Ramón Alberto Carrasco

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—While various articles about fuzzy entity relationship (ER) and enhanced entity relationship (EER) models have recently been published, not all examine how the constraints expressed in the model may be relaxed. In this paper, our aim is to relax the constraints which can be expressed in a conceptual model using the modeling tool, so that these constraints(More)
This paper proposes a Genetic Algorithm for jointly performing a feature selection and granularity learning for Fuzzy Rule-Based Classification Systems in the scenario of highly imbalanced data-sets. We refer to imbalanced data-sets when the class distribution is not uniform, a situation that it is present in many real application areas. The aim of this(More)
At present, we have proceeded to extend SQL into a new language called dmFSQL (data mining Fuzzy Structured Query Language) which can be used to solve real problems of Data Mining. In this paper, we present an architecture that permits us to use this language dmFSQL for Oracle© Database. This enables us to evaluate the process of Data Mining at both a(More)
Soaring is a recreational activity and competitive sport where individuals fly un-powered aircrafts known as gliders. Soaring place selection process depends on a number of factors, resulting in a complex decision-making task. In this paper, we propose the use of the dmFSQL language for fuzzy queries as one of the techniques of Data Mining, which can be(More)
This paper studies how fuzzy quantifiers may be defined and implemented in a fuzzy database context. Fuzzy quantifiers are very useful for fuzzy queries, fuzzy constraints and fuzzy data mining applications. Besides, this paper shows different kind of fuzzy quantifiers with and without arguments. Finally, we show how fuzzy dependencies may use these fuzzy(More)
In this paper we present the problem of aggregating heterogeneous data from various websites with opinions about high end hotels into a database. We present the fuzzy model based on the semantic translation as a tool to obtain a linguistic summarization. The characteristics of this model (necessary to solve the problem) are not together on any of the(More)