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We report findings that help us better understand the difficulty of tasks which involve information seeking, retrieving, gathering, and use. We examined the data gathered from two interactive information retrieval user studies on how users' perception of task difficulty changes before and after searching for information to solve tasks, and how the(More)
In this paper, we report findings on an examination of the document selecting behaviors of people with different levels of domain knowledge (DK). We found that people with high and low DK levels generally select different sets of documents to view; those high in DK read more documents and gave higher relevance ratings for the documents they view than those(More)
Studies have shown that cognitive styles have some impacts on user performance in various types of systems. The current study focused on the effects of cognitive styles on users' information-seeking task performance between an information visualization system and a generic information system. Thirty-two graduate students participated in a controlled(More)
OBJECTIVE Langerhans cell histiocytosis is an unusual disorder of unknown etiology with heterogeneous clinical behaviors and variable outcomes. It can involve one or more organs or systems, but to our best knowledge, parotid glands involvement in Langerhans cell histiocytosis is extremely rare in English literature. METHOD We report a 13-month-old girl(More)
BACKGROUND Sacrococcygeal teratoma (SCT) is a relatively uncommon tumor. Recurrence with poor survival and anorectal dysfunction are the 2 leading problems for patients. Here, we would review the clinic features of patients with SCTs in our hospital to identify risk factors of recurrent SCTs and to analyze anorectal functional sequelae. MATERIAL AND METHODS(More)
Users of digital libraries and other information systems typically carry out searches with very short queries, on the order of two words or so. This makes it very difficult for the systems to disambiguate their queries and identify potentially relevant documents, resulting in sub-optimal retrieval performance. We hypothesize that users will provide better(More)
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