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This paper presents an approach for knowledge discovery in texts extracted from the Web. Instead of analyzing words or attribute values, the approach is based on concepts, which are extracted from texts to be used as characteristics in the mining process. Statistical techniques are applied on concepts in order to find interesting patterns in concept(More)
This paper presents a context-aware text summarizer based on ontologies intended to be used for adapting information to mobile devices. The system generates summaries from texts according to the profile of the user and the context where he/she is at the moment. Context is determined by spatial and temporal localization. Ontologies are used to allow(More)
This paper describes the Personal Tour recommender system that helps customers to find best travel packages according to their preferences. Personal Tour is based on the paradigm of the Distributed Artificial Intelligence and a customer recommendation request is divided into partial recommendations that are handled by different agents. Experiments were run(More)
This work presents a recommender system that helps travel agents in discovering options for customers, especially those who do not know where to go and what to do. The system analyzes textual messages exchanged between a travel agent and a customer through a private Web chat. Text mining techniques help discover interesting areas in the messages. After(More)
This paper presents an approach that identifies Location Indicators related to geographical locations, by analyzing texts of news published in the Web. The goal is to semi-automatically create Gazetteers with the identified relations and then perform geo-referencing of news. Location Indicators include non-geographical entities that are dynamic and may(More)
INTRODUCTION This study retrospectively evaluated CT-guided thoracic biopsies for diagnostic yield, accuracy and complications. MATERIALS AND METHODS A retrospective analysis of 384 patients (mean age 62.7 years; male/female = 251/133) who underwent 399 CT-guided thoracic biopsies were performed for evaluating diagnostic yield, accuracy and complications.(More)
Acute cholecystitis (AC) is an important cause of emergency admissions among the elderly. The use of percutaneous cholecystostomy (PC) as bridging therapy among high-risk patients is widely accepted. However, the use of PC as definitive treatment is controversial. To determine the characteristics, clinical outcomes and predictors of recurrence of AC among(More)
This paper presents a Text Mining approach for discovering knowledge in texts to later construct decision support systems. Text mining can take advantage of knowledge stored in textual documents, reducing the effort for knowledge acquisition. The approach consists in performing a mining process on concepts present in texts instead of working with words. The(More)
This paper presents how text -mining techniques can be used to analyze an enterprise’s external environment searching for competitors, related products and services, marketing strategies and customers’ opinions. A case study, using the UNCTAD Electronic Trading Opportunities (ETO) System, is presented. The ETO system enables “Trade Points” and trade-related(More)
This work presents a strategy to identify interest/expertise areas of professionals from analyzing their curricula vitae. A text mining technique is used to analyze the texts in the curricula and compare keywords to concepts defined in a domain ontology. The paper shows how the structure of the curriculum may be used for that purpose. The main application(More)