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An Object Driven Partitioning Approach for Distributed Virtual Environments

An Object Driven Partitioning Approach for Distributed Virtu...

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IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Christos Bouras Eri Giannaka Thrasyvoulos Tsiatsos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

Distributed virtual environments tend to become a de facto solution for large-scale networked virtual environments. One of the key issues and problems that need to be handled in the design of a scalable and effective distributed virtual environment system is the partitioning problem, which refers to the efficient assignment of the system's workload to the available resources of the system. This paper presents an object driven partitioning approach based on the partitioning algorithm of Lui & Chan, who proposed a three step technique for balancing the workload among the servers of the Distributed Virtual Environment.

关键词： Virtual environment Partitioning algorithms Costs Avatars Distributed computing computer networks Concurrent computing informatics Large-scale systems Application software

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A Decentralized Intrusion Detection System for Increasing Security of Wireless Sensor Networks

A Decentralized Intrusion Detection System for Increasing Se...

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12th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2007), vol.3

作者： Ioannis Chatzigiannakis Andreas Strikos Research Academic Computer Technology Institute (RACTI) and Computer Engineering and Informatics Department University of Patras Greece School of Information and Communication Technology KTH Stockholm Sweden

Large-scale sensor networks, monitoring an environment at close range with high spatial and temporal resolutions are expected to play an important role in various applications, e.g., assessing the "health" of machines;environmental, medical, food-safety, and habitat monitoring;inventory control, building automation, etc. Ensuring the security of these complex and yet resource-constrained systems has emerged as one of the most pressing challenges for researchers. In this paper (i) we present the major threats, and (ii) we present a new approach for decentralized energy efficient intrusion detection that can be used to improve security from both external and internal adversaries.

关键词： Intrusion detection Wireless sensor networks Biomedical monitoring computerized monitoring Condition monitoring Large-scale systems Spatial resolution Inventory control Automation Pressing

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Defending Wireless Sensor Networks from Jamming Attacks

Defending Wireless Sensor Networks from Jamming Attacks

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Aristides Mpitziopoulos Damianos Gavalas Grammati Pantziou Charalampos Konstantopoulos Department of Cultural Technology and Communication University of Aegean Mytilene Greece Research Academic Computer Technology Institute and Department of Computer Engineering and Informatics University of Patras Rio Greece

Wireless sensor networks (WSNs) are used in many applications which often include the monitoring and recording of sensitive information. Hence, their critical importance raises many security concerns. In the context of WSNs, jamming is the type of attack which interferes with the radio frequencies used by network nodes. In the event that an attacker uses a rather powerful jamming source, disruptions of WSNs proper function are likely to occur. As a result, the use of countermeasures against jamming in WSN environments is of immense importance. The main contribution of this article is the discussion of various defence methods against jamming that would allow a WSN to survive and work properly in a hostile jamming environment. Our focus is on frequency hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSS), two of the most effective countermeasures against jamming. We suggest the use of a specific FHSS technique in 5 GHz band with 55 frequency channels wherein the channel sequence is generated using a secret word, known only to the sink and the sensor nodes, as a seed. Each channel uses DSSS modulation with 16 bit Pseudo Noise (PN) code, which derives from the same secret word used for FHSS channel generation.

关键词： Wireless sensor networks Jamming Spread spectrum communication Educational technology Mobile communication Protocols Cultural differences Global communication Communications technology informatics

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Business Models for Broadband Municipal Optical Networks: A Proposed Model for the Greek Case

Business Models for Broadband Municipal Optical Networks: A ...

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IEEE Symposium on computers and Communications (ISCC)

作者： Christos Bouras Apostolos Gkamas John Papagiannopoulos George Theophilopoulos Thrasyvoulos Tsiatsos Computer Engineering and Informatics Dept University of Patras Greece Research Academic Computer Technology Institute Greece Department of Information and Communication Systems Engineering University of Aegean Greece Department of Informatics Aristotle University of Thessaloniki Greece

This paper proposes a business model for the successful operation of the currently developing broadband metropolitan area networks in Greece. Having recorded and examined relevant international practices, we describe in detail the way that these networks should be managed, operated, maintained and expanded. Taking into consideration that these infrastructures will alter the broadband map of Greece widely, that Greece currently has one of the lowest broadband penetration percentages in Europe and that the proper exploitation of the networks to be deployed could boost the demand for broadband connections and applications, the proposition of the business model appears to be of vital importance. We present the proposed business model in detail including information regarding network management and network expansion of the broadband metropolitan networks and viability issues regarding the authority which will manage the broadband metropolitan networks.

