• Proceedings of the Korean Society of Computer Information Conference
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• 2019.01a
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• pp.295-296
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• 2019

본 논문은 항공기내의 주요 항공전기 전자 부분품을 연결하여 주는 배선조립체의 연속성을 시험할 수 있는 점검기의 개발에 관한 것이다. 기존의 항공기 내의 배선조립체의 연속성 시험은 디지털 멀티미터의 저항점검 기능을 통해 이루어지고 있었으나, 측정된 저항값이 정상인지 비정상인지의 판단은 정비사의 경험에 의한 판단에 의존할 수밖에 없는 문제가 있다. 제안한 점검기는 정비사가 예상되는 배선의 AWG 규격 및 길이를 입력하면 배선조립체의 AWG 규격별, 길이별 SPEC'의 저항값을 계산하여 측정된 저항값이 정상인지 비정상인지 확인할 수있는 메시지를 시현하게 하여 정비사의 정비 부담을 줄여줄 수 있다. 또한 본 시스템은 오픈소스를 이용하여 저비용으로 제작가능하게 하여 많은 정비사들이 사용할 수 있도록 하는 장점이 있다.

• Tunnel and Underground Space
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• v.29 no.5
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• pp.318-331
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• 2019

A three-dimensional(3D) equivalent continuum modeling was performed to analyze hydraulic behavior of rock mass considering discontinuities by using DFN model and smeared fracture model. DFN model was generated by FLAC3D and smeared fracture model was applied by using FISH functions, which is built-in functions in FLAC3D, for equivalent continuum model of fractured rock mass. Comparative analysis with 3DEC, which is for discontinuum analysis, was conducted to verify reliability of equivalent continuum analysis by using FLAC3D. Similar results of hydraulic analysis under the same conditions could be achieved. Equivalent continuum analysis of fractured rock mass by using DFN model was implemented to compare with existing analytical methods for inflow into the tunnel.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.527-531
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• 2007

The classical continuum theory-based thin film model is independent of their size and the surface effect can be ignored. But the surface to bulk ratio becomes very large in nano-size structures such as nano film, nano wire and nano beam. In this case, surface effect plays an important role and its contribution of the surface effect must be considered. Molecular dynamics simulation has been a conventional way to analyze these ultra-thin structures but structures in the range between submicro and micro are difficult to analyze by classical molecular dynamics due to the restriction of computing resources and time. Therefore, in present study, the continuum-based method is considered to predict the overall physical and mechanical properties of the structures in nano-scale, especially, for the thin-film. The proposed continuum based-thin plate finite element is efficient and reliable for the prediction of nano-scale film behavior.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.619-624
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• 2000

Longitudinal vibration of an axially moving material is investigated by using the assumed modes method. to circumvent a difficulty in choosing the comparison functions which satisfy the boundary conditions the assumed modes method is adopted by which equations of motion are discretized. Based on the discretized equations, the complex eigenvalue problem is solved and then the effects of the translating velocity on the natural frequencies and modes are analyzed.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.3
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• pp.215-221
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• 2004

Large machine and structure can not be normally treated as lumped parameter system. Such machine or structure must be broken down to individual beams or panels the motion of which must be analysed before an absorber system can be designed for each element. The absorber may be a lumped parameter system or a continuous system. One of the most common elements in a machine or structure is the cantilever, and in this paper is considered the design of a continuous parameter absorber to reduce the transverse vibrations of a beam. So this paper describes the method to obtain the accurate information about combined continuous beam system with DVA. This information is obtained from the combined system's receptance. and this paper shows the convenience and useful informations when design the dynamic vibration absorber with the combined system's receptance.

• Journal of the KSME
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• v.54 no.2
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• pp.35-40
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• 2014

이 글에서는 나노재료의 멀티스케일 해석에 있어서 재료 구성/조성의 불확실성과 해석 모델의 불확실성을 고려하는 통계적 접근의 중요성과 그 방법에 대해 소개하고자 한다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2009.03a
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• pp.91-97
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• 2009

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.05a
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• pp.626-627
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• 2010

• Journal of the Korean Society for Nondestructive Testing
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• v.33 no.1
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• pp.96-101
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• 2013

• Journal of the Korean Society for Nondestructive Testing
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• v.36 no.6
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• pp.510-516
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• 2016