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Spherical self-organizing feature map: An introductory review

INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS 2006年第11期16卷 3195-3206页

作者： Sangole, Archana P. Leontitsis, Alexandros Inst Rehabil CRIR Montreal PQ H3S 2J4 Canada Univ Ioannina Dept Educ GR-45110 Ioannina Greece Univ Patras Ctr Res & Applicat Nonlinear Syst Patras 26500 Greece

The self-organizing feature map (SOFM) has received great attention from researchers in a variety of areas such as engineering sciences, medicine, biology and economics. The topology of these maps is usually based on 1, 2, or 3 dimensions, forming a lattice. This article discusses various aspects of the spherical SOFMs along with examples illustrating its implementation on high-dimensional data. The main advantage of the spherical SOFM is the ability to visualize complex high-dimensional data by encapsulating physical measures of the data within the 3D attributes of its spherical lattice. The article presents the potential of the spherical SOFM to visualize nonlinear data using examples of two chaotic maps, Henon and Ikeda, with a fractal dimension of 1.2 and 1.7 respectively embedded in 2-5 dimensions.

关键词： spherical self-organizing feature map visualizing nonlinearity scientific data visualization deformable spherical maps interactive information analysis

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Virtual Tubelets -: Efficiently visualizing large amounts of particle trajectories

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COMPUTERS & GRAPHICS-UK 2005年第1期29卷 17-27页

作者： Schirski, M Kuhlen, T Hopp, M Adomeit, P Pischinger, S Bischof, C Univ Aachen Rhein Westfal TH Aachen Ctr Comp & Commun D-52074 Aachen Germany FEV Motorentech GmbH D-52078 Aachen Germany Univ Aachen Rhein Westfal TH Aachen Inst Internal Combust Engines VKA D-52062 Aachen Germany

The depiction of particle trajectories is an effective means for the visualization of fluid flows. However, standard visualization techniques suffer from a variety of weaknesses, ranging from ambiguous depth perception for simple line drawings to a high geometrical complexity and decreased interactivity for polygonal tubes. This paper addresses these problems by introducing a novel approach to pathline visualization, which we call Virtual Tubelets. It employs billboarding techniques in combination with suitable textures in order to create the illusion of solid tubes, thus efficiently and unambiguously depicting large amounts of particle trajectories at interactive frame rates. By choosing an appropriate orientation for the billboards, certain issues concerning immersive displays with multiple projection screens are resolved, which allows for an unrestricted use in virtual environments as well. Using modern graphics hardware with programmable vertex and pixel pipelines results in an additional speed-up of the rendering process and a further improvement of image quality. This creates a nearly perfect illusion of tubular geometry, including plausible intersections and consistent illumination with the rest of the scene. The efficiency of our approach is proven by comparing rendering speed and visual quality of Virtual Tubelets to that of conventional, polygonal tube renderings. (c) 2004 Elsevier Ltd. All rights reserved.

关键词： virtual reality scientific data visualization viewing algorithms programmable graphics hardware

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Visual identification of structure in four dimensional data

Visual identification of structure in four dimensional data

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10th Annual Conference on visualization and data Analysis

作者： Johnson, RR Millar, RD Ben, I LLC N Dimens Visualizat Salt Lake City UT 84115 USA

ISBN: (纸本)0819448095

Structure in 4-D data is visualized with a new modeling algorithm called SBP. The SBP vector fusion algorithm makes 3-D display space models of data having any dimensionality that is input in matrix form. SBP maps points on complete manifolds in 4-D to 3-D to visualize any 4-D data. Starting with familiar shapes in 2-D data, 3-D models are constructed to demonstrate how SBP works. Then 3-D data is modeled in 3-D display space. Finally 4-D data are modeled in 3-D display space. The 3-D display space models are points mapped from collections of points on 4-D manifolds. Two types of SBP models are discussed: the latitude/longitude collection and the helical collection. SBP also maps points on complete manifolds of n-D data to 3-D display space models. The objective of this work is to present what 4-D spheres and tori look like when visualized from 4-D data using the SBP algorithm. This demonstrates the SBP. algorithm as a new and useful tool for visualizing and understanding 4-D data, and by implication, n-D geometry. Future uses for SBP could be modeling and studying protein structure and space-time structure in general relativity and string theory.

关键词： data mining data structure scientific data visualization data visualization

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Detection and visualization of anomalous structures in molecular dynamics simulation data 04

Detection and visualization of anomalous structures in molec...

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IEEE visualization 2004 Conference

作者： Mehta, S Hazzard, K Machiraju, R Parthasarathy, S Wilkins, J Ohio State Univ Columbus OH 43210 USA

ISBN: (纸本)0780387880

In this article we explore techniques to detect and visualize features in data from molecular dynamics (MD) simulations. Although the techniques proposed are general, we focus on silicon (Si) atomic systems. The first set of methods use 3D location of atoms. Defects are detected and categorized using local operators and statistical modeling. Our second set of exploratory techniques employ electron density data. This data is visualized to glean the defects. We describe techniques to automatically detect the salient iso-values for iso-surface extraction and designing transfer functions. We compare and contrast the results obtained from both sources of data. Essentially, we find that the methods of defect (feature) detection are at least as robust as those based on the exploration of electron density for Si systems.

关键词： feature extraction scientific data visualization data mining iso-surface transfer functions molecular dynamics

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Sound field visualization with data-driven simulation for trapezoidal room shape

Sound field visualization with data-driven simulation for tr...

