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고교 단거리 육상 선수의 무산소성 예비량과 무산소성 운동능력의 상관관계
정진원 ( Jin Won Jeong ) 한국운동영양학회 2002 Physical Activity and Nutrition (Phys Act Nutr) Vol.6 No.2
The purpose of the study was to investigate relationship between anaerobic reserve (AR) from critical power test and anaerobic capabilities from Wingate and isokinetic test. Three different tests were administered to 12 high school sprinters on a Monark cycle ergometer and Kin-com isokinetic equipment. Means, standard deviations, Pearsons product-moment correlations, and simple linear regressions were obtained by using SPSS-Window program. To examine the important factors contributing to AR, stepwise regression analysis were performed using anaerobic capabilities from Wingnte and isokinetic tests as independant variables. Based on the findings of the study, the following conclusion has been derived: 1. There were significant moderate correlations of anaerobic reserve with WIN10, WIN20, and WIN30 respectively. 2. There were not significant correlations of anaerobic reserve with any isokinetic extensor and flexor variables. 3. The stepwise regression analyses revealed that only WIN30 contributed to predicting anaerobic reserve (72.9%) significantly. In conclusion, the results of the study demonstrated that the critical power test is a reliable and valid method for the measurement of anaerobic ability in the high school sprinters. The data suggested that anaerobic reserve assess true anaerobic ability not including the energy component of anaerobic glycolysis. Also, the study provides preliminary data on the anaerobic abilities in the sport of sprint as assessed by the critical power test, Wingate test, and isokinetic test.
대학 축구선수의 무산소성 예비량과 무산소성 운동능력의 상관성
정진원(Jin Won Jeong),심대용(Dae Yong Sim) 한국운동영양학회 2000 Physical Activity and Nutrition (Phys Act Nutr) Vol.4 No.1
N/A This study employed 11 university soccer players for assessing anaerobic capacities related to ATP-PC and/or lactate system. It was investigated correlation among anaerobic capacities from Critical Power test, from Wingate test, and from Isokinetic test. Also, the study investigated regression formula which could expect anaerobic reserve(AR) from variables measured in Wingate and Isokinetic test. There were significant but intermediate correlation between AR and WIN5, (r= .62, P< .05) and WIN30(r= .64, P< .05). There was no statistically significant but intermediate correlation between AR and WIN10 (r= .52, P> .05). The study used stepwise method for multiple regression by Wingate variables to produce AR. The result showed that WIN30 had significant effect and indicated regression formula (Y= 1.3323(WIN30)-14737.758) to explain 41.2% variation of AR. Stepwise method was done for multiple regression on Isokinetic variables to produce AR`s inferred possibility by extensors TW of 60˚ /sec as regression (Y= 10.6737 (TW)+2083.9403) explained 42.9% variation of AR. In the correlation between measured variables of Wingate and Isokinetic extensors there was no significance of intermediate correlation in 60˚ /sec PT and WIN5(r= .53, P> .05) and in TW and WIN5(r= .56 P< .05) statistically. Also, There was significance of intermediate correlation in PT and WIN10 (r= .65, P< .05), no significance in TW and WIN10 (r= .57, P> .05), in PT and WIN30(r= .58), and no significance in TW and WIN30(r= .46, P> .05). In the correlation between measured variables of Wingate and Isokinetic extensors, there was significance of intermediate correlation in 180˚ /sec PT and WIN10 (r= .69, P< .05) and significant correlation in Isokintic 180˚ /sec PT and WIN30(r= .65, P< .05). The data suggested that anaerobic reserve assess true anaerobic ability not including the energy component of anaerobic glycolyses. Also, the study provides preliminary data on the anaerobic abilities in university soccer players as assessed by the Critical Power test, Wingate test, and Isokinetic test.
냉간정수압 하에서 금속분말의 치밀화에 미치는 고무몰드의 영향
정진원,김기태,Jeong, Jin-Won,Kim, Gi-Tae 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2
The effect of rubber mold on densification behavior of pure iron powder was investigated under cold isostatic pressing. The thickness effect of rubber mold was also studied. The elastoplastic constitutive equation based on the yield function of Shima and Oyane was implemented into the finite element program(ABAQUS) to predict compaction responses of metal powder under cold isostatic pressing. The hyperelastic constitutive equation based on Moony-Rivlin and Ogden strain energy potentials was also employed to analyze deformation of rubber mold. The coefficients of the strain energy potentials were obtained from tension and volumetric compression data of rubber. Finite element results were compared with experimental data for densification of pure iron powder under cold isostatic pressing.