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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2011年 6520卷 68-92页

作者： Neumayr, Bernd Schrefl, Michael Thalheim, Bernhard Department of Business Informatics - Data and Knowledge Engineering Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria Department of Computer Science and Applied Mathematics Christian Albrechts University Kiel Olshausenstr. 40 24098 Kiel Germany

ISBN: (纸本)9783642175046

Employing multi-level abstraction in modeling refers to representing objects at multiple levels of one or more abstraction hierarchies, mainly classification, aggregation and generalization. Multiple representation, however, leads to accidental complexity, complicating modeling and extension. Several modeling techniques, like powertypes, deep instantiation, materialization, m-objects, HERM, and the component model may be used to reduce unnecessary complexity with multilevel abstraction. This chapter compares these modeling techniques using four comparison criteria: (1) compactness (modular and redundancyfree models), (2) query flexibility (number and kind of pre-defined entrypoints for querying), (3) heterogeneous level-hierarchies, and (4) multiple relationship-abstractions (such as between relationship occurrence and relationship type). © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Abstracting

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Author Index Volume 7 (2011)

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Multiagent and Grid Systems 2011年第6期7卷 311-313页

作者： [ Systems Research Institute Polish Academy of Sciences Warsaw and University of Gdansk Warsaw Poland Systems Research Institute Polish Academy of Sciences Warsaw and Management Academy Warsaw Poland Software Engineering Department Faculty of Automatics Computers and Electronics University of Craiova Bvd.Decebal Craiova Romania University of Duisburg-Essen Institute for Computer Science and Business Information Systems (ICB) Practical Computer Science Data Management Systems and Knowledge Representation Essen Germany

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Incorporating data provenance in a medical CSCW system

Incorporating data provenance in a medical CSCW system

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21st International Conference on database and Expert Systems Applications, DEXA 2010

作者： Stark, Konrad Koncilia, Christian Schulte, Jonas Schikuta, Erich Eder, Johann University of Vienna Department of Knowledge and Business Engineering Austria University of Paderborn Heinz Nixdorf Institute Germany Alps Adria University Klagenfurt Department of Informatics Systems Austria

ISBN: (纸本)3642153631

Medical research is a highly collaborative process in an interdisciplinary environment that may be effectively supported by a Computer Supported Cooperative Work (CSCW) system. Research activities should be traceable in order to allow verification of results, repeatability of experiments and documentation as learning processes. Therefore, by recording the provenance of data together with the collaborative context it is embedded into, novel types of provenance queries may be answered. We designed and implemented a next-generation CSCW system providing both the collaborative functionalities as well as the definition and execution of structured processes. We integrated a data provenance model recording process- and collaboration-related operations automatically and demonstrate the capabilities of the model by answering specific data provenance queries from the biomedical domain. © 2010 Springer-Verlag.

关键词： Groupware

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Ubiquitous data

Ubiquitous data

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作者： Hotho, Andreas Pedersen, Rasmus Ulslev Wurst, Michael University Kassel Depart. of Electrical Engineering/Computer Science Knowledge and Data Engineering Group Germany Copenhagen Business School Dept. of Informatics Embedded Software Lab. Copenhagen Denmark Technical University Dortmund Computer Science LS8 44221 Dortmund Germany

ISBN: (纸本)3642163912

Ubiquitous knowledge discovery systems must be captured from many different perspectives. In earlier chapters, aspects like machine learning, underlying network technologies etc. were described. An essential component, which we shall discuss now, is still missing: Ubiquitous data. While data themselves are a central part of the knowledge discovery process, in a ubiquitous setting new challenges arise. In this context, the emergence of data itself plays a large role, therefore we label this part of KDubiq systems ubiquitous data. It clarifies the KDubiq challenges related to the multitude of available data and what we must do before we can tap into this rich information source. © 2010 Springer-Verlag.

关键词： Taps

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An analysis of current trends in CBR research using multiview clustering

An analysis of current trends in CBR research using multivie...

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作者： Greene, Derek Freyne, Jill Smyth, Barry Cunningham, Pádraig Clique Research Cluster School of Computer Science and Informatics University College Dublin Ireland CSIRO's ICT Centre Based Hobart Australia Computer Science School of Computer Science and Informatics University College Dublin Ireland ChangingWorlds Ltd. Ireland Clarity: The Centre for Sensor Web Technologies Ireland Department of Knowledge and Data Engineering School of Computer Science and Informatics University College Dublin Ireland

The European Conference on Case-Based Reasoning (CBR) in 2008 marked IS years of international and European CBR conferences where almost seven hundred research papers were published. In this report we review the research themes covered in these papers and identify the topics that are active at the moment. The main mechanism for this analysis is a clustering of the research papers based on both cocitation links and text similarity. It i.ç interesting to note that the core set of papers has attracted citations from almost three thousand papers outside the conference collection so it is clear that the CBR conferences are a subpart of a much larger whole. It is remarkable that the research themes revealed by this analysis do not map directly to the subtopics of CBR that might appear in a textbook. Instead they reflect the applications-oriented focus of CBR research, and cover the promising application areas and research challenges that are faced. Copyright © 2010, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Case based reasoning

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Multi-level domain modeling with m-objects and m-relationships

Multi-level domain modeling with m-objects and m-relationshi...

