-
Tramullas, J.; Garrido-Picazo, P.; Sánchez-Casabón, A.I.: Use of Wikipedia categories on information retrieval research : a brief review (2020)
0.04
0.03586427 = product of:
0.10759281 = sum of:
0.10759281 = weight(_text_:systematic in 5365) [ClassicSimilarity], result of:
0.10759281 = score(doc=5365,freq=2.0), product of:
0.28397155 = queryWeight, product of:
5.715473 = idf(docFreq=395, maxDocs=44218)
0.049684696 = queryNorm
0.3788859 = fieldWeight in 5365, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.715473 = idf(docFreq=395, maxDocs=44218)
0.046875 = fieldNorm(doc=5365)
0.33333334 = coord(1/3)
- Abstract
- Wikipedia categories, a classification scheme built for organizing and describing Wikpedia articles, are being applied in computer science research. This paper adopts a systematic literature review approach, in order to identify different approaches and uses of Wikipedia categories in information retrieval research. Several types of work are identified, depending on the intrinsic study of the categories structure, or its use as a tool for the processing and analysis of other documentary corpus different to Wikipedia. Information retrieval is identified as one of the major areas of use, in particular its application in the refinement and improvement of search expressions, and the construction of textual corpus. However, the set of available works shows that in many cases research approaches applied and results obtained can be integrated into a comprehensive and inclusive concept of information retrieval.
-
Gödert, W.: ¬An ontology-based model for indexing and retrieval (2013)
0.02
0.02144916 = product of:
0.064347476 = sum of:
0.064347476 = product of:
0.12869495 = sum of:
0.12869495 = weight(_text_:indexing in 1510) [ClassicSimilarity], result of:
0.12869495 = score(doc=1510,freq=8.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.6766778 = fieldWeight in 1510, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.0625 = fieldNorm(doc=1510)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- Starting from an unsolved problem of information retrieval this paper presents an ontology-based model for indexing and retrieval. The model combines the methods and experiences of cognitive-to-interpret indexing languages with the strengths and possibilities of formal knowledge representation. The core component of the model uses inferences along the paths of typed relations between the entities of a knowledge representation for enabling the determination of hit quantities in the context of retrieval processes. The entities are arranged in aspect-oriented facets to ensure a consistent hierarchical structure. The possible consequences for indexing and retrieval are discussed.
-
Cumyn, M.; Reiner, G.; Mas, S.; Lesieur, D.: Legal knowledge representation using a faceted scheme (2019)
0.02
0.015166845 = product of:
0.045500536 = sum of:
0.045500536 = product of:
0.09100107 = sum of:
0.09100107 = weight(_text_:indexing in 5788) [ClassicSimilarity], result of:
0.09100107 = score(doc=5788,freq=4.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.47848347 = fieldWeight in 5788, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.0625 = fieldNorm(doc=5788)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- A database supports legal research by matching a user's request for information with documents of the database that contain it. Indexes are among the oldest tools to achieve that aim. Many legal publishers continue to provide manual subject indexing of legal documents, in addition to automatic full-text indexing, which improves the performance of a full-text search.
-
Kara, S.: ¬An ontology-based retrieval system using semantic indexing (2012)
0.01
0.013931636 = product of:
0.041794907 = sum of:
0.041794907 = product of:
0.083589815 = sum of:
0.083589815 = weight(_text_:indexing in 3829) [ClassicSimilarity], result of:
0.083589815 = score(doc=3829,freq=6.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.4395151 = fieldWeight in 3829, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.046875 = fieldNorm(doc=3829)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- In this thesis, we present an ontology-based information extraction and retrieval system and its application to soccer domain. In general, we deal with three issues in semantic search, namely, usability, scalability and retrieval performance. We propose a keyword-based semantic retrieval approach. The performance of the system is improved considerably using domain-specific information extraction, inference and rules. Scalability is achieved by adapting a semantic indexing approach. The system is implemented using the state-of-the-art technologies in SemanticWeb and its performance is evaluated against traditional systems as well as the query expansion methods. Furthermore, a detailed evaluation is provided to observe the performance gain due to domain-specific information extraction and inference. Finally, we show how we use semantic indexing to solve simple structural ambiguities.
