Search Results - (Author, Cooperation:A. Vespignani)
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1Latest Papers from Table of Contents or Articles in PressM. E. Halloran ; A. Vespignani ; N. Bharti ; L. R. Feldstein ; K. A. Alexander ; M. Ferrari ; J. Shaman ; J. M. Drake ; T. Porco ; J. N. Eisenberg ; S. Y. Del Valle ; E. Lofgren ; S. V. Scarpino ; M. C. Eisenberg ; D. Gao ; J. M. Hyman ; S. Eubank ; I. M. Longini, Jr.
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-10-25Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Africa, Western/epidemiology ; Ebolavirus/*genetics/isolation & purification ; Epidemiological Monitoring ; Genomics ; Hemorrhagic Fever, Ebola/*epidemiology ; *Human Migration ; Humans ; TravelPublished by: -
2Latest Papers from Table of Contents or Articles in PressD. Lazer ; R. Kennedy ; G. King ; A. Vespignani
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-03-15Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Centers for Disease Control and Prevention (U.S.) ; Data Collection/statistics & numerical data ; Data Interpretation, Statistical ; *Disease Outbreaks ; Humans ; Influenza, Human/*epidemiology ; Office Visits/statistics & numerical data/*trends ; Prognosis ; Social Media/*utilization ; United StatesPublished by: -
3Latest Papers from Table of Contents or Articles in PressD. Lazer ; R. Kennedy ; G. King ; A. Vespignani
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-07-12Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: *Disease Outbreaks ; Humans ; Influenza, Human/*epidemiology ; Office Visits/*trends ; Social Media/*utilizationPublished by: -
4Latest Papers from Table of Contents or Articles in PressFortunato, S., Bergstrom, C. T., Börner, K., Evans, J. A., Helbing, D., Milojevic, S., Petersen, A. M., Radicchi, F., Sinatra, R., Uzzi, B., Vespignani, A., Waltman, L., Wang, D., Barabasi, A.-L.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-03-06Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Online Only, Physics, SociologyPublished by: -
5Articles: DFG German National LicensesStaff View
ISSN: 0378-4371Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0378-4371Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0378-4371Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0378-4371Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0378-4371Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 05.70.Ln Nonequilibrium and irreversible thermodynamics - 05.65.+b Self-organized systemsSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: We apply the moment analysis technique to analyze large scale simulations of the Zhang sandpile model. We find that this model shows different scaling behavior depending on the update mechanism used. With the standard parallel updating, the Zhang model violates the finite-size scaling hypothesis, and it also appears to be incompatible with the more general multifractal scaling form. This makes impossible its affiliation to any one of the known universality classes of sandpile models. With sequential updating, it shows scaling for the size and area distribution. The introduction of stochasticity into the toppling rules of the parallel Zhang model leads to a scaling behavior compatible with the Manna universality class.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 87.23.Ge Dynamics of social systems – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 89.75.Fb Structures and organization in complex systemsSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: We study the one-dimensional behavior of a cellular automaton aimed at the description of the formation and evolution of cultural domains. The model exhibits a non-equilibrium transition between a phase with all the system sharing the same culture and a disordered phase of coexisting regions with different cultural features. Depending on the initial distribution of the disorder the transition occurs at different values of the model parameters. This phenomenology is qualitatively captured by a mean-field approach, which maps the dynamics into a multi-species reaction-diffusion problem.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 89.75.-k Complex systems – 05.70.Ln Nonequilibrium and irreversible thermodynamics – 87.23.Ge Dynamics of social systemsSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: Measurements and data analysis have proved very effective in the study of the Internet's physical fabric and have shown heterogeneities and statistical fluctuations extending over several orders of magnitude. Here we focus on the relationship between the Round-Trip-Time (RTT) and the geographical distance. We define dimensionless variables that contain information on the quality of Internet connections finding that their probability distributions are characterized by a slow power-law decay signalling the presence of scale-free features. These results point out the extreme heterogeneity of Internet delay since the transmission speed between different points of the network exhibits very large fluctuations. The associated scaling exponents appear to have fairly stable values in different data sets and thus define an invariant characteristic of the Internet that might be used in the future as a benchmark of the overall state of “health” of the Internet.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 89.75.-k Complex systems – 87.23.Ge Dynamics of social systems – 05.70.Ln Nonequilibrium and irreversible thermodynamicsSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: We present a detailed analytical and numerical study for the spreading of infections with acquired immunity in complex population networks. We show that the large connectivity fluctuations usually found in these networks strengthen considerably the incidence of epidemic outbreaks. Scale-free networks, which are characterized by diverging connectivity fluctuations in the limit of a very large number of nodes, exhibit the lack of an epidemic threshold and always show a finite fraction of infected individuals. This particular weakness, observed also in models without immunity, defines a new epidemiological framework characterized by a highly heterogeneous response of the system to the introduction of infected individuals with different connectivity. The understanding of epidemics in complex networks might deliver new insights in the spread of information and diseases in biological and technological networks that often appear to be characterized by complex heterogeneous architectures.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Keywords: PACS. 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 05.70.Fh Phase transitions: general studies – 75.10.Nr Spin-glass and other random model – 89.75.Hc Networks and genealogical treesSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract: We present a detailed study of the phase diagram of the Ising model in random graphs with arbitrary degree distribution. By using the replica method we compute exactly the value of the critical temperature and the associated critical exponents as a function of the moments of the degree distribution. Two regimes of the degree distribution are of particular interest. In the case of a divergent second moment, the system is ferromagnetic at all temperatures. In the case of a finite second moment and a divergent fourth moment, there is a ferromagnetic transition characterized by non-trivial critical exponents. Finally, if the fourth moment is finite we recover the mean field exponents. These results are analyzed in detail for power-law distributed random graphs.Type of Medium: Electronic ResourceURL: