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A spatiotemporal view of transactional data for data mining

WSEAS Transactions on Information Science and Applications 2005年第8期2卷 1179-1183页

作者： Kouris, Ioannis N. Makris, Christos H. Tsakalidis, Athanasios K. Department of Computer Engineering and Informatics School of Engineering University of Patras 26500 Patras Greece Computer Technology Institute P.O. Box 1192 26110 Patras Greece

Transactional-retail data, probably the data with the largest scientific and financial interest, still remains the most examined data category in the field of data mining. The prominent model for handling such data has long been a rather naïve one that treated items as flat Boolean variables, ordered in various ways in order to facilitate efficient counting and to reduce complexity. In this work we propose a novel view of transactional data for data mining, which is based on a spatial, a temporal or a spatiotemporal component inherent in such data. Finally we propose a method for handling this data efficiently.

关键词： Data mining

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Adaptive pricing functions for open outcry auctions

Adaptive pricing functions for open outcry auctions

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2005 IEEE/WIC/ACM International Conference on Intelligent Agent technology

作者： Kehagias, Dionisis Mitkas, Pericles A. Informatics and Telematics Institute Center for Research and Technology Hellas 1st km Thermi-Panorama road 57 001 Thermi Greece Department of Electrical and Computer Engineering Aristotle University of Thessaloniki 54 124 Thessaloniki Greece

ISBN: (纸本)0769524168

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. © 2005 IEEE.

关键词： Adaptive systems

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Spatial indexing structures

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WSEAS Transactions on Information Science and Applications 2005年第7期2卷 971-975页

作者： Kouris, J. Theodoridis, E. Tsakalidis, A. Computer Engineering and Informatics Department University of Patras 26500 Patras Greece Research Academic Computer Technology Institute 61 Riga Feraiou St. 26221 Patras Greece

In this paper we survey the most well known and widely used indexing structures for handling spatial information using both main memory and secondary media. We focus on the presentation of spatial object indexing structures and then we cite a number of applications that they can be used. We have paid attention to the variety of queries that each of these structures can answer and their price in computational time and memory space occupation.

关键词： Data structures

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WiFiAdmin: an intelligent Web-based management environment for wireless networks

WiFiAdmin: an intelligent Web-based management environment f...

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International Conference on Information technology and Applications, ICITA

作者： E. Dimopoulos A. Panousis E. Sakkopoulos A. Tsakalidis Internet and Multimedia Technologies Research Unit RA Computer Technology Institute Greece Computer Engineering & Informatics Department University of Patras Patras Greece

Wireless network communities face a number of difficulties due to lack of integration between network and community resources management. In this work, we present a novel solution and we outline the architecture, design and implementation of an intelligent Web based management system for metropolitan area wireless network communities. The system supports multi-user and personalization features combined with wireless node configuration and monitoring, in a portal-like environment. Additionally to the software discussed, a test-bed implementation is presented to confirm platform and software robustness and cost-effectiveness of the proposed solutions. The overall environment is already operational for two years, while user and administrators' feedback has been incorporated into the system in a regular manner. Evaluation of the work has been performed in the online wireless network environment by computer and communication engineers and it strongly indicates that the proposed mechanism is both effective and efficient. Finally, future steps and enhancements are discussed.

关键词： Intelligent networks Environmental management Wireless networks Resource management computer architecture Service oriented architecture Urban areas Monitoring Software testing Robustness

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MAX-MIN FAIR FLOW CONTROL SENSITIVE TO PRIORITIES

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Journal of Interconnection Networks 2005年第2期6卷 85-114页

作者： PANAGIOTA FATOUROU MARIOS MAVRONICOLAS PAUL SPIRAKIS Department of Computer Science University of Ioannina Ioannina GR-45110 Greece Department of Computer Science University of Cyprus Nicosia CY-1678 Cyprus Department of Computer Engineering and Informatics University of Patras Patras GR-26500 Greece Research and Academic Computer Technology Institute Patras GR-26110 Greece

