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Exploring balkanet shared ontology for multilingual conceptual indexing 4

Exploring balkanet shared ontology for multilingual conceptu...

引用

4th International Conference on Language Resources and Evaluation, LREC 2004

作者： Stamou, Sofia Nenadic, Goran Christodoulakis, Dimitris Computer Engineering and Informatics Department Patras University Patras26500 Greece Research Academic Computer Technology Institute 61 Riga Feraiou Patras26221 Greece Department of Computation UMIST Manchester United Kingdom

ISBN: (纸本)2951740816

As the size of the Web grows, it becomes an imperative to equip search engines with sophisticated indexing modules in order to enable a meaningful organization of the stored data. In this paper we present a structured multilingual conceptual repository that has been employed as the backbone of a conceptual indexing and retrieval system. Our conceptual warehouse originates from a multilingual semantic network (Balkanet) and its Inter-Lingual-Index, which was enriched with domain ontology information inherited from the SUMO ontology. We report on the ontology's design principles and provide a description of its structure. We argue that an important attribute of the Balkanet's ILI is its flexibility in incorporating new concepts and/or languages by allowing the percolation of shared semantic attributes to all concepts represented within taxonomies. We further present our approach to conceptual indexing, and introduce an indexing algorithm that utilizes Balkanet's classified conceptual taxonomies. Finally, we discuss how conceptual taxonomies can help retrieval algorithms in making links between terms used in search requests and semantically related terms that might be found in the indexed documents.

关键词： Taxonomies

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Using VR technology to support e-learning: the 3D virtual radiopharmacy laboratory

Using VR technology to support e-learning: the 3D virtual ra...

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International Conference on Distributed Computing Systems Workshop

作者： A. Alexiou C. Bouras E. Giannaka V. Kapoulas M. Nani T. Tsiatsos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

We present a virtual laboratory, which is designed and implemented in the framework of the VirRAD European project. This laboratory represents a 3D simulation of a radio-pharmacy laboratory, where learners, represented by 3D avatars, can experiment on radio-pharmacy equipment by carrying out specific learning scenarios. We describe the functionality provided by this laboratory, the motivation factors which led to its formation, the technological decisions that were made for the optimization of the system as well as the envisioned steps to be carried out.

关键词： Virtual reality Electronic learning Laboratories Virtual environment Avatars Collaborative work Educational technology Collaboration computer aided instruction Internet

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Full-Coverage Web Prediction based on Web Usage Mining and Site Topology 04

Full-Coverage Web Prediction based on Web Usage Mining and S...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： D. Oikonomopoulou M. Rigou S. Sirmakessis A. Tsakalidis Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

ISBN: (纸本)9780769521008

Understanding and modeling user online behavior, as well as predicting future requests remain an open challenge for researchers, analysts and marketers. In this paper, we propose an efficient prediction schema based on the extraction of sequential navigation patterns from server log files, combined with web site topology. Traversed paths are monitored, internally recorded and cleaned before being completed with cashed page views. After session and episode identification follows the construction of n-grams. Prediction is based upon a 5 + n-gram schema with all lower level n-grams participating, a procedure that resembles the construction of an All 5th-order Markov Model. The schema achieves full coverage while maintaining competitive prediction precision.

关键词： Topology Predictive models Data mining Navigation Association rules Prefetching Accuracy informatics File servers Monitoring

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Web page fragmentation for personalized portal construction

Web page fragmentation for personalized portal construction

引用

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

作者： B. Christos K. Vaggelis M. Ioannis Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

Web portals offer many services and wealth of content to Web users. However, most users do not find interest in all the content present in these sites. Most of them visit some specific sites and browse in specific thematic areas of them. In this paper, a software technique is presented that allows the viewers of Web sites to build their own personalized portals, using specific thematic areas of their preferred sites. This transcoding technique is based on an algorithm, which fragments a Web page in discrete fragments using the page's internal structure. A training and update procedure is used for identifying the different instances of thematic areas in different time points.

关键词： Web pages Portals HTML Algorithm design and analysis Transcoding Buildings informatics Software tools Web server Optical wavelength conversion

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Scan cell ordering for low power BIST

Scan cell ordering for low power BIST

引用

IEEE computer Society Annual Symposium on VLSI

作者： M. Bellos D. Bakalis D. Nikolos Computer Engineering & Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

Power dissipation during scan-based testing has gained significant importance in the past few years. In this work we examine the use of transition frequency based on scan cell ordering techniques in pseudorandom scan based BIST in order to reduce average power dissipation. We also propose the resetting of the input register of the circuit together with ordering of its elements to further reduce average power dissipation. Experimental results indicate that the proposed techniques can reduce average power dissipation up to 57.7%.

