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풍 하중과 Pitch각 변화에 따른 풍력 터빈 블레이드의 안정성 해석
권승민(Kwon, Seung Min),강문정(Kang, Moon Jeong),유홍희(Yoo, Hong Hee) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.12
Recently, researches related to the green energy generation systems have increased significantly. Among them wind turbines are the most spread practical green energy generation systems. In order to enhance the power generation capacity of the wind turbine blade, the length of wind turbine blade has increased. It might cause undesirable excessive dynamic loads. Therefore dynamic characteristics of a wind turbine blade system should be identified for a safe design of the system. In this study, the equations of motion of a wind turbine blade system undergoing gravitational force are derived considering wind force and pitch angle. Effects of wind speed, variation of pitch angle of the wind turbine blade, rotating speed, and the blade length on its stability characteristics are investigated.
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.
한 개의 크랙을 가진 회전하는 패킷 블레이드 시스템의 진동해석
권승민(Kwon, Seung-Min),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.12
In this paper the vibrational behavior of a multi-packet blade system having a cracked blade is investigated. Each blade is assumed as a slender cantilever beam. The coupling stiffness effect that originates from either disc flexibility or shroud is considered in the modeling. Hybrid deformation variables are employed to derive the equations of motion. The flexibility due to crack, which is assumed to be open during the vibration, is calculated basing on a fracture mechanics theory. In the paper, the results of the change in modal parameters due to crack appearance are presented. The influence of the crack parameters, especially of the changing location of the crack is examined.
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.
Structural Method 을 이용한 Superimposition Part 1 : Facial Superimposition
권승민(Seung Min Kwon),이영미(Young Mi Lee),오용덕(Yong Duck Oh),양희상(Hi Sang Yang),박금석(Geum Seok Park),박관수(Kwan Soo Park),김중한(Joong Han Kim),윤영주(Young Jooh Yoon),김광원(Kwang Won Kim) 조선대학교 구강생물학연구소 1997 Oral Biology Research (Oral Biol Res) Vol.21 No.1
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