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Integrating multiple windows and document features for expert finding

Zhu, Jianhan; Song, Dawei and Rüger, Stefan (2009). Integrating multiple windows and document features for expert finding. Journal of the American Society for Information Science and Technology, 60(4) pp. 694–715.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1002/asi.21012
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Abstract

Expert finding is a key task in enterprise search and has recently attracted lots of attention from both research and industry communities. Given a search topic, a prominent existing approach is to apply some information retrieval (IR) system to retrieve top ranking documents, which will then be used to derive associations between experts and the search topic based on cooccurrences. However, we argue that expert finding is more sensitive to multiple levels of associations and document features that current expert finding systems insufficiently address, including (a) multiple levels of associations between experts and search topics, (b) document internal structure, and (c) document authority. We propose a novel approach that integrates the above-mentioned three aspects as well as a query expansion technique in a two-stage model for expert finding. A systematic evaluation is conducted on TREC collections to test the performance of our approach as well as the effects of multiple windows, document features, and query expansion. These experimental results show that query expansion can dramatically improve expert finding performance with statistical significance. For three well-known IR models with or without query expansion, document internal structures help improve a single window-based approach but without statistical significance, while our novel multiple window-based approach can significantly improve the performance of a single window-based approach both with and without document internal structures.

Item Type: Journal Article
Copyright Holders: 2009 American Society for Information Science and Technology
ISSN: 1532-2882
Extra Information: This is a preprint of an article accepted for publication in Journal of the American Society for Information Science and Technology. This preprint has been updated to reflect changes in the final version.
Academic Unit/Department: Knowledge Media Institute
Mathematics, Computing and Technology > Computing & Communications
Item ID: 25877
Depositing User: Kay Dave
Date Deposited: 04 Jan 2011 13:03
Last Modified: 24 Oct 2012 16:24
URI: http://oro.open.ac.uk/id/eprint/25877
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