The performance of an Information Retrieval System (IRS) is closely related to the query. The queries that lead to retrieval failure are referenced in the literature as "difficult queries". This study aims at analysing, adapting and combining several difficulty predictors. The evaluation of the prediction is based on the correlation between the predicted difficulty and the IRS performance. As p...

This paper describes a modeling in a logical framework of the semantic content of a class of action nouns in French that are ambiguous between a processive interpretation and a resultative one in which these nouns refer to new objects in the world that are created by the process artefacts. The first part of the paper is about an explanation of the properties that show why these ambiguous action...