Literatur zur Informationserschließung

Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.

© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft / Powered by litecat, BIS Oldenburg (Stand: 28. April 2022)

Suchergebnisse

• 1
  Vechtomova, O. ; Robertson, S.E.: ¬A domain-independent approach to finding related entities.
  In: Information processing and management. 48(2012) no.4, S.654-670.
  
  Abstract: We propose an approach to the retrieval of entities that have a specific relationship with the entity given in a query. Our research goal is to investigate whether related entity finding problem can be addressed by combining a measure of relatedness of candidate answer entities to the query, and likelihood that the candidate answer entity belongs to the target entity category specified in the query. An initial list of candidate entities, extracted from top ranked documents retrieved for the query, is refined using a number of statistical and linguistic methods. The proposed method extracts the category of the target entity from the query, identifies instances of this category as seed entities, and computes similarity between candidate and seed entities. The evaluation was conducted on the Related Entity Finding task of the Entity Track of TREC 2010, as well as the QA list questions from TREC 2005 and 2006. Evaluation results demonstrate that the proposed methods are effective in finding related entities.
  
  Inhalt: Vgl.: doi:10.1016/j.ipm.2011.12.003.
  
  Themenfeld: Semantisches Umfeld in Indexierung u. Retrieval
  
  
• 2
  Robertson, S.: On the history of evaluation in IR.
  In: Information science in transition, Ed.: A. Gilchrist. London : Facet Publ., 2009. S.63-93.
  
  Abstract: This paper is a personal take on the history of evaluation experiments in information retrieval. It describes some of the early experiments that were formative in our understanding, and goes on to discuss the current dominance of TREC (the Text REtrieval Conference) and to assess its impact.
  
  Themenfeld: Retrievalstudien
  Objekt: TREC
  
  
• 3
  Robertson, S. ; Tait, J.: Karen Sparck Jones.
  In: Journal of the American Society for Information Science and Technology. 59(2008) no.5, S.852-854.
  (In Memoriam)
  
  Themenfeld: Biographische Darstellungen
  
  
• 4
  Robertson, S. ; Tait, J.: In Memoriam Karen Sparck Jones.
  In: Information processing and management. 43(2007) no.6, S.1441-1446.
  
  Abstract: This note is also appearing in the Journal of the American Society for Information Systems and Technology.
  
  Themenfeld: Biographische Darstellungen
  
  
• 5
  MacFarlane, A. ; McCann, J.A. ; Robertson, S.E.: Parallel methods for the update of partitioned inverted files.
  In: Aslib proceedings. 59(2007) no.4/5, S.367-396.
  
  Abstract: Purpose - An issue that tends to be ignored in information retrieval is the issue of updating inverted files. This is largely because inverted files were devised to provide fast query service, and much work has been done with the emphasis strongly on queries. This paper aims to study the effect of using parallel methods for the update of inverted files in order to reduce costs, by looking at two types of partitioning for inverted files: document identifier and term identifier. Design/methodology/approach - Raw update service and update with query service are studied with these partitioning schemes using an incremental update strategy. The paper uses standard measures used in parallel computing such as speedup to examine the computing results and also the costs of reorganising indexes while servicing transactions. Findings - Empirical results show that for both transaction processing and index reorganisation the document identifier method is superior. However, there is evidence that the term identifier partitioning method could be useful in a concurrent transaction processing context. Practical implications - There is an increasing need to service updates, which is now becoming a requirement of inverted files (for dynamic collections such as the web), demonstrating that a shift in requirements of inverted file maintenance is needed from the past. Originality/value - The paper is of value to database administrators who manage large-scale and dynamic text collections, and who need to use parallel computing to implement their text retrieval services.
  
  Themenfeld: Retrievalalgorithmen
  
  
• 6
  Willett, P. ; Robertson, S.: In memoriam: Karen Sparck Jones.
  In: Journal of documentation. 63(2007) no.5, S.xxx-xxx.
  
