• 한국의류산업학회지
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• 제11권1호
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• pp.112-120
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• 2009

The purpose of this study is to develop Andongpo apparel pattern design connected with the Apparel CAD system. It includes pattern making, grading, marking program. In this study, it will be able to make apparel pattern quickly and accurately by using Apparel CAD system. The results were as following : Computerization of the pattern making process is expected to provide higher accuracy and efficiency in apparel pattern making for narrow and expensive Andongpo. ESMOD pattern making method was selected as basic pattern. Tailored jacket patterns were developed for Andongpo. Refer to and . The jacket patterns developed is automatically depicted by inputting consumer's body size. Tailored jacket patterns for Andongpo were marked by using marking program in Apparel CAD system. The efficiency of marking appeared of 70% or more in Andongpo jacket patterns. This results is showed it has an effect on narrow and expensive Andongpo. 3tailored jacket patterns will be able to make a simulation by 3D Apparel CAD system. The results of this study is expected to provide higher consumer's satisfaction and internet brand launching. In addition, encouraging majority of the young to participate in using CAD program for Andongpo is regarded as beneficial for the reinforcement of competitiveness of traditional clothing business.

• 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.

• 한국CDE학회논문집
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• 제6권2호
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• pp.133-139
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• 2001

Since a great number of 2D engineering drawings are being used in industry and at the same time 3D CAD becomes popular in recent years, we need to reconstruct 3D CAD models from 2D legacy drawings. In this thesis, a combination of a feature recognition method and an expert system is suggested for the 3D solid model reconstruction. Modeling primitives of 3D CAD systems are recognized and constructed by using the pattern matching technique of the features modeling. Additional information for the 3D model reconstruction can be generated by extracting symbols or text entities which are related to form entities. For complex and indefinite cases which cannot be solved by the process of feature recognition, an expert system with a rule base has been used for decision-making. A 3D reconstruction system which recognizes 2D DXF drawing files has been implemented where models composed with protrusions, holes, and cutouts can be handled.

• The Journal of Advanced Prosthodontics
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• 제16권2호
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• pp.115-125
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• 2024

PURPOSE. The purpose of this in vitro study was to investigate the fracture resistance, surface hardness, and color stain of 3D printed, CAD-CAM milled, and conventional interim materials. MATERIALS AND METHODS. A total of 80 specimens were fabricated from auto polymerizing polymethyl methacrylate (PMMA), bis-acryl composite resin, CAD-CAM polymethyl methacrylate resin (milled), and 3D printed composite resin (printed) (n = 20). Forty of them were crown-shaped, on which fracture strength test was performed (n = 10). The others were disc-shaped specimens (10 mm × 2 mm) and divided into two groups for surface hardness and color stainability tests before and after thermal cycling in coffee solution (n = 10). Color parameters were measured with a spectrophotometer before and after each storage period, and color differences (CIEDE2000 [DE00]) were calculated. The distribution of variables was measured with the Kolmogorov Smirnov test, and one-way analysis of variance (ANOVA), Tukey HSD, Kruskal-Wallis, Mann-Whitney U tests were used in the analysis of quantitative independent data. Paired sample t-test was used in the analysis of dependent quantitative data (P < .05). RESULTS. The highest crown fracture resistance values were determined for the 3D printed composite resin (P < .05), and the lowest were observed in the bis-acryl composite resin (P < .05). Before and after thermal cycling, increase in mean hardness values were observed only in 3D printed composite resin (P < .05) and the highest ΔE₀₀ value were observed in PMMA resin for all materials (P < .05). CONCLUSION. 3D printing and CAD-CAM milled interim materials showed better fracture strength. After the coffee thermal cycle, the highest surface hardness value was again found in 3D printing and CAD-CAM milled interim samples and the color change of the bis-acryl resin-based samples and the additive production technique was higher than the PMMA resin and CAD-CAM milled resin samples.

