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조진래,정현성,이홍우,김남전,김기운,Jo, Jin-Rae,Jeong, Hyeon-Seong,Lee, Hong-U,Kim, Nam-Jeon,Kim, Gi-Un 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.10
Automobile maneuverability and tire durability are significantly influenced by the sidewall tire contour. In order to improve these tire performances, it is very important far one to determine a sidewall contour producing the ideal tension and strain-energy distributions. However, these requirements can nut be simultaneously achieved by conventional non-interactive multi-objective optimization methods based on mathematical programming, because these exhibit the conflicting behavior each other, with respect lo the sidewall contour. Therefore, we execute the tire contour optimization fur improving the maneuverability and the tire durability using satisficing trade-off method.
Sidewall 반경변화에 따른 Carcass 장력분포 변동 추이에 관한 유한요소 해석
조진래,정현성,이홍우,김남전,김기운,Jo, Jin-Rae,Jeong, Hyeon-Seong,Lee, Hong-U,Kim, Nam-Jeon,Kim, Gi-Un 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
Tire performance is significantly influenced by the carcass tension distribution that is governed by the sidewall contour. To maximize the tire performance, it is very important for one to find the sidewall contour with the ideal tension distribution. But it is not easy to find such an optimal sidewall contour. Therefore, in order for a successful tire-shape optimization, we need to investigate how the change of sidewall radius influences on the carcass tension distribution. In this paper, we intend to numerically investigate the relation between the sidewall-radius change and the carcass tension distribution.
요통 여성 노인의 장애물과 이중 과제 보행 시 속도 및 입각기 시간 분석
조용호 ( Yong Ho Cho ),정현성 ( Hyeon Seong Jeong ),박래준 ( Rae Joon Park ),배성수 ( Sung Soo Bae ),김경 ( Kyung Kim ),권용현 ( Yong Hyun Kwon ),조혁태 ( Hyuk Tae Cho ),황윤태 ( Yoon Tae Hawng ) 대한물리의학회 2010 대한물리의학회지 Vol.5 No.4
Purpose:This study was to evaluate gait velocity and stance time on 5 conditions in elderly women and elderly women with LBP. The subjects were 70`s generation. Methods:The subjects are 20 divided into 2 groups. They measured gait velocity, stance-time. The 5 conditions were normal gait, 10cm obstacle gait, 25cm obstacle gait, dual 10cm obstacle gait, dual 25cm obstacle gait. The experimental period was between 2008/12 and 2009/2, Statistical analysis was used Repeated measurement for difference between conditions, independent t-test for difference in two groups. Subjects were countdown from 50 during dual task gait. Results:The results were as follow: there were significantly diffrerence 10cm obstacle velocity, dual 10cm obstacle velocity in two group. The others were not significantly differences. Velocity and stance-time were significantly difference in control group. In dual 25cm obstacle gait, velocity was difference of normal gait. Stance time was difference in 25cm obstacle gait, and dual 25cm obstacle gait. In Experimental group, velocity and stance-time were not significantly difference. But measured value of velocity was gradually decreased and stance time was increased. Conclusion:These results indicate that elderly people with LBP women are reduced gait ability in dual task, and obstacle condition, So they need to prevent falling in dual task, and obstacle gait and to train obstacle/dual tak gait.
전력기기용 고안정성 광섬유 CT 센서의 광 신호처리기 설계 및 구현
장남영,최평석,은재정,정현성,Jang, Nam-Young,Choi, Pyung-Suk,Eun, Jae-Jeong,Cheong, Hyeon-Seong 한국융합신호처리학회 2007 융합신호처리학회 논문지 (JISPS) Vol.8 No.3
본 논문에서는 PFOCS 형태의 전력기기용 고안정성 광섬유 CT 센서에 활용할 수 있는 광 신호처리기를 설계/구현하고 그 특성에 대하여 논의하였다. 본 논문에서 제작한 광 신호처리기는 PFOCS를 구성하는 광 부품에서 발생되는 광 손실이나 편광변화로 인한 출력 광의 강도 변화로 발생하는 측정 전류 오차를 줄이기 위해 사용된다. 또한, 광 신호처리기는 광전 변환부, 아날로그 신호처리부, 레벨 시프트 및 마이크로프로세서로 구성된 실시간 계측제어부를 일원화하여 소형/경량으로 제작되었다. 제작된 광 신호처리기의 특성 실험은, 전광섬유 소자로 구성된 PFOCS를 이용하여, 632.8nm 파장의 광원과 권선수가 약 1500인 솔레노이드에 전류를 인가해 $0{\sim}7,500A$의 범위에 대하여 수행하였다. 그 결과, 측정 전류의 선형성 오차는 1,000A에서 7,000A 범위에서 최대 1.7%미만, 평균 오차는 약 0.3% 미만으로 양호한 선형성을 보였다. In this paper, we have designed and implemented an optical signal processor in order to use in a fiber-optic current CT for electric equipments where its properties were discussed. The fabricated optical signal processor is used to reduce a measurement current error that induced by the effects of intensity variation in the optical output signal due to losses coming from optical components or polarization variation in a PFOCS. Also, the optical signal processor was fabricated in compact/lightweight with unification of opto-electronic transducer part, analog signal process part, and real-time measurement part consisted of a level shift and ${\mu}-processor$. The experiment of optical signal processor has been performed in the range of $0{\sim}7,500A$ using the PFOCS made all fiber-optic components. As a result of experiment, the linearity error of measurement current is less than 1.7% and its average error is less than 0.3% in the range of $1,000A{\sim}7,000A$.