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송승관(Seung Kwan Song),김경주(Kyoung Joo Kim),이신호(Shin Ho Lee),박진배(Jin Bae Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
반사형 전동 블라인드는 BEMS(Building Energy Management System)에 이용되는 조명 에너지 절감 장치로서, 블라인드 날개를 반사형 재질로 제작하여, 외부 채광이 블라인드 날개에 반사 되어 천장에 반사되고 반사된 빛은 천장에서 확산되어 실내 깊숙이 부드럽고 균일한 조도를 공급해 준다. 이를 이용하면, 실내 거주자의 불편함 없이 실내 인공조명 사용량을 줄일 수 있다. 이를 구현하기 위해서는 태양광선의 고도의 변화에 따라 블라인드의 제어 각도를 계산하여 블라인드 제어 전동 모터를 구동해야 한다. 따라서 본 논문에서는 외부 채광을 실내 천장 면에 균일하게 반사할 수 있는 블라인드 날개의 제어 각도의 최적 조건을 제시하고, 컴퓨터 시뮬레이션을 통해 제시한 블라인드 날개 각도의 최적성을 검증하였다.
Dual-fingered stable grasp with minimum friction angle
송승관(Seung Kwan Song),최윤호(Yoon Ho Choi),박진배(Jin Bae Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In this paper, we propose a control method for stable grasp of dual-fingered robots with hemispherical finger-tips. The main contribution of the proposed approach is to lower the probability of the object slipping out of finger-tips as minimizing the friction angle. In addition, the shape of an object is not limited to the proposed controller as long as the contact point is positioned on the vicinity of smooth curvatures. The controller requires no object information and no force sensors but joint angles, joint angular velocities, contact points from the tactile feedback and the kinematic information of fingers. We prove the stability analysis of the proposed controller via Lyapunov direct method. Finally, we present simulation results to validate the effectiveness of the proposed approach.
송승관(Song, Seung-Gwan),곽동희(Kwak, Dong-Hee),김창부(Kim, Chang-Boo) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.2
In this paper, we present the equations of motion by which the natural vibration of a rotating annular disk can be analyzed accurately. These equations are derived from the theory of finite deformation and the principle of virtual work. The radial displacements of annular disk at the steady state where the disk is rotating at a constant angular velocity are determined by non-linear static equations formulated with 1-dimensional finite elements in radial direction. The linearlized equations of the in-plane vibrations at the disturbed state are also formulated with 1-dimensional finite elements in radial direction along the number of nodal diameters. They are expressed as in functions of the radial displacements at the steady state and the disturbed displacements about the steady state. In-plane static deformation modes of an annular disk are used as the displacement functions for the interpolation functions of the 1-dimensional finite elements. The natural vibrations of an annular disk with different boundary conditions are analyzed by using the presented model and the 3-dimensional finite element model to verify accuracy of the presented equations of motion. Its results are compared and discussed.
송승관(Seung Kwan Song),박진배(Jin Bae Park) 대한전기학회 2011 전기학회논문지 Vol.60 No.12
This paper describes the development of an wave energy convertor. We devise a new type of the wave energy convertor which generates electricity by means of under-water pressure oscillation. This wave energy convertor is installed on the seabed floor. That is, there is no exposed body on the surface of the sea. The wave energy convertor comprises an activated assembly which is adapted to be displaced in response to water pressure oscillation to vary the volume of bellows cavity and a power take off assembly which generates electricity in response to movement of the activated assembly.
송승관(Seung Gwan Song),김태용(Tae Yong Kim),곽기열(Gi Yeol Gwak),김중경(Joong Kyoung Kim),김종순(Jong Soon Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Radiators are used in order to prevent temperature rise of the transformer core and windings. This study has performed to analyze Radiator Support Structure about dead and seismic loading condition. At the connection area between radiator flange part and Tank flange Part, the shear, tension and von-mises stress in the connected bolt shall not exceed allowable stress. This paper shows that the structural strength has been improved by applying the reinforcement band on the radiator.