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Station placement in networks

Station placement in networks

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作者： Galdi, Clemente Kaklamanis, Christos Montangero, Manuela Persiano, Giuseppe Italy Computer Technology Institute Department of Computer Engineering and Informatics University of Patras 26500 Rio Greece Istituto di Informatica e Telematica CNR Via Moruzzi 1 56124 Pisa Italy Facoltà di Scienze della Comunicazione e dell'Economia Università di Modena e Reggio Emilia 42100 Reggio Emilia Italy

In this paper we study the Station Placement problem on directed graphs, a problem that has applications to efficient multicasting in circuit-switched networks. We first argue that the problem on general directed graphs can be efficiently reduced to computing bounded depth Steiner tree on complete weighted directed graphs. Then, we concentrate on the case in which the graph is a directed tree and we give polynomial time algorithms to solve the problem and a natural variant of the problem. © World Scientific Publishing Company.

关键词： computer networks

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Capturing application-domain specific patterns in a Web application: The e-learning paradigm

Capturing application-domain specific patterns in a Web appl...

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4th IASTED International Conference on Web-Based Education, WBE 2005

作者： Dimitrakopoulou, Dimitra Rigou, Maria Sirmakessis, Spiros Tsakalidis, Athanasios Tzimas, Giannis Research Academic Computer Technology Institute Internet and Multimedia Technologies Research Unit 61 Riga Feraiou str. GR-262 21 Patras Hellas Greece University of Patras Computer Engineering and Informatics Department GR-26504 Rio-Patras Hellas Greece Technological Educational Institution of Messolongi Nea Ktiria GR-30200 Messolongi Hellas Greece

ISBN: (纸本)0889864802

Designing and maintaining Web applications is one of the major challenges that software industry has to face. Several modeling techniques have been proposed to support this process. In this work we present a methodology for identifying design patterns within an application modelled using WebML, a modelling language for designing data-intensive Web applications. We extend the set of design patterns supported by WebML and exemplify the application of the methodology using an e-learning scenario.

关键词： E-learning

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Performance enhancement of an AF service using TCP-aware marking and dynamic WRED

Performance enhancement of an AF service using TCP-aware mar...

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IEEE Symposium on computers and Communications (ISCC)

作者： C. Bouras A. Sevasti Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece Greek Research and Technology Network S. A. Athens Greece

The implementation of successful assured forwarding (AF) services according to the DiffServ framework remains a challenging problem today, despite the numerous proposals for AF PHB mechanisms and AF-based service implementations. In this work, we propose two modules, the TCP-window aware marker (TWAM) and the dynamic WRED (DWRED) mechanism for implementing the DiffServ AF PHB. We provide analytical models and an experimental evaluation in order to demonstrate how they succeed in enhancing the quality, increasing fairness, improving the performance and easing the deployment of a production- level AF-based service.

关键词： Traffic control Diffserv networks computer networks informatics Proposals Analytical models Spine Telecommunication traffic Bandwidth Statistics

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Deployment of broadband infrastructure in the region of Western Greece

Deployment of broadband infrastructure in the region of West...

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International Conference on Broadband Networks (BroadNets)

作者： A. Alexiou C. Bouras V. Igglesis V. Kapoulas M. Paraskeuas I. Scopoulis J. Papagiannopoulos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece University of Ioannina (UoI) Greece University of Aegean Greece

This paper presents the work that is taking place in the Region of Western Greece in order to develop state-of-the-art broadband infrastructure. The current status of broadband infrastructure in the region is being analyzed and the main principles on which the deployment of the networks will be based on is being described, by presenting the metropolitan area networks and the wireless access networks that will be developed. Two case studies of such municipal networks are also presented in this paper

关键词： Metropolitan area networks High speed optical techniques Wireless networks Optical fibers Instruments Broadband communication Telecommunication services Communications technology Wavelength division multiplexing informatics

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A Robust BPCS-Steganography against the Visual Attack

A Robust BPCS-Steganography against the Visual Attack

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International Conference on Information, Communications and Signal Processing

作者： M. Niimi H. Noda B. Segee Department of Systems Innovation and Informatics Kyushu Institute of Technology Lizuka Japan Electrical & Computer Engineering Department University of Maine Orono ME USA

This paper discusses a visual attack to BPCS-Steganography (Bit-Plane Complexity Segmentation-Steganography) and presents a countermeasure. BPCS categorizes each small block within cover images into either a "noise-like region" or an "informative region" by means of the binary-image feature called complexity and replaces noisy blocks with the binary patterns mapped from the bit sequences of secret data. The binary patterns must be complex because it is replacing complex regions. If the binary patterns to be inserted are simple, then the logical operation called conjugate operation is applied that transforms a simple pattern to a complex pattern. We need to keep, for each block, the flag called a conjugation flag representing whether or not conjugation had been applied to correctly extract the embedded information. In the case where the conjugation flags must be embedded within cover images, we are unable to use the complexity thresholding for the embedding of the flags. Thus the flags must be embedded into a fixed area. To this effect it is easy to recognize unnatural patterns on the LSB plane of stego-images. It can be used as a signature or a distinguishing mark between natural images and images with information embedded by BPCS. We propose secure BPCS which is robust against the visual attack. It is realized by assigning the meaning of the conjugation flag to a pixel of each block and making the specific rule to embed and extract it

