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BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230216T130000
DTEND;TZID=Europe/Brussels:20230216T140000
DTSTAMP:20260413T203407
CREATED:20221003T130222Z
LAST-MODIFIED:20230112T082636Z
UID:1698-1676552400-1676556000@www.naxys.be
SUMMARY:Sylvério Pool Marquez (University of Namur)
DESCRIPTION:Title: Impact of mixed-variable management by probability features in an Evolutionary Algorithm \nAbstract: The management of mixed variables\, i.e.\, of different natures (continuous\, integer\, discrete\, categorical) in optimization problems is a challenge\, especially in the presence of categorical variables since there is no concept of order between their possible “values”. In a black-box optimization context\, a way to handle categorical variables has been proposed within a particle swarm algorithm to improve its performance. It consists in defining a probability feature for each “value” of each categorical variable which will evolve during the optimization process. These probabilities are then used to update the population of the algorithm.In this talk\, we present an adaptation of this method to be used in the evolutionary algorithm (EA) implemented in Minamo\, the in-house design space exploration and multi-disciplinary optimization platform developed in the applied research center Cenaero. More specifically\, we propose several ways to use these probabilities inside the genetic operators of the EA and we compare them in order to get a modified version of the EA which is more efficient in the presence of categorical variables. \nThe seminar will take place in Room S08 at the Faculty of Sciences.
URL:https://www.naxys.be/event/sylverio-pool-marquez-university-of-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230209T083000
DTEND;TZID=Europe/Brussels:20230209T180000
DTSTAMP:20260413T203407
CREATED:20230131T213322Z
LAST-MODIFIED:20230131T213447Z
UID:1936-1675931400-1675965600@www.naxys.be
SUMMARY:Women and Girls in Science Workshop
DESCRIPTION:The event will take place in the Auditorium Rosalind Franklin (S01) of the Faculty of Sciences \nMore information on the event\, including the program\, can be found here
URL:https://www.naxys.be/event/women-and-girls-in-science-workshop/
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230125
DTEND;VALUE=DATE:20230128
DTSTAMP:20260413T203407
CREATED:20221205T103807Z
LAST-MODIFIED:20230110T133037Z
UID:1847-1674604800-1674863999@www.naxys.be
SUMMARY:FNRS - EDT Stat - PhD School Nonparametric classification and machine learning - introduction\, comparison and applications
DESCRIPTION:Lecturers: Professor Christophe Ley (University of Luxembourg) and Professor Germain Van Bever (University of Namur) \nIn this short course\, we shall make an introduction to classical tools in nonparametric classification. We shall also take a stroll along Machine Learning from a statistical perspective (discussing inter alia Random Forests)\, including a comparison to statistical learning. We shall illustrate the working of Machine Learning via some concrete applications\, including a prediction of international football tournaments. \nThe school will take place at University of Namur (Room PA02\, Faculty of Sciences) in the mornings (9h30-12h45) of the days 25-26-27 of January. The lectures will be only in person. \nWebsite: https://www.unamur.be/sciences/mathematique/EDStat \nThe school is organized by the department of Mathematics of Université de Namur and naXys\, the Namur Institute for Complex Systems and funded by the FNRS and Université de Namur. \n 
URL:https://www.naxys.be/event/fnrs-edt-stat-phd-school-nonparametric-classification-and-machine-learning-introduction-comparison-and-applications/
CATEGORIES:FNRS PhD School
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20230124T103000
DTEND;TZID=Europe/Brussels:20230124T113000
DTSTAMP:20260413T203407
CREATED:20221219T130314Z
LAST-MODIFIED:20230112T130334Z
UID:1870-1674556200-1674559800@www.naxys.be
SUMMARY:Stefanella Boatto (Department of Applied mathematics\, Institute of Mathematics\, Federal University of Rio de Janeiro\, Brazil)
DESCRIPTION:Title: A journey into the mathematical universe: Topological Data Analysis. A briefintroduction and some applications. \nAbstract: Data Science is a highly evolving discipline that presents many challenges. Forexample\, in the case of an epidemic\, how can we identify which socio–economic and socialparameters\, tourist mobility\, prevention and control measures have the greatest impact onthe dynamics of an epidemic? In recent years Topological Data Analysis has proved to be apowerful tool\, a lens to highlight some dominant features of collective phenomena andexplore large and complex data sets. In this lecture we will see a brief introduction and howthis new discipline is highly multidisciplinary within mathematics itself\, bringing togetherareas such as Space–Time Analysis\, Algebraic Topology\, Complex Networks\, Alg. Linear andComputation. \nThe seminar will take place in Room S08 at the Faculty of Sciences.
