224,480 research outputs found
The Minóy Machine
No full textThe author provides a first-hand account, as a founding editor of Tellus Audio Cassette Magazine and contributing writer with Punctum Press, of his discovery of the early noise music of Minóy (pseudonym of the sound artist Stanley Keith Bowsza), and its significance within the history of Machine Art
An extension of min/max flow framework
No full textIn this paper, the min/max flow scheme for image restoration is revised. The novelty consists of the fol-
24 lowing three parts. The first is to analyze the reason of the speckle generation and then to modify the
25 original scheme. The second is to point out that the continued application of this scheme cannot result
26 in an adaptive stopping of the curvature flow. This is followed by modifications of the original scheme
27 through the introduction of the Gradient Vector Flow (GVF) field and the zero-crossing detector, so as
28 to control the smoothing effect. Our experimental results with image restoration show that the proposed
29 schemes can reach a steady state solution while preserving the essential structures of objects. The third is
30 to extend the min/max flow scheme to deal with the boundary leaking problem, which is indeed an
31 intrinsic shortcoming of the familiar geodesic active contour model. The min/max flow framework pro-
32 vides us with an effective way to approximate the optimal solution. From an implementation point of
33 view, this extended scheme makes the speed function simpler and more flexible. The experimental
34 results of segmentation and region tracking show that the boundary leaking problem can be effectively
35 suppressed
An experimental comparison of min-cut/max- flow algorithms for energy minimization in vision
No full textMinimum cut/maximum flow algorithms on graphs have emerged as an increasingly useful tool for exactor approximate energy minimization in low-level vision. The combinatorial optimization literature provides many min-cut/max-flow algorithms with different polynomial time complexity. Their practical efficiency, however, has to date been studied mainly outside the scope of computer vision. The goal of this paper is to provide an experimental comparison of the efficiency of min-cut/max flow algorithms for applications in vision. We compare the running times of several standard algorithms, as well as a new algorithm that we have recently developed. The algorithms we study include both Goldberg-Tarjan style "push -relabel" methods and algorithms based on Ford-Fulkerson style "augmenting paths." We benchmark these algorithms on a number of typical graphs in the contexts of image restoration, stereo, and segmentation. In many cases, our new algorithm works several times faster than any of the other methods, making near real-time performance possible. An implementation of our max-flow/min-cut algorithm is available upon request for research purposes
General fuzzy min-max neural network for clustering and classification
No full textThis paper describes a general fuzzy min-max (GFMM) neural network which is a generalization and extension of the fuzzy min-max clustering and classification algorithms of Simpson (1992, 1993). The GFMM method combines supervised and unsupervised learning in a single training algorithm. The fusion of clustering and classification resulted in an algorithm that can be used as pure clustering, pure classification, or hybrid clustering classification. It exhibits a property of finding decision boundaries between classes while clustering patterns that cannot be said to belong to any of existing classes. Similarly to the original algorithms, the hyperbox fuzzy sets are used as a representation of clusters and classes. Learning is usually completed in a few passes and consists of placing and adjusting the hyperboxes in the pattern space; this is an expansion-contraction process. The classification results can be crisp or fuzzy. New data can be included without the need for retraining. While retaining all the interesting features of the original algorithms, a number of modifications to their definition have been made in order to accommodate fuzzy input patterns in the form of lower and upper bounds, combine the supervised and unsupervised learning, and improve the effectiveness of operations. A detailed account of the GFMM neural network, its comparison with the Simpson's fuzzy min-max neural networks, a set of examples, and an application to the leakage detection and identification in water distribution systems are given
Mapping out min protein patterns in fully confined fluidic chambers
No full textThe bacterial Min protein system provides a major model system for studying reaction-diffusion processes in biology. Here we present the first in vitro study of the Min system in fully confined three-dimensional chambers that are lithography-defined, lipid-bilayer coated and isolated through pressure valves. We identify three typical dynamical behaviors that occur dependent on the geometrical chamber parameters: pole-to-pole oscillations, spiral rotations, and traveling waves. We establish the geometrical selection rules and show that, surprisingly, Min-protein spiral rotations govern the larger part of the geometrical phase diagram. Confinement as well as an elevated temperature reduce the characteristic wavelength of the Min patterns, although even for confined chambers with a bacterial-level viscosity, the patterns retain a ~5 times larger wavelength than in vivo. Our results provide an essential experimental base for modeling of intracellular Min gradients in bacterial cell division as well as, more generally, for understanding pattern formation in reaction-diffusion systems.BN/Cees Dekker La
