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1st International Symposium on Handheld and Ubiquitous computing, HUC 1999

作者： Abowd, Gregory D. Dey, Anind K. Brown, Peter J. Davies, Nigel Smith, Mark Steggles, Pete Visualization and Usability Center College of Computing Georgia Tech AtlantaGA United States Computing Lab. The University of Kent at Canterbury Canterbury Kent United Kingdom Computing Dept. Engineering Building Lancaster University Lancaster United Kingdom Hewlett Packard Laboratories Palo AltoCA United States AT and T Laboratories Cambridge 24a Trumpington Street Cambridge United Kingdom

ISBN: (纸本)3540665501

When humans talk with humans, they are able to use implicit situational information, or context, to increase the conversational bandwidth. Unfortunately, this ability to convey ideas does not transfer well to humans interacting with computers. In traditional interactive computing, users have an impoverished mechanism for providing input to computers. By improving the computer’s access to context, we increase the richness of communication in human-computer interaction and make it possible to produce more useful computational services. The use of context is increasingly important in the fields of handheld and ubiquitous computing, where the user?s context is changing rapidly. In this panel, we want to discuss some of the research challenges in understanding context and in developing context-aware applications.

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Implant sprays: compression of progressive tetrahedral mesh connectivity

Implant sprays: compression of progressive tetrahedral mesh ...

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IEEE Conference on visualization

作者： R. Pajarola J. Rossignac A. Szymczak GVU Center Georgia Institute of Technology College of Computing Georgia Institute of Technology Atlanta GA USA Graphics Visualization & Usability Center Georgia Institute of Technology USA

Irregular tetrahedral meshes, which are popular in many engineering and scientific applications, often contain a large number of vertices. A mesh of V vertices and T tetrahedra requires 48 V bits or less to store the vertex coordinates, 4/spl middot/T/spl middot/log/sub 2/(V) bits to store the tetrahedra-vertex incidence relations, also called connectivity information, and kV bits to store the k-bit value samples associated with the vertices. Given that T is 5 to 7 times larger than V and that V often exceeds 32/sup 3/, the storage space required for the connectivity is larger than 300 V bits and thus dominates the overall storage cost. Our "implants spray" compression approach introduced in the paper reduces this cost to about 30 V bits or less-a 10:1 compression ratio. Furthermore, implant spray supports the progressive refinement of a crude model through a series of vertex-splits operations.

关键词： Implants Spraying Costs Encoding Solid modeling Graphics visualization Usability Chromium Computational geometry

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Implant sprays: compression of progressive tetrahedral mesh connectivity 99

Implant sprays: compression of progressive tetrahedral mesh ...

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Proceedings of the conference on visualization '99: celebrating ten years

作者： Renato Pajarola Jarek Rossignac Andrzej Szymczak GVU Center College of Computing 801 Atlantic Dr. Georgia Institute of Technology Atlanta GA Graphics Visualization & Usability Center Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9780780358973

Irregular tetrahedral meshes, which are popular in many engineering and scientific applications, often contain a large number of vertices. A mesh of V vertices and T tetrahedra requires 48·V bits or less to store the vertex coordinates, 4·Vlog2 bits to store the tetrahedra-vertex incidence relations, also called connectivity information, and k·V bits to store the k-bit value samples associated with the vertices. Given that T is 5 to 7 times larger than V and that V often exceeds 323, the storage space required for the connectivity is larger than 300·V bits and thus dominates the overall storage cost. Our “implants spray” compression approach introduced in this paper reduces this cost to about 30·V bits or less — a 10:1 compression ratio. Furthermore, implant spray supports the progressive refinement of a crude model through a series of vertex-splits operations.

关键词： compression

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A review of tele-immersive applications in the CAVE research network

A review of tele-immersive applications in the CAVE research...

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IEEE Annual International Symposium Virtual Reality

作者： J. Leigh A.E. Johnson T.A. DeFanti M. Brown M.D. Ali S. Bailey A. Banerjee P. Benerjee Jim Chen K. Curry J. Curtis F. Dech B. Dodds I. Foster S. Fraser K. Ganeshan D. Glen R. Grossman R. Heiland J. Hicks A.D. Hudson T. Imai M.A. Khan A. Kapoor R.V. Kenyon J. Kelso R. Kriz C. Lascara X. Liu Y. Lin T. Mason A. Millman K. Nobuyuki K. Park B. Parod P.J. Rajlich M. Rasmussen M. Rawlings D.H. Robertson S. Thongrong R.J. Stein K. Swartz S. Tuecke H. Wallach Hong Yee Wong G.H. Wheless National Center for Supercomputing Applications University슠of슠Illinois Urbana-Champaign USA Electronic Visualization Laboratory University of Illinois Chicago USA National Center for Data-Mining University of Illinois Chicago USA Industrial Virtual Reality Laboratory University of Illinois Chicago USA Northwestern University USA Virginia Tech Antenna Group USA Searle Argonne National Laboratory USA Purdue University Indiana University USA Center for Coastal Physical Oceanography Old Dominion University USA Institute of High Performance Computing National University of Singapore Singapore Virtual Reality in Medicine Laboratory University of Illinois Chicago USA Tohwa University Japan

This paper presents an overview of the tele-immersion applications that have been built by collaborators around the world using the CAVERNsoft toolkit, and the lessons learned from building these applications. In particular the lessons learned are presented as a set of rules-of-thumb for developing tele-immersive applications in general.

