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SID Structural Integrity and Durability 2007年第3期3卷 177-189页

作者： Beyer, S. Zhang, Ch. Hirose, S. Sladek, J. Sladek, V. Department of Civil Engineering University of Applied SciencesZittau/Görlitz D-02763 Zittau Germany Department of Structural Mechanics Department of Civil Engineering University of Siegen D-57068 Siegen Germany Department of Mechanical and Environmental Informatics Tokyo Institute of Technology Tokyo 152-8552 Japan Institute of Construction and Architecture Slovak Academy of Sciences 84503 Bratislava Slovakia

This paper presents a hypersingular time-domain boundary element method (BEM) for transient dynamic crack analysis in two-dimensional (2-D), homogeneous, anisotropic and linear elastic solids. A finite crack in an infinite or a finite solid subjected to impact loading conditions is investigated. A combination of the classical displacement boundary integral equations (BIEs) on the external boundary and the hypersingular traction BIEs on the crack-faces is applied. The present BEM uses the time-domain dynamic fundamental solutions for anisotropic solids derived by Wang and Achenbach (1994). An explicit time-stepping scheme based on collocation method is developed. Numerical examples for computing the dynamic stress intensity factors (SIFs) are presented and discussed. Copyright © 2007 Tech Science Press.

关键词： Boundary element method

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On A Web-Graph-Based Micronetwork Architecture for SoCs

On A Web-Graph-Based Micronetwork Architecture for SoCs

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50th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS'07), vol.3

作者： Ling Wang Shouye Piao Yingtao Jiang Juyeon Jo Lihong Zhang Department of Computer Science Harbin Institute of Technology Harbin Heilongjiang China Department of Electrical and Computer Engineering University of Nevada Las Vegas NV USA School of Informatics University of Nevada Las Vegas NV USA Engineering and Applied Science Memorial University of Newfoundland Saint John's NEW Canada

From System-on-chip to Network-on-chip, the main dissimilarity is replacing the bus with the network. How connect, how formative network function is related to topology structure. In this paper we propose a topology structure for NoC, and compare it with mesh, torus, the fat tree, octagon, spidergon topology networks by five kinds of mainly properties: node degree, network diameter, connectivity, the average most short-circuit path and the average shortest wire length. Experiment results show that this topology has better performance on cost/performance layout.

关键词： Network-on-a-chip Network topology Integrated circuit interconnections System-on-a-chip Delay effects Wiring Power system interconnection Protocols computer architecture computer science

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A method for personalized clustering in data intensive web applications

A method for personalized clustering in data intensive web a...

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Joint International Workshop on Adaptivity, Personalization and the Semantic Web, APS'06

作者： Rigou, Maria Sirmakessis, Spiros Tzimas, Giannis Computer Engineering and Informatics Department University of Patras Rio GR-26504 Department of Applied Informatics in Administration and Economy TEI of Messolonghi Nea Ktiria Messolonghi GR-30200 Research Academic Computer Technology Institute Patras University N. Kazantzaki Str. Rio GR-26500

ISBN: (纸本)1595934537

The paper introduces an algorithm for personalized clustering based on a range tree structure, used for identifying all web documents satisfying a set of predefined personal user preferences. The returned documents go through a clustering phase before reaching the end user, thus allowing more effective manipulation and supporting the decision making process. The proposed algorithm demonstrates increased applicability in semantic web settings, since they offer the infrastructure for the explicit declaration of web document attributes and their respective values, thus allowing for more automated retrieval. The proposed algorithm improves the k-means range algorithm, as it uses the already constructed range tree (i.e. during the personalized filtering phase) as the basic structure on which the clustering step is based, applying instead of the k-means, the k-windows algorithm. The total number of parameters used for modeling the web documents dictates the number of dimensions of the Euclidean space representation. The time complexity of the algorithm is O(log d-2n+v), where d is the number of dimensions, n is the total number of web documents and v is the size of the answer. Copyright 2006 ACM.

关键词： Cluster analysis

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A tool for extracting model clones from a conceptual schema

A tool for extracting model clones from a conceptual schema

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IASTED International Conference on Software engineering, as part of the 24th IASTED International Multi-Conference on applied informatics

作者： Faliagka, Evanthia Rigou, Maria Sirmakessis, Spiros Tzimas, Giannis Department of Computer Engineering and Informatics University of Patras Rio Campus 26504 Greece Research Academic Computer Technology Institute Patras University N. Kazantzaki str. Rio Campus 26500 Greece Department of Applied Informatics in Administration and Economy Technological Institution of Messolongi Nea Ktiria 30200 Greece

ISBN: (纸本)0889865744

In this paper the authors present an overview of techniques and tools that enable the effective evaluation and refactoring of a Web application's conceptual schema. Moreover, based on the introduction of the notion of model clones (in a previous work), as partial conceptual schemas that are repeated within a broader application model and the notion of model smells, as certain blocks in the Web applications model that imply the possibility of refactoring, this paper illustrates a methodology and a tool for detecting and evaluating the existence of potential model clones, in order to identify problems in an application's conceptual schema by means of efficiency, consistency, usability and overall quality. The methodology can be deployed either in the process of designing an application or in the process of reengineering it. Evaluation is performed according to a number of inspection steps. At first level the compositions used in the hypertext design are evaluated, followed by a second level evaluation concerning data manipulation and presentation to the user.

