Simulación de ecuaciones de reacción-difusión mediante autómatas de gas reticular : aplicación a vertidos costeros

Doctorado en Ciencias del Mar

Un tema de álgebra lineal : sistemas de ecuaciones lineales

Lección introductoria al Álgebra Lineal a nivel de Primer curso de Universidad, poniendo énfasis en los aspectos genéticos. Se prueban varias versiones del teorema de Alternativa de Fredholm (versión "Teorema de Rouché-Fröbenius") para Sistemas lineales.

Precondicionamiento de sistemas de ecuaciones de matrices variables en la modelización de campos de viento

Eliminadas las páginas en blanco del pdf

Sobre algunos problemas reales en visión por ordenador que conducen a sistemas de ecuaciones algebraicos

[EN] In this paper we present some real problems which appear in computer vision which yields to nonlinear system of algebraic equations. We study the problem of camera calibration. Roughly speaking camera calibration consists in looking at the camera position in the 3- D world using as information the projection of a 3- D Scene in a 2-D plane (the photogram). The problem is quite different when we use a single view or several views (stereo vision) of the 3-D scene. We will show in this paper how these problems yields to nonlinear algebraic system of equations.

Reconstrucción 3-D a partir de un par estéreo de imágenes en color utilizando ecuaciones en derivadas parciales

[ES] En este trabajo proponemos un nuevo modelo para el cálculo de la disparidad y la reconstrucción 3-D a partir de un sistema estéreo compuesto por 2 imágenes en color. Proponemos un nuevo modelo para el cálculo de la disparidad basado en un criterio de energía. Para calcular los mínimos de este funcional de energía utilizamos la ecuación en derivadas parciales de Euler-Langrage asociada. Este modelo es una extensión a imágenes color del modelo desarrollado en "L. Alvarez, R. Deriche, J. Sánchez and J. Weickert, Dense disparity map estimation respecting image discontinuities : A PDE and Scale-Space Based Approach. INRIA Rapport de Recherche Nº 3874, 2000". Con algunos cambios en la estrategia parav evitar caer en mínimos locales de la energía. Por último presentamos algunas experiencias numéricas de la reconstrucción 3-D obtenida con este método en algunos pares estéreos de imágenes reales.

Il razzismo della prosperità nell’Europa contemporanea - Riflessioni a margine del pensiero antirazzista di Walter Lorenz

Recent publishing on the migration phenomena in the communitarian and globalized Europe, puts in evidence a fundamental racism which is capable of making cultural processes grow and feed both chaos and social disorder. As a matter of fact we are approaching the ending debates on multicultural citizenship as well as on solidary integration and antiracism. Since the appearing of these phenomena, namely the huge post colonial migration in the nineteen-eighties, by which the colonized countries became almost “emigrant nurseries”, one could expect their stabilization. On the contrary, globalization and migration (twin subjects) everywhere still produce, at various levels, social disturbances together with some chauvinistic limitations as an ultimate kind of western prosperity defense. The peculiar European features of this new racism, less than ideological (superiority, homogeneity and civilizing mission), are confined to the concepts of patriotism, inequality and exclusion. In these terms one can understand why the new economic expansionism and the quest for new world markets makes European policies unstable, which remain undecided between conservatism, liberalism and extreme right. All this explains at least two things: the existing ambiguities of some European policies aiming to enhance particular forms of protectionism, and the difficulties in which the antiracist thought seems to be embedded. Indeed, according to what Walter Lorenz has already made clear, by using a well founded methodology, which prevents any fruitless protestations, it is impossible to contrast racism and nationalism. In such context, the educational field should try to use an operative epistemology. In other words the antiracist thought should dispose of competences and skills and, especially, personal and reflective capabilities. All this in order to avoid that which, in different historical scenes, permit the revival of the sense of moral opprobrium could not be identified with the political alibi to maintain privileges as well as advantages for the exclusive benefit of wealthy countries.

Walter Lorenz – Wegbegleiter und Orientierungspunkt in der interkulturellen Sozialen Arbeit

First meeting, common interests and ways together The European Centre for Social Welfare, Training and Research situated in Vienna, was our first meeting place. W. Lorenz was interested in the international comparison of the different concepts and perspectives of social welfare problems in the European countries and the different developments in the training of social professions in Europe. The challenge of intercultural, antiracist social work in the context of Erasmus-Intensive Seminars To organize an intensive seminar with the aim to train students and colleagues for intercultural and antiracist competence in social professions, we formed an European network of European universities and schools of s.w. in Vienna (VIENNET), with the support of ECCE (European Centre of Community Education) in Koblenz. “The group discovered that working on these issues in an international context raises issues of ‘difference’ with renewed acuteness”(cit. W. Lorenz). We learned to cope with a variety of differences: biographical, language, theoretical and institutional backgrounds and discourse traditions. A Venue for an Intensive Seminar In choosing a venue for an Intensive Seminar we were relatively free. We locked for a place, “one dream about”, to support in the best way our seminar aims, to promote a base built on knowledge, skills and values particularly in the area of inner/outer borders, disadvantage, ignorance, minorities, majorities, vulnerable groups, racism and xenophobia. In a small village in Burgenland (Austria), very close to the Hungarian border, we thought to have found it. Future Prospect Are we only representatives of our background institutions or did we act and exposed ourselves as persons with a very specific biography and training experience. Can we sustain this created network, as a network of experts and friends in the field of intercultural, antiracist social work? This question is still open.