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인체 무게 중심 분할에 따른 500m 숏트트랙 스피드 스케이팅 출발 기술 분석
백진호,정남주,한기훈,이용구,윤동섭,이용식,Back, Jin-Ho,Chung, Nam-Ju,Han, Ki-Hoon,Lee, Yong-Goo,Yoon, Dong-Seob,Lee, Yong-Sik 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3
The purpose of this study was to attempt new starting motion and supply present starting motion in the 500M short track speed skating according to the center of gravity position. The center of gravity position ratio was divided starting motion into five(type A : front 80%-back 20%, type B front 70%-back 30%, type C : front 50%-back 50%, type D : front 30%-back 70%, type E : front 20%-back 80%). The three dimension motion analysis with DLT(direct linear transformation) method was executed using two video cameras. The following conclusion was that It was appear that reaction and execution time in starting motion was the most short in type B. It was characteristic that step of skaters was shorten and center of gravity position ratio was not effect to change of the step in each event. It was appear that the displacement of type D and type E were longer than that type A and type B during the starting motion. It was appear that skill types of center of gravity position ratio to the front were lower than that to the back and contract a posture. Observing the above, it was conclusion that skill type B of center of gravity position ratio to the tent was more effect than that to the back. But it is important that these skill type was most used to the competition and estimate the result.
스노보드 지상 자세훈련과 슬로프 상에서의 턴 동작 시 운동학적 비교
백진호(Back, Jin-Ho),이주성(Lee, Ju-Sung),Siddhartha Bikram Panday,이용식(Lee, Yong-Sik),주현식(Chu, Hyun-Sik) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.1
The purpose of the study was to validate the training equipment through the kinematical comparative analysis of snowboard turns on actual slope and on training device. Three dimensional motion analysis was performed on both conditions of which changes in vertical displacement of hip and lower limb joint angles in each events were compared. In the results, the position of hip was obtained higher in training device than on actual slope whereas, during the back turn the maximum inclination of the body was observed much smaller in actual slope which is considered as a result to perform stable turns through reducing the angle. In conclusion, as snowboarding involves dynamic movements, the training device chosen for the study could only mimic some aspects as of the real environment and reflects the technical limitation of the equipment. Hence, need of much more complex training device which could facilitate dynamic movements as of real competitive situation is considered be beneficial not only for skill acquisition but also for training specific muscles required in snowboarding.
백진호(Back, Jin-Ho),허선(Hur, Sun),이용식(Lee, Yong-Sik),이주성(Lee, Ju-Sung),주현식(Chu, Hyun-Sik),시다르타(Siddhartha Bikram Panday) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5
The purpose of this study was to investigate analysis of energy expenditure of ski plate in ski players. Six male alpine ski athletes volunteered to participate in the experiment. The rotating F1 made by F Co. and existing products S1 and S2 plates used in the experiment, and the doble blind test were performed. Subjects installing F1→S1→S2 plates each performed three runs. Energy metabolic variables were obtained from portable wireless gas analyzer and polar at rest, lactate threshold (LT), and maximal oxygen uptake (VO₂max) for determination of heart rate (HR), oxygen uptake (VO₂), metabolic equivalent (MET) and energy consumption (EE). The change in HR, VO₂ and EE were more higher when installing F1 than S2 and S1 plate at the LT point. Oxygen uptake as an indicator which showed the mobilization capacity of lactic acid system during energy metabolism and the depletion of energy sources, the concentrations of fatigue substances in peripheral muscle by exercise also more increased with the increased in speed, when installing F1 plate than S2 and S2 plates.
백진호(Back Jin-Ho),이용식(Lee Yong-Sik),윤창선(Yoon Chang-Sun) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.2
The subject of this study was attempted to kinematical characteristics of the Winkler performance at the horizontal bar in men's apparatus gymnastics. The subjects were only one who can performed Winkler. Then it was analyzed using Kwon3D(Visol Korea) 3.0 program. As a result, the first motion wasn't got unfolded the body. It occured weak point that caught the bar narrowly because air rotation and twist distances was not enough. so caught the bar with lower position than horizontal bar. The second motion, it was central to up and down, the body was got unfolded and trunk rotation and twist was good performed. Downswing phase, center of mass was located high position and nearly horizontal bar. so it could safety re-grape, To have a successful Winkler performance, it must be bigger and faster at downward using the centrifugal force and the rotating must be faster at the highest point of the upward and in the air to catch the bar for prepare for next performance.
