• 패션비즈니스
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• 제19권5호
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• pp.1-16
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• 2015

The appearances and geometry structures of knitted fabrics have important effects on their functions as textile fabrics. Structural design of the woven fabric, prior to the manufacturing processes in the weaving mill, often leads to a similar predictable appearance in the final outcome with the corresponding weave design. The increase of the employment of elastic textile yarns in knitting fabrics for comfort stretch or outdoor sports wear knit products has, however, resulted in difficulties in predicting the final appearance of the knit structure design. Due to the stretchability and exceptional recovery behavior of the elastic yarns such as polyurethane elastomeric yarns, the appearance of the final product often differs from the initial knit design. At textile CAD program for preparing tricot knit designs has been employed in this study to predict the two dimensional appearance of the design. The similarities between the designs and corresponding knit products seem to be acceptable for the two-dimensional textile CAD program in this study. However, when elastomeric yarns are partially employed in the polyester filament tricot product, a considerable amount of departure from the design is apparent due to the constriction and/or deformation of property differences in the elastomeric yarns and polyester filament yarns. Therefore, another purpose of this study is to measure the departure of the final tricot product from the initial tricot design, especially in the case employing elastomeric yarns in the knit structure together with regular polyester filament yarns. For measuring the three-dimensional departure, a 3D scanning system has been used for the mesh reconstruction of the fabric specimen. Hopefully, the result from this study will be used as a guide to modify and improve the current textile CAD program proposed for the two-dimensional simulation of the tricot.

• Journal of Advanced Marine Engineering and Technology
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• 제33권2호
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• pp.304-312
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• 2009

Automated design system of injection mold was developed in this study. Shapes of mold parts and mold base were defined according to standards of mold components and database modules of mold components were built. And then an automation program of mold design was developed by the user definition features, family table and Pro/Program of Pro/Engineer. The automatic production divided into mold base and standard parts was manipulated to manufacture parts meeting the design requirements and the selected parts were changed in size and shape to meet the design goals. The mold design was also carried out to have organic relations and be easy in case of a change to the mold part or mold base. As a result, it is possible to design the mold efficiently and conveniently modify the designed mold parts and base by using the developed automated design system in this study.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅲ
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• pp.1609-1612
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• 2003

We designed and implemented electronic catalog system for 3D CAD using XML. The XML(extensible Markup Language) is a Markup Language to describe data structure. XML was originally designed to meet the challenges of large-scale electronic publishing. XML Is also playing an increasingly important role in the exchange of a wide variety of data on the Web and elsewhere. This XML catalog helps you easily create and edit the construction materials data. If you want to obtain informations from the construction materials data which is used by object-oriented 3-D CAD program then this system helps you.

• 대한조선학회논문집
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• 제45권4호
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• pp.432-440
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• 2008

Korean shipbuilders are starting to use three dimensional solid CAD systems to enhance their competitiveness in design and production. Despite many merits, three dimensional CAD systems reveal some problems in pipe-line modeling. Pipe-line modeling is heavily dependent on point data in routing. However, since the models built by sweeping or skinning operations do not have data about points and lines on the surfaces, the point data for routing are currently manually calculated by considering the diameters of the pipes and alignment conditions with other pipes. This process is inefficient and prone to errors. In order to enhance the pipe modeling, this paper presents an Offset Routing Program for a three dimensional CAD system, which aids designers to easily define the start points and to generate the pipe routings using reference objects.

• 한국전산구조공학회논문집
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• 제22권3호
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• pp.243-250
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• 2009

최근 기업에서는 설계 기간을 단축하기 위하여 기존의 CAD시스템들의 기능을 기업의 목적에 맞게 수정할 수 있는 커스터마이징 기술이 요구되고 있다. 이에 대부분의 상용 CAD시스템 개발회사들은 일련의 반복된 작업을 자동으로 수행할 수 있게 해주는 매크로나 외부 프로그램을 작성할 수 있도록 API를 제공하고 있다. 본 논문은 지식기반의 제품개발 체계를 구축하기 위하여 특정 부품의 정형화된 설계 규칙을 3D CAD 템플릿으로 개발하여 특정 모델링을 보다 편리하게 수행할 수 있도록 하는데 목적이 있다. 냉장고의 부품 설계에 요구되는 관련 수식, 데이터 및 설계지식을 Unigraphics의 UG/Open API를 이용하여 프로그램화하였고 그 개발사례를 제시하였다. 상용 CAD시스템에 연결하여 사용함으로써 설계 검증 및 설계 변경을 제품설계 업무에 효과적으로 적용하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.63-65
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• 2006

