인체역진자모델에 기초한 컬링 속도제어능력이 자세조절 및 접지면의 압력변화에 미치는 연구

유경석(Kyoung Seok Yoo) 한국사회체육학회 2009 한국사회체육학회지 Vol.0 No.36

피겨스케이팅 활주속도가 운동수행기술 발휘에 미치는 영향

유경석 ( Kyoung Seok Yoo ) 한국운동역학회 2007 한국운동역학회지 Vol.17 No.3

Flying Sit Spin과 Flying Camel Spin 시 규정자세에 따른 족저압력패턴의 연구

유경석 ( Kyoung Seok Yoo ) 한국운동역학회 2008 한국운동역학회지 Vol.18 No.1

연령에 따른 근력감소가 악력조절능력에 미치는 영향

유경석(Yoo, Kyoung-Seok) 한국사회체육학회 2023 한국사회체육학회지 Vol.- No.93

Purpose: This study aims to explore the correlation between exercisen tiensity levels and the impact of age-related decline in muscle strength on muscle maintenance ability and muscle memory, both of which play a crucial role in muscle control. Method: The participants in this study were dived into three male age groups: young adults (20s and 30s), middle-aged individuals (40s and 50s), and elderly individuals (70s and 80s). Various measurements were recorded, including BMI index, skeletal muscle mass, bodyf at percentage, and body development score. To assess maximum grip strength, grip strength control baility, grip maintenance ability, and muscle memory ability, various evaluations were conducted, Exercise intensity was categorized into three levels based on 100% maximum voluntary force (MVF). Grip strength wasc ompared between age groups and exercise intensity levels using repeated measures analysis of variance (RM ANOVA), with statistical significance set at p<.05 and p<.01. Results: The study’s findings revealed significant differences in phyiscal characteristics such as skeletal muscle mass, body fat mass, and physical development score across different age groups (p<.01). Statistically significant differences were also observed in exercsie intensity and grip strength control ability between age groups, with significant interaction effects amongt he groups. Furthermore, significant differences were identified in muscle memory ability between age groups when visual information blocking was either present or absent. Conclusion: The study concludes that there is a decline in grip strength g, rip maintenance ability, and muscle memory ability as individuals age, highlighting the importance of maintaining appropriate muscle strength as one progresses through different life stages. Thiss tudy emphasizes the significance of exercise intensity in preserving muscle function and memory, especailly in the context of age-related muscle strength decline.

드롭착지 동작 시 체간모델에 따른 척추분절운동이 자세안정성 해석에 미치는 영향

유경석 ( Kyoung Seok Yoo ) 한국운동역학회 2014 한국운동역학회지 Vol.24 No.4

The purpose of this study was to assess the inter-segmental trunk motion during which multi-segmental movements of the spinal column was designed to interpret the effect of segmentation on the total measured spine motion. Also it analyzed the relative motion at three types of the spine models in drop landing. A secondary goal was to determine the intrinsic algorithmic errors of spine motion and the usefulness of such an approach as a tool to assess spinal motions. College students in the soccer team were selected the ten males with no history of spine symptoms or injuries. Each subject was given a fifteen minute adaptation period of drop landing on the 30cm height box. Inter-segmental spine motion were collected Vicon Motion Capture System (250 Hz) and synchronized with GRF data (1000 Hz). The result shows that Model III has a more increased range of motion (ROM) than Model I and Model II. And the Lagrange energy has significant difference of at E3 and E4 (p<.05). This study can be concluded that there are differences in the three models of algorithm during the phase of load absorption. Especially, Model III shows proper spine motion for the inter-segmental joint motion with the interaction effects using the seven segments. Model III shows more proper observed values about dynamic equilibrium than Model I & Model II. The findings have shown that the dynamic stability strategy of Model III toward multi-directional spinal motion supports for better function of the inter-segmental motor-control than the Model I and Model II.

