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( Sukhoon Yoon ),( Jin-hae Kim ),( Jae-hyeon Park ),( Jiseon Ryu ),( Sang-kyoon Park ),( Joo-nyeon Kim ) 한국운동역학회 2017 한국운동역학회지 Vol.27 No.2
Objective: To investigate rotation movement of segment for performing each position and its effect on knee/hip angulation, COM inclination, and edging angle changes. Method: Twelve Alpine skiers (age: 25.8±4.8 years, height: 173.8±5.9 cm, weight: 71.4±7.4 kg, length of career: 9.9±4.6 years) participated in this study. Each skier was asked to perform counter-rotation, neutral, and rotation positions. Results: Shank and thigh were less rotated in the counter-rotation position than in other positions, whereas the trunk and pelvis were more counter-rotated (p<.05). Hip angulation, COM inclination, and edging angle were significantly greater in the counter-rotation position than in other positions (p<.05). Conclusion: Our finding proved that the counter-rotation position increases hip angulation, COM inclination, and edging angle. Consequently, we suggest that skiers should perform counter-rotation of the trunk and pelvis relative to the ski direction in the vertical axis for the counter-rotation position. Further analysis will continue to investigate the effects of the counter-rotation position in real ski slope with kinetic analysis.
Yoon, Sukhoon,Kim, Jin-Hae,Park, Jae-Hyeon,Ryu, Jiseon,Park, Sang-Kyoon,Kim, Joo-Nyeon Korean Society of Sport Biomechanics 2017 한국운동역학회지 Vol.27 No.2
Objective: To investigate rotation movement of segment for performing each position and its effect on knee/hip angulation, COM inclination, and edging angle changes. Method: Twelve Alpine skiers (age: $25.8{\pm}4.8years$, height: $173.8{\pm}5.9cm$, weight: $71.4{\pm}7.4kg$, length of career: $9.9{\pm}4.6years$) participated in this study. Each skier was asked to perform counter-rotation, neutral, and rotation positions. Results: Shank and thigh were less rotated in the counter-rotation position than in other positions, whereas the trunk and pelvis were more counter-rotated (p<.05). Hip angulation, COM inclination, and edging angle were significantly greater in the counter-rotation position than in other positions (p<.05). Conclusion: Our finding proved that the counter-rotation position increases hip angulation, COM inclination, and edging angle. Consequently, we suggest that skiers should perform counter-rotation of the trunk and pelvis relative to the ski direction in the vertical axis for the counter-rotation position. Further analysis will continue to investigate the effects of the counter-rotation position in real ski slope with kinetic analysis.
기계체조 도마 동작의 도움닫기 구간이 경기력에 미치는 영향
윤창선 ( Yoon Changsun ),양태영 ( Yang Tae-young ),박상헌 ( Park Sangheon ),윤석훈 ( Yoon Sukhoon ) 한국체육대학교 체육과학연구소 2018 스포츠사이언스 Vol.36 No.1
The purpose of this study was to determine the effects approaching phase on vaulting in gymnastic performance. Ten gymnasts, divided into skilled group(age: 22.4±1.5 years, height: 165.2±2.9 cm, weight: 61.2±4.1 kg, career: 12.0±2.5 years) who performs vaulting skill level over than 5.2 points and less-skilled group(age: 21.6±0.5 years, height: 162.8±3.6 cm, weight: 57.4±3.2 kg, career: 10.0±2.1 years) who performs vaulting skill level less than 4.8 points, were participated in this study. Then, subjects were asked to perform the Lou Yun movement five times. The board contact, horse contact time, velocity and momentum of approaching phase were measured. In result, the board contact time in skilled group was significantly shorter than less-skilled group(p<.05). Moreover, the velocity and momentum of approaching phase in skilled group were greater than less-skilled group(p<.05). It indicates that skilled group performs more powerful contact than less-skilled group on the board. In addition, skilled group has a big potential for performing high level movements on vaulting with greater velocity and momentum compared with less-skilled group. Therefore, the training for running, approaching which could be step matching, and board contact are very important in order to enhance vaulting performance in gymnastics.
스포츠 마사지 견갑부 전문기법 적용이 Push up 시 근전도에 미치는 영향
윤우람 ( Yoon Wooram ),윤석훈 ( Yoon Sukhoon ) 한국체육대학교 체육과학연구소 2018 스포츠사이언스 Vol.35 No.2
The purpose of this study is the effects of the sports massage before having exercise, by analyzing how the professional sports massage shoulder technique influences on Agonist and Synergist during push-ups. It has studied 15 office workers using computer for a long time in a ”S” company, located in Songpagu, Seoul. The participants were composed of 10 men and 5 women (Age: 27.26+-2.12years, Height: 172.35+-8.91cm, Weight: 67.72+-13.23kg); they have had no experience on the injured shoulder and elbow joint recently and were able to exercise push-ups. The participants were informed beforehand how to exercise push-ups consistently. The activities were measured three times for 5 seconds in flexion and extension period excluding the start and end points of a second in isometric position and the results were averaged. The measure of the muscle activity had been repeated and compared with the value after 10 minutes professional sports massage shoulder technique and 5 minutes rest. The result of this study is that there is statistically a significant difference in muscle agonist activity of the pectoralis major at the bend section after sport massage, and also in the ratio of pectoralis major and upper and lower trapezius. therefore, the professional sports massage shoulder technique applied to reduce the tension of the upper trapezius, and the muscle activity of the pectoralis major, which is the agonist for push-ups, was increased by unstable shoulder movement mitigation.
