편마비 장애인의 평형 유지를 위한 건측 하지 및 시각정보 활용 특성

문제헌(Moon, Je-Heon) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3

The purpose of the study was to analyze the effect of visual information and contralateral limb coordination on balance characteristics among patients with a hemiplegic disability. A total of twentyeight participants were recruited as subjects. For experimental group, fourteen patients with hemiplegia disability (age: 53.9±6.3 yrs., height: 1.69±.04 m, weight: 72.4±4.7 kg, level of lesion 2-3 grade) and for control group, fourteen participants from general population (age: 52.1±5.6 yrs., height: 1.64±.11 m, weight: 74.7±5.8 kg) were recruited. The subjects were instructed to maintain balance under two tasks (while maintaining balance with both feet, with one foot) and two visual conditions (with or without visual information). The conclusion obtained after analyzing the effect of visual information on the center of pressure distribution, average velocity, peak velocity are as follows. First, the resultant velocity of the center of pressure was higher among hemiplegia patient than the control group. Second, the ability to maintain balance during one-foot balance condition significantly reduced when no visual information was provided in both groups. Third, the ability to maintain balance by hemiplegia patient group during one-foot balance task was better than the control group.

여자 멀리뛰기 대표선수의 기술 분석과 체력 측정을 통한 훈련 성과 평가

문영진 ( Young Jin Moon ),이순호 ( Soon Ho Lee ),문제헌 ( Je Heon Moon ) 한국스포츠정책과학원(구 한국스포츠개발원) 2013 체육과학연구 Vol.24 No.1

The objective of this study is to understand the advantages and disadvantages on long jump technique by performing kinematic analysis periodically on it with a focus on Player J. She is a women`s long jumper of the South Korean national team and was qualified for the IAAF World Championships Daegu 2011, and to set the direction of training by comparing with the top athletes in the world. Thus, this study performed kinematic analysis on four athletics competitions for ten months with a focus on a South Korean long jumper, Player J. In addition, this study performed kinematics analysis on the IAAF World Championships Daegu 2011 and analyzed the data of previous studies in the two athletic competitions in order to compare with other excellent athletes. The conclusion reached by the results and discussions of this study is as follows. First, it showed that the horizontal velocity of Player J reached the level of other excellent athletes by continuous training but the contact time with take off board was shorter than them at take off. Second, it is necessary to maintain the center of mass low in the B2 and last sections after the runway and to approach the support foot to the take off board while shortening the stride. Third, intensive training is required so that it is possible to convert the horizontal velocity to the vertical velocity while maintaining more than 9m/s to the in the last section. Fourth, efforts should be made so that the take off angle can be at least 20 degrees or more. In conclusion, it is necessary to enter the B3 phase with maintenance of the horizontal velocity at more than 9m/s and to maintain the center of mass low in the B2 phase order to improve the record of Player J. In the last phase, it is expected that the contact time with the take off board will increase and the records will be improved when training with a focus on the technique that raises the center of mass vertically after bending knee joints as much as possible. 이 연구는 2011년 대구세계육상선수권대회 출전 자격이 있는 여자 멀리뛰기 국가대표 J를 대상으로 멀리 뛰기 기술에 대한 운동학적 분석을 주기적으로 수행하여 기술에 대한 장단점을 파악하고 세계 상위권 선수들과 비교분석하여 훈련방향을 설정하는데 목적이 있다. 이에 이 연구는 대표팀 여자 주전 선수 J를 중심으로 10개월 간 4개 대회를 중심으로 운동학적 기술동작 분석 및 전문체력 측정 평가를 통한 현장지원을 실시하였다. 운동학적 기술동작 분석 결과는 국제 우수 선수와 비교분석을 위하여 2010년 대구국제육상 선수권대회의 운동학적 분석과 2011년 대구세계 육상선수권대회 등의 선행연구 자료를 비교 분석하였다. 이 연구의 연구 결과와 논의를 통하여 얻은 결론은 다음과 같다. 첫째, J의 수평속도는 지속적인 훈련에 의하여 우수 선수 수준에 근접하였으나 도약 시 보드 접촉 시간이 짧은 것으로 나타났다. 둘째, 주로 구간을 지나 B2 구간과 Last 구간에서 신체중심을 낮게 유지하고 보폭을 줄이면서 발구름판 가까이 지지하는 발을 접근시키는 동작이 필요하다. 셋째, Last 구간에서 9m/s 이상의 수평속도를 유지하면서 수직속도로 전환시키는 기술에 대한 집중훈련이 요구된다. 넷째, 이륙각을 최소 20도 이상이 되도록 훈련해야 기록 향상이 기대된다. 결론을 요약하면 J의 기록 향상을 위해서는 9m/s 이상의 수평속도를 유지하고 B3 구간에 진입하여 B2 구간에서는 신체중심을 낮게 유지하는 자세를 취해야 한다. Last 구간에서는 슬관절을 최대한 굴곡시킨 후 수직방향으로 신체중심을 상승시키는 기술동작에 초점을 두고 하지 신전근과 굴곡근의 근력을 강화할 수 있는 훈련을 통하여 보드 접촉 시간의 증가와 함께 기록 향상이 기대된다.

