• 한국기계가공학회지
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• 제7권2호
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• pp.60-65
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• 2008

The high-technology industries including a semi-conductor and an information communication need an ultra-precision technology from the technological points of view. Nano technology based on an ultra-precision technology is being studied to overcome the delicate technology that may occur in the semi-conductor fields. Then, the transferring equipment with high resolution and long displacement becomes an important technology. The goal of this study is to analyze the displacement magnification mechanism driven by piezoelectric actuator which has high resolution and fast response characteristics using flexure hinge with the merits of soft displacement, negligible back-lash and stick-slip, and no-lubrication. The analyses to reduce the magnification losses occurred during the magnification process are performed using ANSYS software based on FEM. The five design variables such as arm thickness, thickness of hinge, radius of hinge, length of input side at the 1st lever and magnification ratio of 1st lever are optimized to induce the maximum magnification ratio using Taguchi method.

• 한국기계가공학회지
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• 제12권1호
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• pp.97-103
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• 2013

A new precision positioning mechanism for stage was been developed by Displacement Magnification Device(DMD) in this paper. The DMD was composed of the beam and multilayer piezoelectric actuators. The theoretical and experimental analysis of DMD to enlarge displacement more then 50times were discussed. And the 2-axis stage by using displacement amplification apparatus was added in the new DMD, and it was able to do it through finite element analysis and experiment. As the results, the magnification of DMD can be obtained about $100{mu}m$ displacement to the 10V input voltage($1.5{mu}m$). And the about 50nm of linearity error in the $30{mu}m$ measurement range and 20times of the amplification in displacement can be measured. In addition, the experimental results are confirmed the possibility of millimeter displacement characteristics and correspond to finite element analysis results.

• 한국정보통신학회논문지
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• 제12권12호
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• pp.2271-2276
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• 2008

본 논문에서는 3D 영상의 해상도 개선을 위한 크기가변 확대 기법 기반의 컴퓨터적 집적 영상 재생 방법을 제안한다. 먼저 컴퓨터적 집적 영상 재생 방법에서 요소 영상 사이의 간섭 문제를 설명한다. 큰 확대개수는 요소 영상의 확대 중첩 과정에서 큰 간섭을 야기하여 재생 3D 영상의 해상도를 저하시킨다. 이 간섭 문제를 극복하기 위해서 최소 확대 계수를 계산하는 방법을 제안한다. 새로운 최소 확대 계수는 해상도가 향상된 3D 영상을 제공하며, 제안하는 방법은 기존의 방법보다 계산량이 작다. 제안하는 방법의 유용함을 보이기 위해서 컴퓨터 복원 실험을 수행하고 그 결과를 보고한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.1169-1170
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• 2013

• 한국광학회지
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• 제29권1호
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• pp.19-27
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• 2018

일반적으로 광학계의 물체거리가 변하면 배율이 변하게 된다. 본 논문에서는 일반적인 이중 가우스(double-Gauss) 형태의 광학계에서 조리개를 기준으로 조리개 앞쪽에 위치한 렌즈군과 조리개 뒷쪽 렌즈군을 광축 방향으로 독립적으로 평행하게 이동하여 물체거리에 따라 배율과 상면이 고정되는 광학계를 제안하고 설계하였다. 이러한 광학계는 전방시현장치(head-up display, HUD), 두부장착디스플레이(head-mounted display, HMD) 등의 투사 광학계에 물체거리의 변화에 따라 상 크기가 변화하지 않도록 하여 전방시현장치 또는 두부장착디스플레이에서 초점 조절(focusing) 시에 화각이 변하지 않도록 하였다. 또한 반도체 칩과 IC 회로기판을 연결하는 와이어(wire)의 상태를 검사하는 과정에서 검사장비가 위 아래로 움직여서 물체거리가 변해도 광학계의 배율이 변하지 않도록 하여 고속검사가 가능할 수 있도록 별도 영상 처리를 시스템적으로 생략할 수 있었다. 본 논문에서 가우스 괄호법(Gaussian bracket method)을 이용하여 원하는 사양을 만족하도록 각 군의 이동량을 구해서 배율과 상면이 고정되도록 하였다. 초기 설계를 진행한 후, 최적화는 광학 설계 프로그램인 시놉시스(Synopsys)를 사용하였다.

