골프 스윙 시 경사면에 따른 지면 반력 분석에 관한 연구

문곤성,최희석,황선홍,김영호,Moon, G.S.,Choi, H.S.,Hwang, S.H.,Kim, Y.H. 대한의용생체공학회 2007 의공학회지 Vol.28 No.2

The purpose of this study is to determine the characteristics of ground reaction force(GRF) in golf swing for various slopes of flat lie and uphill lies of 5 and 10 degrees. Five right-handed professional golfers were selected for the experiment and the 7 iron club was used. We used four forceplates to measure GRF and synchronized with the three-dimensional motion analysis system. Results showed that slope did not affect the total time for golf swing, but the time until the impact had a tendency to slightly increase for the uphill lie(p<0.05). The medial-lateral GRF of the right foot increased toward the medial direction during back swing, but less increases were found with the angle of uphill lie(p<0.05). The GRF of the left foot increased rapidly toward the medial direction at the uncocking and the impact during down swing, but decreased with the increase in the angle of uphill lie(p<0.05). The anterior-posterior GRF of both feet showed almost the same for different slopes. With the slopes, the vertical GRF of the right foot increased, but the vertical GRF of left foot decreased(p<0.05). Uphill lies would have negative effect to provide the angular momentum during back swing, restricting pelvic and trunk rotations, and to provide the precise timing and strong power during down swing, limiting movements of body's center of mass. The present study could provide valuable information to quantitatively analyze the dynamics of golf swing. Further study would be required to understand detailed mechanism in golf swing under different conditions.

The Study for the Characteristics on the Various Service Movements and Postures of the Flight Attendants

문곤성 한국융합과학회 2019 한국융합과학회지 Vol.8 No.3

Purpse : The purpose of this study lies on building the base data of presenting the possibility of musculoskeletal disorders by understanding the characteristics of the movements and postures of the flight attendants through the scientific studies of various and repetitive service movements, related to work-related muscular skeletal disorder, WRMSD. Method : Twelve female flight attendants working for the A airline in Korea(age: 30.26±5.42 years, height: 168.24±3.17 cm, weight: 50.79±2.76 kg, work experience: 7.85±5.57 years) participated in this study. The stoop positions were classified into serving the wine postures and delivering food tray postures which are serving wine or food tray to aisle seat and window seat. Regarding the degree of flexion of the knee joint, the squat positions were classified to customer reception posture (CRP), putting food tray into the bottom of cart (PFTBC), putting food tray into the middle of cart (PFTMC). Result : The stoop position of serving wine and delivering food tray was showed to bend the waist about 30 to 60 degree and make upper body as straight as possible by making the flexion of hip joint rather than lowering the upper body part, making typical posture of bending the waist. The postures including squat position such as were showed to lead the flexion of knee joint to 160 degree which increases pressure of patellofemoral joint. Conclusion : The study found out that the stoop position including serving wine and delivering food tray of flight attendants increases the possibility to cause back pain more in lumbar spine. Also, the squat position including CRP, PFTBC, PFTMC postures were caused to increase muscle fatigue by occurring the much muscle moment for the related joints such as the hip and knee flexions and ankle dorsiflexion movement. It could be possible to cause the patellofemoral pain syndrome (PFPS), chondromalacia patella, degenerative arthritis because of increasing the patellofemoral compressing force (PCF) of knee joint. Conclusionally, flight attendants should be recommended to perform the service movements and postures naturally and strengthen muscle usually not to get pain, injuries and disorders.

