• 기술사
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• 제34권2호
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• pp.62-67
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• 2001

The grave Fengsui is a systematic life science, explained by the life energy of Yin-yang and Its five elements. The life energy of Yin-yang and its five elements, though Invisible and thus difficult to apply, Is easily conceived of as the magnetic force. When the life energy of the grave Fengsui is not understood as ambiguous moving force but as magnetic force, It is possible to open up a new field of Fengsui life culture.

• 조명전기설비학회논문지
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• 제18권1호
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• pp.137-145
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• 2004

본 논문은 평행식 스테레오 영상감시 시스템을 이용하여 3차원 공간에서 다중 이동물체를 검출하고, 카메라에서 이동 물체까지의 거리를 측정하는 알고리즘을 제안하였다. 스테레오 영상감시 시스템의 좌, 우측 영상을 입력을 받아 적응형 임계값과 화소귀납 알고리즘(PRA, pixel recursive algorithm)을 사용하여 다중 이동물체 영역을 추출하였다. 그리고 각각의 물체영역을 윈도우 마스크로 검출하고, 다중 이동물체 각각의 위치좌표와 스테레오 시차를 구하였다. 이 시차와 스테레오 비전 시스템의 특성 및 삼각 함수를 이용하여 다중 이동물체의 거리를 측정하였다. 실험결과 거리측정 오차도 7.28％이내에 존재하였으며, 따라서 제안한 알고리즘을 이용하여 시스템을 구현할 경우 스테레오 방범 시스템, 자율 이동로봇 및 스테레오 원격제어 시스템 등에 응용될 수 있을 것이다.

• Structural Engineering and Mechanics
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• 제52권1호
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• pp.173-203
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• 2014

The cross-section warping due to the passage of high-speed trains can be a relevant issue to consider in the dynamic analysis of bridges due to (i) the usual layout of railway systems, resulting in eccentric moving loads; and (ii) the use of cross-sections prone to warping deformations. A thin-walled beam formulation for the dynamic analysis of bridges including the cross section warping is presented in this paper. Towards a numerical implementation of the beam formulation, a finite element with seven degrees of freedom is proposed. In order to easily consider the compatibility between elements, and since the coupling between flexural and torsional effects occurs in non-symmetric cross-sections due to dynamic effects, a single axis is considered for the element. The coupled flexural-torsional free vibration of thin-walled beams is analysed through the presented beam model, comparing the results with analytical solutions presented in the literature. The dynamic analysis due to an eccentric moving load, which results in a coupled flexural-torsional vibration, is considered in the literature by analytical solutions, being therefore of a limited applicability in practice engineering. In this paper, the dynamic response due to an eccentric moving load is obtained from the proposed finite element beam model that includes warping by a modal analysis.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 봄 학술발표회 논문집
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• pp.381-388
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• 2004

We propose a 2D 'crack' element for the simulation of propagating crack with minimal remeshing. A regular finite element containing the crack tip is replaced with this novel crack element, while the elements which the crack has passed are split into two transition elements. Singular elements can easily be implemented into this crack element to represent the crack-tip singularity without enrichment. Both crack element and transition element proposed in our formulation are mapped from corresponding master elements which are commonly built using the moving least-square (MLS) approximation only in the natural coordinate. In numerical examples, the accuracy of stress intensity factor K/sub I/ is demonstrated and the crack propagation in a plate is simulated.

• 한국실내디자인학회논문집
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• 제37호
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• pp.144-150
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• 2003

Human being is experiencing the spaces with constant moves. The process of delivering information is worked by vision and perception communications. The aim of this specialized study is to analyze the processes of constructed experiences which visitors may choose the directions in the museum. Abstracting and investigating the recognizable and visual elements, we examine how those elements influence the audiences moving choices which reflect the propensity of people through mostly the experimental research. These cases would show the more effective results with proper harmony of different characters. To analyzing and adapt the recognizable and visual elements which effect the audiences moves from starting point, this research suggests the directions of plans in active spaces which would help the communication between the objects In the museums and people. This research is the basic study of maximizing the communication between audiences and exhibitions.

