• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2002년도 춘계학술발표대회 논문집
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• pp.111-115
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• 2002

CAD System, which has been actively applied since late 80's, has become one of the most important tools in architectural design and has taken the central position in practical design processes. However, it is widely known that AutoCAD, the market-leading general-use CAD System, resulted in hindering the standardization of CAD System. This has been causing problems in communication among designers and inefficiency in their uses. The standardization in CAD System becomes an urgent issue. The study attempts to build up fundamental principles in standardization of CAD System, and to suggest a combinational model of international and domestic standards.

• Journal of Computational Design and Engineering
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• 제2권4호
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• pp.253-260
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• 2015

Feature-based NC machining, which requires high quality of 3D CAD model, is widely used in machining aircraft structural part. However, there has been little research on how to automatically detect the CAD model errors. As a result, the user has to manually check the errors with great effort before NC programming. This paper proposes an automatic CAD model errors detection approach for aircraft structural part. First, the base faces are identified based on the reference directions corresponding to machining coordinate systems. Then, the CAD models are partitioned into multiple local regions based on the base faces. Finally, the CAD model error types are evaluated based on the heuristic rules. A prototype system based on CATIA has been developed to verify the effectiveness of the proposed approach.

• International Journal of Automotive Technology
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• 제3권2호
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• pp.47-52
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• 2002

The integration of CAD/CAM/CAE in product development is the key to realize concurrent engineering. Generally, different systems are employed in product development departments. These different systems create a lot of trout)toes such as difficulty in communication, misunderstanding and so on. A new approach to integrate CAD/CAM/CAE in one system based on CATIA thor the end-to-end process in cylinder head development is presented. Hulti Model Technology (MMT) is used to create consistent and associated CAD models for the end-to-end process in cylinder head development. The concept and method to create and organize multi models are discussed. A typical four-layer structure of HHT for mechanical products is defined. The multi level structure of the cylinder head models based on MMT is provided. The CAD models of cylinder head created based on MMT can be used as the consistent model. All models in the downstream of cylinder head development such as structure analysis, CFD, sand core design , casting simulation and so oil are associated with the CAD models. Practice shows the approach in this paper enables the development process to be carried concurrently and can obviously shorten time to the market, reduce product cost and improve product quality.

• 산업기술연구
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• 제22권B호
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• pp.79-88
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• 2002

This paper deals with a case study on the process improvement and the layout design of a boiler factory with FactoryCAD. Firstly, two alternatives of job reallocation are suggested with the understanding of problems in current process. The layout planning for these new alternatives is carried out by simple procedure and the detailed analyses are performed by the aid of FactoryCAD program. The result shows that the new layout plan brings on about 10% reduction of travel distance. The utilization of FactoryCAD program can simplify the process of layout design.

• Journal of Mechanical Science and Technology
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• 제15권8호
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• pp.1108-1118
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• 2001

The purpose of this study is to establish a CAD (Computer Aided Design) system for research and development(R&D) of a new product. In the R&D process of a new product, the design objects are frequently redesigned based on the experimental results obtained with prototypes. The CAD/CAE systems (which is based on computer simulation of physical phenomena) are effective in reducing the number of useless prototypes of a new product. These kinds of conventional CAD/CAE systems do not provide a function to reflect the experimental results to the redesign process, however. This paper proposes a methodology to establish the CAD system, which possesses the engineering model of a designed object in the model database, and refines the model on the basis of experimental results of prototype. The blackboard inference model has been applied to infer model refinement and redesign counterplan by using insufficient knowledge of R&D process of new products.

• EDISON SW 활용 경진대회 논문집
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• 제4회(2015년)
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• pp.538-540
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• 2015

In this paper, We have conducted a Compact SELCA-Rod design by using FreeCAD. FreeCAD is many modern design applications such as Revit or CATIA. It is based on the concept of Workbench. A Workbench can be considered as a set of tools specially grouped for a certain task. Also It has an extensive list of features FreeCAD implements. We use this practical tool and proceed the research on Compact SELCA-Rod which is attracted the most IT-related products in 2014. SELCA-Rod is mostly based on rod-shaped form as in name. However rod-shaped design has the biggest problem for mobile Through this research, We propose a new type of SELCA-Rod. It is easy to carry and take pictures from different angle.

