• 한국CDE학회논문집
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• 제11권3호
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• pp.164-171
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• 2006

As collaborative design and configuration design are of increasing importance in product development, it becomes essential to exchange the feature and parametric CAD models among participants. A history-based parametric method has been proposed and implemented. But each translator which exchanges the feature and parametric information tends to be heavy because to implement duplicated functions such as the identification of the selected geometries, mapping between features which have different attributes. Furthermore. because the history-based parametric translator uses the procedural model as the neutral format, which is the XML macro file, the history-based parametric translators need a geometric modeling kernel to generate an internal explicit geometric model. To ease the problem, we implemented a shared integration platform, the TransCAD. The TransCAD separates translators from the XML macro files. The translators for various CAD systems need to communicate with only the TransCAD. To support the communication with the TransCAD, we exposed the functions of the TransCAD by using the Automation APIs, which is developed by Microsoft. The Automation APIs of the TransCAD consist of the part modeling functions, the data extraction functions, and the utility functions. Each translator uses these functions to translate a parametric CAD model from the sending CAD system into the XML format, or from the in format into the model of the receiving CAD system This paper introduces what the TransCAD is and how it works for the exchange of the feature and parametric models.

• 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.

• 한국CDE학회논문집
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• 제11권1호
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• pp.27-40
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• 2006

The exchange of parameterized feature-based CAD models is important for product data sharing among different organizations and automation systems. The role of feature-based modeling is to gonerate the shape of product and capture design intends In a CAD system. A feature is generated by referring to topological entities in a solid. Identifying referenced topological entities of a feature is essential for exchanging feature-based CAD models through a neutral format. If the CAD data contains the modification history in addition to the construction history, a matching mechanism is also required to find the same entity in the new model (post-edit model) corresponding to the entity in the old model (preedit model). This problem is known as the persistent naming problem. There are additional problems arising from the exchange of parameterized feature-based CAD models. Authors have analyzed previous studies with regard to persistent naming and characteristics for the exchange of parameterized feature-based CAD models, and propose a solution to the persistent naming problem. This solution is comprised of two parts: (a) naming of topological entities based on the object spore information (OSI) and secondary name (SN); and (b) name matching under the proposed naming.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.504-508
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• 2003

최근 공정관리와 원가관리의 중요도 인식에 기인하여 공정/원가 통합관리 및 공정정보와 3차원 설계정보를 연계할 4차원 설계 정보 연구가 활성화되고 있다. 공정과 원가를 통합할 수 있는 EVMS의 관리적 효과와 도형정보와 공정관리를 통합을 통하여 일정관리의 편의 및 효율을 극대화 하는 4차원 CAD(4D CAD)의 시각적 효과를 통합하는 4D-EVMS는 프로젝트 관리의 중요한 도구가 될 수 있다. 이러한 맥락에서, 본 연구의 목적은 발주자 공정/원가 총합관리를 위한 기본요건 도출 및 구현방안 제시에 있다. 이러한 연구의 결과물은 발주자 공정/원가관리의 업무효율 증대뿐만 아니라 실적자료 축적 및 홍보 관점에서도 기대효과를 가진 수 있을 것으로 판단된다.

• 한국CDE학회논문집
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• 제11권3호
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• pp.183-196
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• 2006

A new operation strategy. which can guarantee the data consistency of engineering information among the various intelligent information systems, is presented for engineering information of bridges, and construction methodology of integrated database is developed to support the strategy. The two core standard techniques are adopted to construct the integrated database. One is the Standard for the Exchange of Product Model Data (STEP) for CAD/CAE information and the other is the Extensible Markup Language(XML) for engineering document information. The former enabler structural engineers to handle the structural details with three-dimensional geometry-based information of bridges, and ACIS solid modeling kernel is employed to develop AutoCAD based application modules. The latter can make document files into data type for web-based application modules which assist end-users to search and retrieve engineering document data. In addition, relaying algorithm is developed to integrate the two different information, e.g. CAD/CAE information and engineering document information. The pilot application modules are also developed, and a case study subjected to the Han-Nam bridge is presented at the end of the paper to illustrate the use of the developed application modules.

