The Social Book Search (SBS) lab at CLEF 2016 provides a complex test collection that gives the opportunity to experiment with retrieval methods that combine various modalities in order to achieve the best possible ranked list. We show how the idea of being ”characteristic”, which is used as the core concept in most of the weighting schemes used for textual modalities, can be applied to non-tex...

The Okapi system has been used in a series of experiments on the TREC collections, investigating probabilistic models, relevance feedback and query expansion, and interaction issues. The TREC-6 ad hoc task was used to test an application of a new relevance weighting formula, which takes account of documents judged nonrelevant. The application was to a form of blind feedback (using the top-ranke...

In TREC-10, Microsoft Research Asia (MSRA) participated in the Web track (ad hoc retrieval task and homepage finding task). The latest version of the Okapi system (Windows 2000 version) was used. We focused on the developing of content-based retrieval and linkbased retrieval, and investigated the suitable combination of the two. For content-based retrieval, we examined the problems of weighting...

We describe and analyze our participation in the WikipediaMM task at ImageCLEF 2010. Our approach is based on text-based image retrieval using information retrieval techniques on the metadata documents of the images. We submitted two English monolingual runs and one multilingual run. The monolingual runs used the query to retrieve the metadata document with the query and document in the same la...

The third participation of the University of Hagen at the German Indexing and Retrieval Test (GIRT) task of the Cross Language Evaluation Campaign (CLEF 2005) aims at providing a better baseline for experiments with natural language processing (NLP) methods in domainspecific information retrieval (IR). Our monolingual experiments with the German document collection are based on a setup combinin...

participated in both the classification and ad hoc retrieval tasks of the TREC 2005 Genomics Track. To better understand the text classification techniques that lead to improved performance, we applied a set of general purpose biomedical document classification systems to the four triage tasks, varying one system feature or text processing technique at a time. We found that our best and most co...

to estimate plant resistance to cadmium chloride (cdcl2) stress for phytoremediation purposes, the effect of cadmium (cd) phytotoxicity was assessed on total soluble protein, chlorophyll (chl) content and antioxidant enzymes in the leaves of three different brassica napus (b. napus) cultivars; mohican, reg.cob and okapi. plants were exposed to three levels of cdcl2 (0.75, 1.5 and 2.25 mm) in ir...

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