Flow control is the dominant technique currently used in communication networks for preventing excess traffic from flooding the network, and for handling congestion. In rate-based flow control, transmission rates of sessions are adjusted in an end-to-end manner through a sequence of operations . In this work, we present a theory of max-min fair , rate-based flow control sensitive to priorities of different sessions, as a significant extension of the classical theory of max-min fair, rate-based flow control to networks supporting applications with diverse requirements on network resources. Each individual session bears a priority function , which maps the session's priority to a transmission rate; the priority is a working abstraction of the session's priority to bandwidth access. Priority functions enable the specification of requirements on bandwidth access by distributed applications, and the formal handling of such requirements. We present priority max-min fairness , as a novel and well motivated fairness condition which requires that assigned rates correspond, through the priority functions, to priorities comprising a max-min vector. We also introduce priority bottleneck algorithms gradually update a session's rate until when its priority is restricted on a priority bottleneck edge of the network. We establish a collection of interesting combinatorial properties of priority bottleneck algorithms. Most significantly, we show that they can only converge to priority max-min fairness. As an application of our general theory, we embed priority bottleneck algorithms in the more realistic optimistic framework for rate-based flow control. The optimistic framework allows for both decreases and increases of session rates. We exploit these additionally provided semantics to prove further combinatorial properties for the termination of priority bottleneck algorithms in the optimistic framework. We use these properties to conclude the first optimistic algorithms for efficien

关键词： Flow control Max-min fairness Priority max-min fairness Priority bottleneck algorithms Convergence complexity

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Workflow - coordinated integration of enterprise/ industrial systems based on a semantic service - oriented architecture

Workflow - coordinated integration of enterprise/ industrial...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： C. Alexakos A.P. Kalogeras S. Likothanassis J. Gialelis S. Koubias Pattern Recognition Laboratory Department of Computer Engineering and Informatics University of Patras Rio Greece Industrial Systems Institute Science Park Platani Greece Pattern Recognition Laboratory Department of Computer Engineering and Informatics Engineering and Informatics University of Patras Rio Greece Research Academic Computer Technology Institute Patras Greece Applied Electronics Laboratory Department of Electrical and Computer Engineering University of Patras Rio Greece

Enterprise integration is significant for the enforcement of novel business models in an enterprise/industry. The great heterogeneity of systems/applications in the enterprise environment requires the introduction of interoperability aspects in order to resolve integration problems in a flexible and dynamic way. Our approach introduces an advanced enterprise semantic model representing both enterprise structure and available services, through the use of ontologies. The model is associated by a specific architecture that uses the above model in combination with state-of-the-art technologies such as Web services and workflows

关键词： Application software Ontologies Web services Semantic Web computer architecture Service oriented architecture Logic Internet Electronics industry Industrial electronics

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Graphical object recognition using statistical language models

Graphical object recognition using statistical language mode...

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International Conference on Document Analysis and Recognition

作者： L. Keyes A. O'Sullivan A. Winstanley School of Informatics and Engineering Institute of Technology Blanchardstown Department of Computer Science NUI Maynooth Company Kildare Ireland

This paper describes a proposed system for the recognition and labeling of graphical objects within architectural and engineering documents that integrates statistical language models (SLMs) with traditional classifiers. SLMs are techniques used with success in natural language processing (NLP) for use in such tasks as speech recognition and information retrieval. This research proposes the adaptation of SLMs for use with graphical notation i.e. statistical graphical language model (SGLMs). Reasoning of the similarities between natural language and technical graphics is presented and the proposed use of SGLM for graphical object recognition is described.

关键词： Object recognition Graphics Natural languages Information systems Natural language processing Pattern recognition Text analysis Shape measurement Speech recognition Information retrieval

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Providing support for integrated scientific computing: metacomputing meets the grid and the semantic Web 05

Providing support for integrated scientific computing: metac...

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IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGRID)

作者： S. Lalis C. Houstis M. Pitikakis G. Vasilakis M. Vavalis Department of Computer and Communications Engineering University of Thessally Greece Informatics and Telematics Institute Center for Research and Technology Greece

ISBN: (纸本)9780780390744

In this paper, we present an integrated system architecture for metacomputing on top of distributed scientific resources via semantic-driven information management. Our approach is to consider both data and programs as objects of an application-specific ontology, describing them via corresponding metadata schemata that can be exploited to search for and to generate information in an efficient and automated way. Metacomputations are expressed in the form of workflows thereby enabling a flexible combination of data and program objects that can reside on different servers or grid resources. Workflow descriptions are associated with ontology concepts and can be activated as a side-effect of searching for information to produce new data on demand. We also report on the current status of an implementation that provides support for several aspects of this architecture.

关键词： Scientific computing Metacomputing Semantic Web computer architecture Grid computing Resource management Distributed computing Service oriented architecture Information management Ontologies

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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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