• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.8
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• pp.1506-1511
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• 2002

A computer aided expert system fur spur, helical, bevel and worm gears was newly developed by using AutoiCAD system and its AutoLISP computer language in the present study. Two methods are available for a designer to draw a gear. The first method needs the gear design parameters such as pressure, module, number of tooth, shaft angle, velocity, materials, etc. When the gear design parameters are inputted, a gear is drawn in AutoCAD system and maximum allowable power and shaft diameter are calculated additionally. The second method calculates all dimensions and gear design parameters to draw a gear when the information such as transmission, reduction ratio, nm, materials and pressure are inputted. The system includes four programs. Each program is composed of a data input module, a database module, a strength calculation module, a drawing module, a text module and a drawing edit module. In conclusion, the CAD system would be widely used in companies to find the geometric data and manufacturing course.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.10
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• pp.1537-1541
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• 2010

An inkjet printing system for printed electronics was developed. In this study, a printing algorithm was mainly discussed. In order to print a pattern image at a target location, we developed a hardware and software algorithm for determining the distances between a substrate camera and the selected nozzles. We implemented a vector-printing algorithm where AutoCAD dxf file was used for XY motion control and for printing. We also developed printing method using bitmap images. The technical issues in using CAD drawings and bitmap images were discussed.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 1996.10a
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• pp.322-329
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• 1996

The objective of this study is to develop the CAD system for 2 cell box culvert by ultimate strength design method. C-language & AutoCAD Rl2 were used to create user-friendly computing environment. Consequently, users can easily design 2 cell box culvert under the various conditions, such as design load, total fill depth, underground water level, strength of concrete, and so forth. This system is believed to improve the efficiency and economy by the batch processing of structural analysis, quick drafting and computation of material quantity in the 2 cell box culvert design.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10a
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• pp.509-512
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• 2000

본 논문은 강관 제조회사의 생산체제를 전자동화하기 위한 일차적인 준비단계로 원.부자재관리를 자동화하기 위한 엔지니어링데이터의 생성 및 이의 관리에 초점을 둔 응용프로그램의 개발에 관한 내용이다. PowerBuilder 와 Oracle 그리고 AutoCAD를 이용하여 강관생산과 관련된 엔지니어링데이터베이스를 구축하고 이를 통합 관리하며 CAD를 제품의 설계 및 품질검사에 적용함으로서 생산 제품의 품질향상을 높일 수 있도록 개발되었다.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.12
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• pp.230-238
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• 1999

This paper describes a research work of developing computer-aided design of lead frame, semiconductor, with blanking operation which is very precise for progressive working. Approach to the system is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. This system has been written in AutoLISP on the AutoCAD using a personal computer and in I-DEAS Drafting Programming Language on the I-DEAS Master Series Drafting with Workstation, HP9000/715(64) and tool kit on the ESPRIT. Transference of data among AutoCAD, I-DEAS Master Series Drafting, and ESPRIT is accomplished by DXF(drawing exchange format) and IGES(initial graphics exchange specification) methods. This system is composed of six modules, which are input and shape treatment, production feasibility check, strip-layout, die-layout, modelling, and post-processor modules. The system can design process planning and Die design considering several factors and generate NC data automatically according to drawings of die-layout module. As forming process of high precision product and die design system using 2-D geometry recognition are integrated with technology of process planning, die design, and CAE analysis, standardization of die part in die design and process planning of high pression product for semiconductor lead frame is possible to set. Results carried out in each module will provide efficiencies to the designer and the manufacturer of lead frame, semiconductor.

• Proceedings of the KAIS Fall Conference
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• 2000.04a
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• pp.76-76
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• 2000

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.2
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• pp.117-131
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• 2007

Representation of building internal space is an active research area as the need for more geometrically accurate and visually realistic increases. 3 dimensional representation is common ground of research for disciplines such as computer graphics, architectural design and engineering and Geographic Information System (GIS). In many cases CAD plans are the starting point of reconstruction of 3D building models. The main objectives of building reconstruction in GIS applications are visualization and spatial analysis. Hence, CAD plans need to be preprocessed and edited to adapt to the data models of GIS SW and then georeferenced to enable spatial analysis. This study automated the preprocessing of CAD data using AutoCAD VBA (Visual Basic Application), and the processed data was topologically restructured for further analysis in GIS environment. Accuracy of georeferencing CAD data was also examined by comparing the results of coordinate transformation by using digital maps and GPS measurements as the sources of ground control points. The reconstructed buildings were then applied to visualization and network modeling.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.10a
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• pp.561-565
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• 1993

본 연구에서는 산업 현장에서 일반적으로 가장 많이 사용되는 CAD 소프트웨어를 이용하여 모든 기계류에 공통적으로 쓰이는 기본적인 기계 요소들에 대한 자동 설계 시스템을 구축하려는데 목적을 둔다. 이는 단순히 제도 수준에만 머무르고 있는 현재의 CAD 시스템에 사용 조건에 맞는 기계요소에 대한 강도를 평가하여 적절한 기계 부품을 자동적으로 선정하고 도면으로 보여 주는 기능을 부여하여 생산성을 높이는데 그 의미가 있다. 또한 설계 과정의 자동화 가능성 여부에 대한 타당성을 검토하고자 한다. 연구방법으로는 C언어를 이용하여 각 기계 부품에 대한 설계(선정) 프로그램과 데이타 베이스 관리 프로그램을 작성하고, LISP언어를 이용하여 선정된 기계 부품을 자동적으로 그려 주는 방안을 제시한다. 개발에 사용된 CAD 소프트웨어는 PC에서 가장 많이 사용되는 AutoCAD를 사용한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1991.10a
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• pp.254-260
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• 1991

본 연구는 CAD데이터로 부터 부품의 형상을 인식하여 CAD시스템과 인터페이스된 자동공정설계시스템을 지식공학적 접근방법을 도입하여 개발하고자 함이 연구의 목적이다. 연구의 대상은 NC선반가공용 회전형상부품을 대상으로 하며, CAD시스템은 AutoCAD를, 소프트웨어개발에 사용된 프로그래밍언어는 Turbo-C(Version 2.0)를, 전문가시스템셀(Expert System Shell)은 CLIPS를 이용하여 개인용컴퓨터(PC)를 사용하여 개발한다. 본 연구의 내용은 NC선반가공용 회전형상부품을 대상으로 CAD/CAPP 데이터베이스 생성과 부품형상인식, 공정 및 작업의 선정, 가공순서의 결정에 대한 알고리즘을 개발하고, 공학적 규칙 및 전문가의 경험적 지식을 획득하여 지식베이스를 구축하며, 이 지식베이스를 사용한 공정설계 전문가시스템의 개발에 관한 연구의 중간결과이다.

• Journal of Korea Multimedia Society
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• v.9 no.6
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• pp.709-719
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• 2006

To protect against unlawful reproductions and distribution, the current paper proposes a digital watermarking technique for architectural drawings produced using a CAD system. First, the POLYLINEs are extracted from the drawing; then, an adaptive algorithm is used to embed a watermark in the characteristics of each POLYLINE. Next, the CIRCLEs are embedded using an adaptive watermarking algorithm related to the radius of circle from drawing. The proposed watermarking scheme is robust to various attacks, such as the geometrical transformation. Additionally, the proposed method satisfies the requirement of transparency for CAD program. It used AutoCAD 2002, which is commonly used as a CAD program for experiments. Experimental results confirmed the robustness and invisibility of the embedded watermarks in several conversions of an architectural drawing.