- semfis - Mailing lists@ IFISC

IFISC Seminar on Wednesday, Feb 01, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 27 Jan '23

27 Jan '23

IFISC Seminar on Wednesday Feb 01, 2023 at 14:30 Place: IFISC Seminar Room Title: Beyond simple dynamics: coevolutionary dynamics Speaker: Alessio Cardillo, UOC Abstract: Abstract: For years, simple models have been used successfully to describe a plethora of phenomena taking place in complex systems. For instance, models like the Kuramoto model or the Prisoner&#39;s Dilemma game have been used as paradigms to study the emergence of synchronization and cooperation in populations of elements interacting with each other. Despite the achievements of the reductionist approach, there is a whole set of problems/phenomena that cannot be tackled/understood in terms of a single (simple) type of dynamical process. For instance, the spontaneous adoption of vaccines cannot be fully understood if we model it as a mere response to a cost over benefit analysis. To address more complex phenomena, we need to move beyond simple dynamical processes by intertwining two (or more) of them together using a coevolutionary approach. In this talk, I will present some examples of coevolutionary dynamics models and show how the phenomenology observed combining two dynamical processes together is, quoting Anderson&#39;s famous motto,&nbsp;&quot;more than the sum of its parts&quot; which constitutes one of the hallmarks of complexity. Presential in the seminar room with parallel Zoom stream at:&nbsp;https://us06web.zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/beyond-simple-dynamics-coevolutionary-dynamics/

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Talk on Thursday, Feb 02, 2023 at 12:00
by semfis＠ifisc.uib-csic.es 27 Jan '23

27 Jan '23

Talk on Thursday Feb 02, 2023 at 12:00 Place: IFISC Seminar Room Title: Balearic power grid stability in scenarios with large photovoltaic generation Speaker: María Martínez-Barbeito, IFISC (UIB-CSIC) Abstract: The first step in the decarbonization agenda of the Balearic Islands was to close down a coal fired power plant in December 2019. In the upcoming years, the following steps will be to integrate a higher share of solar photovoltaic generation. In this talk, I will analyze the frequency fluctuations and the overall grid stability in such scenarios. I will also analyze the role of the High Voltage Direct Current (HVDC) link with mainland Spain in the control requirements needed to ensure grid stability. https://uibuniversitat.zoom.us/j/94682807892 Url event:https://ifisc.uib-csic.es/en/events/seminars/balearic-power-grid-stability-in-scenarios-with-la/

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Talk on Friday, Feb 03, 2023 at 15:00
by semfis＠ifisc.uib-csic.es 27 Jan '23

27 Jan '23

Talk on Friday Feb 03, 2023 at 15:00 Place: IFISC Seminar Room Title: Interacting particle systems with mobility and demographic dynamics as biological models Speaker: Alejandro Almodovar, IFISC Abstract: The behaviour of active matter has been intensively investigated in the last decades partly because of its many applications to living systems. In this work, we add stochastic birth-death dynamics to a system of particles with volume exclusion. This is a simple, but general biological ingredient which has not been studied in detail before. The number of particles in the system at long times depends on the birth and death rates, and on a parameter characterising the activity. We find liquid, solid and hexatic phases in the absence of activity. Which one of these phases is realised depends on the birth and death rates. When self-propulsion &nbsp;is considered, we also observe these phases depending on the activity. we will also analyse what happens when there are two types of particles of different sizes. We will study the conditions to find coexistence. Finally, we will show preliminary results when the rates of birth and death are modified by a voter-like interaction, I.e., the demographic rate of each particle depends on those on the surrounds. Presential in the IFISC seminar room, Zoom stream at&nbsp;https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/interacting-particle-systems-with-mobility-and-d-2/

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Reminder: Talk, TODAY - Friday, Jan 27, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 27 Jan '23

27 Jan '23

Talk on Friday Jan 27, 2023 at 11:00 Place: IFISC Seminar Room Title: Maximum Lyapunov Exponent for Temporal Networks Speaker: Annalisa Caligiuri, IFISC Abstract: <pre style="text-align:left"> By interpreting a temporal network as a trajectory of a latent graph dynamical system, here we introduce the concept of dynamical instabil- ity of a temporal network, and accordingly derive a measure to estimate the network Maximum Lyapunov Exponent (nMLE) of a temporal net- work trajectory. By building and extending classical algorithmic methods from nonlinear time series analysis into the network realm, we show how to quantify sensitive dependence on initial conditions and practi- cally estimate the nMLE directly from single network trajectories. We validate our method for a range of synthetic generative network models and discuss its applicability in formulating and answering new questions on the chaotic nature of interacting systems in different disciplines. </pre> Url event:https://ifisc.uib-csic.es/en/events/seminars/maximum-lyapunov-exponent-for-temporal-networks/

