39 research outputs found

    CLASSIFIERS BASED ON A NEW APPROACH TO ESTIMATE THE FISHER SUBSPACE AND THEIR APPLICATIONS

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    In this thesis we propose a novel classifier, and its extensions, based on a novel estimation of the Fisher Subspace. The proposed classifiers have been developed to deal with high dimensional and highly unbalanced datasets whose cardinality is low. The efficacy of the proposed techniques has been proved by the results achieved on real and synthetic datasets, and by the comparison with state of the art predictors

    On the experimental design of the material microstructures

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    The design techniques of the components on the macro level are established in the scientific community, however are far behind from the real material performance limits. To obtain those limits, the deeper understanding of the material structure is required. The methods of a new comonents production through standard alloying are the basis of the modern material science manufacturing. The design of the materials with expected required performance limits is the next conceptual step for the materials scientist. As results, to make this step, the problem of a precise material structure analyses on the microstructural level is one os the major importance for the next generation materials design. The complexity of the material structure across the scales(macro-micro) requires a new non deterministic methods for better understanding of the connectivity betwen a materials performance and material microstructure features. This work presents a various new research methodologies and techniques of the material microstructure characterization and numerical design with future applications to the anlyses of the material behavior. The focus of the particular research was to analyse a new cross correlation function of the material structure on the micro length scale and develop a novel framework which allows a better understanding of various important material phenomenas such as failure initiation and recrystallization

    Convergence across Kazakhstan regions.

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    The issue of regional economic disparities is important for the Republic of Kazakhstan, which is going through a transition period from a planned socialist system to a market-based economy. This presents a large number of problems for a government seeking to balance development in order to avoid problems of inequality and political unrest and, at present, there is a shortage of the type of information that would be useful to formulate policy. The main aim of this thesis is to help make up some of this gap. It does so by examining various types of convergence process across the regions of Kazakhstan over the period of 1993-2009. Since different types of convergence reflect different aspects of the problem, we use a variety of concepts and empirical approaches in studying convergence across Kazakhstan's regions. First, we approach convergence directly by studying the dynamics of standard deviation and coefficient of variation of per capita GRP level across Kazakhstan's regions, which is called -convergence. Next, we study absolute and conditional -convergence using cross-section and panel approaches. Afterwards, we study the club-convergence proposing an approach that consists of two stages: clustering of regions and testing convergence within clusters. In studying TFP convergence, we use panel unit root tests. In addition, we apply the method of sector decomposition to reveal economic sectors, which promote either convergence or divergence across the Kazakhstan regions. The results of this thesis show that, in general, regions of Kazakhstan diverged over the period of 1993-2009 in the sense of -convergence and absolute -convergence. However, they demonstrated convergence in other recognised forms of convergence (conditional -convergence, TFP-convergence, club-convergence) over various time spans within the 1993-2009 period. For the government this means that convergence in Kazakhstan is not per se a process that accompanies economic development and that a strong regional policy is needed. In order to reduce economic disparities and preserve high rates of economic growth this policy should be complicated, club-specific, and directed to the equalization of production structure of regions and targeting the sectors promoting convergence

    The Practical Science of Society

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    https://commons.und.edu/und-books/1107/thumbnail.jp

    Desarrollo de plataformas de an谩lisis orientado y global en metabol贸mica vegetal y cl铆nica en nutrimetabol贸mica

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    En la presente Memoria de Tesis se ha pretendido dise帽ar plataformas, tanto para an谩lisis metabol贸mico orientado como global, que tuvieran una manifiesta utilidad en Nutrimetabol贸mica y en Metabol贸mica cl铆nica, de forma que supusieran una contribuci贸n a la eliminaci贸n de las lagunas existentes en estas 谩reas de la Metabol贸mica, incrementando as铆 la posibilidad de resoluci贸n de problemas por ella misma o integrada con otras 贸micas (biolog铆a de sistemas). Con este prop贸sito, se desarrollaron tres m茅todos de multideterminaci贸n, como forma de obtenci贸n de datos globales de la fracci贸n insaponificable del olivo (en hojas y frutos) junto con su aplicaci贸n, recogidos en la Parte I. Seguidamente se desarrollaron cinco nuevos m茅todos que fueron aplicados en el 谩rea de la Nutrimetabol贸mica, con la finalidad de comprobar el efecto de la ingesti贸n por individuos obesos de distintos tipos de aceites de fritura en funci贸n de los antioxidantes empleados en su enriquecimiento, reunidos en la Parte II. Tras lo recogido en estas dos primeras partes se desarrollaron nuevas plataformas orientadas a la Metabol贸mica cl铆nica, en las que la automatizaci贸n y miniaturizaci贸n fuesen la clave para su aplicaci贸n al an谩lisis sistem谩tico con un consumo m铆nimo de muestra de distintos fluidos biol贸gicos. En la Parte IV, se dise帽aron y aplicaron plataformas globales con las que se obtuvieron el perfil metabol贸mico del plasma obtenido de individuos con s铆ndrome metab贸lico sometidos a una alimentaci贸n con contenido lip铆dico diferente en cantidad y en calidad. Por 煤ltimo en el Anexo se muestra la divulgaci贸n de esta investigaci贸n en congresos y reuniones cient铆ficas

