• Proceedings of the Computational Structural Engineering Institute Conference
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• 2004.10a
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• pp.371-376
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• 2004

This study presents a way to generate and manage engineering information by applying steel bridge information model with 3D shape to existing application program. ACIS solid modeling kernel is used to visualize 3D geometric shape of steel bridge on the AutoCAD program. The shape information of 3D solid model can be connected to structural design information of steel bridge by an application module based on information model. The application module for manipulating steel bridge information can be easily developed by ObjectARX programming library supporting functional expansion of AutoCAD program. End-users can use the application module without any additional environmental setup on the AutoCAD. Thus this study facilitates information management of steel bridge by using ACIS solid modeler and ISO/STEP methodology.

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.1141-1146
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• 2003

We have developed the three-dimensional simulation tool for the design of deflection yoke. This tool consists of a modeler, a solver and a post-processor. The modeler easily makes models of Deflection Yoke (DY) and ferrite core (Circle, RAC and RTC) by the parameters and supports several element types (line, surface and quadrilateral). The solver calculates charge density and magnetic field of DY by boundary element method (BEM). We can simply evaluate misconvergence, distortion and inductance of DY in the post-processor, so we apply this simulation tool to 32" rectangular deflection yoke. We can conveniently implement the efficient development of DY in the future.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1581-1584
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• 2003

This paper proposed efficient manufacturing system using OMM(on-machine measurement) system and OMM operating S/W based 3D modeler. A Developed program connected tool machine with RS232C. It is composed two operating system that touch probe operating and laser displacement sensor operating system. A program for touch probe possible measure considered inspection feature and CAD data. The laser operating program is used inspection for profile. very small hole using installed feature data. This system is applied manufacturing line of mold(cavity, core) also verification of efficiency manufacturing process that production, reduction machining error of each process

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1999.10a
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• pp.544-548
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• 1999

This study is about development of Feature-based Solid Modeling system in integrated CAD/CAM environment. Parasolid modeling kernel and HOOPS/3D graphics library was used to develop this system in PC level. System feature library was defined using both procedural and declarative approach method. The raw stock is created by boolean operator using design primitives, and a part is designed that pre-defined feature is removed from the raw stock. This method is called "DSG(Destructive Solid Geometry)" and basic constructive operator of this system. This is not complete system and only the first step to develop Feature-based Solid Modeling System using Parasolid. We will add more powerful functionality and flexible GUI in Windows.n Windows.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.6
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• pp.1372-1380
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• 1993

Surface trimming is an essential function in a surface modeler for representing multi-boundary surfaces, blended surfaces, and surfaces with islands or pockets. A procedure and a data structure for designing trimmed surfaces were developed. For generating a trimmed surface, edges (curves difined on a surface) are generated and trimmed first. Then the trimmed edges are selected sequentially to form a closed loop. The data of supporting surface, surface on which the trimmed surface is defined, and bounding edges are stored and used for the application such as NC programming, robot programming, graphic display, etc.

• Korean Journal of Computational Design and Engineering
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• v.3 no.3
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• pp.154-160
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• 1998

In this study, we implement the prototype modeler with non-manifold data structure using Open Inventor. In these days, Open Inventor is a popular tool for computer graphics applications, even though Open Inventor could not store topological information including a non-manifold data structure which can represent an incomplete three dimensional shape such as a wireframe and a dangling surface during designing. Using Open Inventor, our modeler can handle a non-manifold model whose data structure is based on the radial edge data structure. A model editor is also implemented as an application which can construct a non-manifold model from two dimensional editing.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.173-176
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• 2001

In this study, we designed a virtual gallery using VRML authoring tool. With this system, we expect to provide a realistic and interactive environment where students can appreciate artistic work in their learning processes. Our system is implemented with several methods such as panorama images and 3D object modules with Photo Vista, Object Modeler and Reality Studio. We currently investigate how this virtual gallery can affect students aesthetic aspects with the intended realistic appreciation In their art education processes. In the following section, we describes how we implemented our virtual gallery with vrml authoring tools.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2003.12a
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• pp.207-211
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• 2003

In this study, the geometric modeling has been conducted for a new model of 12 inch hot-cold chuck using three-dimensional solid modeler, SolidWorks. Then, the heat transfer analysis and the thermal deformation analysis using FEM have been performed. The results of the analysis show the temperature distribution and the deformed shape of a new model of 12 inch hot-cold chuck. The evaluation for the surface flatness of a new model has been performed based on the deformed shape obtained from ANSYS.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.05a
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• pp.92-97
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• 2002

자성체의 물성적인 성질에 바탕을 둔 Preisach 모델링은 히스테리시스 현상을 수치모사 하기 위한 방법으로 뛰어난 결과를 보여왔다. 하지만 Preisach 모델링은 그 계산과정에서 수렴의 어려움이 존재해 결과 값을 계산하지 못하는 경우가 발생하는 문제를 발생시켜왔었다. 본 논문에서는 Preisach 모델링을 프로그램하는데 있어서 기존에 발생했던 수렴의 문제점과 그 문제점을 해결하기 위한 보다 낳은 프로그램 기법들을 제시하였다. 이 방법은 기존 모델링 기법과 유사한 메모리를 사용하면서 수렴에 있어 향상된 결과를 얻을 수 있었다. 또한 Preisach 모델러를 개발하는 과정에 발생하는 Tracing 모델들을 도식화하여 Preisach 모델링에 대한 이해를 돕고자 하였다.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.144-146
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• 2004

송전선로 주변의 전자계 노출은 소아들의 암 발생/사망과 성인의 암 등 여러 가지 질병 발생 가능성이 항상 있으므로 전자계 노출을 장기간 계속적으로 받고 있는 환경을 관찰하는 것이 가장 중요하다. 따라서 본 연구에서는 이에 대한 연구기반을 형성하기 위해 송전 선로의 모델과 현장 실측을 통해 송전선로 자계치를 계산하여 시뮬레이션 하고자한다. 시뮬레이션을 통해 산출된 자계치를 이용하여 최근 효과적인 자계 저감책으로 보고되고 있는 수동루프에 의한 자계저감효과를 검토하고자 한다. 입력된 데이터는 765kV 실 송전선로를 모델로 사용하였으며, 자계의 계산 및 수동 루프에 의한 자계 저감 효과를 알아보기 위해서 미국 EPRI에서 개발한 자계 계산 전용 프로그램인 EMF Modeler를 이용하였다. 먼저 송전선로에 의해 발생되는 자계의 원리를 서술하였으며, 수동 루프를 통한 자계 감소 정도를 수식으로 유도하였고, EMF Modeler를 통하여 송전선 주변의 자계 분포 및 수통루프에 의한 자계 저감 효과를 각각 확인하였다.