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HybridExploration: A distributed approach to terrain exploration using mobile and fixed sensor nodes

HybridExploration: A distributed approach to terrain explora...

引用

2008 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Ettore Ferranti Niki Trigoni Mark Levene Computing Laboratory University of Oxford Oxford UK School of Computer Science and Information Systems Birkbeck College University of London UK

ISBN: (纸本)9781424420575

When an emergency occurs within a building, it may be initially safer to send autonomous mobile nodes, instead of human responders, to explore the area and identify hazards and victims. Exploring all the area in the minimum amount of time and reporting back interesting findings to the human personnel outside the building is an essential part of rescue operations. Our assumptions are that the area map is unknown, there is no existing network infrastructure, long-range wireless communication is unreliable and nodes are not location-aware. We take into account these limitations, and propose a novel algorithm, HybridExploration, that makes use of both mobile nodes (robots, called agents) and stationary nodes (inexpensive smart devices, called tags). As agents enter the emergency area, they sprinkle tags within the space to label the environment with states. By reading and updating the state of the local tags, agents are able to coordinate indirectly with each other, without relying on direct agent-to-agent communication. In addition, tags wirelessly exchange local information with nearby tags to further assist agents in their exploration task. Our simulation results show that the proposed algorithm, which exploits both tag-to-tag and agent-to-tag communication, outperforms previous algorithms that rely only on agent-to-tag communication.

关键词： Protocols Robot sensing systems Buildings Humans Navigation Wireless sensor networks Government

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An image quality assessment metric based contourlet

An image quality assessment metric based contourlet

引用

2008 IEEE International Conference on Image Processing, ICIP 2008

作者： Lu, Wen Gao, Xinbo Li, Xuelong Tao, Dacheng School of Electronic Engineering Xidian University Xi'an 710071 China School of Computer Science and Information Systems Birkbeck University of London London WC1E 7HX United Kingdom Department of computing Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)1424417643

In reduced-reference (RR) image quality assessment (IQA), the visual quality of distorted images is evaluated with only partial information extracted from original images. In this paper, by considering the information of textures and directions during image distortion, we propose a new reduced-reference IQA metric to calculate the diversifications based on contourlet transform. Experimental results illustrate that even with low data rate, the presented metric has still good consistency with the subjective perception. © 2008 IEEE.

关键词： Image quality

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Improving the Precision of Fowler's Definitions of Bad Smells

Improving the Precision of Fowler's Definitions of Bad Smell...

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Annual IEEE/ NASA Goddard Workshop on Software Engineering

作者： Min Zhang Nathan Baddoo Paul Wernick Tracy Hall School of Computer Science University of Herfordshire Hatfield Hertfordshire UK School of Information Systems Computing & Mathematics Brunei University Uxbridge Middlesex UK

Current approaches to detecting bad smells in code are mainly based on software metrics. We suggest that these methods lack precision in detecting bad smells, and we propose a code pattern-based approach to detecting bad smells. However before such a pattern-based approach can be implemented, Fowler's original definitions of bad smells need to be made more precise. Currently Fowler's definitions are too informal to implement in a pattern-searching tool. In this paper we use an expert panel to evaluate our enhanced definitions for five of Fowler's bad smells. We use a questionnaire to survey four experts' opinions of our bad smell definitions. Our results show that the experts basically agree with our enhanced definitions of the message chains, middle man and speculative generality bad smells. However, there are strong disagreements on our definitions of the data clumps and switch statements bad smells. We present enhanced definitions on the basis of these expert opinions.

关键词： Switches Software metrics Conferences computer science Programming environments Reverse engineering information systems Mathematics Software measurement Logic programming

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Geometrically invariant watermarking using affine covariant regions

Geometrically invariant watermarking using affine covariant ...