역도 인상 동작 시 중량 증가에 따른 하지근육의 길이 및 수축 속도 변화

문영진 ( Young-jin Moon ),문제헌 ( Je-heon Moon ) 한국스포츠정책과학원(구 한국스포츠개발원) 2017 체육과학연구 Vol.28 No.1

[목적] 본 연구의 목적은 역도 인상동작 시 중량 증가와 하지근육의 길이 변화를 관찰하여 주동근을 확인하고 근 수축 속도를 분석을 통하여 빠른 근 수축이 필요한 근육을 밝히는 것이다. [방법] 연구대상자는 국가대표 역도선수 10명으로 이들의 평균 연령은 29±3.84 yrs, 체중 71.3±16.04 kg, 신장 1.63±0.07 m, 인상 최고기록 128±36.30 kg이다. 실험은 개인 최고기록의 70%, 80%, 90% 중량으로 인상 동작을 수행하는 동안 동작분석을 실시하였다. 분석 변인은 근 길이와 근 수축 속도이며 생체역학 모델링에 의하여 산출하였다. 통계처리는 바벨 중량 증가(최고기록의 70%, 80%, 90%)와 근육에 따른 종속변인(하지 각도, 각속도, 근육의 길이, 수축 속도)의 차이를 분석하기 위하여 반복측정 이원분산분석(repeated measure with one-way ANOVA)을 실시하였다. [결과] 연구결과에 의하면 중량 증가에 따른 하지 각도 이동범위, 최대 신전 각속도, 근 길이 차이는 나타나지 않았다. 하지만 근육 간 길이 비교에서는 대퇴 근육에 해당하는 내측광근, 외측광근, 대퇴이두근, 대퇴직근의 길이 차이가 다른 근육 길이 차이 보다 높아 주동근으로 예상된다. 인상 동작 시 빠르게 동원되어야 하는 근육을 확인하기 위해 수행한 근 수축 속도 분석한 결과에 의하면, 대퇴직근, 내측광근, 외측광근, 대퇴이두근이 그 대상으로 나타났다. [결론] 인상동작에서 주동근은 대퇴 주변의 근육이고 대퇴이 두근과 대내전근의 동시수축은 경기력 향상에 기여할 것이다. [Purpose] The purpose of this study was to identify the lower extremity muscles length change according to the increase of the weight during snatch. Also, through the muscle contraction velocity analysis, it is necessary to identify muscles that require rapid muscle contraction. [Methods] The subjects were 10 national weight-lifters. Their mean age was 29 ± 3.84 yrs, body weight 71.3 ± 16.04 kg, height 1.63 ± 0.07 m, and the highest recorded height 128 ± 36.30 kg. Experiments were performed during the snatch to 70%, 80%, and 90% of the individual highest records. The analysis variables were the lower extremity angle, angular velocity, muscle length and muscle contraction velocity and were calculated by biomechanical modeling. Statistical analysis was performed with a repeated measure with one-way ANOVA to analyze the difference between the increase weight (70%, 80%, 90% of peak) and the dependent variable (angel, angular velocity, muscle length and muscle contraction velocity). [Results] According to the results of the study, there was no statistical difference in angle, angular velocity and muscle length with increasing weight. However, in the comparison of the muscle length, muscle length of the vastus medialis, vastus lateralis, biceps femoris, rectus femoris were statistically higher than other muscles. Also muscle contraction velocity of the rectus femoris, biceps femoris, vastus medialis, vastus lateralis, rectus femoris were statistically higher than other muscles. [Conclusion] In the snatch, the dominant muscles were the muscles around the femur, and the co-contraction of biceps femoris and great adductor muscles would contribute to improve the performance.

