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Metrics for effective information visualization

Metrics for effective information visualization

引用

ieee symposium on Information visualization (INFOVIS)

作者： R. Brath Visible Decision Inc. Toronto Ont. Canada

Metrics for information visualization will help designers create and evaluate 3D information visualizations. Based on experience from 60+ 3D information visualizations, the metrics we propose are: number of data points and data density; number of dimensions and cognitive overhead; occlusion percentage; and reference context and percentage of identifiable points.

关键词： data visualization Guidelines Layout Navigation graphics Information geometry Testing Three dimensional displays Two dimensional displays Multidimensional systems

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The structure of the information visualization design space

The structure of the information visualization design space

引用

ieee symposium on Information visualization (INFOVIS)

作者： S.K. Card J. Mackinlay Xerox-PARC Palo Alto CA USA

Research on information visualization has reached the point where a number of successful point designs have been proposed and a variety of techniques have been discovered. It is now appropriate to describe and analyze portions of the design space so as to understand the differences among designs and to suggest new possibilities. This paper proposes an organization of the information visualization literature and illustrates it with a series of examples. The result is a framework for designing new visualizations and augmenting existing designs.

关键词： data visualization Space technology graphics data communication Taxonomy Color Visual communication Arithmetic Information analysis

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A scalable parallel cell-projection volume rendering algorithm for three-dimensional unstructured data 97

A scalable parallel cell-projection volume rendering algorit...

引用

parallel Rendering symposium

作者： Kwan-Liu Ma T.W. Crockett Institute for Computer Applications in Science and Engineering NASA-Langley Research Center Hampton VA USA

ISBN: (纸本)9781581130102

Visualizing three dimensional unstructured data from aerodynamics calculations is challenging because the associated meshes are typically large in size and irregular in both shape and resolution. The goal of this research is to develop a fast, efficient parallel volume rendering algorithm for massively parallel distributed memory supercomputers consisting of a large number of very powerful processors. We use cell projection instead of ray casting to provide maximum flexibility in the data distribution and rendering steps. Effective static load balancing is achieved with a round robin distribution of data cells among the processors. A spatial partitioning tree is used to guide the rendering, optimize the image compositing step, and reduce memory consumption. Communication cost is reduced by buffering messages and by overlapping communication with rendering calculations as much as possible. Tests on the IBM SP2 demonstrate that these strategies provide high rendering rates and good scalability. For a dataset containing half a million tetrahedral cells, we achieve two frames per second for a 400/spl times/400 pixel image using 128 processors.

关键词： Rendering (computer graphics) Round robin data visualization Aerodynamics Shape Supercomputers Casting Load management Costs Testing

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The use of a virtual environment for FE analysis of vehicle crash worthiness

The use of a virtual environment for FE analysis of vehicle ...

引用

ieee Annual International symposium Virtual Reality

作者： S. Kuschfeldt M. Schulz T. Ertl T. Reuding M. Holzner Computer Graphics Group University of Erlangen Erlangen Germany Entwicklung Karosserie BMW AG Muenchen Germany

The advances in computer graphics technology plus the increased complexity of finite element (FE) simulations of the crash behavior of a car body have resulted in the need for new visualization techniques to facilitate the analysis of such engineering computations. The VR system VtCrash provides novel computer-human interface techniques for intuitive and interactive analysis of large amounts of crash simulation data. VtCrash takes geometry and physical properties data as input and enables the user to enter a virtual crash and to interact with any part of the vehicle.

关键词： Virtual environment Iron Vehicle crash testing Computational modeling Analytical models Computer simulation Computer graphics Finite element methods data visualization Automotive engineering

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Design and evaluation of incremental data structures and algorithms for dynamic query interfaces

Design and evaluation of incremental data structures and alg...

引用

ieee symposium on Information visualization (INFOVIS)

作者： E. Tanin R. Beigel B. Shneiderman Human Computer Interaction Laboratory Department of Computer Science University of Maryland USA

A dynamic query interface (DQI) is a database access mechanism that provides continuous real-time feedback to the user during query formulation. Previous work shows that DQIs are elegant and powerful interfaces to small databases. Unfortunately, when applied to large databases, previous DQI algorithms slow to a crawl. We present a new incremental approach to DQI algorithms and display updates that work well with large databases, both in theory and in practice.

关键词： Algorithm design and analysis data structures Heuristic algorithms Displays Visual databases NASA Computer science Feedback data visualization Bars

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Managing software with new visual representations

Managing software with new visual representations

引用

ieee symposium on Information visualization (INFOVIS)

作者： M.C. Chuah S.G. Eick Sch. of Comput. Sci. Carnegie Mellon Univ. Pittsburgh PA USA Bell Laboratories Naperville IL USA

Managing large projects is a very challenging task requiring the tracking and scheduling of many resources. Although new technologies have made it possible to automatically collect data on project resources, it is very difficult to access this data because of its size and lack of structure. We present three novel glyphs for simplifying this process and apply them to visualizing statistics from a multi-million line software project. These glyphs address four important needs in project management: viewing time dependent data; managing large data volumes; dealing with diverse data types; and correspondence of data to real-world concepts.

