• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.05a
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• pp.333-337
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• 2002

본 연구에서는 구조설계에 관한 관점에서 사무용 의자에 기능을 부여할 수 있는 메커니즘에 대한 분류 및 특성분석에 대해 기술하였으며 분류된 메커니즘 유형의 구성요소에 대해 분석하였다. 분류 기준으로는 메커니즘의 소재, 형태, 기능 등으로 분류하였고 이에 따른 사용자와의 interface측면에서 메커니즘과 직접적인 상관관계가 깊은 레버 및 손잡이의 위치 등에 대한 적합성을 검토하였다. 본 연구를 통하여 사무용 의자 설계 시 물리적인 적합도를 높일 수 있는 요소를 고려하는데 활용될 수 있기를 기대하며 메커니즘의 적용성과 기능의 적합성을 확보할 수 있는 정보로서 활용되기를 기대한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.665-666
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• 2006

In precision laser microfabrication, focusing is essential to acquire good machining precision and uniform machining quality. If it does not perform, laser machining cannot be realized. So, confocal scanning method with high depth resolution is used for focus detection technique. This paper is concerned with a procedure for design, analysis and performance test of an autofocus fine actuating stage, which is composed of flexure-hinge type lever mechanism and piezoelectric actuator. Through series of analytical design, the stage is simplified as a rigid bodies(lever and main body) and springs(flexure hinges). The simplified model was applied to determine the dimension of flexure hinges and lever. After structural analysis confirmed design requirement, an actual stage was made and verified through an experiment on the static and dynamic characteristics(maximum stroke and 1st natural frequency). The fabricated stage was satisfied with the design requirement.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.26 no.2
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• pp.187-194
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• 2016

Parametric study on the lever type dynamic anti-resonance vibration isolator (DAVI) is executed to introduce the system in the path of vibration transmission for the vibratory response attenuation. The effects of inertia and location of the lever on the system performances are investigated using FEA. The effects of other parameters such as ratio of lever lengths, ratio of masses and the location of pivot are studied with analytical approach. According to the results, all the parameters except lever location affect the system response in their own ways. Consequently, the optimal lever type DAVI for translational or rotational system can be efficiently designed by selecting system parameters using the procedure introduced in this study.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.205-206
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• 2012

• Journal of the Korean Society for Precision Engineering
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• v.18 no.3
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• pp.152-157
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• 2001

An ultraprecision rotary motor is developed using inchworm motion of two belts actuated by elongation of piezoelectric elements. A symmetric lever mechanism with flexure hinges is designed to connect belts with piezoelectric elements. The lever mechanism is used not only to amplify the elongation of piezoelectric element but also to minimize the numbers of components and the effort for assembly. By experiment, the rotational angle by one cycle is varied from $0.2{\times}10-4 rad to 9.76{\times}10-4$ rad depending on input signal amplitude. Further, the motor has the capability of getting more precise rotational resolution by enlarging the radius of the rotor.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.10
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• pp.1195-1200
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• 2013

In recent years, variable stiffness actuation has attracted much attention because interaction between a robot and the environment is increasingly required for various robot tasks. Several variable stiffness actuators (VSAs) have been developed; however, they find limited applications owing to their size and weight. For realizing their widespread use, we developed a compact and lightweight mini-VSA. The mini-VSA consists of a control module based on an adjustable moment arm mechanism and a drive module with two motors. By controlling the relative motion of cams in the control module, the position and stiffness can be simultaneously controlled. Experimental results are presented to show its ability to change stiffness.