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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.
대학체육 시간강사의 직무 스트레스와 직무 열의의 관계 : 극복력의 매개 효과검증
오태한(Oh, Tae-Han),김덕중(Kim, Duk-Jung) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.5
The purpose of this study was to verify the mediated effects of coping power in the relationship between job stress and job enthusiasm of college sports part-time lecturers. The participants were collected from 215 part-time lecturers majoring in physical education, either from a physical education college or from a liberal arts college, using the method of extracting snowballs. Survey tools were used by modifying and supplementing questionnaires used in prior research. Considering the characteristics of part-time lecturers, researchers and research assistants visited the data in person to collect the data considering the time and location of the participants of this study. The collected data were frequency analysis, factor analysis, correlation analysis, simple regression and multiple regression analysis through the SPSS statistical program, and the significance verification of indirect effects was utilized by the Sobel test technique. The results were as follows. First, job enthusiasm the job stress of college sports part-time lecturers had a negative (-) effect on job enthusiasm. Second, in the relationship between the job stress and job enthusiasm of a physical education-related part-time lecturer, the coping power was a complete mediated model. Through this study, it would be expected to derive various follow-up studies that could alleviate the job stress of college sports part-time lecturers and improve their job enthusiasm.
오태동(Tae Dong Oh),이준수(Jun-Soo Lee),오재인(Jay In Oh) 한국IT서비스학회 2010 한국IT서비스학회지 Vol.9 No.4
The purpose of this study is to investigate the relationship among users perception on the characteristics of U-Services, attitude factors as mediating variables, and behavioral intention toward U-Services as the dependent variable. Based on the literature review on the related theories, the research model which analyzes the behavioral intention toward U-Services was developed. The result from the analysis of the data collected validated the U-Services Acceptance Model (USAM) proposed in this study as a sound construct framework. Futhermore, significant insights on the USAM were provided for the stakeholders and future researchers in the field of U-Services Acceptance.
일체형 곡물 건조/저장 시스템 개발을 위한 나선형 배출기구의 가변 단면 형상 설계에 관한 연구
최갑용(Choi, Kab-Yong),오태일(Oh, Tae-Il),신성호(Shin, Sung-Ho) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.7
본 연구는 저비용 고효율의 일체형 곡물 건조/저장 시스템 개발을 위하여 추진되었다. 저장시스템의 용량 과 규격, 배출기구의 설치 조건 및 공전, 자전 등의 운전 조건 그리고 대상 곡물의 비중 등의 다양한 조건에서 정 해진 배출속도를 충족시키며 곡물의 선입-선출이 보장되는 균일하강 배출기구를 설계하고자 하였다. 곡물 배출 과정 에 대한 육안 관찰이 가능한 장치를 제작하여 기존의 균일 단면형 배출기구에서의 곡물의 배출 거동을 관찰하여 기 존 기구의 제한점을 검토하였다. 수학적 해석을 통해 주어진 배출 속도를 비롯한 다양한 조건과 곡물의 균일 하강 의 조건을 만족시키는 가변 단면형 배출기구의 단면형상을 설계할 수 있는 일반화된 공식을 유도하였으며, 이를 적 용하여 제작된 시작품의 운전을 통해 계산값과의 비교 검증의 연구 과정을 수행하였다. 이를 통해 주어진 다양한 조건을 만족하는 나선형의 가변 단면형 균일하강 배출기구의 단면 형상 설계를 위한 일반화된 수학적 모델을 개발 하였다. This study have been carried out as a part of R&D project to develop a low cost high efficiency combined grain drying & storage system. The design of sweeping auger must meet the various conditions : capacity and dimensions of silo, discharging capacity of auger, operation conditions of auger such as revolution and rotation and density of grains and even the first-in & first-out of grains in the system. Through the experimental observations with the apparatus which enables the direct observation of discharging behavior of grains, the limitations of the performance of existing straight type auger was observed. Generalized mathematical model for the profile of new variable section sweeping auger was obtained, which ensures the uniform descending of grains and also meets various operating conditions. The experimental results with a prototype sweeping auger showed that the mathematical model for the variable section sweeping auger was quitely correct.
가변단면 Sweeping Auger의 유동량 해석에 관한 연구
최갑용(Choi, Kab-Yong),오태일(Oh, Tae-Il),신성호(Shin, Sung-Ho) 한국산학기술학회 2009 한국산학기술학회 학술대회 Vol.- No.-
본 연구는 일체형 곡물 건조/저장 시스템 개발에 사용되는 Sweeping Auger의 성능 개선을 위하여 추진되었다. 이를 위하여 본 연구에서는 Variable Section Sweeping Auger를 제안하고 그 특성을 해석할 수 있는 수식모형을 개발하였다. 이를 통하여 곡물 건조 저장시스템의 성능개선에 이바지 하고자 한다.