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웨이트 트레이닝과 써키트 웨이트트레이닝의 부하강도가 체력에 미치는 영향
이성노(Lee Seong-No),이순천(Lee Soon-Cheon),백창식(Back Chang-Sick) 한국체육과학회 2003 한국체육과학회지 Vol.12 No.1
The purpose of this study is to analyze the influence of loading intensity of weight training and circuit weight training on physical fitness by comparing the exercise results of student groups. College of physical education-bound students were sampled for the study. The sample was divided into five groups. Four groups exercised three sets of weight training with the loading intensity 80%, 50% of 1RM each and three times of circuit weight training with the same loading intensity for eight weeks while the other group did not do any training. Weight and circuit training proceeded according to the elements of physical fitness such as power, agility, flexibility, muscular fitness, muscular endurance, speed which are usually estimated in most physical ability tests for admission to a college of physical education. In conclusion, both the tested four groups and the regulated group displayed some different increase in the record after exercising. However, there was no record difference revealed due to training method. It is considered that the weight training effect which weight training and circuit weight training have in common led to this result.
A study on the unloading modulus of Al-alloy foam
Tunvir, Kazi,Jeong, Gil-Do,Kim, Amkee,Cheon, Seong-Sick,Ahn, Byung-Wook 한밭대학교 생산기반기술연구소 2004 생산기반기술연구소 논문집 Vol.5 No.1
Behavior of unloading modulus of closed cell Al-alloy foam has been investigated through experiment and finite element analysis. Al-Si-Ca alloy foam having an isotropic material property Produced by melt based process was used in the evaluation of the behavior of unloading modulus of closed cell aluminum alloy foam. In the evaluation process a finite element analysis was accomplished for which a multiple cell finite element model having cruciform and hemispherical type cells originally proposed by Santosa et at. was used. The Santosa model was modified by introducing different wall thicknesses for cruciform and hemisphere cells on the basis of microstructural examination of the real foam cell wall structure. The elastic modulus of the form specimen has been found to increase with the monotonic compression. In case of finite clement analysis the unloading behavior of the monotonic compression also showed the same trend as the experimental result but with the discrepancy between finite clement analysis and experiment in low deformation range. This discrepancy may be associated with the different cell morphologics which caused the different deformation patterns of the cells. The influence of the loading condition on the unloading modulus was also studied by performing a compression-compression fatigue test measuring the unloading modulus by measuring the cyclic stress-strain during each fatigue cycle. In this case, the unloading elastic modulus showed a decreasing trend with increase of strain unlike in case of the monotonic compression.