• 한국구조물진단유지관리공학회 논문집
• /
• 제2권4호
• /
• pp.194-200
• /
• 1998

Risk, probability of failure, which includes various uncertainties and influential factors of performance should be accounted for in engineering system. Recently, several different methods to analysis risk evaluation evolved and one of the practical method is FOSM (First Order Second Moment Method ). FOSM method is derived in terms of terms coefficient of variance to uncertainties which influence various factor. For risk evaluation and uncertainty analysis in hydraulic design system, load-capacity relationship is adopted in this paper. Sample catchment with design of sewer system is applied, which plots safety factor vs. risk. Risk evaluation and uncertainty analysis are very to important develop optimal design model in hydraulic system

• 한국건설관리학회논문집
• /
• 제1권1호
• /
• pp.53-62
• /
• 2000

본 연구는 건설 프로젝트의 초기 단계에서 미래에 발생할 수 있는 리스크를 리스크분할체계를 통하여 파악하고, 파악된 리스크를 효과적이고 체계적으로 분석 및 평가하여 프로젝트 초기단계에서 리스크를 분석하고 평가할 수 있는 절차와 계산틀을 제시하였다. 그에 따라, 프로젝트 기획 및 입찰 전 단계에서 건설공사 이행과정에서 발생할 가능성이 있는 리스크를 분석 및 평가하기 위해 FREES(Fuzzy Risk Evaluation Expert System)을 제안하였으며 가상 시나리오를 설정하여 모델에 대한 검증을 수행하였다. FREES는 기존의 IF-THEN 지식베이스를 사용한 전문가 시스템과 비교했을 경우 퍼지소속함수를 사용함으로써 규칙의 수를 현저하게 줄일 수 있으며 지식베이스의 구축과 변경 및 삭제 등이 용이하기 때문에 시간의 변화에 따라 다양하게 변화하는 리스크의 크기나 영향정도를 쉽게 반영할 수 있다.

• Journal of Platform Technology
• /
• 제9권2호
• /
• pp.10-25
• /
• 2021

정보보안에 있어서 온-프레미스의 환경에서 위험분석평가에 대한 많은 연구가 진행되었지만, 클라우드컴퓨팅 시스템에 대한 위험분석평가의 효과적인 방법론에 대한 연구는 많이 부족한 실정이다. 2015년 클라우드컴퓨팅 발전법이 제정되어 클라우드컴퓨팅 도입 촉진 계기가 되었다, 그러나 클라우드컴퓨팅 시스템의 보안사고 증가 등의 이유로 활성화가 미진한 상황이다. 또한, 클라우드컴퓨팅 시스템을 도입하려는 관련 담당자의 클라우드컴퓨팅 시스템 기술 이해의 어려움 때문에 적극적으로 도입이 이루어지고 있지 않은 상황이다. 이에 관하여 이 연구는 클라우드컴퓨팅 시스템이 가진 특성과 개념, 그리고 모델을 살펴보고 이러한 특성이 위험분석평가에 어떻게 영향을 미치는지를 분석하여 효과적인 위험분석평가 방법을 제시하였다.

• 한국안전학회지
• /
• 제24권3호
• /
• pp.96-101
• /
• 2009

In this study, a risk-appearance frequency evaluation model for railway level-crossing accidents is developed with the frequency estimation based on the accident history. It follows the worldwide common safety management approach and reflects the operation conditions and accident properties of the domestic railway system. The risk appearance frequency evaluation process contains a development of accident scenarios by defining the system configurations and functions, and a frequency estimation of hazardous events based on the accident history. The developed model is verified with the accident history during 5 years('03-'07) for 3 hazardous events: 'Being trapped in level crossing(Hl)', 'Crossing during warning signal(H2)' and 'Breaking through/detouring the barrier(H3)'. This risk appearance frequency evaluation model will be combined with a consequence evaluation model so as to offer full risk assessment for the railway accident. The accident risk assessment will contribute to improving the safety management of the railway system.

