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운동 참여자의 운동 동기와 지속성, 지각된 건강 상태에 관한 집단 특성 조사
권영두,이재혁 대한스포츠물리치료학회 2023 정형스포츠물리치료학회지 Vol.19 No.1
Purpose: In this study, we investigated group characteristics such as purpose, motivation, and perceivedhealth status of adults who participated in exercise across various periods and also describe exercise guidancestrategies to improve exercise participation and adherence based on the results of the survey and findingsof previous studies. Methods: The study included 69 participants who underwent short- or long-term exercise. Participants wereprovided a mixed questionnaire containing optional questions regarding the purpose of exercise participationand descriptive questions regarding their motivation for exercise participation. Perceived health status wasmeasured using a General Health Questionnaire. Results: Participants indicated muscle training (37.5%) and physical strength improvement (30.15%) as themain purpose of exercise, and the instructor (26.74%), self-realization (24.42%), and educational environment(13.95%) as motivators for exercise. Perceived health status severity and exercise persistence showed anegative correlation (R=-0.27) in contrast to exercise time per day (R=0.14) and the number of exercisesessions per week (R=0.07). Conclusion: Similar to the findings of previous studies, our study highlights that in contrast to external factors,exercise motivation for adherence should focus on improved intrinsic factors such as encouragement duringexercise coaching and that gentle guidance methods including goal setting should be used to improve exercisepersistence.
초기응력이 있는 일단고정 Plate Strip의 선형 및 비선형해석
權永斗,徐昌敏 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
The set of finite element equations of motion of an initially stressed elastic solid is derived by using the principle of virtual displacement. And this is compared with what obtained from Hamilton's principle. The set of equations of motion is applied to an initially stressed fixed-free plate strip on the sudden lateral loading condition at the free end. By comparing numerical result, we shall examine the effect of incremental stresses, and the selective reduction of the order of Gauss-Legendre quadrature.
5절점 상당요소에 의한 굽힘문제의 정적해석 및 자유진동해석
권영두,윤태혁,정승갑,박현철,Gwon, Young-Doo,Yun, Tae-Hyeok,Jeong, Seung-Kap,Park, Hyeon-Chul 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
In the present study, we consider modified 5-node equivalent solid element which has smallest degree of freedom among 2-dimensional solid elements accounting bending deformation as well as extensional and shear deformations, We shall investigate static and dynamic characteristics of this element, which is very effective in thin beam, thick beam, large displacement problems, beam of variable thickness, and asymmetrically stepped beam, etc., as well as relatively simple problems of beam. The degree of freedom of this element is 10, which is smaller than 18 of 9-node element, 16 of 8-node elemtns, 12 of modified 6-node element and Q6 element. Therefore, this element is expected to broaden the effective range of application of the solid elements in the bending problems further.
온도의 영향을 고려한 고압용 중공원주의 탄소성 응력 해석
權永斗 慶北大學校 産業開發硏究所 1980 硏究報告 Vol.8 No.-
Elastoplastic stresses in the hollow circular cylinder were analyzed using the finite element method. And the effect of temperature was considered. The elastoplastic stresses were computed in following two cases. 1st case: Uniform temperature distribution 2nd case: Nonuniform temperature distribution The autofrettage pressure of 2nd case was smaller than that of 1st case for a certain allowable pressure. So it was shown that the 2nd case is more useful in autofrettage process.
Al-Al_3Ni 複合材料의 비틀림特性에 관한 理論解析
權永斗,李永文,洪俊杓 慶北大學校 1980 論文集 Vol.30 No.-
The mechanical behavior of Al-Al_3Ni composites in torsion was analyzed. The Ludwik's equation S=Hγ^n was used as the shear stress and strain relation equation. The coefficients H and n were included in T-θ (torque-angle of twist) equation. The values of H and n were obtained by minimizing the errors between T-θ equation and the experimental data. The theoretical T-θ curves using computed values of H and n approach relatively well to the experimental data. Some discrepancy was observed in torque at a given twist angle with the solidification velocities. And so, an equation including the effect of solidification velocities was proposed without the experimental confirmation.
Autofrettage 가공시 2중중공원주의 최적두께비
권영두 경북대학교 공과대학 1980 工大硏究誌 Vol.9 No.-
The optimal thickness ratios of doubly laminated hollow cylinder were investigated. The Tresca's yield criterion was applied. In autofrettage process without shrink fit, the outer cylinder need not be autofrettaged. One equation can represent the allowable pressure. In autofrettage process with shrink fit, there are three equations representing allowable pressure concerned with the available autofrettage pressure. The optimal thickness ratio was obtained and same in above two cases.
Structural damage detection in continuum structures using successive zooming genetic algorithm
권영두,Hyun-Wook Kwon,김화중,Sim-Dong Yeo 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.2
This study utilizes the fine-tuning and small-digit characteristics of the successive zooming genetic algorithm (SZGA) to propose a method of structural damage detection in a continuum structure, where the differences in the natural frequencies of a structure obtained by experiment and FEM are compared and minimized using an assumed location and extent of structural damage. The final methodology applied to the structural damage detection is a kind of pseudo-discrete-variable-algorithm that counts the soundness variables as one (perfectly sound) if they are above a certain standard, such as 0.99. This methodology is based on the fact that most well-designed structures exhibit failures at some critical point due to manufacturing error, while the remaining region is free of damage. Thus, damage of 1% (depending on the given standard) or less can be neglected, and the search concentrated on finding more serious failures. It is shown that the proposed method can find out the exact structural damage of the monitored structure and reduce the time and amount of computation.