URL:https://www.naxys.be/event/stefanella-boatto-department-of-applied-mathematics-institute-of-mathematics-federal-university-of-rio-de-janeiro-brazil/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221215T130000
DTEND;TZID=Europe/Brussels:20221215T140000
DTSTAMP:20260413T203407
CREATED:20221026T125848Z
LAST-MODIFIED:20221114T100200Z
UID:1722-1671109200-1671112800@www.naxys.be
SUMMARY:Victor Pessanha (Mathematical Institute of the Federal University of Rio de Janeiro\, Brazil)
DESCRIPTION:Title: A quick introduction to knots and braids \nAbstract: In this talk I will do an overview on the theory of knots and braids. The idea is to define what these objects are and to present two major theorems relating them by just giving an intuition behind their proof. If possible\, I will also talk about how these objects can naturally appear in the dynamics of point masses. \nThe seminar will take place in Room S08 at the Faculty of Sciences. \n 
URL:https://www.naxys.be/event/victor-pessanha-mathematical-institute-of-the-federal-university-of-rio-de-janeiro/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221201T130000
DTEND;TZID=Europe/Brussels:20221201T140000
DTSTAMP:20260413T203407
CREATED:20220913T114334Z
LAST-MODIFIED:20221205T150804Z
UID:1687-1669899600-1669903200@www.naxys.be
SUMMARY:Johan SEGERS (UCLouvain)
DESCRIPTION:Title: Graphical and uniform consistency of estimated optimal transport plans \nAbstract: A general theory is provided delivering convergence of maximal cyclically monotone mappings containing the supports of coupling measures of sequences of pairs of possibly random probability measures on Euclidean space. The theory is based on the identification of such a mapping with a closed subset of a Cartesian product of Euclidean spaces and leveraging tools from random set theory. Weak convergence in the appropriate Fell space together with the maximal cyclical monotonicity then automatically yields local uniform convergence of the associated mappings. Viewing such mappings as optimal transport plans between probability measures with respect to the squared Euclidean distance as cost function yields consistency results for notions of multivariate ranks and quantiles based on optimal transport\, notably the empirical center-outward distribution and quantile functions. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/johan-segers-uclouvain/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221117T130000
DTEND;TZID=Europe/Brussels:20221117T140000
DTSTAMP:20260413T203407
CREATED:20221025T072145Z
LAST-MODIFIED:20221114T094213Z
UID:1719-1668690000-1668693600@www.naxys.be
SUMMARY:Ariane Courtot (IMCCE\, France)
DESCRIPTION:Title: Chaos in the Geminid Meteoroid stream \nAbstract: Meteor showers originate from a parent body (an asteroid or a comet). This parent body ejects several meteroids\, forming a meteoroid stream\, which will meet the Earth. From Earth\, several meteors can then be observed. To prove they actually form a shower\, we need to show whether they come from the same source. \nBut dynamically linking a meteor shower with its parent body can be challenging. This is in part due to the complex dynamics of meteoroid streams and the influence of non-gravitational forces (FNG). \nWe develop a method to study chaos in meteoroid streams and apply it to the Geminid meteoroid stream. We choose to draw chaos maps\, which relies on chaos indicator. We show that the best one is the Orthogonal Fast Lyapunov Indicator\, after comparison with the Fast Lyapunov Indicator\, the FLI for close encounters and the Mean Exponential Growth factor for Nearby Orbits. \nWe apply this method on the Geminids\, a well-known meteoroid stream. We show the influence of mean-motion resonances with the Earth and with Venus\, which tend to trap the largest particles. The chaos maps present 3 distinct regimes in eccentricity\, reflecting close encounters with the planets. We also study the effect of NGFs and we determine a first approximation of the particle size needed to counterbalance the resonances with the diffusion created by NGFs. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/ariane-courtot-institut-de-mecanique-celeste-et-de-calcul-des-ephemerides-imcce/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221110T130000
DTEND;TZID=Europe/Brussels:20221110T140000
DTSTAMP:20260413T203407
CREATED:20221004T061444Z
LAST-MODIFIED:20221205T150745Z
UID:1700-1668085200-1668088800@www.naxys.be
SUMMARY:Christian Mugisho Zagabe (University of Namur)
DESCRIPTION:Title: Lie-algebraic condition for uniform stability of switched nonlinear systems: Construction of a common Lyapunov function by the Koopman operator approach. \nAbstract: Switched systems consist of a finite set of dynamical systems and a switching signal indicating which system is activated. Their interest is due to the fact that many phenomena in nature\, engineering\,… are represented by different models depending on the change of some parameters. Their stability properties are not intuitive. Indeed\, for two individually stable (or unstable) systems one can construct a signal that makes the whole system unstable (or stable). In the uniform stability theory\, the main goal is to find sufficient (and/or necessary) conditions that make the whole system stable for all possible switching laws. \nIn 1999\, Daniel Liberzon and co-workers proved that for a switched linear system\, the solvability property of the Lie algebra generated by Hurwitz matrices is a sufficient condition for uniform stability. \nIn 2004\, Daniel Liberzon formulated an open problem to find which condition of the Lie algebra (of vector fields) can be used to guarantee the global uniform asymptotic stability (GUAS) of switched nonlinear systems.  \nUsing the Koopman operator approach\, we propose an answer to the open Liberzon problem. Our result is related to the dynamics on the polydisc and shows that a sufficient condition for GUAS follows from the solvability of the Lie algebra generated by the Hurwitz Jacobian matrices of the vector fields. \nMore precisely\, we construct a common Lyapunov function for switched nonlinear systems\, which is convergent in a specific region of the state space. This is done by defining the Koopman operator on the Hardy space on the polydisc where the reproducing kernel property allows us to obtain a Lyapunov function via the evolution of the evaluation functional. We then infer the GUAS property of switched nonlinear systems on a specific invariant set. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/christian-mugisho-zagabe-university-of-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221027T130000
