Automatic phrase indexing for document retrieval
SIGIR '87 Proceedings of the 10th annual international ACM SIGIR conference on Research and development in information retrieval
Viewing morphology as an inference process
SIGIR '93 Proceedings of the 16th annual international ACM SIGIR conference on Research and development in information retrieval
Question-answering by predictive annotation
SIGIR '00 Proceedings of the 23rd annual international ACM SIGIR conference on Research and development in information retrieval
Monolingual Document Retrieval for European Languages
Information Retrieval
Fast statistical parsing of noun phrases for document indexing
ANLC '97 Proceedings of the fifth conference on Applied natural language processing
Information extraction for question answering: improving recall through syntactic patterns
COLING '04 Proceedings of the 20th international conference on Computational Linguistics
CLEF'04 Proceedings of the 5th conference on Cross-Language Evaluation Forum: multilingual Information Access for Text, Speech and Images
Semantic search via XML fragments: a high-precision approach to IR
SIGIR '06 Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval
Proceedings of the sixteenth ACM conference on Conference on information and knowledge management
Genetic algorithms for data-driven web question answering
Evolutionary Computation
Biased LexRank: Passage retrieval using random walks with question-based priors
Information Processing and Management: an International Journal
Linguistic knowledge and question answering
KRAQ '06 Proceedings of the Workshop KRAQ'06 on Knowledge and Reasoning for Language Processing
Statistical source expansion for question answering
Proceedings of the 20th ACM international conference on Information and knowledge management
Question answering for dutch using dependency relations
CLEF'05 Proceedings of the 6th international conference on Cross-Language Evalution Forum: accessing Multilingual Information Repositories
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In this paper we investigate the use of linguistic knowledge in passage retrieval as part of an open-domain question answering system. We use annotation produced by a deep syntactic dependency parser for Dutch, Alpino, to extract various kinds of linguistic features and syntactic units to be included in a multi-layer index. Similar annotation is produced for natural language questions to be answered by the system. From this we extract query terms to be sent to the enriched retrieval index. We use a genetic algorithm to optimize the selection of features and syntactic units to be included in a query. This algorithm is also used to optimize further parameters such as keyword weights. The system is trained on questions from the competition on Dutch question answering within the Cross-Language Evaluation Forum (CLEF). We could show an improvement of about 15% in mean total reciprocal rank compared to traditional information retrieval using plain text keywords (including stemming and stop word removal).