• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2007년 추계학술발표대회 개요집
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• pp.67-69
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• 2007

Laser welding technology for automobile body is studied. Laser system, robot and seam tracking system are used for 3D laser welding system. The laser system is used 4kW Nd:YAG laser(HL4006D) of Trumpf and the robot system is used IRB6400R of ABB. The seam tracking system is SMRT-20LS of ServoRobot. The welding joints of steel plate are butt and lap joint. The 3 dimensional laser welding for non-linear pipe welding line is performed.

• 한국정밀공학회지
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• 제18권9호
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• pp.61-70
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• 2001

This paper introduces a new digitization method with sensor fusion for shape measurement in reverse engineering. Digitization can be classified into contact and non-contact type according to the measurement devices. Important thing in digitization is speed and accuracy. The former is excellent in speed and the latter is good for accuracy. Sensor fusion in digitization intends to incorporate the merits of both types so that the system can be automatized. Firstly, non-contact sensor with vision system acquires coarse 3D point data rapidly. This process is needed to identify and loco]ice the object located at unknown position on the table. Secondly, accurate 3D point data can be automatically obtained using scanning probe based on the previously measured coarse 3D point data. In the research, a great number of measuring points of equi-distance were instructed along the line acquired by the vision system. Finally, the digitized 3D point data are approximated to the rational B-spline surface equation, and the free-formed surface information can be transferred to a commercial CAD/CAM system via IGES translation in order to machine the modeled geometric shape.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.85-88
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• 2002

Until recently, there have been fundamental changes in many fields of industries. Especially, the mass-production is being changed into mass-customization. In order to construct a 3D e-catalog system far the utilization of mass-customization, there are several matters to consider. Setting realistic 3D image should be effective fur providing the customers with the product information with reality and raising their interest. This study explains the whole process to convert CAD data formed from the production activities into VRML data used in virtual reality environment. Examples are given and discussed to validate the proposed activity.

• 한국CDE학회논문집
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• 제1권3호
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• pp.203-214
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• 1996

An information sharing system, namely World Design View, is developed for browsing product design data on the World Wide Web environment. For the last few years information sharing has been rapidly emerging as an important research issue in the areas of concurrent engineering, product data management, virtual manufacturing, and so on. Since we are mainly concerned with product development, the key information that needs be communicated and shared is product data. The developed system puts the major advantages of STEP, OODB, and VRML together. The STEP standard provides a consistent data exchange format and application interfaces among different CAD/CAM systems. OODB is efficient and effective in dealing with complex data structures often found in engineering applications. Virtual worlds for 3-D product models can be created by VRML which is networked via the global Internet and hyperlinked with WWW. The World Design View system can support for members of virtual design teams, possibly distributed all over the world, to share 3-D shape information quickly and easily.

• International Journal of Precision Engineering and Manufacturing
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• 제2권3호
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• pp.27-33
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• 2001

The aim of the present work is to propose a model for Computer Aided programming of numerical Control lathe. This model is based on the concept by features. It has been developed in an Artificial Intelligence environment, that offers a rapidity as well as a precision for NC code elaboration. In this study a pre-processor has been elaborated to study the geometry of turning workpiece. This pre-processor is a hybrid system which combine a module of design by features and a module of features recognition for a piece provided from an other CAD software. Then, we have conceived a processor that is the heart of the CAD/CAM software. The main functions are to study the fixture of the workpiece, to choose automatically manufacturing cycles, to choose automatically cutting tools (the most relevant), to simulate tool path of manufacturing and calculate cutting conditions, end to elaborate a typical manufacturing process. Finally, the system generates the NC program from information delivered by the processor.

• 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.

• 수산해양기술연구
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• 제30권1호
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• pp.53-63
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• 1994

1) 강소성 유한 요소법 프로그램 RDHPSC는 2단헤딩 가공에 있어서의 신뢰 할 수 있는 해석수단이다. 2) RDHPSC에 의한 2단헤딩의 해석은 2단헤딩가공에서의 최적 가공 조건의 결정에 유용한 정보를 제공할 수 있다. 3) 2단헤딩 가공중의 금속흐름을 수치해석에서의 격자 변형에 의해 관찰될 수 있다. 4) 2단헤딩 가공중의 표면 결함의 발생가능성은 수치해석 결과에서 원수방향응력과 계수 D를 관찰함으로서 탐색되어질 수 있다. 5) 2단헤딩가공중에 있어서의 내부결함 발생가능성은 수치해석의 격차 변형을 통하여 알 수 있다. 6) 마무리 가공금형 수명에 대한 최적가공조건은 수치해석에서의 접촉압력을 조사하여 얻을 수 있다.(이 논문의 결론부분임)

• International journal of advanced smart convergence
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• 제6권1호
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• pp.9-17
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• 2017

Recent development in virtual and augmented reality increases the demand for content in many different fields. One of the fast ways to create content for VR is 3D modeling of real objects. In this paper we propose a system to reconstruct three-dimensional models of real objects from the set of two-dimensional images under the assumption that the subject does not has distinct features. We explicitly consider an object that is made of one or more surfaces and radiant constant energy isotropically. We design a low cost portable multi camera rig system that is capable of capturing images simultaneously from all cameras. In order to evaluate the performance of the proposed system, comparison is made between 3D model and a CAD model. A simple algorithm is also proposed to acquire original texture or color of the subject. Using best pattern found after the experiments, 3D model of the Pyeongchang Olympic Mascot "Soohorang" is created to use as VR content.

• International Journal of Ocean System Engineering
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• 제2권4호
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• pp.214-222
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• 2012

The shipbuilding process is changing due to changes in the development environment and technological requirements for military ships. This would also hold true for a submarine, because its shipbuilding process includes complicated design and construction conditions. System improvement efforts for the design and construction of military ships have continued with the goal of overcoming these conditions. At present, the Korea Navy is developing a 3,000 ton-class Korean type submarine, and its design is progressing by the introduction of a full 3D-ship CAD system. Although the 3D modeling system was introduced for effective design realization through the introduction of collaborative design and active utilization of M&S (modeling and simulation), the introduction effects are not yet generally obvious, according to the characteristics of ship design. The present paper discusses the collaborative environment for developing a submarine to enhance this. This paper proposes the architecture and data structure of a system for realizing collaborative design and discusses a case system developed on the basis of this.

• 대한조선학회논문집
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• 제36권1호
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• pp.99-108
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• 1999

초고층강제어초(VEry High-rise Steel Artificial Reef, VEHSAR)의 형상 표현과 해석을 위해서 3차원 모델링 프로그램을 Windows 95(또는 Windows NT) 환경하에서 MFC(Microsoft Foundation Class)를 기반으로 한 Visual C++로 개발하였다. 컴퓨터를 통해 미리 초고층 강제어초 건조를 실제와 같이 구현해 봄으로써 문제점의 사전 예측 및 대책 수립 등을 가능케 하는 저비용 고효율의 일관설계시스템을 구축하는 것을 목표로 하는 이 프로그램은 객체지향프로그램 기법과 CAD/CAM기술의 도입으로 생산성 향상이 기대되며, OpenGL이라는 그래픽 라이브러리를 도입하여 좀더 빠른 고화질의 3차원 그래픽을 화면상에 나타나게 할 수 있다.