Exploring complex systems through applications

Exploring Complex Mobile Life through Lightweight Visualizations

Smart phones can be used to collect various types of data from a user spanning call and text message logs to GPS coordinates, and to Bluetooth detection. These data are indicative of behavior across various socio-temporalspatial contexts. For the purpose of inspecting the expected and discovering the unexpected from the data, we developed lightweight visualizations with a low cost. The interact...

Exploring Social Phenomena with Complex Systems Tools

This thesis explores the problems raised by the aggregation of entities into a global,collective level, an old problem encountered in many fields of science. We work on threeprojects related to the aggregation problem in social systems, using tools derived fromstatistical physics, and more generally quantitative tools. Great care is taken to tacklethe questions at the heart of t...

Complex fuzzy linear systems

Exploring reliability of exascale systems through simulations

Exascale computers are predicted to emerge by the end of this decade with millions of nodes and billions of concurrent cores/threads. One of the most critical challenges for exascale computing is how to effectively and efficiently maintain the system reliability. Checkpointing is the state-of-theart technique for high-end computing system reliability that has proved to work well for current pet...

Exploring the organisation of complex systems through the dynamical interactions among their relevant subsets

Complex systems often show forms of organisation where a clear-cut hierarchy of levels with a well-defined direction of information flow cannot be found. In this paper we propose an information-theoretic method aimed at identifying the dynamically relevant parts of a system along with their relationships, interpreting in such a way the system’s dynamical organisation. The analysis is quite gene...