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Deployment of broadband infrastructure in the region of Western Greece

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

引用

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

引用

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...

引用

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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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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Special issue on the 2nd PGTS 2002

Special issue on the 2nd PGTS 2002

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作者： Kuhn, Paul J. Lehnert, ralf Pioro, Michal Wozniak, Josef Killat, Ulrich Institute of Communication Networks and Computer Engineering University of Stuttgart Pfaffenwaldring 47 70569 Stuttgart Germany Technische Universitaet Dresden Lehrsthul fuer Telekommunikation Department of Electrical Engineering Telecommunications Mommsenstr. 13 D-01062 Dresden Germany Department of Computer Networks and Switching Institute of Telecommunications Warsaw University of Technology Warsaw Poland Department of Communication Systems Lund University PO Box 118 SE-22100 Lund Sweden Gdansk University of Technology Faculty of Electronics Telecommunications and Informatics 11/12 Narutowicza Str 80-952 Gdansk Poland Kommunikationsnetze AB 4-06 TU Hamburg-Harburg D-21071 Hamburg Germany

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A genetic algorithm-based approach to knowledge-assisted video analysis

A genetic algorithm-based approach to knowledge-assisted vid...

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IEEE International Conference on Image Processing

作者： N. Voisine S. Dasiopoulou F. Precioso V. Mezaris I. Kompatsiaris M.G. Strintzis Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

Efficient video content management and exploitation requires extraction of the underlying semantics, a non-trivial task associating low-level features of the image domain and high-level semantic descriptions. In this paper, a knowledge-assisted approach for extracting semantics of domain-specific video content is presented. Domain knowledge considers both low-level features (color, motion, shape) and spatial behavior (topological and directional information). During the preprocessing step, a set of over-segmented homogenous atom-regions is generated and their low-level and spatial descriptions are extracted. A genetic algorithm is then applied in order to find the optimal interpretation according to a specific domain conceptualization. The proposed approach was tested on the formula one, tennis and beach vacations domains showing promising results.

关键词： Algorithm design and analysis Data mining Ontologies Genetic algorithms Object detection Content management Feature extraction Knowledge representation Semantic Web Laboratories

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Fault Diagnosis of Hybrid Systems

Fault Diagnosis of Hybrid Systems

引用

IEEE International Symposium on Intelligent Control (ISIC)

作者： G.K. Fourlas K.J. Kyriakopoulos N.J. Krikelis Department of Informatics and Computer Technology Technological Educational Institute (TEI) of Lamia Lamia Greece Control Systems Laboratory Mechanical Engineering Department National and Technical University of Athens Athens Greece

Fault diagnosis is a challenging task in the control of hybrid systems. In this work we present a methodology for detection and isolation of faults to hybrid control systems using a diagnoser. For this purpose a general framework is proposed. We discuss the notion of diagnosability of hybrid systems in the framework of hybrid input output automata (HIOA), imposing the conditions for a hybrid system to be diagnosable. The diagnoser is designed using hybrid structure hypothesis tests. The states of the hybrid system model reflect the normal and the failed status of the system components. This approach is applicable to a wide range of real systems since hybrid systems involve both continuous and discrete dynamics

关键词： Fault diagnosis Control systems Automatic control Power system dynamics Fault detection Automata Testing Power system reliability Power system management Hybrid power systems

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An e-learning system for improving learner study efficiency by stimulating learner volition

An e-learning system for improving learner study efficiency ...

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： S. Takahama N. Nakamura L. Barolli A. Koyama A. Durresi K. Sugita Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Informatics Faculty of Engineering Yamagata University Yonezawa Yamagata Japan Department of Computer Science Louisiana State University Baton Rouge LA USA

Due to the opportunities provided by the Internet, more and more people are taking advantage of distance learning courses and during the last few years enormous research efforts have been dedicated to the development of distance learning systems. So far, many e-learning systems are proposed and used practically. However, in these systems the e-learning completion rate is about 30 percents. One of the reasons is the low study desire when the learner studies the learning materials. In this research, we propose an e-learning system, which includes three subsystems: the learning subsystem, learner support subsystem, and teacher support subsystem. The learning subsystem improves the learners study desire. The learner support subsystem supports the learner during the study, and the teacher support subsystem support the teacher to get the learner's study state. In the future work, we would like to add other functions to improve more the system performance.

关键词： Electronic learning computer aided instruction Electronic mail Internet computer science education informatics computer science System performance Control systems Costs

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