• 한국운동역학회지
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• 제23권2호
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• pp.109-116
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• 2013

The purpose of this study was to provide fundamental information for the enhancement of performance through kinematic analysis of cornering according to the radius of curve course in short track speed skating. To perform this study, six skaters: three narrow radius players(N, body mass: $56.0{\pm}7.2$ kg, height: $163.7{\pm}5.1$ cm, age: $21.3{\pm}1.5$ yrs) and three wide radius players(W, body mass: $61.0{\pm}9.5$ kg, height: $169.0{\pm}4.4$ cm, age: $20.0{\pm}1.7$ yrs). Three-dimensional motion analysis was performed on the section from the forth block starting to show the change of radius to the sixth block using eight infrared cameras(sampling frequency of 100 Hz for N and W players). The time of push-off was greater for N than for W(p<.05) while the radius of center of mass was greater for W than for N(p<.05). The flexion and extension of knee and hip joint were greater for N than for W(p<.05). The external rotation of left knee joint was greater for N than for W(p<.05). Based on the findings, a small radius by increasing the range of the flexion and extension of knee and hip joint with greater external rotation of left knee joint would be related to more efficient run at curve. It is expected that these results will be useful in developing a training program for enhancing performance of short track speed skating athletes.

• 한국융합학회논문지
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• 제11권9호
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• pp.163-168
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• 2020

이 연구의 목적은 스포츠클라이밍센터 이용객들이 인식하는 선택속성과 고객만족 및 재등록의사의 관계를 규명하는 것이다. 이를 위해 서울, 경기지역 소재 스포츠클라이밍센터 이용객들을 모집단으로 설정한 후 편의표본추출법을 이용하여 총 296부의 자료를 실제 분석에 사용하였다. 자료처리는 빈도분석, 탐색적 요인분석, 신뢰도 분석, 다중회귀분석을 실시하였다. 이를 통해 도출된 결론은 다음과 같다. 첫째, 선택속성 중 시설 요인은 고객만족에 정(+)의 영향을 미치며, 락커룸 요인은 부(-)의 영향을 미치는 것으로 나타났다. 둘째, 선택속성 중 지도자 관계 요인과 비용 요인은 재등록의사에 정(+)의 영향을 미치며, 직접적인 영향력은 비용 요인이 가장 큰 것으로 나타났다.

• 한국실내디자인학회논문집
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• 제19권6호
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• pp.3-10
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• 2010

The purpose of this study is to examine the state of utilization in sport facilities at a university and drew up the improvement plan for all students. To accomplish this work, the survey of the 445 students(male 221, female 224) were collected. The collected data were analyzed through the frequency analysis. All of sports facility is used for wide range of student who like to use as their leisure in order to learn variety experience for spending their spare time. Also sports facility of university accomplish social education function to all member of university. Having sports facility for university can also work as a promotion and new impression to people its university image as well as welfare for staff. Especially, excellent sports facility at university can provide public service to local people where university is located. Having sport facility at university is directly related to development of university in many way, university is required to implement effective program for operating sport facility at university.

• 한국운동역학회지
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• 제19권2호
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• pp.217-225
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• 2009

최근 들어 부강을 방지하고 경기력을 향상시킬 수 있는 스포츠화를 개발하기 위해 신체운동학과 생체역학을 반영한 연구가 전세계적으로 활발히 수행되고 있다. 하지만, 이러한 연구의 성골 여부는 스포츠화와 발의 동적 거동, 특히 착지 충격 특성 평가의 신뢰성에 절대적으로 좌우된다. 그 이유로는 코트 스포츠운동에 있어서 착지충격력이 예상치 못한 부상과 경기력의 주요한 요인이기 때문이다. 이 연구는 맨발과 대표적인 코트 스포츠화의 착지충격 특성을 평가하기 위해 유한요소 해석을 적용하였다. 사람의 발과 신발사이의 연계효과를 정확히 반영하기 위해 별도의 실험 데이터에 의존하지 않는 완전한 3차원 발-신발 FEM 모델을 생성하였다. 수치 시뮬레이션을 통해 FEM 모델의 신뢰성을 평가함과 동시에 여러 가지 스포츠화의 GRF, MIF 및 주파수 응답과 같은 착지충격 특성들을 분석하였다.

• 한국운동역학회지
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• 제22권3호
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• pp.261-268
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• 2012

The purpose of this study was to qualitatively analyze pressure intensity and the center of pressure(COP) trajectory according to shoe type. Subjects were ten first-year female university students. The EMED-AT 25/D(Novel, Germany) was used to measure pressure intensity and COP trajectory. The COP Excursion Index(CPEI) was used for within subject test design. Independent variables were bare feet and six types of shoes. Dependent variables were center of pressure trajectory and pressure intensity. Barefeet and five toed shoes had a similar pressure intensity and COP trajectory. COP trajectory for all other shoe types showed a medial wobble at the heel. Pressure intensity for all other shoe types was related to the structure of the shoes. In conclusion, different shoe types can not only affect gait, but they can also influence foot deformities, pain, and dysfunction.

