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International Workshop on Volume Graphics, VG

作者： H. Akiba Kwan-Liu Ma J. Clyne Institute for Data Analysis and Visualization University of California슠Davis USA Scientific Computing Devision National Center for Atmospheric Research CO USA

ISBN: (纸本)3905673266

We present a systematic approach for direct volume rendering terascale-sized data that are time-varying, and possibly non-uniformly sampled, using only a single commodity graphics PC. Our method employs a data reduction scheme that combines lossless, wavelet-based progressive data access with a user-directed, hardware-accelerated data packing technique. Data packing is achieved by discarding data blocks with values outside the data interval of interest and encoding the remaining data in a structure that can be efficiently decoded in the GPU. The compressed data can be transferred between disk, main memory, and video memory more efficiently, leading to more effective data exploration in both spatial and temporal domains. Furthermore, our texture-map based volume rendering system is capable of correctly displaying data that are sampled on a stretched, Cartesian grid. To study the effectiveness of our technique we used data sets generated from a large solar convection simulation, computed on a non-uniform, 504/spl times/504/spl times/2048 grid.

关键词： Hardware Acceleration Data visualization Rendering (computer graphics) Time varying systems Graphics Encoding Decoding Video compression Mesh generation

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Gesture and response in field-based performance

Gesture and response in field-based performance

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Creativity and Cognition Proceedings 2005

作者： Wei, Sha Xin Gill, Satinder Topological Media Lab Graphics Visualization and Usability Center Georgia Institute of Technology Cambridge United Kingdom Program in Science Technology and Society Massachusetts Institute of Technology Cambridge United Kingdom Interaction Design Centre School of Computing Science Middlesex University London United Kingdom Centre for Music and Science Cambridge United Kingdom

ISBN: (纸本)1595930256

Ambience and immersive technological environments allow us to explore some basics of human pragmatics that lie beyond linguistics, intentionality and the subject-agency perspectives of human interaction. We focus on gesture and the body in sense-making and propose a discussion drawing on a non-dualist and agent-free account of embodied, material experience. By agent-free we mean an approach that does not presume a monolithic subject. Moreover, we deal with the problem of intersubjectivity by studying the human coordination of activity without appealing to a transmission theory of communication. [6] We achieve this by considering how gesture spans multiple bodies and how aesthetic design works with this and facilitates it. The paper is in two parts, the first part covers movement studies, focusing on gesture and body movement, drawing on the acting and pragmatics, and the second part develops this with the example of the TGarden, a responsive play space for experimental performance augmented by gesturally nuanced computational media. Copyright 2005 ACM.

关键词： Gesture recognition

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Maximizing adaptivity in hierarchical topological models

Maximizing adaptivity in hierarchical topological models

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International Conference on Shape Modeling and Applications

作者： P.-T. Bremer V. Pascucci B. Hamann Department of Computer Science University of Illinois Urbana-Champaign USA Lawrence Livermore National Laboratory Center for Applied Scientific Computing USA Institute for Data Analysis and Visualization Department of Computer Science University of California Davis USA

We present an approach to hierarchically encode the topology of functions over triangulated surfaces. Its Morse-Smale complex, a well known structure in computational topology, describes the topology of a function. Following concepts of Morse theory, a Morse-Smale complex (and therefore a function's topology) can be simplified by successively canceling pairs of critical points. We demonstrate how cancellations can be effectively encoded to produce a highly adaptive topology-based multi-resolution representation of a given function. Contrary to the approach, we avoid encoding the complete complex in a traditional mesh hierarchy. Instead, the information is split into a new structure we call a cancellation forest and a traditional dependency graph. The combination of this new structure with a traditional mesh hierarchy proofs to be significantly more flexible than the one previously reported. In particular, we can create hierarchies that are guaranteed to be of logarithmic height.

关键词： Topology Data visualization Data analysis Computer science Encoding Level set Shape Scientific computing Laboratories Transfer functions

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SCIRun/BioPSE: integrated problem solving environment for bioelectric field problems and visualization

SCIRun/BioPSE: integrated problem solving environment for bi...

