• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2005.05a
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• pp.401-406
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• 2005

According to the ubiquitous times that is new important topic, the miniature is demanded in the industry at large. The high accuracy and accumulation make the assembly equipment and the production equipment huge from the size of view. The huge equipment brings about the expensive price of the equipment, a low flexibleness and a low productivity. It makes the manufacturing equipment huge that the accuracy only depends on the mechanism stiffness. The position of two assembled parts is transformed with the global coordinate system whose datum is machine coordinate system. The purpose of this research is invention of the module that can adjust one part to the order part automatically. The module that has a function of self adjustment only takes a stiffness in assemble direction and can be moved freely in the other direction so this function makes a self adjustment. The self adjustment module reduces the tact time and also diminishes the inferior goods and makes reconfigurable machine in $\mu-part$ assembly.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.35-38
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• 2014

디지털 문화재 콘텐츠는 현실에서 체험하기 힘든 문화재를 디지털 기술의 특성을 이용하여 사용자의 경험을 극대화할 수 있고, 문화재 보수, 교육 등에 활용될 수 있다. 그런데 기존의 디지털 건축물 문화재는 실재 문화재의 구조 및 구성을 무시하고 외형만 만들어져 있어서 다양한 형태로 바꾸어 활용하기 곤란하며, 디지털 건축물 문화재 자체가 가상공간에 존재하여 현실체험에 제한을 받고 있다. 본 논문은 사용자가 현실공간에서 부재 미니어처를 이용하여 미니어처 문화재를 조립하고 그 결과를 가상공간의 디지털 문화재로 연결하여 다양한 체험을 제공하는 시스템에 관한 것이다. 이로서 현실 체험과 가상 체험이 연결되어, 보다 효과적인 체험이 가능하고 건축 문화재에 대한 보다 전문적인 학습이 가능하게 된다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1999.05a
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• pp.197-205
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• 1999

소형 히트파이프에서 ？을 구리망사 또는 그루브를 적용할 수 있고 그루브 형상은 U, V 등 다양하다. 망사？은 모세압이 큰 잇점이 있어나 제작 단가가 높다. 그루브？은 대량생산이 용이하나 전밀 가공 기술이 요구된다. 현재까지 국내에서는 노트북 PC의 CPU 냉각에 사용한 소형 히트파이프의 전량을 해외에서 구매하고 있다. 본 연구에서는 직경 7 mm U형 그루브 관을 인발하여 관직경을 축소한 결과 내경 3.6 mm의 외경 4mm 의 V형 그루브관을 얻을 수 있었다. 이 관을 이용하여 소형 히트파이프를 제작하고 열전달 성능 시험을 수행하였다. 열전달 한계는 40~6$0^{\circ}C$ 범위작동온도 경사각 0$^{\circ}$ 에서 3 W를 얻을 수 있었다. U형 그루브 히트파이프에 비하여 모세압 저하로 인하여 낮은 값을 나타내었다. 열저항을 약 0.7~l.3 $^{\circ}C$/W 로 U형 그루브와 유사하였다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.192-193
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• 2000

공간 광변조기(spatial light modulator)는 빛의 진폭, 위상 혹은 편광 상태를 공간적으로 변조하는 소자이다. 2차원적인 화소 배열을 갖는 공간 광 변조기는, 전자 소자들이 지니지 않는, 정보를 고속으로 병렬 처리할 수 있는 기능에 힘입어, 광상관기, 광컴퓨터, 프로젝션 TV, 빔 프로젝트, 홀로그래피 메모리의 핵심 소자로 지난 50년간 활발히 연구되어, 액정 공간 광 변조기, 자기 광학 공간 광 변조기$^{(1)(2)}$ 등이 개발되었다. 이 중에서 자기광학 공간 괌 변조기는 화소의 스위칭 스피드가 빠르고, 견고하고, 내방사능성을 가질 뿐만 아니라, 비휘발성이라는 장점을 가지고 있어, 주로 우주항공용의 Miniature Ruggedized Optical Correlator(MROC)$^{(3)}$ 에 사용되어 왔다. 본 논문에서는 새로운 개념의 공간 광 변조기인 자성 포토닉 결정을 이용한 자기 광학 공간 광 변조기(MPC-MOSLM)의 제조에 관하여 논하고자 한다 (중략)

