• Title/Summary/Keyword: 2-D model

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Development of IFC Model Extension and Drawing Representation Expression System for nD Model-Based Transposition of Complex Engineering Products and Services (복합 시설물의 nD 모델 호환을 위한 IFC 모델 확장개발 및 도면 생성 표현 체계에 관한 기초연구)

  • Kim, In-Han
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.6
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    • pp.393-402
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    • 2006
  • The purpose of this study is to develop mechanisms of nD model-based design by the combination of 2D drawing standards and 3D building models from the current 2D and text-based design. The aim of this study can be archived by defining the 2D model extension definitions for the IFC model development and harmonizing existing 2D standards. The paper examines 1) 3D Representation of Building Element and Building Services element, and 2D Model extension of IFC2X.2, 2) Basic development of additional 2D element that should be added to IFC model, and 3) mapping method between current 2D standard and IFC2.X2. Following this approach, the interoperability problem between 3D model and 2D drawing can be solved and finally an extended data model could be developed.

2D Flat Pattern Development Using Simplified 3D Torso Model (3D 동체 모형을 이용한 2D 전개 패턴 연구)

  • Kim, Myoung-Su;Hong, Kyung-Hi
    • Journal of the Ergonomics Society of Korea
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    • v.24 no.2
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    • pp.85-91
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    • 2005
  • To understand the basic relationship between 3D curved surface model and 2D pattern, simplified torso model was generated by commercial CAD program (IDEAS). 3D torso model was then divided into different blocks and unfolded into a flat pattern as in ordinary works of clothing item design. As results, 2D pattern development of different part of 3D torso model was attempted and analyzed mathematically. It was found that different height, radius and tangent slope of 3D blocks resulted in different 2D pattern. The relationships between the shape parameters of 3D torso blocks and those of 2D patterns were analyzed using regression equations. Direct way of drawing a 2D pattern of corresponding 3D torso block was also illustrated for the convenience of pattern making using conventional measurements of upper/ lower radii and height of 3D torso block.

Harmonization of IFC 3D Building Model Standards and ISO/STEP AP202 Drawing Standards for 2D Shape Data Representation (IFC 3차원 건축모델표준과 ISO/STEP AP202도면표준의 2차원 형상정보 연계방안)

  • Won, Ji-Sun;Lim, Kyoung-Il;Kim, Seong-Sig
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.6
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    • pp.429-439
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    • 2006
  • The purpose of this study is to support the integration from current 2D drawing-based design to future 3D model-based design. In this paper, an important theme is the combination between the STEP-based 2D drawing standards (i.e., AP202) and the IFC-based 3D building model standards. To achieve the purpose, two methodologies are proposed as follows: the development of IFC extension model for the 2D shape data representation by harmonizing ISO/STEP AP202; and the development of mapping solution between IFC 2D extension model and KOSDIC by constructing the exchange scenario for 2D shape data representation. It is expected that the proposed IFC2X2 2D extension model and mapping solution will offer the basis of development of the integrated standards model in AEC industry.

Generation of 3D STEP Model from 2D Drawings Using Feature Definition of Ship Structure (선체구조 특징형상 정의에 의한 2D 도면에서 3D STEP 선체 모델의 생성)

  • 황호진;한순흥;김용대
    • Korean Journal of Computational Design and Engineering
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    • v.8 no.2
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    • pp.122-132
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    • 2003
  • STEP AP218 has a standard schema to represent the structural model of a midship section. While it helps to exchange ship structural models among heterogeneous automation systems, most shipyards and classification societies still exchange information using 2D paper drawings. We propose a feature parameter input method to generate a 3D STEP model of a ship structure from 2D drawings. We have analyzed the ship structure information contained in 2D drawings and have defined a data model to express the contents of the drawing. We also developed a QUI for the feature parameter input. To translate 2D information extracted from the drawing into a STEP AP2l8 model, we have developed a shape generation library, and generated the 3D ship model through this library. The generated 3D STEP model of a ship structure can be used to exchange information between design departments in a shipyard as well as between classification societies and shipyards.

A Study on Aeroelastic Characteristic using Two-dimensional Full Aircraft (전기체 2차원 모델을 이용한 공력탄성학적 특성에 관한 연구)

  • Bong-Do Pyeon;Jae-Sung Bae
    • Journal of Aerospace System Engineering
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    • v.18 no.4
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    • pp.10-17
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    • 2024
  • Solar-powered unmanned aerial vehicles(SPUAV), which are being actively developed domestically and internationally, generally feature high aspect ratio(AR) wings. These high AR wings necessitate a lightweight design as their weight increases, rendering them susceptible to flutter. Consequently, flutter analysis is critical from the initial design phase. Typically, flutter analysis is conducted using a standard section wing or more precisely through a 3D model. However, due to the extended analysis time required by 3D models, this study opts for a 2D aircraft model. The 2D model computes faster than the 3D model and intuitively secures the flutter boundary. In this study, a structural/aerodynamic force model of the 2D aircraft was established, and the findings were compared with those from a 3D half model. The results showed that the flutter analysis between the 2D model and the 3D half model was similar, within about a 3% margin, thus validating the proposed 2D model's effectiveness.