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2008 IEEE International Conference on Image Processing, ICIP 2008

作者： Deng, Cheng Gao, Xinbo Tao, Dacheng Li, Xuelong Lab of Video and Image Processing System School of Electronic Engineering Xidian University Xi'an China Department of computing Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong School of Computer Science and Information Systems Birkbeck University of London London WC1E7HX United Kingdom

ISBN: (纸本)1424417643

In this paper, we present a robust approach to digital watermarking embedding and retrieval for digital images. The affine-invariant point detector is used to extract feature regions of the given host image. Image normalization and dominant gradient orientation alignment are applied to these feature regions to achieve scaling and rotation invariance. Thereafter, watermarks are embedded in these feature regions. The advantage of this proposed approach is demonstrated by a large amount of experiments, which can against different attacks, such as common image processing, rotation, scaling, cropping, and several other affine transformations. © 2008 IEEE.

关键词： Image processing

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Testing in the distributed test architecture

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作者： Chen, Jessica Hierons, Robert M. Ural, Hasan School of Computer Science University of Windsor Windsor ON N9B 3P4 Canada Department of Information Systems and Computing Brunel University Uxbridge Middlesex UB8 3PH United Kingdom School of Information Technology and Engineering University of Ottawa Ottawa ON K1N 6N5 Canada

ISBN: (纸本)3540789162

The introduction of multiple remote testers to apply a test or checking sequence introduces the possibility of controllability and observability problems. These problems can require the use of external coordination message exchanges among testers. It is desirable to construct a test or checking sequence from the specification of the system under test such that it is free from these problems without requiring the use of external coordination messages. Here we define criteria on the specification of the system under test for this to be possible. For specifications satisfying the criteria, algorithms for constructing subsequences that eliminate the need for external coordination messages are given. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： computer architecture

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Bayesian tensor analysis

Bayesian tensor analysis

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International Joint Conference on Neural Networks (IJCNN)

作者： Dacheng Tao Jimeng Sun Jialie Shen Xindong Wu Xuelong Li Stephen J. Maybank Christos Faloutsos Biometrics Research Centre Department of Computing Hong Kong Polytechnic University Hong Kong China Department of Computer Science Carnegie Mellon University Pittsburgh USA School of Information Systems Singapore Management University Singapore Department of Computer Science University of Vermont Burlington USA Department of Computing Hong Kong Polytechnic University Hong Kong China School of Computer Science and Information Systems University of London UK

Vector data are normally used for probabilistic graphical models with Bayesian inference. However, tensor data, i.e., multidimensional arrays, are actually natural representations of a large amount of real data, in data mining, computer vision, and many other applications. Aiming at breaking the huge gap between vectors and tensors in conventional statistical tasks, e.g., automatic model selection, this paper proposes a decoupled probabilistic algorithm, named Bayesian tensor analysis (BTA). BTA automatically selects a suitable model for tensor data, as demonstrated by empirical studies.

关键词： Tensile stress Computational modeling Bayesian methods Probabilistic logic Analytical models Electronic mail Principal component analysis

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Innovations in measuring accessibility: Theoretical and practical perspectives 22

Innovations in measuring accessibility: Theoretical and prac...

引用

22nd British HCI Group Annual Conference on People and computers: Culture, Creativity, Interaction, BCS HCI 2008

作者： Petrie, Helen Power, Chris Adams, Ray Hwang, Faustina Weber, Gerhard Darzentas, Jenny Velasco, Carlos A. Department of Computer Science University of York YorkYO10 5DD United Kingdom CIRCUA School of Computing Science Middlesex University LondonNW4 4BT United Kingdom School of Systems Engineering University of Reading ReadingRG6 6AY United Kingdom Department of Computer Science Technische Universität Dresden Dresden01187 Germany Department of Product and Systems Design University of the Aegean Ermoupolis SyrosGR-84100 Greece Fraunhofer Institute of Applied Information Technology Sankt Augustin Germany

ISBN: (纸本)9781906124069

Recently, there has been an increased awareness in the general public, in government and in business that people with disabilities and older people have distinct needs and preferences that must be met in order for them to participate as equal members of environments incorporating information and communications technologies. With this increased awareness has come legislation and company policies stating the necessary provision of accessible systems for disabled and older people in all facets of society. In order for these policies to be properly implemented there is a need to further understand accessibility and its impact on the people and systems around us. This workshop will focus on exploring the concept of accessibility and the boundaries of accessibility research. It is intended to bring together individuals working in disparate fields of research to improve the definition of accessibility and to refine our understanding of the as yet unaddressed barriers in the information society such as the impact of mobile technology and the aging population. © 2008 The Author Published by the British computer Society.

