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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8850卷 80-95页

作者： Stocklöw, Carsten Medrano Gil, Alejandro M. Fides Valero, Alvaro Girolami, Michele Lenzi, Stefano Fraunhofer Institute for Computer Graphics Research Fraunhoferstr. 5 Darmstadt64283 Germany Life Supporting Technologies Universidad Politècnica de Madrid Avd. Complutense Madrid28040 Spain ITACA at Universidad Politécnica de Valencia Edificio 8G Camino de Vera s/n Valencia46022 Spain ISTI-CNR Pisa56124 Italy Department of Computer Science University of Pisa Pisa56124 Italy

Over the last years, Ambient Assisted Living (AAL) technologies have seen a remarkable grow up. Although this field has been researched for many years and different projects have investigated and proposed AAL platforms with a rich set of functionality, the current market situation still favors isolated solutions. A possible reason is that those platforms are too complex to be easily setup and maintained. Also, resource sharing is possible between services, but not between platforms. A promising alternative is provided by the cloud computing approach which integrates common services in a shared way. Thus, we propose to use an AAL platform as Platform-as-a-Service in the cloud to offer all functionalities of AAL platforms to services in the cloud while being able to connect to platforms running in each home. We discuss different aspects of this approach and propose a simple verification scenario. An exemplary adoption is discussed for the platform universAAL. © Springer International Publishing Switzerland 2014.

关键词： Assisted living

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A new probability distribution for simultaneous representation of uncertain position and orientation

A new probability distribution for simultaneous representati...

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International Conference on Information Fusion

作者： Igor Gilitschenski Gerhard Kurz Simon J. Julier Uwe D. Hanebeck Intelligent Sensor-Actuator-Systems Laboratory (ISAS) Karlsruhe Institute of Technology (KIT) Germany Department of Computer Science Virtual Environments and Computer Graphics Group

This work proposes a novel way to represent uncertainty on the Lie group of rigid-body motions in the plane. This is achieved by using dual quaternions for representation of a planar rigid-body motion and proposing a probability distribution from the exponential family of distributions that inherently respects the underlying structure of the representation. This is particularly beneficial in scenarios involving strong measurement noise. A relationship between the newly proposed distributional model and the Bingham distribution is discussed. The presented results involve formulas for computation of the normalization constant, the mode, parameter estimation techniques, and a closed-form Bayesian measurement fusion.

关键词： Quaternions Estimation Vectors Transmission line matrix methods Probability distribution Bayes methods Robot sensing systems

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Feedback-based smartphone strategic sampling for BYOD security

Feedback-based smartphone strategic sampling for BYOD securi...

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International Conference on computer Communications and Networks (ICCCN)

作者： Feng Li Chin-Tser Huang Jie Huang Wei Peng Department of Computer Information and Graphics Technology Department of Computer and Information Science Indiana University-Purdue University Indianapolis Indianapolis IN U.S.A. Department of Computer Science and Engineering University of South Carolina Columbia SC U.S.A.

ISBN: (纸本)9781479935734

Bring Your Own Device (BYOD) is an information technology (IT) policy that allows employees to use their own wireless devices to access internal network at work. Mobile malware is a major security concern that impedes BYOD's further adoption in enterprises. Existing works identify the need for better BYOD security mechanisms that balance between the strength of such mechanisms and the costs of implementing such mechanisms. In this paper, based on the idea of self-reinforced feedback loop, we propose a periodic smartphone sampling mechanism that significantly improve BYOD security mechanism's effectiveness without incurring further costs. We quantify the likelihood that “a BYOD smartphone is infected by malware” by two metrics, vulnerability and uncertainty, and base the iterative sampling process on these two metrics; the updated values of these metrics are fed back into future rounds of the mechanism to complete the feedback loop. We validate the efficiency and effectiveness of the proposed strategic sampling via simulations driven by publicly available, real-world collected traces.

关键词： Malware Measurement Uncertainty Topology Wireless communication Feedback loop

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Image-based X-ray visualization techniques for spatial understanding in outdoor augmented reality 14

Image-based X-ray visualization techniques for spatial under...

