF for Harpoon block 1 were analysed by using mathematical model & reliability analysis software(Relex) and finally determined optimal periodic inspection. The suggested methodology will be used to determine and reevaluate the periodic inspection of Anti-Ship-Missiles for the Korea Navy.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.10a
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• pp.35-40
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• 1998

지구온난화에 영향을 미치는 온실효과 가스 배출을 저감해야 하는 세계적 규범 하에서 전력분야에서는 오염원의 배출 저감기술 개발에 노력해야 한다. 이러한 노력에 못지 않게 중요한 것은 배출원인과 양을 정확히 측정할 수 있는 능력의 배양이라 할 수 있다. 본 연구는 전력의 환경영향 정도의 평가에 있어 수명주기분석의 유용성을 인식하여 이에 따른 개념소개와 도입의 필요성을 피력하고, 이를 발전소의 전원별 환경영향 평가에 유용하게 적용할 수 있음을 사례분석을 통해 간략히 검증하였다.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.05b
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• pp.1061-1066
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• 1995

우리나라의 후행 원전연료주기 정책은 경제성이나, 기술성, 환경 영향 등 여러가지 계량, 비계량 지표들을 면밀히 분석하여 궁극적으로 국민의 복지와 민족의 번영에 이바지 할 수 있도록 선정되어야 한다. 본 논문에서는 AHP(Analytic Hierarchy Process) 방법을 후행 원전연료주기 정책 수립에 이용할 수 있도록 우리나라에서 가능한 후행 원전연료주기 시나리오의 몇가지 예를 제시하였으며, 정책 결정요소로서 에너지 안보와 경제성, 기술성, 국내 사회정치, 국제관계 등 5개의 주기준과 주기준에 종속되는 19개의 보조기준을 선정하였는데, 적절한 후행 원전연료주기 정책대안들을 선정하여 AHP 방법에 따라 정책결정기준들을 평가한다면 후행 원전연료주기 정책수립과정에 AHP 방법을 효과적으로 이용할 수 있을 것으로 기대된다.

• Journal of the Korean School Mathematics Society
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• v.23 no.3
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• pp.299-321
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• 2020

PISA, organized by the OECD, started with the worries about what competencies students need in preparation for a changing future society. Starting with the first main survey in 2000, PISA, which was administered every three years, is preparing for the eighth cycle. PISA 2022 is a cycle in which mathematics becomes the main domain in 10 years, and the definition of mathematics literacy, mathematical framework, and illustrative examples were released. Therefore, in this study, the definition of PISA mathematics literacy and the trends on the mathematical framework were examined, and the characteristics of the illustrative examples introduced together with the PISA 2022 mathematical framework were analyzed. Through this, implications were drawn for the successful implementation of the 2015 revised curriculum and assessment.

• Journal of the Korean Society of Propulsion Engineers
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• v.4 no.1
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• pp.93-101
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• 2000

In a gas-turbine engine, fan blades in flow path are confronted with many kinds of loading. The study of the excited force by the wake of struts has proposed and the possibility of fatigue failure about rotating fan blades by the excited force at the steady state is evaluated. Equations of the excited force of wakes has been derived at the steady state and the maximum pressure distributions measured at the transient state are proposed. Dynamic characteristics and the fatigue strength of fan blades by experimental test were obtained. To evaluate HCF(High Cycle Fatigue) damage of fan blades, FEM analysis was performed with a steady state harmonic response, which was followed by high cycle fatigue damage factor from goodman diagram.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.420-420
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• 2018

하천법에서 정의하고 있는 하천시설은 시설은 제방과 수문을 포함하여 20여종에 달한다. 이 중 하천유지 보수 매뉴얼(국토교통부, 2016)에서 정한 유지관리 대상은 총 14종이며, 국가 및 지방하천 정비와 유지관리에 4대강살리기사업 완료 시점인 2012년 이후 연간 약 1.3조원의 예산을 투입하고 있다. 연간 막대한 예산이 투입되어 관리되고 있는 하천관리의 효율성을 제고하기 위해 하천시설에 대한 생애주기관리기법적용 연구가 진행 중이며 이를 위해서는 하천시설의 성능에 대한 정확한 평가가 선행되어야 한다. 본 연구에서는 배수통문에 대한 성능평가모델을 산정하는 방법을 제시하였다. 우선적으로 배수통문의 설치년도와 시설물안전등급을 조사하고 등급별 평균사용연수를 산정하고 시설물 성능예측 기본식의 계수를 산정하여 성능평가모델 산정식을 도출하였다. 배수통문 성능평가모델 산정식과 등급별 평균 사용연수를 비교하여 산정식의 적용성을 검증하였다. 본 연구를 통해 하천시설의 사용연수에 따른 성능을 개략적으로 예측하여 유지관리예산 투입의 우선 순위를 결정하는데 기초자료로 활용이 가능하다고 판단된다.