Exploració per autor "Vespignani, Alessandro"
Ara es mostren els items 24-34 de 34
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Random walks and search in time-varying networks
Perra, N.; Baronchelli, Andrea; Mocanu, D.; Gonçalves, B.; Pastor Satorras, Romualdo; Vespignani, Alessandro (2012-12-04)
Article
Accés obertThe random walk process underlies the description of a large number of real-world phenomena. Here we provide the study of random walk processes in time-varying networks in the regime of time-scale mixing, i.e., when the ... -
Reaction-diffusion processes and metapopulation models in heterogeneous networks
Colizza, V; Pastor Satorras, Romualdo; Vespignani, Alessandro (2007-03-04)
Article
Accés obertDynamical reaction–diffusion processes and metapopulation models are standard modelling approaches for a wide array of phenomena in which local quantities—such as density, potentials and particles—diffuse and interact ... -
Reaction-diffusion system with self-organized critical behavior
Pastor Satorras, Romualdo; Vespignani, Alessandro (Springer, 2001-01)
Article
Accés obertWe describe the construction of a conserved reaction-diffusion system that exhibits self-organized critical (avalanche-like) behavior under the action of a slow addition of particles. The model provides an illustration of ... -
Sandpiles and absorbing-state phase transitions: recent results and open problems
Muñoz Martínez, Miguel Ángel; Dickman, Ronald; Pastor Satorras, Romualdo; Vespignani, Alessandro; Zapperi, Stefano (2001-06-13)
Capítol de llibre
Accés restringit per política de l'editorial -
Structure of cycles and local ordering in complex networks
Caldarelli, G; Pastor Satorras, Romualdo; Vespignani, Alessandro (Springer, 2004-03-01)
Article
Accés obertWe study the properties of quantities aimed at the characterization of grid-like ordering in complex networks. These quantities are based on the global and local behavior of cycles of order four, which are the minimal ... -
The architecture of complex weighted networks
Barrat, A; Barthelemy, M; Pastor Satorras, Romualdo; Vespignani, Alessandro (2004-03-16)
Article
Accés obertNetworked structures arise in a wide array of different contexts such as technological and transportation infrastructures, social phenomena, and biological systems. These highly interconnected systems have recently been ... -
Topology and correlations in structured scale-free networks
Vázquez, A; Boguña Espinal, Marian; Moreno, Y; Pastor Satorras, Romualdo; Vespignani, Alessandro (2003-04)
Article
Accés obertWe study a recently introduced class of scale-free networks showing a high clustering coefficient and nontrivial connectivity correlations. We find that the connectivity probability distribution strongly depends on the ... -
Topology, hierarchy, and correlations in Internet graphs
Pastor Satorras, Romualdo; Vázquez, Alexei; Vespignani, Alessandro (2004)
Capítol de llibre
Accés restringit per política de l'editorialWe present a statistical analysis of different metrics characterizing the topological properties of Internet maps, collected at two different resolution scales: the router and the autonomous system level. The metrics we ... -
Universality class of absorbing phase transitions with a conserved field
Rossi, M; Pastor Satorras, Romualdo; Vespignani, Alessandro (American Institute of Physics (AIP), 2000-08-28)
Article
Accés obertWe investigate the critical behavior of systems exhibiting a continuous absorbing phase transition in the presence of a conserved field coupled to the order parameter. The results obtained point out the existence of a new ... -
Universality classes in directed sandpile models
Pastor Satorras, Romualdo; Vespignani, Alessandro (1999-07-27)
Article
Accés restringit per política de l'editorialWe perform large-scale numerical simulations of a directed version of the two-state stochastic sandpile model. Numerical results show that this stochastic model defines a new universality class with respect to the Abelian ... -
Velocity and hierarchical spread of epidemic outbreaks in scale-free networks
Barthelemy, M; Barrat, A; Pastor Satorras, Romualdo; Vespignani, Alessandro (American Institute of Physics (AIP), 2004-04-30)
Article
Accés obertWe study the effect of the connectivity pattern of complex networks on the propagation dynamics of epidemics. The growth time scale of outbreaks is inversely proportional to the network degree fluctuations, signaling that ...