• Transactions of Materials Processing
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• v.4 no.1
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• pp.17-27
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• 1995

The tact switch is widely used in electric and electronic products. The dome type tact spring is produced by stamping. Stamping of the tact spring and operation of the tact switch have been simulated by the elasto-plastic finite element method. The operating characteristics of the switch may be given by the relation between the operating force and stroke. For a given material, this is affected by two main factors. One is the geometry of dome spring which is determined by the geometry of stamping dies and the stamping pressure, and another one is the dimension of switch. From the calculation, it was possible to obtain the stamping conditions and switch dimension for a predetermined force-stroki relation And, the hoop stresses and effective strains distributions due to the stamping and during the operation of the switch indicate a possibility of cracking in the center and rim of dome spring.

• Journal of Power System Engineering
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• v.15 no.5
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• pp.30-36
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• 2011

본 논문은 근수축을 이용한 근육 작용의 운동학을 다룬다. 첫째, 근육 해부학이 미시적 관점의 운동학에 대하여 검토되었으며, 다음으로 거시적 관점의 근육 운동학이 작동 이론을 설명하기 위해 공식화 되었다. 그리고 작동 모델을 평가하기 위해 시뮬레이션 결과가 제시된다. 본 연구는 마이크로미터 거리에 따라 생물학적 분자 운동이 어떻게 거시적 운동으로 바뀌는지를 설명하고 있다. 마지막으로 근육 모델이 거시적/미시적 작동용으로 여러 가지 역학의 형태로 이용될 수 있다는 것을 보인다.

• Journal of the Korean Society for Nondestructive Testing
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• v.27 no.4
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• pp.345-353
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• 2007

We have obtained a topographical image nondestructively for a Cu thin film in liquid using a near-field scanning microwave microscope (NSMM), its operating frequency was 3.5 to 5.5 GHz. We have kept a distance of 10 nm between tip and sample using a quartz tuning fork shear force feedback system. As an end of tip was attached to one prong of the quartz tuning fork has a length of 2 mm, the only tip of tuning fork was immersed in water tank. A loss cause by evaporation in water tank is regulated with actuator was connected to a supplementary tank. Moreover, using a revise program of LabView, we could increase the accuracy of a measurement in liquid.