4,761 research outputs found

    Decomposition in bunches of the critical locus of a quasi-ordinary map

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    A polar hypersurface P of a complex analytic hypersurface germ, f=0, can be investigated by analyzing the invariance of certain Newton polyhedra associated to the image of P, with respect to suitable coordinates, by certain morphisms appropriately associated to f. We develop this general principle of Teissier (see Varietes polaires. I. Invariants polaires des singularites d'hypersurfaces, Invent. Math. 40 (1977), 3, 267-292) when f=0 is a quasi-ordinary hypersurface germ and P is the polar hypersurface associated to any quasi-ordinary projection of f=0. We build a decomposition of P in bunches of branches which characterizes the embedded topological type of the irreducible components of f=0. This decomposition is characterized also by some properties of the strict transform of P by the toric embedded resolution of f=0 given by the second author in a paper which will appear in Annal. Inst. Fourier (Grenoble). In the plane curve case this result provides a simple algebraic proof of the main theorem of Le, Michel and Weber in "Sur le comportement des polaires associees aux germes de courbes planes", Compositio Math, 72, (1989), 1, 87-113

    An Analysis of Next Generation Access Networks Deployment in rural areas

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    Next generation access networks (NGAN) will support a renewed electronic communication market where main opportunities lie in the provision of ubiquitous broadband connectivity, applications and content. From their deployment it is expected a wealth of innovations. Within this framework, the project reviews the variety of NGAN deployment options available for rural environments, derives a simple method for approximate cost calculations, and then discusses and compares the results obtained. Data for Spain are used for practical calculations, but the model is applicable with minor modifications to most of the rural areas of European countries. The final part of the paper is devoted to review the techno-economic implications of a network deployment in a rural environment as well as the adequacy and possible developments of the regulatory framework involve

    Volition versus feasibility: state aid when aid is looked upon favourably: the broadband example

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    The European Commission published on September 30, 2009, Guidelines for the application of State aid rules in relation to rapid deployment of broadband networks. These Guidelines are applicable to two markets that are connected, although somewhat different. In “traditional” or “first generation” broadband networks, public intervention mainly relates to rural communities or areas which are economically underdeveloped. Therefore, a corrective nature of the aid is maintained. However, the Guidelines are also applied to accelerate the deployment of next-generation access (NGA) networks, which implies a driving conception of State aid, as this is an emerging market and there are relatively few Europeans who have access to these networks. The analysis of these Guidelines thus seems relevant due to its novelty and, particularly, to the results that it can bring

    Información personal: la nueva moneda de la economía digital

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    Technological progress has profoundly changed the way personal data are collected, accessed and used. Those data make possible unprecedented customization of advertising which, in turn, is the business model adopted by many of the most successful Internet companies. Yet measuring the value being generated is still a complex task. This paper presents a review of the literature on this subject. It has been found that the economic analysis of personal information has been conducted up to now from a qualitative perspective mainly linked to privacy issues. A better understanding of a quantitative approach to this topic is urgently needed

    Jeux sur mobile: les développeurs et le rôle des plates-formes de logiciels

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    Les jeux sur mobile sont un exemple majeur à la fois d'une application réussie sur les mobiles et du nombre croissant de plates-formes pour les médias et les industries de loisirs. Explorant cette convergence, l'article analyse les caractéristiques principales du marché des jeux sur mobile et de son écosystème industriel, ses activités et acteurs principaux. L'article se concentre sur le rôle des différentes plates-formes de logiciels et sur les défis et opportunités futures pour les développeurs de jeux sur mobile dans un nouveau scénario dominé par les plates-formes de mobile

    Are Central and Eastern European Countries managing to develop the information Society?

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    Taking the advantage of the opportunities offered by the advent of the information society is more and more often acknowledged as a sure path for future economic development. Moreover, this could be the only way for those countries with narrow domestic markets or limited physical resources. Many of the CEECs started at an early time the design and progressive putting into practice of programmes intended to adapt their societies and economies to the information society. This article reviews the evolution of these public policies, assesses the impact of the plans (using the most solid indicators published on the development of the information society) and, based on the results obtained, presents some critical analysis

    Asymmetries and shortages of the network neutrality principle: What could neutrality achieve?

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    The debate on network neutrality has reached sufficient notoriety to eliminate the need for detailed explanation. A simple definition will suffice: “network neutrality” is understood as the principle by which the owners of broadband networks would not be allowed to establish any type of discrimination or preference over the traffic transmitted through the

    Consumo de perfumes en la Facultad de Economía, Empresa y Turismo

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    El objetivo principal de este trabajo es caracterizar el servicio de perfumería español con el objeto de analizar los gustos y preferencias de los alumnos de la Facultad de Economía, Empresa y Turismo. Para analizar la demanda, se ha diseñado e implementado una encuesta de preferencias reveladas que permite captar los gustos y preferencias de los alumnos hacia un tipo de perfumería de alta gama o hacia un tipo de perfumería donde por precio y prestaciones se le facilita un producto sustitutivo que le satisface sus necesidades.The main objective of this work is to characterize the Spanish perfumery service to analyze the tastes and preferences of students of the Faculty of Economics, Business and Tourism. To analyze the demand, a survey of revealed preferences has been designed and implemented to capture the tastes and preferences of students towards a type of high-end perfumery or a type of perfumery where, for price and benefits, a substitute product is provided. That satisfies your needs

    Modificaciones en la gestión del espectro: opciones y situación actual

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    El objetivo de este artículo es presentar las opciones que están considerándose (incluso ya aplicándose) para la reforma de los mecanismos de gestión del espectro radioeléctrico y evaluar su conveniencia y oportunidad. En concreto, se describen y valoran los tres cambios más profundos en este posible cambio de modelo: autorización del mercado secundario, utilización de la subasta para la asignación primaria y liberalización plena del uso del espectro. El proceso ya en marcha de introducción de estos cambios en España es también analizado
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