Alejandro Ruiz Figueroa

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Any scientific or technical document is organized hierarchically: some sections of the text (such as the abstract or conclusions) summarize the contents of the main text; sections have titles describing their contents in general words; chapter titles describe the contents of a set of sections; book title describes the contexts of all chapters, etc.(More)
We propose a method for semi-automatic construction of an ontol-ogy of a given branch of science for measuring its evolution in time. The method relies on a collection of documents in the given thematic domain. We observe that the words of different levels of abstraction are located within different parts of a document: say, the title or abstract contains(More)
PREFACE This ICML-2005 workshop on ontology learning stands in the tradition of the ECML/PKDD 2004 workshop on Knowledge Discovery and Ontologies and precedes the ECML/PKDD 2005 workshop on the same topic. Unlike these workshops, which focus on the application of different ontology types in various domains, this workshop focuses on the acquisition of(More)
Fish, benthic macroinvertebrate, and plant responses to 30-day exposures of C14-15 linear alcohol ethoxylate surfactant with an average of 7 mol of ethylene oxide (LAE) were measured in flowthrough stream mesocosms. Replicate stream mesocosms were treated in two experiments with concentrations of LAE ranging from 80 to 550 microg/liter. Macroinvertebrates(More)
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