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X-WR-CALNAME:Namur Institute For Complex Systems
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X-WR-CALDESC:Events for Namur Institute For Complex Systems
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20171102T130000
DTEND;TZID=Europe/Paris:20171102T140000
DTSTAMP:20260408T210548
CREATED:20171027T114745Z
LAST-MODIFIED:20171113T081111Z
UID:208-1509627600-1509631200@www.naxys.be
SUMMARY:Duccio Fanelli (University of Florence\, Italy)
DESCRIPTION:Title: Noise-driven neuromorphic tuned amplifier \nAbstract: Living systems execute an extraordinary plethora of complex functions\, that result from the intertwined interactions among key microscopic actors. Positive and negative feedbacks appear to orchestrate the necessary degree of macroscopic coordination\, by propagating information to distant sites while supporting the processing steps that underly categorization and decision making. Excitatory and inhibitory circuits play\, in this respect\, a role of paramount importance. As an example\, networks of excitatory and inhibitory neurons constitute the primary computational units in the brain cortex and can adjust to different computational modalities\, as triggered by distinct external stimuli. The genetic regulation also relies on sophisticated inhibitory and excitatory loops. Working in this context\, we shall here discuss a minimal model for a discrete collection of agents in mutual interaction via excitatory and inhibitory loops\, bearing universality traits in light of its inherent simplicity. Endogenous-noise stemming from finite size corrections induces quasi-cyclic dynamics that display unusual long-range correlations\, persisting over arbitrary large network structures. When the excitatory and inhibitory species are distributed on a directed network\, the internal noise seeds giant quasi-cycles\, with tunable frequency and amplitude. The system spontaneously behaves as an effective\, stochastic driven pacemaker\, a non-trivial self-organized dynamics that hold general interest\, for its fundamental to applied implications. The phenomenon is characterized analytically. The theoretical prediction is corroborated by direct stochastic simulations.
URL:https://www.naxys.be/event/duccio-fanelli-university-of-florence-italy/
LOCATION:E25
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20171110T130000
DTEND;TZID=Europe/Paris:20171110T140000
DTSTAMP:20260408T210548
CREATED:20171027T115837Z
LAST-MODIFIED:20171113T081134Z
UID:219-1510318800-1510322400@www.naxys.be
SUMMARY:Olivier Deparis (UNamur)
DESCRIPTION:Title: Alternative expression of the Bloch wave group velocity using the Sturm-Liouville formalism applied to electromagnetic wave propagation in periodic dielectric media
URL:https://www.naxys.be/event/olivier-deparis-unamur/
LOCATION:E22
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20171116T130000
DTEND;TZID=Europe/Paris:20171116T140000
DTSTAMP:20260408T210548
CREATED:20171027T115436Z
LAST-MODIFIED:20171113T081252Z
UID:216-1510837200-1510840800@www.naxys.be
SUMMARY:Astero Provata (National Center for Scientific Research Demokritos\, Athens)
DESCRIPTION:Title: The influence of the network connectivity in the spatial patterns of chimera states \nAbstract: Chimera states emerge in systems of nonlocally coupled identical oscillators and are characterized by the coexistence of alternating coherent and incoherent domains. These hybrid states appear unexpectedly since all elementary oscillators in the network are identical and are identically coupled. A characteristic feature of chimera states is their mean frequency profile: In the coherent regions\, all elements have equal\, constant mean phase velocity\, while in the incoherent ones the frequency profiles take arc shapes.  Here we present synchronization properties leading to chimera states in networks of coupled neuronal oscillators. To understand the influence of connectivity in the chimera form we investigate the Leaky Integrate and Fire (LIF) model under different connectivity architectures. In the case of nonlocal connectivity\, we show evidence of a coexistence state where multileveled chimera patterns are formed and they coexist with domains consisting of near-threshold elements. The oscillating elements form complex mean phase velocity profiles while the potentials of the near-threshold elements present small fluctuations and never drop to the resting state. We study different synchronization patterns in the parameter space of the LIF system when the oscillators are nonlocally coupled in 1\, 2 and 3 spatial dimensions. We also investigate the effects of different connectivity schemes: nonlocal connectivity\, reflecting coupling\, diagonal or hierarchical (fractal) connectivity. \n– Tsigkri-DeSmedt\, N.D.\, Hizanidis\, J.\, Schöll\, E.\, Hövel\, P.\, Provata\, A.\nChimeras in leaky integrate-and-fire neural networks: effects of reflecting connectivities\,\nEuropean Physical Journal B 90(7)\,139 (2017). \n– Tsigkri-DeSmedt\, N.D.\, Hizanidis\, J.\, Hövel\, P.\, Provata\, A.\nMulti-chimera states and transitions in the Leaky Integrate-and-Fire model with nonlocal and hierarchical connectivity\,\nEuropean Physical Journal: Special Topics 225(6-7)\, pp. 1149-1164 (2016). \n– Schmidt\, A.\, Kasimatis\, T.\, Hizanidis\, J.\, Provata\, A.\, Hövel\, P.\nChimera patterns in two-dimensional networks of coupled neurons\nPhysical Review E 95(3)\,032224 (2017).
URL:https://www.naxys.be/event/astero-provata-national-center-for-scientific-research-demokritos-athens-greece/
LOCATION:E25
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20171123T130000
DTEND;TZID=Europe/Paris:20171123T140000
DTSTAMP:20260408T210548
CREATED:20171108T082106Z
LAST-MODIFIED:20171113T081151Z
UID:224-1511442000-1511445600@www.naxys.be
SUMMARY:Yérali Gandica (UNamur)
DESCRIPTION:Title: Language as a signature of collective identity: Wikipedia editing across twelve languages
URL:https://www.naxys.be/event/yeralica-gandica-unamur/
LOCATION:E25
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20171130T130000
DTEND;TZID=Europe/Paris:20171130T140000
DTSTAMP:20260408T210548
CREATED:20171108T082310Z
LAST-MODIFIED:20171129T200900Z
UID:226-1512046800-1512050400@www.naxys.be
SUMMARY:Marco Sansottera (University of Milan)
DESCRIPTION:Title: On the continuation of degenerate periodic orbits via normal form: full dimensional resonant tori \nAbstract: We reconsider the classical problem of the continuation of degenerate periodic orbits in Hamiltonian systems. In particular we focus on periodic orbits that arise from the breaking of a completely resonant maximal torus. We here propose a suitable normal form construction that allows to identify and approximate the periodic orbits which survive to the breaking of the resonant torus. Our algorithm allows to treat the continuation of approximate orbits which are at leading order degenerate\, hence not covered by classical averaging methods. We discuss possible future extensions and applications to localized periodic orbits in chains of weakly coupled oscillators.
URL:https://www.naxys.be/event/marco-sansottera-university-of-milan-2/
LOCATION:E25
CATEGORIES:NAXYS Seminar
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