关键词： Optical fiber networks Telecommunication services Metropolitan area networks Business communication computer networks Optical computing Cities and towns Internet Costs informatics

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Learning context-specific gene regulatory networks via in-siuco conditioning

Learning context-specific gene regulatory networks via in-si...

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5th IEEE International Workshop on Genomic Signal Processing and Statistics, GENSIPS'07

作者： Kim, Seungchan Roy, Ina Raghavan, Siddharth Dougherty, Edward R. Bittner, Michael School of Computing and Informatics Arizona State University Tempe AZ United States Translational Genomics Research Institute Phoenix AZ United States Dept. of Electrical and Computer Engineering Texas A and M University College Station TX United States

ISBN: (纸本)1424409993

Cell adjusts its regulatory machinery in response to environmental changes to maintain its basic functionality. Different cellular conditions require different regulatory mechanisms that tightly regulate genes. Due to this tightly coordinated regulation, the expression of those genes should show consistent patterns within the same cellular contexts while such consistency disappears when corresponding context is disrupted. Based on previously developed statistics to identify genes whose expression pattern is significantly more consistent within a specific biologic context, we have developed an algorithm to identify novel cellular contexts and learn underlying context-specific gene regulatory networks. ©2007 IEEE.

关键词： Machinery

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Trust in global computing systems as a limit property emerging from short range random interactions

Trust in global computing systems as a limit property emergi...

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International Conference on Availability, Reliability and Security, ARES

作者： V. Liagkou E. Makri P. Spirakis Y.C. Stamatiou Department of Computer Engineering and Informatics University of Patras Greece Research Academic Computer Technology Institute Greece Department of Mathematics University of Aegean Greece Department of Computer Engineering and Informatics University of Patras Patras Greece Mathematics Department University of Ioannina (UoI) Greece

ISBN: (纸本)9780769527758;0769527752

Today we are experiencing a major reconsideration of the computing paradigm, as witnessed by the abundance and increasing frequency of use of terms such as ambient intelligence, ubiquitous computing, disappearing computer, grid computer, global computing and mobile ad-hoc networks. Systems that can be described with such terms are of a dynamic, with no clear physical boundary, nature and it seems that it is impossible (or, at least, difficult) to define sharply a number of important properties holding with certainty as well as holding throughout the whole lifetime of the system. One such system property, which is important for the viability of a system, is trust. Our departure point is the assumption that it seems very difficult to define static system properties related to trust and expect that they hold eternally in the rapidly changing systems falling under the new computing paradigm. One should, rather, attempt to define trust in terms of properties that hold with some limiting probability as the system grows and try to establish conditions that ensure that "good" properties hold almost certainly. Based on this viewpoint, in this paper we provide a new framework for defining trust through formally definable properties that hold, almost certainly, in the limit in randomly growing combinatorial structures that model "shapeless" computing systems (e.g., ad-hoc networks), drawing on results that establish the threshold behavior of predicates written in the first and second order logic

关键词： computer networks Grid computing Pervasive computing informatics Mathematics Ad hoc networks Logic Mechanical factors Protocols Management information systems

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Exploiting virtual objects' attributes and avatar's behavior in DVEs partitioning

Exploiting virtual objects' attributes and avatar's behavior...

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International Conference on Artificial Reality and Telexistence (ICAT)

作者： Christos Bouras Eri Giannaka Thrasyvoulos Tsiatsos Computer Engineering and Informatics Department University of Patras Patras Greece University of Patras Patras GR Research Academic Computer Technology Institute University of Patras Patras Greece Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

Partitioning constitutes one of the most critical challenges a distributed virtual environment needs to handle and is related to the efficient assignment of the existing entities of the virtual world to the available resources of the system. The efficient partitioning arises from the need of high consistency maintenance among participating users' view, as virtual reality applications are characterized by the high degree of realism they aim to achieve. To the direction of partitioning algorithms, a lot of work has been done, which has been more intense due to the evolution of network technologies and the familiarization of users with virtual reality systems. This paper presents a partitioning approach, which is based on the degree of interaction of each virtual object and the behavior of the participating users, in terms of moving trends, which is usually directed by the actions they can perform on the surrounding objects. In particular, the partitioning takes place when the virtual world contains only objects, in the sense that no avatars are yet connected and objects' attributes are handled as indicators for avatars' future behavior in the system. This prediction of avatars' behavior based on objects' attributes defines the initial partitioning of the virtual space.

