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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2011年 6844 LNCS卷 VI页

作者： Dehne, Frank Iacono, John Sack, Jörg-Rüdiger Carleton University School of Computer Science Parallel Computing and Bioinformatics Laboratory 1125 Colonel By Drive Ottawa ON K1S 5B6 Canada Polytechnic Institute of New York University Department of Computer Science and Engineering 5 MetroTech. Center New York NY 11201 United States Carleton University School of Computer Science Herzberg Laboratories 1125 Colonel By Drive Ottawa ON K1S 5B6 Canada

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CDRAS: An approach to dealing with Man-in-the-Middle attacks in the context of voice over IP

CDRAS: An approach to dealing with Man-in-the-Middle attacks...

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2011 6th International Conference on Availability, Reliability and Security, ARES 2011

作者： Hofbauer, Stefan Quirchmayr, Gerald Wills, Christopher C. Danube Data Center GmbH Network Department Floridsdorfer Hauptstrasse 1 1210 Vienna Austria University of Vienna Multimedia Information Systems Research Group Liebiggasse 4/3-4 1010 Vienna Austria University of South Australia Division of Information Technology School of Computer and Information Science Mawson Lakes SA 5095 Australia University of South Australia Division of Information Technology School of Computer and Information Science GPO Box 2471 Adelaide SA 5001 Australia Kingston University Faculty of Computing Information Systems and Mathematics Penrhyn Road Surrey KT1 2EE London United Kingdom

ISBN: (纸本)9780769544854

This paper describes the CDRAS (Call Detail Records Analysis System) system, the motivation behind it, its approach and its background. The system aims at dealing with the notorious Man-in-the-Middle attack in the context of VoIP. As the use of such a system constitutes leads to an interference with the privacy of users, the most relevant legal aspects related to this work are also briefly discussed. © 2011 IEEE.

关键词： Voice/data communication systems

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Principles of genomic robustness inspire fault-tolerant WSN topologies: A network science based case study

Principles of genomic robustness inspire fault-tolerant WSN ...

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IEEE Annual Conference on Pervasive computing and Communications Workshops (PerCom)

作者： Preetam Ghosh Michael Mayo Vijender Chaitankar Tanwir Habib Ed Perkins Sajal K Das School of Computing University of Southern Mississippi Hattiesburg MS USA Environmental Laboratory U.S. Army Engineer Research and Development Center Vicksburg MS USA Department Computer Science & Engineering University of Texas Arlington Arlington TX USA

Wireless sensor networks (WSNs) are frameworks for modern pervasive computing infrastructures, and are often subject to operational difficulties, such as the inability to effectively mitigate signal noise or sensor failure. Natural systems, such as gene regulatory networks (GRNs), participate in similar information transport and are often subject to similar operational disruptions (noise, damage, etc.). Moreover, they self-adapt to maintain system function under adverse conditions. Using a PBN-type model valid in the operational and functional overlap between GRNs and WSNs, we study how attractors in the GRN-the target state of an evolving network-behave under selective gene or sensor failure. For “larger” networks, attractors are “robust”, in the sense that gene failures (or selective sensor failures in the WSN) conditionally increase their total number; the “distance” between initial states and their attractors (interpreted as the end-to-end packet delay) simultaneously decreases. Moreover, the number of attractors is conserved if the receiving sensor returns packets to the transmitting node; however, the distance to the attractors increases under similar conditions and sensor failures. Interpreting network state-transitions as packet transmission scenarios may allow for trade-offs between network topology and attractor robustness to be exploited to design novel fault-tolerant routing protocols, or other damage-mitigation strategies.

关键词： Wireless sensor networks Boolean functions Robustness Routing protocols Delay Topology

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Astrophysical particle simulations with large custom GPU clusters on three continents

Astrophysical particle simulations with large custom GPU clu...

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作者： Spurzem, R. Berczik, P. Berentzen, I. Nitadori, K. Hamada, T. Marcus, G. Kugel, A. Männer, R. Fiestas, J. Banerjee, R. Klessen, R. National Astronomical Observatories of China Chinese Academy of Sciences 20A Datun Rd. Chaoyang District Beijing 100012 China University of Heidelberg Mönchhofstr. 12-14 69120 Heidelberg Germany Nagasaki Advanced Computing Center University of Nagasaki RIKEN Institute Tokyo Japan Department of Computer Science V Central Inst. of Computer Engineering University of Heidelberg Heidelberg Germany University of Heidelberg Heidelberg Germany Main Astronomical Observatory National Academy of Sciences of Ukraine MAO/NASU 27 Akademika Zabolotnoho St. 03680 Kyiv Ukraine

We present direct astrophysical N-body simulations with up to six million bodies using our parallel MPICUDA code on large GPU clusters in Beijing, Berkeley, and Heidelberg, with different kinds of GPU hardware. The clusters are linked in the cooperation of ICCS (International center for Computational science). We reach about one third of the peak performance for this code, in a real application scenario with hierarchically block time-steps and a core-halo density structure of the stellar system. The code and hardware is used to simulate dense star clusters with many binaries and galactic nuclei with supermassive black holes, in which correlations between distant particles cannot be neglected. © Springer-Verlag 2011.