-
Paralic, J.; Kostial, I.: Ontology-based information retrieval (2003)
0.01
0.013270989 = product of:
0.039812967 = sum of:
0.039812967 = product of:
0.079625934 = sum of:
0.079625934 = weight(_text_:indexing in 1153) [ClassicSimilarity], result of:
0.079625934 = score(doc=1153,freq=4.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.41867304 = fieldWeight in 1153, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.0546875 = fieldNorm(doc=1153)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- In the proposed article a new, ontology-based approach to information retrieval (IR) is presented. The system is based on a domain knowledge representation schema in form of ontology. New resources registered within the system are linked to concepts from this ontology. In such a way resources may be retrieved based on the associations and not only based on partial or exact term matching as the use of vector model presumes In order to evaluate the quality of this retrieval mechanism, experiments to measure retrieval efficiency have been performed with well-known Cystic Fibrosis collection of medical scientific papers. The ontology-based retrieval mechanism has been compared with traditional full text search based on vector IR model as well as with the Latent Semantic Indexing method.
- Object
- Latent Semantic Indexing
-
Drewer, P.; Massion, F; Pulitano, D: Was haben Wissensmodellierung, Wissensstrukturierung, künstliche Intelligenz und Terminologie miteinander zu tun? (2017)
0.01
0.011219318 = product of:
0.033657953 = sum of:
0.033657953 = product of:
0.06731591 = sum of:
0.06731591 = weight(_text_:22 in 5576) [ClassicSimilarity], result of:
0.06731591 = score(doc=5576,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.38690117 = fieldWeight in 5576, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.078125 = fieldNorm(doc=5576)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 13.12.2017 14:17:22
-
Tudhope, D.; Hodge, G.: Terminology registries (2007)
0.01
0.011219318 = product of:
0.033657953 = sum of:
0.033657953 = product of:
0.06731591 = sum of:
0.06731591 = weight(_text_:22 in 539) [ClassicSimilarity], result of:
0.06731591 = score(doc=539,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.38690117 = fieldWeight in 539, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.078125 = fieldNorm(doc=539)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 26.12.2011 13:22:07
-
OWL Web Ontology Language Test Cases (2004)
0.01
0.008975455 = product of:
0.026926363 = sum of:
0.026926363 = product of:
0.053852726 = sum of:
0.053852726 = weight(_text_:22 in 4685) [ClassicSimilarity], result of:
0.053852726 = score(doc=4685,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.30952093 = fieldWeight in 4685, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=4685)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- 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)
0.01
0.008975455 = product of:
0.026926363 = sum of:
0.026926363 = product of:
0.053852726 = sum of:
0.053852726 = weight(_text_:22 in 318) [ClassicSimilarity], result of:
0.053852726 = score(doc=318,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.30952093 = fieldWeight in 318, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=318)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 22. 5.2021 12:43:05
-
Assem, M. van; Malaisé, V.; Miles, A.; Schreiber, G.: ¬A method to convert thesauri to SKOS (2006)
0.01
0.0080434345 = product of:
0.024130303 = sum of:
0.024130303 = product of:
0.048260607 = sum of:
0.048260607 = weight(_text_:indexing in 4642) [ClassicSimilarity], result of:
0.048260607 = score(doc=4642,freq=2.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.2537542 = fieldWeight in 4642, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.046875 = fieldNorm(doc=4642)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- Thesauri can be useful resources for indexing and retrieval on the Semantic Web, but often they are not published in RDF/OWL. To convert thesauri to RDF for use in Semantic Web applications and to ensure the quality and utility of the conversion a structured method is required. Moreover, if different thesauri are to be interoperable without complicated mappings, a standard schema for thesauri is required. This paper presents a method for conversion of thesauri to the SKOS RDF/OWL schema, which is a proposal for such a standard under development by W3Cs Semantic Web Best Practices Working Group. We apply the method to three thesauri: IPSV, GTAA and MeSH. With these case studies we evaluate our method and the applicability of SKOS for representing thesauri.
