• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1676-1682
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• 2008

The vertical curve of railway is installed in changing point where the gradient is more than a certain degree to ensure safe operation of train and comfort of passengers. As a result of CAD work with 3D coordination by using the existing equation, it was found that the simple equation about vertical curve installation suggested in the surveying engineering or railway regulations did not reflect theoretical curvature of circular curve in a case of steep grade and large vertical radius. In this study, for derive precision equation and transition curve about vertical curve, gradient parameters, equation of circles and transition curve equation were used, and it was verified by CAD that the derived equation is exactly satisfied with parameters of geometrical circular and transition curve. This equation could be used to provide more smoothing operation of train and comfort of passengers on vertical curves, especially in case that railway requires precision vertical alignment of track such as super high-speed railway, LRT or Maglev system.

• 제어로봇시스템학회논문지
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• 제17권3호
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• pp.254-257
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• 2011

This study was performed to development a dental three-dimensional laser scanning system and measure the accuracy of new adjustable lower dental impression trays. Multiple impressions of a resin master model were made with custom, stock and new adjustable trays and vinyl polysiloxane impression material. The lower master model and resulting cast were compared using an dental scanning system. Each 3D image was superimposed onto the lower master model image and analyzed with custom software. Multiple measurements of the lower master model and casts were analyzed to determine the accuracy of tray types.

• 제어로봇시스템학회논문지
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• 제16권3호
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• pp.300-304
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• 2010

This study was performed to development a dental three-dimensional laser scanning system and measure the accuracy of new adjustable upper dental impression tray. The metal stock, individual, and new adjustable stock trays were used for 30 stone casts(10 casts each) duplicated a resin master model of maxilla. The dental stone was poured in a vinyl polysiloxane impressions and allowed to set for on hour. The master model and the duplicated casts were digitized using an dental scanning system. The distance between the reference points were measured and analyzed on the graphic image of 3D graphic software of CATIA. The statistical significance of the differences between the groups was determined by a two-way ANOVA. There were no significant differences between the accuracies of the adjustable stock tray and the master model except only anterior arch width on the upper arch. The adjustable upper stock tray showed clinically acceptable accuracies of the study cast produced by them.

• 한국압력기기공학회 논문집
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• 제4권2호
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• pp.57-61
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• 2008

During the period of retubing work for the licensing renewal, the fuel channels, calandria tubes and feeders of CANDU Reactors will be replaced, and calandria visual examination will be performed. This period is a unique opportunity to inspect the inside of the calandria. The visual inspection for the calandria vessel and its internals of Wolsong NPP is scheduled for confirming the calandria integrity. The first visual inspection for the calandria is planned in Pt. Lepreau led by AECL. The visual inspection for Wolsong NPP, led by NETEC(Nuclear Engineering & Technology Institute) of KHNP, will employ 3D laser scanner and 3D CAD Mock-up for the first time in the world, in addition to a conventional video camera. The inspection system is composed of a robot with the 3D laser scanner, a video camera and a hardness meter.

• 지구물리와물리탐사
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• 제6권4호
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• pp.195-198
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• 2003

본 연구에서는 주거지에서 발생한 지반침하의 원인규명과 대책수립을 위해 다양하게 획득된 지반조사 자료 중 지구물리탐사 자료와 지질자료를 조사자 등 사용자가 쉽게 비교할 수 있도록 보조하는 3차원 가시화 프로그램을 개발하였다. 프로그램은 사용자의 편의성을 고려해 Windows 운영체제에서 OpenGL을 사용하여 Visual C++로 개발하였다. 본 연구에서 개발된 프로그램은 사용자에게 필요한 기능 위주로 개발되었기 때문에 편리하고 소용량이며 GIS나 CAD 등을 모르는 사용자도 쉽게 사용할 수 있는 장점이 있다. 개발된 프로그램을 통해 지반침하지역 지반조사 자료 중 시추자료와 전기비저항 토모그래피 자료를 3차원으로 가시화 시켜 현장 적용성을 살펴보았으며, 그 결과 사용자에게 지하구조 파악을 위한 두 자료의 상호비교가 용이해져 지하구조 해석에 도움을 줄 수 있었다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.286-290
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• 2003

