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RISS 인기검색어
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- 저자 : 김성현 ( Sunghyun Kim ) (검색결과 151 건)
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비선형 유한요소해석 프로그램을 이용한 차체 구조물의 동강성 및 정강성 해석
김성현(Sunghyun Kim),김형일(Hyungil Kim),변형배(Hyungbai Byun),김동석(Dongseok Kim),이용훈(Yonghoon Lee),김일환(Ilhwan Kim),허승진(Seung Jin Heo),임홍재(Hong Jae Yim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, dynamic stiffness analysis and static stiffness analysis were conducted by using nonlinear finite element analysis program and linear finite element analysis respectively to compare the results and to confirm reliability about results of nonlinear finite element analysis program. First, dynamic stiffness analysis has been performed on side out panel, crash box, sub-frame and BIW(Body In White) that has been connected with front bumper, rear bumper and sub-frame. Second, static stiffness analysis has been conducted on crash box and hood that has been modeled with spot weld elements and rigid body elements. Consequently, differences of dynamic and static stiffness analysis results through nonlinear finite element analysis program and linear finite element analysis were below 6 % but difference was more than 6 % as to dynamic stiffness of BIW.
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부모-자녀 간 의사소통 훈련이 중학생의 또래관계기술 및 학교적응에 미치는 효과
김성현(Kim, Sunghyun),백현옥(Baek, Hyunok) 한국학부모학회 2021 학부모연구 Vol.8 No.3
이 연구에서는 부모-자녀 간 의사소통 훈련이 중학생의 또래관계기술 및 학교적응에 미치는 효과를 알아보기 위해 연구가 진행되었다. 본 연구에서는 다음과 같이 연구문제를 설정하였다. 첫째, 부모-자녀 간 의사소통 훈련은 중학생의 또래관계기술에 어떠한 효과 있는가이었고 둘째, 부모-자녀 간 의사소통 훈련은 중학생의 학교적응에 어떠한 효과가 있는가이었다. 본 연구에서의 대상은 G시 소재 중학생 학부모 22명과 중학생 22명이었다. 조사도구로는 또래관계기술척도와 학교적응척도를 사용하였고, 분석방법으로는 빈도, t-검증, 공변량분석(ANCOVA)을 실시하였다. 본 연구의 결과를 살펴보면 첫째, 부모-자녀 간 의사소통 훈련이 중학생의 또래관계기술을 증진시키는 것으로 나타났다. 둘째, 부모-자녀 간 의사소통 훈련은 중학생의 학교적응력을 증진시키는 것으로 나타났다. 이 연구를 통해 부모-자녀 간 의사소통 훈련과 중학생의 또래관계기술, 학교적응과 관련하여 교육현장에서의 시사점을 제공한다고 볼 수 있다. The study was conducted to investigate the effect of parent-child communication training on peer relationship skills and school adaptation of middle school students. The research questions were set as follows. First, what effect did parent-child communication training have on the peer relationship skills of middle school students, and second, what effect did parent-child communication training have on middle school students school adaptation. The subjects of this study were 22 parents of middle school students in G city and 22 middle school students. The peer relationship skill scale and school adaptation scale were used as research tools, and frequency, t-test, and covariate analysis (ANCOVA) were performed as analysis methods. Looking at the results of this study, it was found that parent-child communication training improves the peer relationship skills of middle school students. Second, parent-child communication training was found to enhance middle school students ability to adapt to school. It can be seen that the results of this study provide implications in the educational field regarding communication training between parents and children, peer relationship skills of middle school students, and school adaptation.
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분산전원시스템에 적합한 에너지 저장장치의 급속충전에 관한 연구
김성현(Kim Sunghyun),안상용(Sang Yong An),안창덕(Chang Doeuk An),윤영삼(Young Sam Yoon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
본 논문에서는 분산전원시스템의 에너지 저장장치로 널리 사용되는 Lead-Acid 배터리에 대한 특성을 나타내었다. 기존의 정전류-정전압 충전과 Step-Down 정전류 충전의 비교 실험을 통해 Step-Down 정전류 충전 시 가스발생을 최소화하고 급속충전이 가능함을 나타내었다.
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저속 충돌 성능 만족을 위한 Bumper system 개발 과정에 관한 연구
김성현(Sunghyun Kim),권율(Youl Kwon),노기훈(Kihoon Noh),김용석(Yongsuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In general, the role of the low-speed vehicle bumper is to absorb the impact during a collision and protect the vehicle with its occupants. In order to evaluate the efficiency of the bumper, each country must follow some domestic and international low-speed bumper impact standards and specifications to determine damaged regions. But it is only a consultation or confirmation and not actually the regulation of the efficiency of the bumper. Most automobiles evaluate the balance of the development stage of the bumper with the resultant price of completion which should not yield to a many difference. In this paper, we propose to automobiles possible conditions for an impact test of the low-speed vehicle bumper with great value results.
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치과 LED 광원모듈의 시각적 평가를 위한 연색지수 분석
김성현(SungHyun Kim),김재열(JaeYeol Kim),최승현(Seung-Hyun Choi),정연오(YeonOh Jung),홍기태(GiTae Hong) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The focus transform type of dental LED light source that performed high color rendition LED light source module applicate to white LED instead of halogen lamp used previous light source. Thus, it has to decide the teeth color when the treatment is performing to dental resin or dental prosthesis in the dentist. The focus transform type(high color rendition LED light source module) and halogen lamp methods to perform the patient's oral cavity. We performed analyze to CRI according to color and color guide of the patient. It performed that the lighting effect from color distinction and we got such this results.
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김성현(Sunghyun Kim),권기한(Kihan Kwon),민승재(Seungjae Min) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
To extend the driving range of electric vehicles, various studies to maximize the driving efficiency such as optimization of driving force distribution are performed. Because an electric vehicle can recover energy through regenerative braking, it can be optimized to minimize energy consumption. However, because braking is directly related to the safety, it is required to achieve stable braking by distributing torque to the front and rear wheels. The maximum torque of the motor may not satisfy the required braking force, so hydraulic braking force can be required. In this study, the regenerative braking force distribution is optimized within the range of securing the braking stability of the vehicle by considering ideal braking force distribution and ECE regulations for braking. Modeling and simulation of front and rear axle independently driven electric vehicles is carried out, and the driving force and braking force are optimized. It is designed to satisfy the required braking force by the regenerative braking of the motor and support of the mechanical braking when needed. Through the WLTP cycle simulation, it is confirmed that the SOC consumption is decreased compared with the braking force distribution based on the I-Curve.
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