-
Schreiber, G.; Amin, A.; Assem, M. van; Boer, V. de; Hardman, L.; Hildebrand, M.; Hollink, L.; Huang, Z.; Kersen, J. van; Niet, M. de; Omelayenko, B.; Ossenbruggen, J. van; Siebes, R.; Taekema, J.; Wielemaker, J.; Wielinga, B.: MultimediaN E-Culture demonstrator (2006)
0.01
0.0080434345 = product of:
0.024130303 = sum of:
0.024130303 = product of:
0.048260607 = sum of:
0.048260607 = weight(_text_:indexing in 4648) [ClassicSimilarity], result of:
0.048260607 = score(doc=4648,freq=2.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.2537542 = fieldWeight in 4648, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.046875 = fieldNorm(doc=4648)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- The main objective of the MultimediaN E-Culture project is to demonstrate how novel semantic-web and presentation technologies can be deployed to provide better indexing and search support within large virtual collections of culturalheritage resources. The architecture is fully based on open web standards in particular XML, SVG, RDF/OWL and SPARQL. One basic hypothesis underlying this work is that the use of explicit background knowledge in the form of ontologies/vocabularies/thesauri is in particular useful in information retrieval in knowledge-rich domains. This paper gives some details about the internals of the demonstrator.
-
Tzitzikas, Y.; Spyratos, N.; Constantopoulos, P.; Analyti, A.: Extended faceted ontologies (2002)
0.01
0.0080434345 = product of:
0.024130303 = sum of:
0.024130303 = product of:
0.048260607 = sum of:
0.048260607 = weight(_text_:indexing in 2280) [ClassicSimilarity], result of:
0.048260607 = score(doc=2280,freq=2.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.2537542 = fieldWeight in 2280, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.046875 = fieldNorm(doc=2280)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- 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.
-
Knorz, G.; Rein, B.: Semantische Suche in einer Hochschulontologie : Ontologie-basiertes Information-Filtering und -Retrieval mit relationalen Datenbanken (2005)
0.01
0.007853523 = product of:
0.023560567 = sum of:
0.023560567 = product of:
0.047121134 = sum of:
0.047121134 = weight(_text_:22 in 4324) [ClassicSimilarity], result of:
0.047121134 = score(doc=4324,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.2708308 = fieldWeight in 4324, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=4324)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 11. 2.2011 18:22:25
-
Mayfield, J.; Finin, T.: Information retrieval on the Semantic Web : integrating inference and retrieval
0.01
0.007853523 = product of:
0.023560567 = sum of:
0.023560567 = product of:
0.047121134 = sum of:
0.047121134 = weight(_text_:22 in 4330) [ClassicSimilarity], result of:
0.047121134 = score(doc=4330,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.2708308 = fieldWeight in 4330, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=4330)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 12. 2.2011 17:35:22
-
Priss, U.: Faceted knowledge representation (1999)
0.01
0.007853523 = product of:
0.023560567 = sum of:
0.023560567 = product of:
0.047121134 = sum of:
0.047121134 = weight(_text_:22 in 2654) [ClassicSimilarity], result of:
0.047121134 = score(doc=2654,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.2708308 = fieldWeight in 2654, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=2654)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 22. 1.2016 17:30:31
-
Styltsvig, H.B.: Ontology-based information retrieval (2006)
0.01
0.0075834226 = product of:
0.022750268 = sum of:
0.022750268 = product of:
0.045500536 = sum of:
0.045500536 = weight(_text_:indexing in 1154) [ClassicSimilarity], result of:
