• 한국BIM학회 논문집
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• 제8권2호
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• pp.1-9
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• 2018

Nowadays Building Information Modeling (BIM) is a significant source of sharing project information in the construction industry. This method of sharing the information enhances the project understanding among stakeholders. Modeling of information using BIM is becoming an essential part of many construction projects around the globe. Despite rapid adoption of BIM in construction industry still, some sectors of the industry like earthwork have not yet reaped its full benefits. BIM has brought a paradigm shift through identification and integration of the roles and responsibilities of project participants on a single platform. BIM is a 3D model-based process which provides the insight into the efficient project planning and design. The 3D modeling can also be used significantly for the design of temporary structures in an earthwork project. This paper presents the quantity take-off methodology and parametric modeling technique for creating the temporary structures using 3D BIM process. A case study is conducted to implement the proposed temporary structure family design on a real site project. The study presented is beneficial for the earthwork project stakeholders to extract the relevant information using 3D BIM models in a project. It provides an opportunity to calculate the quantity of material required for a project accurately.

• 한국기계가공학회지
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• 제11권6호
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• pp.62-68
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• 2012

Geometry of a screw fabricated by a turning process determined by the shape of the tool, feed rate of the tool and rotation speed of the spindle. Therefore, computing the exact geometry of the screw is very important to perform a simulation on machining or an evaluation of the workpice quality. In this paper, a new mathematical geometry model of the 3 dimensional screw is fabricated by turning process introduced for the exact geometry computation. Becasue model has a parametric formulation, it is easy to process for a CAD geometry or apply for a machining simulation. Also, it can be applied to process planning because it gives precise machined geometry on whole the 3 dimensional surface of the screw. This paper introduces a new parametric model of a geometry for screw fabricated by turning process. As an application, a simulation software for the 3 dimensional screw surface is developed and evaluated for several manufacturing parameters.

• 대한기계학회논문집
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• 제19권4호
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• pp.1005-1012
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• 1995

This paper proposes a new approach for modeling sweep surfaces. The overall modeling procedure consists of following steps : (1)remeshing the section curves based on the curve lengths ; (2)remeshing the guide curve and the boundary curves based on a given sweeping rule ; (3)obtaining intermediate section curves at the remeshed points of the guide curve by blending the initial section curves ; (4)compensation of the intermediate section curves ; (5)interpolating the initial and intermediate curves using Hermite interpolant. The resulting sweep surface is expressed in a G$^{2}$ bicubic parametric spline surface.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1652-1657
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• 2007

Designer must cope with frequent changes in geometric information of automobile suspension module in the early stage of the design process. The authors developed the PSG(Parametric Set Generator) to create parametric models and to change geometric information concerning the lower arm, which is one of the important parts of the automobile suspension module. CAD models provided from the PSG can be utilized to assess fatigue durability via the FE modeling support system. This system provides easy and fast FE-modeling for a static and durability analysis of the lower arm. The PSG and the FE modeling support system are integrated using the e-engineering framework based on the JADE platform. In this study, a durability analysis as a case study for the lower arm manufactured at H company is performed, and the efficiency obtained is discussed.

• 한국BIM학회 논문집
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• 제7권1호
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• pp.1-8
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• 2017

Aesthetic design guidelines of bridges were developed in many countries. As iconic structures, bridges need to be attractive and durable as they serve many generations. In this paper, a new design process of concrete structures considering 3D shapes and texture was proposed. The 3D design needs to consider function, economy, advanced technology, tradition and local culture. 3D printers enable the combination of artistic design and engineering design for concrete structures. Parametric modeling with iconic design was utilized to produce 3D formworks. As a pilot project, a railway bridge girder was designed and the proposed technologies were applied. Detail requirements to improve constructability and quality of concrete surfaces were derived. From the pilot applications, design guidelines were suggested.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.774-778
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• 1996

Developed in this research is a surface modeling kernel for various CAD/CAM applications. Its internal surface representations are rational parametric polynomials, which are generalizations of nonrational Bezier, Ferguson, Coons and NURBS surface, and are very fast in evaluation. The kernel is designed under the OOP concepts and coded in C++ on PCs. The present implementation of the kernel supports surface construction methods, such as point data interpolation, skinning, sweeping and blending. It also has NURBS conversion routines and offers the IGES and ZES format for geometric information exchange. It includes some geometric processing routines, such as surface/surface intersection, curve/surface intersection, curve projection and so forth. We are continuing to work with the kernel and eventually develop a B-Rep based solid modeler.