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International Workshop on Advanced Imaging Technology (IWAIT)

作者： Sato, Gen Ikeda, Yusuke Tokyo Denki Univ 5 Senjyu Asahi ChoAdati Ku Tokyo Japan

ISBN: (数字)9781510679931

ISBN: (纸本)9781510679931;9781510679924

Sound field visualization aids in elucidating complicated sound propagation. Numerical simulation is one of visualization methods and incurs high computational costs. In this study, we proposed 2D sound field visualization using deep learning from the room shape. Through an experiment, the proposed method yielded high estimation accuracy for visualization in the asymmetric trapezoidal shapes of rooms.

关键词： deep neural network scientific data visualization signal processing convolutional neural network

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Interactive MR visualization system of 3D sound field with physical model of sound propagation

Interactive MR visualization system of 3D sound field with p...

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International Workshop on Advanced Imaging Technology (IWAIT)

作者： Uchida, Ayame Tsunokuni, Izumi Ikeda, Yusuke Inoue, Atsuto Oikawa, Yasuhiro Tokyo Denki Univ Dept Informat Syst & Multimedia Design Tokyo Japan INSPIREI Tokyo Japan Waseda Univ Dept Intermedia Art & Sci Tokyo Japan

ISBN: (数字)9781510679931

ISBN: (纸本)9781510679931;9781510679924

Sound field visualization helps us understand and analyze sound propagation. To visualize the sound field in an actual room, the sound pressures at all observed points should be measured. However, the number of measurement points significantly increases as the resolution and area of visualization are increased. Moreover, the large amount of data makes it difficult to display all the information in the 3D sound field. In this study, we propose an interactive Mixed Reality (MR) visualization system of the 3D sound field in a room. We estimate the sound field in a room using a small number of microphones based on a physical model of sound propagation and then visualize the sound field by interactively changing the visualization region by hand gesture.

关键词： Sound Field Modeling scientific data visualization Mixed Reality Augmented Reality

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Navigating high-dimensional spaces to support design steering

Navigating high-dimensional spaces to support design steerin...

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IEEE visualization Conference

作者： Wright, H Brodlie, K David, T Univ Hull Dept Comp Sci Kingston Upon Hull HU6 7RX N Humberside England

ISBN: (纸本)0780364783

Throughout the design cycle, visualization, whether a sketch scribbled on the back of a spare piece of paper or a fully detailed drawing, has been the mainstay of design: we need to see the product. One of the most important stages of the design cycle is the initial, or concept, stage and it is here that design variants occur in large numbers to be vetted quickly. At this initial stage the human element - the designer - is crucial to the success of the product. In this paper we describe an interactive environment for concept design which recognises the needs of the designer, not only to see the product and make rapid modifications, but also to monitor the progress of their design towards some preferred solution. This leads to the notion of a design parameter space, typically high-dimensional, which must also be visualized in addition to the product itself. Using a module developed for IRIS Explorer(TM),, design steering is presented as a navigation of this space in order to search for optimal designs, either manually or by local optimisation.

关键词： computational steering design steering concept design multidimensional visualization scientific data visualization

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Virtual Tubelets -: Efficiently visualizing large amounts of particle trajectories

<i>Virtual Tubelets</i> -: Efficiently visualizing large amo...

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International Conference on Virtual Reality Continuum and Its Applications in Industry (VRCIA)

关键词： virtual reality scientific data visualization viewing algorithms programmable graphics hardware

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The proxy chain method and its application to scientific visualization

The proxy chain method and its application to scientific vis...

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14th Symposium on Haptics Interfaces for Virtual Environment and Teleoperator Systems

作者： Ikits, Milan Hansen, Charles D. Univ Utah Sci Comp & Imaging Inst Salt Lake City UT 84112 USA

ISBN: (纸本)1424402263

We present a method for combining multiple point-based constraints in haptic programming environments. Instead of using a single proxy point for haptic feedback, the method maintains a separate proxy for each constraint. The reaction force is computed by linking the proxies in a chain. Constraints are applied in sequential order, such that the proxy found in the current step becomes the probe for the next step in the chain. The advantage of the method over previous approaches is that the constraints are maintained precisely and the output is well-defined. We illustrate the method with examples from the domain of 3D scientific data visualization. Finally, we present the results of an experiment conducted to quantify the contribution of haptic guidance in two representative vector field exploration tasks.

关键词： haptic rendering scientific data visualization human-computer interaction

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Representing high-dimensional data sets as closed surfaces

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Information visualization 2002年第2期1卷 111-119页

作者： Sangole, Archana Knopf, George K. Department of Mechanical & Materials Engineering Faculty of Engineering University of Western Ontario London Ontario Canada

scientific data visualization provides scientists and engineers with a deeper insight and greater understanding about physical phenomena through the use of graphical tools. Individuals are able to identify patterns embedded in data sets using visual cues such as color and shape, rather than directly searching through a vast volume of numbers. The visualization algorithm described in this paper utilizes a spherical self-organizing feature map (SOFM) to automatically cluster and develop a well-defined topology of arbitrary data vectors, based on a pre-defined measure of similarity, and generate a three-dimensional color-coded surface model that reflects cluster variations. Implementation of this self-organizing surface geometry for data visualization applications is illustrated by examining the graphical forms created for a small synthetic test data set and a large environmental data-base. The proposed methodology provides the researcher with a new tool to encode information into shape and easily transfer the geometric model to an immersive virtual reality (IVR) environment for interactive information analysis. © 2002, SAGE Publications. All rights reserved.

关键词： interactive information analysis scientific data visualization self-organizing feature map spherical representations

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