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Sökning: hsv:(NATURVETENSKAP) hsv:(Data och informationsvetenskap) > Hansen Preben

  • Resultat 1-10 av 156
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1.
  • Ferro, Nicola, et al. (författare)
  • PROMISE Retreat Report Prospects and Opportunities for Information Access Evaluation
  • 2013
  • Ingår i: ACM SIGIR Forum. - : Association for Computing Machinery (ACM). - 0163-5840 .- 1558-0229. ; 46:2, s. 60-84
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The PROMISE network of excellence organized a two-days brainstorming workshop on 30th and 31st May 2012 in Padua, Italy, to discuss and envisage future directions and perspectives for the evaluation of information access and retrieval systems in multiple languages and multiple media. This document reports on the outcomes of this event and provides details about the six envisaged research lines: search applications; contextual evaluation; challenges in test collection design and exploitation; component-based evaluation; ongoing evaluation; and signal-aware evaluation. The ultimate goal of the PROMISE retreat is to stimulate and involve the research community along these research lines and to provide funding agencies with effective and scientifically sound ideas for coordinating and supporting information access research.
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2.
  • Smith, Cameron, et al. (författare)
  • Interaction strategies for an affective conversational agent
  • 2011
  • Ingår i: Presence: Teleoperations and Virtual Environments. - 1054-7460. ; 20:5
  • Tidskriftsartikel (refereegranskat)abstract
    • The development of embodied conversational agents (ECA) as companions brings several challenges for both affective and conversational dialogue. These include challenges in generating appropriate affective responses, selecting the overall shape of the dialogue, providing prompt system response times, and handling interruptions. We present an implementation of such a companion showing the development of individual modules that attempt to address these challenges. Further, to resolve resulting conflicts, we present encompassing interaction strategies that attempt to balance the competing requirements along with dialogues from our working prototype to illustrate these interaction strategies in operation. Finally, we provide the results of an evaluation of the companion using an evaluation methodology created for conversational dialogue and including analysis using appropriateness annotation.
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3.
  • Hansen, Preben, et al. (författare)
  • Exploring manual and automatic query formulation in patent IR : Initial query construction and query generation process
  • 2013
  • Ingår i: Journal of Documentation. - 0022-0418 .- 1758-7379. ; 69:6, s. 873-898
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose – This study aims to examine manually formulated queries and automatic query generation in an early phase of a patent “prior art” search.Design/methodology/approach – The study was performed partly within a patent domain setting, involving three professional patent examiners, and partly in the context of the CLEF 2009 Intellectual Property (CLEF-IP) track. For the exploratory study of user-based query formulation, three patent examiners performed the same three simulated real-life patent tasks. For the automatic query generation, a simple term-weighting algorithm based on the RATF formula was used. The manually and automatically created queries were compared to analyse what kinds of keywords and from which parts of the patent documents were selected.Findings – For user-formulated queries, it was found that patent documents were read in a specific order of importance and that the time varied. Annotations and collaboration were made while reading and selecting/ranking terms. Ranking terms was experienced to be harder than selecting terms. For the automatic formulated queries, it was found that the term frequencies used in the RATF alone will not quite approximate what terms will be judged as relevant query terms by the users. Simultaneously, the results suggest that developing a query generation tool for generating initial queries based on patent documents is feasible.Research limitations/implications – These preliminary but informative results need to be viewed in the light that only three patent experts were observed and that a small set of topics was used.Originality/value – It is usually difficult to get access to the setting of the patent domain and the results of the study show that the methodology provided a feasible way to study manual and the manual query formulation of the patent engineer.
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4.
  • Hansen, Preben, et al. (författare)
  • Effects of Foreign Language and Task Scenario on Relevance Assessment
  • 2005
  • Ingår i: Journal of Documentation. - : Emerald. - 0022-0418 .- 1758-7379. ; 61:5, s. 623-639
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose ? This paper aims to investigate how readers assess relevance of retrieved documents in a foreign language they know well compared with their native language, and whether work-task scenario descriptions have effect on the assessment process. Design/methodology/approach ? Queries, test collections, and relevance assessments were used from the 2002 Interactive CLEF. Swedish first-language speakers, fluent in English, were given simulated information-seeking scenarios and presented with retrieval results in both languages. Twenty-eight subjects in four groups were asked to rate the retrieved text documents by relevance. A two-level work-task scenario description framework was developed and applied to facilitate the study of context effects on the assessment process. Findings ? Relevance assessment takes longer in a foreign language than in the user first language. The quality of assessments by comparison with pre-assessed results is inferior to those made in the users’ first language. Work-task scenario descriptions had an effect on the assessment process, both by measured access time and by self-report by subjects. However, effects on results by traditional relevance ranking were detectable. This may be an argument for extending the traditional IR experimental topical relevance measures to cater for context effects. Originality/value ? An extended two-level work-task scenario description framework was developed and applied. Contextual aspects had an effect on the relevance assessment process. English texts took longer to assess than Swedish and were assessed less well, especially for the most difficult queries. The IR research field needs to close this gap and to design information access systems with users’ language competence in mind.
