• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.167-168
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• 2006

This paper is concerned about the development system that the bead width's size can be controlled. In order to control the bead width, DC motor driving slide on auto carriage is used. The adjustment of bead width is carried by amplitude and weaving shape is controlled by MCU(Micro Controller Unit). We confirmed the result by tracking experiments.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.9
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• pp.75-80
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• 2000

Although laser interferometer is widely accepted as a tool for measurement of motion accuracy the set-up procedure is time-consuming because of the strict requirement on alignment between laser head and optic units. This paper presents a 4-axis auto-aligning system which is useful for easy set-up of laser interferometer so as to evaluate precision of a 2-axis feeding system. This paper proposes two ideas for alignment in laser interferometer set-up: one is use of mirror and retroreflectors. and the other is taking advantage of the pre-defined movement and peculiar characteristic of retroreflecotrs. The pros and cons of the two methods are discussed. Illustrative experimental results are presented in which the developed system is applied to a XY table.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.946-947
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• 2015

정지궤도 복합위성용 전력조절장치는 위성의 전력버스에 필요한 전력을 조절하고 배터리의 충전과 방전을 제어하고 관리한다. 전력조절장치의 용량은 1kw로 하고 태양 전지의 어레이는 4개의 패널로 구성되며 S3R(Sequential Switching Shunt Regulator)을 이용하여 조절된 버스전압은 완전조절 50Vdc으로 한다. 변환된 전력은 위성부하에 필요한 전력을 분배하는 PDM(Power Distribution Module)에 공급된다. 남은 전력은 BCR(Battery Charge Regulator)를 통해 배터리에 전력을 충전하고 전력이 부족할 때 BDR(Battery Discharge Regulator)를 통해 방전을 하여 버스전압에 전력을 공급한다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.94-94
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• 2011

LCD, PDP, OLED 등으로 대표되는 FPD 장치의 투명전극으로 사용되는 ITO의 전기 광학적 특성을 연구하였다. 향후 발전시켜나갈 Flexible display 에서는 ITO를 저온에서 증착해야 할 필요성이 대두되었고, 이에 따라 기판의 온도를 상온으로 유지하면서 고품질의 ITO 박막을 제조하고자 하는 연구가 진행되고 있다. 본 연구에서는 상온 조건에서 유리 기판 위에 RF Magnetron Sputtering 장치를 이용하여 ITO 박막을 증착하였으며 다양한 Magnetic구조를 통한 자장의 분포를 제어하였다. Magnetic을 이용시 RT에서 얻은 면저항보다 낮은 면저항을 가질 수 있을 뿐만 아니라 온도 증가($250^{\circ}C$)에 따른 결과와 비교시 차이가 거의 없음을 알 수 있었다.

• Journal of Auto-vehicle Safety Association
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• v.13 no.3
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• pp.6-12
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• 2021

This paper presents a lateral stability control for rear wheel drive (RWD) vehicles using electronic limited slip differentials (eLSD). The proposed eLSD controller is designed to increase the understeer characteristic by transferring torque from the outside to inside wheel. The proposed algorithm is devised to improve the lateral responses at the steady state and transient cornering. In the steady state response, the proposed algorithm can extend the region of linear cornering response and can increase the maximum limit of available lateral acceleration. In the transient response, the proposed controller can reduce the yaw rate overshoot by increasing the understeer characteristic. The proposed algorithm has been investigated via computer simulations. In the simulation results, the performance of the proposed controller is compared with uncontrolled cases. The simulation results show that the proposed algorithm can improve the vehicle lateral stability and handling performance.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1139-1140
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• 2011

본 논문에서는 사용자의 스마트폰을 개인을 식별하는 인증장치(Handle)로 사용하고 이 장치를 통해 체지방 분석, 건강관리 전문가의 처방기록을 받고 받은 기록을 바탕으로 운동기구들과 Wi-Fi 통신을 통하여 운동량을 측정 및 관리하는 구현을 하였다. 건강관리 전문가의 처방을 통해 사용자의 최적화된 운동량을 체크하여 효율적인 운동을 한다. 본 시스템은 체지방 측정기계와 전문가의 측정 결과를 수치화 하고 운동기구들의 이용 횟수를 데이터베이스에 구축하고 자동 스케줄 관리를 한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.3
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• pp.289-294
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• 2014

Industrial manipulators are usually heavy given the payloads they carry. Therefore, they require high-capacity servomotors and speed reducers, which leads to high costs. However, if manipulator weight could be compensated for using a counterbalance mechanism, the motors' and speed reducers' capacities could be minimized substantially. However, it is usually difficult to assure durability and reliability with the conventional wire-based counterbalance mechanism. Therefore, a more robust gear- and roller-based counterbalance mechanism is proposed in this study. A manipulator was developed using this mechanism; this manipulator maintains its performance even when using motors and reducers of lower capacities. The results of various simulations and experiments verified that the proposed mechanism provides the torque required to compensate for gravitational torque in any configuration and minimizes the torque required for supporting a large payload.

• Journal of the Korean Geophysical Society
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• v.9 no.2
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• pp.77-86
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• 2006

Aplications of the real-time kinematic GPS surveying and inertial measurement unit have been beingRTK GPS allows the use of a static base station and remote rover unit to allow for data collectionwithin several seconds and in real time. It is useful for monitoring the behaviors of massive structureslike bridges. And this study purposed to implement a method of deciding the acurate dynaimc attitudeof structures by IMU. In this study, among GPS methods, we used RTK GPS to analyze the precisionof monitoring and then on the basis of it, we developed a monitoring system using RTK GPS anda deviation betwen observation values, X axis was 1mm, Y axis was 1mm and Z axis 2.2mm. I tturned out that it was possible to monitor and measure structures by RTK GPS and IMU.

• Journal of Korea Multimedia Society
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• v.4 no.4
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• pp.316-323
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• 2001

Gamut mapping is a technique that acts on cross-media color reproduction to transform a color between devices for the purpose of enhancing the appearance or preserving the appearance of an image. Gamut mapping essentially produces color conversion error which depends on the gamut mapping method, source and destination devices, and sample points for gamut modeling. For color space conversion between monitor colors and printer colors, empirical representation using sample measurements is currently widely utilized. Color samples are uniformly selected in the device space such as CMY or RGB, represented as color patches, and then measured. However, in the case of printer, these color samples are not evenly distributed inside the printer gamut and the color conversion error is increased. Accordingly, this paper introduces a equally distributed color sampling method in CIELAB space, a device- independent color space, to reduce color conversion error, and the performance is analyzed via color space conversion experiments using three-dimensional interpolation.

• Composites Research
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• v.12 no.1
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• pp.19-27
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• 1999

A design development test for carbon/epoxy composite laminates for an aircraft flight control system is performed. The design development test includes moisture absorbing test, tensile, compressive, bearing and lap shear tests. The moisture absorbing behavior for different fiber orientation angles is investigated and the changes in mechanical characteristics are compared. In the in-plane tensile test, the effect of damages such as scratches and impacts is studied. The bearing test is performed for different fastening types. The resulting design allowable stress and environmental load enhancement factor are used for the structural analysis and certification tests for the flight control system.