关键词： World Wide Web

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Using Semantic Web Mining technologies for personalized e-Learning experiences

Using Semantic Web Mining technologies for personalized e-Le...

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4th IASTED International Conference on Web-Based Education, WBE 2005

作者： Markellou, Penelope Mousourouli, Ioanna Spiros, Sirmakessis Tsakalidis, Athanasios Research Academic Computer Technology Institute 61 Riga Feraiou str. 26221 Patras Greece University of Patras Computer Engineering and Informatics Department 26504 Patras Greece Technological Education Institute of Messolongi Department of Applied Informatics in Administration and Economics 30200 Messolongi Greece

ISBN: (纸本)0889864802

The challenge of the Semantic Web Mining technologies in the e-Learning domain can relate to the provision of personalized experiences for the users. Particularly, these applications can take into consideration the individual needs and requirements of learners. In this paper, we propose a framework for personalised e-Learning based on aggregate usage profiles and a domain ontology. We have distinguished two stages in the whole process, one of offline tasks that includes data preparation, ontology creation and usage mining and one of online tasks that concerns the production of recommendations.

关键词： Ontology

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Owl: Next generation system monitoring

Owl: Next generation system monitoring

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2005 Computing Frontiers Conference

作者： Schulz, Martin Lee, Hsien-Hsin S. White, Brian S. McKee, Sally A. Jeitner, Jürgen Center for Applied Scientific Computing Lawrence Livermore National Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Computer Systems Lab. Cornell University Department of Informatics Technische Universität München

ISBN: (纸本)1595930183

As microarchitectural and system complexity grows, comprehending system behavior becomes increasingly difficult, and often requires obtaining and sifting through voluminous event traces or coordinating results from multiple, non-localized sources. Owl is a proposed framework that overcomes limitations faced by traditional performance counters and monitoring facilities in dealing with such complexity by pervasively deploying programmable monitoring elements throughout a system. The design exploits reconfigurable or programmable logic to realize hardware monitors located at event sources, such as memory buses. These monitors run and writeback results autonomously with respect to the CPU, mitigating the system impact of interrupt-driven monitoring or the need to communicate irrelevant events to higher levels of the system. The monitors are designed to snoop any kind of system transaction, e.g., within the core, on a bus, across the wire, or within I/O devices. Copyright 2005 ACM.

关键词： Monitoring

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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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New E-learning tools for DC-DC converters

New E-learning tools for DC-DC converters

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2005 European Conference on Power Electronics and Applications

作者： Hamar, J. Funato, H. Ogasawara, S. Nagy, I. Ogasawara and Funato Laboratory Dept. of Electrical and Electronic Engineering Utsunomiya University 7-1-2 Yoto Utsunomiya-shi Tochigi 321-8585 Japan Budapest University of Technology and Economics Department of Automation and Applied Informatics Goldmann György tér 3 H-1111 Budapest Hungary Computer and Automation Institute Hungarian Academy of Sciences Hungary

ISBN: (纸本)9075815085

The paper gives an overview of the Yoto project, a novel e-learning initiative to build up an electrical engineering knowledge base. It also presents a new e-module of the project relating to the steady-state operation of dc-dc converters. The multimedia rich module contains numerous interactive tools promoting the high level education in the academy sector and the vocational trainings in the industry. The interactive tools also highly support the circuit design process by enabling fast calculation and access to relevant circuit quantities and waveforms (voltages and currents) in steady-state without long simulations.

关键词： DC-DC converters

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Providing service standardisation for virtual enterprises

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1545-1552页

作者： Vassiliadis, B. Tsaknakis, J. Drossos, L. Sirmakessis, S. Ioannou, K. Internet and Multimedia Technologies Academic Research Computer Technology Institute Patras Greece Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

Virtual Enterprises are a, relatively, new business model that is greatly depended on network technology. Providing services in such an environment is a challenge in itself;architectural, technological and organisational difficulties have not permitted yet the development of a framework for Virtual Enterprise enaction. In this paper we describe a Virtual Private Network architecture that uses special monitor and coordination processes in order to achieve efficient delivery of services and activities in Virtual Enterprise environments. We discuss the general architecture of the system, emphasising on the solutions used to monitor and co-ordinate various activities.

关键词： Virtual reality

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New e-learning tools for DC-DC converters

New e-learning tools for DC-DC converters

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European Conference on Power Electronics and Applications

作者： J. Hamar H. Funato S. Ogasawara I. Nagy Ogasawara & Funato Laboratory Department of Electrical and Electronic Engineering Utsunomiya University Utsunomiya Tochigi Japan Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Hungary

The paper gives an overview of the Yoto project, a novel e-learning initiative to build up an electrical engineering knowledge base. It also presents a new e-module of the project relating to the steady-state operation of DC-DC converters. The multimedia rich module contains numerous interactive tools promoting the high level education in the academy sector and the vocational trainings in the industry. The interactive tools also highly support the circuit design process by enabling fast calculation and access to relevant circuit quantities and waveforms (voltages and currents) in steady-state without long simulations

关键词： Electronic learning DC-DC power converters Humans Steady-state Laboratories informatics Automation Business computer science education Electrical engineering

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