Search (30 results, page 1 of 2)

  • × author_ss:"Ingwersen, P."
  1. Ingwersen, P.; Wormell, I.: Modern indexing and retrieval techniques matching different types of information needs (1989) 0.05 
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    Source
    International forum on information and documentation. 14(1989), S.17-22
    Type
    a
  2. Ingwersen, P.: Information and information science in context (1992) 0.02 
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    Theme
    Information
    Type
    a
  3. Larsen, B.; Ingwersen, P.; Lund, B.: Data fusion according to the principle of polyrepresentation (2009) 0.02 
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    Abstract
    We report data fusion experiments carried out on the four best-performing retrieval models from TREC 5. Three were conceptually/algorithmically very different from one another; one was algorithmically similar to one of the former. The objective of the test was to observe the performance of the 11 logical data fusion combinations compared to the performance of the four individual models and their intermediate fusions when following the principle of polyrepresentation. This principle is based on cognitive IR perspective (Ingwersen & Järvelin, 2005) and implies that each retrieval model is regarded as a representation of a unique interpretation of information retrieval (IR). It predicts that only fusions of very different, but equally good, IR models may outperform each constituent as well as their intermediate fusions. Two kinds of experiments were carried out. One tested restricted fusions, which entails that only the inner disjoint overlap documents between fused models are ranked. The second set of experiments was based on traditional data fusion methods. The experiments involved the 30 TREC 5 topics that contain more than 44 relevant documents. In all tests, the Borda and CombSUM scoring methods were used. Performance was measured by precision and recall, with document cutoff values (DCVs) at 100 and 15 documents, respectively. Results show that restricted fusions made of two, three, or four cognitively/algorithmically very different retrieval models perform significantly better than do the individual models at DCV100. At DCV15, however, the results of polyrepresentative fusion were less predictable. The traditional fusion method based on polyrepresentation principles demonstrates a clear picture of performance at both DCV levels and verifies the polyrepresentation predictions for data fusion in IR. Data fusion improves retrieval performance over their constituent IR models only if the models all are quite conceptually/algorithmically dissimilar and equally and well performing, in that order of importance.
    Date
    22. 3.2009 18:48:28
    Source
    Journal of the American Society for Information Science and Technology. 60(2009) no.4, S.646-654
    Type
    a
  4. Ingwersen, P.: Information and information science (1995) 0.01 
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    Source
    Encyclopedia of library and information science. Vol.56, [=Suppl.19]
    Theme
    Information
    Type
    a
  5. Ingwersen, P.: Psychological aspects of information retrieval (1984) 0.01 
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    Source
    Social science information studies. 4(1984), S.83-95
    Type
    a
  6. Ingwersen, P.: Europe and information science (1997) 0.01 
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    Source
    Journal of the American Society for Information Science. 48(1997) no.12, S.1139-1141
    Type
    a
  7. Ingwersen, P.: Cognitive analysis and the role of the intermediary in information retrieval (1986) 0.01 
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    Source
    Intelligent information systems: progress and prospects. Ed.: R. Davies
    Type
    a
  8. Ingwersen, P.; Johansen, T.; Timmermann, P.: User-librarian negotiations and search procedures : a progress report (1980) 0.01 
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    Source
    Theory and application of information research. Proc. of the 2nd Int. Research Forum on Information Science, 3.-6.8.1977, Copenhagen. Ed.: O. Harbo u. L. Kajberg
    Type
    a
  9. Ingwersen, P.: ¬The cognitive perspective in information retrieval (1994) 0.01 
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    Abstract
    Outlines the principles underlying the theory of polyrepresentation applied to the user's cognitive space and the information space of information retrieval systems, set in a cognitive framework. Uses polyrepresentation to represent the current user's information needs, problem states, and domain work tasks or interests in a structure of causality, as well as to embody semantic full text entities by means of the principle of 'intentional redundancy'
    Source
    International forum on information and documentation. 19(1994) no.2, S.25-32
    Theme
    Information
    Type
    a
  10. Ingwersen, P.: Information science as a cognitive science (1994) 0.01 
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  11. Ingwersen, P.; Wormell, I.: Means to improve subject access and representation in modern information retrieval (1988) 0.01 
