• 항공우주시스템공학회지
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• 제15권4호
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• pp.64-74
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• 2021

Unmanned Aircraft Systems (UAS) are rapidly emerging not only as a key military power, such as surveillance and reconnaissance for military purposes but also as a new air transportation means in the form of Urban Air Mobility (UAM). Currently, airworthiness certification is carried out focused on the verification of technical standards for flight safety suitability of aircraft design in accordance with the Military Aircraft Flight Safety Certification Act and does not employ the model for operational risk assessment for mission areas and airspace. In this study, in order to evaluate the risk of the mission area from the perspective of the UAS operator, a risk assessment simulation has been conducted by applying the Specific Operations Risk Assessment (SORA) model to the operating environment of the Korean military UAS. Also, the validity of the SORA model has been verified through the analysis of simulation results, and a new application plan for airworthiness certification of the military unmanned aerial system has been presented.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.488-493
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• 2004

This study discusses what determinants are important to enter the worldwide railroad market. Survey analysis is used to decide the determinants of export in the international railroad markets. The Study finds that with price factors, non-price factors such as technological innovation and technological transference are important, too. For manufacturing, market experience and know - how, financing and supports in the government level in the areas of strategical alliance and regulation are essential. For non-tariff factors, technical risk and characteristics of markets are considered.

• Nuclear Engineering and Technology
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• 제19권4호
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• pp.279-291
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• 1987

현재 원자력발전소의 확률론적 위해도 평가에 사용되는 사상 수목이나 고장수목 기법은 부품이나 계통의 이원적상태와 정적 묘사에 근거하고 있다 이 기법이 대부분의 안전해석에는 적합하지만, 요사이 점차 중요관심사가 되고 있는 발전소의 이용률 측정이나 기술 사양서 평가 같은 문제를 정확하게 다루기 위해서는 마코프 신뢰도 분석과 같은 보다 진보된 기법이 필요하다. 이 논문은 가압경수로의 원자로 보호계통을 위한 마코프 신뢰도 모델을 기술하고 기술사양서의 두 검사 절차를 분석한 결과를 제시한다.

• 대한인간공학회지
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• 제20권2호
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• pp.99-111
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• 2001

Human factors is a key issue in the maritime industry including ship design and navigation safety. Human factors for ship design is to optimize safety and convenience of crews and passengers. And human factors for navigation safety is to minimize marine accident occurrence by human and organizational error. There are several technical requirements to incorporate human factors and marine system Risk analysis. human behaviour analysis and human M&S(modeling and simulation) are examples of technical requirements. This paper provides the key issues and technologies of human factors for ship design and navigation safety.

• 산업경영시스템학회지
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• 제36권1호
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• pp.17-23
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• 2013

This study analyzed the efficiencies of Korean fisheries cooperative's 97 operation offices in the capital and surrounding area. We used the DEA model for checking the technical and scale efficiencies in the financial business of them. We divided the business into two parts, the productivity (efficiency for increasing deposit and loan) and profitability (efficiency for increasing the profit and reducing the risk from the loan). The results show that the additional profitability increase is very difficult because most of the offices have full technical efficiency for profitability. But additional analysis based on Slack-based Measure (SBM) DEA model shows that Kyung-Gi region can increase the profitability. SBM model analysis also gives us the possibility that customized policy can apply to each offices considering each factors affecting the productivity and profitability.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.794-799
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• 2006

For various historical reasons and some technical reasons, the safety of dams has been controlled by an engineering standards-based approach, which has developed over many years, initially for the design of new dams, but increasingly applied over the past few decades to assess the safety of existing dams. And some countries were asked for risk assessment on existing dam, which included structural, hydraulic safety of dam and social risk. So, Many countries were developed and could be adapted as an additional tool to assist in decision-making for dam safety management.

• Earthquakes and Structures
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• 제13권4호
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• pp.365-375
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• 2017

Seismic risk management has two main technical aspects: to recommend the construction of high-performance buildings and other structures using earthquake-resistant designs or evaluate existing ones, and to prepare emergency plans using realistic seismic scenarios. An overview of seismic risk assessment methodologies in Croatia is provided with details regarding the components of the assessment procedures: hazard, vulnerability and exposure. For Croatia, hazard is presented with two maps and it is expressed in terms of the peak horizontal ground acceleration during an earthquake, with the return period of 95 or 475 years. A standard building typology catalogue for Croatia has not been prepared yet, but a database for the fourth largest city in Croatia is currently in its initial stage. Two methods for earthquake vulnerability assessment are applied and compared. The first is a relatively simple and fast analysis of potential seismic vulnerability proposed by Croatian researchers using damage index (DI) as a numerical value indicating the level of structural damage, while the second is the Macroseismic method.

