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축구 사회체육지도자들의 디딤발 거리 변화에 따른 인스텝슈팅 동작의 생체역학적 특성분석
김성섭(Sung Sup Kim),배재열(Jae Yeul Bae),노덕선(Duck Sun Rho),김지태(Ji Tae Kim),김민현(Min Hyun Kim) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.54
The purpose of this study was to analyze the biomechanical variables of in-step shooting motion by supporting foot`s distance in soccer. The subjects who were 4 inst ruct`s in soccer and filmed and measured by using MX13 Camera(250Hz, 7camera) of vicon motion system and force plate analyze(ATMI). In case of distance between supporting foot and ball is 20 cm, the 1 phase was quick shooting given owing to its short performance with 0.11±0.01 sec, while the 2 phase gave more power to ball owing to its longest time of performance with 0.217±0.11 sec. In case of distance between supporting foot and ball is 20 cm, the X axis was minimized the distribution of power by small movement with the 1 phase and 2 phase, while Y axis gave the most movement of COM given with the 1 phase and 2 phase, and Z axis also gave the most movement like Y axis given with the 1 phase and 2 phase. The posture of knee and ankle was in 25 cm from the supporting foot, the range of motion with flection and extension was applied biggest. Next was in 15 cm, while knee angle of ankle in 20 cm on step, the range of motion with flexion and extension was less given. Excluding the impact point in 15 cm, the right knee angular velocity was faster as t he parallel distance between the supporting foot and ball was longer, which become gradually faster from the event 1 and event 2, and drastically reduced in event 3. The maximum value of vertical GRF was appeared after 0 .003 sec in the point of foot on step touch the ground, and the vertical GRF was the highest of the maximum value of vertical GRF and of the impact point in the distance of 25 cm from supporting foot and ball.
태권도 선수와 동호인간의 하지 좌 · 우 대칭운동의 운동학적 비교 분석
김성섭(Sung Sup Kim),백승철(Seong Chul Ba다),김지태(Ji Tae Kim) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.54
The purpose of this study was to examine characteristics in two groups by comparatively analyzing the kinemetical variables of bilateral symmetry on lower extremity according to skill level in Taekwondo. The group with experts was selected 9 exhibition members at Yuniversity with over 7 years of career in Taekwondo. The group with non-experts was selected 9 club members at Yuniversity with under 1 year of career in Taekwondo. The bilateral symmetry on lower extremity was limited to Do lryeochagi out of Balchagi(an act of kicking) in Taekwondo. The statistically significant difference was indicated in all variables except the flexion and extension of hip angle in the lower extremity joint angle. The bilateral symmetr y could be known to be excellent. The group with non-experts showed the bigger difference in lower extremity joint angle than the group with experts, and showed the statistically significant difference in variables of required time and peak tiptoe synthetic rate, thereby having been indicated to be short of the bilateral symmetry.
한국 · 대만 유도국가대표선수들의 한팔 업어치기 동작 시근 활성도 비교 분석
김의환(Eui-Hwan Kim),안병근(Byung-Keun Ahn),김성섭(Sung-Sup Kim),조준명(Joon-Myoung Cho),지준안(Chun-An Chi),진종현(Jong-Hyun Jin),김지태(Ji-Tae Kim) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.2
The purpose of this study was to compare and analyze the electromyograpic activity between Korean and Taiwanese of Ippon-Seoinage (one-armed shoulder throw) as Tokuinage (favorite and major technique) in Judo. The subject (Tori, attacker), who was 4 Korean and Taiwanese representative judoists from 2007 to 2009 years, respectively, Uke (defender) was a Judo-doll made by Kim, Eui-hwan etc. (2007), whole body of judo-doll was fixed, upper body was flexible 35 degree forward and backward, lower was 15 degree, was used to muscles activities measured by surface-electrode & electromyography. Subject performed 5 successful trials respectively, with parter (Uke) was resistance (R-0%) of judo-doll. Muscle activities were obtained from the electromyography analysis. Muscle activities in all phase, Taiwanese were lower than Korean, right Bicep, Trapezius, Tibialis muscles in Kuzushi phase, right Bicep, right Trapezius, left Rectus abdominus in Tsukuri and Kake phase, different between Taiwanese and Korean were signify (p < .5).
샤플리가치를 이용한 수박 브랜드 통합의 경제적 이익 배분 연구
김성섭 ( Seong Sup Kim ),서상택 ( Sang Taek Seo ) 한국농업경제학회 2012 農業經濟硏究 Vol.53 No.2
This study derives a fair allocation of economic margin resulting from brand unification of watermelon originated in Jincheon County in Chungbuk Province. A concept of Shapley value, a part of co-operative game, is used to derive the allocation ratio between two participants(Deoksan and Saenajincheon), where the shapely value is calculated according to the marginal contribution of each brand to the value of unified brand. One hundred thirty three farmers(sixty seven from Deoksan and sixty six from Saengajincheon) were surveyed with the items of farmer`s preference to brand unification, the expected price of watermelon with unified brand, and the need of criterion for the allocation of economic margin resulting from brand unification. Results show that the fair allocation ratio of economic margin are fifty five percent for Deoksan and forty five percent for Saengajincheon. A sensitivity analysis was performed to check the variation of the fair ratio by changing the expected price of watermelon with unified brand. The ratio with fifty five percent for Deoksan and forty five percent for saengajincheon was robust in spite of price change.
김성섭 ( Seong Sup Kim ),서상택 ( Sang Taek Seo ) 한국농업경제학회 2014 農業經濟硏究 Vol.55 No.4
The objective of this study is to evaluate the value of flexibility for cropping system with greenhouse facilities that farmers can take contingent on market condition. A concept of switch option, a kind of Real Options(RO) approach, is adopted to evaluate the option value of flexible cropping system. For the simplicity, region is limited to Chungbuk province and crops for cropping systems are limited to watermelon and melon. Prices of both crops are assumed as stochastic variables and proved to follow mean-reverting process. Results show that farmers choose crops based on relative prices for the first crop. On the other hand, watermelon is hardly chosen for the second crop because the price of watermelon far below than that of melon. The value of flexibility, defined as the difference of the value of flexible cropping system and the value of inflexible cropping system, is 1,583 thousand won during three business years. Sensitivity analysis show that the flexibility value increases with melon production and volatility of melon and decreases with production cost of melon. The results imply that the value of flexibility for cropping system should be reflected in the investment analysis of fruit vegetable farming with greenhouse facilities.