  Themenfeld: Biographische Darstellungen
  
  
• 7
  Vechtomova, O. ; Karamuftuoglum, M. ; Robertson, S.E.: On document relevance and lexical cohesion between query terms.
  In: Information processing and management. 42(2006) no.5, S.1230-1247.
  
  Abstract: Lexical cohesion is a property of text, achieved through lexical-semantic relations between words in text. Most information retrieval systems make use of lexical relations in text only to a limited extent. In this paper we empirically investigate whether the degree of lexical cohesion between the contexts of query terms' occurrences in a document is related to its relevance to the query. Lexical cohesion between distinct query terms in a document is estimated on the basis of the lexical-semantic relations (repetition, synonymy, hyponymy and sibling) that exist between there collocates - words that co-occur with them in the same windows of text. Experiments suggest significant differences between the lexical cohesion in relevant and non-relevant document sets exist. A document ranking method based on lexical cohesion shows some performance improvements.
  
  Themenfeld: Computerlinguistik
  
  
• 8
  Robertson, S. ; Callan, J.: Routing and filtering.
  In: TREC: experiment and evaluation in information retrieval. Ed.: E.M. Voorhees, u. D.K. Harman. Cambridge, MA : MIT Press, 2005. S.99-122.
  
  Themenfeld: Retrievalstudien
  Objekt: TREC
  
  
• 9
  Robertson, S.: How Okapi came to TREC.
  In: TREC: experiment and evaluation in information retrieval. Ed.: E.M. Voorhees, u. D.K. Harman. Cambridge, MA : MIT Press, 2005. S.287-300.
  
  Themenfeld: Retrievalstudien
  Objekt: TREC ; OKAPI
  
  
• 10
  MacFarlane, A. ; McCann, J.A. ; Robertson, S.E.: Parallel methods for the generation of partitioned inverted files.
  In: Aslib proceedings. 57(2005) no.5, S.434-459.
  
  Abstract: Purpose - The generation of inverted indexes is one of the most computationally intensive activities for information retrieval systems: indexing large multi-gigabyte text databases can take many hours or even days to complete. We examine the generation of partitioned inverted files in order to speed up the process of indexing. Two types of index partitions are investigated: TermId and DocId. Design/methodology/approach - We use standard measures used in parallel computing such as speedup and efficiency to examine the computing results and also the space costs of our trial indexing experiments. Findings - The results from runs on both partitioning methods are compared and contrasted, concluding that DocId is the more efficient method. Practical implications - The practical implications are that the DocId partitioning method would in most circumstances be used for distributing inverted file data in a parallel computer, particularly if indexing speed is the primary consideration. Originality/value - The paper is of value to database administrators who manage large-scale text collections, and who need to use parallel computing to implement their text retrieval services.
  
  Inhalt: Vgl. auch unter: http://www.emeraldinsight.com/10.1108/00012530510621888.
  
  Themenfeld: Retrievalalgorithmen
  
  
• 11
  MacFarlane, A. ; Robertson, S.E. ; McCann, J.A.: Parallel computing for passage retrieval.
  In: Aslib proceedings. 56(2004) no.4, S.201-211.
  
  Abstract: In this paper methods for both speeding up passage processing and examining more passages using parallel computers are explored. The number of passages processed are varied in order to examine the effect on retrieval effectiveness and efficiency. The particular algorithm applied has previously been used to good effect in Okapi experiments at TREC. This algorithm and the mechanism for applying parallel computing to speed up processing are described.
  
  Themenfeld: Retrievalalgorithmen
  Objekt: Okapi ; TREC
  
  
• 12
  Bodoff, D. ; Robertson, S.: ¬A new unified probabilistic model.
  In: Journal of the American Society for Information Science and Technology. 55(2004) no.6, S.471-487.
  
