Examinando por Materia "Rough Sets"

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    Dealing with Missing Data using a Selection Algorithm on Rough Sets
    (ATLANTIS PRESS, 2018-01-01) Prieto-Cubides, J; Argoty, C; Prieto-Cubides, J; Argoty, C; Universidad EAFIT. Departamento de Ciencias; Lógica y Computación
    This paper discusses the so-called missing data problem, i.e. the problem of imputing missing values in information systems. A new algorithm, called the ARSI algorithm, is proposed to address the imputation problem of missing values on categorical databases using the framework of rough set theory. This algorithm can be seen as a refinement of the ROUSTIDA algorithm and combines the approach of a generalized non-symmetric similarity relation with a generalized discernibility matrix to predict the missing values on incomplete information systems. Computational experiments show that the proposed algorithm is as efficient and competitive as other imputation algorithms.
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    Two-dimensional solution and analysis of a cylindrical matrix device with a circular release area
    (TAYLOR & FRANCIS INC, 2013-01-01) Simon L.; Ospina J.; Simon L.; Ospina J.; Universidad EAFIT. Departamento de Ciencias; Lógica y Computación
    A cylindrical device was analyzed using a Laplace transform-based method. The two-dimensional model represented a pharmaceutical agent uniformly distributed in a polymeric matrix surrounded by an impermeable layer. Molecules could be transferred only through a small hole centered at the top surface of the cylinder. A closed-form solution was obtained to help study the effects of design parameters and geometries on the cumulative amount of drug released. The latter variable increased with the mass transfer and diffusion coefficients and decreased with any increment in the device's length. The delivery rate was described by an effective time constant calculated from Laplace transforms. Reducing the orifice diameter or fabricating a longer system would delay transport of the medication. Simplified expressions for the release profile and the time constant were derived for special design cases. © 2013 Copyright Taylor and Francis Group, LLC.