• 대한가정학회지
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• 제34권5호
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• pp.249-264
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• 1996

The purpose of this study was to investigate automatic manipulating functions of dart of CAD system, and to classify the dart of women's front bodice. The results from this study: 1.3 CAD systems, were compared in automatic manipulating functions of dart. Gerber system & Investronica system were based on the pivot-method of dart manipulating, Yuka system was based on the slash-method. 2. It is classified and made a dart-design chart with using darts, which were as examples related to dart manipulating in text & reference of the pattern design. 3. In case of education of dart manipulation, the classified dart-design chart provides variations of a basic pattern through dart manipulation.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.291-296
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• 2008

지난 20년간 3D/4D CAD에 관한 연구는 시설물 생애주기의 설계, 시공단계를 중심으로 활발히 진행되어 왔지만 시설물 생애주기 전반에 걸쳐서 3D/4D CAD의 유용성에 관한 연구는 아직까지 미흡한 실정이다. 본 연구에서는 설계, 시공단계에 국한하지 않고 시설물 생애주기 동안의 3D/4D CAD 사용에 따른 유용성을 도출하기 위하여 현재 상용화된 소프트웨어를 사용하여 3D/4D CAD 모델을 생성하였다. 생성된 모델과 기존의 시설물 생애주기 관리 방법을 기반으로 전문가와 포커스 그룹 인터뷰를 실시하여 그 결과를 바탕으로 155명의 시설물 생애주기 관련 업무 수행자들의 설문조사를 통해 3D/4D CAD를 통한 시설물 생애주기 관리 유용성을 도출하였다.

• 대한치과기공학회지
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• 제37권4호
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• pp.271-284
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• 2015

Purpose: The purpose of this study was to examine the usage of CAD/CAM, which is one of dental technologist duties, in an effort to look for any possible changes in the usage of CAD/CAM. It's specifically meant to compare the results of this study with those of Lee Jong-do, Park Kwang-Sig(2011)'s study in March, 2011, to determine if there were any changes over the past four years. The selected variables that were investigated were the ownership of CAD/CAM, awareness of it, the route of acquiring the first information on it, the merits and demerits of its usage, usage experience and educational experience about it. Methods: An online survey was conducted on the dental technologists who worked in urban communities including metropolitan cities to find out the usage of CAD/CAM in 2015 from July 15 to 31, 2015, after existing questionnaire items were modified. The collected data were analyzed by IBM SPSS statistics 22.0, and statistical data on frequency, percentage, mean and standard deviation for each item were obtained. To figure out the characteristics of the subjects and the relationship between their occupational characteristics and the usage of CAD/CAM, crosstabs, independent-samples t-test and one-way ANOVA were utilized. As for the usage of CAD/CAM in 2011, the results of Lee Jong-do, Park Kwang-Sig(2011)'s study were selected, and then a comparative analysis was made. The level of significance was all set at .05. Total 250 questionnaires were distributed to them, and 190(76.0%) were returned. After excluding 23 whose answers were uncertain or seemed to lack reliability, total 167(66.8%) were used in final analysis. Results: As a result of analyzing the usage of CAD/CAM that was one of dental technologist duties, there was a great increase in the ownership of CAD/CAM in their workplaces from 2.4 percent in 2011 to 71.7 percent in 2015, and there was an improvement in awareness about it and the necessity of its usage as well. In 2011, the Internet and mass media were the most common route that they got to know about it. They had a strong tendency to acquire related knowledge through education in 2015, and there were some changes in the products that they used or preferred. In both years, the great merit of CAD/CAM was the simplified manufacturing process of restoration, and it had another great advantages in 2015 such as the improved quality of restoration or improved environments for dental technology. Concerning disadvantages, high price was a big problem in 2011. In 2015, not only price but the burden of material costs, frequent breakdown, poor demand among dental clinics and a lack of CAD/CAM professionals were pointed out a lot. In the future, this researcher intends to make research to seek ways of improving CAD/CAM professionals. Conclusion: There was more awareness of CAD/CAM in 2015 than in 2011 when the changes in awareness of it were analyzed, and the finding suggest the necessity of sustained education and concern.

• 한국산학기술학회논문지
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• 제17권3호
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• pp.42-47
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• 2016

CAD를 이용한 제품의 설계는 전체적인 제품개발공정의 효율성에 있어 핵심적인 역할을 하고 있다. 따라서 설계자가 어떻게 제품을 모델링 하느냐에 따라 모델의 품질이 달라질 수 있으며 이는 이후에 진행되는 하위 공정의 효율성에 지대한 영향을 끼치게 된다. 이에 본 논문에서는 모델의 품질을 향상할 수 있는 모델링 교육 시 강조하여야 할 3가지 개념을 제시하였다. 이러한 개념을 대학에서의 CAD교육에 적용함으로써, 작게는 모델의 변환과정에 소요되는 시간 및 노력을 현저히 감소시키고, 나아가 제품개발공정의 효율성향상과 동시에 궁극적으로, CAD와 CAM같은 서로 다른 도메인간의 통합에 긍정적인 영향을 줄 것으로 기대한다.