• 디자인학연구
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• 제18권4호
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• pp.139-146
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• 2005

지금까지의 애니메이션 작업은 애니메이터의 객관적 감성과 경험에 의해 이루어져 왔다. 소프트웨어 디자인에 있었어도 지성적인 데이터들을 바탕으로 제작되어져 왔다. 이는 객관화하기 용이한 자료로서 데이터화하기가 쉬웠기 때문 일 것으로 보인다. 이와는 반대로 인간의 감성은 객관화하고 디지털화하기 어려운 요소들이 많이 존재한다. 본 연구는 디지털화하기 어려운 인간의 감성적 데이터를 객관화하고 이를 정량적 데이터로 활용할 수 있는 방법에 대한 부분으로 나는(flying) 궤적(path)을 연구 대상으로 하였다. 실험에 있어 인간이 나는 제적에 대해 어떻게 표현하는지에 대한 감성어를 수집하였다. 수집한 감성어를 통해 감성 평가어를 추출하고 추출한 감성 평가어에서 느껴지는 나는 궤적에 대한 스케치 이미지를 수집하였다. 수집한 스케치 이미지를 기초로 본 연구의 핵심이 되는 실험 동영상 샘플을 제작하였다. 다음으로 나는 궤적을 나타내는 감성어에 대한 물리적 요소와 동영상 샘플과의 상관관계를 분석하기 위해 수량화이론III류와 수량화이론I류를 각각 이용하였다. 그 결과 감성어와 동영상 샘플과의 구조를 파악 할 수 있었고, 나는 궤적에 대한 감성반응의 물리적 자극요소 또한 분석 할 수 있었다. 나는 궤적은 오브젝트(object)가 지나간 경로(path)에 해당한다. 이러한 경로(궤적)를 보고 감성자극 요소들이 복합적으로 작용하여 독특한 감성어로 표현되어 지는 것으로 보인다. 여기엔 감성을 자극하는 요소들이 존재하는데, 그 요소로는 속도, 회전, 규칙 그리고 호의 길이가 그 물리적 요소인 것으로 파악되었다. 본 연구를 통해 나는 궤적의 애니메이션을 표현하는데 있어 애니메이터들의 주관적인 감성 표현들을 객관화, 정량화 시키고자 하였으며, 본 연구의 데이터는 감성 애니메이션 시스템 설계에 있어 기본 데이터로 적용되는 것을 목표로 하고 있다.

• Interaction and multiscale mechanics
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• 제4권4호
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• pp.273-289
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• 2011

The vibration response of the bridges under the moving vehicular load is of importance for engineers to estimate the serviceability of existing bridges and to design new bridges. This paper deals with the three dimensional vibration analysis of prestressed concrete bridges under moving vehicles. The prestressed bridges are modeled by four-node isoparametric flat shell elements with the transverse shearing deformation taken into account. The usual five degrees-of-freedom (DOFs) per node of the element are appended with a drilling DOF to accommodate the transformation of the local stiffness and mass matrices to the global coordinates. The vehicle is modeled as a single or two-DOF system. A single-span prestressed Tee beam and two-span prestressed box-girder bridge are studied as the two numerical examples. The effects of prestress forces on the natural frequencies and dynamic responses of the bridges are investigated.

• Coupled systems mechanics
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• 제9권4호
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• pp.311-323
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• 2020

This paper deals with the effect of the mode shapes on the dynamic response of a multi-storey frame subjected to moving train loads which are modelled as loads of constant intervals with constant velocity using the finite element method. The multi-storey frame is modelled as a number of Bernoulli-Euler beam elements. First, the first few modes of the multi-storey frame are determined. Then, the effects of force span length to beam length ratio and velocity on dynamic magnification factor (DMF) are evaluated via 3D velocity-force span length to beam length ratio-DMF graphics and its 2D projections. By using 3D and 2D graphics, the directions of critical speeds that force the structure under resonance conditions are determined. Last, the mode shapes related to these directions are determined by the time history and frequency response graphs. This study has been limited by the vibration of the frame in the vertical direction.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1891-1895
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• 2008

Water covers 70% of the earth's surface and the human body consist of 75% of it. It is clear that water is one of the prime elements responsible for life on earth. Over the last 30 years or so, numerous studies have attempted to find out more about the water microscopically. In this paper, we investigated how the receding and advancing contact angle of the moving water droplet changes on a solid surface having various LJ epsilon parameters. To observe the dynamic contact angle history, a body force applied to all water molecules after obtained the water droplet in equilibrium with the solid surface. We obtained the density profile and receding and advancing contact angle of the moving water droplet

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권1호
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• pp.8-15
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• 2004

In order to scheme the optimal assumption that satisfies the travel demand, it should be review the elements that affect on determining the headway, which are signal systems, line shape, vehicle(Light Rail Transit) performance, and so on. When applying the conventional signal systems, including Fixed Block System and Moving Block System, It was confirmed whether or not satisfy the requirements of target line with the way of a numerical formula reviewing and Train performance Simulation on the main line, station, depot, and so forth. Therefore, it should be used as references that decide target line and each sub-system after identifying the compliances for Minimum Headway to Moving Block System.