Folksonomies, the Semantic Web, and Movie Recommendation (2009)
Martin Szomszor, Ciro Cattuto, Harith Alani, Andrea Baldassarri, Vittorio Loreto
Abstract. While the Semantic Web has evolved to support the meaningful exchange of heterogeneous data through shared and controlled conceptualisations, Web 2.0 has demonstrated that large-scale...
Collective dynamics of social annotation (2009)
Cattuto, Ciro, Barrat, Alain, Baldassarri, Andrea, Schehr, G., Loreto, Vittorio
The enormous increase of popularity and use of the WWW has led in the recent years to important changes in the ways people communicate. An interesting example of this fact is provided by the now very...
Collective dynamics of social annotation (2009)
Cattuto, Ciro, Barrat, Alain, Baldassarri, Andrea, Schehr, G., Loreto, Vittorio
The enormous increase of popularity and use of the WWW has led in the recent years to important changes in the ways people communicate. An interesting example of this fact is provided by the now very...
Collective dynamics of social annotation (2009)
Cattuto, Ciro, Barrat, Alain, Baldassarri, Andrea, Schehr, G., Loreto, Vittorio
The enormous increase of popularity and use of the WWW has led in the recent years to important changes in the ways people communicate. An interesting example of this fact is provided by the now very...
Collective dynamics of social annotation (2009)
Cattuto, Ciro, Barrat, Alain, Baldassarri, Andrea, Schehr, G., Loreto, Vittorio
The enormous increase of popularity and use of the WWW has led in the recent years to important changes in the ways people communicate. An interesting example of this fact is provided by the now very...
Collective dynamics of social annotation (2009)
Cattuto, Ciro, Barrat, Alain, Baldassarri, Andrea, Schehr, G., Loreto, Vittorio
The enormous increase of popularity and use of the WWW has led in the recent years to important changes in the ways people communicate. An interesting example of this fact is provided by the now very...
Emergent Community Structure in Social Tagging Systems (2008)
Cattuto, Ciro, Baldassarri, Andrea, Servedio, Vito D. P., Loreto, Vittorio
A distributed classification paradigm known as collaborative tagging has been widely adopted in new Web applications designed to manage and share online resources. Users of these applications...
Baldassarri, Andrea, Montuori, Marco, Prieto-Ballesteros, Olga, Manrubia, Susanna C.
Geometrical properties of landscapes result from the geological processes that have acted through time. The quantitative analysis of natural relief represents an objective form of aiding in the...
Stochastic dynamics of a sheared granular medium (2008)
Petri, Alberto, Baldassarri, Andrea, Dalton, Fergal, Pontuale, Giorgio, Pietronero, Luciano, Zapperi, Stefano
We experimentally investigate the response of a sheared granular medium in a Couette geometry. The apparatus exhibits the expected stick-slip motion and we probe it in the very intermittent regime...
ABSTRACT Network Properties of Folksonomies (2008)
Christoph Schmitz, Miranda Grahl, Andreas Hotho, Gerd Stumme, Ciro Cattuto, Andrea Baldassarri, ...
Social resource sharing systems like YouTube and del.icio.us have acquired a large number of users within the last few years. They provide rich resources for data analysis, information retrieval, and...
08391 Group Summary -- The Berners-Lee Hypothesis: Power laws and Group Structure in Flickr (2008)
Baldassarri, Andrea, Barrat, Alain, Capocci, Andrea, Halpin, Harry, Lehner, Ulrike, Ramasco, Jose, ...
An intriguing hypothesis, first suggested by Tim Berners-Lee, is that the structure of online groups should conform to a power law distribution. We relate this hypothesis to earlier work around the...
Vocabulary growth in collaborative tagging systems (2007)
Cattuto, Ciro, Baldassarri, Andrea, Servedio, Vito D. P., Loreto, Vittorio
We analyze a large-scale snapshot of del.icio.us and investigate how the number of different tags in the system grows as a function of a suitably defined notion of time. We study the temporal...
Folksonomies, the Semantic Web, and Movie Recommendation (2007)
Szomszor, Martin, Cattuto, Ciro, Alani, Harith, O’Hara, Kieron, Baldassarri, Andrea, Loreto, Vittorio, ...
While the Semantic Web has evolved to support the meaningful exchange of heterogeneous data through shared and controlled conceptualisations, Web 2.0 has demonstrated that large-scale community...
Folksonomies, the Semantic Web, and Movie Recommendation (2007)
Szomszor, Martin, Cattuto, Ciro, Alani, Harith, O’Hara, Kieron, Baldassarri, Andrea, Loreto, Vittorio, ...
While the Semantic Web has evolved to support the meaningful exchange of heterogeneous data through shared and controlled conceptualisations, Web 2.0 has demonstrated that large-scale community...