Immunoprophylaxie des cancers colorectaux par des glucides indigestibles fermentables : études chez la souris Min
No full textCertaines fibres alimentaires réduiraient l'apparition des cancers colorectaux mais l'hypothèse reste controversée. Un des mécanismes fait intervenir la production par fermentation de butyrate. Nous avons testé deux fibres butyrogènes chimiquement différentes (fructo-oligosaccharides à chaîne courte scFOS, et amidon résistant) versus une fibre faiblement productrice de butyrate (son de blé désamidonné) chez la souris Min, un modèle de carcinogenèse intestinale spontanée. Seul le régime scFOS réduisait le nombre de tumeurs coliques et stimulait l'immunité locale. La nature chimique de la fibre ou bien les propriétés prébiotiques des scFOS (ils favorisent la croissance de bactéries lactiques qui agiraient sur la réaction immunitaire) sont donc impliquées. Deux autres types d'amidons résistants réduisaient le nombre de petites tumeurs. L'addition de bifidobactéries à l'un de ces deux régimes réduisait le nombre de petites tumeurs, mais augmentait celui de grosses tumeurs illustrant le concept de modulation par l'immunogénicité de la dualité immunofacilitation surveillance. La déplétion en lymphocytes T associée au régime scFOS doublait le nombre de tumeurs par rapport aux
souris immunocompétentes. Le régime scFOS diminuait l'expression du récepteur à l'IL2 à la surface des lymphocytes intra-épithéliaux (LIE) suggérant la mise en anergie temporaire du système immunitaire, mais pouvant aussi signifier l'implication d'une autre voie d'activation des LIE. Enfin, pour mettre en place une modélisation des intéractions lympho-épithéliales, nous avons croisé des
souris C57BL6 et Min avec la souris transgénique Immortomouse et isolé à partir de primo-cultures
de muqueuses des lignées cellulaires conditionnellement immortalisées saines et mutées sur Apc. Ce modèle permettra d'étudier en co-culture sur filtre, l'influence des glucides indigestibles et de leurs produits de fermentation sur les interactions lympho-épithéliales au cours de la carcinogenèse
Bol. geol. min. (Internet)
No full textTítulo tomado de la pantalla principal (consultado el 22 de noviembre 2011
Highly Canalized MinD Transfer and MinE Sequestration Explain the Origin of Robust MinCDE-Protein Dynamics
No full textMin-protein oscillations in Escherichia coli are characterized by the remarkable robustness with which spatial patterns dynamically adapt to variations of cell geometry. Moreover, adaption, and therefore proper cell division, is independent of temperature. These observations raise fundamental questions about the mechanisms establishing robust Min oscillations, and about the role of spatial cues, as they are at odds with present models. Here, we introduce a robust model based on experimental data, consistently explaining the mechanisms underlying pole-to-pole, striped, and circular patterns, as well as the observed temperature dependence of the oscillation period. Contrary to prior conjectures, the model predicts that MinD and cardiolipin domains are not colocalized. The transient sequestration of MinE and highly canalized transfer of MinD between polar zones are the key mechanisms underlying oscillations. MinD channeling enhances midcell localization and facilitates stripe formation, revealing the potential optimization process from which robust Min-oscillations originally arose
Catálogo de la exposición "Bloco Afro Ilú Oba De Min"
No full textCatálogo de la exposición “Bloco Afro Ilú Oba De Min”, del fotógrafo brasileño André Astro, inaugurada el 4 de marzo de 2022, en el Centro de Estudios Brasileños de la Universidad de Salamanca, como parte del programa de Residencia Artística de Fotografía 2022.
La exposición “Bloco Afro Ilú Oba De Min” reúne un conjunto de 24 imágenes en blanco y negro del bloco carnavalesco Afro Ilú Oba De Min, realizadas en el barrio del Bom Retiro en la ciudad de São Paulo (Brasil), en 2019. El objetivo de la muestra es retratar el proceso recreativo, el desfile, del bloco en el período del Carnaval, dando especial visibilidad a la participación de mujeres negras. Se trata, por tanto, de una mirada que construye imágenes que nos ayudan a interpretar los elementos propios de la expresión de la identidad cultural de las protagonistas, a través de cuerpos, gestos, vestimentas y movimiento.
André Astro es arquitecto urbanista, miembro del grupo de rock instrumental O Grande Ogro y productor cultural del proyecto Torto. Como fotógrafo ha participado en exposiciones nacionales como la feria independiente Zine Die (Barueri, São Paulo, Brasil, 2015) y en el 4ºSOAL-2016, salón orientado a las artes visuales que tuvo lugar de mayo a julio en el Memorial da América Latina (São Paulo, Brasil).Catálogo de la exposición “Bloco Afro Ilú Oba De Min”, del fotógrafo brasileño André Astro, inaugurada el 4 de marzo de 2022, en el Centro de Estudios Brasileños de la Universidad de Salamanca, como parte del programa de Residencia Artística de Fotografía 2022
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