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Particle-based sampling and meshing of surfaces in multimaterial volumes

Particle-based sampling and meshing of surfaces in multimate...

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作者： Meyer, Miriah Whitaker, Ross Kirby, Robert M. Ledergerber, Christian Pfister, Hanspeter Initiative in Innovative Computing Harvard University Scientific Computing and Imaging Institute University of Utah

Methods that faithfully and robustly capture the geometry of complex material interfaces in labeled volume data are important for generating realistic and accurate visualizations and simulations of real-world objects. The generation of such multimaterial models from measured data poses two unique challenges: first, the surfaces must be well-sampled with regular, efficient tessellations that are consistent across material boundaries;and second, the resulting meshes must respect the nonmanifold geometry of the multimaterial interfaces. This paper proposes a strategy for sampling and meshing multimaterial volumes using dynamic particle systems, including a novel, differentiate representation of the material junctions that allows the particle system to explicitly sample corners, edges, and surfaces of material intersections. The distributions of particles are controlled by fundamental sampling constraints, allowing Delaunay-based meshing algorithms to reliably extract watertight meshes of consistently high-quality. © 2008 IEEE.

关键词： Visualization

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System design for the WeSpace: Linking personal devices to a table-centered multi-user, multi-surface environment

System design for the WeSpace: Linking personal devices to a...

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2008 IEEE International Workshop on Horizontal Interactive Human Computer System, TABLETOP 2008

作者： Jiang, Hao Wigdor, Daniel Forlines, Clifton Shen, Chia Initiative in Innovative Computing Harvard University Tsinghua University Microsoft Surface Mitsubishi Electric Research Labs.

ISBN: (纸本)9781424428984

The WeSpace is a long-term project dedicated to the creation of environments supporting walk-up and share collaboration among small groups. The focus of our system design has been to provide 1) groups with mechanisms to easily share their own data and 2) necessary native visual applications suitable on large display environments. Our current prototype system includes both a large high-resolution data wall and an interactive table. These are utilized to provide a focal point for collaborative interaction with data and applications. In this paper, we describe in detail the designs behind the current prototype system. In particular, we present 1) the infrastructure which allows users to connect and visually share their laptop content on-the-fly, and supports the extension of native visualization applications, and 2) the table-centric design employed in customized WeSpace applications to support cross-surface interactions. We will also describe elements of our user-centered iterative design process, in particular the results from a late-stages session which saw our astrophysicist participants successfully use the WeSpace to collaborate on their own real research problems. © 2008 IEEE.

关键词： Systems analysis

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Event discovery in time series

Event discovery in time series

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9th SIAM International Conference on Data Mining 2009, SDM 2009

作者： Preston, Dan Protopapas, Pavlos Brodley, Carla Initiative in Innovative Computing Harvard University United States Harvard-Smithsonian Center for Astrophysics United States Department of Computer Science Tufts University United States

ISBN: (纸本)9781615671090

The discovery of events in time series can have important implications, such as identifying microlensing events in astronomical surveys, or changes in a patient's electrocardiogram. Current methods for identifying events require a sliding window of a fixed size, which is not ideal for all applications and could overlook important events. In this work, we develop probability models for calculating the significance of an arbitrary-sized sliding window and use these probabilities to find areas of significance. Because a brute force search of all sliding windows and all window sizes would be computationally intractable, we introduce a method for quickly approximating the results. We apply our method to over 100,000 astronomical time series from the MACHO survey, in which 56 different sections of the sky are considered, each with one or more known events. Our method was able to recover 100% of these events in the top 1% of the results, essentially pruning 99% of the data. Interestingly, our method was able to identify events that do not pass traditional event discovery procedures.

关键词： Time series

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Force gradient integrators 27

Force gradient integrators

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27th International Symposium on Lattice Field Theory, LAT 2009

作者： Kennedy, A.D. Clark, M.A. Silva, P.J. School of Physics and Astronomy University of Edinburgh United Kingdom Harvard-Smithsonian Center for Astrophysics and Initiative in Innovative Computing Harvard University School of Engineering and Applied Sciences United States

We present initial results of the use of Force Gradient integrators for lattice field theories. These promise to give significant performance improvements, especially for light fermions and large lattices. Our results show that this is indeed the case, indicating a speed-up of more than a factor of two, which is expected to increase as the integration step size becomes smaller for larger lattices and smaller fermion masses. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

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Frogs and Toads Memory: A Voronoi Twist on the Classic Children's Game

Frogs and Toads Memory: A Voronoi Twist on the Classic Child...

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International Symposium on Voronoi Diagrams in Science and Engineering (ISVD)

作者： Michael S. Horn Chia Shen Scientists' Discovery Room (SDR Lab) Initiative in Innovative Computing at Harvard University Cambridge MA USA

In this paper we present a novel twist on the classic children's game, Memory. Here we combine the use of a weighted, centroidal Voronoi diagram and a multi-touch tabletop surface to create a board game in which tiles (represented with Voronoi regions) dynamically morph as the game play evolves. This provides a challenge in which players must not only remember the locations of the various tiles, but also track their movements over time. Ages: 3 - 99 Players: 1 or more.

