스포츠인체모델 개발을 위한 기반기술 개발

김사엽(Sa Yup Kim),정경렬(Kyung Ryul Chung),박성빈(Seong Bin Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

본 연구는 한국인 스포츠 인체모델을 개발하기 위한 기반기술에 대한 연구로서, 이는 해부학적, 역학적, 생리학적 파트로 구성하였다. 해부학적 파트는 한국인의 체형을 모델링하기 위하여 성별, 연령별 기준에 따른 신체조성 DB와 인체분절계수에 대한 예측모델발로 구성하였다. 역학적 모델 파트는 운동 동작에서 나타나는 생체역학적 측정요소에 대한 데이터베이스와 운동기구 사용 시 인체의 반응을 예측할 수 있는 예측모델로 구성하였다. 생리학적 모델 파트는 한국인 체력요인 데이터베이스 구축과 운동기구 사용 시 신체의 변화를 나타내는 예측모델 개발로 구성하였다. 또한 운동기구 사용에 따른 인체영향 평가를 위해 올바른 데이터 수집과 측정, 평가를 위한 평가 표준지침을 개발하고, 이를 통해 제품 및 프로그램의 효과를 평가할 수 있는 기반을 마련하였다. 스포츠 인체모델은 운동 기구 및 프로그램의 개발 및 운동효과를 예측하기 위한 핵심기술로 활용될 수 있을 것이다. The purpose of this study is the technology for development of sports human model of Korean people. Sports human models consists of anatomical, biomechanical and physiological parts. Anatomical parts are database of body composition and prediction models. The database was developed body segment parameter for kinematical modeling in Korean. Prediction models are the algorithms for kinematical characteristics. Biomechanical parts means database of biomechanical measure data during sports activities. And they are also prediction model for estimate of biomechanical responses using sports equipment. Physiological parts are database for Korean people's physical fitness and algorithm for predict of human-body effects during training. Furthermore, we developed a guideline on measure and evaluation standards of physical fitness factor, so could be evaluate the performance and quality of sports equipment using guideline.

고령자 ADL 개선을 위한 기능적 운동 분석 및 선정

김사엽(Sa Yup Kim),박성빈(Seong Bin Park),형준호(Joon Ho Hyeong),정경렬(Kyung Ryul Chung) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.6

Muscular strength in the elderly is important factors deciding on functional state in daily lives, and functional state shows a health condition. Resistance training to prevent loss of muscle mass and muscle fiber atrophy due to aging can increase muscle mass and strength. Recently, resistance training to improve muscular strength and endurance has been actively researched. Resistance training increases activities of daily living and ability of the elderly, which makes healthy senescent. ADL/IADL is suitable for measuring health condition of the elderly. In this study, target muscles of resistance training were chosen through a correlation analysis between ADLs and elementary motion, and we presented a procedure to select target muscles and exercise equipments. This procedure consist of a survey method that were described detailed motion of ADL/IADL. So we should be to extract resistance training machine to improve functions of regarding fundamental motion. Result of study may improve daily life activities of the elderly through objectives and scientific approaches. Furthermore, it will be helpful to studies about various fields of the elderly.

고령여성의 근저항성트레이닝 후 트레이닝 중지가 신체조성과 Senior Fitness Test에 미치는 영향

김사엽(Sa Yup Kim),정경렬(Kyung Ryul Chung),주성범(Sung Bum Ju),윤성덕(Seong Deok Yoon),박기덕(Gi Duck Park) 한국발육발달학회 2010 한국발육발달학회지 Vol.18 No.1

