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检索条件"任意字段=Applied Computing 2004 - Proceedings of the 2004 ACM Symposium on Applied Computing"

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Real-time physical modelling of character movements with microsoft kinect 12

Real-time physical modelling of character movements with mic...

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18th acm symposium on Virtual Reality Software and Technology, VRST 2012

作者： Shum, Hubert P. H. Ho, Edmond S. L. School of Computing Engineering and Information Sciences Northumbria University Newcastle United Kingdom Department of Computer Science Hong Kong Baptist University Kowloon Tong Hong Kong

ISBN: (纸本)9781450314695

With the advancement of motion tracking hardware such as the Microsoft Kinect, synthesizing human-like characters with real-time captured movements becomes increasingly important. Traditional kinematics and dynamics approaches perform sub-optimally when the captured motion is noisy or even incomplete. In this paper, we proposed a unified framework to control physically simulated characters with live captured motion from Kinect. Our framework can synthesize any posture in a physical environment using external forces and torques computed by a PD controller. The major problem of Kinect is the incompleteness of the captured posture, with some degree of freedom (DOF) missing due to occlusions and noises. We propose to search for a best matched posture from a motion database constructed in a dimensionality reduced space, and substitute the missing DOF to the live captured data. Experimental results show that our method can synthesize realistic character movements from noisy captured motion. The proposed algorithm is computationally efficient and can be applied to a wide variety of interactive virtual reality applications such as motion-based gaming, rehabilitation and sport training. Copyright 2012 acm.

关键词： Virtual reality

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Simulation of deformable solids in interactive virtual reality applications 12

Simulation of deformable solids in interactive virtual reali...

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18th acm symposium on Virtual Reality Software and Technology, VRST 2012

作者： Tang, Wen Wan, Tao Ruan School of Computing University of Teesside Middlesbrough TS1 3BA United Kingdom School of Informatics University of Bradford Bradford BD7 1DP United Kingdom

ISBN: (纸本)9781450314695

Simulation of deformable objects has become indispensable in many virtual reality applications. Linear finite element algorithms are frequently applied in interactive physics simulation in order to ensure computational efficiency. However, there exists a variety of situations in which higher order simulation accuracy is expected to improve physical behaviors of deformable objects to match their real-world counterparts. For example in the context of virtual surgery, interactive surgical manipulations mandate algorithmic requirements to maintain both interactive frame rates and simulation accuracy, presenting major challenges in simulation methods. In this paper, we present an interactive system for efficient finite element based simulation of hyperplastic solids with more accurate physics behaviors compared with that of standard corotational methods. Our approach begins with a physics model to mitigate drawbacks of the corotational linear elasticity in preserving energy and momenta. A new damping model is presented which takes into account the differential of rotation to compensate the loss of momenta due to rotations. Thus, more accurate simulations can be achieved with this new model, whereas standard corotational methods using rotated damping to handle energy dissipation does not preserve momenta. We then present a real time simulation framework for computing finite element based deformable solids with full capability allowing complex objects to collide and interact with each other. A constrained system is also provided for robust control and the ease of use the simulation system. We demonstrate the parallel implementation to enable realistic and stable physics behaviors of large deformations capable of handling unpredictable user inputs in interactive virtual environments. The implementation details and insights on practical considerations in implementation such as our experience in parallel computation of the physics for mesh-based finite element objects would b

关键词： Virtual reality

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computing all maps into a sphere

Computing all maps into a sphere

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23rd Annual acm-SIAM symposium on Discrete Algorithms, SODA 2012

作者： Čadek, Martin Krčál, Marek Matoušek, Jiří Sergeraert, Francis Vokřínek, Lukáš Wagner, Uli Department of Mathematics and Statistics Masaryk University Kotlářská 2 611 37 Brno Czech Republic Department of Applied Mathematics Charles University Malostranské nám. 25 118 00 Praha 1 Czech Republic Charles University Malostranské nám. 25 118 00 Praha 1 Czech Republic Institute of Theoretical Computer Science ETH Zurich 8092 Zurich Switzerland Institut Fourier BP 74 38402 St Martin d'Hères Cedex France

ISBN: (纸本)9781611972108

We present an algorithm for computing [X, Y], i.e., all homotopy classes of continuous maps X → Y, where X, Y are topological spaces given as finite simplicial complexes, Y is (d - 1)-connected for some d ≥ 2 (for example, Y can be the d-dimensional sphere Sd), and dim X ≤ 2d - 2. These conditions on X, Y guarantee that [X, Y] has a natural structure of a finitely generated Abelian group, and the algorithm finds generators and relations for it. We combine several tools and ideas from homotopy theory (such as Postnikov systems, simplicial sets, and obstruction theory) with algorithmic tools from effective algebraic topology (objects with effective homology). We hope that a further extension of the methods developed here will yield an algorithm for computing, in some cases of interest, the 2-index, which is a quantity playing a prominent role in Borsuk-Ulam style applications of topology in combinatorics and geometry, e.g., in topological lower bounds for the chromatic number of a graph. In a certain range of dimensions, deciding the embeddability of a simplicial complex into d also amounts to a 2-index computation. This is the main motivation of our work. We believe that investigating the computational complexity of questions in homotopy theory and similar areas presents a fascinating research area, and we hope that our work may help bridge the cultural gap between algebraic topology and theoretical computer science. Copyright © SIAM.

