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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.
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.
DC 서보모터를 이용한 나노튜브 제조용 압축-절단 장치의 토크 안전성에 관한 연구
최갑용(Choi, Kab-Yong),오태일(Oh, Tae-Il) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.12
본 연구는 나노튜브 제조시스템의 주요 구성요소인 압축-절단 장치가 안전한 성능을 발휘할 수 있도록 설계 하는데 목적이 있다. 나노튜브의 제조에 있어서 가장 중요한 핵심기술은 튜브에 나노물질을 주입한 후 압력을 가하여 안전하게 봉합하고 전단분리 하는 것이다. 이 때 작용하는 압력과 속도가 나노튜브의 품질을 결정한다. 본 연구에서 는 DC서보모터에 의하여 구동되는 압축-절단 장치의 구동력을 설계하고 이를 바탕으로 시스템을 제작한 후 시제품을 생산하는 과정을 보이고자 한다. The compressing-cutting device is used for manufacturing nano tube. the purpose of this study is to design and manufacture the compressing-cutting device witch has safety and stable performance. The most important core technology, in nano tube manufacturing, is to seam the each end of tube with appropriate pressure and to cut it off into the two part safely not to leak injected medium. Since the compressing pressure and the cutoff speed make the quality of nano tube, they are very important. This study will show the processes of design and manufacturing of compressing-cutting device.