Information retrieval Archives - Page 6 of 6

Integrating Conceptual Knowledge into Relevance Models: A Model and Estimation Method

13/10/2007 Conference Papers Publications No Comments

We address the issue of combining explicit background knowledge with pseudo-relevance feedback from within a document collection. To this end, we use document-level annotations in tandem with generative language models to generate terms from pseudo-relevant documents and bias the probability estimates of expansion terms in a principled manner. By applying…

Thesaurus-Based Feedback to Support Mixed Search and Browsing Environments

13/09/2007 Conference Papers Publications No Comments

We propose and evaluate a query expansion mechanism that supports searching and browsing in collections of annotated documents. Based on generative language models, our feedback mechanism uses document-level annotations to bias the generation of expansion terms and to generate browsing suggestions in the form of concepts selected from a controlled…

My first BioAID: heuristic support for hypothesis construction from literature

13/04/2007 Conference Papers Publications No Comments

Motivation Constructing a new hypothesis is often the first step for a new cycle of experiments. A typical approach to harvesting biological literature is to scan the results of a PubMed query and read what we think is most relevant. In this scenario, we are limited by the selection of…

Language Models for Enterprise Search: Query Expansion and Combination of Evidence

12/01/2007 Publications Unrefereed No Comments

We describe our participation in the TREC 2006 Enterprise track. We provide a detailed account of the ideas underlying our language modeling approaches to both the discussion search and expert search tasks. For discussion search, our focus was on query expansion techniques, using additional information from the topic statement and…

Expanding Queries Using Multiple Resources

12/01/2007 Publications Unrefereed No Comments

We describe our participation in the TREC 2006 Genomics track, in which our main focus was on query expansion. We hypothesized that applying query expansion techniques would help us both to identify and retrieve synonymous terms, and to cope with ambiguity. To this end, we developed several collection-specific as well…

Deploying Lucene on the Grid

01/07/2006 Publications Workshop Papers No Comments

We investigate if and how open source retrieval engines can be deployed in a grid environment. When comparing grids to conventional distributed IR, the lack of a-priori knowledge about available nodes is one of the most significant differences. On top of that, it is also unknown when a particular node…

Combining Thesauri-based Methods for Biomedical Retrieval

12/01/2006 Publications Unrefereed No Comments

This paper describes our participation in the TREC 2005 Genomics track. We took part in the ad hoc retrieval task and aimed at integrating thesauri in the retrieval model. We developed three thesauri-based methods, two of which made use of the existing MeSH thesaurus. One method uses blind relevance feedback…

Van Case-Based Reasoning tot Information Retrieval; Case retrieval voor de helpdesk van een webhosting bedrijf

01/09/2005 Publications Theses No Comments

The helpdesk department of Hostnet, a web hosting company, daily receives 35 up to 50 questions from its customers. Within the domain in which Hostnet operates, only few off-the-shelf manuals exist and this is particularly noticeable on the helpdesk. Currently, only a few possibilities for knowledge management and/or elicitation exist…

Edgar Meij

Tag: Information retrieval