-
Priss, U.: Faceted knowledge representation (1999)
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- Abstract
- Faceted Knowledge Representation provides a formalism for implementing knowledge systems. The basic notions of faceted knowledge representation are "unit", "relation", "facet" and "interpretation". Units are atomic elements and can be abstract elements or refer to external objects in an application. Relations are sequences or matrices of 0 and 1's (binary matrices). Facets are relational structures that combine units and relations. Each facet represents an aspect or viewpoint of a knowledge system. Interpretations are mappings that can be used to translate between different representations. This paper introduces the basic notions of faceted knowledge representation. The formalism is applied here to an abstract modeling of a faceted thesaurus as used in information retrieval.
- Date
- 22. 1.2016 17:30:31
-
Tudhope, D.; Hodge, G.: Terminology registries (2007)
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- Date
- 26.12.2011 13:22:07
- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Tzitzikas, Y.; Spyratos, N.; Constantopoulos, P.; Analyti, A.: Extended faceted ontologies (2002)
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- Abstract
- A faceted ontology consists of a set of facets, where each facet consists of a predefined set of terms structured by a subsumption relation. We propose two extensions of faceted ontologies, which allow inferring conjunctions of terms that are valid in the underlying domain. We give a model-theoretic interpretation to these extended faceted ontologies and we provide mechanisms for inferring the valid conjunctions of terms. This inference service can be exploited for preventing errors during the indexing process and for deriving navigation trees that are suitable for browsing. The proposed scheme has several advantages by comparison to the hierarchical classification schemes that are currently used, namely: conceptual clarity: it is easier to understand, compactness: it takes less space, and scalability: the update operations can be formulated easier and be performed more efficiently.
-
Will, L.D.: UML model : as given in British Standard Draft for Development DD8723-5:2008 (2008)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Dextre Clarke, S.G.; Will, L.D.; Cochard, N.: ¬The BS8723 thesaurus data model and exchange format, and its relationship to SKOS (2008)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Assem, M. van; Rijgersberg, H.; Wigham, M.; Top, J.: Converting and annotating quantitative data tables (2010)
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- Abstract
- Companies, governmental agencies and scientists produce a large amount of quantitative (research) data, consisting of measurements ranging from e.g. the surface temperatures of an ocean to the viscosity of a sample of mayonnaise. Such measurements are stored in tables in e.g. spreadsheet files and research reports. To integrate and reuse such data, it is necessary to have a semantic description of the data. However, the notation used is often ambiguous, making automatic interpretation and conversion to RDF or other suitable format diffiult. For example, the table header cell "f(Hz)" refers to frequency measured in Hertz, but the symbol "f" can also refer to the unit farad or the quantities force or luminous flux. Current annotation tools for this task either work on less ambiguous data or perform a more limited task. We introduce new disambiguation strategies based on an ontology, which allows to improve performance on "sloppy" datasets not yet targeted by existing systems.
-
Andelfinger, U.; Wyssusek, B.; Kremberg, B.; Totzke, R.: Ontologies in knowledge management : panacea or mirage?
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- Content
- Zusätzlich zu diesen Überlegungen treten sprachphilosophische Grundsatzüberlegungen: Jeder semantische Definitionsversuch einer technischen Ontologie muss durch Verwendung von Metasprachen erfolgen - letztlich kommt man hier wahrscheinlich nicht ohne die Verwendung natürlicher Sprache aus. Sehr schnell wird man also in einen unendlichen Regress verwiesen, wenn man versucht, technische Ontologien 'vollständig' durch weitere technische Ontologien zu beschreiben. Im Fortgang der Argumentation wird dann aufgezeigt, dass eine wesentliche Herausforderung bei technischen Ontologien also darin liegt, angesichts der Vielschichtigkeit menschlichen Wissens die Möglichkeiten (aber auch notwendigen Begrenzungen) symbolvermittelter Wissensrepräsentationen zu verbinden mit Formen der situativen und intersubjektiven Interpretation dieser symbolhaften Repräsentationen in sozialen Prozessen und in natürlicher Sprache. Nur so kann man auch dem Problem des skizzierten 'infiniten Regresses' begegnen, wonach die Bedeutung einer (technischen) Ontologie nie vollständig wieder selbst durch (technische) Ontologien beschrieben werden kann.
