September 2021 - semfis - Mailing lists@ IFISC

Talk on Thursday, Sep 23, 2021 at 12:00
by semfis＠ifisc.uib-csic.es 17 Sep '21

17 Sep '21

Talk on Thursday Sep 23, 2021 at 12:00 Place: Zoom Seminar Title: Deep Randomized Neural Networks Speaker: Claudio Gallicchio, University of Pisa, Italy Abstract: Deep Neural Networks (DNNs) are a fundamental tool in the modern development of Machine Learning. Beyond the merits of the training algorithms, a great part of&nbsp;DNNs success is due to the inherent properties of their layered architectures, i.e., to the introduced architectural biases. This talk explores recent classes of DNN models in which&nbsp;the majority of connections are untrained, i.e., randomized or more generally fixed according to some specific heuristic.&nbsp; Limiting the training algorithms to operate on a reduced set of weights implies intriguing features. Among them, the extreme efficiency of the learning processes is undoubtedly a&nbsp;striking advantage with respect to fully trained counterparts. Besides, despite the involved simplifications, randomized neural systems possess remarkable properties both in&nbsp;practice, achieving state-of-the-art results in multiple domains, and theoretically, allowing us to analyze intrinsic properties of neural architectures. This talk will cover the major aspects regarding Deep Randomized Neural Networks, with a particular focus on Deep Reservoir Computers for time-series and graphs. &nbsp; Link Zoom:&nbsp;<a href="https://uibuniversitat.zoom.us/j/83043347066">https://uibuniversitat.zoom.us/j/83043347066</a> Url event:https://ifisc.uib-csic.es/en/events/seminars/deep-randomized-neural-networks/

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Reminder: IFISC Seminar, TODAY - Wednesday, Sep 15, 2021 at 14:30
by semfis＠ifisc.uib-csic.es 15 Sep '21

15 Sep '21

IFISC Seminar on Wednesday Sep 15, 2021 at 14:30 Place: Zoom Seminar Title: Unraveling the role of node metadata in network robustness: the feature-based percolation model Speaker: Oriol Artime, Fondazione Bruno Kessler Abstract: Percolation is an emblematic model to assess the robustness of interconnected systems when some of their components are corrupted. It is usually investigated in simple scenarios, such as the removal of the system&#39;s units in random order, or sequentially ordered by specific topological descriptors, such as the degree or the betweenness. However, in the vast majority of empirical applications, it is required to dismantle the network following more sophisticated protocols, for instance, by combining topological properties and non-topological node metadata. In this seminar I will introduce a novel mathematical framework that fills this gap: networks are enriched with features and their nodes are removed according to the importance in the feature space. We will discuss features of different nature, from ones related to the network construction to ones related to dynamical processes such as epidemic spreading. In this way, we not only provide a natural generalization o f percolation but, more importantly, this framework offers an accurate way to test the robustness of networks in realistic scenarios. More information can be found at https://www.nature.com/articles/s41467-021-22721-z. Zoom: <a href="https://us02web.zoom.us/j/83829318876?pwd=Z2pqbUtIMEV3NUQvU0hpakp0NGtsUT09">https://us02web.zoom.us/j/83829318876?pwd=Z2pqbUtIMEV3NUQvU0hpakp0NGtsUT09</a> Url event:https://ifisc.uib-csic.es/en/events/seminars/unraveling-the-role-of-node-metadata-in-network-ro/

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Reminder: Talk, TODAY - Tuesday, Sep 14, 2021 at 12:00
by semfis＠ifisc.uib-csic.es 14 Sep '21

