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Third Asian Simulation Conference, Asiasim 2004

作者： Choi, Yoo-Joo Kim, Young J. Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans Univesity Seoul Korea Republic of

This paper presents an efficient self-collision detection algorithm for deformable body simulation using programmable graphics processing units (GPUs). The proposed approach stores a triangular mesh representation of a deformable model as ID textures and rapidly detects self-collisions between all pairs of triangular primitives using the programmable SIMD capability of GPUs [1]. Since pre-computed spatial structure such as bounding volume hierarchy is not used in our algorithm, our algorithm does not require expensive runtime updates to such complex structure as the underlying model deforms. Moreover, in order to overcome a potential bottleneck between CPU and GPU, we propose a hierarchical encoding/decoding scheme using multiple off-screen buffers and multi-pass rendering techniques, which reads only a region of interests in the resulting off-screen buffer. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Algorithms

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Collaborative and immersive medical education in a virtual workbench environment

Collaborative and immersive medical education in a virtual w...

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9th International Conference on Knowledge-Based Intelligent Information and Engineering Systems, KES 2005

作者： Choi, Yoo-Joo Choi, Soo-Mi Rhee, Seon-Min Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of School of Computer Engineering Sejong University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans Univesity Seoul Korea Republic of

ISBN: (纸本)3540288961

In this paper we introduce a framework for an advanced medical education in a table-type VR environment, which is based on an efficient deformable modeling for the interactive manipulation of soft tissues and a realistic motion simulation for dynamic human organs. The proposed framework includes two data storages with 3D/4D models and the 2D anatomic information, and various functional modules that are used to effectively explain human organs by visualizing and synchronizing with the components in the data storages. In our VR environment, a table-type virtual workbench is effectively used for the collaborative and realistic presentation to a group of learners and the video-based tracking environment provides the convenience for a user to select and to manipulate a subject of learning. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Medical education

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Illustrative visualization

Illustrative visualization

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VIS 05: IEEE Visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： Visualization

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ONE-TO-ONE TECHNOLOGY-ENHANCED LEARNING: AN OPPORTUNITY FOR GLOBAL RESEARCH COLLABORATION

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Research and Practice in Technology Enhanced Learning 2006年第1期1卷 3-29页

作者： TAK-WAI CHAN JEREMY ROSCHELLE SHERRY HSI KINSHUK MIKE SHARPLES TOM BROWN CHARLES PATTON JOHN CHERNIAVSKY ROY PEA CATHIE NORRIS ELLIOT SOLOWAY NICOLAS BALACHEFF MARLENE SCARDAMALIA PIERRE DILLENBOURG CHEE-KIT LOOI MARCELO MILRAD ULRICH HOPPE Research Center for Science and Technology for Learning National Central University 300 Jhongda Road Jhongli City 32001 Taiwan ROC Center for Technology in Learning SRI International 333 Ravenswood Ave BN-376 Menlo Park California 94025 USA Center for Learning and Teaching The Exploratorium 3601 Lyon Street San Francisco California 94123 USA Advanced Learning Technologies Research Centre Massey University Private Bag 11-222 Palmerston North New Zealand Learning Sciences Research Institute Nottingham University Jubilee Campus Wollaton Road Nottingham NG8 1BB UK University of Pretoria Telematic Learning & Education Innovation Lynnwood Road Hillcrest Pretoria South Africa 0002 South Africa National Science Foundation 4201 Wilson Boulevard Arlington Virginia 22230 USA Stanford Center for Innovations in Learning Stanford University Wallenberg Hall Building 160 450 Serra Mall Stanford CA 94305-205 USA Department of Cognition and Technology University of North Texas Matthews Hall 316-D PO Box 311337 Denton TX 76203-1337 USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA Laboratoire Leibniz 46 Avenue Félix Viallet 38031 Grenoble Cedex France Institute for Knowledge Innovation and Technology OISE/University of Toronto 252 Bloor Street West Toronto Ontario M5S 1V6 Canada Swiss Federal Institute of Technology Ecole Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland Learning Sciences Lab National Institute of Education Nanyang Technological University 1 Nanyang Walk Singapore 637616 Singapore Center for Learning and Knowledge Technologies Växjö University MSI Växjö University Vejdes plats 6 och 7 351 95 Växjö Sweden Institute for Computer Science and Interactive Systems University Duisburg-Essen Building LF Lotharstr. 63/65 47048 Duisburg Germany

