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DTSTART;TZID=Europe/Brussels:20230406T130000
DTEND;TZID=Europe/Brussels:20230406T140000
DTSTAMP:20260611T040500
CREATED:20230403T135709Z
LAST-MODIFIED:20230403T135709Z
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SUMMARY:Fabian Bastin (University of Montreal (Canada)) - Cinzia Cirillo (University of Maryland (USA))
DESCRIPTION:Title: Large-scale transport model systems: from synthetic population generation to agent-based simulation \nAbstract:  \n1. Generation of synthetic populations exploiting dependency structure transfer (Fabian Bastin) \nThe generation of synthetic populations consists of producing a realistic representation of a target population for modeling and behavioral simulation purposes\, a task that can be tricky when the available multivariate samples are small. Starting from the idea that combining various sources of information makes it possible to design more realistic population generators\, we introduce a new framework based on copulas to generate synthetic data for a population whose only empirical marginal distributions are known\, using a sample from another population sharing a similar dependency structure. We compare the proposed scheme to common methods such as Iterative Proportional Fitting and to modern probabilistic approaches such as Bayesian networks\, variational auto-encoders and generative adversarial networks. We illustrate on American Community Survey data that the method proposed allows to study the structure of the data at different geographical levels in a way that is robust to the peculiarities of the marginal distributions.  \n2. Large scale transportation model systems: an agent-based simulator for the State of Maryland (Cinzia Cirillo) \nThe talk will introduce the architecture of a large-scale microsimulation model that combines population synthesis\, land use models\, transportation choices\, and agent-based transport simulation. This modeling suite overcomes limitations of aggregate four step models and is completely open source. Application of this type of tools will be illustrated in the context of transportation and equity; the first considers the problem of evacuating low-income carless populations during an emergency\, the second evaluates the effects of complete streets on the willingness to walk and bike under different levels of traffic stress. \nThe seminar will take place in Room S08 at the Faculty of Sciences.
URL:https://www.naxys.be/event/fabian-bastin-university-of-montreal-canada-cinzia-cirillo-university-of-maryland-usa/
CATEGORIES:NAXYS Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230413T130000
DTEND;TZID=Europe/Brussels:20230413T140000
DTSTAMP:20260611T040500
CREATED:20230202T103702Z
LAST-MODIFIED:20230202T103828Z
UID:1942-1681390800-1681394400@www.naxys.be
SUMMARY:Hilda A. CERDEIRA (Instituto de Física Teórica\,  UNESP\,  São Paulo\, Brazil)
DESCRIPTION:Title: Phase transition to Synchronization in a system of Swarmalators \nAbstract: Systems of oscillators called Swarmalators\,whose phase and spatial dynamics are coupled\, have been used to describe the dynamics of some living systems. Their collective behavior presents simultaneous aggregation in space and synchronization in phase which in turn leads in some cases to explosive synchronization in a finite population as a function of the coupling parameter between the phases of the internal dynamics. This phenomenon is described using the order parameter and the Hamiltonian formalism. Near the synchronization transition the phase energy of the particles are represented by the XY model\, and they undergo a transition which can be of the first order or second depending on the distribution of natural frequencies of the internal dynamics of the swarmalators. \nThe seminar will take place in Room S08 at the Faculty of Sciences.
URL:https://www.naxys.be/event/hilda-a-cerdeira-instituto-de-fisica-teorica-unesp-sao-paulo-brazil/
CATEGORIES:NAXYS Seminar
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20230417
DTEND;VALUE=DATE:20230420
DTSTAMP:20260611T040500
CREATED:20230221T093113Z
LAST-MODIFIED:20230221T093332Z
UID:1952-1681689600-1681948799@www.naxys.be
SUMMARY:Francqui Chair 2022-2023
DESCRIPTION:On topology and higher–order dynamics of networks and simplicial complexes \nGuest lecturer: Prof. Ginestra Bianconi\, Queen Mary University London and the Alan Turing Institute (UK) \nProgram: \n* Inaugural lecture\, “Topology shapes higher–order network dynamics”\, Monday\, April 17th 2023\, at 17:00\, Auditorium PA02 \nNext lectures\, room S09 \n* Tuesday 18/4/23\, 10:40 – 12:40 Introduction to simplicial complexes and algebraic topology\, 14:00 – 16:00 Topological Synchronization \n* Wednesday 19/04/23\, 10:40 – 12:40 The Dirac operator on networks and simplicial complexes\, 14:00 – 16:00 Higher–order network dynamics driven by the Dirac operator \nWe invite you to register by March the 31st 2023 following this link. \nThe lectures address Master students\, PhD and researchers interested in dynamical systems\, synchronisation\, network science and high-order models and their interactions. \nPhD students can receive credits for their attendance upon request (please check the box in the registration form).