关键词： Accessibility Disabled people Older people Theory and methods

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Web Application Development Lifecycle for Small Medium-Sized Enterprises (SMEs) (Short Paper)

Web Application Development Lifecycle for Small Medium-Sized...

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International Conference on Quality Software

作者： Wei Huang Ru Li Carsten Maple Hongji Yang David Foskett Vince Cleaver Department of Computing & Information Systems University of Bedfordshire UK Kingsmede House Exxcom Limited Shefford Bedfordshire UK Computer Science Division School of Computing De Montfort University UK

ISBN: (纸本)9780769533124

Software engineering has proven to be very important for standard software development. But, can Web applications be engineered as well? Currently, J2EE, Apache/Perl/PDP/MySQL and .NET have been universally accepted as Web application development technology, but there is no universal accepted methodology for Web application development process. Web application needs to be engineered by moving focus from technology to process. In this paper, a novel lifecycle model for Web application development in SMEs has been proposed. It includes two iterative process phases with a pre-iterative sequential process phase. This model has been applied to a real-world project and the result has proved its potential to shape the way on how web applications can be engineered in SMEs.

关键词： Testing Biological system modeling Risk analysis Encoding Maintenance engineering Programming Software

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By when do you need this done? Discovering knowledge workers' time management practices

By when do you need this done? Discovering knowledge workers...

引用

14th Americas Conference on information systems, AMCIS 2008

作者： Wu, Dezhi Passerini, Katia Bartolacci, Michael R. Computer Science and Information Systems Department Southern Utah University Cedar City UT 84720 United States School of Management and College of Computing Sciences New Jersey Institute of Technology University Heights Newark NJ 07102 United States Information Sciences and Technology Penn State University - Berks P.O. Box 7009 Reading PA 19610 United States

ISBN: (纸本)9781605609539

This research investigates knowledge workers' individual time management practices. At an academic institution in the united States, a set of in-depth semi-structured interviews was conducted to explore how individual knowledge workers manage their time demands and respond to the temporal norms and boundaries designed by their organizations. This research extends and applies taxonomies used for knowledge management to time management. Based on the qualitative analysis, a variety of approaches to managing time were identified. Personal time management practices mainly involve individual and organizational constraints that guide the perception of time and the allocation of resources around deadlines, distinguishing between work and family contexts. Moreover, the research shows that knowledge workers focus on conditional knowledge of time (i.e., understanding when the deadlines are), and pragmatic knowledge (i.e., finding out appropriate strategies for achieving time management goals). Study limitations and future research opportunities are also discussed.

关键词： Knowledge management

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On the scalability of particle swarm optimisation

On the scalability of particle swarm optimisation

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Congress on Evolutionary Computation

作者： Sebastien Piccand Michael O'Neill Jacqueline Walker Department of Computer Science ' Information Systems University of Limerick Limerick Ireland Natural Computing Research ' Applications group School of Computer Science ' Informatics University College Dublin Dublin Ireland Department of Electronic and Computer Engineering University of Limerick Limerick Ireland

Particle swarm has proven to be competitive to other evolutionary algorithms in the field of optimization, and in many cases enables a faster convergence to the ideal solution. However, like any optimization algorithm it seems to have difficulties handling optimization problems of high dimension. Here we first show that dimensionality is really a problem for the classical particle swarm algorithms. We then show that increasing the swarm size can be necessary to handle problem of high dimensions but is not enough. We also show that the issue of scalability occurs more quickly on some functions.

关键词： Benchmark testing Topology Particle swarm optimization Scalability Evolutionary computation Optimization Convergence

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