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25th SIGCHI conference on Human Factors in Computing Systems 2007, CHI 2007

作者： Ballagas, Rafael A. Kratz, Sven G. Borchers, Jan Yu, Eugen Walz, Steffen P. Fuhr, Claudia O. Hovestadt, Ludger Tann, Martin Media Computing Group RWTH Aachen University 52056 Aachen Germany Media Computing Group RWTH Aachen University Germany ETH Zurich 8093 Zurich Switzerland Department for CAAD ETH Zurich Switzerland

ISBN: (纸本)1595936424

REXplorer is a mobile, pervasive spell-casting game designed for tourists of Regensburg, Germany. the game uses location sensing to create player encounters with spirits (historical figures) that are associated with historical buildings in an urban setting. A novel mobile interaction mechanism of "casting a spell" (making a gesture by waving a mobile phone through the air) allows the player to awaken and communicate with a spirit to continue playing the game. the game is designed to make learning history fun for young (and young at heart) tourists and influence their path through the city.

关键词： Interactive computer graphics

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Continuing motivation for game design

Continuing motivation for game design

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25th SIGCHI conference on Human Factors in Computing Systems 2007, CHI 2007

作者： Walter, Sarah E. Forssell, Karin Barron, Brigid Martin, Caitlin School of Education Stanford University Stanford CA 94305 United States Stanford Center for Innovations in Learning Stanford University Stanford CA 94305 United States

ISBN: (纸本)1595936424

In this paper we share experiences from a 2-week game-design project using the introductory programming environment AgentSheets with middle school students (6-8 grades) during a summer computing course at a public middle school in northern California. We examine factors that influence students. desire to continue working with the software, looking at similarities and differences between boys and girls, students with high or low levels of prior experience, and variables which we hypothesize might contribute to continuing motivation. Our findings suggest that programming in the context of game design can be of interest to a broad range of students, not only those who already are engaged in technological activities.

关键词： Interactive computer graphics

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Encouraging contribution to shared sketches in brainstorming meetings

Encouraging contribution to shared sketches in brainstorming...

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25th SIGCHI conference on Human Factors in Computing Systems 2007, CHI 2007

作者： Bastéa-Forte, Marcello Yen, Corina Computer Science Stanford University United States Mechanical Engineering Stanford University United States

ISBN: (纸本)1595936424

Brainstorming in small design groups typically involves one person taking notes and sketching at a whiteboard while other group members remain seated and contribute verbally. We believe that lowering the threshold for shared sketching improves idea generation from all members and supports building off the ideas of other members. We have designed and completed preliminary testing of a collaborative sketching system that enables simultaneous contribution to and viewing of a shared canvas through individual devices (Tablet PCs) and a digital whiteboard. A pilot study indicates that such a system helps equalize sketching contribution within a group although it reduces total sketching of the group as a whole. this finding suggests that individual access to a shared sketching space has implications for the brainstorming process such as a greater awareness of the quality and the relative amount of individual idea contribution.

关键词： Drawing (graphics)

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theory and Practice of computer graphics 2007, TPCG 2007 - Eurographics UK Chapter proceedings: Celebrating 25 Years of the Eurographics UK Chapter

Theory and Practice of Computer Graphics 2007, TPCG 2007 - E...

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5th theory and Practice of computer graphics conference, TPCG 2007

ISBN: (纸本)9783905673630

the proceedings contain 31 papers. the topics discussed include: real-time fluid simulation coupled with cloth;the dynamic animation of ambulatory arthropods;stability analysis of filtered mass-spring systems;a distance hierarchy to detect collisions between deformable objects;perception-based lighting-by-example;simulating film grain using the noise-power spectrum;scanline edge-flag algorithm for antialiasing;advantages of allowing hexagonal pixels to be used as a boundary description format;speeding up isosurfacing: the matryoshka algorithm;an immersive granular material visualization system with haptic feedback;bifocal radial visualization of intranet search results using image caching;a statistically-assisted sketch-based interface for creating arbitrary 3-dimensional faces;delivering effective and usable interactive 3D visualization on lightweight mobile devices;and a novel control mechanism for distributed stream rendering.

