http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Tire Tub 강성 개선을 위한 Rear Floor Rear 형상 최적화에 대한 연구
김상기(Sanggi Kim),임성식(Seongsik Lim),이상진(Sangjin Lee),이창건(Changkun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this paper, new methods and procedures are considered for improving spare tire tub stiffness that is related to vehicle durability. First, we found out optimized bead shape for rear floor rear by topography analysis and additionally made a study on panel thickness and curvature shape for securing the higher level stiffness. In base on this study we secured 2~4 times higher stiffness than spare tire tub stiffness with minimum mass increase.
역문제에 의한 9Cr-1Mo강의 SP-크리프와 일축인장크리프의 상관성 및 수명예측
김상기(Sanggi Kim),양성모(Sungmo Yang),유효선(Hyosun Yu),강희용(Heeyong Kang),박정은(Jungeun Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Most of the structural analysis are tested under uniaxial stress or small punch test. but there are also need to inverse problem to study relationship of these. The focus of this paper is to investigate the relationship between the small punch creep test and uniaxial creep test by inverse problem tool. Specimen is adopted 9Cr1MoVNb steel. Creep test were performed using a SP-Creep test at constant loads and high temperature conditions. To find the relationship of Uniaxial creep, FEM were also conducted at the same condition of SP-Creep test. From the basis of relationship of test results, the optimum size of specimen and inverse problem validity were determined. The last, creep life is predicted by using the modified power law.
하중속도에 따른 SP시험과 FEM해석에 의한 중력주조 AM60B 거동 특성
김상기(Sanggi Kim),양성모(Sungmo Yang),유효선(Hyosun Yu),송준혁(JoonHyuk Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Magnesium alloy is the material in which the lightness, the specific strength , the non-rigid, the damping capacity and the shielding. Also it have various strength such as the high effectiveness and the energy-saving of machinery. In recent years, the concern about magnesium alloy increases and the lightness necessity in automotive industry enlarged. So it is considered as the material that can replace the aluminium alloy. Therefore, this research purpose is to see the behavior characteristics of lightweight magnesium AM60B with good property. We deducted fracture deformation and energy by conducting SP test in room temperature and at load speed 0.2, 2, 20㎜/min. Also we understand microstructure and fracture plane through scanning electron microscope and optical microscope. And we design widely used vehicle inner door panel and implement finite element analysis base on data derived from sp test. As a result, according to load speed, we catch the different of AM60B magnesium deformation behavior. we see that the gap of strength is not only denpend on the size of impact bar and braket but also the load speed as important parameter.
모바일 기기에서 공개 API 를 통한 신원 증명 서비스의 문제점 분석
김상기(Sanggi Kim),유민수(Minsoo Ryu) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
공인인증서의 독점적 지위가 폐지됨에 따라 사설 인증서가 대안으로 떠오르는 상황에서 블록체인과 DID(Decentralized Identifier)를 결합한 신원 증명 서비스가 주목받고 있다. 하지만 신원 증명 서비스의 접근성이 용이해짐에도 불구하고, 개인정보보호 문제가 발생하고 있어 그에 대한 개선방안이 요구되고 있다. 본 논문에서는 모바일기기를 활용한 신원 증명 서비스에서의 인증 과정과 개인정보보호 측면에서의 문제점을 분석하여 신원 증명에 사용되는 정보와 취약점을 알아보고 그에 대한 해결 방법을 제안한다.