Uniqueness of limit cycles for quadratic vector fields

Producción CientíficaThis article deals with the study of the number of limit cycles surrounding a critical point of a quadratic planar vector field, which, in normal form, can be written as x ′ = a1x − y − a3x 2 + (2a2 + a5)xy+a6y 2 , y ′ = x+a1y+a2x 2+(2a3+a4)xy−a2y 2 . In particular, we study the semi-varieties defined in terms of the parameters a1, a2, . . . , a6 where some classical criteria for the associated Abel equation apply. The proofs will combine classical ideas with tools from computational algebraic geometry.Agencia Estatal de Investigación - Fondo Europeo de Desarrollo Regional (grant MTM 2011-22751)Junta de Extremadura (grant GR15055)Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (grant MTM2015-65764-C3-1-P

Diavideos: a Diabetes Health Video Portal

Diavideos1 is a web platform that collects trustworthy diabetes health videos from YouTube and offers them in a easy way. YouTube is a big repository of health videos, but good content is sometimes mixed with misleading and harmful videos such as promoting anorexia [1].Diavideos is a web portal that provides easy access to a repository of trustworthy diabetes videos. This poster describes Diavideos and explains the crawling method used to retrieve these videos from trusted channels

An Ontological Representation of the Characteristic Problems of Real-Time Systems

International audienceSoftware Architectural Assessment is becoming a key discipline to identify at early stages of a system synthesis the most important problems that may become relevant in operation. This matter is especially critical for those systems with real-time constraints. Special emphasis shall be made on concurrency issues. Typical RTOS mechanisms supporting concurrency, such as semaphores or monitors, usually lead to execution time penalties hard to identify, reproduce and solve. For this reason it is crucial to understand the root causes of these problems and to provide support to identify and mitigate them at early stages of the system lifecycle. The main objective of this paper is to propose a new classification of the most important problems related to real-time software systems and to provide mechanisms and guidelines to help engineers improve their architectural designs. The taxonomy has been applied to a particular architectural style (UML-PPOOA) and it is used as a reference to create a new assessment module on the PPOOA- Visio CASE tool [15] to support concurrency problems detection

The relationship between public and private saving in Spain : does Ricardian equivalence hold?

This paper aims to test the validity of the Ricardian proposition for the Spanish economy from three different approaches: a) by testing its theoretical implications on the stability of national saving and the relationship between fiscal and current account balances, b) by carrying a number of tests on different structural consumption equations and, c) by testing this hypothesis in consumption functions stemming from the Euler equations derived from a consumer’s maximization problem. Our results lean toward rejection of the Ricardian proposition, although some degree of substitution between public and private saving is detected. In terms of policy implications, these results would suggest that there is some room for fiscal policy to exert its countercyclical role in the case of Spain. However, the effectiveness of such a policy might be limited in a context of rising debt ratios that trigger sustainability concerns and make consumers increasingly Ricardia

Analyse de la consommation de bar et de daurade dans les pays méditerranéens de l' Union.

ABSTRACT. The overall objective of this study is to analyse the situation of the seabream and seabass market, in order to provide relevant information for designing sustainable development strategies. It is divided into two parts: the first is an aggregated study about the factors affecting consumption in the Mediterranean countries of the European Union, which concentrated 79.5% of the consumption of these species in 2005. The second part is more specific and studies the influence that awareness and attitude towards aquaculture has on consumption patterns and valuation of the species, factors that are to be taken into account when designing specific strategies for each market. This latter part is confined to the Spanish market, and therefore results cannot be extrapolated to others, but they may serve as reference given that Spain accounts for 18.6% of total seabream and seabass consumption in the European Union.RÉSUMÉ. L' objectif global de cette étude est d' analyser la situation du marché du bar et de la daurade, afin de fournir une information utile pour la mise au point de stratégies de développement durable. Elle est divisée en deux parties : la première est constituée par une étude agrégée sur les facteurs qui influencent la consommation dans les pays méditerranéens de l Union Européenne, qui ont concentré 79,5% de la consommation de ces espèces en 2005. La seconde partie est plus spécifique et examine l' influence que la sensibilisation et l' attitude vis-à-vis de l 'aquaculture présentent sur les tendances de connsommation et d 'appréciation de ces espèces, facteurs qui entrent en ligne de compte pour la conception de stratégies spécifiques à chaque marché. Cette dernière partie se limite au marché espagnol, et par conséquent les résultats ne peuvent pas être extrapolés à d 'autres marchés, mais ils peuvent toutefois servir de référence étant donné que l' Espagne représente 18,6% de la consommation totale de bar et de daurade au sein de l' Union Européenne

MIRACLE’s hybrid approach to bilingual and monolingual Information Retrieval

The main goal of the bilingual and monolingual participation of the MIRACLE team at CLEF 2004 was testing the effect of combination approaches to information retrieval. The starting point is a set of basic components: stemming, transformation, filtering, generation of n-grams, weighting and relevance feedback. Some of these basic components are used in different combinations and order of application for document indexing and for query processing. Besides this, a second order combination is done, mainly by averaging or by selective combination of the documents retrieved by different approaches for a particular query

Alcance del proyecto. La importancia de su definición.

El alcance junto con el tiempo y el coste son tres de los aspectos clave en el éxito de un proyecto, siendo la definición del alcance lo primero que se debería determinar antes de la planificación temporal y el presupuesto. La definición del alcance se basa en la identificación de los entregables y en la representación estructurada de los trabajos del proyecto que producen dichos entregables. Esa representación estructurada o EDP (Estructura de Descomposición del Proyecto), puede seguir diversas orientaciones, siendo las más utilizadas las de producto o proceso.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Los requisitos en la Ingeniería de sistemas y servicios

En el marco de la ingeniería de sistemas, la conferencia versa sobre algunos de los aspectos centrales de la ingeniería de requisitos: Los obstáculos a su implantación en la universidad e industria, los problemas habituales en la especificación de los requisitos y el proceso de la ingeniería de requisitos. Este repaso se acompaña del relato de experiencias reales (de éxito y fracaso) en este ámbito. Un análisis sobre el futuro de esta materia cierra la conferenciaUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tech