성인의 하향계단 보행 시 중량에 따른 하지의 운동역학적 변인 분석

문제헌 ( Je Heon Moon ),천영진 ( Young Jin Chun ) 한국운동역학회 2013 한국운동역학회지 Vol.23 No.3

The purpose of this study was to analyze the effect that various loads have on the lower limb biomechanics. The following variables were measured and analyzed; performance time for each phase, lower limb moments and joint angles, and ground reaction forces. The kinematic and kinetic data was recorded by 2 force platforms and a motion capture system while 12 healthy adults in their twenties stepped down three steps under loads of 0%, 10%, 20% BW. Results are as follows. First, the different loading conditions did not seem to significantly affect the performance times and the joint angles. Second, the largest ground reaction forces were observed at the 1 step at the 10% BW condition. Finally, at the 0% BW loading condition the right hip extension moment was the smallest and the left hip flexion moment was the largest. The results show that there are not any significant changes in the biomechanics of the lower limbs under loading conditions up to 20% BW. Further investigations including more loading conditions with more weights and more additional steps analyzed are needed.

이미지 프로세싱 기반 탁구공 자동추적 프로그램 개발

문제헌 ( Je-heon Moon ),이승훈 ( Seung-hun Lee ),이주성 ( Ju-sung Lee ),마니쉬 ( Panday Manish ),구스타보 ( Gustavo Adrian Ruiz Sanchez ),시다르타 ( Siddhartha Bikram Panday ) 한국스포츠정책과학원(구 한국스포츠개발원) 2020 체육과학연구 Vol.31 No.2

[목적] 본 연구의 목적은 탁구 전술 수립을 위한 정보를 신속하기 획득하기 위해 이미지 프로세싱 기술을 활용하여 탁구공의 이동궤적을 추적할 수 있는 알고리즘과 소프트웨어를 개발하는데 있다. [방법] 컴퓨터 비전 분야에서 사용하고 있는 알고리즘을 탁구 동호인 2경기와 국제대회 2경기에 적용하고 보완하였다. 개발한 소프트웨어를 통해 자동으로 획득한 구역별 탁구공 바운스 빈도와 수기로 획득한 빈도를 비교하는 신뢰도 분석을 수행하였다. [결과] 동호인 2경기의 평균 신뢰도는 85.1±3.69%, 합계 오류 14.9±3.69%로 나타났고 과대추정 오류 52.2±9.78%, 과소추정 오류 47.8±9.78%이다. 국제대회 2경기의 평균 신뢰도는 71.8±0.87%, 합계 오류 28.2±0.87%, 과대추정 오류 82.0±8.03%, 과소추정 오류 19.2±7.75%이다. [결론] 본 연구에서 개발한 알고리즘과 소프트웨어의 목표 신뢰도는 80%로 동호인 경기에서만 달성하였지만 국제대회 경기의 경우 대체적으로 과대추정 오류가 높아 추후 개선할 수 있는 가능성을 보여줬다. [Purpose] The purpose of this study was to develop algorithms and software that can track the trajectory of table tennis balls using image-processing algorithms to obtain information quickly for under and establish tactics used in table tennis. [Methods] The algorithms used in the field of computer vision were applied on two matches played by novice and two matches during international competitions by elite athletes. Reliability analysis was performed by comparing the table tennis ball bounce frequency in each zone obtained through the automatic method and the manual method. [Results] The mean reliability of the two novice games was only 85.1 ± 3.69%, total error was 14.9 ± 3.69%, overestimation error was 52.2 ± 9.78%, and underestimation error was 47.8 ± 9.78%. While the mean reliability of the two international tournaments was 71.8 ± 0.87%, the total error was 28.2 ± 0.87%, overestimation error was 82.0 ± 8.03%, and underestimation error was 19.2 ± 7.75%. [Conclusion] Although the target reliability of algorithms and software developed in this study was achieved only in novice competitions with 80%, the over-estimation errors were generally high in international competitions, showing the potential for further improvement.