0.045500536 = score(doc=1154,freq=4.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.23924173 = fieldWeight in 1154, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.03125 = fieldNorm(doc=1154)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- In this thesis, we will present methods for introducing ontologies in information retrieval. The main hypothesis is that the inclusion of conceptual knowledge such as ontologies in the information retrieval process can contribute to the solution of major problems currently found in information retrieval. This utilization of ontologies has a number of challenges. Our focus is on the use of similarity measures derived from the knowledge about relations between concepts in ontologies, the recognition of semantic information in texts and the mapping of this knowledge into the ontologies in use, as well as how to fuse together the ideas of ontological similarity and ontological indexing into a realistic information retrieval scenario. To achieve the recognition of semantic knowledge in a text, shallow natural language processing is used during indexing that reveals knowledge to the level of noun phrases. Furthermore, we briefly cover the identification of semantic relations inside and between noun phrases, as well as discuss which kind of problems are caused by an increase in compoundness with respect to the structure of concepts in the evaluation of queries. Measuring similarity between concepts based on distances in the structure of the ontology is discussed. In addition, a shared nodes measure is introduced and, based on a set of intuitive similarity properties, compared to a number of different measures. In this comparison the shared nodes measure appears to be superior, though more computationally complex. Some of the major problems of shared nodes which relate to the way relations differ with respect to the degree they bring the concepts they connect closer are discussed. A generalized measure called weighted shared nodes is introduced to deal with these problems. Finally, the utilization of concept similarity in query evaluation is discussed. A semantic expansion approach that incorporates concept similarity is introduced and a generalized fuzzy set retrieval model that applies expansion during query evaluation is presented. While not commonly used in present information retrieval systems, it appears that the fuzzy set model comprises the flexibility needed when generalizing to an ontology-based retrieval model and, with the introduction of a hierarchical fuzzy aggregation principle, compound concepts can be handled in a straightforward and natural manner.
-
Definition of the CIDOC Conceptual Reference Model (2003)
0.01
0.0067315903 = product of:
0.02019477 = sum of:
0.02019477 = product of:
0.04038954 = sum of:
0.04038954 = weight(_text_:22 in 1652) [ClassicSimilarity], result of:
0.04038954 = score(doc=1652,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.23214069 = fieldWeight in 1652, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=1652)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 6. 8.2010 14:22:28
-
Hollink, L.; Assem, M. van: Estimating the relevance of search results in the Culture-Web : a study of semantic distance measures (2010)
0.01
0.0067315903 = product of:
0.02019477 = sum of:
0.02019477 = product of:
0.04038954 = sum of:
0.04038954 = weight(_text_:22 in 4649) [ClassicSimilarity], result of:
0.04038954 = score(doc=4649,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.23214069 = fieldWeight in 4649, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=4649)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 26.12.2011 13:40:22
-
Bittner, T.; Donnelly, M.; Winter, S.: Ontology and semantic interoperability (2006)
0.01
0.0067315903 = product of:
0.02019477 = sum of:
0.02019477 = product of:
0.04038954 = sum of:
0.04038954 = weight(_text_:22 in 4820) [ClassicSimilarity], result of:
0.04038954 = score(doc=4820,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.23214069 = fieldWeight in 4820, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=4820)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 3.12.2016 18:39:22
-
Priss, U.: Description logic and faceted knowledge representation (1999)
0.01
0.0067315903 = product of:
0.02019477 = sum of:
0.02019477 = product of:
0.04038954 = sum of:
0.04038954 = weight(_text_:22 in 2655) [ClassicSimilarity], result of:
0.04038954 = score(doc=2655,freq=2.0), product of:
0.17398734 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.049684696 = queryNorm
0.23214069 = fieldWeight in 2655, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=2655)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 22. 1.2016 17:30:31