关键词： computer hardware

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Supporting the combination and integration of multiple standards and models

Supporting the combination and integration of multiple stand...

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Colombian Conference on computing (CCC)

作者： César Pardo Francisco J. Pino Félix García Mario Piattini Maria Teresa Baldasarre IDIS Research Group University of Cauca Colombia Advanced Computing Technologies University of Castilla La Mancha Spain Department of Systems Engineering University of Cauca Colombia Computer Science University of Castilla La Mancha Spain Alarcos Quality Center s.l. a spinoff of the Alarcos Research Group University of Castilla La Mancha Spain Computer Science University of Bari Italy

There is growing interest in defining best practices that support multiple needs in companies. This has led to the current situation, where organizations, universities and research groups, amongst others, have defined a wide range of reference models. This is also known as the quagmire of standards and models. The ample assortment of possibilities enables companies to choose and implement the models that are most suitable for their particular features. There may even be a reduction in the cost associated with effort and time in their implementation. Each model, however, defines its own process structure, approach, scope, and so forth, so carrying out the implementation of more than two models without guidelines or suitable tools can be a hard, if not impossible, task. With all this in mind, the aim of this paper is to present a harmonization Framework, which establishes the elements and tools needed to support the harmonization of multiple reference models. It also presents a detailed summary of the elements defined, along with a summary of the successful application of the harmonization framework in two case studies. This harmonization framework and its elements have been shown to be suitable for supporting the harmonization of multiple models.

关键词： ISO standards Educational institutions Software Companies Software engineering computers

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Geometry-aware video registration

Geometry-aware video registration

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15th International Workshop on Vision, Modeling and visualization, VMV 2010

作者： Palma, Gianpalo Callieri, Marco Dellepiane, Matteo Corsini, Massimiliano Scopigno, Roberto Department of Computer Science University of Pisa Italy Visual Computing Lab. ISTI-CNR Pisa Italy

ISBN: (纸本)9783905673791

We present a new method for the accurate registration of video sequences of a real object over its dense triangular mesh. The goal is to obtain an accurate video-to-geometry registration to allow the bidirectional data transfer between the 3D model and the video using the perspective projection defined by the camera model. Our solution uses two different approaches: feature-based registration by KLT video tracking, and statistic-based registration by maximizing the Mutual Information (MI) between the gradient of the frame and the gradient of the rendering of the 3D model with some illumination related properties, such as surface normals and ambient occlusion. While the first approach allows a fast registration of short sequences with simple camera movements, the MI is used to correct the drift problem that KLT tracker produces over long sequences, due to the incremental tracking and the camera motion. We demonstrate, using synthetic sequences, that the alignment error obtained with our method is smaller than the one introduced by KLT, and we show the results of some interesting and challenging real sequences of objects of different sizes, acquired under different conditions. © The Eurographics Association 2010.

关键词： Data transfer

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Improving 2D-3D registration by mutual information using gradient maps

Improving 2D-3D registration by mutual information using gra...

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8th Eurographics Italian Chapter Conference 2010

作者： Palma, Gianpaolo Corsini, Massimiliano Dellepiane, Matteo Scopigno, Roberto Department of Computer Science University of Pisa Italy Visual Computing Lab. ISTI-CNR Pisa Italy

ISBN: (纸本)9783905673807

In this paper we propose an extension for the algorithms of image-to-geometry registration by Mutual Information(MI) to improve the performance and the quality of the alignment. Proposed for the registration of multi modal medical images, in the last years MI has been adapted to align a 3D model to a given image by using different renderings of the model and a gray-scale version of the input image. A key aspect is the choice of the rendering process to correlate the 3D model to the image without taking into account the texture data and the lighting conditions. Even if several rendering types for the 3D model have been analyzed, in some cases the alignment fails for two main reasons: the peculiar reflection behavior of the object that we are not able to reproduce in the rendering of the 3D model without knowing the material characteristics of the object and the lighting conditions of the acquisition environment;the characteristics of the image background, especially non uniform background, that can degrade the convergence of the registration. To improve the quality of the registration in these cases we propose to compute the MI between the gradient map of the 3D rendering and the gradient map of the image in order to maximize the shared data between them. © The Eurographics Association 2010.