关键词： Virtual environment Avatars Partitioning algorithms Virtual reality Network servers Distributed computing informatics Large-scale systems Negative feedback Costs

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Word sense disambiguation using inductive logic programming

Word sense disambiguation using inductive logic programming

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16th International Conference of Inductive Logic Programming, ILP 2006

作者： Specia, Lucia Srinivasan, Ashwin Ramakrishnan, Ganesh Das Graças Volpe Nunes, Maria ICMC University of São Paulo Trabalhador São-Carlense 400 São Carlos 13560-970 Brazil IBM India Research Laboratory Indian Institute of Technology Block 1 New Delhi 110016 India Dept. of Computer Science and Engineering Centre for Health Informatics University of New South Wales Sydney Australia

ISBN: (纸本)9783540738466

The identification of the correct sense of a word is necessary for many tasks in automatic natural language processing like machine translation, information retrieval, speech and text processing. Automatic Word Sense Disambiguation (WSD) is difficult and accuracies with state-of-the art methods are substantially lower than in other areas of text understanding like part-of-speech tagging. One shortcoming of these methods is that they do not utilize substantial sources of background knowledge, such as semantic taxonomies and dictionaries, which are now available in electronic form (the methods largely use shallow syntactic features). Empirical results from the use of Inductive Logic Programming (ILP) have repeatedly shown the ability of ILP systems to use diverse sources of background knowledge. In this paper we investigate the use of ILP for WSD in two different ways: (a) as a stand-alone constructor of models for WSD;and (b) to build interesting features, which can then be used by standard model-builders such as SVM. In our experiments we examine a monolingual WSD task using the 32 English verbs contained in the SENSEVAL-3 benchmark data;and a bilingual WSD task using 7 highly ambiguous verbs in machine translation from English to Portuguese. Background knowledge available is from eight sources that provide a wide range of syntactic and semantic information. For both WSD tasks, experimental results show that ILP-constructed models and models built using ILP-generated features have higher accuracies than those obtained using a state-of-the art feature-based technique equipped with shallow syntactic features. This suggests that the use of ILP with diverse sources of background knowledge can provide one way for making substantial progress in the field of automatic WSD. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Logic programming

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Towards pragmatic patterns for clinical knowledge management 07

Towards pragmatic patterns for clinical knowledge management

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2nd International Conference on the Pragmatic Web: "Building Common Ground on the Web", ICPW '07

作者： Falkman, Göran Gustafsson, Marie Jontell, Mats Torgersson, Olof School of Humanities and Informatics University of Skövde P.O. Box 408 SE-541 28 Skövde Sweden Dept. of Computer Science and Engineering Chalmers University of Technology SE-412 96 Göteborg Sweden Institute of Odontology Sahlgrenska Academy Göteborg University P.O. Box 450 SE-405 30 Göteborg Sweden Dept. of Computer Science and Engineering Göteborg University SE-412 96 Gteborg Sweden

ISBN: (纸本)9781595938596

We present a research program for identifying, modeling, and making use of generic pragmatic patterns for clinical knowledge management that support evidence-based medicine (EBM). Part of this program is SOMWeb, a system based on Semantic Web technologies, which is used for knowledge sharing and dissemination within an oral medicine community. A study of the use of SOMWeb has been conducted as the first step in the elicitation of important contextual factors and communicative activities involved in knowledge sharing processes in oral medicine. One such activity, community discussion activation, is described using consultation patterns together with the collaboration patterns of [5]. The general need for context-aware health information systems and the prospective use of approaches within Pragmatic Web in the pursuit of EBM are also discussed. Copyright 2007 ACM.

关键词： Semantic Web

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Multimodal fusion for cued Speech language recognition

Multimodal fusion for cued Speech language recognition

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European Signal Processing Conference (EUSIPCO)

作者： Savvas Argyropoulos Dimitrios Tzovaras Michael G. Strintzis Aristotle University of Thessaloniki Thessaloniki GR Informatics and Telematics Institute Centre for Research and Technology Hellas Thermi-Thessaloniki Hellas Electrical and Computer Engineering Dept. Aristotle University of Thessaloniki Thessaloniki Hellas

In this paper, a novel method for Cued Speech language recognition is proposed. A multimodal processing framework is developed for the efficient fusion of the modalities under consideration. The robust feature extraction from the audio, lip shape and gesture modalities is also discussed. Moreover, the inherent correlation among the signals is modelled using a modified Coupled Hidden Markov Model. The contribution of each modality to the fused decision is modified by assessing its reliability and assigning a weighting factor to improve the accuracy of the recognized words. The method is experimentally evaluated and is shown to outperform methods that rely only on the perceivable information to infer the transmitted messages.

关键词： Speech recognition Shape Speech Hidden Markov models Feature extraction Reliability Gesture recognition

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