힘-시간 곡선의 중요시점에 따른 수직 점프 동작의 분석

문곤성,박종률 연세대학교 체육연구소 2002 체육연구논문집 Vol.9 No.1

본 연구는 지면 반력기의 운동역학적 변인과 영상분석의 운동학적 변인의 분석을 통하여 효율적인 수직펌프 동작을 분석하고자 하였다. 실험에 사용된 영상자료는 실내에서 조명을 통해 디지탈 6mm 비디오 카메라(GR-DVL9500, JVC, JAPAN)를 사용하여 수집하였다. 지면반력기는 Bertec사의 모델#B30201 type 4060A이었으며, data 수집은 600Hz로 하였다. 분석과정에서의 해부학적 경계점의 2차원 공간좌표를 계산하기 위해 좌표 측정대(reference frame)를 동작 수행지역에 2.00m×1.00m의 직사면체가 되도록 설치하여 촬영한 후 제거하였다. 카메라 촬영속도는 60 frames/sec로 하고 노출시간은 1/500sec로 설정하였다. 도약 국면(take off phase)에서 두 대상자의 지면 반력 곡선의 유형은 약간 다른 차이를 보였으며, 특히 하강 부하시의 시간요인은 많은 차이를 나타내었으나, landing point는 0.02s 정도의 차이로 거의 유사하였다. 이는 동작구간에 따른 시간적 변인의 차이가 존재하여도 체공시간에는 별 차이가 없었음을 보여주는 것이다. 하지 분절의 각도와 각속도는 도약 국면의 각 동작 시점에서 차이를 보였으며, 각 시점의 최대힘에 영향을 미치는 것으로 보이고 있으나, 이것이 최대 점프 높이나 체공시간에는 별다른 영향을 끼치지 못한 것으로 나타났다. The purpose of this study was analyze the vertical jump with the kinetic variable of force platform and the kinematic variable of cinematography. It's used the digital 6mm video camera(GR-DVL9500, JVC, JAPAN) for the cinematographical data and the force platform of Bertec company(B30201 type 4060A). Collecting data was 600Hz from force platform and 60 frame/sec from video camera and shutter speed was 1/500 sec. The pattern of the ground reaction force curve was a little different between two subjects. Specially, it showed significant difference on the factor of time. But, the landing point was similar between each other (0.02sec difference). So, even though there is a difference of time factor in movement phase, no difference in the flight time. The angle and angular velocity showed the difference on the movement time point of take-off phase that it seemed giving a effect on the max force, but it didn't give a effect on the max jump height and flight time.

아이스 하키 슬랩 샷(slap shot)의 운동학적 분석

문곤성,박종률 한국운동역학회 2003 한국운동역학회지 Vol.13 No.2

Moon, G-S and Park, C-R. Kinematic analysis of Ice hockey slap shot. Korean Journal of Sport Biomechanics, Vol. 13, No. 2, pp. 13-28. The purpose of this study was to analyze the kinematic characteristics of ice hockey slap shot. The subjects of this study were four professional ice hockey players. The reflective markers were attached on the anatomical boundary line of body and the subjects were asked to perform the shot. Ariel Performance Analysis System was used to capture and digitize the shooting image, the date were analyzed by LabView 6i. The results were as follows. 1. The period of the back swing phase was 0.542±0.062sec, the down swing phase was 0.28±0.056sec and the total swing time was 0.825±0.017sec. 2The maximum linear velocity of the stick blade for x direction was shown after 7% of impact, for y, z direction were shown before 2%, 8% of impact. 3. The maximum velocity of each segment for the left arm was 2.35±0.05m/s in the upper arm, 3.56±0.34m/s in the forearm, 4.75±0.67m/s in the hand. 4. The maximum velocity of each segment for the right arm was 4.67±0.43m/s in the upper arm, 7.22±0.69m/s in the forearm, 9.42±0.89m/s in the hand. 5. The angle of left elbow was generally flexed from the ready stance to the impact and was 82.26±3.45° on the moment of impact. 6. The angle of the left shoulder was increased in the down swing phase and was 78.74±4.78° on the moment of impact. 7. The angel of the right shoulder was decreased in the down swing phase and increased before the impact. and the angle was 51.28±3.54° on the moment of impact.

보행 속도 변화에 따른 발목 관절의 운동학적 분석과 하퇴 근육의 근전도 분석

문곤성 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1

G. S. MOON, The kinematic analysis of the ankle joint and EMG analysis of the lower limbs muscle for the different walking speed. Korean Journal of Sport Biomechanics, Vol. 15, No. 1, pp. 177-195, 2005. The purpose of this study was to analyze the kinematic variables of ankle joints and EMG signal of the lower limbs muscle activity for the different walking speed. The subjects were 6 males of twenties. It was classified into three different walking speed-0.75m/s, 1.25m/s, 1.75m/s. The walking performances were filmed by high speed video camera and EMG signal was gained by ME3000P8 Measurement Unit. Tibialis anterior(TA), Gastrocnemius medial head(GM), Gastrocnemius lateral head(GL), Ssoleus(SO) were selected for the dorsiflexion and plantarflexion of the ankle joint. The result of this study were as follows: 1. In the gait cycle, The time parameters for the phases were showed significant difference without the terminal stance phase and terminal swing phase for the different walking speed. 2. The angle of ankle joint was no significant difference for each time point and MDF, MPF but increasing walking speed the angle had the increasing pattern slightly. 3. The angular velocity of ankle joint was showed the significant difference for LHC, RTO, RKC, LHU, MPF and MDF point along the walking speed. 4. TA was showed about 2-3 times muscle activity at the 1.75m/s than 1.25m/s in some phases. And it was showed the similar muscle activity between the 0.75m/s and 1.25m/s but, showed a little much muscle activity in the 0.75m/s. GM was showed about 2-3 times muscle activity in the 1.75m/s than 1.25m/s, and even much muscle activity at the 0.75m/s than 1.25m/s in some phases. GL was showed increasing pattern of muscle activity specially in the initial swing phase as the walking speed increased. SO was showed about 3 times muscle activity in the 1.75m/s than 1.25m/s during the plantarflexion of ankle joint. It was showed the similar muscle activity between the 0.75m/s and 1.25m/s but, showed a little much muscle activity in the 1.25m/s.

