Search (3 results, page 1 of 1)

  • × author_ss:"Muresan, G."
  1. White, R.W.; Marchionini, G.; Muresan, G.: Evaluating exploratory search systems : introduction to special topic issue of information processing and management (2008) 0.01 
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    Source
    Information processing and management. 44(2008) no.2, S.433-436
  2. Muresan, G.; Harper, D.J.: Topic modeling for mediated access to very large document collections (2004) 0.00 
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    Abstract
    Clear and precise queries are a necessity when searching very large document collections, especially when query-based retrieval is the only means of exploration. We propose system-mediated information access as a solution for users' well-documented inability to formulate good queries. Our approach is based an two main assumptions: first, an the ability of document clustering to reveal the topical, semantic structure of a problem domain represented by a specialized "source collection," and, second, an the capacity of statistical language models to convey content. Taking the role of the human mediator or intermediary searcher, a mediation system interacts with the user and supports her exploration of a relatively small source collection, chosen to be representative for the problem domain. Based an the user's selection of relevant "exemplary" documents and clusters from this source collection, the system builds a language model of her information need. This model is subsequently used to derive "mediated queries," which are expected to convey precisely and comprehensively the user's information need, and can be submitted by the user to search any large and heterogeneous "target collections." We present results of experiments that simulated various mediation strategies and compared the effect an mediation effectiveness of a variety of parameters, such as the similarity measure, the weighting scheme, and the clustering method. They provide both upperbounds of performance that can potentially be reached by real end users and a comparison between the effectiveness of these strategies. The experimental evidence suggests that information retrieval mediated through a clustered specialized collection has potential to improve effectiveness significantly.
    Source
    Journal of the American Society for Information Science and Technology. 55(2004) no.10, S.892-910
  3. Lee, H.-J.; Muresan, G.: Mediated Web information retrieval for a complex searching task (2009) 0.00 
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    Abstract
    The goal of this study is to understand whether providing a search intermediary familiar with a problem domain and its topical structure would support a user's Web searching tasks, especially complicated tasks with multifaceted topics, and whether the order of searching tasks or system usage influences their successful completion. This study investigates the effect of two factors, the interaction mode and the display layout, on the three main measures of the user's Web searching behaviors: effectiveness, efficiency, and usability. Two interaction modes are compared, mediation via a domain-specific document collection versus nonmediated search, and two display layouts, a combination of browsing-supporting hierarchic display and ranked list of results versus the simple linear list of search results. The results are analyzed in the Flow theory point of view; they were analyzed by order of the tasks and system usage order. The findings of this study contribute to a better understanding of how the mediation system and/or the combined display support a Web information user.
    Source
    Journal of the American Society for Information Science and Technology. 60(2009) no.7, S.1372-1391

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