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  12. Borlund, P.; Ingwersen, P.: ¬The development of a method for the evaluation of interactive information retrieval systems (1997) 0.01 
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    Abstract
    Describes the development of a methods for the evaluation and comparison of interactive information retrieval systems. The method is based on the introduction of the concept of a 'simulated work task situation' or scenario and the involvement of real end users as test persons. The relevance assessments are made with reference to the concepts of situational as well as topic relevance, assessed in a non binary way and calculated as precision. The method is further based on a mixture of simulated and real information needs, and involves also assessments made by individual panel memebers
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    a
  13. Ingwersen, P.: ¬The cognitive framework for information retrieval : a paradigmatic perspective (1996) 0.01 
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    Abstract
    The paper presents the principles underlying the cognitive framework for Information Retrieval (IR). It introduces the concept of polyrepresentation applied simultaneously to the user's cognitive space and the information space of IR systems. The concept seeks to represent the current user's information need, problem state, and domain work task or interest in a structure of causality. Further, it suggests to apply different methods of representation and a variety of IR techniques of 'different cognitive and functional origin' simultaneously to each information object in the information space. The cognitive differences between such representations imply that by applying 'cognitive retrieval overlaps' of information objects, originating from different interpretations of such objects over time and by type, the degree of uncertainty inherent in IR is decreased and the intellectual access possibilities are increased. One consequence of the framework is its capability to elucidate the seemingly dubious assumptions underlying the predominant algorithmic retrieval models, such as, the vector space and probabilistic models
    Type
    a
  14. Ingwersen, P.; Willett, P.: ¬An introduction to algorithmic and cognitive approaches for information retrieval (1995) 0.01 
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    Abstract
    This paper provides an over-view of 2, complementary approaches to the design and implementation of information retrieval systems. The first approach focuses on the algorithms and data structures that are needed to maximise the effectiveness and the efficiency of the searches that can be carried out on text databases, while the second adopts a cognitive approach that focuses on the role of the user and of the knowledge sources involved in information retrieval. The paper argues for an holistic view of information retrieval that is capable of encompassing both of these approaches
    Type
    a
  15. Björneborn, L.; Ingwersen, P.: Toward a basic framework for Webometrics (2004) 0.01 
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    Abstract
    In this article, we define webometrics within the framework of informetric studies and bibliometrics, as belonging to library and information science, and as associated with cybermetrics as a generic subfield. We develop a consistent and detailed link typology and terminology and make explicit the distinction among different Web node levels when using the proposed conceptual framework. As a consequence, we propose a novel diagram notation to fully appreciate and investigate link structures between Web nodes in webometric analyses. We warn against taking the analogy between citation analyses and link analyses too far.
    Source
    Journal of the American Society for Information Science and Technology. 55(2004) no.14, S.1216-1227
    Type
    a
  16. Ingwersen, P.: ¬The human approach to information science and management : the framework and prospects underlying the new Danish MSc programme (1994) 0.01 
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    Abstract
    This paper analyzes the conceptual background of the two-year MSC programme in Information Science and Management offered by the Royal School of Librarianship, Denmark, on top of the traditional course in Librarianship. The present state of library and information science (LIS) education is briefly analysed. Within this context, the programme structure and contents are outlined. The conception of information science which forms the background and framework for the programme structure is analysed and discussed. This conception of LIS emphasises a more profound human-driven approach to the domains of the discipline, and views information, technology, people, and the management aspects involved from a global perspective. The anticipated epistemological consequences of the human dimension are challenged. The major experiences gained from developing the Master's programme are analysed and the current syllabus described
    Source
    Journal of information science. 20(1994) no.3, S.197-208
    Type
    a