14 Sep '21

Talk on Tuesday Sep 14, 2021 at 12:00 Place: Zoom Seminar Title: The role of bistability and time delay in the coordination of the cell cycle Speaker: Jan Rombouts, KU Leuven Abstract: The cell division cycle is an important biological process, essential for the development and survival of all organisms. The eukaryotic cell cycle is controlled by an intricate network of genes and proteins, which can be described by mathematical equations. These mathematical models describe how the concentrations of the different components of the control network change over time and in space. In the cell cycle, these concentrations rise and fall periodically, each oscillation corresponding to one cycle. Moreover, in spatially extended systems, traveling waves of protein activity can be observed, which play a role in synchronizing the cell cycle in large cells. In this talk, I will discuss how bistability and time delay generate oscillations and traveling waves, and how these features are important in the coordination of the cell division cycle. &nbsp; Join Zoom Meeting https://uibuniversitat.zoom.us/j/82991503232 &nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/the-role-of-bistability-and-time-delay-in-the-coor/

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Talk on Tuesday, Sep 14, 2021 at 12:00
by semfis＠ifisc.uib-csic.es 10 Sep '21

10 Sep '21

Talk on Tuesday Sep 14, 2021 at 12:00 Place: Zoom Seminar Title: The role of bistability and time delay in the coordination of the cell cycle Speaker: Jan Rombouts, KU Leuven Abstract: The cell division cycle is an important biological process, essential for the development and survival of all organisms. The eukaryotic cell cycle is controlled by an intricate network of genes and proteins, which can be described by mathematical equations. These mathematical models describe how the concentrations of the different components of the control network change over time and in space. In the cell cycle, these concentrations rise and fall periodically, each oscillation corresponding to one cycle. Moreover, in spatially extended systems, traveling waves of protein activity can be observed, which play a role in synchronizing the cell cycle in large cells. In this talk, I will discuss how bistability and time delay generate oscillations and traveling waves, and how these features are important in the coordination of the cell division cycle. &nbsp; Join Zoom Meeting https://uibuniversitat.zoom.us/j/82991503232 &nbsp; Url event:https://ifisc.uib-csic.es/en/events/seminars/the-role-of-bistability-and-time-delay-in-the-coor/

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IFISC Seminar on Wednesday, Sep 15, 2021 at 14:30
by semfis＠ifisc.uib-csic.es 10 Sep '21

10 Sep '21

IFISC Seminar on Wednesday Sep 15, 2021 at 14:30 Place: Zoom Seminar Title: Unraveling the role of node metadata in network robustness: the feature-based percolation model Speaker: Oriol Artime, Fondazione Bruno Kessler Abstract: Percolation is an emblematic model to assess the robustness of interconnected systems when some of their components are corrupted. It is usually investigated in simple scenarios, such as the removal of the system&#39;s units in random order, or sequentially ordered by specific topological descriptors, such as the degree or the betweenness. However, in the vast majority of empirical applications, it is required to dismantle the network following more sophisticated protocols, for instance, by combining topological properties and non-topological node metadata. In this seminar I will introduce a novel mathematical framework that fills this gap: networks are enriched with features and their nodes are removed according to the importance in the feature space. We will discuss features of different nature, from ones related to the network construction to ones related to dynamical processes such as epidemic spreading. In this way, we not only provide a natural generalization o f percolation but, more importantly, this framework offers an accurate way to test the robustness of networks in realistic scenarios. More information can be found at https://www.nature.com/articles/s41467-021-22721-z. Zoom: <a href="https://us02web.zoom.us/j/83829318876?pwd=Z2pqbUtIMEV3NUQvU0hpakp0NGtsUT09">https://us02web.zoom.us/j/83829318876?pwd=Z2pqbUtIMEV3NUQvU0hpakp0NGtsUT09</a> Url event:https://ifisc.uib-csic.es/en/events/seminars/unraveling-the-role-of-node-metadata-in-network-ro/

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Reminder: Master Thesis, TODAY - Wednesday, Sep 08, 2021 at 10:30
by semfis＠ifisc.uib-csic.es 08 Sep '21

