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ISO 26262표준 대응을 위해 FTA를 이용한 소프트웨어 안전 분석 적용 방안
양동현(Donghyun Yang),김경훈(Kyounghoon Kim),정유진(Youjin Jeong) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
The recent rapid increase of electrical and/or electronic (E/E) controlled parts within road vehicles generated several risks such as systematic failures and random hardware failures caused by complex structures and high performance. In order to avoid those risks, functional safety is one of the key issues in the development of road vehicles. Functional Safety represents the approach to reduce the risk of harm to people to an acceptable level and ISO26262 standards are the functional safety related standards. ISO26262 standards provide the appropriate requirements and processes. As a part of the safety activities during the functional safety life cycle, ISO26262 standards require a software safety analysis at the architectural design level to identify the cause of failure and the effect of faults regardless of ASIL. The representative method for the safety analysis includes FMEA which is inductive analysis method and FTA which is deductive analysis method. In this paper, the general architecture design structure and analysis method of fault propagation path cause is presented and introduces an efficient software safety analysis method using the FTA to comply with the ISO26262 standards.
ISO 26262 기능안전 대응을 위한 종속 고장 분석 방법론
양동현(Donghyun Yang),김수현(Suhyun Kim),김윤탁(Yountak Kim),김경훈(Kyounghoon Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
The recent rapid increase of electrical and/or electronic (E/E) controlled parts within road vehicles generated several risks such as systematic failures and random hardware failures caused by complex structures and high performance. In order to avoid those risks, functional safety is one of the key issues in the development of road vehicles. Functional Safety represents the approach to reduce the risk of harm to people to an acceptable level and ISO 26262 standards are the functional safety related standards. ISO26262 standards provide the appropriate requirements and processes. As a part of the safety activities during the safety life cycle, ISO26262 standards require a dependent failure analysis to confirm the achievement the independence or freedom from interference and to mitigate the plausible dependent failures. In this paper, the identification method of dependent failures and the analysis method fault propagation path cause are presented and introduces an efficient dependent failure analysis method to respond to ISO26262 standards.
ISO 26262 기능안전 대응을 위해 FTA를 통한 효율적인 안전 분석 방법
양동현(Donghyun Yang),김수현(Suhyun Kim),김경훈(Kyounghoon Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
The recent rapid increase of electrical and/or electronic (E/E) controlled parts within road vehicles generated several risks such as failure modes caused by complex structures and high performance. In order to the risks from systematic failures and random hardware failures that may occur the electrical and/or electronic (E/E) systems within road vehicles, ISO26262 functional safety provides appropriate requirements and processes. In the performed safety activities during the safety life cycle, ISO26262 functional safety requires a qualitative safety analyses to identify the cause of failure and the effect of faults, and representative safety analysis methods include FMEA which is inductive analysis method and FTA which is deductive analysis method. In general, as a qualitative safety analysis method, FTA as highly recommendation is required when ASIL C or higher in ISO26262 functional safety, but it is necessary to perform FTA in ASIL A and ASIL B according to the functional safety requirements including DIA of each OEM. In this paper, the general architecture design structure and analysis method of fault propagation path cause are presented, and introduces an efficient safety analysis method through FTA to respond to ISO26262 functional safety based on the FTA methodology applying the P-S-C concept.
FMEA를 이용한 소프트웨어 안전분석에서 고장모드 선정에 관한 연구
양동현(Donghyun Yang),김경훈(Kyounghoon Kim),정유진(Youjin Jeong),김윤탁(Yountak Kim) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
The recent rapid increase of electrical and/or electronic (E/E) controlled parts within road vehicles generated several risks such as systematic failures and random hardware failures caused by complex structures and high performance. In order to avoid those risks, functional safety is one of the key issues in the development of road vehicles. Functional Safety represents the approach to reduce the risk of harm to people to an acceptable level and ISO26262 standards provide the appropriate requirements and processes for functional safety response. As a part of the safety activities during the functional safety life cycle, ISO26262 standards require a software safety analysis at the architectural design level to identify the cause of failure and the effect of faults regardless of ASIL. One of the representative methods for the software safety analysis is FMEA which is inductive analysis method and to perform the effective FMEA, the selection of failure mode is an important factor. In this paper, the selection method of failure modes using the HAZOP guide words and criteria for coexistence of elements is presented for an efficient software safety analysis to comply with the ISO26262 standards.
