This book constitutes the refereed proceedings of the Second
International Conference on the Theory of Information Retrieval,
ICTIR 2009, held in Cambridge, UK, in September 2009.
The 18 revised full papers, 14 short papers, and 11 posters
presented together with one invited talk were carefully reviewed
and selected from 82 submissions. The papers are categorized into
four main themes: novel IR models, evaluation, efficiency, and new
perspectives in IR. Twenty-one papers fall into the general theme
of novel IR models, ranging from various retrieval models, query
and term selection models, Web IR models, developments in novelty
and diversity, to the modeling of user aspects. There are four
papers on new evaluation methodologies, e.g., modeling score
distributions, evaluation over sessions, and an axiomatic framework
for XML retrieval evaluation. Three papers focus on the issue of
efficiency and offer solutions to improve the tractability of
PageRank, data cleansing practices for training classifiers, and
approximate search for distributed IR. Finally, four papers look
into new perspectives of IR and shed light on some new emerging
areas of interest, such as the application and adoption of quantum
theory in IR.
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