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신장성 수축과 단축성 수축에 따른 등속성 트레이닝 효율성에 관한 연구
정용안 空軍士官學校 2001 論文集 Vol.48 No.-
The purpose of this study was to compare the efficiency of the eccentric and concentric(E/C) muscular training in the muscular strength(quadriceps femoris and hamstring muscle) increasement program. The subjects consisted 5 healthy men who were aged 20's years were divided into left leg concentric-right leg eccentric training group and right leg concentric-left leg eccentric training group. The training program was composed 30˚/sec, 60˚/sec for 5times, 3sets/day during 8wks training, the subjects were tested E/C strength of quadriceps femoris and hamstring muscles by use of cybex 770 system. The trunk flexion/extension tests were performed at 30˚/sec, 60˚/sec of angular velocity in the cybex. statistical analysis was performed usuing analysis of paired t-test. Results of this study are following : 1. The peak torques in the quadriceps and hamstring muscles were significantly increased by eccentric and contraction training. 2. The E/C peak torque ration in the quadriceps was significantly increased at 30˚/sec, 60˚/sec of angular velocity. 3. The E/C peak torque ratio in the hamstring muscle was significantly increased at 60˚/sec of angular velocity. In conclusion, the efficiency of eccentric muscle contraction was higher than concentric contraction. This means that the eccentric training is more suitable in the training of skeletal-muscular rehabilitation.
1,1,1 TCE 의 대체 세정제에 대한 세정 성능 비교
정용안,황영한,노경호 ( Yong An Jung,Young Han Hwang,Kyung Ho Row ) 한국공업화학회 1995 공업화학 Vol.6 No.6
Many alternatives to 1,1,1 TCE (1,1,1 trichloroethane) mainly used as cleaning solvent for metal parts are developed and commercialized because the solvent is scheduled to phaseout after 1996. Considering there are many kinds of parts and contaminants in metal cleaning, it is essential to investigating the characteristics and performance of the alternatives prior to use. For the contaminant of a cutting oil, Actrel 1047L and Solena vda which are the commercially available and promising alternatives were experimented at the same cleaning condition of 1,1,1 TCE to check the cleaning performance. The experimental results showed that the removal efficiency of 1,1,1 TCE was the lowest at the dipping cleaning condition, but it was better at the ultrasonic condition. Overally, the removal efficiency of Solena vda was better than that of Actrel 1047L for removing the cutting oil used in this experiment. But the small portion of spot was not entirely cleaned out with Solena vda, and its removal efficiency in terms of the number of experiments was worse than that of Actrel 1047L. Also trichloroethylene which is one of the conventional chlorinated solvents showed the smallest change in the removal efficiency.