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점탄성 재료를 이용한 샌드위치형 평판보의 진동 저감 효과에 관한 연구
전호민,이성수 대한건축학회지회연합회 2010 대한건축학회연합논문집 Vol.12 No.4
건축물의 바닥슬래브와 교량의 상판에 발생하는 진동은 구조체의 구조적인 안정성은 물론 구조물을 이용하는 사람들에게도 큰 영향을 주는 요소이다. 이와 같은 진동을 저감하기 위해 다양한 연구가 이루어지고 있다. 바닥슬래브는 바닥판 자체의 강성을 키우는 방법, 동조질량감쇠기(Tuned Mass Damper, 이하 TMD)등의 추가 장치를 이용하는 방법, 감쇠를 증가시키는 방법 등이 고려되고 있는 방법이라 할 수 있다. 이 가운데 감쇠를 증가시키는 방법은 시공측면이나 비용측면에서 가장 효과적인 방법이라고 할 수 있다. 이에 본 연구에서는 구조물의 감쇠에 대하여 알아보고 구조물의 감쇠를 증가시키는 방법 가운데 점탄성재료의 전단변형을 유도하여 외부의 에너지를 소산시키는 방법에 대하여 연구하였다. 점탄성재료는 폴리우레탄 재료를 사용하였으며, 보는 강재 평판보를 사용하였다. 샌드위치형 보는 위아래 철판사이에 점탄성재료를 삽입하여 부착하는 방법으로 구성하였다. 구조물의 동특성과 진동응답을 측정하기 위하여 동적신호분석기, 임팩트햄머 및 가속도계를 이용하여 실험을 실시하였다. 시간이력영역과 진동수영역의 응답을 이용하여 응답을 비교하여 샌드위치형 보의 효과를 제시하였다.
가진원에 따른 라멘 구조물의 수직진동 전달 동특성 변화에 관한 실험연구
전호민 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.4
In general, the vertical vibration problems for strength of members and serviceability of building structures are not considered in structural design process, but the prediction of the vertical vibration is very important and essential to structural design process.The vibration on building structures due to exciting vibration forces has been studied only for the vibration level on existing buildings. Recently, several researches have been performed on the prediction of vertical vibration on structures by using an analytical method. However, these studies have been focused on mainly the vibration analysis through analytical modeling of structures. This study aims to investigate the dynamic characteristics of vertical vibration transfer from lower stories to upper ones on the Rahmen building structures due to 2 type vibration forces. This investigation could be utilized to estimate the base data of the characteristics of vertical vibration transfer on the structures due to traffic loads in the future. In order to examine the characteristics of vertical vibration transfer, the mode analysis and the impact experiment were conducted several times on three building structures.The results of this study suggest that the characteristics of vertical vibration transfer are very different in terms of the directions of transfer(upward transfer and downward transfer).
실시간 심박수 검출을 통한 효율적인 운동량 측정 알고리즘 설계
田昊敏,崔祐榮 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
In this paper, we proposed a real-time heart rate detection and excercise measurement algorithm. Calculation time and memory requirement for the heart rate detection algorithm have been minimized by using every 2 seconds ECG data. It can applicable to the portable equipment and helpable fur a person to build a more effective exercise program.
발 뒤꿈치 충격에 의한 전단벽식 공동주택 수직진동의 수직방향 진동전달 특성
전호민,이성수 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.4
The vibration on building structures due to exciting vibration forces has been studied only for the vibration level on existing buildings. Recently, several researches have been performed on the prediction of vertical vibration on structures by using an analytical method. However, these studies have been focused on mainly the vibration analysis through analytical modeling of structures. This study aims to investigate the characteristics of vertical vibration transfer in terms of the directions of transfer(upward transfer and downward transfer) on the shear wall building structures due to heel-drop impact forces. In order to examine the characteristics of vertical vibration transfer, the mode analysis and the impact experiment are conducted several times on three shear wall building structures. The results from the experiments are analyzed and compared with the results. The results of this study suggest that the overall vibration level in the lower floor is decreasing on the path of the vibration transfer to mid floor, but the overall vibration level in the mid floor is increasing to upper floor. The characteristics of vertical vibration transfer are similar in terms of the direction of downward.
전호민,최우영 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
The several algorithms to detect circular boundaries from a digital image by Hough transform have been recognized as a robust technique. However, the algorithms are limited by slow speed and excessive memory. In this paper, a fast algorithm to detect the circular object with unknown radius is proposed. In this algorithm, the divide-and-conquer method is applied to reduce the computation time by using the property of area of cumulated points by the Hough transform. And the requirement of memory can be limited to the one 2-dimensional array of which size is the same as the source image. Experimental results show that the proposed algorithm gives better performance in comparision with Davies' Hough transform algorithm.
전단벽식 공동주택의 부재 물성치 및 크기 변화에 따른 슬래브 수직진동 저감 효과
전호민,유승민,Chun Ho-Min,Yoo Seung-Min 한국주거학회 2006 한국주거학회 논문집 Vol.17 No.3
Vertical vibrations on the slab of buildings are affected by types of vibration sources, transfer paths, and the material property and the size of members. Among these parameters, the vibration sources and the transfer path can not be controlled, but the property and the size of members can be controlled in the phase of design the members. In this study, the vibration responses according to the property and size of members were obtained by using a prediction program based on dynamic-stiffness matrix. Three parameters which are not usually considered as major factors for architecral planning were selected fur these analyses. They are the strength of materials, the thickness of wall and the thickness of slab. The ground vibration source located near a building was used as vibration input data in the analyses. This study has its originality on presenting appropriate property and size of structural members in order to reduce vertical vibration of slab in shear-wall structures. Analysing the results from the vibration estimation program according to the variations of parameters, the appropriate ratio among the sizes of structural members were proposed. From these results, the vibration level on the slab which is not constructed yet would be predicted and the vibration peak level can be reduced or shifted into the desirable frequency range. Therefore, the vertical vibration could be controlled in the phase of designing buildings.