%0 Journal Article
%T USFD2: Annotating Temporal Expresions and TLINKs for TempEval-2
%A Leon Derczynski
%A Robert Gaizauskas
%J Computer Science
%D 2012
%I arXiv
%X We describe the University of Sheffield system used in the TempEval-2 challenge, USFD2. The challenge requires the automatic identification of temporal entities and relations in text. USFD2 identifies and anchors temporal expressions, and also attempts two of the four temporal relation assignment tasks. A rule-based system picks out and anchors temporal expressions, and a maximum entropy classifier assigns temporal link labels, based on features that include descriptions of associated temporal signal words. USFD2 identified temporal expressions successfully, and correctly classified their type in 90% of cases. Determining the relation between an event and time expression in the same sentence was performed at 63% accuracy, the second highest score in this part of the challenge.
%U http://arxiv.org/abs/1203.5060v1