78 Result(s)
within
Alessandro Vespignani
English
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Chapter
Fixed Scale Transformation Approach to Fractal Growth in Three Dimensions
The Fixed Scale Transformation (FST)1 is a new theoretical method that appears particularly suitable for irreversible growth models like Diffusion Limited Aggregation (DLA)2 and the Dielectric Breakdown Model (DB...
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Article
Dynamically driven renormalization group
We present a detailed discussion of a novel dynamical renormalization group scheme: the dynamically driven renormalization group (DDRG). This is a general renormalization method developed for dynamical systems...
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Article
Plasticity and avalanche behaviour in microfracturing phenomena
Inhomogeneous materials, such as plaster or concrete, subjected to an external elastic stress display sudden movements owing to the formation and propagation of microfractures. Studies of acoustic emission fro...
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Chapter and Conference Paper
Avalanches and Damage Clusters in Fracture Processes
By simulating two-dimensional models of electric breakdown and fracture it is possible to characterize the rupture of disordered materials subject to an increasing external stress. We provide a review of numer...
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Article
Intermittent dislocation flow in viscoplastic deformation
The viscoplastic deformation (creep) of crystalline materials under constant stress involves the motion of a large number of interacting dislocations1. Analytical methods and sophisticated ‘dislocation dynamics’ ...
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Chapter
Epidemic Spreading in Complex Networks with Degree Correlations
We review the behavior of epidemic spreading on complex networks in which there are explicit correlations among the degrees of connected vertices.
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Article
Global protein function prediction from protein-protein interaction networks
Determining protein function is one of the most challenging problems of the post-genomic era. The availability of entire genome sequences and of high-throughput capabilities to determine gene coexpression patt...
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Article
Evolution thinks modular
Groups of interacting proteins define functional modules that govern a cell's activity. A new study suggests that specific interaction motifs and their constituents are highly conserved across species, identif...
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Chapter and Conference Paper
Traffic-Driven Model of the World Wide Web Graph
We propose a model for the World Wide Web graph that couples the topological growth with the traffic’s dynamical evolution. The model is based on a simple traffic-driven dynamics and generates weighted directe...
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Chapter
Topology, Hierarchy, and Correlations in Internet Graphs
We 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 ...
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Chapter and Conference Paper
Traceroute-Like Exploration of Unknown Networks: A Statistical Analysis
Map** the Internet generally consists in sampling the network from a limited set of sources by using traceroute-like probes. This methodology has been argued to introduce uncontrolled sampling biases that might...
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Article
Behind enemy lines
Computer viruses can spread through networks with alarming speed. But there is hope that those fighting the plague can keep up with the pace.
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Article
Algorithmic Computation and Approximation of Semantic Similarity
Automatic extraction of semantic information from text and links in Web pages is key to improving the quality of search results. However, the assessment of automatic semantic measures is limited by the coverag...
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Article
Reaction–diffusion processes and metapopulation models in heterogeneous networks
Dynamical 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 ...
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Article
Open AccessPredictability and epidemic pathways in global outbreaks of infectious diseases: the SARS case study
The global spread of the severe acute respiratory syndrome (SARS) epidemic has clearly shown the importance of considering the long-range transportation networks in the understanding of emerging diseases outbr...
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Article
Patterns of dominant flows in the world trade web
The large-scale organization of the world economies is exhibiting increasing levels of local heterogeneity and global interdependency. Understanding the relation between local and global features calls for ana...
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Article
Open AccessSeasonal transmission potential and activity peaks of the new influenza A(H1N1): a Monte Carlo likelihood analysis based on human mobility
On 11 June the World Health Organization officially raised the phase of pandemic alert (with regard to the new H1N1 influenza strain) to level 6. As of 19 July, 137,232 cases of the H1N1 influenza strain have ...
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Article
The fragility of interdependency
A study of failures in interconnected networks highlights the vulnerability of tightly coupled infrastructures and shows the need to consider mutually dependent network properties in designing resilient systems.
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Article
Open AccessComparing large-scale computational approaches to epidemic modeling: Agent-based versus structured metapopulation models
In recent years large-scale computational models for the realistic simulation of epidemic outbreaks have been used with increased frequency. Methodologies adapt to the scale of interest and range from very det...
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Article
Patterns of complexity
The Turing mechanism provides a paradigm for the spontaneous generation of patterns in reaction–diffusion systems. A framework that describes Turing-pattern formation in the context of complex networks should ...
