• Title/Summary/Keyword: 3-D visualization

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Measurements of 3-D Deflection Characteristics of a Flexible Plate Levitated by Non-Contact Grippers Using SPIV Method (SPIV 기법을 이용한 비접촉 그리퍼에 의해 공중부양된 유연판의 3차원 변형 특성 측정)

  • Kim, Jaewoo;Kim, Joon Hyun;Lee, Yung Hoon;Sung, Jaeyong
    • Journal of the Korean Society of Visualization
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    • v.19 no.3
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    • pp.54-62
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    • 2021
  • This study has investigated the 3-D deflection characteristics of a flexible plate levitated by non-contact grippers using SPIV method. The measuring instrument consisted of a flexible plate located under four non-contact grippers and two cameras at the bottom of a transparent acrylic plate. Measurements were made on two materials (PVC and PC) for the plate with 50×50 cm2 area and 1 mm thickness. The deflection characteristics and flatness vary depending on the plate material, the gripper position and the air flow supplied to the gripper. For the material of PVC, the overall defection is convex. As the gripper position goes outward from the plate center, the upmost bending point also moves to the outside of the plate with the flatness increasing. However, the air flow rate does not affect the deflection pattern except for the small increase of flatness. For the material of PC, the shape of deflection changes from convex to concave as the gripper position goes out. The flatness is the highest at the point of transition from convex to concave, but the air flowrate has little effect on the flatness.

Compression and Visualization Techniques for Time-Varying Volume Data (시변 볼륨 데이터의 압축과 가시화 기법)

  • Sohn, Bong-Soo
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.3
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    • pp.85-93
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    • 2007
  • This paper describes a compression scheme for volumetric video data(3D space X 1D time) there each frame of the volume is decompressed and rendered in real-time. Since even one frame size of volume is very large, runtime decompression can be a bottleneck for real-time playback of time-varying volume data. To increase the run-time decompression speed and compression ratio, we decompose the volume into small blocks and only update significantly changing blocks. The results show that our compression scheme compromises decompression speed and image quality well enough for interactive time-varying visualization.

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A Study of the Relationship between 3D Model and 3D Garment Simulation

  • Kim, Yeo-Sook;Park, Hye-Won
    • Journal of the Korean Society of Clothing and Textiles
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    • v.36 no.6
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    • pp.631-640
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    • 2012
  • This research project investigates the differences of various body locations (between 3D body models) and drapes garments digitally onto 3D body models. Three different subject models will be given explication. It consisted of (1) data collection of three-dimensional scans (2) creation of 3D body representations (3) comparison of avatar shapes and measurements (4) visualization and assessment of 3D body models and their 3D virtual garments. The study tests a theory of impact by differences in avatars by pattern design. A visual inspection of avatars showed clear differences between the six avatar types (in the generating process); however, there was notably less difference between 3D garment simulations based upon the six avatars produced. This demonstrated that there was less influence on the 3D garments than was predicted after a visual inspection of the avatars.

Visualization of 3D STEP Geometry Data on the Internet (인터넷에서 3차원 STEP 형상정보의 가시화)

  • Oh, Yuchon;Han, Soon-Hung
    • Journal of the Korea Computer Graphics Society
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    • v.2 no.2
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    • pp.69-74
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    • 1996
  • With the emergence of integrated global market and increased competition, many companies are interested in sharing the product model data. One of the solutions is to share the product model data over the computer network or the internet using a standard format. CAD/CAM, STEP, and internet technologies make it possible to share the product model data. This paper presents methods to visualize 3D STEP geometry data on the internet. To create an internet-based STEP model visualizer, the programming language Java and 3D scene description language VRML have been experimented. The STEP geometry data can be displayed either by Java applets of by a VRML browser. These visualization technologies are applied to a PDM development. Engineers who have a low cost web browser can share the expensive design information even at a remote site.

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Numerical Study on the Flow Characteristics of Uniflow Cyclone (단방향 사이클론의 유동 특성에 관한 수치해석적 연구)

  • Yan, Zheng-Qi;Zhang, Shuo;Shin, Weon Gyu
    • Journal of the Korean Society of Visualization
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    • v.18 no.3
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    • pp.77-83
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    • 2020
  • A uniflow cyclone has simple structure with a single channel in one direction. The one directional particle removal enables the uniflow cyclone to have compact size and low pressure drop. However, it has low collection efficiency compared to conventional cyclones. In this study, the effect of primary geometry on the performance of a uniflow cyclone with swirl vane is numerically investigated for the design of high performance uniflow cyclone. It is found that as the vortex finder diameter is increased, the pressure drop and the collection efficiency are decreased. Also, the same trend is predicted when the vortex finder height is increased. The best collection efficiency is predicted to be obtained when the vortex finder height is equal to the diameter of a cyclone. Reducing the body height by half will increase the pressure drop by 41%. When the body height is decreased, the collection efficiency is first increased and then decreased. The best collection efficiency is obtained when the body height is 4~5 times the cyclone diameter. Overall, the particle collection efficiency is highest when the Dν/D is equal to 0.3. But, the pressure drop is as high as 1592 Pa. Considering both collection efficiency and pressure drop, the best design is when Dν/D, Hν/D, and Hb/D are equal to 0.5, 1, and 5, respectively.

