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Title
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Urban Social Networks: Sensing, Modelling and Visualising Urban Mobility and Copresence Networks
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Abstract
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Moving human-computer interaction off the desktop and into our cities requires new approaches to
understanding people and technologies in the built environment. We approach the city as a system,
with human, physical and digital components and behaviours. In creating effective and usable urban
pervasive computing systems, we need to take into account the patterns of movement and encounter
amongst people, locations, and mobile and fixed devices in the city. Advances in mobile and wireless
communications have enabled us to detect and record the presence and movement of devices through
cities. This paper makes a number of methodological and empirical contributions. We present a toolkit
of algorithms and visualisation techniques that we have developed to model and make sense of spatial
and temporal patterns of mobility, presence and encounter. Applying this toolkit, we provide an analysis
of urban Bluetooth data based on a longitudinal dataset containing millions of records associated with
more than 70000 unique devices in a city in the UK. Through a novel application of established complex
network analysis techniques, we demonstrate a significant finding on the relationship between temporal
factors and network structure. Finally, we suggest how our understanding and exploitation of these data
may begin to inform the design and use of urban pervasive systems.
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Bio
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Vassilis Kostakos is an Assistant Professor in the Madeira Interactive Technologies Institute at the
University of Madeira, and an Adjunct Assistant Professor at the Human Computer Interaction Institute at
Carnegie Mellon University. He holds a BSc and PhD in Computer Science from the University of Bath.
He received an IBM Faculty Award in 2010, and is a Fellow of the Finland Distinguished Professor Programme.
His research has been reported by popular media such as the BBC and New Scientist, and he regularly consults
on social networking systems. His current projects address security and privacy for the web and situated
services, novel sensing techniques for urban transport, sustainability, and modeling of city-scale mobility.
His interests include: mobile and pervasive computing, human-computer interaction, social networks, security
and privacy, modeling and simulation, epidemics, wireless technologies, and space syntax.
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