Switching-Cell Arrays - An Alternative Design Approach in Power Conversion

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other worksThe conventional design of voltage-source power converters is based on a two-level half-bridge configuration and the selection of power devices designed to meet the full application specifications (voltage, current, etc.). This leads to the need to design and optimize a large number of different devices and their ancillary circuitry and prevents taking advantage from scale economies. This paper proposes a paradigm shift in the design of power converters through the use of a novel configurable device consisting on a matrix arrangement of highly-optimized switching cells at a single voltage class. Each switching cell consists of a controlled switch with antiparallel diode together with a self-powered gate driver. By properly interconnecting the switching cells, the switching cell array (SCA) can be configured as a multilevel active-clamped leg with different number of levels. Thus, the SCA presents adjustable voltage and current ratings, according to the selected configuration. For maximum compactness, the SCA can be conceived to be only configurable by the device manufacturer upon the customer needs. For minimum cost, it can also be conceived to be configurable by the customer, leading to field-configurable SCAs. Experimental results of a 6x3 field-configurable SCA are provided to illustrate and validate this design approach.Peer ReviewedPostprint (author's final draft

A Transformation-based Implementation for CLP with Qualification and Proximity

Uncertainty in logic programming has been widely investigated in the last decades, leading to multiple extensions of the classical LP paradigm. However, few of these are designed as extensions of the well-established and powerful CLP scheme for Constraint Logic Programming. In a previous work we have proposed the SQCLP (proximity-based qualified constraint logic programming) scheme as a quite expressive extension of CLP with support for qualification values and proximity relations as generalizations of uncertainty values and similarity relations, respectively. In this paper we provide a transformation technique for transforming SQCLP programs and goals into semantically equivalent CLP programs and goals, and a practical Prolog-based implementation of some particularly useful instances of the SQCLP scheme. We also illustrate, by showing some simple-and working-examples, how the prototype can be effectively used as a tool for solving problems where qualification values and proximity relations play a key role. Intended use of SQCLP includes flexible information retrieval applications.Comment: 49 pages, 5 figures, 1 table, preliminary version of an article of the same title, published as Technical Report SIC-4-10, Universidad Complutense, Departamento de Sistemas Inform\'aticos y Computaci\'on, Madrid, Spai

Dominance Measuring Approach using Stochastic Weights

In this paper we propose an approach to obtain a ranking of alternatives in multicriteria decision-making problems when there is imprecision concerning the alternative performances, component utility functions and weights. We assume decision maker's preferences are represented by an additive multi-attribute utility function, in which weights are modeled by independent normal variables, the performance in each attribute for each alternative is an interval value and classes of utility functions are available for each attribute. The approach we propose is based on dominance measures, which are computed in a similar way that when the imprecision concerning weights is modeled by uniform distributions or by an ordinal relation. In this paper we will show how the approach can be applied when the imprecision concerning weights are represented by normal distributions. Extensions to other distributions, such as truncated normal or beta, can be feasible using Monte Carlo simulation techniques

Organización docente del programa de enseñanzas regladas en lengua inglesa en la EUEE de la Universidad de Sevilla

Una vez conocidos los objetivos que llevaron a la EUEE a implantar su programa de enseñanzas regladas en lengua inglesa, así como las líneas generales del proceso conducente a su implantación, en el presente capítulo abordamos los muchos y variados aspectos de la organización docente del programa, los cuales han quedado agrupados en cuatro apartados principales: tamaño y número de los grupos; la acreditación del nivel de inglés de profesores y alumnos; el proceso de formalización de matrículas para alumnos de nuevo ingreso y para aquéllos que ya están inmersos en el programa, así como el reconocimiento de la actividad en el expediente académico; y, finalmente, aspectos concretos de la organización de las enseñanzas: guías y programas de las asignaturas, bibliografía y textos específicos, clases, tutorías y otras actividades docentes, y exámenes y evaluaciones

Objetivos y acuerdo de implantación del programa de enseñanzas regladas en lengua inglesa en la EUEE de la Universidad de Sevilla

El presente capítulo pretender abordar el planteamiento inicial de la Dirección de la Escuela Universitaria de Estudios Empresariales con objeto de implantar una enseñanza en lengua inglesa en la Diplomatura de Ciencias Empresariales. Asimismo, la introducción de los nuevos Grados en Finanzas y Contabilidad y en Turismo ha propiciado que el planteamiento y la experiencia se extiendan, también, a estas titulaciones. El apoyo del Rectorado de la Universidad de Sevilla a la docencia en inglés mediante el I Plan de Docencia posibilita y hace más atractiva la propuesta de la EUEE al profesorado

Evaluación del crecimiento celular y consumo de sustrato a partir del establecimiento de suspensiones celulares de Borojoa patinoi cuatrec

El Borojoa patinoi cuatrec es una planta originaria del departamento del Chocó. Es ampliamente reconocida por sus propiedades medicinales y nutricionales debido a su contenido de aminoácidos esenciales y fósforo, así como sus metabolitos secundarios: triterpenos (sesquiterpenos), taninos, fenoles y antraquinonas. En este estudio se evaluó el efecto de la luz (presencia y ausencia) y la hormona 2,4-D (0 y 1 mg/L) para el establecimiento de suspensiones celulares de B. patinoi, observando su crecimiento celular, la producción de proteínas extracelulares y producción de azucares.98 p.Contenido parcial: Generalidades del borojó -- Descripción botánica -- Fruto -- Taninos -- Antraquinonas -- Flavonoides – Sesquiterpenos -- Suspensiones celulares -- Cultivo de tejidos

Ranking Alternatives on the Basis of a Dominance Intensity Measure

The additive multi-attribute utility model is widely used within MultiAttribute Utility Theory (MAUT), demanding all the information describing the decision-making situation. However, these information requirements can obviously be far too strict in many practical situations. Consequently, incomplete information about input parameters has been incorporated into the decisionmaking process. We propose an approach based on a dominance intensity measure to deal with such situations. The approach is based on the dominance values between pairs of alternatives that can be computed by linear programming. These dominance values are transformed into dominance intensities from which a dominance intensity measure is derived. It is used to analyze the robustness of a ranking of technologies for the disposition of surplus weapons-grade plutonium by the Department of Energy in the USA, and compared with other dominance measuring methods