The purpose of this study was to evaluate effects of detraining after muscular progressive resistance training on body composition and senior fitness test in the elderly women. Subjects were divided 2 group(20-30%RM low intensity group, 40~50%RM middle intensity group) from 14 elderly women. The subjects performed muscular progressive resistance training for 12 weeks and detraining for 12 weeks effects on body composition (LBM, body fat, %body fat), senior fitness tests(30second chair stand, arm curl, 6-minute walk, chair sit & reach, back stretch, 244 cm up & go, grip strength) have been evaluated. Analysis of the body composition, Both low intensity group and middle intensity group wasn`t significantly difference. Analysis of the senior fitness test, 30second chair stand, arm curl, 6-minute walk, chair sit & reach(right) showed significantly decreased detraining after muscular progressive resistance training in 20~30%RM low intensity group and 30 second chair stand, arm curl showed significantly decreased detraining after muscle resistance training in 40~50%RM middle intensity group. To conclude, detraining for 12 weeks after muscular progressive resistance training in the elderly women had a tendency to decrease of some SFT and intensity of muscular progressive training had influence on the principal factor of decrease of SFT.

곡면형 무동력 트레드밀의 곡률반경에 따른 주행특성 비교

김사엽(Sa-Yup Kim),노종련(Jong-Ryun Roh),형준호(Joon-Ho Hyeong) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

This investigation was undertaken to examine the biomechanical responses during walking and running on a Non-Motorized Curved Treadmill(NMCT). In this study, three different radius of curvature(2500㎜, 3000㎜, 3500㎜) of the NMCT were used to treadmill walking and running according to the three different speeds(70, 110, 170 step/min), and the speeds were controled by cadence. Subjects walked for three minutes with breaks between trials of speed and curvature to prevent fatigue. Twenty-seven retroreflective markers affixed to the full body were used to record three-dimensional kinematics(60Hz, Osprey, Motion Analysis Corp., USA) on the three different curvature of the NMCT with three different speeds. The step length was increased, and initial contact position on the treadmill belt has moved backward at lesser curvature. But the step width and deviation of center of body mass in the Anterior-Posterior direction were increased at the decreased radius of curvature, which mean the stability of walking and running on the NMCT was decreased. Consequently, the curvature needs larger radius to make stable walking and running, on the other hand, it needs lesser radius to walk and run easily on the NMCT.

群環의 非半單純性에 關하여

閔士基,曺秉燁,金仙兒 朝鮮大學校 師範大學 1974 師大論文集 Vol.5 No.-

Let G be a group, R a ring. Define a group ring RG consisting of finite formal sums of the form ∑??αigi (αi∈R, gi∈G). Our aim is to give the following two results with respect to the non-semi-simplicity of RG in the sense that the radical of RG is non trivial: [theorem A]: Let G be a p-group with order Pⁿ and let R be an algebraically closed field whose characteristic p≠0. Then the set B={g-1lg∈G, g≠1} is the R-basis of the radical of RG and the dimension of the radical is Pⁿ-1 [Theorem B] Let G be a group with order Pⁿm, (p, m)=1, H be a normal p-Sylow subgroup and R be an algebraically closed field. Then the radical N(RG) of RG is given by the form ∑??(h-1) RG, 1≠h∈H, and its dimension is m (Pⁿ-1)

틸트 메커니즘 설계를 위한 체계적 접근방법에 관한 연구

정경렬(Kyung-Ryul Chung),김사엽(Sa-Yup Kim),형준호(Joon-Ho Hyeong) 한국디자인학회 2008 한국디자인학회 학술발표대회 논문집 Vol.- No.-

착석자세 모니터링 시스템 개발을 위한 착석자세 추정 연구

형준호(Joon-Ho Hyeong),김사엽(Sa-Yup Kim),노종련(Jong-Ryun Roh) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

Posture correcting system applies to the office chair that monitoring a sitting posture and send feedback to the user at real time basis. In the previous study, pressure sensors has been equipped both on the backrest and the seat pan to estimate sitting posture from five different posture types. In this preliminary study, posture detecting experiment has performed only using seat pressure sensors for reducing product cost. A subject was seated on the seat pressure mat and asked to change posture during measurement of the load at four divided sectors. The result says that the percentage of total force on seat pan compared with body weight (%BW) is a suitable index for assessing whether the users back lean against the backrest or not. Consequently, five different major sitting postures could be detected only using seat pressure sensors. The posture measuring technique is expected to be applied to the posture monitoring chair with resonable price.