    Estudio del rendimiento de arquitecturas basadas en grupos para WAHSN

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    [ES] Existen muchos trabajos relacionados con las redes ad hoc y las redes de sensores donde se presentan nuevos protocolos que encaminamiento que aportan mejores caracter铆sticas, otros trabajos donde se comparan para ver cual posee un mejor rendimiento 贸 incluso presentan nuevas aplicaciones basadas en este tipo de redes, pero este trabajo aporta otro punto de vista. 驴Por que no ver la red como un conjunto que se divide en grupos para aportar un mejor rendimiento a la red independientemente del protocolo de encaminamiento utilizado?. Para ello, en este trabajo, vamos a demostrar a trav茅s de simulaciones, que la agrupaci贸n de nodos en redes WAHSN (Wireless Ad Hoc & Sensor Networks) aporta mejoras a la red en general, disminuyendo el tr谩fico de encaminamiento, el retardo, el throughput, etc. Este estudio se ha realizado evaluando los protocolos est谩ndar m谩s utilizados (DSR [1], AODV [2] y OLSR [3]), as铆 podemos observar cual de ellos aporta un mejor rendimiento. Finalmente, se propone una arquitectura de red basada en grupos optimizada para las redes WAHSN[EN] There are many works related with ad hoc networks and sensor networks where the authors present new routing protocols with better or enhanced features, others just compare the performance of them or present an application environment, but this work tries to give another point of view. Why don驴t we see the network as a whole and split it intro groups to give better performance to the network regardless of the used routing protocol?. First, we will demonstrate, through simulations, that grouping nodes in WAHSN (Wireless Ad Hoc & Sensor Networks) improves the whole network by diminishing the routing traffic, the delay, the throughput, etc. This study was conducted to assess the most used standard protocols (DSR [1], AODV [2] and OLSR [3]) that gives better performance to the whole network when there are groups of nodes. Finally, a group-based network architecture optimized for WAHSN is proposedGarc铆a Pineda, M. (2008). Estudio del rendimiento de arquitecturas basadas en grupos para WAHSN. http://hdl.handle.net/10251/13472Archivo delegad

    Optimisation of nonlinear photonic devices: design of optical fibre spectra and plasmonic systems

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    El prop贸sito de esta tesis es dise帽ar y optimizar dispositivos fot贸nicos en el r茅gimen no lineal. En particular, se han elegido dos tipos de dispositivos, que se clasifican seg煤n los fen贸menos f铆sicos de inter茅s. La primera clase corresponde a fibras convencionales o de cristal fot贸nico, dise帽adas para que la din谩mica temporal de los paquetes de onda que se propagan en su interior genere espectros con las caracter铆sticas deseadas, en el contexto del supercontinuo. La segunda clase explota la fenomenolog铆a espacial asociada a las ondas electromagn茅ticas que se propagan sobre la superficie de un metal. Estas ondas permiten, desde dise帽ar dispositivos tipo chip fot贸nico cuyas dimensiones t铆picas est谩n muy por debajo de la longitud de onda de la luz, hasta la generaci贸n de estados no lineales h铆bridos de din谩mica singular. Todos estos efectos tienen lugar dentro del marco proporcionado por las ecuaciones de Maxwell macrosc贸picas, las cuales han sido resueltas num茅ricamente. En algunos casos se emplean grandes aproximaciones te贸ricas para estudiar sistemas 1D, mientras que en otros se integran directamente en 3D. En el caso en el que la optimizaci贸n del dispositivo resulta no trivial tras haber adquirido un conocimiento te贸rico profundo del mismo, se emplea una novedosa herramienta num茅rica que nace de la combinaci贸n de algoritmos gen茅ticos con plataforma Grid.Mili谩n Enrique, C. (2012). Optimisation of nonlinear photonic devices: design of optical fibre spectra and plasmonic systems [Tesis doctoral no publicada]. Universitat Polit猫cnica de Val猫ncia. https://doi.org/10.4995/Thesis/10251/14670Palanci
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