고령자 보행 시 좌우하지 간 Rocker based approach의 운동학적 변인분석

유경석(Yoo Kyoung-Seok),이승화(Lee Seung-Hwa) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.4

For the elderly, gait characteristics present data on the normal age-related changes in the self-selected walking speed. To better understand of the bilateral asymmetry in gait biomechanics, we quantitatively evaluated the spatial and temporal, kinematic parameters and rocker based approach of gait variables in older men group. Subjects were contacted at the Seoul Veterans Hospital in Seoul. The subjects were men who were no with experience of gait disorder and fall history in the normal 60~70 older age group, were excluded if the cause of their gait disturbance and neurological examination. The 3D motion measurement utilizes a Vicon 512(Oxford Metrics, Ltd., UK) as gait analysis system. Collected data were analyzed using a paired t-test by SPSS 12.0 Win program. As a results, step length was significant difference with bilateral gait symmetry(p<.05) on the spatial and temporal parameters in older group(n=15), but there were no significant difference walking speed, cadence, stride time, step time, single support and double support time, respectively. And the statistical significant results of kinematic motion analysis were as followings; hip joint parameters were H3(p<.05), H4(p<.05), and then ankle joint parameters were A1(p<.005), A2(p<.005), A3(p<.005) and A6(p<.005) in bilateral symmetry. but there was no one statistical difference of knee joint. As a rocker base approach, these rocker factors had significant correlation with bilateral symmetry in older adults especially both 2nd ankle rocker and 3rd forefoot rocker were measured in ankle joint(p<.005) and knee joint(p<.05). These data suggest that meaningful changes differ substantially results from between young adults and older adults in the kinematic parameters and rocker based approach of gait index. These findings underscore the idea that the gait change in older adults who the relationship between fear of falling and the observed gait changes in not well understood with welfare of the aged.

인체 척추움직임의 정량적 관측을 위한 운동학적 해석연구

유경석(Yoo, Kyoung-Seok),서승우(Suh, Seung-Woo),최성욱(Choi, Seong-Wook),공세진(Kang, Se-Jin) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.1

The purpose of this study was to compare and investigate the three spine models of three-dimensional kinematic spine motion during trunk movements in free normal gait by developing the spine coordinate system. A retro-reflective motion analysis system was used to measure spine motions, using three kinematic trunk models(Model I : one rigid, spine, Model II: lumbar-thoracic spine, and ModelⅢ: multi-segmental spine). Fifteen middle and high school students(age: 16.6+1.51 yrs, heights: 157±5.96 cm, weights: 45.5±4.88 kg) who have the idiopathic scoliosis were recruited as the subjects. Significant differences were noted m the total trunk motion measured between the three models. First, there was significant difference of the side-bending(p<.05) in sagittal plane during Post-hoc analysis of the ANOVA results for the three spine models. Second, the spinal column level of trunk motions revealed an differences of angular displacement during ROM(rang of motion) in frontal plane, sagittal plane and transverse plane of the multi-segmental model. These findings suggest that use of multi-segmental model provides the most interpretable findings, that is the combined movements and the couple movements allowing for differentiation of translation and rotation of x, y, 2 of three dimension in individual motion patterns.