• 산업공학
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• 제16권spc호
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• pp.138-143
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• 2003

In this paper, an automated design system for ball-joint parts based on 3-D solid modeler is developed. Parametric modeling and API provided by 3-D solid modeler is engaged to develope the system which consists of four main modules such as : 3-D part modeling, parts assembling, 2-D drafting, and database interfacing modules. The automated design system is implemented on a computer, and shows us that it shorten the design processing time which have taken over 5 hours to only few minutes.

• 한국전산구조공학회논문집
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• 제28권4호
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• pp.393-400
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• 2015

본 연구는 기획단계, 설계단계 및 시공단계에서 사용가능한, 모듈러 강교량 상부구조 정보모델 생성의 효율성을 향상하기 위하여, 파라메트릭 모델링(parametric modeling)을 통해 상부모듈을 생성하고 이들을 조합할 수 있는 방안을 제시하였다. 파라메트릭 모델링을 적용하기 위한 요소 도출을 위하여 상부구조 구성요소 분류를 수행하였고, 분류된 요소를 결합 조건에 따라 13개의 종으로 구분하였다. 또한 모듈러 강교량 공장 제작 단위인 상부모듈의 조합을 통해 안정적인 상부구조 생성을 위한 세 가지 조합조건을 도출하였다. 파라메트릭 모델링을 통한 상부모듈 생성 시 구성요소 형상에 조합조건을 반영하는 변수를 도출하였다. 이를 본 연구에서 개발한 Building Information Model(BIM) 소프트웨어기반의 생성 인터페이스를 활용하여 타입과 변수에 따른 상부모듈 구성요소들을 생성하였다. 이때 생성된 상부모듈에는 상부구조로 조합하기 위한 정보를 반영하였으며, 이를 검증하기 위하여 Industry Foundation Classes(IFC) 기반의 정보모델을 생성하고, 반영한 속성정보를 확인함으로써 상부구조 생성에 활용할 수 있음을 확인하였다.

• 한국진공학회지
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• 제12권1호
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• pp.20-24
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• 2003

Parametric semiconductor model을 이용하여 $In_{\chi}Ga_{1-\ch}As \;(0\leq\chi\leq1)$ 화합물 반도체 박막의 유전함수를 얻었다. Parametric model은 Gaussian-broadened polynomial들의 합으로 임계점에 대한 모델 유전 함수를 묘사하여 InGaAs 화합물의 광학 상수들을 재현할 수 있는 parameterized 함수를 제공하였다. 이러한 parametric 모델을 통하여 임의의 성분비 $\chi$에 대한 파라미터 값들을 얻었고, 이렇게 얻어진 파라미터들로부터 $In_{\chi}Ga_{1-\ch}As \;(0\leq\chi\leq1)$ 화합물 박막의 임의의 성분비에 대한 유전 함수를 얻을 수 있었다.

• Architectural research
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• 제13권3호
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• pp.11-18
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• 2011

With the rapid development of computer technology and ongoing destruction of traditional buildings, more and more attention is paid to digital methods for the design and preservation of traditional buildings. Unlike 2D methods, Building Information Modeling (BIM) provides an object-oriented and parametric digital representation way for traditional building components. However, one of the main limitations currently is that parametric information cannot be exchanged between BIM software packages. Therefore each kind of software must have their own parametric library which causes extensive works. In this research, the authors developed an open BIM-based library using an XML parametric approach to solve the above problems, represented traditional components according to an XML schema, and parametrically implemented these XML files in a browser which can be accessed by users for their easy component edit and selection. And then based on the XML file of one component, implemented an Add-on in ArchiCAD for users to parametrically edit and directly utilize. Thus based on these XML files, a browser for users' view and selection purpose and an add-on for users' application purpose were developed. Future research will focus on implementing these XML files in other BIM tools like Revit and Digital Project. If the whole library was to be completed based on this XML approach, an open BIM-based library would be established that all kinds of BIM software users could apply this parametric library for easy modeling of traditional houses.