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.23 no.11
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• pp.996-1002
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• 2013

Conditions of stiffness for a steel spring torsional vibration damper are difficult and ambiguous. Nevertheless correct estimation of stiffness is essential and important in the damper design for the damper to activate properly in the field. In this paper, to build up the estimation method of steel spring torsional vibration damper a miniaturized model was developed for modelling between a spring and inner star of the damper. The method obtained from the results through the experiment and analysis of it was applied to the prototype torsional damper.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.791-798
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• 2001

As the form factor of the disk drive is decreased, many mechanical issues that are negligible in larger form factors, should be considered for the design of the miniature drives. This paper deals with basic research on vibration characteristics and design considerations of small disks and actuators. The natural frequencies of micro-sized disks with polycabonate and glass substrates are experimentally measured, being compared to FEM results. In order to investigate the effects of rotating speeds, airflow and disk size on power consumption. we measure power imposed to spindle motor when different optical disks are spins in vacuum chamber. Finally, The vibration characteristics of the micro actuator used in a IBM Microdrive are experimentally studied for the application to the basic design of micro optical disks.

• Bulletin of the Korean Chemical Society
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• v.15 no.1
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• pp.23-25
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• 1994

A simple analytical method that allows direct monitoring of small amount of CO$_2$ in a CO$_2$ discharge tube which utilizes the optoacoustic detection technique is described. The dependence of the optoacoustic signal on the mole fraction of CO$_2$ was shown that the system responded linearly to the amount of CO$_2$ present in the miniature discharge cavity equipped with Cu electrodes. It was also found that fraction of dissociated CO$_2$ varied from 14 to 37% of the initial concentration which depended on the current and the pressure in the tube. This simple and easy detection method has proven to possess the practical advantages over the conventional systems for the study of CO$_2$ laser electrodes.

• The Journal of Korea Robotics Society
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• v.16 no.2
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• pp.79-85
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• 2021

Soft fluidic actuators (SFAs) are widely utilized in various areas such as wearable systems due to the inherent compliance which allows safe and flexible interaction. However, SFA-driven systems generally require a large pump, multiple valves and tubes, which hinders to develop a miniaturized system with small range of motion. Thus, a highly integrated soft actuator needs to be developed for implementing a compact SFA-driven system. In this study, we propose an electro-hydraulic soft zipping actuator that can be used as a miniature pump. This actuator exerts tactile force as a dielectric liquid contained inside the actuator pressurized its deformable part. In addition, the proposed actuator can estimate the internal dielectric liquid thickness by using its self-sensing function. Besides, the electrical characteristics and driving performance of the proposed system were verified through experiments.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.9
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• pp.94-103
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• 1996

This paper is concerned with the theroretical and experimental study on the force control of a miniature robotic finger that grasps an object at three other positions with the fingertip. The artificial finger is uniform flexible cantilever beam equipped with a distributed set of compact grasping force secnsors. Control action is applied by a qiexoceramic bimorph strip placed at the base of the finger. The mathematical model of the assembled electro-mechanical system is developed. The distributed sensors are described by a set of concentrated mass-spring system. The formulated equations of motion are then applied to a control problem which the finger is commanded to grasp an object The PID-controller is introduced to drive the finger. The usefulness of the proposed control technique is verified by simulation and experiment.

• The Bulletin of The Korean Astronomical Society
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• v.44 no.2
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• pp.46.3-46.3
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• 2019

We present the control software and its development process for a prototype of the Camera and Grating Articulation System (CGAS) for GMACS, a wide-field, multi-object, moderate-resolution optical spectrograph for the Giant Magellan Telescope (GMT). The CGAS prototype is currently designed for the camera articulation controller as a miniature model of the GMACS. The camera articulation package (CAP) is a software that controls two stepper motors to adjust the camera angle. The package is developed using Visual C++ and runs on Windows 10. We discuss the architectural design and communication route between the high-end user software and the electronics hardware.