Accurate acquisition of surface geometries such as machined surfaces, biological surfaces, and deformed parts have been very important technique in scientific study and engineering, expecially for system design, manufacturing and inspection. Two camera method keeps accuracy more than double than mechanical method. In this paper, we describe the processes surface data of teeth for automatic processing, transformation that changes to coping data of possible numeric data form and processed inlay teeth. As the result of the Inlay manufacture, which can process with high resolution, therefore we construct the automatic processing system that depends on manual

• 한국정밀공학회지
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• 제19권8호
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• pp.194-202
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• 2002

Die design of bonnet drawing is composed of upper die, lower die and blank holder. It has been performed by checked and re-design method, which cause economic and financial loss. Nowadays, CAD/CAM system is excellent, but application is low. Therefore, in specific item, drawing die of bonnet outer draw by 3-D lay-out. In this study purpose, Bonnet drawing die is designed rapidly, correctly. It's method that shape modify to resemble. This purpose lead to 3-D Lay-Out. It is to react the standard die. In rule relation, input data change all of the shape.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 춘계학술대회 논문집
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• pp.441-447
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• 2003

In the study, we described on the 3D solid model be made on the AutoCAD haved an effect on the deviation of form as RP manufactures the facetres. The STL file improved the deviation of form as the facetres value but the deviation of form have the difference a little as the RP system. In result, we ruled the correlation with the 3D solid model and the RP sample manufacturing, with manufacture RP sample according to facetres value in complex shape. And we developed the program which recombination the STL file that we make use of the AutoLISP.

• 한국정밀공학회지
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• 제16권4호통권97호
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• pp.102-109
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• 1999

Reverse engineering is a technique that helps designers to quickly generate computer interpretable data from existing physical objects. It can be used for generating CAD data from a mechanical part of high precision, or generating computer animation characters from physical mock-ups. We developed a low precision reverse engineering system that is composed of surface/solid generation software and a contact type commercial 3D digitizer. A unique point sampling procedure has been devised to easily form solid topology from the sampled data. It was also shown that STL data for rapid prototyping was successfully generated from the solid.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2004년도 제5회 정기학술발표대회 논문집
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• pp.349-352
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• 2004

4D-CAD 시스템에 대한 공사관리 도구로서의 활용가능성이 제기되기 시작한 것은 1990년대 후반이후의 일이다. 현재까지 몇몇 4D 시스템틀이 개발 $\cdot$ 적용되고는 있으나, 상용화 및 보편화를 위한 해결되어야 할 다수의 문제점들을 가지고 있다. 특히 자연지형과 계획시설물의 형상을 함께 표현하여야 하는 토목시설물에 대한 4D 시스템 구현에 있어서는 더 많은 해결되어야할 과제들이 존재하고 있다. 토목시설물에 대한 4D 시스템 구현에 있어서의 주요문제점 중 하나는 계획 시설물의 3차원 형상을 그와 접하고 있는 자연지형과 함께 표현할 수 있는 3D 모델을 생성하는 작업량의 방대성이다. 현재까지 이러한 작업은 대부분 수작업으로 진행되어 왔으나, 본 연구에서는 수치지도로부터 얻어지는 지형 삼각망과 계획단면으로부터 생성될 수 있는 계획삼각망을 자동으로 합성할 수 있는 방법론을 제안하며, 더 나아가 양삼각망 간의 합성과정을 생략하고 4D 모델을 구현학 수 있는 방안으로서 VRML의 멀티텍스처링 (multi-texturing) 기법을 적용하는 방법론을 각각 제안하고, 실제 4D 시스템의 구성기능으로서 적용하였다. 이러한 3D 모델 생성의 간편화 기법은 토목시설물에 대한 4D 시스템의 대중화 및 보편화를 위한 핵심기술로서 활용될 수 있을 것으로 판단된다.