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26th Australian computer-Human Interaction Conference, OzCHI 2014

作者： Zollmann, Stefanie Grasset, Raphael Reitmayr, Gerhard Langlotz, Tobias Institute for Computer Graphics and Vision Graz University of Technology Graz Austria Animation Research Ltd. Dunedin New Zealand Qualcomm Austria Research Center Vienna Austria Department of Information Science University of Otago Dunedin New Zealand

ISBN: (纸本)9781450306539

This paper evaluates different state-of-the-art approaches for implementing an X-ray view in Augmented Reality (AR). Our focus is on approaches supporting a better scene understanding and in particular a better sense of depth order between physical objects and digital objects. One of the main goals of this work is to provide effective X-ray visualization techniques that work in unprepared outdoor environments. In order to achieve this goal, we focus on methods that automatically extract depth cues from video images. The extracted depth cues are combined in ghosting maps that are used to assign each video image pixel a transparency value to control the overlay in the AR view. Within our study, we analyze three different types of ghosting maps, 1) alpha-blending which uses a uniform alpha value within the ghosting map, 2) edge-based ghosting which is based on edge extraction and 3) image-based ghosting which incorporates perceptual grouping, saliency information, edges and texture details. Our study results demonstrate that the latter technique helps the user to understand the subsurface location of virtual objects better than using alpha-blending or the edge-based ghosting. Copyright 2014 ACM.

关键词： Augmented reality

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Lifetime optimization for real-time embedded systems considering electromigration effects

Lifetime optimization for real-time embedded systems conside...

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IEEE International Conference on computer-Aided Design

作者： Taeyoung Kim Bowen Zheng Hai-Bao Chen Qi Zhu Valeriy Sukharev Sheldon X.-D. Tan Department of Computer Science and Engineering University of California Riverside CA Department of Electrical and Computer Engineering University of California Riverside CA Mentor Graphics Corporation Fremont CA USA

In this article, we propose a new lifetime task optimization technique for real-time embedded processors considering the electromigration-induced reliability. The new approach is based on a recently proposed physics-based electromigration (EM) model for more accurate EM assessment of a power grid network at the chip level. We apply the dynamic voltage and frequency scaling (DVFS) (by selecting the performance states or p-states of the tasks to manage the power) and thus the lifetime of the processor running different tasks over their periods. We consider both single-rate and multi-rate embedded systems with preemption. To model the mean-time-to-failure (MTTF) of a task for a given p-state, response surface modeling is applied. We then frame the reliability optimization problem as the continuous constrained nonlinear optimization problem in which the system EM-induced reliability is maximized subject to the timing constraints, which is further solved by simulated annealing method. Experimental results show that for low utilization systems, significant reliability improvement can be achieved with even smaller power consumption than existing reliability-ignore scheduling method. The proposed method can lead to near Pareto's front trade-off between the power/energy and the lifetime compared to the existing task scheduling method.

关键词： Reliability Optimization Real-time systems Wires Stress Program processors Embedded systems

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Visualization in connectomics

Mathematics and Visualization

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Mathematics and Visualization 2014年 37卷 221-245页

作者： Pfister, Hanspeter Kaynig, Verena Botha, Charl P. Bruckner, Stefan Dercksen, Vincent J. Hege, Hans-Christian Roerdink, Jos B.T.M. School of Engineering and Applied Sciences Harvard University 33 Oxford St CambridgeMA02138 United States Vxlabs Somerset West South Africa Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstraße 9-11/E186 Wien1040 Austria Department of Visualization and Data Analysis Zuse Institute Berlin Takustraße 7 Berlin14195 Germany Johann Bernoulli Institute for Mathematics and Computer Science University of Groningen P.O. Box 407 AK Groningen9700 Netherlands

Connectomics is a branch of neuroscience that attempts to create a connectome, i.e., a completemap of the neuronal system and all connections between neuronal structures. This representation can be used to understand how functional brain states emerge from their underlying anatomical structures and how dysfunction and neuronal diseases arise. We review the current state-of-the-art of visualization and image processing techniques in the field of connectomics and describe a number of challenges. After a brief summary of the biological background and an overview of relevant imaging modalities, we review current techniques to extract connectivity information from image data at macro-, meso- and *** also discuss data integration and neural network modeling, as well as the visualization, analysis and comparison of brain networks. © 2014, Springer-Verlag London.

