For this week, I read A Unified Model of Phrasal and Sentential Evidence for Information Extraction; Authors: Siddharth Patwardhan and Ellen Riloff. The primary objective of the research is to use sentential context, along with phrasal context to identify entities that fill a particular role. The authors focus on NP extraction. They use a joint event probability of whether the entity occurs in a sentence that discusses an event, and does it satisfy a particular role. Although the authors use classifier based approaches to determine the latter probability, they acknowledge that pattern based approaches can also be used.
The authors claim that one of the significant contributions of the paper is classifying a sentence as an event sentence. For this, the main problem is generation of a corpus.