• 한국전산구조공학회논문집
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• 제22권2호
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• pp.127-134
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• 2009

개발단계에 있어서 필수적인 성계 프로세스인 CAD 및 CAE 시스템은 각각 개별적으로 발전되어 왔다. 더구나 제품개발에 있어서 부서나 기업간의 CAD 또는 CAE 시스템의 이질성이나 제품 데이터 표현방법의 차이로 인해 이를 통합하기 위한 부가적인 비용과 개발기간이 발생하기도 한다. 따라서 설계과정에서의 협업을 성공적으로 수행하기 위해서는 제품 개발 초기 단계에서부터 이질적인 CAD와 CAE 등의 관련 시스템을 유기적으로 통합 관리할 수 있어야 한다. 따라서 본 연구에서는 보다 효과적으로 통합관리하고 설계 및 해석도구들의 연계사용을 지원하기 위해 최적설계를 포함한 설계 및 해서시스템을 통합화하는 기법을 제안하고, 보강판 예제를 통해 CATIA를 이용한 CAD와 CAE간의 데이터 전환의 문제점을 극복하는 것을 보여줌으로서 이 기법의 타당성을 보여주고자 한다. 이와 아울러 최적화 과정을 수행함에 있어서 CAE 프로세스는 구조 최적화 과정에 있어서 하나의 필수적인 부분임을 확인할 수 있었다.

• Journal of Biosystems Engineering
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• 제16권3호
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• pp.228-238
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• 1991

Cam plays very important roles due to continuous requirement for the high-speed and automation of the machinery. A large number of studies of cam curve were carried out by many researchers, and CNC milling and machining center for manufacturing cam have been widely used recently. The purpose of this study was to develop a CAD/CAM system for cam using QuickBasic language in 16-bit PC for application of cam design and manufacturing. Results obtained were as follows : 1. It was possible to input data by entering cam angle and its corresponding R, from 0 to 360 deg. of cam angle. The tediousness at entering data was minimized because of the same data format for both cylindrical cam and disc cam, and free format used for data file. 2. It was possible to design cam by choosing only the number of cam curve because of developing the CAD/CAM program with dimensionless method of cam curves including widely used 19 kinds. After selecting the number of the cam curve, the CAD/CAM system automatically shows the characteristics of cam motion enough to help a designer to decide : displacement, velocity, acceleration and jerk. 3. It was possible to execute, in an efficient way, both the cam profile synthesis and the generation of NC program for CNC machining center by using the input data. 4. This NC program generated by the CAD/CAM system developed here, was evaluated as positive in relation with actual manufacturing experiments and thought to be useful in its application without any modification. It can be said that this CAD/CAM system could be used by the beginners to design and manufacture the cam automatically as the system consists of very simple dialogue methods. In addition, self-developed QuickBasic would be would used as a basic tool for further stuides in this area of research, together with application.

• 농업과학연구
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• 제22권1호
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• pp.11-23
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• 1995

The CAD/CAM system for the manufacturing automation is the newest technology in mechanical engineering area and becomes the important research subject nowadays. Most of all hardwares and softwares for the CAD/CAM system used in the our manufacturing companies such as automobile company are developed by the foreign country and the purchasing price of them is very expensive but their applicability to a certain area is very limited. This study was conducted to develope a CAD/CAM system for the design and the automatic manufacturing of the iron pattern shaped with 3 - dimensional free curved surface, and to test its applicability to the design and the manufacturing of the rotary blade. The results obtained from the study are as follow; 1. The CAD system which can process graphic procedures from the free curved surface shaped data was developed with personal computer. 2. The CAM main program was developed. This main program could produce CL data from CAD data file by checking the tool interference according to the cutting mode. 3. The sub. program which can simulate the tool trace from the CL data was developed. 4. The post processor for the Deckel FP2NC NC milling machine from CL data file was developed and the sub program could transmit NC program through modem to NC milling machine was developed. 5. The developed CAM system seemed to be applicable to any other system. Because the measuring results of the cross sectional thickness of the plastic model from the manufacturing iron pattern by the system showed that this system could properly check the tool interference. 6. In took 75~90 hours to manufacture two iron patterns of rotary blade. For the sake of convenience in applying to the other systems, this system was developed in BASIC and FORTRAN computer language and minimum portion of machine language as possible.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.744-747
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• 2008

