abstract = "Both ranking functions and user queries are very
important factors affecting a search engine's
performance. Prior research has looked at how to
improve ad-hoc retrieval performance for existing
queries while tuning the ranking function, or modify
and expand user queries using a fixed ranking scheme
using blind feedback. However, almost no research has
looked at how to combine ranking function tuning and
blind feedback together to improve ad-hoc retrieval
performance. In this paper, we look at the performance
improvement for ad-hoc retrieval from a more integrated
point of view by combining the merits of both
techniques. In particular, we argue that the ranking
function should be tuned first, using user-provided
queries, before applying the blind feedback technique.
The intuition is that highly-tuned ranking offers more
high quality documents at the top of the hit list, thus
offers a stronger baseline for blind feedback. We
verify this integrated model in a large scale
heterogeneous collection and the experimental results
show that combining ranking function tuning and blind
feedback can improve search performance by almost 30
percent over the baseline Okapi system.",
notes = "http://www.sigir.org/sigir2004/
Also known as \cite{Fan:2004:TBF:1008992.1009018}",