关键词： Intelligent networks Laboratories visualization Virtual reality Collaborative work Virtual environment Image databases Industrial training Computer networks Sea measurements

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A methodology for the evaluation of travel techniques for immersive virtual environments

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Virtual Reality 1998年第2期3卷 120-131页

作者： Bowman, D.A. Koller, D. Hodges, L.F. College of Computing Graphics Visualization and Usability Center Atlanta GA United States College of Computing Graphics Visualization and Usability Center Atlanta CA 30332-0280 801 Atlantic Drive United States

We present a framework for the analysis and evaluation of travel, or viewpoint motion control, techniques for use in immersive virtual environments (VEs). In previous work, we presented a taxonomy of travel techniques and a set of experiments mapping parts of the taxonomy to various performance metrics. Since these initial experiments, we have expanded the framework to allow evaluation of not only the effects of different travel techniques, but also the effects of many outside factors simultaneously. Combining this expanded framework with the measurement of multiple response variables epitomises the philosophy of testbed evaluation. This experimental philosophy leads to a deeper understanding of the interaction and the technique(s) in question, as well as to broadly generalisable results. We also present an example experiment within this expanded framework, which evaluates the user's ability to gather information while travelling through a virtual environment. Results indicate that, of the variables tested, the complexity of the environment is by far the most important factor. © Springer-Verlag London Ltd.

关键词： Evaluation information gathering Interaction techniques Virtual environments

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Enhancing interfaces with animated widgets 6

Enhancing interfaces with animated widgets

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6th Annual Tcl/Tk Conference, TCL/TK 1998

作者： Scott McCrickard, D. Graphics Visualization and Usability Center College of Computing AtlantaGA30332 United States

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Application experiences with the Globus toolkit 98

Application experiences with the Globus toolkit

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International Symposium on High Performance Distributed computing

作者： S. Brunett K. Czajkowski S. Fitzgerald I. Foster A. Johnson C. Kesselman J. Leigh S. Tuecke Center for Advanced Computing Research California Institute of Technology NASA Pasadena CA USA Electronic Visualization Lab University of Illinois Chicago IL USA Information Sciences Institute University of Southern California Marina del Rey CA USA Mathematics and Computer Science Argonne National Laboratory Argonne IL USA

ISBN: (纸本)9780818685798

The development of applications and tools for high-performance "computational grids" is complicated by the heterogeneity and frequently dynamic behavior of the underlying resources; by the complexity of the applications themselves, which often combine aspects of supercomputing and distributed computing; and by the need to achieve high levels of performance. The Globus toolkit has been developed with the goal of simplifying this application development task, by providing implementations of various core services deemed essential for high-performance distributed computing. In this paper, we describe two large applications developed with this toolkit: a distributed interactive simulation and a teleimmersion system. We describe the process used to develop the applications, review the lessons learned and draw conclusions regarding the effectiveness of the toolkit approach.

关键词： Resource management Application software Distributed computing Pervasive computing Testing Computer architecture Service oriented architecture Authentication Information security Computer interfaces

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Java-based user interface development

Java-based user interface development

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Conference on Human Factors in computing Systems, CHI EA 1997

作者： Smith, Ian Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States

This tutorial provide attendees with an understanding of the possibilities provided by the World Wide Web for application development and a more detailed understanding of the issues involved in developing user interfa... 详细信息

ISBN: (纸本)0897919262

关键词： World Wide Web

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Supporting student-built algorithm animation as a pedagogical tool

Supporting student-built algorithm animation as a pedagogica...

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Conference on Human Factors in computing Systems, CHI EA 1997

作者： Stasko, John T. Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States

ISBN: (纸本)0897919262

This demonstration describes a new approach to algorithm animation, one in which the students construct the animations. We introduce the Samba system that facilitates this process and describe how it has been used an undergraduate algorithms courses as a teaching aid. Having students build the animations, that is, construct the mapping from concepts to images, appears to enable true understanding of the algorithm under study.

关键词： Animation

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An evaluation of techniques for grabbing and manipulating remote objects in immersive virtual environments 97

An evaluation of techniques for grabbing and manipulating re...

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Proceedings of the 1997 symposium on Interactive 3D graphics

作者： Doug A. Bowman Larry F. Hodges Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology 801 Atlantic Drive Atlanta GA and Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology

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