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Reminder: IFISC Seminar, TODAY - Wednesday, Jan 25, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 25 Jan '23

25 Jan '23

IFISC Seminar on Wednesday Jan 25, 2023 at 14:30 Place: IFISC Seminar Room Title: Metaplex networks: influence of the exo-endo structure of complex systems on diffusion Speaker: Gissell Estrada, University of Oxford Abstract: In this talk I will introduce the concept of metaplexes and the dynamical systems on them. A metaplex combines the internal structure of the entities of a complex system with the discrete interconnectivity of these entities in a global topology. We focus here on the study of diffusive processes on metaplexes, both model and real-world examples. We provide theoretical and computational evidence pointing out the role of the endo- and exo-structure of the metaplexes in their global dynamics, including the role played by the size of the nodes, the location of sinks and sources, and the strength and range of the coupling between nodes. We show that the internal structure of brain regions (corresponding to the nodes of the network) in the macaque visual cortex metaplex dominates almost completely the global dynamics. On the other hand, in the linear metaplex chain and the landscape metaplex the diffusion dynamics display a combination of the endo- and exo-dynamics, which we ex plain analytically and in numerical results. Metaplexes are expected to facilitate the understanding of complex systems in an integrative way, which combine dynamical processes inside the nodes and between them. Presential in the IFISC seminar room, Zoom stream at&nbsp; https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/metaplex-networks-influence-of-the-exo-endo-struct/

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IFISC Seminar on Wednesday, Jan 25, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 20 Jan '23

20 Jan '23

IFISC Seminar on Wednesday Jan 25, 2023 at 14:30 Place: IFISC Seminar Room Title: Metaplex networks: influence of the exo-endo structure of complex systems on diffusion Speaker: Gissell Estrada, University of Oxford Abstract: In this talk I will introduce the concept of metaplexes and the dynamical systems on them. A metaplex combines the internal structure of the entities of a complex system with the discrete interconnectivity of these entities in a global topology. We focus here on the study of diffusive processes on metaplexes, both model and real-world examples. We provide theoretical and computational evidence pointing out the role of the endo- and exo-structure of the metaplexes in their global dynamics, including the role played by the size of the nodes, the location of sinks and sources, and the strength and range of the coupling between nodes. We show that the internal structure of brain regions (corresponding to the nodes of the network) in the macaque visual cortex metaplex dominates almost completely the global dynamics. On the other hand, in the linear metaplex chain and the landscape metaplex the diffusion dynamics display a combination of the endo- and exo-dynamics, which we explain analytically and in numerical results. Metaplexes are expected to facilitate the understanding of complex systems in an integrative way, which combine dynamical processes inside the nodes and between them. Presential in the IFISC seminar room, Zoom stream at&nbsp;https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/metaplex-networks-influence-of-the-exo-endo-struct/

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Talk on Friday, Jan 27, 2023 at 11:00
by semfis＠ifisc.uib-csic.es 20 Jan '23

20 Jan '23

Talk on Friday Jan 27, 2023 at 11:00 Place: IFISC Seminar Room Title: Maximum Lyapunov Exponent for Temporal Networks Speaker: Annalisa Caligiuri, IFISC Abstract: <pre style="text-align:left"> By interpreting a temporal network as a trajectory of a latent graph dynamical system, here we introduce the concept of dynamical instabil- ity of a temporal network, and accordingly derive a measure to estimate the network Maximum Lyapunov Exponent (nMLE) of a temporal net- work trajectory. By building and extending classical algorithmic methods from nonlinear time series analysis into the network realm, we show how to quantify sensitive dependence on initial conditions and practi- cally estimate the nMLE directly from single network trajectories. We validate our method for a range of synthetic generative network models and discuss its applicability in formulating and answering new questions on the chaotic nature of interacting systems in different disciplines. </pre> Url event:https://ifisc.uib-csic.es/en/events/seminars/maximum-lyapunov-exponent-for-temporal-networks/

