Ana Laura Lezama Sánchez

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Resumen. En el presente trabajo se propone una aproximación que utiliza la expansión de consultas en un Sistema de Recuperación de Información Booleano (SRIB), con la finalidad de mejorar el nivel de precisión de un SRIB sin expansión. Las consultas están formadas por los conceptos y relaciones existentes en ontoloǵıas de dominio. El SRIB sin expansión y(More)
In this research work we propose two approaches for query expansion aiming to improve the performance of a Boolean Information Retrieval System (BIRS). Queries are made up of words and integrate the concepts and semantic relationships retrieved from four ontologies of restricted domain. The final purpose is to retrieve relevant information from the domain(More)
The synthesis and characterization of the precursor isomers trans-4-(2-(pyridin-2-yl)vinylbenzaldehyde (I), trans-4-(2-(pyridin-4-yl)vinylbenzaldehyde (II), trans-4-(2-(pyridin-2-yl)vinylbenzoic acid (III) and (E)-4-(2-(pydridin-4-yl)vinylbenzoic acid (IV) are reported. These compounds were prepared in order to obtain(More)
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