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소하주,유미,곽기영,김성현,김남균,김동욱,So, H.J.,Yu, M.,Kwak, K.Y.,Kim, S.H.,Kim, N.G.,Kim, D.W. 대한의용생체공학회 2010 의공학회지 Vol.31 No.2
Soft Golf is a newly developed recreational sport in our research team aimed to become a safe and easy-to-learn sport for all ages. The advantage of Soft Golf stems from lighter weight of the club and much larger area of the sweet spot. The purpose of this study is to analyze ground reaction force(GRF) and joint angle during soft Golf club and regular golf club swing. The GRF of golf swing was recorded by 3-D motion analysis system and forceplate. The joint angle of golf swing was obtained from computer simulation model. The GRF and joint angle of golf swing are used to analysis of golf swing pattern. The pattern of GRF and joint angle during soft golf club swing was similar to that during regular golf club swing. This result means that soft golf club reduces the risk of injury and has an effect on similar entertainment of regular golf.
소하주,김동욱,김성현 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The present study was conducted to observe human physiological response through EEG to intensity of somatosensory stimulation applied on the tibialis anterior and Achilles tendons. In order to investigate the relation between physiological response and somatosensory stimulation, two hypotheses were established. First, different human body reactions may be induced depending on the location of the incoming somatosensory stimulation; second, somatosensory stimulation even at sub-threshold levels could significantly affect the human body. The experiment was conducted with the somatosensory stimulation system and EEG system, seven male adults were involved. The three kinds of somatosensory stimulation (sub-threshold, threshold, supra-threshold) was uesd, these stimulation was applied to the Achilles tendon and the tibialis anterior tendon of the subjects, and their brain waves were measured. According to the results of experiments, the brain response to somatosensory stimulation to the ankle tendons and the structures that play an important role in walking were shown to be different according to the inflow location of the somatosensory stimulation. And the brain response to somatosensory stimulation to the tibialis anterior tendon and Achilles tendon appeared similar regardless of the stimulation intensity.
족관절에 인가한 진동자극이 계단 하강 동작에서 청년과 노인의 관절각도와 지면반발력에 미치는 영향
소하주,곽기영,김성현,양윤석,김남균,김동욱,So, H.J.,Kwak, K.Y.,Kim, S.H.,Yang, Y.S.,Kim, N.G.,Kim, D.W. 대한의용생체공학회 2011 의공학회지 Vol.32 No.1
The purpose of this study was to investigate changes in the center of pressure (COP), ground reaction force (GRF) and joint angles of elderly people and young people while stair-descent. The participants in this experiment were 5 elderly people and 5 young people, each of which was asked to descend stairs of three different heights (8 cm, 16 cm, and 32 cm). As they climbed down the stairs, they received vibration stimulation on the lower limb. The change of COP, GRF and joint angles were analyzed during the standing phase. COP decreased as the Achilles tendon and tibialis anterior tendon were vibrated. Vertical GRF increased as the Achilles tendon was vibrated, and the joint angle differed according to vibration stimulation conditions. These results mean that ankle joint, knee joint and hip joint were influenced by the vibrations on the lower limb as the participants descended the stairs. It was concluded that the vibration stimulation on the lower limb allowed the participants to efficiently climb down the stairs.
계단 하강 보행 동안 체성감각 자극이 노인의 하지 관절 역학에 미치는 영향
곽기영,소하주,김성현,양윤석,김남균,김동욱,Kwak, K.Y.,So, H.J.,Kim, S.H.,Yang, Y.S.,Kim, N.G.,Kim, D.W. 대한의용생체공학회 2011 의공학회지 Vol.32 No.2
The purpose of this study was to investigate lower-limb joint torque of the two groups as it changed by somatosensory stimulation during the descent down three stairs of different heights and to describe the difference between the two groups, which are young people group and elderly people group. Subjects of each groups climbed down a stair at four stimulation conditions, which are non-stimulation, tibialis anterior tendon stimulation, achilles tendon stimulation, tibialis anterior - achilles tendon stimulation. Motion capture data were collected using 3D optoelectric motion tracking system that utilizes active infrared LEDs, near infrared sensor and force plate. The obtained motion capture data was used to build 3D computer simulation model. The results show that lower-limb joint torque of the two groups changed with somatosensory stimulation as they descended the stairs and the joint torque of the two groups differed from each other.
소프트 골프 스윙 동작을 위한 인체 시뮬레이션의 운동역학 분석
곽기영,유미,소하주,김성현,김남균,김동욱,Kwak, K.Y.,Yu, M.,So, H.J.,Kim, S.H.,Kim, N.G.,Kim, D.W. 대한의용생체공학회 2010 의공학회지 Vol.31 No.2
The purpose of this study was to analyze the golf swing motion for a soft golf clubs and regular golf club. Soft golf is a newly developed recreational sports for all ages, including the elderly and the beginners of golf. To quantify the effect of using soft golf club, which much lighter club than regular clubs, a motion analysis has been performed using a 3D optoelectric motion tracking system that utilizes active infrared LEDs and near-infrared sensors. The subject performed swing motion using a regular golf club and a soft golf club in turn. The obtained motion capture data was used to build a 3D computer simulation model to obtain left wrist, elbow shoulder and lumbar joint force and torque using inverse and forward dynamics calculations. The joint force and torque during soft golf swing were lower than regular golf swing. The analysis gave better understanding of the effectiveness of the soft golf club.