초효율성 모형을 이용한 지방의료원의 환경요인별 효율성 차이 분석
양동현(Donghyun yang) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.7
본 연구는 전국지방의료원연합회에서 발간하고 있는 경영평가통계편람에서 2005년부터 2009년까지 지방의료원의 운영실적자료를 이용하여 DEA의 CCR 모형, AP모형, superSBM 모형의 각 효율성을 측정하여 비교·분석하였다. 그리고 환경요인(지역, 종별형태, 운영형태, 교육수련여부, 수요와 공급여건, 의료급여 환자비율)별 superSBM 모형의 효율성의 차이를 확인하기 위하여 Willcoxon- Mann- Whitney 통계량을 이용하여 분석하였다. 분석결과, 첫째, SuperSBM 모형에서 15%∼17.1%, CCR 모형에서 13%∼15.5%, AP 모형에서 7%∼12.6%의 비효율을 보여 주고 있다. 둘째, 지역, 병원종별 형태, 병원운영형태, 수요와 공급여건, 저소득층의 진료비 비중 등 환경적 요인에 따라 효율성의 차이가 발생하였다. 셋째, 환경요인에 의해 발생되는 비효율을 해소하기 위해서는 병원내부의 독자적인 노력만으로 한계가 있으며 정부와 지방자치단체의 정책과 제도의 개선이 뒷받침되어야 한다. In the study, we estimate efficiencies using CCR model of DEA, Super efficiency(AP) model, and super-SBM model with the data of 32 regional public hospitals in Korea from 205 to 2009. With Wilcoxon-Mann-Whitney statistics, we analyze efficiency differences for environmental factors(regions, type of hospital, type of operations, type of education training, relative importanceof madicaids) among regional public hospitals. The results can be summarized as follows. Firstly, technical inefficiencies of regional public hospitals range from 15% to 17% in CCR model, 13% to 15% in AP model, 7% to 12.6% in SuperSBM model. Second, we confirm that environmental factors of hospitals cause different inefficiencies among them. The implication of this study is that policy and institutional change may need to improve the efficiencies along with internal managerial reform.
4D flow MR을 이용한 대동맥 역류 모사 모형의 속도장 측정에 관한 연구
이동현(Donghyun Lee),김종환(Jonghwan Kim),이현진(Hyeonjin Lee),하호진(Hojin Ha),양동현(Dong Hyun Yang),박한욱(Hanwook Park) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The introduction of 4D flow MR was expected to enable the simultaneous capture of fluid velocities, such as blood flow, alongside MRI scans. However, its reliability has fallen short of expectations, and ultrasound is still the preferred method for evaluating blood flow. A classification system for regurgitation jet flows into four typical cases has been introduced to address this issue. Particle Image Velocity Measurement (PIV) experiments have been used to estimate the precise velocity of regurgitation jet flows, which has been employed to validate the inaccurate velocity measurements of 4D flow MR. This paper aims to enhance the accuracy of blood flow rate evaluation by addressing the current limitations of 4D flow MR.
Malmquist 생산성지수와 Luenberger 생산성지수의 이론적 관계와 실증적 분석
박현숙 ( Hyunsuk Park ),양동현 ( Donghyun Yang ) 한국보건행정학회 2015 보건행정학회지 Vol.25 No.2
Background: We measured productivity changes of regional public hospitals using both global Malmquist productivity index?based on global production possibility set over all the periods? and the traditional Malmquist productivity index and analyzed the factors of productivity change. Methods: The data used in this study is two annual inputs and two annual outputs of 32 regional public hospitals in Korea from 2005 to 2009 and the results such as distances and Malmquist productivity index and global Malmquist productivity index are obtained by an R program written for this study. Results: The results can be summarized as follows. Firstly, technical efficiencies of regional public hospitals are affected largely by scale efficiency than pure technical efficiency. Second, productivity progressed and technological change has more significant influence on productivity advance over the period between 2005 and 2009. Third, the circularity problem of the traditional Malmquist index is confirmed, and so the global Malmquist index without this problem are valid for the analysis. Conclusion: Though this study also has some limitations with the data of regional public hospitals with a short time span, it is the first study of hospitals using global Malmquist productivity index and later it can be expanded to private hospitals and longer time periods.