• 경영과정보연구
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• 제28권1호
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• pp.125-156
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• 2009

본 연구의 주목적은 1인 미디어 사용자의 만족과 몰입에 영향을 미치는 특성요인을 구체화시켜 보는 것이다. 이러한 연구목적을 달성하기 위하여 1인 미디어, 지각된 위험 및 상호작용성, 그리고 만족과 몰입 등에 관한 종합적인 문헌고찰 결과를 토대로 연구모델을 개발하였다. 본 연구에서는 1인 미디어 사용자의 만족과 몰입에 영향을 미칠 것으로 예상되는 특성요인으로 프라이버시 위험, 사회적 위험, 시간적 위험, 경제적 위험 등을 포함하는 지각된 위험과 능동적 통제, 양방향 커뮤니케이션, 반응성 등을 포함하는 지각된 상호작용성의 크게 두 가지 범주를 제안하였다. 설문조사 수행 결과, 1인 미디어를 사용해 본 경험이 있는 428명의 표본으로부터 응답자료가 수집되었으며, 이를 대상으로 SPSS 15.0과 AMOS 5.0 등의 통계패키지를 활용하여 요인분석, 신뢰성분석, 측정모델분석, 그리고 구조모델분석 등을 순차적으로 실시하였다. 본 연구의 가설검정 결과를 요약해 보면 다음과 같다. 첫째, 프라이버시 위험, 능동적 통제, 양방향 커뮤니케이션, 반응성의 네 가지 요인이 사용자 만족에 유의미한 영향을 미치는 것으로 밝혀졌다. 둘째, 프라이버시 위험, 시간적 위험, 경제적 위험, 능동적 통제, 양방향 커뮤니케이션의 다섯 가지 요인이 사용자의 몰입 정도에 유의미한 영향을 미치는 것으로 나타났다. 셋째, 1인 미디어 사용자의 만족은 몰입에 긍정적인 영향을 미치는 것으로 밝혀졌다. 분석 결과를 토대로 본 연구에서는 관련분야 연구자들을 위한 이론적인 시사점과 1인 미디어 활성화 및 마케팅 전략을 위한 관리적 차원의 함의를 논하였다. 마지막으로 본 연구의 한계점과 향후 연구방향을 제시하였다.

• 한국가스학회지
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• 제14권4호
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• pp.37-44
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• 2010

본 연구에서는 압력설비의 위험 원인분석 방법을 제시하기 위하여 API-581 절차에 의한 위험기반검사(RBI)에서 염산부식의 두께감소로 인한 사고발생 가능성을 해석하였다. 이를 위해 사고발생 가능성의 주요 인자인 기술종속계수(TMSF)를 산출하고, TMSF에 미치는 매개변수의 영향을 정량적으로 해석하였다. 그 결과, TMSF는 염화이온 농도와 온도가 증가할수록 증가하였으나, 설비두께, 검사횟수 및 검사유효성이 증가할수록 감소하였으며, 모니터링이 있는 경우와 과설계계수가 1.5배 이상인 경우에는 상당히 적은 값을 나타내었다. 이때, 검사횟수, 검사유효성 등급 및 과설계 계수의 크기에 따라 TMSF가 민감하게 변화하였으며, 모니터링은 TMSF의 크기만 변화시켰다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권24호
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• pp.10683-10690
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• 2015

The big gap between efficacy of population level prevention and expectations due to heterogeneity and complexity of cancer etiologic factors calls for selective yet personalized interventions based on effective risk assessment. This paper documents our research protocol aimed at refining and validating a two-stage and web-based cancer risk assessment tool, from a tentative one in use by an ongoing project, capable of identifying individuals at elevated risk for one or more types of the 80% leading cancers in rural China with adequate sensitivity and specificity and featuring low cost, easy application and cultural and technical sensitivity for farmers and village doctors. The protocol adopted a modified population-based case control design using 72, 000 non-patients as controls, 2, 200 cancer patients as cases, and another 600 patients as cases for external validation. Factors taken into account comprised 8 domains including diet and nutrition, risk behaviors, family history, precancerous diseases, related medical procedures, exposure to environment hazards, mood and feelings, physical activities and anthropologic and biologic factors. Modeling stresses explored various methodologies like empirical analysis, logistic regression, neuro-network analysis, decision theory and both internal and external validation using concordance statistics, predictive values, etc..