• Korean Journal of Construction Engineering and Management
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• v.5 no.4 s.20
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• pp.107-114
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• 2004

This paper represents the application of the 3D CAD Model data for 4D simulation and quantity estimation. These support the effective and practical use of 4D CAD model. By using and manipulating the 3D CAD model information, scheduling and quantity estimation could be developed more quickly and effectively. So the 3D CAD model information is made use of not only drawing a blueprint but also playing an important part of data integration platform. The scheduling module sets up the schedule generation logic that consists of period, priority of element arrangement, and time lag of floor placement. It sorts the working items as a priority of working process. And the quantity estimation module queries the material quantity of the structural elements according to the scheduling conditions. These two modules are developed using the 3D CAD model information and assist the function of 4D CAD model.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.5
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• pp.693-705
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• 2013

Procedural models have the advantage of being easy to edit simply by changing the values of the parameters of their constructional operations. In previous studies, we have introduced an approach for representing procedural 2D CAD models in ISO 10303 and developed ISO 10303-112 for the exchange of procedural 2D CAD models. In this paper, a method for the development of a procedural 2D CAD data translator supporting ISO 10303-112 is suggested. Furthermore, the core techniques applied to the translator are presented. The feasibility of the proposed method was demonstrated through data exchange experiments using a prototype translator.

• Proceedings of the ESK Conference
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• 1995.04a
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• pp.51-51
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• 1995

인체 CAD 모델링 시스템은 장비와 인체를 모델링하여설계 초기단계에서 부터 별도의 Mock-up 없이 전 벙위의 운용자에 대한 작업자세의 안락도(Comfort), 동작한계(Reach), 적 합성(Fit), 시계(Vision)등 제반 작업공간 설계 및 평가에 수반되는 고려요소들을 보다 과학적 이고 합리적으로 반영할 수 있는 도구로 인식되고 있다. 본 연구는 크게 한국군 전차병의 인체 CAD 모델의 설계와 설계된 인체 모델을 활용한 한국형 전차 작업공간 평가로 구성되었다. 한국 군 전차병의 인체 CAD 모델링에서는 전차병의 인체 측정자료를 이용하여 5%, 50%, 95%치 전차병 에 대한 선 자세와 앉은 자세의 인체 모델을 설계하였으며, 보다 정확한 인체 모델의 구현을 위 해인체의 기능적 치수에 대한 실측치와 CAD 설계치와의 차이를 비교, 보정하여 줌으로써 작업공 간 평가시 보다 정확한 결과를 얻을 수 있도록 하였다. 한국형 전차 작업공간 평가에서는 설계 된 인체 모델과 한국형 전차 주요 구성품의 CAD 모델을 활용하여 각 승무원의 작업역을 분석하였고, 승무원 해치, 주요 조종장치의 운용 적합성, 판넬류 등의 위치 적합성에 대해 분석, 평가하였다. 본 연구를 통해 무기체계를 대상으로 하여 CAD 프로그램을 이용한 Man-Machine Interface에 대한 검토가 이루어 졌으며, 기존의 도면이나, Mock-up, Prototype에 의존하던 작업공간 타당성 검토가 CAD를 이용하여 3차원적으로 이루어 질 수 있는 기반을 마련하였다는데 의의가 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.3
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• pp.42-47
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• 2016

The quality of CAD models affects the efficiency of the product development process. However, it seems that CAD modeling education in colleges simply focuses on the creation of CAD models without considering the quality or the applicability of the models. In this paper, we propose educational modeling approaches to help improve the quality and applicability of CAD models. These methods teach students to create models that include a rich set of information, facilitate downstream applications, and are precisely made with the fewest operations. A survey was carried out with students to validate these approaches.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10a
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• pp.227-230
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• 2000

건설 도면정보의 공유 및 교환은 건설 CALS/EC(Continuous Acquisition & Lifecycle Support /Electronic commerce) 환경의 필수적인 요소이다. 그러나 CAD 시스템의 버전변화와 별도의 한글처리로 인하여 도면정보의 관리 렌 활용에 많은 문제점이 발생하고, 상이한 CAD 시스템간의 파일 교환이 제대로 이루어지지 못하는 등 도면정보 교환을 위한 정보모델의 구축이 절실히 요구되고 있다. 이러한 환경에서 STEP(Standard for the Exchange of Product model data)은 건설 도면정보의 교환 및 공유를 위한 정보모델을 구축함에 있어서 그 활용 가능성이 높다. 본 연구에서는 STEP을 이용하여 건설분야에서 활용 가능한 2차원 도면정보 모델을 개발하고자 한다. 이를 위하여 STEP내의 AP 202를 기반으로, AP 214와 독일의 2차원 도면정보 표준화 프로젝트인 STEP-CDS를 참조하도록 한다. 그리고 실제 개발된 도면정보모델이 기존 CAD 도면 데이터를 제대로 표현할 수 있는지 검증하기 위하여 상용 CAD시스템인 AutoCAD Rl4의 DXF 데이터를 개발된 정보모델로 변환하여 그 결과를 검토하고자 한다. 세부적으로는 DXF 데이터의 도면정보모델로의 변환을 위하여 DXF 구조의 STEP 스키마를 정의한다. 이때 이 스키마와 도면정보모델의 스키마간의 매핑을 위하여 STEP내의 EXPRESS-X를 이용하기로 한다. 또한 도면정보 모델의 데이터의 뷰잉과 브라우징을 위하여 도면정보 뷰어를 개발한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.4
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• pp.397-406
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• 2016

