Luis Alfonso Ureña López

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Sentiment analysis is a challenging new task related to text mining and natural language processing. Although there are, at present, several studies related to this theme, most of these focus mainly on English texts. The resources available for opinion mining (OM) in other languages are still limited. In this article, we present a new Arabic corpus for the(More)
Searching biomedical information in a large collection of medical data is a complex task. The use of tools and biomedical resources could ease the retrieval of the information desired. In this paper, we use the medical ontology MeSH to improve a Multimodal Information Retrieval System by expanding the user's query with medical terms. In order to accomplish(More)
0957-4174/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.eswa.2011.05.070 ⇑ Corresponding author. Tel.: +34 953 212898; fax: E-mail address: (M. Rushdi Saleh 1 2 3 Recently, opinion mining is receiving more attention due to the abundance of forums, blogs, e-commerce(More)
This paper presents our first participation in the bilingual English-Spanish track at CLEF QA 2006. The Multilingual BRUJA system is presented, a Question Answering (QA) system that works with questions in several languages and also collections in several languages. The BRUJA system is currently in its first phase of develop, so we have only run one(More)
Recently, Opinion Mining (OM) is receiving more attention due to the abundance of forums, blogs, ecommerce web sites, news reports and additional web sources where people tend to express their opinions. There are a number of works about Sentiment Analysis (SA) studying the task of identifying the polarity, whether the opinion expressed in a text is positive(More)
This paper presents a novel approach in Sentiment Polarity Detection on Twitter posts, by extracting a vector of weighted nodes from the graph of WordNet. These weights are used on SentiWordNet to compute a final estimation of the polarity. Therefore, the method proposes a non-supervised solution that is domain-independent. The evaluation over a generated(More)