Search (77 results, page 4 of 4)

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Abstract

Repositories are web portals that provide access to learning objects. Resources can be easily located through the use of metadata, an important factor to increase the ease of searching for digital resources in repositories. However, there are as yet no similarly effective methods in order to increase access to learning objects. The main goal of this paper is to offer an alternative search system to improve access to academic learning objects and publications for several repositories through the use of information visualisation and Simple Knowledge Organization Schemes (SKOS). To this end, we have developed a visual framework and have used the Organic.Edunet and AGRIS as case studies in order to access academic and scientific publication resources respectively. In this paper, we present the results of our work through a test aimed at evaluating the whole visual framework, and offer recommendations on how to integrate this type of visual search into academic repositories based on SKOS.

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Abstract

This paper illustrates an initial step towards the 'semantic enrichment' of University of Vienna's Phaidra repository as one of the valuable and up-to-date strategies able to enhance its role and usage. Firstly, a technical report points out the choice made in a local context, i.e. the deployment of the vocabulary server iQvoc instead of the formerly used SKOSMOS, explaining design decisions behind the current tool and additional features that the implementation required. Afterwards, some modelling characteristics of the local LOD controlled vocabulary are described according to SKOS documentation and best practices, highlighting which approaches can be pursued for rendering a LOD KOS available in the Web as well as issues that can be possibly encountered.

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Source

Wissensspeicher in digitalen Räumen: Nachhaltigkeit - Verfügbarkeit - semantische Interoperabilität. Proceedings der 11. Tagung der Deutschen Sektion der Internationalen Gesellschaft für Wissensorganisation, Konstanz, 20. bis 22. Februar 2008. Hrsg.: J. Sieglerschmidt u. H.P.Ohly

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Date

22. 2.2013 11:34:18

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Abstract

Purpose - The paper aims to develop a prototype middleware framework between different terminology resources in order to provide a subject cross-browsing service for library portal systems. Design/methodology/approach - Nine terminology experts were interviewed to collect appropriate knowledge to support the development of a theoretical framework for the research. Based on this, a simplified software-based prototype system was constructed incorporating the knowledge acquired. The prototype involved mappings between the computer science schedule of the Dewey Decimal Classification (which acted as a spine) and two controlled vocabularies, UKAT and ACM Computing Classification. Subsequently, six further experts in the field were invited to evaluate the prototype system and provide feedback to improve the framework. Findings - The major findings showed that, given the large variety of terminology resources distributed throughout the web, the proposed middleware service is essential to integrate technically and semantically the different terminology resources in order to facilitate subject cross-browsing. A set of recommendations are also made, outlining the important approaches and features that support such a cross-browsing middleware service. Originality/value - Cross-browsing features are lacking in current library portal meta-search systems. Users are therefore deprived of this valuable retrieval provision. This research investigated the case for such a system and developed a prototype to fill this gap.

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Abstract

Ontologies are increasingly seen as a new type of knowledge organization system (KOS) besides traditional ones such as classification schemes or thesauri. Consequently, there are efforts to compare them with and map them to other KOS. This paper argues that only ontologies for reality representation are useful subjects of such comparisons and mappings. These ontologies are difficult to distinguish from other "data modelling" - types of ontology, since both can be represented through the popular Web Ontology Language (OWL). Data modelling ontologies such as Simple Knowledge Organization Systems (SKOS) are useful instruments for establishing interoperability between KOS in the sense of publishing and accessing data and data models in a uniform way as well as for relating them to each other. Discriminating these two understandings of ontologies particularly supports comparisons and mappings between traditional KOS and ontologies. In practice, such efforts are still impeded by the absence of standards or guidelines for vocabulary control in ontologies. Moreover, this paper emphasizes that methods for constructing and evaluating reality representation ontologies can be useful to re-engineer traditional KOS. This makes them become more interoperable in the sense of combinable, but also more useful in the sense of improving search expansion results and reusable for different purposes.