A 3D facial Emotion Editor Using a 2D Comic Model (2D 코믹 모델을 이용한 3D 얼굴 표정 에디터)

  • 이용후;김상운;청목유직
    • Proceedings of the IEEK Conference
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    • 2000.06d
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    • pp.226-229
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    • 2000
  • A 2D comic model, a comic-style line drawing model having only eyebrows, eyes, nose and mouth, is much easier to generate facial expressions with small number of points than that of 3D model. In this paper we propose a 3D emotional editor using a 2D comic model, where emotional expressions are represented by using action units(AU) of FACS. Experiments show a possibility that the proposed method could be used efficiently for intelligent sign-language communications between avatars of different languages in the Internet cyberspace.

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Development of an Extension Model based on Three Dimensional Wireframe Model for KOSDIC Format in the Construction Field (건설 분야 도면정보 교환 표준을 위한 3차원 와이어프레임 기반의 확장 모델 개발에 관한 연구)

  • Kim I.H.;Seo J.C.;Won J.S.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.3
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    • pp.179-187
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    • 2005
  • The usage of mixed 2D and 3D CAD data of commercial CAD systems is required in the construction practice. Sometimes 3D wireframe model is required by end-users when 2D CAD data is delivered. However, current KOSDIC can not represent 3D CAD data, because it has been developed as a 2D drawing delivery standard. Therefore, this study is to provide exchange and sharing of mixed 2D and 3D CAD data that add 3D wireframe model in the KOSDIC. To achieve this purpose, the authors have investigated the 3D CAD entities of commercial CAD systems, and have analyzed STEP standards providing 3D wireframe model. The result, the authors have extracted 3D CAD common entities based wireframe model which shall be added in the KOSDIC. This study can be beneficial by using the developed data model for heterogeneous CAD systems, and by providing the representation of mixed 2D and 3D CAD data in construction practice such as GIS, piping system, and so forth.

Sharing Ship Design Model Based on STEP methodology (STEP 방법론을 이용한 선박설계 모델의 공유)

  • Yong-Jae Shin;Soon-Hung Han
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.4
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    • pp.98-108
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    • 1998
  • Hull design data is currently prepared by a 2D CAD system and re-input to 3D CAD systems specialized for detail design or to a structural analysis system. In this paper, sharing design data among different CAD systems has been studied. Based on STEP methodology, a neutral model is generated from 2D AutoCAD drawings. To handle a geometric data of this model, the non-manifold model of ACIS is used because it can support various CAD data representation such as 2D graphic entities, 3D wireframe, 3D surface model, and solid B-Rep/CSG model. It is observed that a mon-manifold model can easily be transformed to a 3-D wireframe model for the hull detail design system AutoDef or a FE model for the structural analysis system Nastran.

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Study on the 3D Modeling Data Conversion Algorithm from 2D Images (2D 이미지에서 3D 모델링 데이터 변환 알고리즘에 관한 연구)

  • Choi, Tea Jun;Lee, Hee Man;Kim, Eung Soo
    • Journal of Korea Multimedia Society
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    • v.19 no.2
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    • pp.479-486
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    • 2016
  • In this paper, the algorithm which can convert a 2D image into a 3D Model will be discussed. The 2D picture drawn by a user is scanned for image processing. The Canny algorithm is employed to find the contour. The waterfront algorithm is proposed to find foreground image area. The foreground area is segmented to decompose the complex shapes into simple shapes. Then, simple segmented foreground image is converted into 3D model to become a complex 3D model. The 3D conversion formular used in this paper is also discussed. The generated 3D model data will be useful for 3D animation and other 3D contents creation.

Pushover Analysis of Bearing Wall System with Macroscopic Models - For Comparisons of 2D and 3D Analysis Modelling (거시적 모델을 이용한 내력벽 시스템의 Pushover 해석 - 2차원과 3차원 해석 모델링의 비교)

  • Lee, Young-Wook
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.329-332
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    • 2006
  • To study the effect of the macroscopic TVLEM(Three Vertical Line Element Model) which is developed in 2D, a bearing wall system is selected and 2D and 3D pushover analyses are carried out. In 2D model, the participating width of a flage wall to lateral resistance is modelled based on Paulay's effective width. From the comparisons of roof displacements, 2D model which uses the effective width of flange wall has better prediction and less analysis time than 3D model which has intrinsically the full width of the flange that causes higher stiffness and strength and shorter deformation capacity than 2D model.

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