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Madrid, Spain

Archambault D.,University College Dublin | Daly E.M.,IBM | Di Lorenzo G.,IBM | De Rijke M.,University of Amsterdam | And 7 more authors.
AI Magazine | Year: 2013

The workshops day at the Sixth International Conference on Weblogs and Social Media included three full-day workshops (Real-Time Analysis and Mining of Social Streams, Social Media Visualization, and When the City Meets the Citizen) and one half-day workshop (The Potential of Social Media Tools and Data for Journalists in the News Media Industry). Workshops were held on June 4, 2012, the day prior to the first day of the technical conference, in Dublin, Ireland. Copyright © 2013, Association for the Advancement of Artificial Intelligence.

Cabaleiro B.,NLP and IR Group at UNED | Penas A.,NLP and IR Group at UNED
Knowledge-Based Systems | Year: 2015

Parsing mistakes impose an upper bound in performance on many information extraction systems. In particular, syntactic errors detecting appositive structures limit the system's ability to capture class-instance relations automatically from texts. The article presents a method that considers semantic information to correct appositive structures given by a parser.First, we build automatically a background knowledge base from a reference collection, capturing evidence of semantic compatibility among classes and instances. Then, we evaluate three different probabilistic-based measures to identify the correct dependence on ambiguous appositive structures.Results reach a 91.4% of correct appositions which is a relative improvement of 12.9% with respect to the best baseline (80.9%) given by a state of the art parser. © 2015 Elsevier B.V.

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