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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-386@lptms.universite-paris-saclay.fr
DTSTART:20151215T110000Z
DTEND:20151215T120000Z
DTSTAMP:20151124T081340Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-da/
SUMMARY:Séminaire du LPTMS: Andrea Gabrielli - LPTMS\, salle 201\, 2ème 
 étage\, Bât 100\, Campus d'Orsay - 15 Déc 15 11:00
DESCRIPTION:Estimating topological properties of weighted networks from lim
 ited information\n\nAndrea Gabrielli\, Dipartimento di Fisica\, Universit
 à di Roma La Sapienza\n\nA problem typically encountered when studying co
 mplex systems is the limitedness of the information available on their top
 ology\, which hinders our understanding of their structure and of the dyna
 mical processes taking place on them. A paramount example is provided by f
 inancial networks\, whose data are privacy protected: Banks publicly discl
 ose only their aggregate exposure towards other banks\, keeping individual
  exposures towards each single bank secret. Yet\, the estimation of system
 ic risk strongly depends on the detailed structure of the interbank networ
 k. The resulting challenge is that of using aggregate information to stati
 stically reconstruct a network and correctly predict its higher-order prop
 erties. Standard approaches either generate unrealistically dense networks
 \, or fail to reproduce the observed topology by assigning homogeneous lin
 k weights. Here [1]\, we develop a reconstruction method\, based on statis
 tical mechanics concepts\, that makes use of the empirical link density in
  a highly nontrivial way. Technically\, our approach consists in the preli
 minary estimation of node degrees from empirical node strengths and link d
 ensity\, followed by a maximum-entropy inference based on a combination of
  empirical strengths and estimated degrees. Our method is successfully tes
 ted on the international trade network and the interbank money market\, an
 d represents a valuable tool for gaining insights on privacy-protected or 
 partially accessible systems.\n\n[1] G. Cimini\, T. Squartini\, A. Gabriel
 li\, and D. Garlaschelli\, Phys. Rev. E 92\, 040802(R)\, 2015\n
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
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  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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