Over the next 10 years, we anticipate that personal, portable, wirelessly-networked technologies will become ubiquitous in the lives of learners — indeed, in many countries, this is already a reality. We see that ready-to-hand access creates the potential for a new phase in the evolution of technology-enhanced learning (TEL), characterized by "seamless learning spaces" and marked by continuity of the learning experience across different scenarios (or environments), and emerging from the availability of one device or more per student ("one-to-one"). One-to-one TEL has the potential to "cross the chasm" from early adopters conducting isolated design studies to adoption-based research and widespread implementation, with the help of research and evaluation that gives attention to the digital divide and other potentially negative consequences of pervasive computing. We describe technology-enhanced learning and the affordances of one-to-one computing and outline a research agenda, including the risks and challenges of reaching scale. We reflect upon how this compares with prior patterns of technology innovation and diffusion. We also introduce a community, called "G1:1," that brings together leaders of major research laboratories and one-to-one TEL projects. We share a vision of global research, inviting other research groups to collaborate in ongoing activities.

关键词： Technology-enhanced learning research collaboration pervasive computing wireless technologies

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Dynamic maps for long-Term operation of mobile service robots

Dynamic maps for long-Term operation of mobile service robot...

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International Conference on Robotics: science and Systems, RSS 2005

作者： Biber, Peter Duckett, Tom Graphical-Interactive Systems Wilhelm Schickard Institute for Computer Science University of Tübingen Germany AASS Research Center Department of Technology Örebro University Sweden

ISBN: (纸本)9780262701143

This paper introduces a dynamic map for mobile robots that adapts continuously over time. It resolves the stabilityplasticity dilemma (the trade-off between adaptation to new patterns and preservation of old patterns) by representing the environment over multiple timescales simultaneously (5 in our experiments). A sample-based representation is proposed, where older memories fade at different rates depending on the timescale. Robust statistics are used to interpret the samples. It is shown that this approach can track both stationary and non-stationary elements of the environment, covering the full spectrum of variations from moving objects to structural changes. The method was evaluated in a five week experiment in a real dynamic environment. Experimental results show that the resulting map is stable, improves its quality over time and adapts to changes. © 2005 Massachusetts Institute of Technology.

关键词： Mobile robots

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Floor interaction hci reaching new ground

Floor interaction hci reaching new ground

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Conference on Human Factors in Computing Systems, CHI EA 2005

作者： Petersen, Marianne Graves Krogh, Peter Gall Ludvigsen, Martin Lykke-Olesen, Andreas Center for Interactive Spaces Department of Computer Science University of Aarhus Abogade 34 DK-8200 Arhus N Denmark Center for Interactive Spaces Aarhus School of Architecture Nørreport 20 DK-8000 Arhus C Denmark

ISBN: (纸本)1595930027

Within architecture, there is a long tradition of careful design of floors. The design has been concerned with both decorating floors and designing floors to carry information. Ubiquitous computing technology offers new opportunities for designing interactive floors. This paper presents threedifferent interactive floor concepts. Through an urban perspective it draws upon the experiences of floors in architecture, and provides a set of design issues for designing interactive floors.

关键词： Floors

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Ecce homology 05

Ecce homology

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International Conference on computer graphics and interactive Techniques, SIGGRAPH 2005

作者： West, Ruth Burke, Jeff Kerfeld, Cheryl Mendelowitz, Eitan Holton, Thomas Lewis, J.P. Drucker, Ethan Yan, Weihong Lamont, Steve McQuade, Loren Lee, David National Center for Microscopy and Imaging Research UCSD United States UCLA HyperMedia Studio United States UCLA DOE Center for Genomics and Proteomics United States UCLA Department of Computer Science United States USC Computer Graphics and Immersive Technology Laboratory IMSC United States UCLA Bioinformatics User Facility United States

ISBN: (纸本)9781450378291

Ecce Homology, a physically interactive new-media work, visualizes genetic data as calligraphic forms. A novel computervision based user interface allows multiple participants, through their movement in the installation space, to select genes from the human genome for visualizing the Basic Local Alignment Search Tool (BLAST), a primary algorithm in comparative genomics.

