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원종일,석창성,김수용,김동중,안하늘,박은수 한국산업안전학회 1999 한국안전학회지 Vol.14 No.4
In this study, theoretical stress field analysis near the crack tip under tension-compression loading was performed. The results of the theoretical stress analysis were compared to the results of Finite Element Method(FEM). From this study, generation of tensile residual stress at crack tip was proved after 1-cycle of tension-compression loading, and the fracture toughness and the fracture load of a structure can be decreased by the residual stress.
석창성,구재민,김동중,안하늘,박은수 한국산업안전학회 2000 한국안전학회지 Vol.15 No.4
The remaining life estimation for the aged components in power plants as well as chemical plants are very important because mechanical properties of the components are degraded with time of service exposure in the high temperature. Since it is difficult to take specimens from the operating components to evaluate mechanical properties of components, accelerated aging technique are needed to estimate and analyse the material degradation. In the this study, test materials with 4 different degradation levels were prepared by isothermal aging heat treatment at 630℃. And tensile test, K_(IC) test, hardness test and Scanning Electron Microscope analysis were performed in order to evaluate the degradation of 1Cr-1Mo-0.25V steels.
PNF 상지패턴에 기초한 진동운동기구 훈련이 노인의 체간 안정성과 균형에 미치는 영향
이형수 ( Hyoungsoo Lee ),임정대 ( Jungdae Im ),이기훈 ( Gihun Lee ),이지성 ( Jiseong Lee ),이진욱 ( Jinwuk Lee ),손지윤 ( Yeonju Seo ),서연주 ( Jiyoon Son ),안효정 ( Hyojoeng An ),오현정 ( Hyunjeong Oh ),윤하늘 ( Haneul Youn ),이서연 대한통합의학회 2015 대한통합의학회지 Vol.3 No.3
Purpose : This study examines the effect of vibration exercise grafting PNF patterns for 6 weeks on upper body stability and equilibrium for seniors having fifteen or over of MMSE-K. Method : A total of 10 senior citizens participated in this study. Each participant performed PNF patterned exercises using vibration sports equipment for 30 minutes, once static a week, for six weeks. We measured trunk stability and balance degree before and after the six-week exercise program. Motor Assessment Scale (MAS) was used to measure trunk stability, while Functional Reach Test (FRT) and Timed Up and Go (TUG) was used to measure balance degree. The collected data was processed using paired t-test to confirm the difference between pre-program conditions and post-program conditions. Results: The results of our study show that post-program trunk stability measurements increased when compared to pre-program data; however, this increase was not statistically significant. pre and post-measurements for satatic balance and dynamic balance were statistically unchanged. Conclusion: Due to limitations in the number of participants, the procedural design of this experiment, and the limited amount of time participants actually controlled, this study failed to produce statistically significant results. However, further study should be conducted using a systematically implemented exercise program to show support for exercising with flexi-bar as an effective program for the elderly.