• 한국멀티미디어학회논문지
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• 제24권7호
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• pp.903-912
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• 2021

Eye tracking research for upper limb disabilities is showing an effect in the aspect of device control. However, the reality is that it is not enough to perform web interaction with only eye tracking technology. In the Eye-Voice interface, a previous study, in order to solve the problem that the existing gaze tracking interfaces cause a malfunction of pointer execution, a gaze tracking interface supplemented with a voice command was proposed. In addition, the reduction of the malfunction rate of the pointer was confirmed through a comparison experiment with the existing interface. In this process, the difficulty of pointing due to the small size of the execution object in the web environment was identified as another important problem of malfunction. In this study, we propose an auto-magnification interface of objects so that people with upper extremities can freely click web contents by improving the problem that it was difficult to point and execute due to the high density of execution objects and their arrangements in web pages.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 춘계학술발표회논문집
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• pp.239-243
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• 2004

It does not exist almost that Most satellite image has both high spectral and spatial resolution. In order to apply the satellite image for to be actual, we need numerical and analytical technique development to improve the resolution. Specially in the function of solid illustration, we represent the solid image through the image generation to solid screen. The main function includes magnification, reduction, screen center movement, Panning, territory magnification. The method to process the image includes histogram and contrast modulation. Afterwards, we will develop the function includes 3-dimension cursor to control the elevation position and calculate the ground coordination automatically. There is the layer control includes the representation and the edition of 3D vector, extraction the Z value by On the Ground and digital elevation.

• 조명전기설비학회논문지
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• 제25권4호
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• pp.57-64
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• 2011

Most of the user has been used linear load and non-linear load. The former is usually inductive load which is needed power factor compensation, the latter is power conversion system device. Actually two kinds of load is used together in the customer application. Generally capacitor is used for power-factor compensation of inductive load and reduction harmonics of non linear load with reactor. Non-linear load generates harmonic current for its energy conversion process. If harmonic current pass along the low impedance side of distribution system, the magnification of voltage and current is appeared by the series and parallel resonance. As a result, condenser has received a bitter electrical stress by the harmonic component. In this paper, we analyzed that how resonance is changed by the 5-th harmonic current pattern and proposed an alternative plan for non-magnification.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.1046-1050
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• 2005

Micro Cellular Plastics create a sensation at polymer industrial for lowering product cost & overcoming a lowering of mechanical intensity. There Is much development from injection molding pans but Extrusion parts is slow. This research is MCPs Extrusion parts, It is basis experiment for Process to make beads that is basis raw material of Package used most by shock mitigative of industry.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2005년도 춘계학술대회 논문집
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• pp.115-124
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• 2005

This paper analyzes the problems that occurred in the magnification process for a fine input image and investigates a method to improve the problems. This paper applies a curve interpolation algorithm in CAD/CAM for the same test images with the existing image algorithm in order to improve the problems. As a result. the nearest neighbor interpolation. which is the most frequently applied algorithm for the existing image interpolation algorithm. shows that the identification of a magnified image is not possible. Therefore. this study examines an interpolation of gray-level data by applying a low-pass spatial filter and verifies that a bilinear interpolation presents a lack of property that accentuates the boundary of the image where the image is largely changed. The periodic B-spline interpolation algorithm used for curve interpolation in CAD/CAM can remove the blurring but shows a problem of obscuration, and the Ferguson's curve interpolation algorithm shows a more sharpened image than that of the periodic B-spline algorithm. For the future study, hereafter. this study will develop an interpolation algorithm that has an excel lent improvement for the boundary of the image and continuous and flexible property by using the NURBS. Ferguson's complex surface. and Bezier surface used in CAD/CAM engineering based on. the results of this study.