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태권도 공격 시 돌려차기와 받아차기 시 돌려차기 동작의 지면반력 비교분석
윤주식(Yoon Ju-Sik),최명수(Choi Myung-Soo),하철수(Ha Chul-Soo) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.2
During Taekwondo kyorugi the dollyochagi is a practical and very fast kick while the defender can respond to it in various methods and it can be used effectively to gain points. The push off the ground with the kicking foot it is one of the decisively important variables that affects the speed of the kick while rising the body up towards the defender. The purpose of this study was to do a comparative analysis and provide scientific data regarding the dollyochagi ground reaction forces of 4 skilled and 4 unskilled Korean players that are registered with the Korean Taekwondo federation in 2010. To summarize the analysis for the two groups mentioned above, the unskilled group were not able to use their right foot maximum ground reaction force during the padachagi effectively as the skilled group. During the badachagi if the force in the vertical direction is high then the landing foot can be late and the defenders reaction can be reduced as they move backwards with their COM moving more and they can fall over, but for more than a stronger impact it is important to focus on a faster more safe impact with stability training to development of a kick that can be combined with other kicks needs to be practiced.
플라즈마 전해 산화 표면처리 된 AZ31B 소재의 표면 조도 및 광학적 특성연구
유재인,윤주식,윤재곤,김진희,최순돈,유재용,장호경,김기홍,Yu, Jae-In,Yun, J-S,Yoon, Jae-Gon,Kim, Jin-Hi,Choi, Soon-Don,Yu, Jae-Yong,Jang, Ho-Kyeoung,Kim, Ki-Hong 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.4
The surface oxidation of magnesium was performed by Plasma electrolytic oxidation treatment method. And the optical reflectance spectra of the oxidation layers are studied. In the PEO process, the growth of the oxide layer take place at room temperature. Surface roughness of the obtained result, the average surface roughness is $0.08{\mu}m$ difference. The reason seems to the influence of the $Na^+$.
하철수(Ha Chul-Soo),윤주식(Yoon Ju-Sik),김정주(Kim Jung-Ju) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.4
Here are the results of the comparative biomechanical analysis of the Taekwondo in Dollyochagi motion during the Badachagi. 1. There were significant differences between the elite and non-elite group at the event 1 and 2 for the hip angle of the Taekwondo in Dollyochagi motion during the Badachagi. 2. There were no significant differences between the elite and non-elite group at all the events for the knee angle of the Taekwondo in Dollyochagi motion during the Badachagi. 3. There were no significant differences between the elite and non-elite group at all the events for the ankle angle of the Taekwondo in Dollyochagi motion during the Badachagi. 4. There were significant differences between the elite and non-elite group at the event 3 for the trunk flexion/extension angle of the Taekwondo in Dollyochagi motion during the Badachagi. 5. There were significant differences between the elite and non-elite group for the maximum vertical ground force reaction of the right foot for the Taekwondo in Dollyochagi motion during the Badachagi. 6. There were no significant differences between the elite and non-elite group for the maximum vertical ground force reaction of the left foot for the Taekwondo in Dollyochagi motion during the Badachagi. In conclusion to the results above for an effective motion of a Taekwondo Taekwondo in Dollyochagi motion during the Badachagi from the event 1 to 2 the hip angle the extension is very important, for the knee angle of the kicking leg after the internal rotation of 90, then it needs to be extended from a position of flexion of 170 at the impact. As for the ankle angle from event 1 to 4 it has to be in maximum plantar flexion, and at the impact it needs to be internally rotated 140, while for the stability of trunk extension angle at event 3 the erector spinae muscles must be strengthened through training and the kicking foot must be able to create a high vertical ground reaction force.
배황(Hwang Bae),윤주식(Ju Sig Yoon),박기철(Ki Cheol Park),장근식(Keun-Shik Chang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Three dimensional turbulent flow in the scroll volute of centrifugal compressor has been numerically investigated in this paper by solving the Navier-Stokes equations and k -ε equation model. The computational grid for the flow field of the scroll volute has been constructed based on the multi-block grid, which is good to avoid the central grid singularity as well as to make grid stretching toward the volute wall. Numerical result has been obtained for the three-dimensional flow of scroll volute. The straight conical volute flow is also solved and compared with the scroll volute data. This comparison contributed to comprehend the effect of scroll in the three-dimensional volute flow of a centrifugal compressor.