Diverse stakeholders engaged in design, construction, and operation and maintenance of offshore plants typically operate heterogeneous plant 3D CAD systems. Engineering, procurement, and construction (EPC) companies are required to submit plant design result to the owner in the form of a plant 3D CAD model, as specified in the contract. However, because of the limitations of data interface of plant 3D CAD systems, EPC companies frequently perform manual remodeling to fulfill the terms and conditions of the contract. Therefore, comparison should be performed between the source plant 3D CAD model and the remodeled plant 3D CAD model to prove the validity of the remodeled plant 3D CAD model. To automate the comparison process, we have developed a system for quantitatively assessing the similarity of the plant 3D CAD models. This paper presents the architecture and detailed functions of the system. In addition, experimental results using this system are explained.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.30 no.3 s.246
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• pp.219-230
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• 2006

Digital CAD models are one of the most important assets the manufacturer holds. The trend toward concurrent engineering and outsourcing in the distributed development and manufacturing environment has elevated the importance of high quality CAD model and its efficient exchange. But designers have spent a great deal of their time repairing CAD model errors. Most of those poor quality models may be due to designer errors caused by poor or incorrect CAD data generation practices. In this paper, we propose a rule-based approach for healing CAD model errors. The proposed approach focuses on the design history data representation from a commercial CAD model, and the procedural method for building knowledge base to heal CAD model. Through the use of rule-based approach, a CAD model healing system can be implemented, and experiments are carried out on automobile part models.

• The Journal of Society for e-Business Studies
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• v.9 no.4
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• pp.117-136
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• 2004

As the time-to-market gets more important for competitiveness of an enterprise in manufacturing industry, it becomes important to shorten the development cycle of a product. Reuse of existing design models and e-Catalog for components are required for faster product development. To achieve this goal, an electric catalog must provide parametric CAD models since parametric information is indispensable for configuration design. There are difficulties in building up a parametric library of all the necessary combination using a CAD system, since we have too many combinations of components for a product. For example, there are at least 80 million combinations of components on one page of paper catalog of a mold base. To solve this problem, we propose the method of table parametric for the automatic generation of parametric CAD models. Any combination of mold base can be generated by mapping between a classification system of an electric catalog and the design parameters set of the table parametric. We propose how to select parametric models and to construct the design parameters set.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.4
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• pp.375-384
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• 2005

Three dimensional urban models are being increasingly applied for various purposes such as city planning, telecommunication cell planning, traffic analysis, environmental monitoring and disaster management. In recent years, technologies from CAD and GIS are being merged to find optimal solutions in three dimensional modeling of urban buildings. These solutions include modeling of the interior building space as well as its exterior shape visualization. Research and development effort in this area has been performed by scientists and engineers from Computer Graphics, CAD and GIS. Computer Graphics and CAD focussed on precise and efficient visualization, where as GIS emphasized on topology and spatial analysis. Complementary research effort is required for an effective model to serve both visualization and spatial analysis purposes. This study presents an efficient way of using the CAD plans included in the building register documents to reconstruct the internal space of buildings. Topological information was built in the geospatial database and merged with the geometric information of CAD plans. as well as other attributal data from the building register. The GIS network modeling method introduced in this study is expected to enable an effective 3 dimensional spatial analysis of building interior which is developing with increasing complexity and size.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.05a
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• pp.248-249
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• 2019

In the nuclear industry, in order to keep pace with the 4th industrial revolution era, they are trying to improve the construction and maintenance ability by utilizing the technologies such as digital twin and VR/AR from the construction stage. However, the nuclear 3D CAD model, which is used as the base in the latest technology, is heavy due to a large number of facilities per unit space compared to other industrial companies, and it is difficult to directly incorporate the latest technology into the results of CAD programs for design purposes. In this study, in order to improve usability, we tried to lighten the 3D model. First, we analyze the existing nuclear power plant 3D model and draw out the problems and features. Secondly, we derived the factors to consider when we make the 3D CAD models lightweight.