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IEEE International Symposium on Biomedical Imaging

作者： R.S. MacLeod O.M. Weinstein J. Davison de St Germain D.H. Brooks C.R. Johnson S.G. Parker Scientific Computing and Imaging Institute University of Utah Salt Lake UT USA Department of Electrical and Computer Engineering Northeastern University Boston MA USA Center for Bioelectric Field Modeling Simulation and Visualization NIH/NCRR

SCIRun is a general purpose problem solving environment that seeks to integrate the steps of preparing, executing, and visualizing simulations of physical and biological systems. The implementation of SCIRun is by means of an interactive dataflow network consisting of modules and data pipes exposed as a visual programming language. SCIRun also contains specific modules for bioelectric field simulations and visualizations and the combination of SCIRun with this package is known as BioPSE (***/software/biopse). This software has been in the public domain since 2000 and in that time we have developed strategies for software development, engineering, testing, documentation, and training. We have also continued to expand the scope of the SCIRun/BioPSE package not only through our own codes but by constructing bridges to other systems, both open source and proprietary. We have also created a repository for relevant sample networks and datasets with the aim of allowing diverse groups to test and evaluate algorithms using identical data and to share their results with the community for comparison of performance and accuracy. We present here a summary of the software system and describe specific experiences and conclusions with regard to creating and managing a large open source software project carried out within a university setting.

关键词： Biopsy Problem-solving Bioelectric phenomena Data visualization Biological system modeling Packaging Biological systems Computer languages Software packages Programming

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Multiple Grains in Nanocrystals: Effect of Initial Shape and Size on Transformed Structures Under Pressure

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Physical Review Letters 2004年第20期93卷 203401-203401页

作者： Sanjay Kodiyalam Rajiv K. Kalia Aiichiro Nakano Priya Vashishta Biological Computation and Visualization Center Department of Physics & Astronomy and Department of Computer Science Louisiana State University Baton Rouge LA 70803-4001 USA Collaboratory for Advanced Computing and Simulations Departments of Material Science & Engineering Physics & Astronomy Computer Science and Biomedical Engineering University of Southern California Los Angeles CA 90089-0242 USA

Pressure-induced structural transformations in spherical and faceted gallium arsenide nanocrystals of various shapes and sizes are investigated with a parallel molecular-dynamics approach. The results show that the pressure for zinc blende to rocksalt structural transformation depends on the nanocrystal size, and all nanocrystals undergo nonuniform deformation during the transformation. Spherical nanocrystals above a critical diameter ≥44 Å transform with grain boundaries. Faceted nanocrystals of comparable size have grain boundaries in 60% of the cases, whereas the other 40% are free of grain boundaries. The structure of transformed nanocrystals shows that domain orientation and strain relative to the initial zinc blende lattice are not equivalent. These observations may have implications in interpreting the experimental x-ray line shapes from transformed nanocrystals.

关键词： .ending undergo Grains grain boundaries rocksalt VOLUME NUMBER week structural transformation Transformed Structures nanocrystal size Spherical nanocrystals Faceted nanocrystals transformed nanocrystals strain relative zinc blende lattice

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An improved N-bit to N-bit reversible Haar-like transform

An improved N-bit to N-bit reversible Haar-like transform

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Pacific Conference on Computer Graphics and Applications

作者： J.G. Senecal P. Lindstrom M.A. Duchaineau K.I. Joy Inst. for Sci. Comput. Res. Lawrence Livermore Nat. Lab. CA USA Center for Applied Scientific Computing Lawrence Livemore National Laboratory USA Institute for Data Analysis and Visualization Computer Science Department University of California Davis USA

We introduce the piecewise-linear Haar (PLHaar) transform, a reversible n-bit to n-bit transform that is based on the Haar wavelet transform. PLHaar is continuous, while all current n-bit to n-bit methods are not, and is therefore uniquely usable with both lossy and lossless methods (e.g. image compression). PLHaar has both integer and continuous (i.e. non-discrete) forms. By keeping the coefficients to n bits PLHaar is particularly suited for use in hardware environments where channel width is limited, such as digital video channels and graphics hardware.

