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Using RSS feeds for effective mobile web browsing

Universal Access in the Information Society 2007年第3期6卷 249-257页

作者： Garofalakis, John Stefanis, Vassilios Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece

While mobile phones are becoming more popular, wireless communication vendors and device manufacturers are seeking new applications for their products. Access to the large corpus of Internet information is a very prominent field. However, the technical limitations of mobile devices pose many challenges. Browsing the Internet using a mobile phone is a large scientific and cultural challenge. Web content must be adapted before it can be accessed by a mobile browser. This work presents a new methodology that uses Really Simple Syndication (RSS) feeds for the adaptation of web content for use in mobile phones. This methodology is based on concrete design guidelines and supports different viewing modes. The mobile tool provided using the RSS feeds is evaluated based on user-centered evaluation and the results are presented.

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Supporting end-to-end resource virtualization for Web 2.0 applications using Service Oriented Architecture

Supporting end-to-end resource virtualization for Web 2.0 ap...

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IEEE Globecom Workshops

作者： C. Papagianni G. Karagiannis N. D. Tselikas E. Sfakianakis I. P. Chochliouros D. Kabilafkas T. Cinkler L. Westberg P. Sjodin M. Hidell S. Heemstra de Groot T. Kontos C. Katsigiannis C. Pappas A. Antonakopoulou I. S. Venieris School of Electrical and Computer Engineering National and Technical University of Athens Greece CTIT and Department of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands Department of Telecommunications Science and Technology University of Peloponnese Greece Labs & New Technologies Division Research Programs Section Hellenic Telecommunications Organization S. A. Labs & New Technologies Division Switching & Services Laboratory Hellenic Telecommunications Organization S. A. Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Hungary Ericsson Research Limited Stockholm Sweden School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Twente Institute for Wireless and Mobile Communications Enschede Netherlands Siemens IT Solutions and Services Athens Greece

In recent years, technologies have been introduced offering a large amount of computing and networking resources. New applications such as Google AdSense and BitTorrent can profit from the use of these resources. An efficient way of discovering and reserving these resources is by using the Service Oriented Architecture (SOA) concept. SOA can be considered as a philosophy or paradigm in organizing and utilizing services and capabilities that may be under the control of different ownership domains. This paper presents an architecture that can be used to support end-to-end resource virtualization for Web 2.0 applications and in particular for peer-to-peer applications by using the Service Oriented Architecture concept.

关键词： Web 2.0 SOA P2P Resource virtualization

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Sonar Explorer: A New Tool for Visualization of Fish Schools from 3D Sonar Data

Sonar Explorer: A New Tool for Visualization of Fish Schools...

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9th Joint Eurographics/IEEE VGTC Symposium on Visualization, EuroVis 2007

作者： Balabanian, Jean-Paul Viola, Ivan Ona, Egil Patel, Ruben Gröller, Eduard Department of Informatics University of Bergen Norway Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Institute of Marine Research Norway

ISBN: (纸本)9783905673456

We present a novel framework for analysis and visualization of fish schools in 3D sonar surveys. The 3D sonar technology is new and there have not been applications to visualize the data in 3D. We have created an application called Sonar Explorer that satisfies the requirements of domain scientists. Sonar Explorer provides easy and intuitive semi-automatic fish school tracking and survey map generation. The overall pipeline is described and all pipeline stages relevant for visualization are highlighted. We present techniques to deal with 3D sonar data specifics: highly anisotropic volume data aligned on a curvilinear grid. Domain scientists provide initial impressions on interaction and outlook. © The Eurographics Association 2007.

关键词： Sonar

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Searchius: A Collaborative Search Engine

Searchius: A Collaborative Search Engine

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Current Trends in computer Science (ENC), Mexican International Conference on

作者： Athanasios Papagelis Christos Zaroliagis Department of Computer Engineering and Informatics Patras Greece Department of Computer Engineering and Informatics Research Academic Computer Technology Institute Patras Greece

Searchius is a collaborative search engine that produces search results based solely on user provided web-related data. We discuss the architecture of this system and how it compares to current state-of-the-art search engines. We show that the global users' preference over pages can be efficiently used as a metric of page quality, and that the inherent organization of the collected data can be used to discover related URLs. We also conduct an extensive experimental study, based on the web related data of 36483 users, to analyze the qualitative and quantitative characteristics of user collected URL collections, to investigate how well the users URL collections cover the web and discover the characteristics that affect the quality of the search results under the proposed setting.

关键词： Search engines Uniform resource locators informatics History Web pages Catalogs computer science International collaboration Data engineering computer architecture

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MBMS Power Planning in Macro and Micro Cell Environments

MBMS Power Planning in Macro and Micro Cell Environments

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IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Evangelos Rekkas Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Department University of Patras Greece

Multimedia Broadcast Multicast Services (MBMS), introduced in Third Generation Partnership Project (3GPP) Release 6, is a point-to-multipoint downlink bearer service that addresses the need for the efficient usage of the expensive radio resources. Power control is one of the most important aspects in MBMS due to the fact that Node B's transmission power is a limited resource and must be shared among all MBMS users in a cell. Consequently, the analysis of transmitted power plays a fundamental role in the planning and optimization process of Universal Mobile Telecommunications System (UMTS) radio access networks. This paper investigates several factors affecting Node B's transmission power levels such as, cell deployment, propagation models, Quality of Service (QoS) requirements, users' distributions and mobility issues. Finally, different transport channels for the transmission of the multicast data over the UTRAN interfaces are considered.

关键词： Quality of service Digital multimedia broadcasting Multimedia communication Radio broadcasting Downlink Power control Power system planning Process planning 3G mobile communication Radio access networks

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Implementing replica placements: Feasibility and cost minimization

Implementing replica placements: Feasibility and cost minimi...