Folksonomies, the Semantic Web, and Movie Recommendation (2007)
Szomszor, Martin, Cattuto, Ciro, Alani, Harith, O’Hara, Kieron, Baldassarri, Andrea, Loreto, Vittorio, ...
While the Semantic Web has evolved to support the meaningful exchange of heterogeneous data through shared and controlled conceptualisations, Web 2.0 has demonstrated that large-scale community...
Network properties of folksonomies (2007)
Schmitz, Christoph, Grahl, Miranda, Hotho, Andreas, Stumme, Gerd, Cattuto, Ciro, Baldassarri, Andrea, ...
Auch erschienen in: Proceedings. WWW2007 Workshop "Tagging and Metadata for Social Information Organization". Banff, 2007.
Network properties of folksonomies (2007)
Cattuto, Ciro, Schmitz, Christoph, Baldassarri, Andrea, Servedio, Vito D. P., Loreto, Vittorio, Hotho, Andreas, ...
Auch erschienen in: AI Communications. Amsterdam : IOP Press, 2007, Vol. 20, 4, S. 245-262. ISSN 0921-7126
Network properties of folksonomies (2007)
Schmitz, Christoph, Grahl, Miranda, Hotho, Andreas, Stumme, Gerd, Cattuto, Ciro, Baldassarri, Andrea, ...
Auch erschienen in: Proceedings. WWW2007 Workshop "Tagging and Metadata for Social Information Organization". Banff, 2007.
Network properties of folksonomies (2007)
Cattuto, Ciro, Schmitz, Christoph, Baldassarri, Andrea, Servedio, Vito D. P., Loreto, Vittorio, Hotho, Andreas, ...
Auch erschienen in: AI Communications. Amsterdam : IOP Press, 2007, Vol. 20, 4, S. 245-262. ISSN 0921-7126
Chemical etching of a disordered solid: from experiments to field theory (2006)
Gabrielli, Andrea, Baldassarri, Andrea, Munoz, Miguel A., Sapoval, Bernard
We present a two-dimensional theoretical model for the slow chemical corrosion of a thin film of a disordered solid by suitable etching solutions. This model explain different experimental results...
Brownian forces in sheared granular matter (2005)
Baldassarri, Andrea, Dalton, Fergal, Petri, Alberto, Zapperi, Stefano, Pontuale, Giorgio, Pietronero, Luciano
We present results from a series of experiments on a granular medium sheared in a Couette geometry and show that their statistical properties can be computed in a quantitative way from the assumption...
Average trajectory of returning walks (2004)
Colaiori, Francesca, Baldassarri, Andrea, Castellano, Claudio
We compute the average shape of trajectories of some one--dimensional stochastic processes x(t) in the (t,x) plane during an excursion, i.e. between two successive returns to a reference value,...
Velocity fluctuations in cooling granular gases (2003)
Baldassarri, Andrea, Marconi, Umberto Marini Bettolo, Puglisi, Andrea
We study the formation and the dynamics of correlations in the velocity field for 1D and 2D cooling granular gases with the assumption of negligible density fluctuations (``Homogeneous...
Desolneux, Agnes, Sapoval, Bernard, Baldassarri, Andrea
Classically, percolation critical exponents are linked to the power laws that characterize percolation cluster fractal properties. It is found here that the gradient percolation power laws are...
The average shape of a fluctuation: universality in excursions of stochastic processes (2003)
Baldassarri, Andrea, Colaiori, Francesca, Castellano, Claudio
We study the average shape of a fluctuation of a time series x(t), that is the average value _T before x(t) first returns, at time T, to its initial value x(0). For large classes of stochastic...
Analytical results for generalized persistence properties of smooth processes (2000)
Dornic, Ivan, Lemaître, Anaël, Baldassarri, Andrea, Chaté, Hugues
We present a general scheme to calculate within the independent interval approximation generalized (level-dependent) persistence properties for processes having a finite density of zero-crossings....
We present a numerical study of the non-equilibrium dynamics of the Sherrington-Kirkpatrick model. We analize the overlap distribution between the configurations visited at the time t and in...
MODELS OF FREE COOLING GRANULAR GASES
ANDREA BALDASSARRI, ANDREA PUGLISI
We consider the free evolution of systems of granular particles whose dynamics is characterized by a collision rule which preserves the total momentum, but dissipates the kinetic energy. Starting...
EMERGENT COMMUNITY STRUCTURE IN SOCIAL TAGGING SYSTEMS
CIRO CATTUTO, ANDREA BALDASSARRI, VITTORIO LORETO
A distributed classification paradigm known as collaborative tagging has been widely adopted in new Web applications designed to manage and share online resources. Users of these applications...
The average shape of a fluctuation: universality in excursions of stochastic processes
Andrea Baldassarri, Francesca Colaiori, Claudio Castellano
We study the average shape of a fluctuation of a time series x(t), that is the average value _T before x(t) first returns, at time T, to its initial value x(0). For large classes of stochastic...