평창동계올림픽 알파인 스키 회전ㆍ대회전 코스의 지형 특성 및 경기력 요인에 미치는 영향
윤석훈 ( Yoon Sukhoon ),김진해 ( Jin-hae Kim ),박재현 ( Jae-hyeon Park ),류지선 ( Jiseon Ryu ),박상균 ( Sang-kyoon Park ),김주년 ( Kim Joo Nyeon ) 한국체육대학교 체육과학연구소 2019 스포츠사이언스 Vol.36 No.2
The aim of this study is to quantify the characteristics of Rainbow course of Yongpyong resort where the giant slalom (GS) and slalom (SL) of the PyeongChang Winter Olympic Games are held, and to investigate the correlation between the characteristics and the skier’s speed. A candidate for the national alpine ski team who are continuously training the giant slalom and slalom at rainbow course of the Yongpyong resort participated in the study. The Global Positioning System (GPS) was used to measure the position of the gates of GS and SL, and to collect the skier’s trajectory when skier was running. The collected latitude, longitude, and altitude data were chaged into meter units, and the gate distance, gate shift angle, and gradient were calculated and the correlation between the skier’s speed and course characteristic parameters was analysed. The gate distance was 28.60±5.26 m in GS and 12.79±2.53 m in SL. The gate shift angle was 139.68±13.42° in GS and 162.94±9.77°, in SL. The gradient was -28.54±13.65° in GS and -33.66±8.57° in SL. In addition, in the giant slalom and slalom, there was a significant correlation between gate distance and skier’s speed and between gradient and skier’s speed.
Sukhoon Park,Namjung Kim,Hyunjoon Shin,Kyeongbin Lim,Yong-San Yoon 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.3
Total Hip Arthroplasty is a surgical process that replaces a damaged or fractured hip joint with an artificial femoral stem and acetabular cup. It is one of the most successful operations in orthopedic surgery. However, postsurgical results depend largely on the surgeon’s skill. For a more accurate shaping of the femur as well as alignment of the inserted stem, many surgical robots for THA have been developed and commercialized. The most popular robot system for THA is ROBODOC. An earlier surgery robot showed improved results in terms of the error in the angle and in the fit of implant. However, additional surgical procedures are still required with these systems, as it uses a CT image for registration to obtain the transform between the bone coordinate and the robot coordinates. In the HWRS research group, a compact robot system known as ARTHROBOT was designed. It does not use a CT image for registration. This system uses a block-gagebased <BR>registration; therefore, CT or additional procedures are not needed. This robot is fixed to the femur with bone clamp, and the incision larger than in manual surgery. To reduce the incision size, a robot system that is fixed into the femoral cavity was designed. The performance was acceptable; however, the time required for surgery with this system is exceedingly long. In this study, a control method is suggested to reduce the time that is needed for shaping the femur. Following this, the proposed method is verified with plastic bones and bovine bones.
Design of Master Console Robot for Natural Orifice Transluminal Endoscopic Surgery
Park Sukhoon,Lim Kyeong Bin,Jeong Jae Muk,Yoon Yong-San 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
NOTES is new concept of surgery which can get similar result without incise patient’"s skin. But, it is difficult to operate with existing surgery instruments which have flexible joint and low degree of freedom. These can be overcome with a surgical robot. In this research, robot controller which can control robot arm instinctively is developed. The structure of the robot controller is similar to the robot arm so that robot arm can move similar movement of robot controller. In this paper, two methods for controlling robot arm are proposed and the feasibility of application of these methods is simulated.
로봇을 이용한 대퇴 골두의 가공 : 인공 고관절 표면 치환술
박석훈(Sukhoon Park),고병훈(Byung-Hoon Ko),박영배(Youngbae Park),신현준(Hyunjoon Shin),윤용산(Yong-San Yoon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The robot aided surgery for the hip resurfacing arthroplasty with minimal invasiveness is challenging as the registration of the bone as well as the replacement should be performed in a small opening. In this paper, a simple method of registration and carving the femoral head for the hip resurfacing surgery was presented. The surgical robot was tried to cut the plastic model bone with successful results.
The Effect of Types of Initial Drive-in Steps on Technical Factors in Basketball
Park, Sangheon,Yoon, Sukhoon Korean Society of Sport Biomechanics 2018 한국운동역학회지 Vol.28 No.3
Objective: The purpose of this study was to investigate the effect of types of drive-in initial steps in basketball on technical factors, to provide basic information for the enhancement of basketball skill. Method: Ten men (age: $24.70{\pm}2.26years$; height: $181.00{\pm}5.72cm$; weight: $75.70{\pm}8.23kg$; career length: $10.00{\pm}3.59years$), each with a career length of over five years and no history of injury to the lower extremities within the prior six months, participated in this study. They were asked to perform four types of drive-in movements at $35{\sim}60^{\circ}$, wearing their own shoes, after running from a start line 5 m away and catching a basketball passed by an expert passer. The drive-in movements were measured by eight infrared cameras (Oqus 300, Qualisys, Sweden). Collected raw data were used to calculate total initial step time, displacement, velocity, center of mass (COM) height, and COM velocity. Results: Total initial step displacement and velocity of cross drive-ins (JC, SC) were greater than that of direct drive-ins (JD, SD; p < .05). COM velocity of cross drive-ins (JC, SC) was also greater than that of direct drive-ins (JD, SD; p < .05). Conclusion: Our results indicated that cross drive-ins, regardless of stop step type, are more effective than direct drive-ins. This is because cross drive-ins are technically bold due to less influence from walking violations and double dribble rules in basketball. However, using one-sided movement is too difficult to play in competitive game; therefore, basketball players should develop the ability to choose appropriate movement frequency.