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강성후,최태근,박선준,김성일,Kang,Sung-Hoo,Choi,Tae-Geun,Park,Sun-Joon,Kim,Sung-Il 한국방재학회 2009 한국방재학회논문집 Vol.9 No.1
본 연구에서는 기존의 25 m 지간을 갖는 PSC I형 단순 철도교에 대해 고속 및 일반 열차하중으로 인한 동적거동을 분석하여 철도교량의 동적사용성을 평가하였다. 고유진동수는 8Hz 대역으로 평가되어 철도교량의 적정 고유진동수 범위 내에 들어있으며, 공진발생 가능성은 없는 것으로 나타났다. 가속도 응답은 무궁화호 열차 주행 시 제한 값 0.35 g를 초과하는 0.43 g가계측되었다. 또한 단부꺽임각은 고속철도의 설계기준을 만족하지 못하였으며 충격계수와 처짐은 모두 설계기준을 만족하였다. 결과적으로 25 m 지간을 갖는 PSC I형 단순 철도교의 경우 다양한 열차하중에 대하여 동적사용성을 부분적으로 확보하고 있는 것으로 나타났으나 진동가속도 응답을 감소시키기 위한 대책이 필요할 것으로 판단된다. In this study, dynamic serviceability of PSC, PreStressed Concrete, simple railway bridge with 25m span was estimated. All of the high speed and general train loads were considered at estimation. Natural frequency is estimated about 8Hz and includes within optimum natural frequency extent of the railway bridge. Also, the bridge was detected that resonance occurrence possibility does not exist. When travel the Moogunghwa train, acceleration response was measured to 0.43g that exceed limitation value 0.35g. Also, rotation angle of girders end did not satisfy design standard of railway bridge for high speed train, but impact coefficient and deflection satisfied design standard. As a result, that railway bridge was detected that is securing dynamic safety and serviceability partially, but methods to decrease vibration acceleration response are required.
테이핑이 맨몸 하프 스쿼트 세트에 따라 %MVIC에 미치는 영향
이경순(책임저자) ( Kyung Soon Lee ),강영호 ( Gyeong Ho Kang ),김가희 ( Ga Hui Kim ),이재송 ( Jae Song Lee ),이현지 ( Hyeon Ji Lee ),전진영 ( Jin Yeong Jeon ),정은식 ( Eun Sik Jeong ),조성희 ( Seong Hui Jo ),최태근 ( Tae Geun Choi ) 대한신경치료학회 2015 신경치료 Vol.19 No.2
Purpose This study is intended to examine an effect that taping has on %MVIC according to bodyweight half squat set exercise. Methods Participants in this study are composed of 10 male college students. Rectus femoris and erector spinae was measured by using surface electromyography. SPSS(version 20) was used through normalization process for electromyography data collected before ? after taping. And a paired t-test was used for comparison between before and after taping treatment, and one-way repeated measures ANOVA was used for comparison between sets. Statistical significance level was fixed at .05. Results Statistically significant difference was not shown in comparing MVIC befor e·after the treatment of taping applied on the rectus femoris and erector spinae. A statistically significant decrease was shown in muscle strength after taping in comparing %MVIC before·after the treatment of taping applied on the rectus femoris and erector spinae. A statistically significant increase was shown in %MVIC value in comparison between sets before the treatment of taping applied on rectus femoris No statistical difference was shown in %MVIC value according to each set before the treatment of taping applied on erector spinae. No statistical difference was shown in %MVIC value according to each set after the treatment of taping applied on erector spinae. Conclusion In comparison between before and after the treatment of taping applied on rectus femoris in bodyweight half squat, the taping was efficacious, and the efficacy of taping was shown in comparison between bodyweight half squat sets as well. The efficacy of taping was shown in comparison between before and after the treatment of taping applied on erector spinae. However, the efficacy of taping was not shown in comparison between sets. Accordingly, a change in the muscle strength of erector spinae requires experimental design where it is loaded with weight or the number of sets is increased.