• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.38 no.4
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• pp.307-316
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• 2002

In order to evaluate the deformation and stiffness of frame structure for fishery, composed of unit platforms which made of two concentric high density polyethylene buoys fixed by clamps and belts and rubber hinge components, under wave, the structural analysis for the square type of the structure was carried out by using finite element methods. The accurate physical properties of rubber hinge components determined by material tests were an important parameter to evaluate more reliable structural stability for the structure. The idealization to beam element with equivalent stiffness and rubber element with linearity for rubber hinges was necessary for the modeling of rubber component which has hyper-elastic characteristics. In addition, it was shown that the structural response of the structure under wave was larger in the hogging condition than that of in the still water or in the sagging condition.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.73-74
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• 2000

어업용 프레임 구조물 중 부유식의 것은 수면에 떠 있는 프레임과 그 하부에 있는 그물이 조류와 파랑에 의한 저항을 동시에 받고, 낙망 등과 같은 수중 침하식의 것은 그 전체가 조류에 의한 저항을 많이 받기 때문에, 이들 구조물의 안전성은 그들이 받는 저항의 크기에 따라 크게 달라진다. (중략)

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.31-32
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• 2006

본 논문은 중형엔진 조립과정에서 실린더 프레임 회전 작업에 사용하는 지그의 구조해석을 수행한 후, 지그의 안전성을 검토하고 지그의 경량화를 통하여 실용적인 지그 설계안을 제안하였다. 현장 작업자가 들 수 있는 최대 무게를 넘는 지그를 구조해석 모델로 선정한 후, 해석모델은 지그, 실린더 프레임, 볼트, 너트, 샤클 핀을 3차원 입체요소로 구성하고 ABAQUS/Standard를 사용하여 재료 비선형 및 접촉을 고려한 구조해석을 수행하였다. 구조최적화를 위하여 응력이 상대적으로 낮은 부위와 작업성을 고려하여 설계변수를 선정하고, 실험계획법의 직교배열표를 활용하여 설계변수에 대한 각 부위의 민감도와 경량화 모델을 도출하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.29 no.1
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• pp.1-8
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• 2016

In this paper, we perform structural analysis for a base frame which is used to support a motor for large centrifugal compressor drives and a safety assessment according to the concrete placement. First, the structural analysis about four loading conditions for the motor base frame was conducted and the structural safety was evaluated through both the maximum distortion energy theory and Mohr-Coulomb theory. It was possible to perform a more reasonable safety evaluation against local stresses occurring at the discontinuous portion of the fragile structural members by applying the safety assessment through ASME VIII Div. 2. In addition, the motor base frames with and without the internal concrete placement were quantitatively compared by the structural analysis and safety evaluation using ASME code and it was found to improve the structural integrity due to the concrete placement.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.20 no.5
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• pp.573-580
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• 2007

This paper presents the numerical estimation of the fatigue life for the frame box's welded parts of the marine vessel engine S60MC-C. The time-variations of the effective stresses at the critical points during a piston cycle are computed through the finite element analysis, by applying the dynamic loadings that were analytically derived in the previous paper. The fatigue lives of the welded parts are estimated by making use of the hot-spot stress extrapolation and the Palmgren-miner cumulative damage rule.

• Proceedings of the KAIS Fall Conference
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• 2001.11a
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• pp.85-90
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• 2001

This study is object to structural analysis of household running machine frame. The finite element model was developed to compute the stress, strain and natural frequency for household running machine frame. For structural analysis using result from FEM Code. In other to structural analysis of household running machine frame, many variables such as load condition, boundary condition and weight condition are considered.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.4
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• pp.531-538
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• 2006

Grating is an installed structure on the road for drain. This paper proposes a new product which can prevent the accumulation of earth and sand through the improvement of Grating structure. There were usually harmful insects and bad smell because of accumulated garbage in the frame of previous product. The product had a reverse-flowing sewage due to the bad draining in case of rain. The whole thing of the existing Grating installed with the one set of frame and main body should be changed when it was damaged. This study is to develop a structure which can separate grating main body from frame and grating main body can equip and separate after fixing frame to the manhole with cement. also install jig for the loss prevention and change for the better.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1086-1088
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• 2010

본 연구는 지하 구조물의 내벽에서 발생하는 습윤(濕潤) 및 결로를 방지하는 내벽체에 관한 것으로, 사방으로 연결조립 가능한 벽체판넬의 한쪽을 수직 지지프레임에 끼움 조립한 상태에서 타카핀으로 벽체판넬 및 수직 지지프레임을 동시 관통하여 내벽에 고정한 후 상기 수직프레임에 다른 벽체판넬의 일측을 중첩되게 조립하는 방법으로 지하 구조물에 내벽체를 편리하게 시공할 뿐만 아니라 공기를 단축하며, 상기 내벽체의 구성부품이 매우 간소하면서 가격이 저렴하여 공사비를 대폭 절감할 수 있는 시공이 편리한 지하 구조물용 내벽체의 개발에 관한 것이다.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.81-84
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• 2004

패킷망을 통한 음성 통신이 발달됨에 따라 패킷 스위칭 채널 환경에서 계층적 구조를 가지는 광대역 음성 부호화기의 개발에 대한 요구가 늘어나고 있다. 본 논문에서는 이러한 차세대 패킷 전화용 광대역 음성 부호화기의 상위 대역에 대해서 효율적인 양자화 방법을 제안한다. 먼저 전체 프레임을 다수의 짧은 부프레임으로 구분하고, 각각의 부프레임에 MLT(Modulated Lapped Transform)변환을 적용하여 주파수 영역으로 변환하여 2차원 구조의 데이터 행렬을 생성한다. 이러한 2차원 구조의 데이터를 크기와 부호로 분리하고, 크기는 2차원 DCT를 사용하여 시간과 주파수 영역에서의 신호 압축을 동시에 얻을 수 있게 하였다. 이와 같은 새로운 구조를 활용하여 기존의 방법보다 Energy Compaction 효과를 높이고 양자화 성능을 향상시킬 수 있었다. 또한 Core Layer의 부호화된 파라미터를 상위 대역의 양자화에 이용함으로써 그 성능을 향상시킬 수 있는 방법을 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.7
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• pp.3142-3150
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• 2013

Present research deals with an optimal design of the C-type frame of a desktop pressing machine to minimize its deformation which plays an important role in accuracy of the machine. Deformation pattern of the frame is analyzed by the finite element method. Design parameters are defined for the frame to derive an optimal design. Displacement and weight sensitivities of the parameters are analyzed using the method of the parametric study. On the basis of the response curves for the parameters, optimal designs of the frame are proposed. Effectiveness of the optimal design is verified by analyses in the viewpoint of the deformation and weight of the frame. Deformation of the optimized frame without increase of the weight is 87.5 % of the original frame.