关键词： User interfaces

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Mixed interaction space- Designing for camera based interaction with mobile devices

Mixed interaction space- Designing for camera based interact...

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Conference on Human Factors in Computing Systems, CHI EA 2005

作者： Hansen, Thomas Riisgaard Eriksson, Eva Lykke-Olesen, Andreas Center for Pervasive Healthcare Department of Computer Science University of Aarhus Aabogade 34 DK8200 Aarhus N Denmark Interactive Spaces ISIS Katrinebjerg Department of Computer Science University of Aarhus Aabogade 34 DK8200 Aarhus N Denmark Department of Design Aarhus School of Architecture Nørreport 20 DK8000 Aarhus C Denmark

ISBN: (纸本)1595930027

In mobile devices, such as mobile phones and PDAs, an integrated camera can be used to interact with the device in new ways. In this paper we introduce the term mixed interaction space and argue that the possibility of using mixed interaction spaces is what distinguishes camera-based interaction from other types of sensor-based interaction on mobile devices. We present our implemented applications, and related work that use mixed interaction spaces. Based on this we address how mixed interaction spaces can have different identities, be mapped to applications, and how it can be visualized.

关键词： Augmented reality

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Synthesizing speech animation by learning compact speech co-articulation models

Synthesizing speech animation by learning compact speech co-...

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computer graphics International

作者： Z. Deng J.P. Lewis U. Neumann Computer Graphics and lmmersive Technologies Lab Department of Computer Science. Integrated Media System Center University of Southern California USA

While speech animation fundamentally consists of a sequence of phonemes over time, sophisticated animation requires smooth interpolation and co-articulation effects, where the preceding and following phonemes influence the shape of a phoneme. Co-articulation has been approached in speech animation research in several ways, most often by simply smoothing the mouth geometry motion over time. Data-driven approaches tend to generate realistic speech animation, but they need to store a large facial motion database, which is not feasible for real time gaming and interactive applications on platforms such as PDAs and cell phones. In this paper we show that accurate speech co-articulation model with compact size can be learned from facial motion capture data. An initial phoneme sequence is generated automatically from text-to-speech (TTS) systems. Then, our learned co-articulation model is applied to the resulting phoneme sequence, producing natural and detailed motion. The contribution of this work is that speech co-articulation models "learned" from real human motion data can be used to generate natural-looking speech motion while simultaneously preserving the expressiveness of the animation via keyframing control. Simultaneously, this approach can be effectively applied to interactive applications due to its compact size.

关键词： Speech synthesis Interpolation Shape Smoothing methods Mouth Geometry Facial animation Spatial databases Personal digital assistants Cellular phones

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Touching Remote Mixed Worlds : Simulation & Reality

Touching Remote Mixed Worlds : Simulation & Reality

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Asian Simulation Conference/The 6th International conference on system Simulation and Scientific Computing

作者： Myoung-Hee Kim Director Center for Computer Graphics and Virtual Reality Professor Department of Computer Science and Engineering Ewha Womans University Seoul Korea Prof.

As virtual environment technology becomes accessible and affordable, there has been an increase in constructing and connecting virtual worlds. Networked virtual environments allow us to meet and interact with people even though they may be located in different parts of the world. It has been employed in many simulative applications such as manufacturing, business, education, medicine and so on. Networked virtual environment can be more realistic and powerful by applying mixed reality technology merging real and virtual worlds. Focusing on the theme about building and connecting mixed worlds, technical issues are analyzed in terms of data acquisition, visualization, interaction, network communication, and so on. Exploring related work of many research laboratories, future possibilities are also discussed.

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