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RISS 인기검색어
- 검색키워드
- 저자 : 류지선 ( Ji-seon Ryu ) (검색결과 67 건)
- 무료
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류지선 ( Ji Seon Ryu ),이영선 ( Yong Sun Lee ) 한국체육대학교 체육과학연구소 2013 스포츠사이언스 Vol.31 No.1
The purpose of this study was to estimate the horizontal distance, finally aim of javelin, through a simulation which was set by motion equations that need release angle and attack angle at release for initial conditions. These initial conditions were used experimental data from a male javelin thrower of national team. In conclusions, There were within 5.9% of a deviation between a horizontal distance attained by a thrower and one estimated in a simulation technique. Intial conditions as well as release velocity which was regarded as constant in this simulation effected on the horizontal distances estimated in a simulation technique. When the release velocity set as a constant, the horizontal distance of simulation was as varied as release angle and attack angle. It accordingly suggested that release angle which was controlled by throwers themselves could used in performance.
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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
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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.
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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.
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류지선(Ji-Seon Ryu),이진숙(Jin-Sook Lee) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.10
This study is intending to look into the status of the hitherto established local governments light pollution control ordinance, and to use the ordinance status as basic data of ordinance enactment related to light pollution in time of its establishment and revision in accordance with regional characteristics of each local government for the time to come. This study conducted this research in a total of 3-phase research methods. 1) This study inquired into the direction of the research plan through the theoretical consideration and analysis of the preceding researches after setting up research objectives according to research background and purpose. 2) Targeting 11 local governments which are enforcing the hitherto established ordinance, this study surveyed the status of the light pollution control ordinance. 3) This study carried out the contents analysis of the ordinance in the method of doing a comparative analysis of each provision of the ordinance according to local governments. It’s hoped that on the basis of this research, local governments across the nation, which have not yet established the same ordinance, could minimize the damage to natural eco-system due to artificial lighting by promoting the urgent ordinance establishment suited for each region, and create human-oriented light environment by modifying various disorderly lighting environment.
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독서치료 프로그램이 중학생의 스트레스 인지와 반응에 미치는 영향에 관한 연구 - 그림책 조형활동을 중심으로 -
류지선,조미아,Ryu, Ji-Seon,Cho, Miah 한국비블리아학회 2014 한국비블리아학회지 Vol.25 No.4
This study aims to present the effects that a bibliotherapy program based on picture books and paper craft art activities had on middle school students' stress recognition and the changes in their reactions. To this end, we adopted an experimental research design model with pre/post-test measurements of stress recognition and reactions using first grade middle school students with emotional difficulties. The results show that a bibliotherapy program based on picture books and paper craft art activities does have significant effects on the stress recognition and reactions of middle school students. The 5 of 5 sub-domains of the stress recognition had significant difference. The sub-domains are: family environment, friends, study, teacher/school. The 6 of 7 sub-domains of the stress reactions except fatigue had significant difference. The sub-domains are: tention, frustration, anger, depression, somatization, aggression. 본 연구는 중학생을 대상으로 종이조형을 활용한 그림책 독서치료프로그램을 실시한 후 학생들의 스트레스 인지와 스트레스 반응에 어떠한 영향을 미치는지 파악하고자 수행되었다. 이를 위하여 정서적 어려움을 겪고 있는 것으로 밝혀진 중학교 1학년 학생을 대상으로 연구를 수행하였다. 연구결과, 종이조형을 활용한 그림책 독서치료 프로그램은 중학생의 스트레스 인지와 스트레스 반응에 효과적인 것으로 나타났다. 스트레스 인지의 하위요인 중 가정환경, 친구, 학업, 교사/학교는 모두 통계적으로 유의한 차이가 나타났다. 스트레스 반응의 하위요인에서는 피로를 제외하고 긴장, 좌절, 분노, 우울, 신체화, 공격성에 통계적으로 유의한 차이가 나타났다.
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