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류지선 ( Ji Seon Ryu ),임가영 ( Ga Young Lim ) 한국운동역학회 2015 한국운동역학회지 Vol.25 No.3
Objective : The purpose of this study was to determine the differences in the head and tibial acceleration signal magnitudes, and their powers and shock attenuations between flat-footed and normal-footed running. Methods : Ten flat-footed and ten normal-footed subjects ran barefoot on a treadmill with a force plate at 3.22m/s averaged from their preferred running speed using heel-toe running pattern while the head and tibial acceleration in the vertical axis data was collected. The accelerometers were sampled at 2000 Hz and voltage was set at 100 mv, respectively. The peak magnitudes of the head and tibial acceleration signals in time domain were calculated. The power spectral density(PSD) of each signal in the frequency domain was also calculated. In addition to that, shock attenuation was calculated by a transfer function of the head PSD relative to the tibia PSD. A one-way analysis of variance was used to determine the difference in time and frequency domain acceleration variables between the flat-footed and normal-footed groups running. Results : Peaks of the head and tibial acceleration signals were significantly greater during flat-footed group running than normal-footed group running(p<.05). PSDs of the tibial acceleration signal in the lower and higher frequency range were significantly greater during flat-footed running(p<.05), but PSDs of the head acceleration signal were not statistically different between the two groups. Flat-footed group running resulted in significantly greater shock attenuation for the higher frequency ranges compared with normal-footed group running(p<.05). Conclusion : The difference in impact shock magnitude and frequency content between flat-footed and normal-footed group during running suggested that the body had different ability to control impact shock from acceleration. It might be conjectured that flat-footed running was more vulnerable to potential injury than normal-footed running from an impact shock point of view.
오래달리기 시 시간 경과에 따른 지면 반력 성분의 Variability
류지선 ( Ji Seon Ryu ) 한국운동역학회 2014 한국운동역학회지 Vol.24 No.4
A study was conducted to investigate the possible effects of fatigue which was resulted from increased running time on the stability during a prolonged run. The purposes of this study were twofold: first, to determine the discrete and non-linear variability of GRF (ground reaction force) components between running times to know the body stability, and second, to determine the pattern between discrete and non-linear variability. Nineteens healthy young adult males served in this study as subjects who ran at their preferred running speed. GRF data for twenty strides were collected at 5, 65, and 125 minutes during run. Variance coefficient and Lyapunov Exponent techniques on the GRF data were used to calculate variability index for each of the running time conditions. There were no difference between discrete variabilities of three components of GRF, but non-linear variability of the Fz component of GRF was decreased by increasing running time (p<.01). No relationship was found between discrete and non-linear variability
류지선 ( Ji Seon Ryu ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.4
The purpose of this study was to determine the effects of high-heeled shoe on the quiet standing and gait balance. Twenty women (mean height: 161.6±3.3 cm., mean body mass: 53.8±6.3 kg, mean age: 23.8±2.7 yrs..) who were without history or complain of lower limb pain took part in this study. They were asked to stand quietly on a force platform for 30 sec and walk on it at their preferred walking speed (mean speed 3.14±0.5 km/hr.) with wearing three different high-heeled shoe, 3, 7, 9 cm high for collecting data. Data were randomly recorded to collect two trials for quiet standing and five trials for walking The parameters to have been analyzed for comparison between three conditions of the height of high-heeled shoe were COP(Center of Pressure) range, COP velocity, sway area, and free moment on the static balance and COP range, COP velocity, and free moment on the dynamic balance. In this study, high-heel height affected on the COP range and velocity in the ante-posterior direction during walking, dynamic balance, but didn`t affect on the quiet standing, static balance.
지속가능발전교육에 기초한 나눔 프로젝트 활동이 유아의 이타성 및 공동체의식에 미치는 효과
류지선(Ryu Ji Seon),김지은(Ji-eun Kim) 한국육아지원학회 2016 육아지원연구 Vol.11 No.2
본 연구는 지구의 사회적․경제적․환경적 문제들이 우리 생활 속에 직․간접적으로 나타나면서 유아 기부터 관심을 갖고 이를 해결하기 위한 노력의 일환으로 지속가능발전교육에 기초한 나눔 프로젝트 활 동을 구성하여 유아들의 이타성과 공동체의식이 함양될 수 있도록 하는데 목적이 있다. 지속가능발전교 육에 기초한 나눔 프로젝트 활동을 구성하기 위해 유네스코한국위원회(2014)가 제시한 지속가능발전교육 의 사회적․경제적․환경적 핵심요소를 기초로 하여 프로그램의 목표 및 기본방향을 설정하였고, 각 내 용에 가장 적절하다고 판단되는 활동을 21회로 구성하였다. 본 연구대상은 충청북도 C시에 위치한 M유 치원과 S유치원의 만 5세 유아 40명이다. 프로그램을 실시하는 동안 실험집단의 경우 본 연구의 프로그 램을, 비교집단의 경우 유치원의 누리과정 생활주제와 관련된 활동만 실시하였으며, 실험집단과 통제집단 간 차이를 알아보기 위해 t-검증을 실시하였다. 연구결과, 실험집단 유아의 이타성 및 공동체의식 점수는 비교집단 유아의 점수보다 유의하게 높은 것으로 나타나 지속가능발전교육에 기초한 나눔 프로젝트 활동 이 유아의 이타성 및 공동체의식에 긍정적인 영향을 미쳤음을 알 수 있었다. 본 연구는 유아들의 나눔 활 동 경험이 지속가능발전교육에 일조할 수 있음을 시사해 보고, 실제로 유아교육 현장에서 교사들이 지속 가능발전교육을 적용해 보고자 할 때 구체적인 정보를 제공할 수 있을 것으로 기대한다. In this study, sharing project activities that base on Education Sustainable Development(ESD) were constructed as a part of efforts to give attention from early childhood and provide solutions to social, financial, and environmental problems that cause direct and indirect influences in people's lives. The purpose of this study is to promote altruism and community spirit in young children through these activities. To organize ESD-based sharing project activities, the goal and the basic direction of the program were determined, based on the three key elements of Education for Sustainable Education presented by the Korean National Commission for UNESCO (2014). After choosing programthemes, in order to have children experience the three key elements:social, economic and environmental elements in ordinary life and 21 sessions of program including specific activities. which were considered to be most suitable for each content of the program, were carried out. This study was targeted at 40 young children aged 5 in M kindergarten and S kindergarten situated in C City, Choongcheongbuk-do. The program of this study was applied to the experimental group and only life themes of Nuri curriculum and daily program were applied to the control group. A t-test was conducted to find out the difference between the experimental group and the control group. The study findings are as follows. The experimental group showed a significantly higher score in altruism and sense of community than the control group. The study results show that thinking of ESD-based sharing and experiencing the sharing activities positively influenced children's altruism and sense of community by making themunderstand and help the needy.In conclusion, this study implies that children's sharing activity experience can contribute to Education for Sustainable Development and it is expected that this study can provide specific information when teachers apply Education for Sustainable Development to early childhood education.