CAPM을 이용한 제1기 신도시 아파트 수직증축 리모델링의 위험-수익 분석

문제헌(Moon, Je-Heon),김갑열(Kim, Gab-Youl) 한국도시행정학회 2014 도시 행정 학보 Vol.27 No.1

본 연구는 주택법 개정으로 2014.4.25.부터 수직증축 리모델링이 가능해 진 제1기 신도시(일산, 분당, 평촌, 산본, 중동)의 아파트시장이 CAPM 이론에 부합하는지를 분석하고 그 결과 수직 증축분의 분양가 결정 측면에서 시사점을 찾는데 목적이 있다. 분석방법은 제1기 신도시 5개 지역을 하나의 시장으로 보고 Black ?Jensen ?Scholes의 연구방법론에 따라 증권시장선(SML; Securities Markets Line)과 증권특성선(SCL; Securities Characteristic Line)을 각각 구한 후 양자가 통계적으로 일치하는지를 살펴본다. 분석결과 SML과 SCL은 통계적으로 일치하지 않은 것으로 나타나제1기 신도시 아파트 시장에는 CAPM 이론이 적용되지 않음을 확인할 수 있었다. 따라서 제1기 신도시 아파트는 투자재로서의 기능보다 소비재로서의 역할에 부합하므로 향후 허용되는 수직증축 리모델링 시 과도한 분양프리미엄이 책정되지 않도록 공급자, 수요자 및 정책당국의 노력이 필요하다고 판단된다. The purpose of this study is to analyse whether markets of the first-new-town(Ilsan, Bundang, Pyungchon, Sanbon, Joongdong) apartment which is able to act vertically extended remodelling from 25th March 2014 according to the amendment of Housing Act coincide CAPM theory or not, and to find an application in respect of deciding the price of parcel remodelled as a result of the analysis. Analytical method is to confirm statistically the same SML(Securities Market Line) as SCL(Securities Characteristic Line) complying with research methodology of Black?Jensen?Scholes regarding five regions of the first-new-town apartment as one whole market. On analyzed result, SML and SCL are not same statistically, and so it is possible to say that CAPM is not adapted to the first-new-town apartment market. That is, the first-new-town apartment is corresponded to more function of consumption goods than that of investment goods, therefore it is considered that supplier, demander and policy maker should effort not to set a excessive parcel price on would-be vertically extended remodelling.

편마비 보행 지지구간에서 건측 하지분절의 운동역학적 에너지 평가

이순호 ( Soon Ho Lee ),문제헌 ( Je Heon Moon ) 한국스포츠정책과학원(구 한국스포츠개발원) 2012 체육과학연구 Vol.23 No.4

이 연구는 대조군 5명과 실험군 5명를 대상으로 편마비 환자의 건측 하지의 지지구간에서 일어나는 하지관절의 역학적 에너지를 평가하는데 목적이 있다. 지지구간의 평균 소요시간에서, 실험군은 대조군에 비해 178.2%의 비율로서 더 길게 나타났다. 하지관절의 가동 범위에서, 실험군은 대조군에 비해 발목, 무릎 그리고 고관절에서 더 큰 범위로 나타났다. 하지관절의 근 모멘트 역시 실험군은 대조군에 비해 더 큰 굴근 모멘트와 신근 모멘트로 나타났다. 실험군은 무릎관절 근 모멘트에서 중간지지기 이후 큰 굴곡 모멘트가 나타났고, 고관절 근 모멘트는 P1 구간에서 신전 모멘트가 더 크게 나타났다. 실험군에서 P2 구간의 큰 지지 모멘트는 중간지지기가 시작되면서 과다한 양적 일과 음적 일이 발휘되어 서로 상쇄되는 보상동작으로 평가된다. 이와 관련하여 하지관절의 근 파워에서, 실험군은 대조군에 비해 양적 일과 음적 일이 더 크게 나타났다. 건측 하지는 장애측 하지에 대한 주동근 역할로서의 보상동작이며, 이러한 보상동작은 한 관절에서 에너지를 발생하고 다른 관절에서 에너지를 흡수하는 과정의 평형을 이루기가 어려워진다. The purpose of this study was to assess the mechanical work done of healthy support leg in hemiolegia gait. Ten subject were split into two groups of five , an experimental and control group. For the mean time of support phase, the experimental group was ratio of 178.2% longer than control group. For the Rom of supporting leg`s joint, the experimental group had a larger ROM at the ankle, knee and hip joint angle. The experimental group`s lower limb extensor and flexor moment of force was larger than control group. For the knee moment, is was shown that the maximum flexor moment of force in experimental group occurred after middle support phase. Similarly the hip extensor moment of force was larger than flexor moment of force during the phase 2. As the experimental group had larger moment force during the second phase, it is believed to because of strategy of compensation. This study shown that experimental group requires more power as they need to compensate for the lack of strength and control, which is a well known characteristic of hemiplegic gait.