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6th Asia-Pacific Conference on Conceptual Modelling, APCCM 2009

作者： Neumayr, Bernd Grün, Katharina Schrefl, Michael Department of Business Informatics - Data and Knowledge Engineering Johannes Kepler University Linz Austria

ISBN: (纸本)9781920682774

Using traditional semantic data modeling, multi-level modeling can be achieved by representing objects in different abstraction hierarchies, namely classification, aggregation and generalization. This, however, leads to accidental complexity, complicating maintenance and extension. Several modeling techniques, like deep instantiation, powertypes and materialization, have been proposed to reduce unnecessary complexity in modeling objects at multiple levels. Multilevel objects (m-objects) and multi-level relationships (m-relationships) build on these results and provide a natural, intuitive representation of the concretization of objects and relationships along multiple levels of abstraction. By integrating aspects of the different abstraction hierarchies in a single concretization hierarchy, they improve readability and simplify maintenance and extension as compared to previous approaches. The discussion on conceptual modeling is complemented by a brief presentation of M-SQL, a data manipulation and query language for working with m-objects and m-relationships in an object-relational setting. Copyright © 2009, Australian Computer Society, Inc.

关键词： Query languages

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FedDW: A tool for querying federations of data warehouses: Architecture, use case and implementation

FedDW: A tool for querying federations of data warehouses: A...

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ICEIS 2009 - 11th International Conference on Enterprise Information Systems

作者： Berger, Stefan Schrefl, Michael Department of Business Informatics - Data and Knowledge Engineering University of Linz Altenberger Str. 69 Linz Austria

ISBN: (纸本)9789898111845

Recently, Federated data Warehouses - collections of autonomous and heterogeneous data Marts - have become increasingly attractive as they enable the exchange of business information across organization boundaries. The advantage of federated architectures is that users may access the global, mediated schema with OLAP applications, while the data Marts need not be changed and retain full autonomy. Although the underlying concepts are mature, tool support for Federated DWs has been poor so far. This paper presents the prototype of the "FedDW" Query Tool that supports distributed query processing in federations of ROLAP data Marts. It acts as middleware component that reformulates user queries according to semantic correspondences between the autonomous data Marts. We explain FedDW's architecture, demonstrate a use-case and explain our implementation. We regard our proof-of-concept prototype as a first step towards the development of industrial strength query tools for DW federations.

关键词： data warehouses

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Information systems for federated biobanks

Information systems for federated biobanks

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作者： Eder, Johann Dabringer, Claus Schicho, Michaela Stark, Konrad Alps Adria University Klagenfurt Department of Informatics Systems Austria University of Vienna Department of Knowledge and Business Engineering Austria

ISBN: (纸本)3642037216

Biobanks store and manage collections of biological material (tissue, blood, cell cultures, etc.) and manage the medical and biological data associated with this material. Biobanks are invaluable resources for medical research. The diversity, heterogeneity and volatility of the domain make information systems for biobanks a challenging application domain. Information systems for biobanks are foremost integration projects of heterogenous fast evolving sources. The European project BBMRI (Biobanking and Biomolecular Resources Research Infrastructure) has the mission to network European biobanks, to improve resources for biomedical research, an thus contribute to improve the prevention, diagnosis and treatment of diseases. We present the challenges for interconnecting European biobanks and harmonizing their data. We discuss some solutions for searching for biological resources, for managing provenance and guaranteeing anonymity of donors. Furthermore, we show how to support the exploitation of such a resource in medical studies with specialized CSCW tools. © 2009 Springer.

关键词： Cell culture

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Enhanced security management for flexible and dynamic cooperative environments

Enhanced security management for flexible and dynamic cooper...

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2009 5th International Conference on Collaborative Computing: Networking, Applications and Worksharing, CollaborateCom 2009

作者： Schulte, Jonas Döpke, Ingo Kei, Reinhard Stark, Konrad Eder, Johann University of Paderborn Heinz-Nixdorf-Institute 33102 Paderborn Germany University of Vienna Department of Knowledge and Business Engineering 1010 Vienna Austria University of Klagenfurt Department of Informatics Systems 9020 Klagenfurt Austria

ISBN: (纸本)9789639799769

This paper deals with the challenge to create an authorization and authentication infrastructure for virtual knowledge spaces. Virtual knowledge spaces are a concept to build up flexible and adjustable environments for cooperative work and learning processes. When developing authorization concepts for virtual knowledge spaces, different boundary conditions have to be considered. Basically, we identify the specific requirements for the creation of coherent and intuitive rules to reduce the administrative complexity to a minimum and prevent mistakes. Furthermore we turn attention to flexibility of the authorization infrastructure as well as performance issues. The rights management described in this paper ought to fulfill these requirements.

关键词： Authentication

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Semantic annotation of epc models in engineering domains to facilitate an automated identification of common modelling practices

Lecture Notes in Business Information Processing

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Lecture Notes in business Information Processing 2009年 19卷 155-171页

作者： Bögl, Andreas Schrefl, Michael Pomberger, Gustav Weber, Norbert Department of Business Informatics - Data and Knowledge Engineering Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria Department of Business Informatics - Software Engineering Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria Siemens AG Corporate Technology-SE 3 Otto-Hahn-Ring 6 Munich Germany

ISBN: (纸本)9783642006692

An automated identification of common modeling practices from EPC (Event-Driven Process Chain) models requires to perform a semantic analysis of EPC functions and events. The semantic analysis faces the problem that an essential part of the EPC semantics is bound to natural language expressions in functions and events with undefined process semantics. The semantic annotation of natural language expressions provides an adequate approach to tackle this problem. This paper introduces a novel approach that enables an automated semantic annotation of EPC functions and events. It employs semantic patterns to analyze the textual structure of natural language expressions and to relate them to instances of a reference ontology. Thus, semantically annotated EPC model elements are input for subsequent semantic analysis that identifies common modeling practices. © 2009 Springer Berlin Heidelberg.

关键词： Ontology

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