In diesem Sinne könnte auch Wissensaustausch und Wissensmanagement in Organisationen auf Basis (technischer) Ontologien eine neue Bedeutung erhalten im Sinne einer gezielten Ermöglichung sozialer Austauschprozesse unter Nutzung formaler Wissensrepräsentationen statt der technologiezentrierten Sichtweise, wonach bereits das Wissensrepräsentationssystem mit Wissensaustausch gleichzusetzen wäre. Letztlich haben die in (formalen) Wissensrepräsentationssystemen dargestellten technischen Ontologien alleine nämlich keine tiefere Bedeutung und auch keinen Sinn. Beides entsteht erst durch eine entsprechende Einbettung und Interpretation dieser Repräsentationen in konkreten lebensweltlichen Zusammenhängen. Und was die Menschen in diesem Interpretations-und Rekontextualisierungsprozess dann aus den zeichenvermittelten technischen Ontologien machen, ist glücklicherweise eine Frage, die sich einer vollständigen Behandlung und Abbildung in technischen Ontologien entzieht."
-
Studer, R.; Studer, H.-P.; Studer, A.: Semantisches Knowledge Retrieval (2001)
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- Content
- Inhalt: 1. Einführung - 2. Wissensmanagement - 3. Information Retrieval - 3.1. Methoden und Techniken - 3.2. Information Retrieval in der Anwendung - 4. Semantische Ansätze - 4.1. Wissen modellieren - Ontologie - 4.2. Neues Wissen inferieren - 5. Knowledge Retrieval in der Anwendung - 6. Zukunftsaussichten - 7. Fazit
-
Hüsken, P.: Information Retrieval im Semantic Web (2006)
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- Abstract
- Das Semantic Web bezeichnet ein erweitertes World Wide Web (WWW), das die Bedeutung von präsentierten Inhalten in neuen standardisierten Sprachen wie RDF Schema und OWL modelliert. Diese Arbeit befasst sich mit dem Aspekt des Information Retrieval, d.h. es wird untersucht, in wie weit Methoden der Informationssuche sich auf modelliertes Wissen übertragen lassen. Die kennzeichnenden Merkmale von IR-Systemen wie vage Anfragen sowie die Unterstützung unsicheren Wissens werden im Kontext des Semantic Web behandelt. Im Fokus steht die Suche nach Fakten innerhalb einer Wissensdomäne, die entweder explizit modelliert sind oder implizit durch die Anwendung von Inferenz abgeleitet werden können. Aufbauend auf der an der Universität Duisburg-Essen entwickelten Retrievalmaschine PIRE wird die Anwendung unsicherer Inferenz mit probabilistischer Prädikatenlogik (pDatalog) implementiert.
-
Assem, M. van; Menken, M.R.; Schreiber, G.; Wielemaker, J.; Wielinga, B.: ¬A method for converting thesauri to RDF/OWL (2004)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Quick Guide to Publishing a Thesaurus on the Semantic Web (2008)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Bandholtz, T.; Schulte-Coerne, T.; Glaser, R.; Fock, J.; Keller, T.: iQvoc - open source SKOS(XL) maintenance and publishing tool (2010)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Gladun, A.; Rogushina, J.: Development of domain thesaurus as a set of ontology concepts with use of semantic similarity and elements of combinatorial optimization (2021)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Assem, M. van; Gangemi, A.; Schreiber, G.: Conversion of WordNet to a standard RDF/OWL representation (2006)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Assem, M. van; Malaisé, V.; Miles, A.; Schreiber, G.: ¬A method to convert thesauri to SKOS (2006)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Drewer, P.; Massion, F; Pulitano, D: Was haben Wissensmodellierung, Wissensstrukturierung, künstliche Intelligenz und Terminologie miteinander zu tun? (2017)
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- Date
- 13.12.2017 14:17:22
-
OWL Web Ontology Language Test Cases (2004)
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- Date
- 14. 8.2011 13:33:22
-
Hauff-Hartig, S.: Wissensrepräsentation durch RDF: Drei angewandte Forschungsbeispiele : Bitte recht vielfältig: Wie Wissensgraphen, Disco und FaBiO Struktur in Mangas und die Humanities bringen (2021)
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- Date
- 22. 5.2021 12:43:05
-
Assem, M. van: Converting and integrating vocabularies for the Semantic Web (2010)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Knorz, G.; Rein, B.: Semantische Suche in einer Hochschulontologie : Ontologie-basiertes Information-Filtering und -Retrieval mit relationalen Datenbanken (2005)
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- Date
- 11. 2.2011 18:22:25