• 한국운동역학회지
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• 제22권2호
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• pp.219-228
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• 2012

The purpose of this study was to investigate how induced fatigue of the ankle joint muscles affects the capability and recovery of postural control during single-leg stance in healthy adults. The study population included 22 randomly recruited men and women. Postural control was performed on single-leg stance with eyes open. Ankle joint muscle was fatigued by repeated heel raises. According to the results of this study, for the anteroposterior variables, both men and women showed significantly increased center of mass velocity and decreased center of pressure 95% edge frequency immediately after fatigue. For the mediolateral variables, both men and women showed significantly increased center of mass velocity and decreased center of pressure 95% edge frequency immediately after fatigue. For the total variables, both men and women showed significantly increased center of mass averaged-velocity immediately after fatigue, and also, the center of pressure 95% confidence ellipse area significantly increased in women. Postural control variables were not significantly different for men and women at any time (Pre, P0, P10, and P20). In conclusion, the gender does not affect the capability and recovery after induced fatigue of ankle joint muscles. The effect of fatigue found for the anteroposterior and the mediolateral variables in both men and women. Furthermore ankle joint muscle fatigue led to change of postural control strategy from an ankle joint strategy towards a hip joint strategy. These changes are believed to damage postural control. The ankle joint muscle recovered from fatigue within 20 min during single-leg stance.

• 한국운동역학회지
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• 제17권4호
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• pp.99-106
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• 2007

The gait instability in the elderly has been associated with age-related deterioration in physical strength and reducing the potential for elderly falls requires regular exercise. In 2005, National Center for Injury Prevention and Control(NCIPC) reported that most elderly falls occur during activities in daily living(ADL). To better reveal biomechanic mechanisms underlying age-related degeneration in gait stability, and to enhance the assessment of falls risk, an accurate quantification of a person's balance maintenance during locomotion is needed. Instantaneous orientation of the line connecting COP and COM can characterize whole body position with respect to the supporting foot during gait and the angle between this line and the vertical line passing through the COP known as a good assessment to detect the elderly gait instability. Therefore the purpose of this study was to investigate a 6-month walking exercise effects in reducing elderly fall risk factors by using COP-COM inclination angles. Twenty-two community-dwelling elderly participated this study. The participants performed a walking exercise(3 times/week, 1 hour/visit) for 6 months. Laboratory kinematics during walking was assessed at months 0, 3 and 6. Significant increased in gait velocity was found among periods(p=.011, $1.25{\pm}.03$, $1.32{\pm}.03$, and $1.39{\pm}.04\;m/s$ in 0-, 3-, and 6-month, respectively). Also, significant differences in anterior and posteriror inclination angles were found among the periods(p<.05; posterior inclination angles: $12.8{\pm}2.2$, $11.0{\pm}2.9$, & $10.9{\pm}1.9$; anterior inclination angles: $13.7{\pm}1.7$, $14.6{\pm}3.2$, & $1.46{\pm}.21$ in 0month, 3month, & 6month, respectively). These findings provide evidence of significant reduced fall risk factors of community-living older adults associated with a systematic walking program.

• 한국생명과학회:학술대회논문집
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• 한국생명과학회 2008년도 제49회 학술심포지움 및 국제학술대회
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• pp.22.1-22.1
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• 2008

• 한국운동역학회지
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• 제23권2호
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• pp.99-108
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• 2013

The purpose of this study was to analyze the kinematic characteristics of javelin to compare the characteristics between world elite athletes and local male athletes. The subjects selected 9 athletes out of total 13 athletes recorded more than 65 m in the preliminary and main competition participated in the 93rd National Sports Festival held in 2012. Three-Dimensional motion analysis using a system of 4 video cameras(Sony HXR-MC2000) at a sampling frequency of 60 fields/s was performed for this study. The Kwon3D 3.1 was used to obtain the three dimensional coordinates about the top, grip, end of javelin. And the kinematic factors of javelin calculated using Matlab2009a program. The resultant speed of javelin that affects directly to the record of performance showed 26.08 m/s indicated lower speed of about 2-3 m/s than world elite athletes. The release point appeared to have been made at the high of $1.79{\pm}0.07$ m of 99.8% of the height of the athletes. In terms of release angle, it was indicated average $33.0{\pm}3.81^{\circ}$ lower release angle compared to the world elite athletes. The attitude angle(up & down tilt angle, X axis) related to javelin indicated average $38.5{\pm}4.96^{\circ}$, its related attack angle average $5.5{\pm}5.11^{\circ}$, and yaw angle(sideslip, side attack angle) average $15.7{\pm}8.48^{\circ}$.

• Earthquakes and Structures
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• 제24권2호
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• pp.111-126
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• 2023

Highly reliable and versatile methods artificial intelligence (AI) have found multiple application in the different fields of science, engineering and health care system. In the present study, we aim to utilize AI method to investigated vibrations in the human leg bone. In this regard, the bone geometry is simplified as a thick cylindrical shell structure. The deep neural network (DNN) is selected for prediction of natural frequency and critical buckling load of the bone cylindrical model. Training of the network is conducted with results of the numerical solution of the governing equations of the bone structure. A suitable optimization algorithm is selected for minimizing the loss function of the DNN. Generalized differential quadrature method (GDQM), and Hamilton's principle are used for solving and obtaining the governing equations of the system. As well as this, in the results section, with the aid of AI some predictions for improving the behaviors of the various sport systems will be given in detail.