DTEND;TZID=Europe/Brussels:20221027T140000
DTSTAMP:20260413T203407
CREATED:20220914T100044Z
LAST-MODIFIED:20220919T080330Z
UID:1689-1666875600-1666879200@www.naxys.be
SUMMARY:Philippe Toint (University of Namur)
DESCRIPTION:Title: Recent topics in complexity for nonconvex optimization problems \nAbstract: The talk will review results on the evaluation complexity of algorithms for nonlinear (nonconvex) optimization problems. The focus is on unconstrained and “simply constrained” cases and will consider obtaining high-order optimality conditions. Algorithms using inexact information will also be covered. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/philippe-toint-university-of-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221026T103000
DTEND;TZID=Europe/Brussels:20221026T113000
DTSTAMP:20260413T203407
CREATED:20221020T144038Z
LAST-MODIFIED:20221114T100224Z
UID:1714-1666780200-1666783800@www.naxys.be
SUMMARY:Manu Stalport (Geneva University\, Switzerland)
DESCRIPTION:Title: A calibration of chaos for the refinement of planetary systems \nAbstract: The observed diversity of planetary systems raises questions that challenge the formation and evolution models. A precise knowledge of the systems architectures is key in order to identify the leading processes shaping them. In this presentation\, I will discuss on how the study of chaos can provide a more precise view of the planetary systems. A particular interest is drawn on a numerical chaos indicator\, namely the Numerical Analysis of Fundamental Frequencies (NAFF\, J. Laskar)\, and its link with orbital instability. Combining the lessons learned together with a Bayesian exploration of the parameter space\, we design a technique used to refine the planet parameters. I will illustrate this approach on a few notable planetary systems.  \nThe seminar will take place in room S09 at the Faculty of Sciences
URL:https://www.naxys.be/event/manu-stalport-geneva-university/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221024T130000
DTEND;TZID=Europe/Brussels:20221024T140000
DTSTAMP:20260413T203407
CREATED:20221007T065332Z
LAST-MODIFIED:20221205T150731Z
UID:1702-1666616400-1666620000@www.naxys.be
SUMMARY:Hiroya Nakao (Tokyo Institute of Technology\, Japan)
DESCRIPTION:Authors: Yuzuru Kato and Hiroya Nakao* \nTitle: Turing instability in quantum activator–inhibitor systems \nAbstract: We show that Turing instability\, a fundamental mechanism of nonequilibrium self-organization in classical systems\, can also occur in a quantum dissipative system. We propose a quantum-optical parametric oscillator with nonlinear damping as a quantum activator–inhibitor unit\, and numerically demonstrate that a system of two such units can undergo Turing instability when diffusively coupled with each other. The Turing instability induces a pair of nonuniform states that are mixed due to quantum noise. Further performing continuous measurement on the coupled system reveals the nonuniformity caused by the Turing instability. \nReference: Y. Kato and H. Nakao\, “Turing instability in quantum activator-inhibitor systems”\, Sci. Rep. (2022) 12:15573 \nThe seminar will take place in room S07 at the Faculty of Sciences
URL:https://www.naxys.be/event/hiroya-nakao-tokyo-institute-of-technology/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20221013T130000
DTEND;TZID=Europe/Brussels:20221013T140000
DTSTAMP:20260413T203407
CREATED:20220913T114110Z
LAST-MODIFIED:20221205T150659Z
UID:1685-1665666000-1665669600@www.naxys.be
SUMMARY:Jeongjin Lee (University of Namur)
DESCRIPTION:Title: Partial Tail Correlation for Extremes \nAbstract: We develop a method for investigating conditional extremal relationships between variables. We consider an inner product space constructed from transformed-linear combinations of independent regularly varying random variables. By developing theprojection theorem for the inner product space\, we derive the concept of partial tailcorrelation via projection theorem. We show that the partial tail correlation can beunderstood as the inner product of the prediction errors associated with transformed-linear prediction. Similar to Gaussian cases\, we connect partial tail correlation tothe inverse of the inner product matrix and show that a zero in this inverse impliesa partial tail correlation of zero. We develop a hypothesis test for the partial tailcorrelation of zero and demonstrate the performance in a simulation study as well asin two applications: extreme river discharges in the upper Danube basin and highnitrogen dioxide levels in Washington DC. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/jeongjin-lee-university-of-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220922T130000
DTEND;TZID=Europe/Brussels:20220922T140000
DTSTAMP:20260413T203407
CREATED:20220809T081718Z
LAST-MODIFIED:20220815T174230Z
UID:1669-1663851600-1663855200@www.naxys.be
SUMMARY:Pascal Jerono (University of Namur)
DESCRIPTION:Title: Observer and control design for cell population models of yeast fermentation processes \nAbstract: In bioreactors\, the lack of available online process information is a common issue\, due to physical limitations of the reactor or a lack of available sensors. Especially online measurements of the cell distribution with respect to process relevant properties remain to be a challenging task. From a control theory perspective\, the lack of online measurements restricts the control strategy to feed forward control\, which is sensitive to process disturbances or model inaccuracies\, which are typically present in biological systems. This motivates the design of reliable observer schemes for the online estimation of process-relevant state variables based on classically available measurements during cultivation. This talk addresses the observer and control design for cell population models of yeast fermentation processes. Cell population models describe the time evolution of the cell distribution with respect to specific properties like cell mass\, size\, age\, or chemical composition. Modeling of the cell division cycle by means of the population balance equation leads to a partial integro-differential equation\, which is coupled to a set of ordinary differential equations due to the interaction with nutrient dynamics. Different methods to analyze the observability\, detectability\, and controllability of the considered class of systems are discussed and applied to the discretized model equations. Based on the results\, observers and control schemes are designed and validated for the estimation and control of the cell mass distribution in a lab-scale reactor. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/pascal-jerono-university-of-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220712T130000