关键词： Visualization

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Boundary Fractal Analysis of Two Cube-oriented Grains in Partly Recrystallized Copper

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IOP Conference Series: Materials science and Engineering 2015年第1期82卷

作者： J Sun Y B Zhang A B Dahl K Conradsen D Juul Jensen Danish-Chinese Center for Nanometals Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus 4000 Roskilde Denmark Section for Image Analysis and Computer Graphics Department of Applied Mathematics and Computer Science Technical University of Denmark Richard Petersens Plads 2800 Kgs. Lyngby Denmark

The protrusions and retrusions observed on the recrystallizing boundaries affect the migration kinetics during recrystallization. Characterization of the boundary roughness is necessary in order to evaluate their effects. This roughness has a structure that can be characterized by fractal analysis, and in this study the so-called 'Minkowski sausage' method is adopted. Hereby, two cube-oriented grains in partly recrystallized microstructures are analyzed and quantitative information regarding the dimensions of protrusions/retrusions is obtained.

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Characterization of boundary roughness of two cube grains in partly recrystallized copper

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IOP Conference Series: Materials science and Engineering 2015年第1期89卷

Protrusions and retrusions typically form on recrystallizing boundaries and thus the boundaries often appear rough. Characterization of the boundary roughness is necessary in order to evaluate the effects of protrusions and retrusions on boundary migration. In the current work, a variable termed area integral invariant is employed to provide quantitative information of individual protrusions/retrusions on boundaries surrounding two selected recrystallizing grains in partly recrystallized copper as well as of the overall roughness of the boundaries.

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Making 3D work: A classification of visual depth cues, 3D display technologies and their applications 14

Making 3D work: A classification of visual depth cues, 3D di...

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14th Australasian User Interface Conference, AUIC 2013

作者： Mehrabi, Mostafa Peek, Edward M. Wuensche, Burkhard C. Lutteroth, Christof Graphics Group Department of Computer Science University of Auckland New Zealand

ISBN: (纸本)9781921770241

3D display technologies improve perception and interaction with 3D scenes, and hence can make applications more effective and efficient. This is achieved by simulating depth cues used by the human visual system for 3D perception. The type of employed depth cues and the characteristics of a 3D display technology affect its usability for different applications. In this paper we review, analyze and categorize 3D display technologies and applications, with the goal of assisting application developers in selecting and exploiting the most suitable technology. Our first contribution is a classification of depth cues that incorporates their strengths and limitations. These factors have not been considered in previous contributions, but they are important considerations when selecting depth cues for an application. The second contribution is a classification of display technologies that highlights their advantages and disadvantages, as well as their requirements. We also provide examples of suitable applications for each technology. This information helps system developers to select an appropriate display technology for their applications. © 2013, Australian computer Society, Inc.

关键词： Three dimensional displays

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Research on the security of virtual network with Xen platform

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Information Technology Journal 2013年第23期12卷 7774-7777页

作者： Wu, Hanqian Li, Wei Winer, Chuck Yao, Li School of Computer Science and Engineering Southeast University Nanjing JiangSu 210096 China Department of Computer Information Technology and Graphics Purdue University Calumet Hammond IN United States

As the next generation of networking computing, cloud computing can offer both software and hardware as on-demand resources and services over the Internet and therefore reduce the capital expenditure and operational expenditure for IT consumers. In order to realize these purposes, however, there are still some challenges to be solved. With no doubts, security is the most concerned issue. This is why security must be integrated into every aspect of cloud computing. Virtualization is the key technology to build a cloud computing platform, as a result, virtualization security is one of the significant concerns in cloud computing. In this paper, we focus on the security of virtual network in virtualized environment. First, we research Xen platform which is the most popular hypervisor used in the industry and then the security problems that exist in a virtual network are discussed and analysed based on Xen platform. Finally this paper presents a multi-layer virtual network framework aimed to control the inter-communication among virtual machines deployed in physical machines with higher security. © 2013 Asian Network for Scientific Information.

关键词： Virtualization

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