  17. Ingwersen, P.: Cognitive perspectives of information retrieval interaction : elements of a cognitive IR theory (1996) 0.01 
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    Abstract
    The objective of this paper is to amalgamate theories of text retrieval from various research traditions into a cognitive theory for information retrieval interaction. Set in a cognitive framework, the paper outlines the concept of polyrepresentation applied to both the user's cognitive space and the information space of IR systems. The concept seeks to represent the current user's information need, problem state, and domain work task or interest in a structure of causality. Further, it implies that we should apply different methods of representation and a variety of IR techniques of different cognitive and functional origin simultaneously to each semantic full-text entity in the information space. The cognitive differences imply that by applying cognitive overlaps of information objects, originating from different interprestations of such objects through time and by type, the degree of uncertainty inherent in IR is decreased. ... The lack of consistency among authors, indexers, evaluators or users is of an identical cognitive nature. It is unavoidable, and indeed favourable to IR. In particular, for full-text retrieval, alternative semantic entities, including Salton 'et al.'s' 'passage retrieval', are proposed to replace the traditional document record as the basic retrieval entity. These empirically observed phenomena of inconsistency and of semantic entities and values associated with data interpretation support strongly a cognitive approach to IR and the logical use of olypresentation, cognitive overlaps, and both data fusion and data diffusion
    Type
    a
  18. Ingwersen, P.: Information retrieval interaction (1992) 0.01 
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    Abstract
    "Ingwersen defines IR interaction as the interactive communication processes that occur between the use, the intermediary (machine or human) and the IR system (text or database). The cognitive viewpoint takes into account the variety of states of knowledge associated with these major participants and thus allows a holistic treatment."
    COMPASS
    Information retrieval
    Footnote
    Rez. in: Library and information research news. 16(1993) no.56, S.26-27 (J. Palmer); Journal of documentation 50(1994) no.2, S.142-144 (P. Willett); Australian academic and research libraries 1993, Sept., S.239-240 (C. Wilson)
    Subject
    Information retrieval
  19. Järvelin, K.; Ingwersen, P.: User-oriented and cognitive models of information retrieval (2009) 0.01 
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    Abstract
    The domain of user-oriented and cognitive information retrieval (IR) is first discussed, followed by a discussion on the dimensions and types of models one may build for the domain. The focus of the present entry is on the models of user-oriented and cognitive IR, not on their empirical applications. Several models with different emphases on user-oriented and cognitive IR are presented-ranging from overall approaches and relevance models to procedural models, cognitive models, and task-based models. The present entry does not discuss empirical findings based on the models.
    Source
    Encyclopedia of library and information sciences. 3rd ed. Ed.: M.J. Bates
    Type
    a
  20. Skov, M.; Larsen, B.; Ingwersen, P.: Inter and intra-document contexts applied in polyrepresentation for best match IR (2008) 0.01 
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    Abstract
    The principle of polyrepresentation offers a theoretical framework for handling multiple contexts in information retrieval (IR). This paper presents an empirical laboratory study of polyrepresentation in restricted mode of the information space with focus on inter and intra-document features. The Cystic Fibrosis test collection indexed in the best match system InQuery constitutes the experimental setting. Overlaps between five functionally and/or cognitively different document representations are identified. Supporting the principle of polyrepresentation, results show that in general overlaps generated by three or four representations of different nature have higher precision than those generated from two representations or the single fields. This result pertains to both structured and unstructured query mode in best match retrieval, however, with the latter query mode demonstrating higher performance. The retrieval overlaps containing search keys from the bibliographic references provide the best retrieval performance and minor MeSH terms the worst. It is concluded that a highly structured query language is necessary when implementing the principle of polyrepresentation in a best match IR system because the principle is inherently Boolean. Finally a re-ranking test shows promising results when search results are re-ranked according to precision obtained in the overlaps whilst re-ranking by citations seems less useful when integrated into polyrepresentative applications.
    Source
    Information processing and management. 44(2008) no.5, S.1673-1683
    Type
    a

Authors

Years

Types

  • a 28
  • m 2

Themes