2010


Modeling Corporate Epidemiology

  • Study of the effects of intervention strategies on productivity and epidemic spread.

Time Critical Social Mobilization: The DARPA Network Challenge Winning Strategy.

  • We analyze the results of the DARPA Network Challenge.

Common group dynamic drives modern epidemics across social, financial and biological domains.

  • We show that qualitatively different epidemic-like processes from distinct societal domains (finance, social and commercial blockbusters, epidemiology) can be quantitatively understood using the same unifying conceptual framework taking into account the interplay between the timescales of the grouping and fragmentation of social groups together with typical epidemic transmission processes. Different ...

Power law signature of media exposure in human response waiting time distributions.

  • We study the humanitarian response to the destruction brought by the tsunami generated by the Sumatra earthquake of December 26, 2004, as measured by donations, and find that it decays in time as a power law. This behavior is suggested to be the rare outcome of a priority queuing process ...

Harnessing the Power of the Real-Time Social Web

  • Can updating you help Society by updating your Facebook status


2008


Robust dynamic classes revealed by studying the response function of a social system.

  • We demonstrate that online activity such as viewing and sharing videos on YouTube is predictable, and we illustrate new models for classifying the relevance of content based on how much is "spreads"

Direct observation of quantum superconducting fluctuations across the 2D superconductor-insulator transition.

  • We review our recent measurements of the complex AC conductivity of thin InOx films studied as a function of magnetic field through the nominal 2D superconductor-insulator transition. These measurements-the first to probe anything other than the w=0 response of these archetypical systems-reveal a significant finite frequency superfluid stiffness well into ...

Viral, Quality, and Junk videos on YouTube: Separating Content From Noise in an Information-Rich Environment.

  • The emergence of the internet as a vehicle for news, commerce, and social activity has created a wealth of information and content. While Google and others have successfully exploited the web's static structure to identify relevance, the proliferation of user generated content on sites like YouTube and Flickr has created ...


2007


Survival of superconducting correlations across the 2D superconductor-insulator transition: A finite frequency study.

  • The complex ac conductivity of thin highly disordered InOx films was studied as a function of magnetic field through the nominal two-dimensional superconductor-insulator transition. We have resolved a significant finite-frequency superfluid stiffness well into the insulating regime, giving direct evidence for quantum superconducting fluctuations around an insulating ground state and ...

Fluctuations, dissipation, and nonuniversal superfluid jumps in two-dimensional superconductors.

  • We report a comprehensive study of the complex ac conductivity of thin effectively two-dimensional amorphous superconducting InOx films at zero applied field. Below a temperature scale Tc0 where the superconducting order parameter amplitude becomes well defined, there is a temperature where both the generalized superfluid stiffness acquires a frequency dependence ...


2006


Probing the Bose solid: A finite frequency study of the magnetic field-tuned superconductor-insulator transition in two-dimensions.

  • The finite frequency complex conductivity of thin highly disordered InOx films was studied as a function of temperature and magnetic field through the nominal field-tuned 2D superconductor-insulator transition. In zero magnetic field we detect various superconducting fluctuations over a broad range of temperatures. The resistive transition from the normal state ...


2005


The Donation-Payment Gift Card Concept: how to give twice with one card.

  • Currently, there are large amounts of unused funds associated with Prepaid Stored Value cards. These funds are being claimed by either the companies that issue the cards, or State Governments. This has given rise to many complicated legal issues whose outcome does not remove the basic fact that the consumer ...