Deterministic Modularity Optimization

We study community structure of networks. We have developed a scheme for maximizing the modularity Q based on mean field methods. Further, we have defined a simple family of random networks with community structure; we understand the behavior of these networks analytically. Using these networks, we show how the mean field methods display better performance than previously known deterministic methods for optimization of Q.Comment: 7 pages, 4 figures, minor change

La casa Milans: una empresa catalana en Rusia (1773-1779)

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Degree of intervality of food webs: From body-size data to models

In food webs, the degree of intervality of consumers' diets is an indicator of the number of dimensions that are necessary to determine the niche of a species. Previous studies modeling food-web structure have shown that real networks are compatible with a high degree of diet contiguity. However, current models are also compatible with the opposite, namely that species' diets have relatively low contiguity. This is particularly true when one takes species' body size as a proxy for niche value, in which case the indeterminacy of diet contiguities provided by current models can be large. We propose a model that enables us to narrow down the range of possible values of diet contiguity. According to this model, we find that diet contiguity not only can be high, but must be high when species are ranked in ascending order of body size.This work was supported by a James S. Mc Donnell Foundation Research Award (R.G.), European Union Grant PIRG-GA-2010-277166 (R.G.), Spanish Ministerio de Ciencia e Innovación (MICINN) Grants FIS2009-13370-C02-01 A.A.), FIS2010-18639 (R.G.), PRODIEVO, and FIS2011-27569 (J.A.C.), Comunidad de Madrid Grant MODELICO-CM (J.A.C.) and by Generalitat de Catalunya 2009-SGR-838 (A.A.).Publicad

Comunication plan for Mr. Wonderful

Treball Final de Grau en Publicitat i Relacions Públiques. Codi: PU0932. Curs: 2014/2015Mr. Wonderful es una marca de regalos y complementos de diseño alegre y motivador cuyos valores hacen que este muy bien posicionada en los públicos femeninos y jóvenes. Sin embargo, vemos que hay otros públicos que apenas conocen la marca. Con este plan de comunicación buscamos darse a conocer a otro público y aportar un valor diferencial a la marca que consiga distinguirla de la competencia y meterse en la short list mental de los consumidores. Para ello, vamos a desarrollar diversas estrategias centradas en el público interno, para que estos transmitan la identidad corporativa de la marca a los consumidores. Por otra parte, otras más dirigidas al público joven, que ya conoce la marca, con la finalidad de fidelizarlos. Y otras en un público que desconoce la marca y al que queremos acercársela gracias a la notoriedad que la marca puede conseguir.Mr. Wonderful is a brand of presents and accessories that have cheerful and positive designs, their values are rated positively in young and feminine people. However, we see other public who don’t know anything about this brand. With this communication plan, we want to release to other public and find different values to Mr. Wonderful that get a competition differentiate. And, so Mr. Wonderful get in the mental short list of consumers. To achieve it, we have developed many strategies to different publics. To internal public, we have carried out strategies in order to internalize the corporative identity of Mr. Wonderful and, then, they will transmit it to the consumers. On the other hand, to the young public, who know a lot about the brand, we have developed strategies to achieve their loyalty. And, other strategies to the public who doesn’t know about this brand, in order to bring closer the brand to this public, thanks to give notoriety to Mr. Wonderful

The Network of Scientific Collaborations within the European Framework Programme

We use the emergent field of Complex Networks to analyze the network of scientific collaborations between entities (universities, research organizations, industry related companies,...) which collaborate in the context of the so-called Framework Programme. We demonstrate here that it is a scale--free network with an accelerated growth, which implies that the creation of new collaborations is encouraged. Moreover, these collaborations possess hierarchical modularity. Likewise, we find that the information flow depends on the size of the participants but not on geographical constraints.Comment: 13 pages, 6 figure

Urban traffic from the perspective of dual graph

In this paper, urban traffic is modeled using dual graph representation of urban transportation network where roads are mapped to nodes and intersections are mapped to links. The proposed model considers both the navigation of vehicles on the network and the motion of vehicles along roads. The road's capacity and the vehicle-turning ability at intersections are naturally incorporated in the model. The overall capacity of the system can be quantified by a phase transition from free flow to congestion. Simulation results show that the system's capacity depends greatly on the topology of transportation networks. In general, a well-planned grid can hold more vehicles and its overall capacity is much larger than that of a growing scale-free network.Comment: 7 pages, 10 figure

Chaperones as integrators of cellular networks: Changes of cellular integrity in stress and diseases

Cellular networks undergo rearrangements during stress and diseases. In un-stressed state the yeast protein-protein interaction network (interactome) is highly compact, and the centrally organized modules have a large overlap. During stress several original modules became more separated, and a number of novel modules also appear. A few basic functions, such as the proteasome preserve their central position. However, several functions with high energy demand, such the cell-cycle regulation loose their original centrality during stress. A number of key stress-dependent protein complexes, such as the disaggregation-specific chaperone, Hsp104, gain centrality in the stressed yeast interactome. Molecular chaperones, heat shock, or stress proteins form complex interaction networks (the chaperome) with each other and their partners. Here we show that the human chaperome recovers the segregation of protein synthesis-coupled and stress-related chaperones observed in yeast recently. Examination of yeast and human interactomes shows that (1) chaperones are inter-modular integrators of protein-protein interaction networks, which (2) often bridge hubs and (3) are favorite candidates for extensive phosphorylation. Moreover, chaperones (4) become more central in the organization of the isolated modules of the stressed yeast protein-protein interaction network, which highlights their importance in the de-coupling and re-coupling of network modules during and after stress. Chaperone-mediated evolvability of cellular networks may play a key role in cellular adaptation during stress and various polygenic and chronic diseases, such as cancer, diabetes or neurodegeneration.Comment: 13 pages, 3 figures, 1 glossar