关键词： Wavelet transforms Continuous wavelet transforms Hardware Dynamic range Image coding Scientific computing Image reconstruction Laboratories Data analysis Data visualization

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Atomistic mechanisms for wurtzite-to-rocksalt structural transformation in cadmium selenide under pressure

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Physical Review B 2004年第18期70卷 184111-184111页

作者： Fuyuki Shimojo Sanjay Kodiyalam Ingvar Ebbsjö Rajiv K. Kalia Aiichiro Nakano Priya Vashishta Collaboratory for Advanced Computing and Simulations Department of Physics & Astronomy Department of Computer Science Department of Material Science & Engineering and Department of Biomedical Engineering University of Southern California Los Angeles California 90089 USA Department of Physics Kumamoto University Kumamoto 860-8555 Japan Biological Computation and Visualization Center Louisiana State University Baton Rouge Louisiana 70803 USA Studsvik Neutron Research Laboratory University of Uppsala Nyköping Sweden

The pressure-induced structural transformation in cadmium selenide is studied with the isothermal-isobaric molecular-dynamics method and electronic-structure calculations based on the density-functional theory. The reversible transformation between the fourfold-coordinated wurtzite structure and the sixfold-coordinated rocksalt structure is successfully reproduced in the molecular-dynamics simulations, in which atomistic transition mechanisms including the existence of a metastable state as well as barrier states along the transition paths are observed. Accurate density-functional calculations confirm these transition paths. It is shown that there are at least three transition paths, which are characterized by atomic shifts in the (0001) plane of the wurtzite structure. The energy barrier for the transformation is found to be about 0.13eV∕pair and is almost independent of the paths.

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Double exponential smoothing: An alternative to Kalman filter-based predictive tracking

Double exponential smoothing: An alternative to Kalman filte...

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9th EUROGRAPHICS Workshop on Virtual Environments, EGVE 2003

作者： LaViola Jr., Joseph J. Brown University Technology Center for Advanced Scientific Computing and Visualization PO Box 1910 Providence RI 02912 United States

ISBN: (纸本)1581136862

We present novel algorithms for predictive tracking of user position and orientation based on double exponential smoothing. These algorithms, when compared against Kalman and extended Kalman filter-based predictors with derivative free measurement models, run approximately 135 times faster with equivalent prediction performance and simpler implementations. This paper describes these algorithms in detail along with the Kalman and extended Kalman Filter predictors tested against. In addition, we describe the details of a predictor experiment and present empirical results supporting the validity of our claims that these predictors are faster, easier to implement, and perform equivalently to the Kalman and extended Kalman filtering predictors. © 2003 The Eurographics Association.

关键词： Extended Kalman filters

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A testbed for studying and choosing predictive tracking algorithms in virtual environments

A testbed for studying and choosing predictive tracking algo...

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9th EUROGRAPHICS Workshop on Virtual Environments, EGVE 2003

作者： LaViola Jr., Joseph J. Brown University Technology Center for Advanced Scientific Computing and Visualization PO Box 1910 Providence RI 02912 United States

ISBN: (纸本)1581136862

We present a testbed for comparing predictive tracking algorithms that allows virtual environment system developers to make better choices about which predictors to use in their environments and aids researchers in determining how predictors work across various virtual environment configurations. Our testbed saves the virtual environment developer and researcher both time and effort with the important task of reducing dynamic tracking error and masking latency. The testbed consists of three components: a prediction algorithm library, a motion data repository, and a graphical testing application which provides users with the ability to test different predictive tracking algorithms across a variety of user motion sequences. The testbed provides enough generality for testing across different algorithmic and system parameters such as sampling rate, prediction time, and noise variance. The paper describes the contents of the predictor library and how to extend it, the types of motion data sets collected thus far, the motion data preparation methodology, and the graphical testing application's functionality and architecture. A simple testing scenario showing output from the testbed is also presented. © 2003 The Eurographics Association.

关键词： Testbeds

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Mobile ADVICE: An accessible device for visually impaired capability enhancement

Mobile ADVICE: An accessible device for visually impaired ca...

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Conference on Human Factors in computing Systems, CHI EA 2003

作者： Amar, Robert Dow, Steven Gordon, Richard Hamid, Muhammad Raafay Sellers, Chad Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology 801 Atlantic Drive NW Atlanta GA 30332-0280 United States

ISBN: (纸本)1581136374

The visually impaired have limited access to the world of mobile devices. Our goal was to design a handheld mobile device to overcome limitations such as reliance on visual display and lack of audio and tactile feedback. We built a prototype handheld device using a combination of tactile feedback and auditory display based on preliminary research and testing. Our hypothesis was that this device would provide users with an interface with which they would be able to access advanced functions of a mobile device. This prototype was evaluated by both blind and sighted users. Based on both quantitative and qualitative measures, the results suggest that such a device can enhance the capabilities of visually impaired users of handheld mobile devices.

关键词： Display devices

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