La notion d’image est polysémique à différents titres. D’un point de vue physique, une image traduit la représentation spatiale d’une grandeur donnée (l’intensité d’un rayonnement électromagnétique, d’une onde mécanique, etc.). En théorie, une telle image peut être infinie, tant en ce qui concerne son support, c’est-à-dire l’espace sur lequel elle s’appuie, que ses valeurs, c’est-à-dire l’espac...

The aim of a time-space relief cartography is to produce a coherent representation of distances along a network composed of transport modes, and characterised by different speeds. As example of the “simple distances shown on a complex map” domain, the readability of this type of representation can be strongly enhanced by the use of animation techniques. A fly-by of the three-dimensional structu...

— This paper présents a simplified construction of an algorithm space. The intuitive notion ofan algorithm collection goes back to Nolin 1974. Our goal is her e to formalize and simplify this présentation of algorithm theory. The introduction of a computability notion was induced by the utilization of bundie theory. We build an enumerable algorithm space where ever y object is computable. Résum...

We consider the estimation of the Directions-Of-Arrival (DOA) of target signals in diffuse noise. The state-of-the-art MUltiple SIgnal Classification (MUSIC) algorithm necessitates accurate identification of the signal subspace. In diffuse noise, however, it is difficult to identify it directly from the observed spatial covariance matrix. In our approach, we estimate the target spatial covarian...

this paper focuses on some of the ways in which spatiality is relevant to Borges’s work. Before considering some of his major stories from this perspective, however, it is worth noting an element of theoretical background that underpins much of the discussion that is presented here. This is the notion of the “production of space” formulated by Henri Lefebvre in his 1974 book La production de l’...

Since Aronszajn (1950), it is well known that a functional Hilbert space, called Reproducing Kernel Hilbert Space (R.K.H.S ), can be associated to any positive definite kernel K. This correspondance is the basis of many useful algorithms. In the more general context of conditionally positive definite kernels the native spaces are the usual theoretical framework. However, the definition of condi...

L attracteur d un syst eme de fonctions it er e est le support d une mesure dite invariante ou auto similaire c est le point xe de l op erateur de Markov dans l espace m etrique des mesures de probabilit e a support compact Un algo rithme al eatoire permet la contruction de l attracteur qui est presque s urement l ensemble des points limites d une orbite Un th eor eme ergodique permet de prouve...