Peter-Arno Coppen

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While developing an approach towhy-QA, we extended a passage retrieval system that uses offthe-shelf retrieval technology with a re-ranking step incorporating structural information. We get significantly higher scores in terms of MRR@150 (from 0.25 to 0.34) and success@10. The 23% improvement that we reach in terms of MRR is comparable to the improvement(More)
In this paper, we extend an existing paragraph retrieval approach to why-question answering. The starting-point is a system that retrieves a relevant answer for 73% of the test questions. However, in 41% of these cases, the highest ranked relevant answer is not ranked in the top-10. We aim to improve the ranking by adding a reranking module. For re-ranking(More)
Our research aims at developing a system for answering why-questions (why-QA). More specifically, we focus on the role that linguistic information and analysis can play in the process of why-QA. In the present paper, we evaluate an answer extraction method that exploits discourse relations in texts. In approaches to factoid QA, named entity recognition can(More)
For research and development of an approach for automatically answering why-questions (why-QA) a data collection was created. The data set was obtained by way of elicitation and comprises a total of 395 why-questions. For each question, the data set includes the source document and one or two user-formulated answers. In addition, for a subset of the(More)
1. The efficacy of the AvGard Trisodium Phosphate (TSP) immersion carcase wash process was evaluated during 5 industrial trials against Salmonella, Enterobacteriaceae, thermotolerant coliforms and total aerobic count. The effect against Pseudomonas was also studied in the first 3 trials. 2. Dramatic reductions in Salmonella incidence were seen using a whole(More)
1. The efficiency of the AvGard (or Assur-Rince in the USA) trisodium phosphate poultry carcase decontamination process was evaluated during both manual and industrial trials against total aerobic mesophilic count (TAMC), thermotolerant coliforms, Pseudomonas, Enterobacteriaceae, Campylobacter, Listeria monocytogenes and Salmonella. 2. The TSP treatment(More)
An intonational domain corresponds to the part of an utterance spanned by one intonation contour. We lay out a theory of intonational domains that is rooted in intonational (autosegmental) phonology and prosodic phonology. We focus on restructuring—the process that joins two intonational domains together to form a single domain. We report on a perception(More)
In the current project, we aim at developing an approach for automatically answering whyquestions (why-QA). In the present paper, we investigate the relevance of linguistic analysis for why-QA. We focus on two tasks: the use of syntactic information for answer type determination and the use of discourse structure for the extraction of possible answers from(More)