  Abstract: This paper proposes a new unified probabilistic model. Two previous models, Robertson et al.'s "Model 0" and "Model 3," each have strengths and weaknesses. The strength of Model 0 not found in Model 3, is that it does not require relevance data about the particular document or query, and, related to that, its probability estimates are straightforward. The strength of Model 3 not found in Model 0 is that it can utilize feedback information about the particular document and query in question. In this paper we introduce a new unified probabilistic model that combines these strengths: the expression of its probabilities is straightforward, it does not require that data must be available for the particular document or query in question, but it can utilize such specific data if it is available. The model is one way to resolve the difficulty of combining two marginal views in probabilistic retrieval.
  
  Themenfeld: Retrievalalgorithmen
  
  
• 13
  Robertson, S.: Understanding inverse document frequency : on theoretical arguments for IDF.
  In: Journal of documentation. 60(2004) no.5, S.503-520.
  
  Abstract: The term-weighting function known as IDF was proposed in 1972, and has since been extremely widely used, usually as part of a TF*IDF function. It is often described as a heuristic, and many papers have been written (some based on Shannon's Information Theory) seeking to establish some theoretical basis for it. Some of these attempts are reviewed, and it is shown that the Information Theory approaches are problematic, but that there are good theoretical justifications of both IDF and TF*IDF in the traditional probabilistic model of information retrieval.
  
  Anmerkung: Vgl. auch unter:http://www.emeraldinsight.com/10.1108/00220410410560582.
  
  Themenfeld: Retrievalalgorithmen
  Objekt: IDF ; TF*IDF
  
  
• 14
  Hawking, D. ; Robertson, S.: On collection size and retrieval effectiveness.
  In: Information retrieval. 6(2003) no.1, S.99-150.
  
  
  
• 15
  Robertson, S. ; Walker, S.: Threshold setting in adaptive filtering.
  In: Journal of documentation. 56(2000) no.3, S.312-331.
  
  
  
• 16
  Sparck Jones, K. ; Walker, S. ; Robertson, S.E.: ¬A probabilistic model of information retrieval : development and comparative experiments - part 1.
  In: Information processing and management. 36(2000) no.6, S.779-808.
  
  
  
• 17
  Sparck Jones, K. ; Walker, S. ; Robertson, S.E.: ¬A probabilistic model of information retrieval : development and comparative experiments - part 2.
  In: Information processing and management. 36(2000) no.6, S.809-840.
  
  
  
• 18
  Robertson, S.E. ; Walker, S. ; Beaulieu, M.: Experimentation as a way of life : Okapi at TREC.
  In: Information processing and management. 36(2000) no.1, S.95-108.
  
  Themenfeld: OPAC ; Retrievalstudien
  Objekt: Okapi ; TREC
  
  
• 19
  Robertson, S.: In memoriam Cyril W. Cleverdon.
  In: Journal of the American Society for Information Science. 49(1998) no.10, S.866.
  
  
  
• 20
  Robertson, S.E. ; Walker, S. ; Beaulieu, M.: Laboratory experiments with Okapi : participation in the TREC programme.
  In: Journal of documentation. 53(1997) no.1, S.20-34.
  
  Abstract: Briefly reviews the history of laboratory testing of information retrieval systems, focusing on the idea of a general purpose test collection of documents, queries and relevance judgements. Gives an overview of the methods used in TREC (Text Retrieval Conference) which is concerned with an ideal test collection, and discusses the Okapi team's participation in TREC. Also discusses some of the issues surrounding the difficult problem of interactive evaluation in TREC. The reconciliation of the requirements of the laboratory context with the concerns of interactive retrieval has a long way to go
  
  Inhalt: Vgl. auch unter: http://www.emeraldinsight.com/10.1108/EUM0000000007188.
  
  Anmerkung: Contribution to a thematic issue on Okapi and information retrieval research ;
  
  Themenfeld: Retrievalstudien
  Objekt: Okapi