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Abstract

This paper explores the history, uses cases, and future plans associated with availability of the Dewey Decimal Classification (DDC) system as linked data. Parts of the Dewey Decimal Classification (DDC) system have been available as linked data since 2009. Initial efforts included the DDC Summaries (the top three levels of the DDC) in eleven languages exposed as linked data in dewey.info. In 2010, the content of dewey.info was further extended by the addition of assignable numbers and captions from the Abridged Edition 14 data files in English, Italian, and Vietnamese. During 2012, we will add assignable numbers and captions from the latest full edition database, DDC 23. In addition to the "old friends" of different Dewey language versions, institutions such as the British Library and Deutsche Nationalbibliothek have made use of Dewey linked data in bibliographic records and authority files, and AGROVOC has linked to our data at a general level. We expect to extend our linked data network shortly to "new acquaintances" such as GeoNames, ISO 639-3 language codes, and Mathematics Subject Classification. In particular, we will examine the linking process to GeoNames as an example of cross-domain vocabulary alignment. In addition to linking plans, we report on use cases that facilitate machine-assisted categorization and support discovery in the Semantic Web environment.

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Abstract

This paper describes recent work on registering Resource Description Framework (RDF) versions of the entities and relationships from the Functional Requirements for Bibliographic Records (FRBR) and Functional Requirements for Authority Data (FRAD) models developed by the International Federation of Library Associations and Institutions (IFLA). FRBR was developed several years before FRAD, and is under-developed in areas which FRAD was expected to cover; FRAD therefore makes significance reference to FRBR. Similarly, FRAD leaves a full treatment of subject authority data to the ongoing development of Functional Requirements for Subject Authority Data (FRSAD) which was finalised during 2010. Although the FRBR Review Group is charged with consolidating all three models in due course, the RDF versions of FRBR, FRAD, and FRSAD are being created in separate namespaces, with a separate Web Ontology Language (OWL) ontology to connect the three models. The paper discusses interoperability issues arising from this work. Such issues include class definitions and sub-classes, reciprocal properties, and disjoint classes and properties. The paper discusses similar work on the International Standard Bibliographic Description (ISBD), also maintained by IFLA, and related issues arising from the RDF representation of the metadata element set of RDA: resource description and access, which is based on the FRBR and FRAD models. The work is ongoing, and the paper updates the original conference presentation to the end of October 2010.

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Abstract

Crosswalks between different vocabularies are an indispensable prerequisite for integrated, high-quality search scenarios in distributed data environments where more than one controlled vocabulary is in use. Offered through the web and linked with each other they act as a central link so that users can move back and forth between different online data sources. In the past, crosswalks between different thesauri have usually been developed manually. In the long run the intellectual updating of such crosswalks is expensive. An obvious solution would be to apply automatic matching procedures, such as the so-called ontology matching tools. On the basis of computer-generated correspondences between the Thesaurus for the Social Sciences (TSS) and the Thesaurus for Economics (STW), our contribution explores the trade-off between IT-assisted tools and procedures on the one hand and external quality evaluation by domain experts on the other hand. This paper presents techniques for semi-automatic development and maintenance of vocabulary crosswalks. The performance of multiple matching tools was first evaluated against a reference set of correct mappings, then the tools were used to generate new mappings. It was concluded that the ontology matching tools can be used effectively to speed up the work of domain experts. By optimizing the workflow, the method promises to facilitate sustained updating of high-quality vocabulary crosswalks.

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Theme

Semantic Web

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Abstract

In economics there exists an internationally established classification system. Research literature is usually classified according to the JEL classification codes, a classification system originated by the Journal of Economic Literature and published by the American Economic Association (AEA). Complementarily to keywords which are usually assigned freely, economists widely use the JEL codes when classifying their publications. In cooperation with KU Leuven, ZBW - Leibniz Information Centre for Economics has published an unofficial multilingual version of JEL in SKOS format. In addition to this, exists the STW Thesaurus for Economics a bilingual domain-specific controlled vocabulary maintained by the German National Library of Economics (ZBW). Developed in the mid-1990s and since then constantly updated according to the current terminology usage in the latest international research literature in economics it covers all sub-fields both in the economics as well as in business economics and business practice containing subject headings which are clearly delimited from each other. It has been published on the web as Linked Open Data in the year 2009.

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Abstract

The Brazilian Government has made a massive volume of structured, semi-structured and non-structured public data available on the web to ensure that the administration is as transparent as possible. Subsequently, providing applications with enough capability to handle this "big data environment" so that vital and decisive information is readily accessible, has become a tremendous challenge. In this environment, data processing is done via new approaches in the area of information and computer science, involving technologies and processes for collecting, representing, storing and disseminating information. Along these lines, this paper presents a conceptual model, the technical architecture and the prototype implementation of a tool, denominated DBgoldbr, designed to classify government public information with the help of ontologies, by transforming open data into open linked data. To achieve this objective, we used "soft system methodology" to identify problems, to collect users needs and to design solutions according to the objectives of specific groups. The DBgoldbr tool was designed to facilitate the search for open data made available by many Brazilian government institutions, so that this data can be reused to support the evaluation and monitoring of social programs, in order to support the design and management of public policies.