URL:https://www.naxys.be/event/francqui-chair-2022-2023/
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DTSTART;TZID=Europe/Brussels:20230420T130000
DTEND;TZID=Europe/Brussels:20230420T140000
DTSTAMP:20260611T040500
CREATED:20230316T134633Z
LAST-MODIFIED:20230417T081156Z
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SUMMARY:Philippe Naveau (Laboratoire des Sciences du Climat et de l'Environnement (LSCE) CNRS\, France)
DESCRIPTION:Title: Records Analysis in Climate Attribution \nAbstract: Numerical climate models are complex and combine a large number of physical processes. They are key tools in quantifying the relative contribution of potential anthropogenic causes (e.g.\, the current increase in greenhouse gases) on high-impact atmospheric variables like heavy rainfall or temperatures. These so-called climate extreme event attribution problems are particularly challenging in a non-stationary context. In addition\, global climate models like any in sillico numerical experiments are affected by different types of bias. In this talk\, I will discuss about how to combine to different statistical concepts to assess records changes in the context of extreme event attribution. In addition\, the question of uncertainties quantification that remains a challenge in any climate attribution analysis will be explored from various directions. In particular\, a simple model bias correction step for records will described in detail. To illustrate our approach\, we infer emergence times in precipitation from the CMIP5 and CMIP6 archives. This is joint work with Paula Gonzalez\, Soulivanh Thao and Julien Worms. \nThe seminar will take place in Room S08 at the Faculty of Sciences.
URL:https://www.naxys.be/event/philippe-naveau-laboratoire-des-sciences-du-climat-et-lenvironnement-lsce-cnrs-france/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230425T130000
DTEND;TZID=Europe/Brussels:20230425T140000
DTSTAMP:20260611T040500
CREATED:20230221T091059Z
LAST-MODIFIED:20230327T154511Z
UID:1950-1682427600-1682431200@www.naxys.be
SUMMARY:Daniele Avitabile (Vrije Universiteit Amsterdam\, The Netherlands)
DESCRIPTION:Title: Bump Attractors and Waves in Networks of Integrate-and-Fire Neurons\n\nAbstract: Bump attractors are localised patterns observed in in vivo experiments of neurobiological networks. They are important for the brain’s navigational system and specific memory tasks. A bump attractor is characterised by a core in which neurons fire frequently\, while those away from the core do not fire. We uncover a relationship between bump attractors and travelling waves in a classical network of excitable\, leaky integrate-and-fire neurons. This relationship bears strong similarities to the one between complex spatiotemporal patterns and waves at the onset of pipe turbulence. We define and study analytical properties of the voltage mapping\, an operator transforming a solution’s firing set into its spatiotemporal profile. This operator allows us to construct localised travelling waves with an arbitrary number of spikes at the core\, and to study their linear stability. A homogeneous “laminar” state exists in the network\, and it is linearly stable for all values of the principal control parameter. We show that one can construct waves with a seemingly arbitrary number of spikes at the core; the higher the number of spikes\, the slower the wave\, and the more its profile resembles a stationary bump. As in the fluid-dynamical analogy\, such waves coexist with the homogeneous state\, are unstable\, and the solution branches to which they belong are disconnected from the laminar state. We provide evidence that the dynamics of the bump attractor displays echoes of the unstable waves.\n\n\nThe seminar will take place in Room S08 at the Faculty of Sciences.
URL:https://www.naxys.be/event/daniele-avitabile-vrije-universiteit-amsterdam-the-netherlands/
CATEGORIES:NAXYS Seminar
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