DTEND;TZID=Europe/Brussels:20220712T140000
DTSTAMP:20260413T203407
CREATED:20220628T152809Z
LAST-MODIFIED:20221114T100248Z
UID:1660-1657630800-1657634400@www.naxys.be
SUMMARY:Aaron Bryan Rosengren (University of California San Diego\, USA)
DESCRIPTION:Title: Space-Manifold Dynamics for Small Solar-System Bodies \nAbstract: Centaurs are a prominent group of small Solar-System bodies in highly dispersed orbits between the two main belts. They are a short-lived transient phase connecting their source reservoir in the Kuiper Belt to the Jupiter-family comets (JFCs) and Halley-type comets (HTCs)\, but the precise dynamical hand-off process between the Centaurs and these short-period comet (SPC) populations remains unclear. The recent finding of an orbital gateway between Jupiter and Saturn\, funneling Centaurs into the inner Solar System\, has cast some light on the orbital migration of these enigmatic bodies. Yet\, no dynamical mechanism to explain the existence of this apparent conduit has hitherto been offered. The talk will link seminal research conducted over two decades ago on Jovian-induced space manifolds with our recent understanding of the orbital architecture of these gravitational structures to elucidate the nature of this and other dynamical channels for the rapid transport of planet-crossing small bodies of the outer Solar System. This work combines the well-developed techniques of astrodynamics for the study of space manifolds with the modern analytical and numerical tools of planetary dynamics\, harnessing these in unique ways to probe for the first time the high time-resolution details of such strongly chaotic orbital evolution. Building from the notion and success of the interplanetary transport network\, studying and understanding space-manifold dynamics in the planetary-science context may also give rise to new and unexpected results that could uncover new Centaur-mission concepts\, motivate entirely new classes of missions\, and amplify scientific return. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/aaron-bryan-rosengren-university-of-california-san-diego/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220616T130000
DTEND;TZID=Europe/Brussels:20220616T140000
DTSTAMP:20260413T203407
CREATED:20220607T184831Z
LAST-MODIFIED:20220613T131033Z
UID:1654-1655384400-1655388000@www.naxys.be
SUMMARY:Corbinian Schlosser (LAAS-CNRS\, Toulouse\, France)
DESCRIPTION:Title: Koopman and Perron-Frobenius operators on reproducing kernel Hilbert spaces \nAbstract: Koopman operators and reproducing kernel Hilbert spaces (RKHS) share a common idea: Giving linear representations of non-linear tasks or objects. We follow the recent path of combining both concepts. The Koopman operator is a composition operator and therefore acts on a function space – in this talk we consider the underlying function space to be an RKHS. We give an introduction to the Koopman operator on an RKHS as well as to its adjoint\, the so-called Perron-Frobenius operator. Both operators are linear but not necessarily bounded. Thus we focus on elementary properties of these operators including closedness and boundedness. We present a collection of known and new results on Koopman operators on RKHS. These results\, with no further specifications on the RKHS\, are restrained and we emphasize that the RKHS should be chosen accordingly to the problem at hand in order to flourish the interplay between the Koopman operator and the RKHS. \nThe seminar will take place in room CH12 at the Faculty of Sciences
URL:https://www.naxys.be/event/corbinian-schlosser-laas-cnrs-toulouse-france/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220602T130000
DTEND;TZID=Europe/Brussels:20220602T140000
DTSTAMP:20260413T203407
CREATED:20220218T173731Z
LAST-MODIFIED:20220517T083614Z
UID:1601-1654174800-1654178400@www.naxys.be
SUMMARY:Lluc Bono Rossello (Université Libre de Bruxelles)
DESCRIPTION:Title: Modelling Music with Multilayer Networks \nIn this talk I will introduce our Multilayer Network Model for musical pieces. The goal of this model is to describe the dynamics and interactions occurring during the generative process of music: how each voice or instrument creates a new melody while interacting with other voices. In such a way\, we establish a link between the properties of these networks and the music that is encoded in such networks. Then\, I will present some of the applications of this model such as the generation of music via synchronized random walks. \n  \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/lluc-bono-rossello-universite-libre-de-bruxelles/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220513T093000
DTEND;TZID=Europe/Brussels:20220513T160000
DTSTAMP:20260413T203407
CREATED:20220503T070802Z
LAST-MODIFIED:20220512T200638Z
UID:1642-1652434200-1652457600@www.naxys.be
SUMMARY:naXys Research Day
DESCRIPTION:CH01 (Rue Grafé 2\, 5000 Namur)\nProgram\nMORNING SESSION (9.30-12.30) \n\nRegistration\n9.40-9.55: Welcome \n9.55-10.40: Flash talks (Part I)\n10.40-11.10: Coffee break\n11.10-11.30: Discover AI Research Pole (E. Tuci)\n11.30-11.40: Meet Jérôme Mallargé\, ADRE ICT scientific advisor\n11.40-12.30: Brainstorming “The post-it game”\n\nLUNCH \nAFTERNOON SESSION (14.00-16.00) \n\n14.00-14.45: Flash talks (Part II)\n14.45-15.30: Brainstorming “The puzzle game”\nConclusions\n\n\nRegistration\nRegistration is free but mandatory\, before Friday\, May 6th\, through the following web form. \nWe strongly encourage submissions of flash talks for all PhD students. PhD students will receive a certificate with ECTS mention for their participation and/or presentation.
