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오태일(Tae Il Oh),이상준(Sang Jun Lee),김정순(Jong Soon Kim) 대한공업교육학회 1999 대한공업교육학회지 Vol.24 No.2
To identify the characteristics about the motion of a vehicle, it is often necessary that the inertia properties of the powertrain on the vehicle should be gained, and these values are very important data in the analysis of a vehicle dynamics. But it is not easy that we get the inertia properties of the powertrain for the complexity of the shape. This paper introduces the procedure to obtain the inertia properties using the approach of an experimental modal analysis. The properties of six rigid body modes are obtained by exciting the powertrain fixed in strong steel stands in low frequencies of the band 0 ∼ 40 Hz, and the inertia properties are derived from the values such as frequencies and mode shape vectors about the six rigid body modes. Several mathematical methods based on the theory of modal analysis are used to estimate the inertia properties. It is expected that this type approach will be used in increasing number applications during estimation of inertia properties for vehicle dynamics analysis.
모바일 하버 컨테이너 적재 유도 시스템에서 롤러 가이드 적용 및 해석
오태오(Tae-Oh Oh),박정홍(Jung-Hong Park),김광훈(Kwang-Hoon Kim),손권(Kwon Son) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.9
The purpose of this study is to evaluate a simulation model of a stacking guidance system (SGS) with a roller guide applicable to the mobile harbor. The study used a small-scale model (1/20) made of wood with rollers in order to compare the dynamic analysis with experiment results. The law of similarity was applied for the validation of the scaled model. In order to construct a more realistic simulation model, the damping coefficient of the dynamic model was adjusted to 0.5 Ns/㎜ for the wood-to-wood contact condition based on the experimental results. Using this validated model, dynamic simulations were also carried out for containers of 20, 30, and 40 tons. The results showed that the reaction force of the roller guide was increased from 74.7 kN to 91.2 kN as the weight of container increased. For the design of a roller guide for SGS, the results obtained in this study can be used to reduce the reaction force by employing a rubber roller or a highly damped rotational joint.
정규수업 전 스포츠활동 참여시 공감능력 및 친사회적 행동의 관계 분석
오태한,김덕중 한국웰니스학회 2019 한국웰니스학회지 Vol.14 No.4
이 연구는 정규수업 전 스포츠활동 참여에 따른 공감능력, 친사회적 행동의 변화를 살펴보기 위하여 실시하였다. 연구 대상자는 초등학교 5∼6학년 학생 123명을 대상으로 실시하였다. 연구대상은 실험집단(n=63)과 통제집단(n=60) 두 집단으로 구분하였고, 실험집단은 정규수업 전에 실시하였으며, 운동장에서 주 5회, 1회 운동 시 20~30분, 총 12주간 실시하였다. 정규수업 전 스포츠 활동이 학생들의 공감능력 및 친사회적 행동에 미치는 효과를 분석한 결과 다음과 같이 나타났다. 학생들의 공감능력을 파악한 결과 공감능력의 하위척도 중 공감적 각성과 공감적 관심에서 차이를 보였으며 친사회적 행동의 하위척도 중 도움주기, 위안하기 등에서 실험집단이 사전에 비해 사후에 유의하게 증가(p<.05)한 것으로 나타났고, 유의한 효과성(p<.05)을 보였다. 따라서 정규수업 전 규칙적인 스포츠 활동은 개인의 공감능력 및 친사회적 행동에 긍정적인 효과가 있는 것으로 판단된다. This study was conducted to investigate the changes in empathy and prosocial behavior according to participation in sports activities before regular classes. The subjects of this study were 123 grade 5∼6 students in elementary school. The study subjects were divided into two groups: experimental group(n=63) and control group (n=60). The experimental group was conducted before regular class. A total of 12 weeks. As a result of analyzing the effects of regular class sports activities on students' empathy and prosocial behavior, the results were as follows. As a result of understanding the empathy ability of students, there was a difference in sympathetic awakening and sympathetic attention among the subscales of empathy ability. Significantly increased (p<.05) and showed significant effect (p<.05). Among the subscales of prosocial behavior, there was a significant increase (p<.05) in the experimental group in helping and comforting. Therefore, regular sports activities before regular classes seem to have a positive effect on individual empathy and prosocial behavior.