• 한국전자파학회논문지
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• 제11권3호
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• pp.437-444
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• 2000

본 논문에서눈 빠른 모델링과 정확한 계산을 위하여 상용 CAD인 PATRAN을 이용하여 3차원으로 설계한 휴대폰을 1 mm 해상도의 FDTD 모델령으로 직접 변환시키는 방법을 제안하였다. 이 방법의 우수성을 확인하기 위하여 3차원 과도 원거리 영역 변환법으로 계산한 복사패턴과 무반사실에서 이득비교법으로 측정한 결과를 비 교하였을 때 그 차이는 0.5 dB 이내이다. 또한,SAR과 직접적으로 관련한 물리량을 찾기 위해서 휴대폰의 전면 부에 형성되는 자기장을 계산하였다. 그 결과, 휴대폰 내부로부터 전면 방향으로 복사되거나 휴대폰 본체 길이 방향의 자기장 성분보다는 너비방향으로 흐르는 자기장 성분이 전체자기장에 가장 큰 영향을 주었다.

• 한국기계가공학회지
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• 제19권9호
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• pp.59-70
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• 2020

Three-dimensional (3D) design data is used for various purposes throughout the life cycle of a plant construction project. Plant 3D CAD systems support 3D modeling based on specs-catalogs, which contain data that are used for different purposes such as design, procurement, production, and handover. Therefore, it is important to share the spec-catalog data in the 3D design model with other application systems. Sharing this data thus requires a system that extracts spec-catalog data from plant 3D CAD systems and converts them into neutral model data. In this paper, we analyze equipment spec-catalog data of plant 3D CAD systems and, based on these analyses, define the data structure for neutral spec-catalog data. We subsequently propose a procedure that translates native spec-catalog data to neutral model data and develop a prototype system that performs this operation. The proposed method is then experimentally validated for the test spec-catalog data.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.177-180
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• 2005

Three dimensional shaded images are standard visualization method for CAD models on the computer screen. Therefore, much of the effort in the visualization of CAD models has been focused on how conveniently and realistically CAD models can be displayed on the screen. However, shaded 3D CAD data images captured from the screen may not be suitable for some application areas. Technical document, either in the paper or electronic form, can more clearly describe the shape and annotate parts of the model by using projected 2D line drawing format viewed from a user defined view direction. This paper describes an efficient method for generating such a 2D line drawing data in the vector format. The algorithm is composed of silhouette line detection, hidden line removal and cleaning processes.

• International Journal of CAD/CAM
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• 제6권1호
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• pp.3-8
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• 2006

The application of three-dimensional (3-D) CAD has been popularized for design and production and digital manufacturing has been spreading in many industrial fields. By simulation of the production process using 3-D digital models, which are the core of CIM (Computer Integrated Manufacturing) system, the efficiency and safety of production are improved at each stage of work, and optimization of manufacturing can be achieved. This paper firstly describes the concept of "simulation based production" in shipbuilding and also digital manufacturing; the 3-D CAD system is indispensable for effective simulation because ship structure is three dimensionally complex. By simulation, "computer optimized manufacturing" can be possible. The most effective fields of simulation in shipbuilding are in jobs where many parties have to cooperate, while existing two-dimensional drawings are hardly observed the whole structures due to interference between structures or equipment of complex shape. In this paper some examples of the successful application in IHIMU (IHI Marine United Inc.) are shown: assembly of a pipe unit, erection of a complex hull block, carriage of equipment, installation of a propeller, and access in an engine room.

• 구강회복응용과학지
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• 제32권2호
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• pp.141-148
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• 2016

Computer-aided technology는 최근 치과 치료의 흐름이다. DENTCA$^{TM}$ CAD/CAM denture (DENTCA Inc.)는 상용화된 computer-aided design/computer-aided manufacturing (CAD/CAM) 의치 시스템 중 하나로, 한 번의 내원을 통해 의치 제작에 필요한 환자의 모든 정보를 획득하여, 이 정보를 컴퓨터에 저장하고 3D 프린팅을 통해 두 번째 내원 시에 의치 장착을 목표로 한다. 현재까지 여러 증례들은 총의치 제작에 대한 CAD/CAM system의 임상적 적용을 시험해 보았다. 본 증례는 두 명의 환자에서 DENTCA system을 이용한 의치와 전통적인 방법을 이용한 의치를 동시에 제작하여 DENTCA system의 효용성과 한계점을 고찰하였다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.357-360
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• 2007

In the area of domestic construction industry, recently, standardization of construction. globalization of constructional and a building information arc required to advance increase productivity, shorten the term of works and reduce the cost of construction. The objective of this is to offer basic data of process new thesis and development for automated building equipment design system based on 3D CAD building information. This study contribute the development of automated Building equipment design system based on 3D which helps to conduct the equipment design handily and quickly.