These days, it is not easy to construct the transmission line because of the environmental association activity, a civil appeal, etc. To solve these kinds of difficulties, the program with leading-edge IT technology, such as GIS, 3 dimensions CAD, computer graphic, etc., is developed to be more transparent and objective in the design stage of the transmission line and the selection stage of the transmission line route. Comparing this program with previous methods, this program is composed of the environmental evaluation program, data producing program for analysis and selecting line route program because it is not possible to conduct those kinds of work without any help from the computer and well-developed program. To confirm the performance of the program, the result from the program and the human were compared. Therefore, the result from the program was same as the result conducted by human. In addition, the program makes the selection of the transmission line route easier by checking the mountainside, lumbering, the estimated cost of the tower construction, etc. in real-time.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.410-413
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• 2001

This paper is to model a 3D-shape product applying mathematically the data acquired from a 3D scanner and using an Automatic Design Program. The research studied in the reverse engineering up to now has been developed continuously and surprisingly. However, forming 3D-shape solid models in CAE and CAM, based on the research, the study leaves much to be desired. Especially, analyses and studies reverse-designing automatically using measured data after manufacturing. Consequently, we are going to acquire geometric data using an 3D scanner in this study with which we will open a new field of reverse engineering by a program whic hcan design a 3D-shape solid model in a CAD-based program automatically.

• 감성과학
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• 제14권1호
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• pp.39-48
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• 2011

3D스캔-인체 및 의복 모델링-시뮬레이션-패턴 제작 및 검증의 전체 3D 의복제작 프로세스를 원활히 활용할 수 있도록 하기 위하여 3D 그래픽과 CAD 시스템 그리고 3D-2D 직접 패턴 전개 시스템을 이용해야 하는 데 이 때 장애가 되는 것은 3D 시뮬레이션한 가상의복으로부터 정확한 패턴을 추출하는 것이 어렵고, 전반적 과정의 호환이 쉽지 않다는 것이다. 이에 본 연구에서는 인체에 정확히 밀착된 부분과 드레이프가 있는 비대칭형 드레스를 대상으로 전체 프로세스를 원활하게 구동할 수 있는 방법을 모색하였다. 연구 방법으로는 3D 스캔 데이터를 이용하여 Maya로 범용성 3D 인체 모델을 만들고 이 3D 바디 모델에 맞는 3D 드레스를 디자인하고 모델링한 후, Rapidform, 2C-AN 프로그램과 YukaCAD를 이용하여 정확한 2D 패턴을 제작하는 과정의 호환성을 해결하며 진행하였다. 이 과정에서 도출한 패턴을 실제 의상으로 제작하여 착의 시킨 후 3D 의복 모델과의 여유분 분포를 3차원 측정 기술로 검증하였고 실물 드레스의 드레이프의 모양과 시뮬레이트된 드레스의 모양을 검토하였다. 그 결과 제시한 방법을 활용하면 전반적으로 만족스럽게 정량적인 3D 의복 제작 프로세스를 운영할 수 있음을 확인하였다.

• 대한기계학회논문집A
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• 제27권10호
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• pp.1748-1753
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• 2003

This paper describes the forming of fine gear housing using RP system. In order to apply 3D model formed through CAD software to RP system, it is necessary of transforming 3D model into STL file format. Besides, when the same shape is formed repetitively, we must solve the program that the shape accuracy of prototype is irregular. Therefore, we will make an experiment on influence of 3D model, file transformation and prototype on facetres, AutoCAD system value. On the basis of experimental result, we will develop an automatic file transformation program for RP. In the final process, we will manufacture on a better prototype according to the experiment result of fine gear housing.

• 한국CDE학회논문집
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• 제19권1호
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• pp.41-49
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• 2014

For the reuse of the existing 3D block model of a ship, we analyze the hull modeling process using AVEVA Marine which is a representative CAD (Computer-Aided Design) system for the shipbuilding. In the AVEVA Marine environment where the design engineer makes 3D model on the 2D view that is so-called 2.5D, it cannot be possible to copy to reuse the block model just simply copying the 3D feature model itself like in the general mechanical CAD system or Smart Marine 3D which are on the basis of the 3D model representation. In this paper, we analyze the scheme file where the 3D model is defined in AVEVA Marine so that we develop the program for the block copy and the translation using this scheme file. It is significant that this program can be immediately available as a real-world application on the AVEVA Marine environment.