높이에 따른 두발 착지동작 후 점프동작 시 무릎관절의 부하 변화

이진택(Lee, Jin-Taek),문제헌(Moon, Je-Heon) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.4

The purpose of the study was to analyze the biomechanical changes of the knee joint according to the increase of the landing height and the leg dominance to investigate the effect on the factors of anterior cruciate ligament (ACL) injury. The subjects were 19 male college students majoring in physical education with an average height of 73.4±4.56 cm, body weight of 66.9±6.08 kg, and age of 22.1±1.03 yrs. Experiments were carried out by double-leg landing from a wooden box of 20, 40, and 60 cm height of which three dimensional position data and ground reaction force data were collected during the maneuver. Inverse kinematics and dynamics algorithms were used to calculate the velocity of center of mass, the knee angles, the shear force, and the moments. The results obtained are as follows. First, the descending velocity of center of mass increased with landing height, but there were no difference in knee angles. Second, the maximal knee shear force increased with the landing height, but it was significantly lower than the ACL injury threshold level. Third, the knee joint moments increased with the landing height. It is expected that with increased knee adduction moment, a higher load will be applied to the ACL.

테니스 단식 경기에서 영상분석을 활용한 발리와 패싱샷의 성공 요인 분석

천영진(Chun, Young-Jin),문제헌(Moon, Je-Heon) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.1

The purpose of this study was to analyze the success and failure factors of volley when approaching net after approach shots and then analyzing success factors of passing shots in tennis male singles competition. For this purpose, we conducted three-dimensional image analysis of thirteen rallies in volley and passing shots for two games of Sangjoo open tennis tournament in 2015, and the following conclusions were obtained. First, volley player have to approach shots deeply to allow passing shots behind the end line, and then quickly approach the net to be able to volley. Second, the passing shot player should have a passing shot to be able to play in a low volley, and it is effective to make the direction to the backhand direction rather than the forehand. In future studies, it is necessary to analyze more number of cases, and to add statistic to the difference between success and failure of volley and passing shot.

탁구 포핸드 드라이브 시 비주동팔의 통제가 골반, 몸통, 상완, 라켓의 회전 및 체중 이동에 미치는 영향

김혜영(Kim, Hye-Young),문제헌(Moon, Je-Heon),변경석(Byun, Kyung-Seok) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2

The purpose of this study is to examine the effects of control over the non-playing arm on the weight shift and the rotation of the pelvic, trunk, upper arm, and the racket at the forehand drive of table tennis. And based on the analysis results, the study has drawn the following conclusions: To sum up results, at WLA, the trunk and the upper arm were not sufficiently rotated in E1, so there was lack of warm-up to increase the rotatory power. And this led to the lack of rotation in the pelvic and the trunk in E2. Also, at WLA, each segment’s ROM was less than NOR, which means that control over the non-playing arm restricts the motions of the pelvic, trunk, and the upper arm. Because of that, at WLA, the angular velocity of the proximal segment failed in forming a whip-like pattern transferring to the distal segment and maximizing the rotatory power. Therefore, WLA showed slower linear velocity of the racket than NOR. In addition, there was lack of rotation to the swinging direction, so the weight shift from the right to the left foot was not properly made and the weight was not loaded properly to give impact.