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21st International Parallel and Distributed Processing Symposium, IPDPS 2007

作者： Loukopoulos, Thanasis Tziritas, Nikos Lampsas, Petros Lalis, Spyros Department of Computer and Communications Engineering University of Thessaly Glavani 37 38221 Volos Greece Department of Informatics and Computer Technology Technological Educational Institute of Lamia 3rd km Old Ntl. Rd. 35100 Lamia Greece

ISBN: (纸本)1424409101

Given two replication schemes Xold and Xnew, the Replica Transfer Scheduling Problem (RTSP) aims at reaching Xnew, starting from Xold, with minimal implementation cost. In this paper we generalize the problem description to include special cases, where deadlocks can occur while in the process of implementing Xnew. We address this impediment by introducing artificial (dummy) transfers. We then prove that RTSP-decision is NP-complete and propose two kinds of heuristics. The first attempts to replace dummy transfers with valid ones, while the second minimizes the implementation cost. Experimental evaluation of the algorithms illustrates the merits of our approach. ©2007 IEEE.

关键词： Scheduling

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Orientation selective contour detection using oriented motion blur

Orientation selective contour detection using oriented motio...

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2007 International Conference on Artificial Intelligence and Pattern Recognition, AIPR 2007

作者： Resko, Barna Baranyi, Péter Computer and Automation Research Institute Hungarian Academy of Sciences Cognitive Vision Research Group Hungary Budapest University of Technology and Economics Department of Automation and Applied Informatics Hungary

ISBN: (纸本)9781615677214

Cognitive informatics is a very hot topic today, trying to provide solutions to problems in computation that are easily solved by the brain but are hard for a computer. The information processing properties of the brain are taken as the basis for such artificial systems. The first step of visual information processing, the extraction of orientation selective contours, is done in the primary visual cortex. A similar, orientation based filtering can be the first step in many vision systems of cognitive informatics. This paper presents a new approach to orientation selective contour detection. Oriented motion blur is used to filter for the desired orientations. The motion blur operation is performed before digitalization, using a vibrating mirror. The proposed technique not only provides a very high speed, high resolution contour detector, but also solves the problem of contour discontinuities.

关键词： Cognitive systems

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Index-based Most Similar Trajectory Search

Index-based Most Similar Trajectory Search

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International Conference on Data Engineering

作者： Elias Frentzos Kostas Gratsias Yannis Theodoridis Department of Informatics & Research Academic Computer Technology Institute University of Piraeus Greece Department of Informatics Greece & Research Academic Computer Technology Institute University of Piraeus Greece

ISBN: (纸本)1424408024

The problem of trajectory similarity in moving object databases is a relatively new topic in the spatial and spatiotemporal database literature. Existing work focuses on the spatial notion of similarity ignoring the temporal dimension of trajectories and disregarding the presence of a general-purpose spatiotemporal index. In this work, we address the issue of spatiotemporal trajectory similarity search by defining a similarity metric, proposing an efficient approximation method to reduce its calculation cost, and developing novel metrics and heuristics to support k-most-similar-trajectory search in spatiotemporal databases exploiting on existing R-tree-like structures that are already found there to support more traditional queries. Our experimental study, based on real and synthetic datasets, verifies that the proposed similarity metric efficiently retrieves spatiotemporally similar trajectories in cases where related work fails, while at the same time the proposed algorithm is shown to be efficient and highly scalable.

关键词： Spatiotemporal phenomena Spatial databases informatics Sampling methods Approximation methods Information retrieval Cities and towns Query processing Approximation algorithms Costs

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Load Distribution Fairness in P2P Data Management Systems

Load Distribution Fairness in P2P Data Management Systems

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International Conference on Data Engineering

作者： Theoni Pitoura Peter Triantafillou Research Academic Computer Technology Institute and Computer Engineering and Informatics Department University of Patras Greece

ISBN: (纸本)1424408024

We address the issue of measuring storage, or query load distribution fairness in peer-to-peer data management systems. Existing metrics may look promising from the point of view of specific peers, while in reality being far from optimal from a global perspective. Thus, first we define the requirements and study the appropriateness of various statistical metrics for measuring load distribution fairness towards these requirements. The metric proposed as most appropriate is the Gini coefficient (G). Second, we develop novel distributed sampling algorithms to compute G on-line, with high precision, efficiently, and scalably. Third, we show how G can readily be utilized on-line by higher-level algorithms which can now know when to best intervene to correct load imbalances. Our analysis and experiments testify for the efficiency and accuracy of these algorithms, permitting the online use of a rich and reliable metric, conveying a global perspective of the distribution.

关键词： Peer to peer computing Distributed computing Load management Sampling methods technology management Engineering management Testing Data engineering informatics Algorithm design and analysis

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Substring Matching in P2P Publish/Subscribe Data Management Networks

Substring Matching in P2P Publish/Subscribe Data Management ...

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International Conference on Data Engineering

作者： Ioannis Aekaterinidis Peter Triantafillou R&A Computer Technology Institute and Department Computer Engineering and Informatics University of Patras Greece

ISBN: (纸本)1424408024

The content-based publish/subscribe (pub/sub) paradigm for system design is becoming increasingly popular, offering unique benefits for a large number of data-intensive applications. Coupled with the peer-to-peer technology, it can serve as a central building block for such applications deployed over a large-scale network infrastructure. A key problem toward the creation of large-scale content-based pub/sub infrastructures relates to dealing efficiently with continuous queries (subscriptions) with rich predicates on string attributes; in this work we study the problem of efficiently and accurately matching substring queries to incoming events.

关键词： Routing Large-scale systems Subscriptions informatics Application software Data structures Intrusion detection computer network management technology management computer networks

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