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옆문강도 및 측면충돌 성능을 고려한 알루미늄 도어 임펙트빔 최적화 연구
양지혁(Yang, Ji-Hyuck) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.5
최근에 많은 완성차 업계에서 차량 중량을 줄이기 위해 알루미늄 재질의 도어 임팩트빔을 사용하고 있으나, 이는 옆문강도 및 측면충돌 성능을 저하시킬 수 있다. 따라서 이 논문에서는 옆문강도 법규를 만족시키고 스틸 도어 빔 수준의 측면충돌 성능을 유지할 수 있는 알루미늄 빔의 최적화된 단면 형상과 설계수치를 제시하고자 한다. Recently, several vehicle manufacturers have used the aluminum side door impact beam in order to reduce the vehicle weight and costs. But, the aluminum impact beam may cause the reduction of the side door strength and the side impact capability. Therefore, this paper optimized the section dimension and section shape of the side door impact beam to satisfy the legislation of the side door strength and maintain the side impact capability as well as steel impact beam
압전 세라믹 실린더내의 동전형 균열에 대한 모드 I 세기 계수 결정
양지혁(Ji Hyuck Yang),이강용(Kang Yong Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
The fracture behavior of a penny shaped crack in a three dimensional piezoelectric ceramic cylinder with finite radius under in-plane normal mechanical and electrical loads is analyzed with the electric continuous boundary conditions of the crack surface. The potential theory and Hankel transform are used to obtain a system of dual integral equations, which is then expressed to a Fredholm integral equation. The singular mechanical and electrical fields and all sorts of field intensity factors of Mode I are obtained, and the numerical values of various field intensity factors for PZT-6B piezoelectric ceramic are graphically shown for a uniform load and a ring-shaped load, respectively. And the effects of the radius of the cylinder on various field intensity factors are obtained..
비축대칭 하중 하의 3차원 압전 세라믹 스트립내의 동전형 균열에 대한 세기 계수 결정
양지혁(Ji Hyuck Yang),이강용(Kang Yong Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
The behavior of a penny shaped crack in a three dimensional piezoelectric ceramic strip under non-axisymmetric in-plane normal mechanical and electrical loads is analyzed based on the continuous electric boundary conditions of the crack surface. The potential theory, Hankel transform and Fourier series are used to obtain the systems of dual integral equations, which are then expressed to Fredholm integral equations. The singular mechanical and electric fields and all sorts of field intensity factors of Mode Ⅰ are obtained, and the numerical values of various field intensity factors for PZT-6B piezoelectric ceramic are graphically shown for an uniform load and a pair of concentrated load, respectively.
한 대의 카메라와 Fiducial 마커를 이용한 SLAM
임현(Hyon Lim),양지혁(Ji Hyuck Yang),이영삼(Young Sam Lee),김진걸(Jin Geol Kim) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.4
In this paper, a SLAM (Simultaneous Localization and Mapping) method using a single camera and planar fiducial markers is proposed. Fiducial markers are planar patterns that are mounted on the ceiling or wall. Each fiducial marker has a unique bi-tonal identification pattern with square outlines. It can be printed on paper to reduce cost or it can be painted using retro-reflective paint in order to make invisible and prevent undesirable visual effects. Existing localization methods using artificial landmarks have the disadvantage that landmark locations must be known a priori. In contrast, the proposed method can build a map and estimate robot location even if landmark locations are not known a priori. Hence, it reduces installation time and setup cost. The proposed method works good even when only one fiducial marker is seen at a scene. We perform computer simulation to evaluate proposed method.