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Abstract

Social tagging, hashtags, and geotags are used across a variety of platforms (Twitter, Facebook, Tumblr, WordPress, Instagram) in different countries and cultures. This book, representing researchers and practitioners across different information professions, explores how social tags can link content across a variety of environments. Most studies of social tagging have tended to focus on applications like library catalogs, blogs, and social bookmarking sites. This book, in setting out a theoretical background and the use of a series of case studies, explores the role of hashtags as a form of linked data?without the complex implementation of RDF and other Semantic Web technologies.

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Abstract

This highly practical handbook teaches you how to unlock the value of your existing metadata through cleaning, reconciliation, enrichment and linking and how to streamline the process of new metadata creation. Libraries, archives and museums are facing up to the challenge of providing access to fast growing collections whilst managing cuts to budgets. Key to this is the creation, linking and publishing of good quality metadata as Linked Data that will allow their collections to be discovered, accessed and disseminated in a sustainable manner. This highly practical handbook teaches you how to unlock the value of your existing metadata through cleaning, reconciliation, enrichment and linking and how to streamline the process of new metadata creation. Metadata experts Seth van Hooland and Ruben Verborgh introduce the key concepts of metadata standards and Linked Data and how they can be practically applied to existing metadata, giving readers the tools and understanding to achieve maximum results with limited resources. Readers will learn how to critically assess and use (semi-)automated methods of managing metadata through hands-on exercises within the book and on the accompanying website. Each chapter is built around a case study from institutions around the world, demonstrating how freely available tools are being successfully used in different metadata contexts. This handbook delivers the necessary conceptual and practical understanding to empower practitioners to make the right decisions when making their organisations resources accessible on the Web. Key topics include, the value of metadata; metadata creation - architecture, data models and standards; metadata cleaning; metadata reconciliation; metadata enrichment through Linked Data and named-entity recognition; importing and exporting metadata; ensuring a sustainable publishing model. This will be an invaluable guide for metadata practitioners and researchers within all cultural heritage contexts, from library cataloguers and archivists to museum curatorial staff. It will also be of interest to students and academics within information science and digital humanities fields. IT managers with responsibility for information systems, as well as strategy heads and budget holders, at cultural heritage organisations, will find this a valuable decision-making aid.