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Reminder: Talk, TODAY - Thursday, Jan 19, 2023 at 08:00
by semfis＠ifisc.uib-csic.es 19 Jan '23

19 Jan '23

Talk on Thursday Jan 19, 2023 at 08:00 Place: Salón de Actos Hospital Son Espases, planta 1, módulo L Title: IFISC: El potencial de la IA y los sistemas complejos en el sector salud Speaker: Claudio Mirasso, IFISC Abstract: <ol> <li>Presentaci&oacute;n del IFISC</li> <li>Proyectos desarrollados por investigadores del IFISC en el &aacute;mbito m&eacute;dico. <ol style="list-style-type:lower-alpha"> <li>Proyectos sobre gesti&oacute;n sanitaria</li> <li>Proyectos de an&aacute;lisis de datos biom&eacute;dicos y modelado </li> <li>Proyectos de propagaci&oacute;n de enfermedades y movilidad humana</li> <li>Proyectos que se han desarrollado conjuntamente con HUSE</li> </ol> </li> <li>Oportunidades de colaboraci&oacute;n en el &aacute;mbito de an&aacute;lisis de datos e IA</li> </ol> Presential in Son Espases Online: &lt;<a href="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OTc4NGM0Z… style="font-family:&quot;Noto Sans&quot;,sans-serif; font-size:10.0pt">https://teams.microsoft.com/l/meetup-join/19%3ame… style="color:black; font-family:&quot;Noto Sans&quot;,sans-serif; font-size:10.0pt">&gt;&nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/ifisc-el-potencial-de-la-ia-y-los-sistemas-complej/

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Reminder: IFISC Colloquium, TODAY - Wednesday, Jan 18, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 18 Jan '23

18 Jan '23

IFISC Colloquium on Wednesday Jan 18, 2023 at 14:30 Place: IFISC Seminar Room Title: Bounded Confidence: A deceptively simple model Speaker: Rainer Hegselmann, University of Bayreuth and Frankfurt School of Finance & Management Abstract: My talk will discuss the so called bounded confidence model (BC-model, for short).&nbsp;The model is very simple: Period by period, all agents average over all opinions that are not further away&nbsp;from their actual opinion than a given distance&nbsp;Epsilon, their `bound of confidence&lsquo;.&nbsp;The simplicity of the model is deceptive. Two decades ago, Ulrich Krause and I&nbsp;published an&nbsp;analysis of the model in which we overlooked completely a decisive feature of our model:&nbsp;For increasing values of Epsilon, our analysis back then suggests smooth transitions in the model&rsquo;s behavior.&nbsp;But in fact, the transitions are wild, chaotic, and non-monotonic. In my talk I will present a completely novel approach&nbsp;to analyse the BC-model. In the new approach everything we overlooked at the time becomes directly obvious&nbsp;and, in a sense, unmissable. Presential in the IFISC seminar room, Zoom stream at&nbsp;https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/bounded-confidence-a-deceptively-simple-model/

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IFISC Colloquium on Wednesday, Jan 18, 2023 at 14:30
by semfis＠ifisc.uib-csic.es 13 Jan '23

13 Jan '23

IFISC Colloquium on Wednesday Jan 18, 2023 at 14:30 Place: IFISC Seminar Room Title: Bounded Confidence: A deceptively simple model Speaker: Rainer Hegselmann, University of Bayreuth and Frankfurt School of Finance & Management Abstract: My talk will discuss the so called bounded confidence model (BC-model, for short).&nbsp;The model is very simple: Period by period, all agents average over all opinions that are not further away&nbsp;from their actual opinion than a given distance&nbsp;Epsilon, their `bound of confidence&lsquo;.&nbsp;The simplicity of the model is deceptive. Two decades ago, Ulrich Krause and I&nbsp;published an&nbsp;analysis of the model in which we overlooked completely a decisive feature of our model:&nbsp;For increasing values of Epsilon, our analysis back then suggests smooth transitions in the model&rsquo;s behavior.&nbsp;But in fact, the transitions are wild, chaotic, and non-monotonic. In my talk I will present a completely novel approach&nbsp;to analyse the BC-model. In the new approach everything we overlooked at the time becomes directly obvious&nbsp;and, in a sense, unmissable. Presential in the IFISC seminar room, Zoom stream at&nbsp;https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09 Url event:https://ifisc.uib-csic.es/en/events/seminars/bounded-confidence-a-deceptively-simple-model/

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