URL:https://www.naxys.be/event/naxys_research_day/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220505T130000
DTEND;TZID=Europe/Brussels:20220505T140000
DTSTAMP:20260413T203407
CREATED:20220218T174022Z
LAST-MODIFIED:20220421T125907Z
UID:1603-1651755600-1651759200@www.naxys.be
SUMMARY:Ahmed Almansoori (Université de Namur)
DESCRIPTION:Title: On the evolution of mechanisms for collective decision making in a swarm of robots \nAbstract – A swarm of robots can collectively select an option among the available alternatives offered by the environment through a process known as collective decision-making. This process is characterised by the fact that once the group makes a decision\, it can not be attributed to any of its group members. In the large majority of the swarm robotics literature\, only a few types of mechanisms have been used to allow the robots of a swarm to make collective decisions. Namely\, the mechanisms referred to as the Voter and the Majority model or variations of these two models. In this talk\, we present an alternative solution based on the use of dynamical neural networks as individual decision-making mechanisms. This alternative solution proved effective in a perceptual discrimination task. We will show the results of extensive comparative tests that quantitatively evaluate the Voter model and the dynamic neural network model on a variety of operating conditions and for swarms that differ in their size on a perceptual discrimination task. The results of our study clearly indicate that the performances of a swarm employing dynamical neural networks as the decision-making mechanism are more robust\, more adaptable to a dynamic environment\, and more scalable to a larger swarm size than the performances of a swarm employing the Voter model as the decision-making mechanism. \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/ahmed-almansoori-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220421T130000
DTEND;TZID=Europe/Brussels:20220421T140000
DTSTAMP:20260413T203407
CREATED:20220105T094247Z
LAST-MODIFIED:20220324T133636Z
UID:1515-1650546000-1650549600@www.naxys.be
SUMMARY:Matteo Romano (Université de Namur)
DESCRIPTION:Title:\nStudying the topology of the space population using networks \nAbstract:\nWith more than 23.000 tracked objects orbiting Earth\, satellite operators find themselves dealing with hundreds of conjunctions at risk of collision per week\, situation only getting worse due to the increasingly frequent satellite launches in recent years. Within the WALSAT project\, in collaboration with the industrial partner Aerospacelab\, we aim to represent the space population as a network in order to exploit its properties to study the topology of the population as a whole. The catalogue objects are represented as nodes and links between them are established whenever a close encounter occurs over a given time window. The resulting network is then analysed in terms of properties such as degree\, centrality\, and clustering to identify the most dangerous objects. Moreover\, by weighting the links using the collision probability or the associated risk\, we can identify the most sensitive orbital regions and the objects contributing the most to the overall collisional risk. \n  \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/matteo-romano-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220407T130000
DTEND;TZID=Europe/Brussels:20220407T140000
DTSTAMP:20260413T203407
CREATED:20220217T091156Z
LAST-MODIFIED:20221114T100358Z
UID:1599-1649336400-1649340000@www.naxys.be
SUMMARY:Alessio Franci (Universidad Nacional Autónoma de México\, México)
DESCRIPTION:Title: DECISION FROM INDECISION IN MULTI-AGENT MULTI-OPTION DYNAMICS \nHow does a group of agents break indecision about a set of options? Many biological and artificial multi-agent systems\, from honeybees and bird flocks to bacteria and humans\, face indecision when choosing between options in situations in which the fitness or even the survival of the group is at stake. Here\, we develop a mathematical theory to study decision from indecision. Our approach is grounded in network bifurcation theory. We model decision from indecision as synchrony-breaking in influence networks in which each node is the value assigned by an agent to an option. We show that there are three generic types of value patterns emerging at synchrony-breaking bifurcations for influence networks: deadlock\, consensus\, dissensus. Deadlock and consensus value patterns are predicted by the symmetry of the influence networks. Conversely\, we show that there are many “exotic” dissensus value patterns; that is\, patterns that are not predicted by network symmetries\, but are predicted by network architecture. Numerical simulations of a novel influence network model illustrate our theoretical results. \n\nThis is a joint work with Martin Golubitsky\, Ian Stewart\, Anastasia Bizyaeva\, and Naomi E. Leonard.\n\n\nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/alessio-franci-universidad-nacional-autonoma-de-mexico/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220331T130000
DTEND;TZID=Europe/Brussels:20220331T140000
DTSTAMP:20260413T203407
CREATED:20211207T161029Z
LAST-MODIFIED:20220324T133656Z
UID:1482-1648731600-1648735200@www.naxys.be
SUMMARY:Nicolas Franco (Université de Namur & Hasselt Universiteit)
DESCRIPTION:Title: “Using social contact data to inform covid-19 epidemiological models and parameters” \nConcerning SARS-CoV-2 transmission as well as many other infectious diseases\, heterogeneity and age-related characteristics are crucial in order to correctly capture the dynamics. The use of social contact data is a modern method which has been widely used during the covid-19 pandemic in Belgium and other European countries thanks to the CoMix survey. In this talk\, we present why and how those social contact data should be used. We develop the next generation principle based on Perron-Frobenius theory and derive a new numerical tool to estimate the time-evolution of heterogeneous susceptibility regarding SARS-CoV-2 infection and transmission. \n  \nThe seminar will take place in room S08 at the Faculty of Sciences
URL:https://www.naxys.be/event/nicolas-franco-universite-de-namur-hasselt-universiteit/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220317T130000
DTEND;TZID=Europe/Brussels:20220317T140000
DTSTAMP:20260413T203407
CREATED:20211207T160924Z
LAST-MODIFIED:20220221T111004Z
UID:1480-1647522000-1647525600@www.naxys.be
SUMMARY:Marvyn Gulina (Université de Namur)
DESCRIPTION:Title: Spectral identification of networks with generalized diffusive coupling \nSpectral network identification aims at inferring the eigenvalues of the Laplacian matrix of a network from measurement data. This allows to capture global information on the network structure from local measurements at a few number of nodes. In this paper\, we consider the spectral network identification problem in the generalized setting of a vector-valued diffusive coupling. The feasibility of this problem is investigated and theoretical results on the properties of the associated generalized eigenvalue problem are obtained. Finally\, we propose a numerical method to solve the generalized network identification problem\, which relies on dynamic mode decomposition and leverages the above theoretical results.