ADL Common Element Motion Analysis for Personal Life Log Service

Jong Hyun Kim,Jong Ryun Roh,Sa Yup Kim,Sang Hyoung Lee,Jae Soo Hong,Byeong Hee Won 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.11

사무용 의자의 조인트 구조에 따른 등판 반발력 분석

형준호(Joon Ho Hyeong),김사엽(Sa Yup Kim),노종련(Jong Ryun Roh),박성빈(Seong Bin Park),정경렬(Kyung Ryul Chung) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.6

등판이 기울어지는 사무용 의자에서 등판 회전축 위치를 인체의 엉덩관절에 일치시키면 인체와 등판이 일체화되어 기울어짐으로써 사용성을 향상시킬 수 있다. 그러나 등판 힌지가 외부로 돌출되지 않도록 하기 위해 적용되는 핀인슬롯 조인트에서 기구적인 마찰이 발생해 등을 기울이고 세우는 동안 사용자에 영향을 줄 것으로 예상된다. 본 연구에서는 마찰 정도가 다른 조인트 부품으로서 슬라이더, 롤러 그리고 베어링 세 가지 유형을 적용하고, 등판 기울임 시 대비 복귀 시의 반발력 비율을 측정하였다. 실험 결과 베어링, 롤러, 슬라이더를 적용한 경우 등판 반발력 비율은[±SD]은 각각 59.7[±10.3]%, 47.2[±13.6]%, 30.3[±18.1]%로 나타나 베어링을 적용할 경우 마찰이 가장 작았다. 그러나 각 부품들은 생산단가 측면에서 차이를 보이기 때문에 부품 선정 시 마찰감소 성능뿐만 아니라 사용자의 주관적인 만족도를 함께 고려할 수 있음을 제시하였다. The location of the pivot between the backrest and seat pan of a reclining chair should be identical to the hip joint center to prevent unpleasant user experiences during tilting motion. However, mechanical friction occurs in the pin-in-slot joints that are installed under the seat pan as an alternative to the hinge joint. This reduces the reaction force between the backrest and the occupant"s back when reclining and returning to an upright position, which causes the occupant"s discomfort. In this study, bearings, rollers, and sliders were suggested as alternatives for the pin component, and the percentage of the reaction force on the backrest was measured while reclining the backrest and subsequently returning it to an upright position. The results show when bearings, rollers, and sliders were used for the pin-in-slot joint, the percentages of the reaction force were 59.7 ± 10.3, 47.2 ± 13.6, and 30.3 ± 18.1, respectively, indicating that the friction of the bearing was the lowest among the three pin components. Because the three alternatives have different manufacturing costs, synthetic judgment requires the consideration of not only mechanical friction but also user experience.

무동력 트레드밀, 동력 트레드밀과 지상에서 달리기 운동 시 근 활성도와 근 피로도 비교

장주성(Jang, Ju-Sung),김사엽(Kim, Sa-Yup),형준호(Hyeong, Joon-Ho),노종련(Roh, Jong-Ryun),박기덕(Park, Gi-Duck) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2

The purpose of this study was to measure the muscle activity and muscle fatigue of the trunk and lower extremity muscles during running on the Non-motorized Treadmill, Motorized Treadmill and Overground. In 15 healthy male, we compared muscle activity and muscle fatigue during running exercise with a constant distance from a Non-motorized Treadmill, Motorized Treadmill and Overground with self selected constant velocity. We will identify the characteristics of each exercise condition and use it as the basic data for selecting the most suitable exercise condition for the purpose such as training, conditioning, rehabilitation in the future. This study suggests that the characteristics of each exercise condition are understood by comparing the muscle activity and muscle fatigue during Non-motorized Treadmill, Motorized Treadmill and Overground, In future studies, more data will be collected by using various age groups and various speeds. Based on this, we will be able to present effective exercise. The muscle activity and muscle fatigue of trunk and lower extremity muscles were different in exercise condition and exercise period. However, there was no significant difference in all exercise conditions and exercise periods. This suggests that various variables such as subject, exercise condition, and exercise intensity should be considered as a result of contradiction with previous studies.