关键词： Topology

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Personalization is not a panacea: Balancing serendipity and personalization in medical news content delivery 12

Personalization is not a panacea: Balancing serendipity and ...

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2nd acm SIGHIT International Health Informatics symposium, IHI'12

作者： Fan, Xiangyu Mostafa, Javed Mane, Ketan Sugimoto, Cassidy Laboratory of Applied Informatics Research University of North Carolina at Chapel Hill Chapel Hill NC 27599 United States Renaissance Computing Institute University of North Carolina at Chapel Hill Chapel Hill NC 27599 United States School of Information and Library Science Indiana University Bloomington Bloomington IN 47405 United States

ISBN: (纸本)9781450307819

Personalization is viewed as a potential solution to the "information overload" problem. In contrast, serendipity is a natural part of human information seeking process that can lead to unexpected and useful discoveries. It appears both serendipity and personalization are important. However, it remains unclear how these modes of interaction impact content retrieval and consumption. To empirically analyze the influence of personalization and serendipity on information retrieval, a medical news information system named MedSIFTER was developed. The system can personalize the presentation of news articles based on users' interest profiles. Using a control variable, built into the system, MeSIFTER's personalization level can be modulated, ranging from high to low (or zero). In this study, based on MedlinePlus as main information source, three different system modalities were compared (zero, low, and high levels of personalization). The experimental analysis engaged three different user groups, over a four week period. Strong evidence of serendipity was found across all three user groups, independent of the level of personalization. Users also appeared to be uniformly satisfied regardless of the level of personalization. Copyright © 2012 acm.

关键词： Information retrieval

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An evolving multi-agent scenario generation framework for simulations in preventive medicine education 12

An evolving multi-agent scenario generation framework for si...

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2nd acm SIGHIT International Health Informatics symposium, IHI'12

作者： Gupta, Manan Bertrand, Jeffrey W. Babu, Sabarish V. Polgreen, Philip Segre, Alberto M. School of Computing Clemson University 100 McAdams Hall Clemson SC - 29634-0974 United States Department of Internal Medicine University of Iowa 200 CMAB Iowa City IA - 52242-2600 United States Department of Computer Science University of Iowa 14D MacLean Hall Iowa City IA - 52242-1419 United States

ISBN: (纸本)9781450307819

We describe the design, implementation and evaluation of a novel multi-agent scenario generation framework for interactive virtual reality simulations towards preventive medicine education. Our scenario generation framework is based on recordings of human movements from a distributed sensor networks deployed in a realworld physical setting. The components of our framework include the generation of unique virtual agent behaviors from the sensor data, and algorithms for the generation of low level or gross movement behaviors such as path determination, directional traffic flows, collision avoidance and overtaking. The framework also includes the generation of high level fine actions for multiagents such as techniques for interactive activities in pedagogical scenarios based on environment and temporal triggers. We applied our multi-agent scenario generation framework in an interactive simulation for hand hygiene education, and conduct an initial usability study to assess the educational benefits of the simulation to nursing students and evaluated the performance characteristics of our framework. Results of our quantitative and qualitative evaluations suggest that our framework was robust in creating engaging, compelling, and realistic interactive training scenarios with multiple virtual agents in simulated hospital situations. Copyright © 2012 acm.

关键词： Virtual reality

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An evaluation of measures to dissociate language and communication disorders from healthy controls using machine learning techniques 12

An evaluation of measures to dissociate language and communi...