국제학술대회 & 아시아운동역학회 창립총회 논문집 : 평지와 내리막 달리기 시 하지 근육의 근 활성도 변화에 관한 연구

문곤성,최지영 한국운동역학회 2006 한국운동역학회 춘계학술발표논문집 Vol.2006 No.-

경사면 골프 스윙의 운동학적 분석

문곤성(Gon Sung Moon),최지영(Ji Young Choi) 한국사회체육학회 2009 한국사회체육학회지 Vol.0 No.37

The purpose of this study is to determine the characteristics of the kinematics in golf swing for the flat and uphill sidehill lie of 10 degrees. Ten right-handed professional golfers were selected for the experiment and the 7 iron club was used. We used the three-dimensional motion analysis system(VICON). The maximum club head velocity was showed 36.42±2.71m/s on the FL, 35.70±1.88m/s on the USL. The slopes didn`t have much effect on the coiling of lower limbs during back swing, the blocking of the lower limbs to minimize the dispersion of the weight and the release of the lower limbs after the impact during down swing. But, to swing with the good balance on the USL, the ankle joint needed to be more dorsiflexion than on the FL.

높은 굽 신발 보행 시 전면 접촉인솔이 보행 변수에 미치는 영향

문곤성(Gon-sung Moon),김택훈(Tack-hoon Kim) 한국전문물리치료학회 2011 한국전문물리치료학회지 Vol.18 No.2

The purpose of this study was to investigate the effect of high heeled shoes with the total contact insert (TCI) on the frontal plane of the joints for the lower extremity during the gait. Ten healthy females voluntarily participated in this study and the height of the high heeled shoes was 7 ㎝. A three-dimensional motion analysis system (VICON) and force plates were used to analyze the movements of the joints for the lower extremities. The results were as follows: There were no significant differences for the angle value on the event of the gait cycle in the maximum eversion and inversion of the ankle joint, the varus and valgus of the knee joint, and the adduction and abduction of the hip joint (p>.05). But, there was a significant difference or the range of motion in the ankle joint (p<.05). The value of ankle and knee moment with a TCI was less than the value for no TCI. And there were significant differences for the moment value of the maximum inversion and eversion on the ankle joint and for the maximum varus and valgus on the knee joint (p<.05). Therefore, a TCI would be effective in stabilizing the joints of the lower extremities and increasing the balance of a body to reduce the injure from a fall during the gait.

스마트 폰 사용 자세에 따른 잠재적 척추 상해에 관한 연구

문곤성(Moon, Gon-Sung) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4

The purpose of the present study was to give the basic data for the potential injury of spinal column on using the smart phone with the postures. A three-dimensional motion analysis system(VICON) was used to analyze the movements of spinal column. Additionally, the emitted markers were attached on the spinal column of back. Four postures were verified by the anatomical position(AP), using smart phone in standing position(USSP_1), using smart phone in sitting position(USSP_2), using smart phone in sitting position leaning back: USSPL) The results were as follows: USSP_1 showed the possibility to make worse on the fore head posture or turtle neck syndrome by bending the cervical vertebral using the smart phone. USSP_2 and USSPL showed the possibility to make negative effect on the lumbar vertebral than the other part of vertebral column by making worse on the kyphotic degree the using smart phone. Specially, USSPL showed the prediction that making negative effect on the lumbar vertebral through pressing the intervertebral disc between the vertebral bones.

노인여성의 계단 내려오기 시 무릎 관절 테이핑이 슬개대퇴 압박력에 미치는 영향에 관한 연구

문곤성(Gon sung Moon),김택훈(Tack hoon Kim) 한국전문물리치료학회 2015 한국전문물리치료학회지 Vol.22 No.3

The purpose of this study was to investigate the effect of taping on knee joint for patellofemoral compressive force (PCF) during stair descent for elderly women. Ten healthy elderly women voluntarily participated in this study. A three-dimensional motion analysis system and force plates were used to analyze the movements of the joints for the lower extremities. The results were as follows: There were no significant differences for the maximum PCF, maximum quadriceps contraction force and maximum knee extension moment (p>.05) but, there was a pattern decreasing all values with the taping during stair descent. There were significant differences for the knee and ankle angle on the event of maximum PCF (p<.05) and there was a pattern decreasing all values with the taping during stair descent. Therefore, taping on the knee would be effective to relieve the pain like patellofemoral pain syndrome in the knee joint.