설계도면을 중심으로 산출되는 물량정보는 건설 프로젝트 생애주기 동안에 프로젝트 참여주체들에게 비용과 관련한 의사결정에 결정적인 역할을 하는 매우 중요한 정보이다. 이러한 정보를 생성하는 물량산출 업무가 수작업에 많이 의존하다보니 작업자의 실수에 의한 오류가 빈번하게 발생하고, 견적담당자의 노하우에 따라 물량의 차이가 존재하기도 한다. 또한, 설계변경에 의해서 물량산출을 위한 재작업에 들어가게 될 경우 모든 물량산출 프로세스를 다시 거쳐야 하는 문제가 있다. 이러한 제반 문제는 견적자동화를 통해 물량산출의 정확성 확보 및 설계변경 시 요구되는 물량산출의 대응력에 대한 요구를 증대시키고 있으며, 최근 3D CAD Modeler에서 생성된 3D CAD 모델을 기반으로 견적업무프로세스를 자동화하려는 연구가 다양한 관점에서 시도되고 있다. 그러나 기존 연구에서는 특정 3D CAD Modeler를 중심으로 한 견적자동화에 대한 연구로 다양한 3D CAD Modeler에서 생성된 3D CAD 모델로부터 물량정보를 취득하기 위한 공통체계 구축하고 이를 기반으로 BIM기반 견적자동화를 이루는 데 한계를 가지고 있다. 따라서 본 연구에서는 이러한 BIM기반 견적자동화 체계구축을 위한 기반 연구로 다양한 3D CAD Modeler로부터 물량산출을 자동화하기 위해 Modeler가 내부적으로 가지고 있는 Quantity Data Type을 추출하고, 이를 분석 및 검증할 수 있는 체계를 개발하였다.

• 정보처리학회논문지A
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• 제18A권3호
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• pp.81-92
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• 2011

제품수명주기(Product life cycle) 중 설계단계에서 생성되는 3차원 CAD 데이터를 다양한 단계에서 활용하고자하는 노력이 관련 산업 분야에서 이루어져 왔다. 그러나 3차원 CAD 데이터는 데이터 처리를 위한 많은 컴퓨팅 자원을 요구하고 설계지식이 유출될 수 있는 위험이 있으며, 라이선스 비용이 따르기 때문에 원격지 협업 검토나 마케팅, 전자 기술 매뉴얼과 같은 서비스단계에서 활용하기에 적합하지 않다. 이러한 문제점들을 해결하기 위해 경량화된 가시화 파일형식과 이를 적용한 응용시스템에 대한 다양한 연구가 수행되었으나, 제안된 경량화 파일형식들은 대부분 기업 혹은 기관의 독자적인 형식으로 서로 간에 공유될 수 없으며, 제품의 형상 정보와 함께 제품구조 정보를 표현하는데 한계점을 보이고 있다. 본 연구에서는 이를 해결하기 위하여 웹 기반 3차원 그래픽 표준인 X3D를 활용하여 제품의 형상 정보뿐만 아니라 구조 정보의 표현이 가능한 X3D 기반 데이터 집합인 prod-X3D(Enhanced X3D Dataset for Web-based Visualization of 3D CAD Product Model)를 정의하고, 3차원 CAD 데이터로부터의 변환 기법을 제안한다.