关键词： Built-in self-test Very large scale integration computer Society

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Efficient algorithms for handling Molecular Weighted Sequences

Efficient algorithms for handling Molecular Weighted Sequenc...

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IFIP 18th World computer Congress, TC1 and 3rd International Conference on Theoretical computer Science, TCS 2004

作者： Iliopoulos, Costas S. Makris, Christos Panagis, Yannis Perdikuri, Katerina Theodoridis, Evangelos Tsakalidis, Athanasios Department of Computer Science King's College London Strand London WC2R2LS United Kingdom Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Research Academic Computer Technology Institute 61 Riga Feraiou Str. 26221 Patras Greece

ISBN: (纸本)1402081405

In this paper we introduce the Weighted Suffix Tree, an efficient data structure for computing string regularities in weighted sequences of molecular data. Molecular Weighted Sequences can model important biological processes such as the DNA Assembly Process or the DNA-Protein Binding Process. Thus pattern matching or identification of repeated patterns, in biological weighted sequences is a very important procedure in the translation of gene expression and regulation. We present time and space efficient algorithms for constructing the weighted suffix tree and some applications of the proposed data structure to problems taken from the Molecular Biology area such as pattern matching, repeats discovery, discovery of the longest common subsequence of two weighted sequences and computation of covers. © 2004 Springer Science + Business Media, Inc.

关键词： Pattern matching

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Performance evaluation of an IPv6-capable H323 application

Performance evaluation of an IPv6-capable H323 application

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International Conference on Advanced Information Networking and Applications (AINA)

作者： C. Bouras A. Gkamas D. Primpas K. Stamos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

OpenH323 is an open source H.323 implementation that has been ported to IPv6. In this paper we briefly introduce the library architecture and the performance criteria with which the ported version should be evaluated. We then present a variety of experiments that we conducted in order to comparatively evaluate the IPv4 and IPv6 protocol stacks. We also present the results of some initial experiments comparing IPv4 and IPv6 performance under congested network links and the conclusions that they lead us to.

关键词： Protocols Libraries Internet Network address translation Quality of service Programming profession Application software informatics computer architecture Shape

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An adaptive admission control algorithm for bandwidth brokers

An adaptive admission control algorithm for bandwidth broker...

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IEEE International Symposium on Network Computing and Applications

作者： Ch. Bouras K. Stamos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

This work focuses on the operation of the bandwidth broker, an entity that is responsible for managing the bandwidth within a network domain and for the communication with bandwidth brokers of neighboring domains. A very important aspect of the bandwidth broker is its admission control module that determines whether the bandwidth reservation requests are going to be accepted or not. We summarize the status of the current research in this field and propose architecture for the admission control module that aims at achieving a satisfactory balance between maximizing the resource utilization for the network provider and minimizing the overhead of the module. This is achieved by gathering and examining sets of book-ahead requests and by adapting the size of the set to be examined so that the network utilization and the computation overhead are appropriately balanced.

关键词： Programmable control Adaptive control Admission control Bandwidth Resource management computer networks Diffserv networks computer architecture informatics Electronic mail

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Low power testing by test vector ordering with vector repetition

Low power testing by test vector ordering with vector repeti...

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IEEE International Symposium on Quality Electronic Design

作者： M. Bellos D. Bakalis D. Nikolos X. Kavousianos Computer Engineering & Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece Computer Science Department University of Ioannina (UoI) Ioannina Greece

Test vector ordering with vector repetition has been presented as a method to reduce the average as well as the peak power dissipation of a circuit during testing. Based on this method, in this paper we present some techniques that can be used to further reduce the average power dissipation. Experimental results validate that the proposed techniques achieve considerable savings in energy and average power dissipation while reducing the length of the resulting test sequences compared to the original method.

关键词： Circuit testing Power dissipation Switching circuits Energy dissipation TV Scholarships Delay System testing Power system reliability Power engineering and energy

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An efficient test vector ordering method for low power testing

An efficient test vector ordering method for low power testi...

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IEEE computer Society Annual Symposium on VLSI

作者： X. Kavousianos D. Bakalis M. Bellos D. Nikolos Computer Science Department University of Ioannina (UoI) Ioannina Greece Computer Engineering & Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

This paper presents a novel test vector ordering method for average power consumption minimization. The proposed method orders the test vectors taking into account the expected switching activity at the primary inputs and at a very small set of internal lines of the circuit under test. The computational time required by the proposed method is very small while the power reduction achieved is very close to the best, with respect to power reduction, most time-consuming method. Experimental results show that apart from average power reduction, the proposed method achieves significant peak power reduction too.

关键词： System testing Very large scale integration computer Society

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