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몬테카를로 기법을 이용한 복합 시스템의 신뢰도 평가 알고리즘 개발에 관한 기초 연구
손영탁(Youngtak Son),김현준(Hyunjun Kim),서명원(Myungwon Suh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Recently, System is more complex. Accordingly, reliability assessment of system is more difficult. This paper is the research about complex system of reliability assessment algorithm that is difficult to analyze solution. If system has simple series structure or parallel structure in reliability block diagram, we can easily find analytical solution. But when system has very complex structure, we can't find analytical solution. In this case, we can assess system reliability using monte carlo simulation. This research represent reliability block diagram by adjacent matrix and define reliability path array and fault decision matrix. We can find any system status by comparing reliability path array and fault decision array. As a result, We can estimate system reliability through this process.
이용민(Yong Min Lee),손봉기(Bongki Son),서명원(Myungwon Seo),이혜원(Hyewon Lee),최재철(Jaecheol Choi),이윤주(Yunju Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Lithium secondary batteries have been widely used for mobile devices as a power source due to their highest energy density among various secondary batteries. Recently, they started to be applied to hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs). Comparing to small-sized lithium secondary batteries, largeformat lithium secondary batteries should have different cell chemistry and design for enhanced safety and high power characteristics. LiMn₂O₄ and amorphous carbon are newly used for cathode and anode materials owing to higher safety and performance, respectively. Moreover, the heat-resistive separator should be applied for vehicle application. However, the more important thing is that the electrode coating layer should be manufactured as thin as possible for tens of kW power requirement of HEVs with limited cell number less than 100. The cell reliability is also insured for about 10 years at low and high temperatures (-46~66℃).
고속도로 주행안정성 평가를 위한 시뮬레이터 DB개발 및 실험연구
김배영(Baeyoung Kim),신희종(Heejong Shin),손영탁(Youngtak Son),엄호영(Hoyoung Uhm),박경태(Gyeongtae Park),서명원(Myungwon Suh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Driver obtain an information by the visual over the 90% and provide an information by road sign. However the road sign system of highway has a driver's discomfort and traffic accidents by some possibility. Experiment of reality highway has a demerit that increased the traffic accidents and difficult to obtain the accurate an experiment result.Subsequently, this paper had an experiment for evaluation of highway driving safety for reduce the accidents factors to a highway design and developed the highway database was classed as original design and alternative design. Design of highway database was developed exactly like real highway and operated an experiment by driving simulator. Highway database was constructed compatible with DirectX by Multigen program. Four types of physiological (electrocardiogram, electromyography, electrooclulography, galvanic skin response) measurement was acted for 33 subjects using the Biopac equipment in the developed highway database. Also, analysis of driver's state was acted using a SWAT(Subjective Workload Analysis Technique), NASA-TLX(NASA-Task Load Index), MCH(Modified Cooper-Harper) among the psychological methods. Statistic analysis was operated for assure the result data reliability using the SPSS(Statistical Package for the Social Sciences) 12.0 program.
영구변형 저감을 위한 Cockpit Module의 가이드 위치 최적설계
조훈(Hoon Cho),김현준(Hyunjun Kim),손영탁(Youngtak Son),김혜경(Hyekyung Kim),김해룡(Haeryong Kim),서명원(Myungwon Suh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this paper, an analytical study to reduce permanent deformation in a cockpit module is presented. The analytical investigation utilizes a novel and practical methodology, which is implemented through the software tools, ABAQUS and iSight, for the identification and minimization of permanent deformation. Here, the emphasis is on evaluating the software for issues relating to the prediction of permanent deformation. The analytical results are compared with the experimental findings for two types of deformation location and the qualitative correlation is found to be very good. In this study, we also develop a methodology to design the guide and mount location of cockpit module for minimizing the permanent deformation. Nonlinear finite element analysis has been implemented and integrated with sensitivity-analysis techniques to minimize the permanent deformation at the areas of interest. Finally, we find the optimal guide and mount locations that reduce the permanent deformation.