• 건축역사연구
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• 제27권5호
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• pp.7-16
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• 2018

This study investigated the dimensional plan of Kor Sork temple in Preah Pithu complex, Angkor by civil surveying, 3D scan, measured integer ratio and regularity. According to epitaph and preceding researches, Khmer temples were built based on structural planing with the constant ratio and regularity by using special construct measure scales "Hasta" and "Byama". The study assumed the same unit method was applied in Kor Sork temple and identified the regularity of actual measurement value about the temple. The assumed construct measure scale (Hasta) used for the design of this temple is 413mm. The overall apart arrangement of the temple is different in the East-West direction and the North-South direction. In the East-West direction, the whole scale is 180 hasta, and it is divided into 20 hastas. On the other hands, it was confirmed that the North-South direction is 96 hasta and it was divided four quadrants in 24 hastas. Regarding the detailed design, the regularity according to the constant ratio was confirmed. 7 hasta was used as the basic unit on the first floor and 6 hasta were used as the basic unit on the second floor of the terrace. the basement and the central sanctuary is of 6 hasta and 8 hasta were used as the basic standard.

• International Journal of Aeronautical and Space Sciences
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• 제17권1호
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• pp.101-108
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• 2016

The RCS characteristics of stealth modified three-surface aircraft are analyzed in this paper. Prototype A is built with CATIA software and the three-dimensional digital models of modified stealth three-surface B and C are also designed based on carrier-based aircraft Su-33; the numerical simulation of RCS characteristics of three-surface aircraft is conducted with RCSAnsys software based on physical optics method and the method of equivalent currents; The following results are obtained by comparative analysis and mathematical statistics: (1) by the use of physical optics method and equivalent electromagnetic current method, the scattering intensity for each part of the model and RCS characteristic of the aircraft can be analyzed efficiently and accurately; (2) compared with model A, the mean RCS value of model B is reduced to 14.1% in forward direction and 48.1% in lateral direction; (3) compared with model A, the mean RCS value of model C decreases to 11.4% in forward direction and 21.6% in lateral direction. The results are expected to provide theoretical basis and technical support to the conceptual design of aircraft and stealth technology research.

• 한국정밀공학회지
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• 제22권3호
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• pp.86-92
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• 2005

In this paper a forward-backward can extrusion process are analyzed by using rigid-plastic FEM simulation. FEM simulation is conducted to investigate forming characteristics such as deformation modes fur different process parameters. Design parameters such as thickness ratio, punch angle, friction factor and diameter ratio are selected to study the effect of them on the pattern of material flow. The analysis is focused mainly on the influences of the design factors on deformation pattern in terms of forming load, extruded length ratio and volume ratio. It is known for the simulation that the forming load, the length ratio and the volume ratio increase as the thickness ratio (TR), the wall thickness in forward direction to that in backward direction, decreases. The various punch angles have slight influence on the forming load. length ratio and volume ratio. However friction factor have little effect on the forming characteristics such as the forming load, volume ratio and so on. In addition the forming load increases as diameter ratio (DR), the outer diameter of a can in forward direction to that in backward direction, increases. Furthermore the extruded length ratio is lowest with a certain value of DR=0.85 among diameter ratios. Pressure distribution exerted on the die-material interface is illustrated schematically.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.476-479
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• 2007

The selection of the support system is an important design parameter in design and construction of the tunnel using the new Australian tunnel method. It is a common practice to select the support based on the rock mass grade, in which the rock mass is classified into five rock groups. The method is applicable if the characteristics of the rock mass are uniform in the vertical direction. However, such case is seldom encountered in practice and not applicable when the properties vary along the vertical direction. This study performs comprehensive three dimensional finite difference analyses to investigate the ground deformation pattern for cases in which the rock mass properties change in the vertical direction of the tunnel axis. The numerically calculated displacements at the tunnel crown show that the displacement is highly dependent on the stiffness contrast of the rock masses. The results strongly indicate the need to select the support type $0.5{\sim}1.0D$(vertical direction) on the rock mass boundary. The paper proposes a new guideline for selecting the support type based the results of the analyses.

• 한국공간구조학회논문집
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• 제18권3호
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• pp.133-140
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• 2018

Vertical earthquake motions can occur along with horizontal earthquakes, so that Structure should be designed to resist Seismic loads in all directions. Especially, due to the dynamic characteristics such as the vibration mode, when the vertical seismic load, the dynamic response of the Spatial structure is large. In this study, the seismic response of the lattice dome to horizontal and vertical seismic loads is analyzed, and a reasonable seismic load combination is analyzed by combining horizontal and vertical seismic response results. In the combination of the horizontal seismic load, the largest result is obtained when the direction of the main axis of the structure coincides with the direction of seismic load. In addition, the combination of vertical seismic load and horizontal seismic load was the largest compared with the combination of horizontal seismic load. Therefore, it is considered that the most reasonable and stable design will be achieved if the seismic load in vertical direction is considered.

• 패션정보와 기술
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• 제3권
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• pp.48-54
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• 2006

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2001년도 Bulletin of The 5th Asian Design Conference International Symposium on Design Science
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• pp.15.2-15
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• 2001

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 추계학술발표대회 논문집
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• pp.157-158
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• 2007

This is an interior design for a furniture & lighting design exhibition. The concept of design is to secure the smooth flow planning of an audience and effective direction of an exhibit Design content include 1) installation(passage of light) to guide an audience from entrance to right side of the exhibition space to prohibit the flow dispersion and keep smooth continual circulation flow plan 2)image-wall to introduce exhibition 3)installation to help the global understanding of exhibit 4)exhibition stand design considering proper height of audience's eye.

• 한국정밀공학회지
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• 제10권2호
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• pp.76-85
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• 1993

Based on the cutting force model, three-dimensional optimal design model was developed and optimal designed tool which is minimized cutting force is developed by computer simulation technique. In this model the objective function which is minimized resultant cutting force was used and the variables are radial rake angle, axial rake angle, lead angle of the tool. The cutting forces using conventional and optimal tools by simulation, are compared and analyzed in time and frequency domains. In time domain the cutting force of optimal tool in feed direction was more reduced and less fluctuated than that of conventional tool. Cutting forces of optimal tool in X-and Z-directions are shown a little increased than those of conventional tool. In frequency domain amplitude of insert frequency components of optimal tool in feed direction was more reduced than that of convent- ional tool. The amplitudes of insert frequency components of optimal tool in X-and Z-direction are a little increased than those of conventional tool. As the reduction of amplitude and fluctuations of the cutting force, Optimal tool is considered that tool life and surface roughness would be improved, and stable cutting would be expected.

• 대한공간정보학회지
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• 제20권4호
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• pp.145-151
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• 2012

본 연구는 최근 건설 산업의 큰 흐름으로 시도되고 있는 건설 공간 정보 모델링을 위한 BIM 핵심 기술 중 하나인 라이브러리와 관련되어 IFC와는 또 다른 관점에서 파라메트릭 모델링 및 알고리즘을 묘사할 수 있는 중립 라이브러리 개발을 위한 기술 요소와 효과적인 개발 방향을 제안한다. 이를 위해 최근 관련 연구를 고찰하고 현재 활용되고 있는 라이브러리를 이용한 대표적인 BIM 모델러인 Revit, ArchiCAD의 라이브러리 기술을 분석하였다. 분석된 결과를 바탕으로 BIM 파라메트릭 모델 구조 및 알고리즘 정의를 위한 기술적 공통 요소들을 분석하고 개념적인 연구를 통해 이런 요소들을 포함한 BIM 묘사 스크립트 언어 기반 중립 라이브러리 개발 방향을 제시하였다.