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Stability analysis of filtered mass-spring systems

Stability analysis of filtered mass-spring systems

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5th theory and Practice of computer graphics conference, TPCG 2007

作者： Ahmad, Alexandre Adly, Samir Terraz, Olivier Ghazanfarpour, Djamchid University of Limoges XLIM UMR CNRS 6172 France

ISBN: (纸本)9783905673630

Mass-spring systems simulations rely on the numerical integration method used for solving the resulting ordinary differential equations. Implicit schemes, which solve such equations, are unconditionally stable and are thus widely used. Part of this stability is due to force filtering which is inherent to the implicit formulation and is referred to artificial damping. We extract this artificial damping and we analyse frequencies. this analysis enables us to define a non arbitrary damping value and a stability criterion in accordance to filtering. this directly comes from a decrease of velocity vectors' eigenvalues resulting in an increase of the time step in the same proportion. Moreover we applied a simple filtering model reproducing artificial damping to explicit schemes and results reveal an increase of the time step. Implementation of this method is straightforward for existing physically based simulators. Applications to cloth and fish animations are presented. © the Eurographics Association 2007.

关键词： Stability criteria

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Implementation of interactive poster "suiPo"

Implementation of interactive poster "suiPo"

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25th SIGCHI conference on Human Factors in Computing Systems 2007, CHI 2007

作者： Tsunoda, Fuminori Matsumoto, Takayuki Nakagawa, Takeshi Utsunomiya, Mariko East Japan Railway 2-0 Nisshin cho Saitama-shi Saitama 331-8513 Japan

ISBN: (纸本)1595936424

this paper explains an implementation of new media "SuiPo," or Suica Poster, which uses a combination of IC card ticket "Suica" and Internet accessible mobile phone. Customers can get e-mail information by touching their IC card ticket on the reader located near the poster. Two pilot tests are conducted before the service has begun. the first test revealed that many people preferred the interactive poster but the registration process was complicated. the second test was conducted after improving the registration process. the lessons learned through two pilot tests are that in addition to the easier registration process, the increased popularity of two dimensional barcode reader in mobile phone has lowered the barrier of registration process. the SuiPo has been introduced in July 31st, 2006 and started service at Shinjuku Station and Tokyo Station. We hope the implementation would change customers' perception of Suica not only as a ticket or e-money but also as an information tool.

关键词： Interactive computer graphics

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Interactive exploration of city maps with auditory torches

Interactive exploration of city maps with auditory torches

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25th SIGCHI conference on Human Factors in Computing Systems 2007, CHI 2007

作者： Heuten, Wilko Henze, Niels Boll, Susanne OFFIS Escherweg 2 Oldenburg Germany University of Oldenburg Escherweg 2 Oldenburg Germany

ISBN: (纸本)1595936424

City maps are an important means to get an impression of the structure of cities. they represent visual abstraction of urban areas with different geographic entities, their locations, and spatial relations. However, this information is not sufficiently accessible today to blind and visually impaired people. To provide a non-visual access to map information, we developed an interactive auditory city map, which uses 3D non-speech sound to convey the position, shape, and type of geographic objects. For the interactive exploration of the auditory map, we designed a virtual walk-through. this allows the user to gain an overview of an area. To be able to focus on certain regions of the map, we equip the user with an auditory torch. With the auditory torch users can change the number of displayed objects in a self directed way. To further aid in getting a global idea of the displayed area we additionally introduce a bird's eye view on the auditory map. Our evaluation shows that our approaches enable the user to gain an understanding of the explored environment.

关键词： Interactive computer graphics

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A generalized contact model for nonlinear dynamic analysis of floating offshore systems

A generalized contact model for nonlinear dynamic analysis o...