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5.
  • Hansen, Preben, et al. (författare)
  • A Use Case Framework for Information Access Evaluation
  • 2014
  • Ingår i: Professional Search in the Modern World. - Cham : Springer. - 9783319125107 - 9783319125114 ; , s. 6-22
  • Bokkapitel (refereegranskat)abstract
    • Information access is no longer only a question of retrieving topical text documents in a work-task related context. Information search has become one of the most common uses of the personal computers; a daily task for millions of individual users searching for information motivated by information needs they experience for some reason, momentarily or continuously. Instead of professionally edited text documents, multilingual and multimedia content from a variety of sources of varying quality needs to be accessed. Even the scope of the research efforts in the field must therefore be broadened to better capture the mechanisms for the systems’ impact, take-up and success in the marketplace. Much work has been carried out in this direction: graded relevance, and new evaluation metrics, more varied document collections used in evaluation and different search tasks evaluated. The research in the field is however fragmented. Despite that the need for a common evaluation framework is widely acknowledged, such framework is still not in place. IR system evaluation results are not regularly validated in Interactive IR or field studies; the infrastructure for generalizing Interactive IR results over tasks, users and collections is still missing. This chapter presents a use case-based framework for experimental design in the field of interactive information access. Use cases in general connect system design and evaluation to interaction and user goals, and help identifying test cases for different user groups of a system. We suggest that use cases can provide a useful link even between information access system usage and evaluation mechanisms and thus bring together research from the different related research fields. In this chapter we discuss how use cases can guide the developments of rich models of users, domains, environments, and interaction, and make explicit how the models are connected to benchmarking mechanisms. We give examples of the central features of the different models. The framework is highlighted by examples that sketch out how the framework can be productively used in experimental design and reporting with a minimal threshold for adoption.
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6.
  • Wang, Jianmin, et al. (författare)
  • Experimental Study on Abstract Expression of Human-Robot Emotional Communication
  • 2021
  • Ingår i: Symmetry. - : MDPI AG. - 2073-8994. ; 13:9
  • Tidskriftsartikel (refereegranskat)abstract
    • With the continuous development of intelligent product interaction technology, the facial expression design of virtual images on the interactive interface of intelligent products has become an important research topic. Based on the current research on facial expression design of existing intelligent products, we symmetrically mapped the PAD (pleasure-arousal-dominance) emotion value to the image design, explored the characteristics of abstract expressions and the principles of expression design, and evaluated them experimentally. In this study, the experiment of PAD scores was conducted on the emotion expression design of abstract expressions, and the data results were analyzed to iterate the expression design. The experimental results show that PAD values can effectively guide designers in expression design. Meanwhile, the efficiency and recognition accuracy of human communication with abstract expression design can be improved by facial auxiliary elements and eyebrows.
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7.
  • Bahati, Bernard, et al. (författare)
  • Measuring Learner Satisfaction with Formative e-Assessment Strategies
  • 2019
  • Ingår i: International Journal. - : International Association of Online Engineering (IAOE). - 1868-8799 .- 1863-0383. ; 14:7, s. 61-79
  • Tidskriftsartikel (refereegranskat)abstract
    • The student experience with different aspects of online instructional settings has been the focus of educational practitioners and researchers in many studies. However, concerning technology-enabled formative assessment, little is known about student satisfaction regarding different possible formative e-assessment strategies the students are involved in. Using a 5-point Likert scale questionnaire, a web-based survey was developed to examine students’ satisfaction with the formative e-assessment strategies within an enriched virtual blended course. The results show that, in general, the students were satisfied with the quality of their engagement and the quality of feedback across all the formative e-assessment activities offered. The results also show that the student satisfaction varied between and within the formative e-assessment strategies. However, the gap between the student satisfaction mean ratings across all formative e-assessment strategies was marginal and could not help researchers decide upon which formative e-assessment strategy that stood out as the most preferred one. Learner satisfaction with different formative e-assessment strategies was positively correlated to each other at various levels but no relationship was found between students’ scores on the final course exam and learner satisfaction with formative e-assessment strategies. In the end, the study recommends a sustained and integrated use of the all three formative e-assessment strategies (online knowledge survey, online student-generated questions and peer-responses, and electronic reflective journals) in the context of hybrid courses. Further studies that would widen, diversify both the scope and the research instruments to investigate learner satisfaction with formative e-assessment strategies were also suggested.
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10.
  • Boman, Magnus, et al. (författare)
  • Human Grid : En förstudie
  • 2007. - 2
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Vi har granskat förutsättningarna och möjligheterna att implementera Human Grid: en så kallad mellanprogramvara för att integrera samarbetsfrämjande IT-lösningar som redan idag finns i datorer och telefoner, med hänsyn tagen till formella och informella sociala nätverk.
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