URL:https://www.naxys.be/event/marvyn-gulina-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220310T130000
DTEND;TZID=Europe/Brussels:20220310T140000
DTSTAMP:20260413T203407
CREATED:20211207T160831Z
LAST-MODIFIED:20220209T134759Z
UID:1478-1646917200-1646920800@www.naxys.be
SUMMARY:Candy Sonveaux (Université de Namur)
DESCRIPTION:Title:  “Vaccination strategy design by a state-feedback control for an Age-Dependent epidemiologic model” \nAn age-dependent SIR epidemic model is studied with an input corresponding to the vaccination rate of susceptible individuals. The stability analysis of the equilibria highlights that\, when the basic reproduction number is greater than one\, the endemic equilibrium is stable whereas the disease-free one is unstable. According to this result\, we aim to design a stabilizing state-feedback law of vaccination which eradicates the disease. This law is obtained for two different models. The first one consists in a nonlinear set of ordinary differential equations derived from the second one\, a set of nonlinear partial integro-differential equation (PIDE)\, via a discretization by age. For the first model\, Isidori’s theory allows us to design a linearizing stabilizing state-feedback. The second law is deduced from the first one and\, using similar arguments as in Isidori’s theory\, we show that the application of this law to the PIDE model results in a linear\, positive and stable closed-loop system. Moreover\, non-negativity conditions for the feedback law are obtained in both cases\, ensuring real feasibility of the control law. Finally\, numerical simulations complement theoretical arguments.
URL:https://www.naxys.be/event/candy-sonveaux-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220224T130000
DTEND;TZID=Europe/Brussels:20220224T140000
DTSTAMP:20260413T203407
CREATED:20211207T160733Z
LAST-MODIFIED:20220210T124854Z
UID:1476-1645707600-1645711200@www.naxys.be
SUMMARY:Frederik De Laender (Université de Namur)
DESCRIPTION:The seminar will take place in person\, Room S08\, Faculty of Sciences \nTitle: Predicting the impact of environmental change on coexistence \nI introduce a new approach to study effects of regional-scale environmental change on coexistence in ecological communities. The approach is based on the concept of feasibility\, which measures how much one can change a model’s parameters while still maintaining positive species abundances.I will first present analyses in small consumer-resource communities\, and simulations results for larger communities. Together\, these analyses and simulations support the conclusion that simple summary statistics of direct species responses suffice to predict effects on the size of the feasibility domain. However\, our results also reveal that these effects critically depend on the interaction strength between consumers and resources.I will then turn to food chains\, confirming that simple summary statistics again predict environmental change effects on the size of the feasibility domain. In contrast to consumer-resource communities\, however\, these statistics do not scale up to larger food webs.I finally analyse an extensive set of field data of macroinvertebrate counts across thousands of sites along less and more polluted small streams across the USA. These analyses suggest that communities in more polluted sites can coexist across narrower environmental ranges than communities in less polluted sites.
URL:https://www.naxys.be/event/frederik-de-laender-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220211T140000
DTEND;TZID=Europe/Brussels:20220211T153000
DTSTAMP:20260413T203407
CREATED:20211028T130137Z
LAST-MODIFIED:20220207T145029Z
UID:1298-1644588000-1644593400@www.naxys.be
SUMMARY:Women and Girls in Science @ UNamur
DESCRIPTION:11 February 2022 | 2nd edition \nThe UNamur is organizing the 2nd edition of the Women and Girls in Science day\, in the framework of the 2015 declaration by the United Nations General Assembly. \nThis day aims at promoting the access of women and girls to science and technology as well as their full and fair participation. \nDue to the sanitary situation\, the main event is postponed to the Spring. \nInstead\, we will have two speakers in a hybrid event: \nDr. Antonella Fioravanti (VU Brussels\, Belgium) \nProf. Petra Rudolf (RU Groningen\, The Netherlands) \nRegistration is free but mandatory and can be done at this link. \nAny questions?  women-in-science@unamur.be
URL:https://www.naxys.be/event/women-and-girls-in-science-unamur/
ORGANIZER;CN="Lorena BALLESTEROS FERRAZ":MAILTO:lorena.ballesteros@unamur.be
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220210T130000
DTEND;TZID=Europe/Brussels:20220210T140000
DTSTAMP:20260413T203407
CREATED:20211207T160623Z
LAST-MODIFIED:20221114T100445Z
UID:1474-1644498000-1644501600@www.naxys.be
SUMMARY:Leah Keating (University of Limerick\, Ireland)
DESCRIPTION:Online Seminar – Join by using this link \nTitle: “A Multi-Type Branching Process Method for Modelling Complex Contagion on Clustered Networks” \nOnline social networks such as Twitter\, Facebook\, Instagram and TikTok serve as a medium for the spread of information between their users\, we are interested in developing models for this information diffusion to gain a greater understanding of how it spreads. Some models for the spread of online behaviour and information assume that the information behaves similarly to the spread of a virus\, where infection is equally likely after each exposure\, these dynamics are known as a simple contagion. In a simple contagion\, the exposures are independent of each other. However\, online adoption of some behaviour and content has been empirically observed to be more likely after multiple exposures from their network neighbours [1-2]\, the exposures are not independent of each other\, we refer to this as a complex contagion. Analytically tractable descriptions of complex contagions have been developed for continuous-time dynamics. These extend mean-field and pair approximation methods to account for clustering in the network topologies [3]; however\, no such analogous treatments for discrete-time cascade processes exist using branching processes. We describe a novel definition of complex contagion adoption dynamics and show how to construct multi-type branching processes which account for clustering on networks. We achieve this by tracking the evolution of a cascade via different classes of clique motifs which account for the different numbers of active\, inactive and removed nodes. This description allows for extensive Monte Carlo simulations (which are faster than network-based simulations)\, accurate analytical calculation of cascade sizes\, determination of critical behaviour and other quantities of interest. For more information see our preprint on arXiv. \n[1] D. Centola\, The spread of behavior in an online social network experiment\, Science 329\, 1194 (2010).