• Safe Food
• /
• 제8권1호
• /
• pp.36-40
• /
• 2013

• The Journal of Asian Finance, Economics and Business
• /
• 제9권8호
• /
• pp.89-97
• /
• 2022

The e-commerce market faces significant credit risks due to the complexity of the industry and information asymmetries. Therefore, credit risk has started to stymie the growth of e-commerce. However, there is no reliable system for evaluating the creditworthiness of e-commerce companies. Therefore, this paper constructs a credit risk evaluation index system that comprehensively considers the online and offline behavior of online retail enterprises, including 15 indicators that reflect online credit risk and 15 indicators that reflect offline credit risk. This paper establishes an integration method based on a fuzzy integral support vector machine, which takes the factor analysis results of the credit risk evaluation index system of online retail enterprises as the input and the credit risk evaluation results of online retail enterprises as the output. The classification results of each sub-classifier and the importance of each sub-classifier decision to the final decision have been taken into account in this method. Select the sample data of 1500 online retail loan customers from a bank to test the model. The empirical results demonstrate that the proposed method outperforms a single SVM and traditional SVMs aggregation technique via majority voting in terms of classification accuracy, which provides a basis for banks to establish a reliable evaluation system.

• Geomechanics and Engineering
• /
• 제8권5호
• /
• pp.631-647
• /
• 2015

Engineers may encounter unpredictable cavities, sinkholes and karst conduits while tunneling in karst area, and water inrush disaster frequently occurs and endanger the construction safety, resulting in huge casualties and economic loss. Therefore, an optimal classification method based on grey system theory (GST) is established and applied to accurately predict the occurrence probability of water inrush. Considering the weights of evaluation indices, an improved formula is applied to calculate the grey relational grade. Two evaluation indices systems are proposed for risk assessment of water inrush in design stage and construction stage, respectively, and the evaluation indices are quantitatively graded according to four risk grades. To verify the accuracy and feasibility of optimal classification method, comparisons of the evaluation results derived from the aforementioned method and attribute synthetic evaluation system are made. Furthermore, evaluation of engineering practice is carried through with the Xiakou Tunnel as a case study, and the evaluation result is generally in good agreement with the field-observed result. This risk assessment methodology provides a powerful tool with which engineers can systematically evaluate the risk of water inrush in karst tunnels.

• 한국정보과학회논문지:시스템및이론
• /
• 제34권7호
• /
• pp.282-287
• /
• 2007

정보시스템을 이용하는 금융, 무역, 의료, 에너지, 교육 등 사회 각 분야에서 정보화가 급속하게 진전되고 있다. 정보시스템에 대한 보안관리는 위험분석평가가 선행 되어야하며, 보안위험분석은 요구되는 정보보호서비스의 취약점을 해결하고 위협으로부터 시스템을 안전하게 관리할 수 있는 최선의 방법이다. 본 논문에서는 최적의 평가계획을 수립한 수 있는 평가사례기반추론 기능을 모델링하였다. 평가 사례기반추론(case-based reasoning) 기능은 보안위험분석평가를 프로젝트단위로 관리하며, 기존의 평가사례 간유사도를 평가하고, 유사한 평가 사례를 바탕으로 최적의 보안위험분석평가 계획을 수립할 수 있다.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
• /
• pp.83-88
• /
• 2006

Evaluation of collision risk plays a key role in developing the expert system of navigation and collision avoidance. This paper presents a new collision risk model formula that is one modification model on the basis of one approach to the evaluation of collision risk using sech function produced by Prof. Jeong in his relevant $articles^{[2][3][4][5]}$. And as a grope in collision risk evaluation field, this paper applied the new model in appraising the collision risk, suggested how to decide the safe range of own ship’'s action. Moreover this paper also analyzed theoretically how to determine the coefficients as describes in the new modification model formula, and suggested the appropriate values as applicable.

• 수산경영론집
• /
• 제39권3호
• /
• pp.1-23
• /
• 2008

Recently, traceability systems are introduced as a new food safety information system. To trace food products efficiently, they must have an automatic identification capability at the individual product level. This capability can be gained through RFID technology. But there is not yet any performance evaluation tool on RFID-based traceability systems (RFID-TS). This study developed an evaluation tool of RFID-TS. To develop the tool, this study considered the objective and the components of RFID-TS as their performance constructs. According to Churchill's paradigm, the tool was established through two stages. The final evaluation tool consisted of four constructs (risk, operational benefits, IS (information system), and network) and nine sub-constructs. Among the four constructs, risk and IS were found as the most important performance constructs through regression analysis. Among the nine sub-constructs, service (which belonged to the IS construct) and economic risk (which belonged to the risk construct) were found as the most important performance sub-constructs.