关键词： Project management data visualization Engineering management Human resource management Computer science Resource management Processor scheduling Statistics Software engineering Production

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Cacti: a front end for program visualization

Cacti: a front end for program visualization

引用

ieee symposium on Information visualization (INFOVIS)

作者： S.P. Reiss Department of Computer Science Brown University Providence RI USA

We describe a system that allows the user to rapidly construct program visualizations over a variety of data sources. Such a system is a necessary foundation for using visualization as an aid to software understanding. The system supports an arbitrary set of data sources so that information from both static and dynamic analysis can be combined to offer meaningful software visualizations. It provides the user with a visual universal-relation front end that supports the definition of queries over multiple data sources without knowledge of the structure or contents of the sources. It uses a flexible back end with a range of different visualizations, most geared to the efficient display of large amounts of data. The result is a high-quality, easy-to-define program visualization that can address specific problems and hence is useful for software understanding. The overall system is flexible and extensible in that both the underlying data model and the set of visualizations are defined in resource files.

关键词： data visualization Software maintenance Information analysis Software standards Computer science Displays Software quality data models Programming profession Timing

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Visualizing information on a sphere

Visualizing information on a sphere

引用

ieee symposium on Information visualization (INFOVIS)

作者： M.H. Gross T.C. Sprenger J. Finger Department of Computer Science Federal Institute of Technology (ETH) Zurich Switzerland Department of Computer Science University of Freiburg Germany

We describe a method for the visualization of information units on spherical domains which is employed in the banking industry for risk analysis, stock prediction and other tasks. The system is based on a quantification of the similarity of related objects that governs the parameters of a mass-spring system. Unlike existing approaches we initialize all information units onto the inner surface of two concentric spheres and attach them with springs to the outer sphere. Since the spring stiffnesses correspond to the computed similarity measures, the system converges into an energy minimum which reveals multidimensional relations and adjacencies in terms of spatial neighborhoods. Depending on the application scenario our approach supports different topological arrangements of related objects. In order to cope with large data sets we propose a blobby clustering mechanism that enables encapsulation of similar objects by implicit shapes. In addition, we implemented various interaction techniques allowing semantic analysis of the underlying data sets. Our prototype system IVORY is written in Java, and its versatility is illustrated by an example from financial service providers.

关键词： data visualization Multidimensional systems Computer science World Wide Web Fingers Banking Computer industry Risk analysis Energy measurement Encapsulation

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H3: laying out large directed graphs in 3D hyperbolic space

H3: laying out large directed graphs in 3D hyperbolic space

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ieee symposium on Information visualization (INFOVIS)

作者： T. Munzner University of Stanford Stanford CA USA

We present the H3 layout technique for drawing large directed graphs as node-link diagrams in 3D hyperbolic space. We can lay out much larger structures than can be handled using traditional techniques for drawing general graphs because we assume a hierarchical nature of the data. We impose a hierarchy on the graph by using domain-specific knowledge to find an appropriate spanning tree. Links which are not part of the spanning tree do not influence the layout but can be selectively drawn by user request. The volume of hyperbolic 3-space increases exponentially, as opposed to the familiar geometric increase of euclidean 3-space. We exploit this exponential amount of room by computing the layout according to the hyperbolic metric. We optimize the cone tree layout algorithm for 3D hyperbolic space by placing children on a hemisphere around the cone mouth instead of on its perimeter. Hyperbolic navigation affords a Focus+Context view of the structure with minimal visual clutter. We have successfully laid out hierarchies of over 20,000 nodes. Our implementation accommodates navigation through graphs too large to be rendered interactively by allowing the user to explicitly prune or expand subtrees.

关键词： Tree graphs visualization Navigation Mouth Information systems Computer science File systems Web sites Web page design History

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An unstructured grid-based parallel solver for time-domain Maxwell's equations

An unstructured grid-based parallel solver for time-domain M...

引用

Antennas and Propagation Society International symposium

作者： V. Shankar C. Rowell W.F. Hall Rockwell International Science Center Thousand Oaks CA USA

Computational simulation of complex physical processes encountered in the design of advanced defense and commercial products increasingly requires modeling the complete three-dimensional geometrical details with tens of millions of grid cells to properly capture the physics. Advances in parallel computing, both in hardware and software, now make it feasible to solve such large scale simulations in a timely manner. The paper describes some of the work carried out at Rockwell in performing parallel computing in computational electromagnetics.

关键词： Maxwell equations Integral equations Computational modeling Grid computing parallel processing Geometry Physics computing Solid modeling Load management data visualization

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