关键词： Robustness Steganography Data mining Image segmentation Technological innovation informatics Pattern recognition Art Digital images Humans

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Adaptive pricing functions for open outcry auctions

Adaptive pricing functions for open outcry auctions

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IEEE/WIC/ACM International Conference on Intelligent Agent technology (IAT)

作者： D. Kehagias P.A. Mitkas Center for Research and Technology Hellas Informatics and Telematics Institute Thermi Greece Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

In agent-mediated marketplaces, autonomous agents deploy automated bidding mechanisms in order to increase revenue for humans. The ability of agents to estimate the next prices to be revealed in an auction, by applying forecasting, is a key element for efficient and successful bidding. In open outcry auctions, such as English and Dutch, information about bidders behavior is revealed at each round. This paper proposes a bid calculation function based on forecasting of the next price in English and Dutch auctions. The forecasting is based on two linear adaptive filters for stochastic estimation, whose parameters are calculated using a genetic algorithm. In order to test the efficiency of the two bidding methods and to benchmark the performance of the two filters, we conduct a set of experiments and present the results.

关键词： Pricing Nonlinear filters Adaptive filters Stochastic processes Autonomous agents Genetic algorithms Predictive models informatics

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Energy Management in Mobile and Pervasive Computing Systems

Energy Management in Mobile and Pervasive Computing Systems

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： G. Anastasi M. Conti M. Kumar Department of Information Engineering University of Pisa Italy Institute for Informatics and Telematics National Research Council Canada Italy Department of Computer Science and Engineering University of Technology Arlington USA

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Context awareness via a single device-attached accelerometer during mobile computing 05

Context awareness via a single device-attached accelerometer...

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7th International Conference on Human computer Interaction with Mobile Devices and Services, MobileHCI 05

作者： Yi, Ji Soo Choi, Young Sang Jacko, Julie A. Sears, Andrew Laboratory of Human Computer Interaction and Health Care Informatics School of Industrial and Systems Engineering Georgia Institute of Technology 765 Ferst Drive NW Atlanta GA 30332 United States Interactive Systems Research Center Information Systems Department UMBC 1000 Hilltop Circle Baltimore MD 21250 United States

ISBN: (纸本)1595930892

Interest in context-aware computing has expanded the use of sensing technologies. The accelerometer is one of the most widely used sensors for capturing context because it is small, inexpensive, lightweight, and self-operable. In efforts to obtain behavioral patterns, many studies have reported the use of multiple accelerometers attached to the human body. However, this is difficult to implement in real-life situations and may not fully address the context of user interaction. In contrast, the present study employed a single tri-axial accelerometer attached to a handheld computing device instead of to a user. The objective was to determine what contextual information could be obtained from this more feasible, albeit limited, source of acceleration data. Data analyses confirmed that changes in both mobility and lighting conditions induced statistically significant differences in the output of the accelerometer. Copyright 2005 ACM.

关键词： Accelerometers

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NIPPERS: network of interpolated PeERS for Web service discovery

NIPPERS: network of interpolated PeERS for Web service disco...

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International Conference on Information technology: Coding and Computing (ITCC)

作者： C. Makris E. Sakkopoulos S. Sioutas P. Triantafillou A. Tsakalidis B. Vassiliadis Computer Engineering & Informatics Department University of Patras Patras Greece Internet and Multimedia Technologies Research Unit RA Computer Technology Institute Patras Greece Computer Science Digital Systems & Media Computing Laboratory Hellenic Open University Patras Greece

Web services are becoming an important enabler of the semantic Web. Besides the need for a rich description mechanism, Web service information should be made available in an accessible way for machine processing. In this paper, we propose a new P2P based approach for Web services discovery. Peers that store Web services information, such as data item descriptions, are efficiently located using a scalable and robust data indexing structure for peer-to-peer data networks, NIPPERS. We present a theoretical analysis which shows that the communication cost of the query and update operations scale double-logarithmically with the number of NIPPERS nodes. Furthermore, we show that the network is robust with respect to failures fulfilling quality of Web services requirements.

关键词： Web services Peer to peer computing Robustness Costs Interpolation Tree data structures Web and internet services Multimedia systems Multimedia computing informatics

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Ontology-Based Access to Multimedia Cultural Heritage Collections - The REACH Project

Ontology-Based Access to Multimedia Cultural Heritage Collec...

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Eurocon

作者： C. Doulaverakis Y. Kompatsiaris M.G. Strintzis Centre for Research and Technology Informatics and Telematics Institute Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

In this paper, an approach for providing unified access to heterogeneous distributed cultural heritage collections is presented. The proposed approach is developed within the framework of the REACH Greek National Project with the overall aim to provide a Web portal enabling access to different databases of cultural content with emphasis on multimedia material. In order to achieve this, the project employs ontology-based representation of cultural content, multimedia content-based search algorithms, hybrid ontology and content-based access and user-friendly search interfaces. This fusion approach provides users with resources for building queries of multimedia repositories sequentially using multiple individual search tools, and performs higher quality searching. In the current stage of development, real content such as inscriptions and coins from the Greco-Roman time period, has successfully been incorporated in the system

关键词： Ontologies Cultural differences Portals Multimedia databases Information retrieval Content based retrieval Material storage Multimedia systems informatics Telematics

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