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2nd acm SIGHIT International Health Informatics symposium, IHI'12

作者： Gaspers, Judith Thiele, Kristina Cimiano, Philipp Foltz, Anouschka Stenneken, Prisca Tscherepanow, Marko Semantic Computing CRC 673 Bielefeld University Bielefeld Germany Clinical Linguistics CITEC Bielefeld University Bielefeld Germany Clinical Linguistics CRC 673 Bielefeld University Bielefeld Germany Applied Informatics Faculty of Technology Bielefeld University Bielefeld Germany

ISBN: (纸本)9781450307819

Reliably distinguishing patients with verbal impairment due to brain damage, e.g. aphasia, cognitive communication disorder (CCD), from healthy subjects is an important challenge in clinical practice. A widely-used method is the application of word generation tasks, using the number of correct responses as a performance measure. Though clinically well-established, its analytical and explanatory power is limited. In this paper, we explore whether additional features extracted from task performance can be used to distinguish healthy subjects from aphasics or CCD patients. We considered temporal, lexical, and sublexical features and used machine learning techniques to obtain a model that minimizes the empirical risk of classifying participants incorrectly. Depending on the type of word generation task considered, the exploitation of features with state-of-the-art machine learning techniques outperformed the predictive accuracy of the clinical standard method (number of correct responses). Our analyses confirmed that number of correct responses is an adequate measure for distinguishing aphasics from healthy subjects. However, our additional features outperformed the traditional clinical measure in distinguishing patients with CCD from healthy subjects: The best classification performance was achieved by excluding number of correct responses. Overall, our work contributes to the challenging goal of distinguishing patients with verbal impairments from healthy subjects. Copyright © 2012 acm.

关键词： Learning algorithms

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Compiling for automatically generated instruction set extensions 12

Compiling for automatically generated instruction set extens...

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10th International symposium on Code Generation and Optimization, CGO 2012

作者： Murray, Alastair Franke, Björn Institute for Computing Systems Architecture School of Informatics University of Edinburgh 10 Crichton Street Edinburgh EH8 9AB United Kingdom

ISBN: (纸本)9781605586359

The automatic generation of instruction set extensions (ISEs) to provide application-specific acceleration for embedded processors has been a productive area of research in recent years. The use of automatic algorithms, however, results in instructions that are radically different from those found in conventional ISAs. This has resulted in a gap between the hardware's capabilities and the compiler's ability to exploit them. This paper proposes an innovative high-level compiler pass that uses subgraph isomorphism checking to exploit these complex instructions. Our extended code generator also enables the reuse of ISEs designed for one application in another, which may be a newer version of the same application or a different one from the same domain. Operating in a separate pass permits computationally expensive techniques to be applied that are uniquely suited for mapping complex instructions, but unsuitable for conventional instruction selection. We demonstrate that this targeted use of an expensive algorithm effectively controls overall compilation time. The existing, mature, compiler back-end can then handle the remainder of the compilation. Instructions are automatically produced for 179 benchmarks, resulting in a total of 1965 unique instructions. The high-level pass integrated into the open-source GCC compiler is able to use the instructions produced for each benchmark to obtain an average speed-up of 1.26 for the ENCORE extensible processor. Copyright © 2012 acm.

关键词： Program compilers

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Session details: Evolutionary computing track 12

Session details: Evolutionary computing track

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proceedings of the 27th Annual acm symposium on applied computing

作者： Federico Divina Raúl Giráldez Rojo Pablo de Olavide University Spain

No abstract available.

ISBN: (纸本)9781450308571

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Session details: Mobile computing and applications track 12

Session details: Mobile computing and applications track

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proceedings of the 27th Annual acm symposium on applied computing

作者： Hong Va Leong Alvin Chan The Hong Kong Polytechnic University Hong Kong China

No abstract available.

ISBN: (纸本)9781450308571

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ViewPoints: Differential string analysis for discovering client- and server-side input validation inconsistencies

ViewPoints: Differential string analysis for discovering cli...

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21st International symposium on Software Testing and Analysis, ISSTA 2012

作者： Alkhalaf, Muath Choudhary, Shauvik Roy Fazzini, Mattia Bultan, Tevfik Orso, Alessandro Kruegel, Christopher Department of Computer Science University of California Santa Barbara CA United States College of Computing Georgia Institute of Technology Atlanta GA United States

ISBN: (纸本)9781450314541

Since web applications are easily accessible, and often store a large amount of sensitive user information, they are a common target for attackers. In particular, attacks that focus on input validation vulnerabilities are extremely effective and dangerous. To address this problem, we developed ViewPoints - a technique that can identify erroneous or insufficient validation and sanitization of the user inputs by automatically discovering inconsistencies between client- and server-side input validation functions. Developers typically perform redundant input validation in both the front-end (client) and the back-end (server) components of a web application. Client- side validation is used to improve the responsiveness of the application, as it allows for responding without communicating with the server, whereas server-side validation is necessary for security reasons, as malicious users can easily circumvent client-side checks. ViewPoints (1) automatically extracts client- and server-side input validation functions, (2) models them as deterministic finite automata (DFAs), and (3) compares client- and server-side DFAs to identify and report the inconsistencies between the two sets of checks. Our initial evaluation of the technique is promising: when applied to a set of real-world web applications, ViewPoints was able to automatically identify a large number of inconsistencies in their input validation functions. © 2012 acm.

关键词： Software testing

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