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DTSTART;TZID=Europe/Paris:20170314T130000
DTEND;TZID=Europe/Paris:20170314T140000
DTSTAMP:20260409T084118
CREATED:20170308T144943Z
LAST-MODIFIED:20170308T145553Z
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SUMMARY:Malbor Asllani (FNRS & NaXys)
DESCRIPTION:Title: Desynchronization of the Kuramoto oscillators. A neurostimulation method for controlling epilepsy seizures \n  \nAbstract: \nMany coordination phenomena are based on a synchronization process\, whose global behavior emerges from the interactions among the individual parts. Often in nature\, such self-organized mechanism allows the system to behave as a whole and thus grounding its very first existence\, or expected functioning\, on such process. There are however cases where synchronization acts against the stability of the system; for instance in some neurodegenerative diseases or epilepsy or the famous case of Millennium Bridge where the crowd synchronization of the pedestrians seriously endangered the stability of the structure. In this talk we propose an innovative control method to tackle the synchronization process based on the application of the Hamiltonian control theory\, by adding a small control term to the system we are able to impede the onset of the synchronisation. We illustrate the effectiveness of our method applying it to control the epileptic seizures.
URL:https://www.naxys.be/event/malbor-asllani-fnrs-naxys/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
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DTSTART;TZID=Europe/Paris:20170328T130000
DTEND;TZID=Europe/Paris:20170328T140000
DTSTAMP:20260409T084118
CREATED:20170308T150202Z
LAST-MODIFIED:20170310T193806Z
UID:142-1490706000-1490709600@www.naxys.be
SUMMARY:Tarik Roukny (UGent)
DESCRIPTION:Title: Compressing Over-the-counter Markets \n  \nAbstract: In this talk\, we show both theoretically and empirically that the size of over-the-counter (OTC) markets can be reduced without affecting individual net positions. First\, we find that the networked nature of these markets generates an excess of notional obligations between the aggregate gross amount and the minimum amount required to satisfy each individual net position. Second\, we show conditions under which such excess can be removed while preserving individual net positions. We refer to this operation as compression and identify feasibility and efficiency criteria\, highlighting intermediation as the key element for excess levels. We show that a trade-off exists between the amount of notional that can be removed from the system and the conservation of trading relationships. Third\, we apply our theoretical framework to a unique and comprehensive transaction-level dataset on OTC derivatives. We document large levels of excess across all markets and time. Finally\, we show that compression – when applied at a global level  – can reduce a considerable fraction of total notional even under relationship constrained approaches.
URL:https://www.naxys.be/event/tarik-roukny-ugent/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
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