Development of Automatic System for 3D Visualization of Biological Objects

  • Choi, Tae Hyun;Hwnag, Heon;Kim, Chul Su
    • Agricultural and Biosystems Engineering
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    • v.1 no.2
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    • pp.95-99
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    • 2000
  • Nondestructive methods such as ultrasonic and magnetic resonance imaging systems have many advantages but still much expensive. And they do not give exact color information and may miss some details. If it is allowed to destruct some biological objects to get interior and exterior informations, constructing 3D image form a series of slices sectional images gives more useful information with relatively low cost. In this paper, a PC based automatic 3D model generator was developed. The system was composed of three modules. The first module was the object handling and image acquisition module, which fed and sliced the object sequentially and maintains the paraffine cool to be in solid state and captures the sectional image consecutively. The second one was the system control and interface module, which controls actuators for feeding, slicing, and image capturing. And the last was the image processing and visualization module, which processed a series of acquired sectional images and generated 3D volumetric model. Handling module was composed of the gripper, which grasped and fed the object and the cutting device, which cuts the object by moving cutting edge forward and backward. sliced sectional images were acquired and saved in a form of bitmap file. 2D sectional image files were segmented from the background paraffine and utilized to generate the 3D model. Once 3-D model was constructed on the computer, user could manipulated it with various transformation methods such as translation, rotation, scaling including arbitrary sectional view.

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Topology Preserving Tetrahedral Decomposition Applied To Trilinear Interval Volume Tetrahedrization

  • Sohn, Bong-Soo
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.3 no.6
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    • pp.667-681
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    • 2009
  • We describe a method to decompose a cube with trilinear interpolation into a collection of tetrahedra with linear interpolation, where the isosurface topology is preserved for all isovalues during decomposition. Visualization algorithms that require input scalar data to be defined on a tetrahedral grid can utilize our method to process 3D rectilinear data with topological correctness. As one of many possible examples, we apply the decomposition method to topologically accurate tetrahedral mesh extraction of an interval volume from trilinear volumetric imaging data. The topological correctness of the resulting mesh can be critical for accurate simulation and visualization.

A proposal of total energy operating system development using spatial information visualization and energy monitoring - Case study on design of total operation system in Sejong city - (건물 에너지 모니터링과 공간정보 시각화를 이용한 에너지 통합 운영시스템 개발 방안 제안 - 세종시 첫마을 공공건물을 대상으로 한 시스템 구축 사례 -)

  • Kwon, KeeJung;Lee, DongHwan;Cha, KiChun;Park, SeungHee
    • Journal of KIBIM
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    • v.4 no.1
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    • pp.8-12
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    • 2014
  • This research and project is going on the Korean government. The objective of project is that developing total energy management solution. So, this paper is going to introduce a proposal that energy total operating system development using spatial information visualization and energy monitoring. It could efficiently operate the building energy wirelessly controling cooling/heating, lighting, air-conditioning and geothermal system. The metering data is collected to total database. The data is linked to BAS gateway, which is connected the device by the standard protocol.

Developemtn of Vehicle Dynamics Program AutoDyn7(II) - Pre-Processor and Post-Processor (차량동역학 해석 프로그램 AutoDyn7의 개발(∥) - 전처리 및 후처리 프로그램)

  • 한종규;김두현;김성수;유완석;김상섭
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.3
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    • pp.190-197
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    • 2000
  • A graphic vehicle modeling pre-processing program and a visualization post-processing program have been developed for AutoDyn7, which is a special program for vehicle dynamics. The Rapid-App for GUI(Graphic User Interface) builder and the Open Inventor for 3D graphic library have been employed to develop these programs in Silicon Graphics workstation. A Graphic User Interface program integrates vehicle modeling pre-processor, AutoDyn7 analysis processor, and visualization post-processor. In vehicle modeling pre-processor, vehicle hard point data for a suspension model are automatically converted into multibody vehicle system data. An interactive graphics capabilities provides suspension modeling aides to verify user input data interactively. In visualization post-processor, vehicle virtual test simulation results are animated with virtual testing environments.

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Visualization of Ocean Environments through VRML (VRML을 이용한 해역환경 가시화 연구)

  • Kim, Jong-Kyu;Park, Sang-Woo;Kim, Jong-Hwa
    • Journal of Fisheries and Marine Sciences Education
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    • v.17 no.3
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    • pp.427-433
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    • 2005
  • The study of Web GUI(Graphic User Information) system for Virtual Reality System is mainly performed on effective methodology which transform real world data to computing world data. MGIS(Marine Geographic Information System) has its own target on reliable data service by acquisition of geometric information using accurate measurement and graphical visualization. This type of raw data visualization can be built without software tools, yet is incredibly useful for interpreting and communicating data. Even simple visualizations can aid in the interpretation of complex 3D relationships that are frequently encountered in the geosciences. The Virtual Reality Modeling Language provides an easy way for geoscientists to construct complex visualizations that can be viewed with free software. This study propose a three dimensional Web GUI system using MGIS-based three dimensional data models and virtual imaging system. Finally, we design a Web GUI system integrating above data models.