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권승민,손영부,하종훈,유홍희,Kwon, Seungmin,Son, Youngboo,Ha, Jonghun,Yoo, Hong Hee 대한기계학회 2015 대한기계학회 논문집 C. 기술과 교육 Vol.3 No.2
최근 생활수준의 향상으로 인해 가정용 에어컨의 보급률이 꾸준히 증가함에 따라 품질에 대한 소비자의 눈높이 또한 점점 높아지고 있다. 과거에 소비자의 요구는 제품의 효율성에 집중되었지만 점차 저진동/저소음에 대한 부분으로 확장되고 있다. 에어컨의 압축기는 제품의 효율을 결정하는 주요한 부분이면서 동시에 진동/소음의 주된 원인을 제공하고 있다. 압축기에서 발생한 진동/소음은 압축기 케이스와 배관을 통해 주위 구조물로 전달되고 이들은 다시 구조기인 소음이나 2 차적인 진동을 유발하게 된다. 본 연구에서는 RecurDyn 을 이용해 압축기의 진동/소음에 영향을 미치는 모터의 가진력이 고려된 MFBD(Multi Flexible Body Dynamics) 해석 모델을 개발하였다. 개발된 모델을 이용하여 압축기의 진동/소음 특성을 조사하고 압축기에서 발생하는 진동을 계산하여 실험 결과와 비교하였다. Recently, noise reduction in room air conditioner has been one of the most important issues as well as cooling efficiency. A rotary compressor is widely used in room air conditioners. But, the rotary compressor is the dominant vibration/noise source in an air conditioner. A number of studies have been conducted on reducing rotary compressor vibration/noise through improving muffler and resonator design. However, a noise delivering path between compressor and pipe is not fully taken into consideration. In this paper, the vibration analysis model of rotary compressor is modeled using RecurDyn and experimental validation is presented.
골프 하프 스윙 수행 시 주의초점 피드백에 따른 상지의 동측사지간 협응구조
권승민 ( Seung Min Kwon ) 창조교육학회 2010 창조교육논총 Vol.12 No.-
The present study examined the effect of two different attentional focus feedback conditions (verbal extermal feedback and internal feedback) on contralatera inter-limb coordination structure of upper body. The participants were four collegiate students who had no prior experience with the experimental task and were all right handers. The expert was a member of KPGA with over ten years player careers. A JVC high speed camera and reflective makers were used to gather the data, and the data were analyzed by APAS analyze system. Then, this data were analyzed to compare coordination structures among a right shoulder angle, elbow angle and a wrist angle, a left shoulder angle, and elbow angle, wrist angle through Lab View 6.1. The results are as follows. Firstly, the external feedback group than internal feedback group showed the similar coordination patterns to the expert. Secondly, the external attentional focused feedback group showed the increased angle at the first section and last section, and this result was assumed that the participants could release their constrained degree of freedom as a result of the learning in order for more efficient swing.
권승민(Kwon, Seung-Min),조준행(Cho, Joon-Haeng) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.67
This research aims to evaluate causes of injuries that could occur in the landing process, using the dynamic postural stability index (DPSI), by examining drop jumps and countermovement jumps in the experimental condition, thus exploring ways for injury prevention. For this research, a total of 22 male collage students (age: 23.1 ± 1.7 yrs, height: 177.0 ± 5.7 cm, weight: 69.2 ± 5.7 kg) joined the experiment. Items for the measurement included the front and rear, the left and right and vertical ground reaction forces using a force platform (2000 Hz). With measuring the above items, the study evaluated anterior-posterior stability index, mediolateral stability index, vertical stability index and dynamic postural stability index. The result showed that the peak anterior GRF and peak medial GRF, APSI, and %APSI were high in the drop jump, with the time for the peak vertical ground reaction force being delayed. In the case of countermovement jump, which is a sequence of actions, it showed that the peak posterior GRF, loading rate, VSI, DPSI and %VSI were high.
변형된 고빈도 자기통제 피드백이 노인들의 케이볼 타격과제 학습에 미치는 영향
권승민(Kwon, Seung-Min),이승민(Lee, Seung-Min),이한우(Lee, Han-Woo) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.4
The purpose of this study was to examine different advantage of transformed self-controlled feedback onn high frequency(60%) and low frequency(10%). The task was gate ball stroke and the subjects were forty older adults(over 65 years old). There were four groups consisting of ten persons in each group. The four groups were transformed 60% self-controlled group, transformed 60% yoked group, transformed 10% self-controlled group and transformed 10% yoked group. Gate ball stroke scores (accuracy score) were recorded. For the acquisition phase, those scores were analyzed in a 4 (group) x 5(block) ANOVA with repeated measures on the last factor. Pre-test, retention test, and transfer test scores were analyzed in one way ANOVA. The results of this study that the transformed 60% and 10% self-controlde groups was more effective for improving the gate ball stroke score in the acquisition. In addition to transformed 60% self-controlled group was more effective for improving the gate ball stroke score in the retention & transfer test than the other groups. In conclusion, the analysis of gate ball stroke scores showed that the advatage of transformed high frequency self controled feedback is applied up to the older adults.