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배상규,윤수빈,김종원,이종경,박지원 대한물리치료학회 2022 대한물리치료학회지 Vol.34 No.4
Purpose: The purpose of this study was to investigate effects of the modified bent arm tornado exercise on weight shift movement and muscle activity of the impact section in the top of the drive swing. Methods: Twenty subjects were divided professional golfer group and amateur golf group. Subjects were required to complete following modified bent arm tornado exercise. The activity and weight shift of the gluteus group and lower extremity muscles between the two groups were measured and the Wilcoxon rank test was analyzed. Results: The distribution of weight shift in the professional golfer group was higher than that of the amateur golfer group (p<0.05). During the golf downswing of the professional golfer group, muscle activation of the lower extremities was higher than that of the amateur golfer group (p<0.05). The distribution of weight shift after exercise by the amateur golfer group was higher than before (p<0.05). Conclusion: We could confirm was increased significantly of muscle activity and weight shift by applying modified bent arm tornado exercise through this study. This result suggests that exercise is needed to improve weight shift.
저강성 서보 구동시스템을 위한PD.PID 속도제어기 설계
배상규(S.G. Bae),석줄기(J.K. Seok),이동춘(D.C. Lee) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
The purpose of this paper is to develop the straightforward design guidelines of PD/PID speed controller for industry servo drives with plug and play concept The controller gains are uniquely determined from the current control loop dynamics, speed loop delay, and mechanical parameters. In order to eliminate the mechanical friction uncertainties, an automatic PD/PI control mode switching algorithm is introduced using online spectrum analysis of motor torque command. The dynamic performance of the proposed scheme assures a fast tracking response curve with minimal oscillation and settling time over the whole operating conditions. For comprehensive comparison of conventional PI control scheme, extensive test is carried out on actual servo system.<br/>
유한요소해석을 이용한 자동차 시트 리크라이너 섹터투스의 분말 압축 성형
배상규(Sang-Kyu Bae),이정빈(Jung-bin Lee),김재영(Jae-Young Kim),김기선(Key-sun Kim) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
리크라이너는 자동차 의장부품 중 한 부분으로서 시트 등받이의 각도를 조절하는 기능을 가지며 이에 따라 안전성과 편의성에 밀접한 영향이 있다. 본 논문에서는 분말야금 공정으로 생산되는 리크라이너 Sector Tooth 부품을 유한요소해석 프로그램을 이용한 압축 해석 및 마찰계수에 따른 밀도의 비교해석을 수행하였으며, 이를 통해 분말야금 제품의 강도나 밀도 분포를 예측하여 우수한 품질의 제품을 생산하는데 기여할 수 있을 것으로 사료된다.