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1st International Conference on Semantic and Digital Media Technologies, SAMT 2006

作者： Dasiopoulou, Stamatia Papadopoulos, George Th. Mylonas, Phivos Avrtihis, Yannis Kompatsiaris, Ioannis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University Thessaloniki Greece Informatics and Telematics Institute Centre for Research and Technology Greece Image Video and Multimedia Laboratory School of Electrical and Computer Engineering National Technical University Athens Greece

In this poster, we present an approach to contex-tualized semantic image annotation as an optimization problem. Ontologies are used to capture general and contextual knowledge of the domain considered, and a genetic algorithm is applied to realize the final annotation. Experiments with images from the beach vacation domain demonstrate the performance of the proposed approach and illustrate the added value of utilizing contextual information.

关键词： Ontology

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Possibilistic fusion for landcover mapping using correlated satellite imagery for environmental change 5th

Possibilistic fusion for landcover mapping using correlated ...

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Proceedings of the 5th WSEAS International Conference on Computational Intelligence, Man-Machine Systems and Cybernetics, CIMMACS '06

作者： Rashwan, Shaheera Ismail, M.A. Fouad, Soheir Informatics Research Institute MuCScat Borg ElArab Alex Egypt Computer Science Department Faculty of Engineering University of Alexandria Alexandria21544 Egypt

ISBN: (纸本)9608457564

To acquire detection performance required for an operational system in the detection for satellite image for environmental change, it is necessary to use multiple images over years to know the environmental changes over years. This paper describes a method for decision-level fusion technique where the fusion can compensate for correlation among images. The fusion is done using possibilistic combiners based on T-norms families that better represent the correlation of images. This technique was applied to Nile River Delta, Egypt (1973, 1987). These images show the dramatic urban growth within the Nile River delta and the expansion of agriculture into adjoining desert areas.

关键词： Satellite imagery

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Land cover mapping using triangular-norms 5th

Land cover mapping using triangular-norms

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Proceedings of the 5th WSEAS International Conference on Computational Intelligence, Man-Machine Systems and Cybernetics, CIMMACS '06

ISBN: (纸本)9608457564

To acquire detection performance required for an operational system in the detection for satellite image for environmental changes, it is necessary to use multiple images over years to know the environmental changes over years. This paper describes a method for decision-level fusion technique where the fusion can compensate for correlation among images. The fusion is done using possibilistic combiners based on T-norms families that better represent the correlation of images. This technique was applied to satellite images for free vegetation of Africa (1998 April 01, 1998 September 01). The performance of this technique, compared to the other techniques such as naïve Bayes, Dempster-Shafer, voting, rule-based and linear discriminant, is evaluated by simple theoretical models.

关键词： Satellite imagery

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Web Service discovery based on Quality of Service

Web Service discovery based on Quality of Service

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ACS/IEEE International Conference on computer Systems and Applications

作者： Y. Makripoulias C. Makris Y. Panagis E. Sakkopoulos P. Adamopoulou A. Tsakalidis Department of Computer Engineering & Informatics School of Engineering University of Patras Patras Greece Internet and Multimedia Technologies Research Unit Research Academic Computer Technology Institute Patras Greece

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The influence of MIMO terminal user's hand on channel capacity

The influence of MIMO terminal user's hand on channel capaci...

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European Conference on Antennas and Propagation: EuCAP 2006

作者： Zervos, T. Alexandridis, A. Peppas, K. Lazarakis, F. Dangakis, K. Soras, C. Lindmark, B. Institute of Informatics and Telecommunications National Centre for Scientific Research Demokritos Athens Greece Department of Electrical and Computer Engineering University of Patras Patras Greece Department of Signals Sensors and Systems Royal Institute of Technology Stockholm Sweden

ISBN: (纸本)9290929375

In this paper the impact of user's hand holding a Multiple-Input-Multiple- Output (MIMO) terminal on the system performance is investigated. A 4×4 MIMO system is considered with a Personal Digital Assistant (PDA) terminal equipped with a compact array of 4 patch elements. The radiation patterns of the antenna elements are simulated in the presence of the other elements and in the presence of a user's hand. The obtained patterns are used to evaluate the covariance matrix of the receive antenna which is incorporated in a correlation-based MIMO channel model. MIMO channel capacity is calculated to demonstrate the capacity degradation caused by the user's hand.

关键词： Channel capacity

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Efficient Test-Data Compression for IP Cores Using Multilevel Huffman Coding 06

Efficient Test-Data Compression for IP Cores Using Multileve...

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Design, Automation and Test in Europe Conference and Exhibition

作者： X. Kavousianos E. Kalligeros 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

ISBN: (纸本)9783981080100

In this paper we introduce a new test-data compression method for IP cores with unknown structure. The proposed method encodes the test data provided by the core vendor using a new, very effective compression scheme based on multilevel Huffman coding. Specifically, three different kinds of information are compressed using the same Huffman code, and thus significant test data reductions are achieved. A simple architecture is proposed for decoding on-chip the compressed data. Its hardware overhead is very low and comparable to that of the most efficient methods in the literature. Additionally, the proposed technique offers increased probability of detection of unmodeled faults since the majority of the unknown values of the test set are replaced by pseudorandom data generated by an LFSR.