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Content

"Am 19. und 20. Juli 2010 fand in der Fachhochschule Köln die internationale Tagung "Concepts in Context - Cologne Conference on Interoperability and Semantics in Knowledge Organization" statt. Ausgerichtet wurde sie mit finanzieller Unterstützung der Deutschen Forschungsgemeinschaft (DFG) vom Institut für Informationsmanagement (IIM) der Fachhochschule Köln in Kooperation mit der Deutschen Nationalbibliothek (DNB). Im Mittelpunkt der Veranstaltung standen Fragen der Modellierung von Interoperabilität und semantischen Informationen in der Wissensorganisation, die einen unmittelbaren thematischen Zusammenhang mit den am Institut für Informationsmanagement angesiedelten Projekten CrissCross und RESEDA aufweisen. Das Programm umfasste 11 Beiträge aus 5 verschiedenen Ländern sowohl zu praktischen als auch zu theoretischen Aspekten der Wissensorganisation unter besonderer Berücksichtigung moderner Technologien, aktueller Entwicklungen und zukunftsbezogener Perspektiven. Der erste Tag war als Abschlussworkshop für das CrissCross-Projekt konzipiert und bot in zwei Sessions neben einem umfassenden Überblick über das Projekt auch weitere Best-Practice-Beispiele für die Gestaltung von Interoperabilität vor allem im Rahmen von Ansätzen der Semantic-Web- und Linked-Data-Initiativen. Eine vertiefte Auseinandersetzung mit sich in der Entwicklung befindlichen oder auch erst kürzlich fertiggestellten Standards und Modellen der Interoperabilität und Wissensorganisation erfolgte am zweiten Tag, der mit einer Keynote von Dagobert Soergel von der University at Buffalo (USA) eröffnet wurde und in zwei weitere Sessions unterteilt war. Zu der Veranstaltung konnten Prof. Dr. Klaus-Dirk Schmitz, Leiter des Kölner Instituts für Informationsmanagement, sowie Ulrike Junger, Leiterin der Abteilung Sacherschließung der Deutschen Nationalbibliothek in Stellvertretung der Generaldirektorin, Dr. Elisabeth Niggemann, ca. 120 Teilnehmer aus insgesamt 16 Ländern begrüßen. Prof. Klaus-Dirk Schmitz stellte in seiner Eröffnungsrede die Fachhochschule Köln und insbesondere das Institut für Informationsmanagement vor und erörterte das Konferenzthema mit Beispielen aus Forschungsgebieten der Terminologiearbeit. Ulrike Junger ging auf die gelungene Zusammenarbeit zwischen der Fachhochschule Köln und der Deutschen Nationalbibliothek ein, die mit dem DFG-Projekt DDC Deutsch begonnen und in dem DFG-Projekt CrissCross eine Fortsetzung gefunden hatte. Eine Einführung in die spezifischen Konferenzinhalte gab schließlich Prof. Winfried Gödert, Leiter des RESEDA-Projekts sowie - seitens der Fachhochschule Köln - des CrissCross-Projekts.
Die erste Session der Veranstaltung war dem von der DFG geförderten Projekt CrissCross gewidmet, das von der Fachhochschule Köln in Kooperation mit der Deutschen Nationalbibliothek durchgeführt wird. Das Projekt, das 2006 begann und im Herbst diesen Jahres endet, verfolgt das Ziel, ein multilinguales, thesaurusbasiertes und nutzerfreundliches Recherchevokabular zu heterogen erschlossenen Informationsressourcen zu schaffen. Hierzu wird einerseits eine unidirektionale Verbindung zwischen Sachschlagwörtern der Schlagwortnormdatei (SWD) und Notationen der Dewey-Dezimalklassifikation hergestellt, andererseits werden - in Fortführung der in dem Projekt Multilingual Access to Subject Headings (MACS) entwickelten Methodik - häufig verwendete SWD-Schlagwörter mit ihren Äquivalenten in der englischen Schlagwortsprache Library of Congress Subject Headings (LCSH) und der französischen Schlagwortsprache Répertoire d'autorité-matière encyclopédique et alphabétique unifié (RAMEAU) verknüpft. Jan-Helge Jacobs, Katrin Müller und Tina Mengel von der Fachhochschule Köln gaben einen Überblick über das für das Projekt spezifische SWD-DDC-Mapping. Sie erläuterten die zugrunde liegende Methodik und stellten den mit den Daten gegebenen möglichen Mehrwert sowohl zur Verbesserung des Zugangs zur DDC und zu DDC-erschlossenen Informationsressourcen im Allgemeinen als auch zur Unterstützung von explorativen Suchprozessen im Speziellen dar. Ergänzend präsentierten Yvonne Jahns und Helga Karg von der Deutschen Nationalbibliothek den im MACSProjekt praktizierten Ansatz zur Verbindung von Indexierungsinstrumenten verschiedener Sprachen und das damit gegebene Potential zur Unterstützung eines multilingualen Retrievals. Die adäquate Modellierung von Dokumentationssprachen und Relationen zur Gewährleistung von Interoperabilität und Verbesserung von Suchfunktionalitäten bei heterogen erschlossenen Dokumentbeständen besonders in Hinblick auf Semantic-Web-Applikationen war Thema der zweiten Session. Jessica Hubrich von der Fachhochschule Köln nahm theoretische Ergebnisse des CrissCross-Projektes auf und stellte ein gestuftes Interoperabilitätsmodell vor, in dem Methoden zur Erstellung von Links zwischen Begriffen verschiedener Wissenssysteme in Bezug gesetzt wurden zu spezifischen Suchfunktionalitäten in Retrievalszenarien. Im anschließenden Vortrag von Claudia Effenberger und Julia Hauser von der Deutschen Nationalbibliothek wurde von den bisherigen Ergebnissen eines an der Deutschen Nationalbibliothek angesiedelten Forschungsprojekts berichtet, in dem jeder Klasse der Dewey-Dezimalklassifikation ein eindeutiger Identifier zugeordnet wird, durch den verschiedene Versionen einer Klasse unterschieden werden können. Dies dient der Verbesserung des Zugriffs auf bibliografische Titeldaten, die auf der Basis unterschiedlicher DDC-Versionen erschlossen wurden. Der erste Tag schloss mit einer Präsentation von Antoine Isaac von der Vrije Universiteit in Amsterdam ab. In dieser wurde Interoperabilität als Teil eines semantischen Netzes von Linked Data diskutiert und ein Überblick über zentrale Linked-Data-Projekte gegeben.

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