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25th International conference on Offshore Mechanics and Arctic Engineering, OMAE 2006

作者： Da Silva, Danilo Machado Lawinscky Corrêa, Fabrício Nogueira Jacob, Breno Pinheiro LAMCSO - Laboratory of Computer Methods and Offshore Systems PEC/COPPE/UFRJ Rio de Janeiro RJ Brazil

ISBN: (纸本)0791837777

the objective of this work is to present the implementation of a contact model that represents, during a nonlinear dynamic analysis of floating offshore systems, the contact of lines with the platform, as well as the contact involving different lines and, eventually, involving two different platforms in the same model. Traditional contact models consider for instance a generalized scalar element, consisting of two nodes linked by a non-linear gap spring. In this work, the contact model is geometrically defined by volumes that cannot interpenetrate. A penetration stiffness can be defined for each volume;lateral friction can also be considered by this model. An appropriate data structure is used to define the volumes and guarantee the efficiency of the algorithm by an optimized search. the application of the presented contact model is demonstrated by case studies of actual applications for offshore systems: pipelines in S-Lay installation operations, where the contact is complex, specified only in some points of the ramp and stinger;offloading floating hoses that may collide with the hull of the ship, and catlines in lift operations. Copyright © 2006 by ASME.

关键词： Offshore structures

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Real-time rigid body simulation for haptic interactions based on contact volume of polygonal objects

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computer graphics FORUM 2004年第3期23卷 529-538页

作者： Hasegawa, S Sato, M Tokyo Inst Technol Tokyo 152 Japan

this paper proposes a new method for real-time rigid body simulations for haptic interactions based on a penalty method regarding contact volume. Analytical methods for calculation of contact forces require too much time to maintain fast update rates for haptic controls. In addition, they prohibit direct connection of haptic interfaces. Penalty methods, which employ spring-damper models for calculation of contact forces, offer a very rapid rate of iterations. In addition, they permit direct connection of haptic interfaces. Penalty methods are good for haptic interactions. However previous penalty methods do not regard distribution of contact forces over the contact area. For that reason, they can't calculate normal and friction forces on face-face contacts correctly. We propose a distributed spring-damper model on a contact area to solve these problems. We analyze three-dimensional geometries of the intersecting portion on the polyhedral objects. then, we integrate forces and torques of distributed spring-damper models. We implement a proposed simulator and compare it with a point-based penalty method and constraint method. the comparison shows that the proposed simulator improves accuracy of the simulation of face-face contact and firiction forces and the simulation speed. In addition, we attach a six degree-of-freedom (6-DOF) haptic interface to the simulator Users can feel 6-DOF force feedback and input 6-DOF motions.

关键词： computer simulation Polygonal numbers Touch Virtual reality computer graphics

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computer simulation of prostate resection for surgery training

Computer simulation of prostate resection for surgery traini...

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25th Annual International conference of the IEEE-Engineering-in-Medicine-and-Biology-Society

作者： Castañeda, MAP Cosío, FA Univ Nacl Autonoma Mexico CCADET Image & Vis Lab Mexico City 04510 DF Mexico

ISBN: (纸本)0780377893

During a Transurethral Resection of the Prostate (TURP), a surgeon removes the inner prostate tissue that obstructs the urinary flow. In this minimally invasive procedure, the novice surgeons must perform hundreds of training, sessions before acquiring the skills needed. In this paper we present a three-dimensional (3D) computer model of the prostate for TURP simulation. the prostate model is designed to be the basis of a computer simulator for TURP training. the model was built from a set of ultrasound images with a technique that constructs a 3D volumetric mesh of the prostate shape. We used a set of ultrasound images with the prostate contour automatically annotated, using a point distribution model of the prostate which is adjusted by a genetic algorithm. A mass-spring method is used to model tissue deformation due to surgical tool interaction. the model simulates, in real-time: resections;tissue deformations and the cavity produced by the user as the surgical procedure progresses.

关键词： deformable models prostate prostatectomy surgery simulation surgery training systems

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