关键词： Huffman coding System testing Hardware Decoding Performance evaluation Educational programs Logic informatics Fault detection Time to market

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The Power of the Defender

The Power of the Defender

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International Conference on Distributed Computing Systems Workshop

作者： M. Gelastou M. Mavronicolas V. Papadopoulou A. Philippou P. Spirakis Department of Computer Science University of Cyprus Nicosia Cyprus Department of Computer Engineering and Informatics University of Patras Patras Greece Greece and Research and Academic Computer Technology Institute Patras Greece

We consider a security problem on a distributed network. We assume a network whose nodes are vulnerable to infection by threats (e.g. viruses), the attackers. A system security software, the defender, is available in the system. However, due to the network’s size, economic and performance reasons, it is capable to provide safety, i.e. clean nodes from the possible presence of attackers, only to a limited part of it. The objective of the defender is to place itself in such a way as to maximize the number of attackers caught, while each attacker aims not to be caught. In [7], a basic case of this problem was modeled as a non-cooperative game, called the Edge model. There, the defender could protect a single link of the network. Here, we consider a more general case of the problem where the defender is able to scan and protect a set of k links of the network, which we call the Tuple model. It is natural to expect that this increased power of the defender should result in a better quality of protection for the network. Ideally, this would be achieved at little expense on the existence and complexity of Nash equilibria (profiles where no entity can improve its local objective unilaterally by switching placements on the network). In this paper we study pure and mixed Nash equilibria in the model. In particular, we propose algorithms for computing such equilibria in polynomial time and we provide a polynomial-time transformation of a special class of Nash equilibria, called matching equilibria, between the Edge model and the Tuple model, and vice versa. Finally, we establish that the increased power of the defender results in higher-quality protection of the network.

关键词： Protection Power system security computer viruses Power generation economics Polynomials Probability distribution Software systems Safety Contracts computer science

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Approximation algorithms for path coloring in trees

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2006年 3484 LNCS卷 74-96页

作者： Caragiannis, Ioannis Kaklamanis, Christos Persiano, Giuseppe Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras 26500 Rio Greece Dipartimento di Informatica ed Applicazioni Università di Salerno 84081 Baronissi Italy

ISBN: (纸本)3540322124

The study of the path coloring problem is motivated by the allocation of optical bandwidth to communication requests in all-optical networks that utilize Wavelength Division Multiplexing (WDM). WDM technology establishes communication between pairs of network nodes by establishing transmitter-receiver paths and assigning wavelengths to each path so that no two paths going through the same fiber link use the same wavelength. Optical bandwidth is the number of distinct wavelengths. Since state-of-the-art technology allows for a limited number of wavelengths, the engineering problem to be solved is to establish communication minimizing the total number of wavelengths used. This is known as the wavelength routing problem. In the case where the underlying network is a tree, it is equivalent to the path coloring problem. We survey recent advances on the path coloring problem in both undirected and bidirected trees. We present hardness results and lower bounds for the general problem covering also the special case of sets of symmetric paths (corresponding to the important case of symmetric communication). We give an overview of the main ideas of deterministic greedy algorithms and point out their limitations. For bidirected trees, we present recent results about the use of randomization for path coloring and outline approximation algorithms that find path colorings by exploiting fractional path colorings. Also, we discuss upper and lower bounds on the performance of on-line algorithms. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Approximation algorithms

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Distribution and partitioning techniques for NVEs: the case of EVE

Distribution and partitioning techniques for NVEs: the case ...

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International Workshop on Challenges of Large Applications in Distributed Environments

作者： C. Bouras E. Giannaka A. Panagopoulos T. Tsiatsos Computer Engineer and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece Computer Science Department Stony Brook University New York USA

The majority of the systems and platforms developed for supporting distributed virtual environments are based on the concept of distribution from the early beginning of their development. In this paper we present the migration to a distributed virtual environment from a traditional client-server architecture. In particular, this paper describes the case of EVE, a networked virtual environment originally aimed to support small-scale applications. EVE started as a standard client-multi server architecture, which could support multiple concurrent virtual worlds with a maximum number of seventeen simultaneous participants in each of these worlds. However, the need to support larger-scale applications revealed that the traditional architecture, upon which EVE was based, is insufficient to meet the needs of these applications, which are large both in the sense of virtual space and graphics and in regard to the number of concurrent participants. This paper discusses the migration of EVE to a distributed platform, which is able to support large-scale networked virtual environments. In particular, the paper describes the modifications realized in the architectural model of the initial platform for supporting effectively large-scale applications. The basic entities of the distributed model are presented, their operations, as well as the interconnection among them. In addition, the paper presents an initial approach of the algorithm that is adopted for the efficient partitioning of the virtual world and the assignment of the clients to the entities and resources of the distributed platform. The approach presented is space-object driven, in the sense that both the actual size of the virtual space along with the number of objects with which the user can interact is taken into account during the partitioning

关键词： computer aided software engineering Virtual environment Large-scale systems Graphics Space technology informatics Protocols Network servers Partitioning algorithms computer science

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Terahertz Semiconductor Quantum Well Devices

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Journal of Semiconductors 2006年第4期27卷 627-634页

作者： Liu H C Luo H Ban D Waichter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q Institute for Microstructural Sciences National Research Council Ottawa K1A 0R6 Canada State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese AcademyofSciences Shanghai 200050 China Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

For eventually providing terahertz science with compact and convenient devices,terahertz (1～10THz) quantum-well photodetectors and quantum-cascade lasers are *** design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical *** limited infrared performance (BLIP) operations are observed for all samples (three in total),designed for different *** temperatures of 17,13,and 12K are achieved for peak detection frequencies of 9.7THz(31μm),5.4THz(56μm),and 3.2THz(93μm),respectively.A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is *** δ-doping density for each period varies from 3.2×1010 to 4.8×*** observe that the lasing threshold current density increases monotonically with doping ***,the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase *** the observed maximum lasing temperature is best at a doping density of 3.6×1010cm-2.

关键词：半导体量子论激光技术光电探测器

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