关键词： Lighting

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Bob’s Project Guidelines: Writing a Dissertation for a BSc. in computer science

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Innovation in Teaching and Learning in Information and computer sciences 2011年第1期10卷

作者： Robert S Laramee Visual and Interactive Computing Group Computer Science Department Swansea University UK r.s.laramee@swansea.ac.u

These detailed guidelines attempt to explain the mechanics of writing a third year project dissertation in computer science. They serve as a useful starting point for students (and new advisers) in their third or fourth year of study in the computer science department of a UK-based university. Afterall, no one is born knowing how to write a dissertation. Yet, there are certain elements, a commonality, that can be found in virtually all good dissertations. We give our recommendations as to each section a good dissertation consists of as well as what each section contains. These guidelines are generic and can be customized to fit most projects. The guidelines are open and free to use at any university or institution without *** believe that the writing can start with the abstract, however, in practice writing usually starts with the background section. The abstract can be approximately 6–12 sentences. It is a difficult starting point, but it forces the author to write down a concise description of what it is they’re researching and what the benefits are. Chances are, if the author can’t write an abstract, then it is not clear in the author’s mind what the project is about. Of course the abstract will be refined and updated over the lifetime of the project. The abstract can concisely (1) identify the project topic, (2) identify the benefits and advantages that result (3) and if there is novelty, describe the novelty of the presented work. If there’s a description of the project in a previously existing project selection brochure then that can be used as a basis for an abstract. These guidelines are a starting point only and are not a substitute for an advisor.

关键词： project guidelines computer science

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Entanglement can Completely Defeat Quantum Noise

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Physical Review Letters 2011年第25期107卷 250504-250504页

作者： Jianxin Chen Toby S. Cubitt Aram W. Harrow Graeme Smith Department of Mathematics & Statistics U. of Guelph Guelph Ontario Canada Institute for Quantum Computing U. of Waterloo Waterloo Ontario Canada Departamento de Análisis Matemático U. Complutense de Madrid Plaza de Ciencias 3 28040 Madrid Spain Department of Computer Science & Engineering U. of Washington Seattle Washington 98195 USA IBM T.J. Watson Research Center Yorktown Heights New York 10598 USA

We describe two quantum channels that individually cannot send any classical information without some chance of decoding error. But together a single use of each channel can send quantum information perfectly reliably. This proves that the zero-error classical capacity exhibits superactivation, the extreme form of the superadditivity phenomenon in which entangled inputs allow communication over zero-capacity channels. But our result is stronger still, as it even allows zero-error quantum communication when the two channels are combined. Thus our result shows a new remarkable way in which entanglement across two systems can be used to resist noise, in this case perfectly. We also show a new form of superactivation by entanglement shared between sender and receiver.

关键词： Quantum noise

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Challenges in wide-area structure-from-motion

Challenges in wide-area structure-from-motion

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作者： Pollefeys, Marc Frahm, Jan-Michael Fraundorfer, Friedrich Zach, Christopher Wu, Changchang Clipp, Brian Gallup, David Institute of Visual Computing ETH Zurich Switzerland Department of Computer Science University of North Carolina Chapel Hill United States

The topic of this paper is wide area structure from motion. We first describe recent progress in obtaining large-scale 3D visual models from images. Our approach consists of a multi-stage processing pipeline, which can process a recorded video stream in real-time on standard PC hardware by leveraging the computational power of the graphics processor. The output of this pipeline is a detailed textured 3D model of the recorded area. The approach is demonstrated on video data recorded in Chapel Hill containing more than a million frames. While for these results GPS and inertial sensor data was used, we further explore the possibility to extract the necessary information for consistent 3D mapping over larger areas from images only. In particular, we discuss our recent work focusing on estimating the absolute scale of motion from images as well as finding intersections where the camera path crosses itself to effectively close loops in the mapping process. For this purpose we introduce viewpointinvariant patches (VIP) as a new 3D feature that we extract from 3D models locally computed from the video sequence. These 3D features have important advantages with respect to traditional 2D SIFT features such as much stronger viewpoint-invariance, a relative pose hypothesis from a single match and a hierarchical matching scheme naturally robust to repetitive structures. In addition, we also briefly discuss some additional work related to absolute scale estimation and multi-camera calibration. © 2010 Information Processing Society of Japan.

关键词： Pipelines

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