\n[2] D. M. Romero\, B. Meeder\, and J. Kleinberg\, Differences in the mechanics of information diffusion across topics: idioms\, political hashtags\, and complex contagion on twitter\, in Proceedings of the 20th international conference on World wide web (2011) pp. 695–704.\n[3] D. J. P. O’Sullivan\, G. J. O’Keeffe\, P. G. Fennell\, and J. P. Gleeson\, Mathematical modeling of complex contagion on clustered networks\, Frontiers in Physics 3\,10.3389/fphy.2015.00071 (2015). \n 
URL:https://www.naxys.be/event/leah-keating-university-of-limerick/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20220201T093000
DTEND;TZID=Europe/Brussels:20220203T124500
DTSTAMP:20260413T203407
CREATED:20211215T125847Z
LAST-MODIFIED:20230223T110936Z
UID:1491-1643707800-1643892300@www.naxys.be
SUMMARY:FNRS Doctoral School - Introduction to dynamical systems on complex networks
DESCRIPTION:Doctoral School FNRS – Nonlinear phenomena\, complex systems and statistical mechanics \nTime: 1-2-3 February 2022 – 9h30-12h45 \nLocation: Université de Namur\, Faculty of Science\, Room S08 \nLecturers: Mattia Frasca (Università di Catania) & Timoteo Carletti (Université de Namur) \n\nSlides: \n– Carletti\n– Lecture4\n– Lecture5\n– Lecture6 \nTo attend the lectures it is mandatory to be in possession of the Covid Safe Ticket (CST) \nAbstract: We live in an interconnected world\, where “basic” units interact each other to produce unexpected emergent behaviors. Our society is for instance\, the result of the interaction of many agents\, we the human beings\, that exchange information\, news\, opinions\, etc.\, but also likes on Facebook or viruses. To a larger scale\, the societies can be considered as agents interacting each other on a global stage\, by exchanging goods to create the global economy\, or fight each other and thus determine conflicts and wars. Our brain is made of about 100 billions of cells\, i.e.\, the neurons\, connected through even more synapses (millions of billions) allowing the signals to pass from one neuron to the others\, and thus allowing us to think\, act\, remember\, … Finally\, our body is made by about 30 thousand billions of cells\, basic blocks that determine our behavior\, via synchronized processes\, resulting from the exchanges among the cells. The cells are also organized into tissues and organs and so on to allow us to be alive. The following questions emerge thus straightforwardly. Is it possible to understand the behavior of a society ? How to understand the brain functioning\, to distinguish between its regular or irregular behavior (disease) and thus control it to reduce / remove the unwanted behavior ? Can we determine the behavior of (part of) the human body? By using a reductionist approach we will divide the system into its constituting “elementary” parts\, work hard to understand their behavior and then finally scale up the results to have a global picture. This approach has provided excellent results in many relevant cases (e.g.\, particle physics) but in other occasion it has shown its limits. A complementary approach is based on the study of the evolution of some average quantities\, i.e.\, the mean field approach; this approach has been largely used in these last months to study the spreading of the COVID-19\, i.e.\, the epidemic models SIR\, where you group together all the agents with the same feature\, being S\, I or R\, and you no longer make a distinction among each single agent. Modeling is always a matter of obtaining a reasonable trade-off between the details added to the model and its predictive or descriptive power; hence the level of details you add to a model depends on the research question you are dealing with. It is clear that in the above examples\, reductionist or mean field\, may fail to sufficiently well describe the whole system\, indeed the resulting global behavior is not easily ascribed / predicted from the behavior of each single unit. How would it be possible from the behavior of a single human to extract the behavior of a society? Or\, does a neuron has memory? To cope with these issues\, network science and complex systems offer a reliable alternative approach. Let us observe that this is not a completely new research field. Physicists have been used it since long time but relying on regular couplings\, e.g.\, the Ising model on square lattices. Nowadays the emphasis is on the use of coupling\, i.e.\, networks\, that better represent the reality; often such networks have been directly extracted from real data and thus the results better explain the empirical findings. The goal of these lectures is to propose a (personal) view of some interesting research questions arising once dealing with interconnected systems; we will in particular be interested in the study of the emergence of synchronous behavior or on the other hand of patchy\, i.e. spatially heterogeneous\, solutions. In the first part of these series of lectures\, we will survey some basic results of dynamical systems theory\, i.e.\, equilibria\, their stability and bifurcation. The details provided in this first part will depend on the background of the students attending the lectures. Some notions of network theory will be provided and some of the most used models of network will be introduced and characterized (e.g.\, Erdős-Rényi\, Small World\, Scale Free). We will then introduce two interesting coupling among the basic units constituting the system\, long range interaction and diffusive-like interaction. Starting from the behavior of the single isolated units we will study how the coupling will affect the global behavior and in particular the conditions ensuring the emergence of patchy solutions. We will conclude our lectures with some recent generalizations of network theory\, where more complex structures have been considered to go beyond the pairwise interaction modeled by the network theory\, e.g.