백진호(Back Jin-Ho),이용식(Lee Yong-Sik),윤창선(Yoon Chang-Sun) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.3
Recently according to the movement of F.I.G, it is estimated that bonus points for linked techniques will be limited as much as possible so that it would induce development of creativity for high level technique. Therefore, our athletes should be interested in developing high level technique rather than learning skill which can be utilized for bonus points in the future. Currently, various activities are held for technical analysis, but because it requires much effort and time for courses such as camera shooting movements, complex data handling, and etc. in limited conditions, immediate feedback is not actually realized. For such reason, information of excellent athletes in the world cannot be obtained, so it cannot be said that its efficiency reaches a high level. In such aspect, the study intends the followings. First, it intends to develop technical analysis system with multimedia function so that athletes could be provided with feedback quickly during training or competing. Second, it intends to establish a basis for providing efficient feedback to athletes by establishing a database which is actually applied after being modified and supplemented by focusing on previous studies and data. The technical analysis system immediately provides feedback information, minimizing the errors of apparatus gymnastics athletes while learning techniques so that they could easily learn high level techniques. In the future, it requires extension to floor exercise and pommel horse, and continuous security in the system is required. Also, web based operation should be considered so that all gymnastic athletes could use it.
백진호,박종철,윤종완,이용식,박종훈,Back, Jin-Ho,Park, Jong-Chul,Yoon, Jong-Wan,Lee, Yong-Sik,Park, Jong-Hoon 한국운동역학회 2006 한국운동역학회지 Vol.16 No.3
This study was attempted to Kinematical characteristics of the Endo $360^{\circ}$El-grip Swing on the horizontal bar. To do this, we selected and analyzed the performance of two athletes who did Endo $360^{\circ}$El-grip Swing in the horizontal bar competition of male artistic gymnastic in the 22nd Universiad Games 2003 Daegu. We drew the conclusions from the kinematical factors that were came out through analyzing three-dimensional cinematography of the athletes' movements, by using two video cameras. In point of analyzing the actual competition situation, it is expected that gymnastics and coaches have the effective informations, and the following conclusion had resulted. 1. When performing Endo $360^{\circ}$El-Grip, the average for entire required time was $1.93{\pm}0.06sec$. The average for descent phase time was $0.24{\pm}0.02sec$, ascent phase time was 0.22${\pm}0.07sec$, connecting phase time was $0.87{\pm}0.07sec$, and El-Grip phase time was $0.61{\pm}0.02sec$. The descent phase need short period of time but however to have a stable performance, ensuring ascent and connecting phase time are needed. El-Grip phase need short period of time to have a stable re-grasp. 2. To have a convenient preparation for El-Grip in descent and ascent phase, lowering CM, and ease up in sway and plunge from the High Bar would make descent and ascent even more faster and would have increase effect in trunk rotation. 3. In descent and ascent phase, if shoulder angle and arm slope is dwindling then it would effect rotation angle so might risk it from hitting a Bar when putting legs in and out. 4. In connecting phase, it requires some time to show stable performance when El-Grip phase is continued by using hip angle which would make trunk rotation angle bigger and make descent and ascent time slower. 5. In El-Grip phase, when doing motions like hand standing. using hip angle more than maximum would make CM even faster and it is stable position while performing.
백진호(Back, Jin-Ho),이주성(Lee, Ju-Sun),시다르타(Siddhartha Bikram Panday),이용식(Lee, Yong-Sik),윤상문(Yoon, Sang-Moon),수다우엔(Xu Dayuan) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.6
The purpose of the study was to perform gait analysis of three different winter boots (BD, EZ, NS) and provide reference data for designing a multipurpose snowboard boots which can be used during snowboarding as well as for outdoors activities. Four male snowboarders who were from Korea Youth National Team and demonstrator participated in order to achieve the purpose of the study. Six 3D Motion analysis system (Vicon612 Motion Systems. Ltd., UK) and four force plates (AMTI ORG-6) were used to analyze the changes in kinematic and kinetic variables. Angular variables of lower limbs i.e. Peak max & min of knee and hip angles and Ground Reaction force (Fz) were calculated to measure the effect of three different winter boots on gait. The results obtained from the study are as follows: The type of vamp effected the limb moment. Soft boots (EZ) caused more hip adduction of supporting leg than stiff snowboard boots (BD) during one leg support phase and allowed bigger flexion of hip on swing leg. Wearing stiff snowboard boots (BD) caused larger hip’s internal and knee’s internal and external rotation of the supporting leg than normal winter shoes (NS). Boots type also effected the knee’s external rotation and flexion of the swing leg. Furthermore, it is considered that wearing stiff boots limited the ankle ROM due to which significant differences were also observed in knee flexion of the supporting leg.