• Journal of information and communication convergence engineering
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• v.9 no.5
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• pp.567-572
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• 2011

As the mobile devices have powerful CPUs and memories, it is possible to carry the large volumes of design drawings, such as DXF files, on mobile devices. However, since the format of a DXF file is the ASCII, it has the shortcoming where the size of a file is larger than a binary formatted file and it is difficult to display the entities of drawings quickly on mobile devices. In this paper, we design the DXF manager system on a smart phone. To speed up the rate of the display and panning, the DXF manager hires the spatial index, the fixed grid file. We also implement the system on the Samsung Omnia-1$^{(R)}$ to exploit the Windows Mobile$^{(R)}$ operating system.

• 한국전산유체공학회:학술대회논문집
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• 2004.03a
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• pp.202-207
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• 2004

In the present study a mesh generation program has been developed by using DXF file. The program consists of DXF file reading and mapping algorithm, which projects the 2-D mesh point onto the triangular surface constructed by nearest three points. The present program has been tested for mesh generations for the road tunnel ventilation analysis and analysis of lava movement in mountain area.

• Journal of Digital Contents Society
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• v.13 no.1
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• pp.31-36
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• 2012

Since the national standard topographic map is made by DXF format which is the results of the National Geographic Information System project and lots of CAD data and scanners can be used to acquire the data easily, the imports of existing DXF file will decrease the costs and time for data acquisition process. In addition, the spatial data such as topographic map should be able to convert to the middle file format such as PostScript in order to be exported into other systems. For this purpose, I design and implement three units of modules, which are File Manipulation Module, MVF Import Module, and MVF Export Module. Finally, I verify the actual transformation of topographic map that are DXF file format by conducting the series of tests.

• Journal of computational fluids engineering
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• v.9 no.4
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• pp.7-12
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• 2004

In the present study a semi-automatic mesh generation program has been developed by using DXF file containing contour line data. The program consists of DXF file reader and mapping algorithm. Pre-generated 2-D planar mesh points are to be mapped one by one onto triangular surface whose three vertices are three nearest contour points surrounding the mapping point. The present program has been successfully tested for mesh generations for the road tunnel ventilation analysis and analysis of lava movement in mountain area.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2777-2781
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• 2001

This paper presents an algorithm of the watermark insertion and extraction on the vector image. Most parts of the vector image consist of the array of the coordinate values. The vector watermarking method by Sakamoto et al [1] uses the mask within which all the coordinate values of all the vertices are changed depending on the value of the watermark. The proposed algorithm is the change of the vector image file instead of the change of the coordinate values on the vector image. We use the Drawing Exchange Format (DXF) files since the DXF file is one of the general files in the field of the vector image.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1998.03a
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• pp.106-111
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• 1998

NC code has to be made after changing the drawing information to DXF file, the converting file. Arranging the information ordered irregularly when DXF file is made decrease the unnecessary time of rapid feed during working and the DATA capacity when the information is changed. This CAM program can be used easely for the beginner of the minor enterprises. The connection of operations and the use of GUI increase business efficiency.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1415-1418
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• 2006

최근 정보 관련 산업 발달과 더불어 공간 정보의 중요성이 점점 강조되어, 국가 차원의 지리정보체계가 구현되고 있다. 국토지리정보원이 구축하고 있는 수치지도는 DXF로 제작되는데, 이 DXF맵은 GIS분야에서 필요한 속성정보나 위상정보를 갖지 못하여 지리정보 통합에 어려움이 있다. 지리정보의 여러 분야에 걸쳐 효율적인 데이터의 공유가 가능하도록 DXF파일에서 공간 개체를 추출하는 연구는 매우 중요하다. 본 논문에서는 DXF 파일에서 다양한 공간 개체를 추출하는 효율적인 공간 개체 추출기를 제안한다. 공간 개체 추출기는 DXF파일을 구성하는 요소들 중에 POLYLINE, POINT, CIRCLE, TEXT, ARC, LINE의 수치값을 비교하여 그에 해당하는 좌표값을 DAT 파일에 저장한다. 제안된 시스템은 웹상에서도 사용할 수 있다. 사용자는 단순히 웹서버에 DXF 파일을 업로드해서 공간 개체 추출기를 실행하여 결과를 다운로드 받아 활용할 수 있다.

• Proceedings of the CALSEC Conference
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• 2000.08a
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• pp.83-95
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• 2000

CAD 시스템간 데이터 구조 차이에 의한 교환 및 공유에 대한 문제, 동일 CAD 시스템의 버전 변화에 따른 데이터 호환성 결여, CAD 정보의 보관 및 재사용성 부족(중략)

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.466-469
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• 2002

Burr is a projected part of finished workpiece. It is unavoidable and undesirable by-product of most metal cutting or shearing process. Also, it must be removed to improve the fit of machined parts, safety of workers, and the effectiveness of finishing operation. But deburring process is one of manufacturing processes that have net been successfully automated, so deburring automation is strongly needed. This paper focused on developing a basic algorithm to find edge of workpiece and match two different image data for deburring automation which includes automatic recognition of parts, generation of deburring tool paths and edge/corner finding ability by analyzing the DXF drawing file which contains information of part geometry. As an algorithm for corner finding, SUSAN method was chosen. It makes good performance in finding edge and corner in suitable time. And this paper suggested a simple algorithm to find matching point between CCD image and drawing file.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.05a
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• pp.1016-1020
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• 2000

In this study, a structural characteristics analysis system for motor-integrated high-speed spindle systems, “SpindleX”, is developed based on the Timoshenko theory and the multi-layered finite element method. Since “SpindleX” has the various analysis modules related to static deflection analysis, modal analysis, frequency response analysis, unbalance response analysis and so on, it is useful in performing systematically and quantitatively the design and evaluation processes of spindle system under the windows GUI environment. Also, to enhance the user-friendliness, “SpindleX” possesses the various additional functions such as the DXF file interface for auto-importing the shape and geometric data of spindle system from the DXF file, the bearing database for auto-importing the mechanical properties and geometric data of bearing by the bearing number, and the graphical visualization for certificating the imported and analysed data of spindle system.