\, multilayer networks\, temporal networks and hypergraphs. The second part of the course will focus on synchronization of regular and chaotic dynamical systems defined on top of complex networks and on graph-based methods for multiagent systems. The major tool for the study of the stability of synchronization in complex networks (i.e.\, the master stability function) will be presented and then applied to paradigmatic examples. Then\, synchronization in time-varying networks will be discussed. This is a particularly relevant case study where links may adapt in time as it occurs in many natural systems in response to different external conditions. The extension of the master stability function to such framework will be discussed and relevant examples of synchronization in adaptive networks and in networks of mobile agents will be dealt with. Finally\, the course will discuss graph-based methods for multi-agent systems. In particular\, typical multi-agent problems such as rendez-vous and formation control will be considered and solutions based on graph methods will be illustrated. Attention will be given to the communication protocols to set in order to reach the goals of the control\, to the formalization of appropriate consensus methods to address these problems\, and to simple models of interacting robots. This interdisciplinary doctoral course is aimed at PhD and Master students of nonlinear dynamics and complex system; because of the presented subjects and of the possible applications\, students from physics\, biology\, chemistry or economics are warmly invited to attend the lectures. Some basic mathematical knowledge is required\, however the topics will be introduced such in a way that it can be understandable and enjoyable by every researcher interested in collective dynamics and complexity\, with more focus on the bigger picture and less on technical details. \nFor any information\, write to riccardo.muolo@unamur.be
URL:https://www.naxys.be/event/fnrs-doctoral-school-introduction-to-dynamical-systems-on-complex-networks/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20211216T130000
DTEND;TZID=Europe/Brussels:20211216T140000
DTSTAMP:20260413T203407
CREATED:20210906T095150Z
LAST-MODIFIED:20211203T221526Z
UID:1149-1639659600-1639663200@www.naxys.be
SUMMARY:Jeong Min Jeon (KU Leuven & Université de Namur)
DESCRIPTION:Title: Deconvolution estimation on hypersphere \nThis paper considers nonparametric estimation with contaminated data observed on the unit hypersphere $S^d$. For such data\, we consider deconvolution density estimation and regression analysis. Our methodology and theory are based on harmonic analysis on $S^d$ which is not well considered in statistics. We establish novel deconvolution density and regression estimators\, and study their asymptotic properties including the rates of convergence and asymptotic distributions. We also provide asymptotic confidence intervals. We present practical details on implementation as well as the results of simulation studies and real data analysis. \n\nThe seminar will be online at the following link
URL:https://www.naxys.be/event/jeong-min-jeon-ku-leuven-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Brussels:20211202T130000
DTEND;TZID=Europe/Brussels:20211202T140000
DTSTAMP:20260413T203407
CREATED:20210817T073938Z
LAST-MODIFIED:20211129T215548Z
UID:1062-1638450000-1638453600@www.naxys.be
SUMMARY:Camille Carpentier (Université de Namur)
DESCRIPTION:Title: Using degree distribution of ecological networks to predict their responses to random and targeted species removals \nFacing the current biodiversity crisis\, it is becoming increasingly important to be able to understand – and predict – the consequences of species removal on ecological networks. These complex networks can be described using simple metrics such as the number of species (nodes)\, the number of interactions between them (edges) and their degree distribution. Coupling these three pieces of information allows us to predict the topological impacts of species removal and provides a first tool to identify the most fragile networks and which species removals would be most deleterious. A fundamental step for this approach is to describe the relationship between the number of species and the number of interactions as a network-specific property\, whereas until now ecologists have assumed it as universal. The interaction-species relationship is based on the degree distribution of ecological networks (power-law\, exponential or uniform) could therefore be generalised to other types of complex networks and provide a first understanding of their resistance to node removal. \nThe seminar is in hybrid mode: \n_in person\, Room S08 (Faculty of Sciences) \n_online\, at this link
URL:https://www.naxys.be/event/camille-carpentier-universite-de-namur/
CATEGORIES:NAXYS Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20211118T090000
DTEND;TZID=Europe/Paris:20211118T180000
DTSTAMP:20260413T203407
CREATED:20210703T080537Z
LAST-MODIFIED:20210906T084826Z
UID:1056-1637226000-1637258400@www.naxys.be
SUMMARY:BeNet21 - Belgian Network Research Meeting
DESCRIPTION:  \nThe 10th edition of the Belgian Network Research Meeting (BENet) will be organised by the naXys Institute at the University of Namur (UNamur). The event will be held at the University of Namur on November 18\, 2021. The keynotes speakers\, Ginestra Bianconi (Queen Mary University of London) and Alice C. Schwarze (University of Washington)\, will deliver their talks online. \nThe purpose of this annual event is to foster communication predominantly among Belgian researchers employing network science on their work\, regardless of their discipline: sociology\, economics\, communication\, history\, biology\, physics\, medicine\, computer science\, mathematics and more. \nFor more information\, visit the BENet 2021 page or contact riccardo.muolo@unamur.be.  \nBENet – HOME
URL:https://www.naxys.be/event/benet21-belgian-network-research-meeting/
END:VEVENT
END:VCALENDAR