V.R.공간인식에 의한 골프스윙 예상궤적 알고리즘의 연구

유경석(Yoo Kyoung-Seok) 한국체육과학회 2006 한국체육과학회지 Vol.15 No.3

Recently, developed virtual reality(VR) technique will be a suitable tool for the purpose of man-machine interface, because of the real time coordinate tracking ability in 3D space. It can produce both effects on the real time motion analysis and the control of motor skill during tracking the human motion that is position data (x, y, z) and rotation datatroll, yaw, pitch) in the space. The purpose of this study was to reduce an equation of estimate tracking golf swing, and to transform the data capture and crunching methods under the VR environments into the coordinate system, which used Cartesian coordinate system and Polar coordinate system in the biomechanical research. From understand the coordinate system of rigid body system, the conclusion of an equation of estimate tracking golf swing is as follows. Г₁= (p₁,(t). p₂(t). p₃(t)) Г₂=Г₁ + a(cosФ₁,(t) cosθ₁,(t). cosФ₁,(t) sinθ₁,(t). sinФ₁,(t)) Г₃= Г₂ + b(cosФ₂(t) cosθ₂(t), cosФ ₂(t) sinθ₂(t). sinФ₂(t)) Гj, =Гj + Xj(cosФj(t)cosθj(t). cosФj(t)sinθj(t) In the future, The possibility of the V.R techniques will be more expandable on the real time motion analysis and the control of motor skill under complex sport skill conditions in Biomechanics.

자세조절능력에 따른 뇌-척수 신경 반응기전의 역학적 해석

유경석 ( Yoo Kyoung-seok ) 한국체육학회 2019 한국체육학회지 Vol.58 No.6

이 연구의 목적은 외발서기 동작 시 취득한 운동역학데이터로부터 주파수분석의 기법을 통하여 인체 운동명령신호가 어떻게 자세조절 과정에 영향을 미치는지를 규명하는 자세역학의 토대연구이다. 이를 위하여 체조경력 10년 이상의 운동신경이 우수한 국가대표상비군(n=6)과 일반인(n=6)을 대상으로 발바닥 압력중심점(CoP)의 궤적데이터를 FFT신호처리기법에 의한 저주파대역 Rambling (RM)과 고주파대역 Trembling (TR)의 주파수분석을 탐색하였다. 본 연구결과에 따르면 눈뜨고 외발서기와 눈감고 외발서기 동작을 중심으로 두 집단 간 자세조절능력의 안정화지수 평가에서 독립표본 t검증에서 유의한 차이가 나타났으며(p<.05), 이러한 차이는 저주파대역 RM의 주요주파수 f₁과 고주파대역 TR의 주요 주파수 f₂의 최대진폭의 출력 차이로 밝혀졌다(p<.05). 특히 자세송환피드백에 관여하는 고유주파수인 저주파수대역에서는 주요주파수가 8-9 Hz 대역에서 뇌지시 하 안정적 자세조절의 운동기전을 행하는 운동명령으로 확인하였으며, 120-135 Hz의 고주파수대역에서는 자세 흔들림을 최소화하기 위한 반사적 근반응의 적응성을 보이는 것으로 연구되었다. 자세조절의 중추신경계 운동조절에 관여하는 고유주파수와 최대진폭에서 유의한 차이가 발견됨으로서 외발서기 시 발바닥 압력조절에 의한 신호파형의 운동명령이 자세조절에 영향을 미치는 것으로 해석되었다. The purpose of this study is to identify how postural mechanics affects postural control on balance and stability by using frequency analysis technique from the kinematic data acquired during the one leg standing posture. For this purpose, the experimental group consisted of two groups, the normal group (n=6) and the national Gymnastics group (n=6). Displacement data of CoP were analyzed by frequency analysis of rambling (RM) and trembling (TR) by FFT signal processing. As a results, there was a significant difference in evaluating the stabilization index between the two groups with the eyes open and closed one leg stnading (p <.05). The cause of the difference was found to be the output of the maximum amplitude of RM (f₁) and TR (f₂) (p <.05). In particular, in the low frequency RM of 8-9 Hz, which is a natural frequency of signal wave involved in postural feedback feedback, the main frequency appeared to be performs the exercise mechanism of stable brain posture control. And in the high frequency TM of 120-135 Hz, it is considered that the adaptation of the reflective muscle response is minimized to minimize posture shaking. In conclusion, this study provides evidence for the intrinsic main frequencies according to the postural control ability which affects the CNS in one leg standing.

최대스윙속도를 위한 인체링크분절계의 운동역학적 원리

유경석(Yoo Kyoung-Seok) 한국코칭능력개발원 2006 코칭능력개발지 Vol.8 No.4