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The Scaling of Human Interactions with City Size

The pace of life accelerates with city size, manifested in a per capita increase of almost all socioeconomic rates such as GDP, wages, violent crime or the transmission of certain contagious diseases. Here, we show that the structure and dynamics of the underlying network of human interactions provides a possible unifying mechanism for the origin of these pervasive regularities. By analyzing billions of anonymized call records from two European countries we find that human social interactions follow a superlinear scale-invariant relationship with city population size. This systematic acceleration of the interaction intensity takes place within specific constraints of social grouping. Together, these results provide a general microscopic basis for a deeper understanding of cities as co-located social networks in space and time, and of the emergent urban socioeconomic processes that characterize complex human societies.

 

The Scaling of Human Interactions with City Size

Markus Schläpfer, Luis M. A. Bettencourt, Mathias Raschke, Rob Claxton, Zbigniew Smoreda, Geoffrey B. West, Carlo Ratti

http://arxiv.org/abs/1210.5215


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FuturICT: A planetary nervous system for social mining and collective awareness:F.Giannotti, D.Pedreschi, A.Pentland, P.Lukowicz, D.Kossmann, J. Crowley and D.Helbing

FuturICT: A planetary nervous system for social mining and collective awareness:F.Giannotti, D.Pedreschi, A.Pentland, P.Lukowicz, D.Kossmann, J. Crowley and D.Helbing | FuturICT Journal Publications | Scoop.it
By F.Giannotti, D.Pedreschi, A.Pentland, P.Lukowicz, D.Kossmann, J. Crowley and D.Helbing
We present a research roadmap of a Planetary Nervous System (PNS), capable of sensing and mining the digital breadcrumbs of human activities and unveiling the knowledge hidden in the big data for addressing the big questions about social complexity. We envision the PNS as a globally distributed, self-organizing, techno-social system for answering analytical questions about the status of world-wide society, based on three pillars: social sensing, social mining and the idea of trust networks and privacy-aware social mining. We discuss the ingredients of a science and a technology necessary to build the PNS upon the three mentioned pillars, beyond the limitations of their respective state-of-art. Social sensing is aimed at developing better methods for harvesting the big data from the techno-social ecosystem and make them available for mining, learning and analysis at a properly high abstraction level. Social mining is the problem of discovering patterns and models of human behaviour from the sensed data across the various social dimensions by data mining, machine learning and social network analysis. Trusted networks and privacy-aware social mining is aimed at creating a new deal around the questions of privacy and data ownership empowering individual persons with full awareness and control on own personal data, so that users may allow access and use of their data for their own good and the common good. The PNS will provide a goal-oriented knowledge discovery framework, made of technology and people, able to configure itself to the aim of answering questions about the pulse of global society. Given an analytical request, the PNS activates a process composed by a variety of interconnected tasks exploiting the social sensing and mining methods within the transparent ecosystem provided by the trusted network. The PNS we foresee is the key tool for individual and collective awareness for the knowledge society. We need such a tool for everyone to become fully aware of how powerful is the knowledge of our society we can achieve by leveraging our wisdom as a crowd, and how important is that everybody participates both as a consumer and as a producer of the social knowledge, for it to become a trustable, accessible, safe and useful public good.
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JOURNAL: THE EUROPEAN PHYSICAL JOURNAL SPECIAL TOPICS  Vol. 214 (November II 2012)"Participatory Science and Computing for Our Complex World".

http://epjst.epj.org/index.php?option=com_toc&url=/articles/epjst/abs/2012/14/contents/contents.html

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