关键词： Tiles Displays Fingers Tracking Collaboration Facial animation Image databases Audio recording Shape Java

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Visualizing Biodiversity with Voronoi Treemaps

Visualizing Biodiversity with Voronoi Treemaps

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International Symposium on Voronoi Diagrams in Science and Engineering (ISVD)

作者： Michael S. Horn Matthew Tobiasz Chia Shen Scientists Discovery Room (SDR Lab) Initiative in Innovative Computing Harvard University Cambridge MA USA

Introduced in 2005, the Voronoi treemap algorithm is an information visualization technique for displaying hierarchical data. Voronoi treemaps use weighted, centroidal Voronoi diagrams to create a nested tessellation of convex polygons. However, despite appealing qualities, few real world examples of Voronoi treemaps exist. In this paper, we present a multi-touch tabletop application called Involv that uses the Voronoi treemap algorithm to create an interactive visualization for the Encyclopedia of Life. Involv is the result of a year-long iterative development process and includes over 1.2 million named species organized in a nine-level hierarchy. Working in the domain of life sciences, we have encountered the need to display supplemental hierarchical data to augment information in the treemap. Thus we propose an extension of the Voronoi treemap algorithm that employs force-directed graph drawing techniques both to guide the construction of the treemap and to overlay a supplemental hierarchy.

关键词： Biodiversity Data visualization Tree graphs Phylogeny Encyclopedias Taxonomy Earth Displays Organisms Iterative algorithms

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QCD on GPUs: Cost effective supercomputing 27

QCD on GPUs: Cost effective supercomputing

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27th International Symposium on Lattice Field Theory, LAT 2009

作者： Clark, M.A. Harvard-Smithsonian Center for Astrophysics 60 Garden St CambridgeMA02138 United States Initiative in Innovative Computing Harvard University School of Engineering and Applied Sciences 29 Oxford St CambridgeMA02138 United States

The exponential growth of floating point power in graphics processing units (GPUs), together with their low cost, has given rise to an attractive platform upon which to deploy lattice QCD calculations. GPUs are essentially many (O(100)) core chips, that are programmed using a massively threaded environment, and so are representative of the future of high performance computing (HPC). The large ratio of raw floating point operations per second to memory bandwidth that is characteristic of GPUs necessitates that unique algorithmic design choices are made to harness their full potential. We review the progress to date in using GPUs for large scale calculations, and contrast GPUs against more traditional HPC architectures. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Graphics processing unit

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System design for the WeSpace: Linking personal devices to a table-centered multi-user, multi-surface environment

System design for the WeSpace: Linking personal devices to a...

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IEEE International Workshop on Horizontal Interactive Human-Computer Systems (TABLETOP)

作者： Hao Jiang Daniel Wigdor Clifton Forlines Chia Shen Tsinghua University China Initiative in Innovative Computing Harvard University USA Microsoft Surface Mitsubishi Electric Research Laboratories

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Multiscale simulations of complex systems: Computation meets reality

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作者： Kaxiras, Efthimios Succi, Sauro Department of Physics School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 United States Istituto Applicazioni Calcolo CNR Viale del Policlinico 137 00161 Roma Italy Initiative in Innovative Computing Harvard University Cambridge MA 02138 United States

ISBN: (纸本)9781402097409

Multiscale simulations are evolving into a powerful tool for exploring the nature of complex physical phenomena. We discuss two representative examples of such phenomena, stress corrosion cracking and ultrafast DNA sequencing during translocation through nanopores, which are relevant to practical applications. Multiscale methods that are able to exploit the potential of massively parallel computer architectures, will offer unique insight into such complex phenomena. This insight can guide the design of novel devices and processes based on a fundamental understanding of the link between atomistic-scale processes and macroscopic behavior. © Springer Science+Business Media B.V. 2008.

关键词： DNA sequences

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The role of multigrid algorithms for LQCD 27

The role of multigrid algorithms for LQCD

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27th International Symposium on Lattice Field Theory, LAT 2009

作者： Babich, Ronald Brannick, James Brower, Richard C. Clark, Michael A. Cohen, Saul D. Osborn, James C. Rebbi, Claudio Center for Computational Science Boston University BostonMA02215 United States Department of Mathematics Pennsylvania State University University ParkPA16802 United States Department of Physics Boston University BostonMA02215 United States Harvard-Smithsonian Center for Astrophysics and Initiative in Innovative Computing Harvard University CambridgeMA02138 United States Argonne Leadership Computing Facility ArgonneIL60439 United States

We report on the first successful QCD multigrid algorithm which demonstrates constant convergence rates independent of quark mass and lattice volume for the Wilson Dirac operator. The new ingredient is the adaptive method for constructing the near null space on which the coarse grid multigrid Dirac operator acts. In addition we speculate on future prospects for extending this algorithm to the Domain Wall and Staggered discretizations, its exceptional suitability for high performance GPU code and its potential impact on simulations at the physical pion mass. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Domain walls

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