08 Sep '21

Master Thesis on Wednesday Sep 08, 2021 at 10:30 Place: IFISC Seminar Room Title: Cell Migration in Cancer Metastasis Speaker: Marta Pedrosa García-Moreno, Student of the Master in Physics of Complex Systems Abstract: Cancer metastasis is the process in which cancerous cells detach from the primary tumour in order to spread through the rest of the organism to finally proliferate in distant organs. Detached cancerous cells are able to travel thanks to their success of overcoming the different barriers our body has in the diverse stages of the spreading process. Firstly, cells detach from the primary tumour and traverse the extracellular matrix (ECM), which is the complex 3D interconnected network of macromolecules that surround and support cells within organs and tissues.&nbsp;Once this traverse is done, cells are able to reach a blood vessel, from where they travel through the blood circulation system until they leave it, entering a new organ, proliferating there and forming a secondary tumour. In this Master Thesis we explore the ability of a tumour cell to spread through the ECM under different concentrations of collagen fibers. Cells behave as active Brownian particles and its dynamics is modelled using a cellular Potts model. Url event:https://ifisc.uib-csic.es/en/events/seminars/cell-migration-in-cancer-metastasis/

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Master Thesis on Wednesday, Sep 08, 2021 at 10:30
by semfis＠ifisc.uib-csic.es 03 Sep '21

03 Sep '21

Master Thesis on Wednesday Sep 08, 2021 at 10:30 Place: Zoom Seminar Title: Cell Migration in Cancer Metastasis Speaker: Marta Pedrosa García-Moreno, Student of the Master in Physics of Complex Systems Abstract: Cancer metastasis is the process in which cancerous cells detach from the primary tumour in order to spread through the rest of the organism to finally proliferate in distant organs. Detached cancerous cells are able to travel thanks to their success of overcoming the different barriers our body has in the diverse stages of the spreading process. Firstly, cells detach from the primary tumour and traverse the extracellular matrix (ECM), which is the complex 3D interconnected network of macromolecules that surround and support cells within organs and tissues.&nbsp;Once this traverse is done, cells are able to reach a blood vessel, from where they travel through the blood circulation system until they leave it, entering a new organ, proliferating there and forming a secondary tumour. In this Master Thesis we explore the ability of a tumour cell to spread through the ECM under different concentrations of collagen fibers. Cells behave as active Brownian particles and its dynamics is modelled using a cellular Potts model. Url event:https://ifisc.uib-csic.es/en/events/seminars/cell-migration-in-cancer-metastasis/

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Reminder: Talk, TODAY - Wednesday, Sep 01, 2021 at 12:00
by semfis＠ifisc.uib-csic.es 01 Sep '21

01 Sep '21

Talk on Wednesday Sep 01, 2021 at 12:00 Place: Zoom Seminar Title: THE PROPAGATION OF SARS-CoV-2 VARIANTS IN ENGLAND: interplay between social dynamics and epidemiological features Speaker: Beatriz Arregui García, IFISC (CSIC-UIB) Abstract: Abstract: Many efforts have been globally made since the beginning of 2020 against the COVID-19 epidemic. Nevertheless, the virus has further propagated and, as any other virus, it has mutated over time. Many of these mutations don&#39;t imply any substantial alteration in the epidemic spreading. However, some mutations may change part of the virus&#39;s properties such as the infectivity or the severity of the disease leading to chances in its spreading. Those mutations leading to a major impact on public health have been denominated as Variants of Interest (VOIs) and Variants of Concern (VOCs). Large-scale sequencing of SARS-CoV-2 in England allowed us to analyse the spreading of the different variants since September 2020. During this period two VOCs have prevailed over the other mutations. We study the social dynamics by measuring how travel policies and lockdowns affect human mobility. In a second part we use a classical diffusion model based on effective distances in order to relate human mobility with the spreading and reconstruct the epidemic: determine arrival times, the outbreak location of each variant and also their spreading speed. Classical methods to understand global disease dynamics appear not to be sufficient to capture the complexity of the system where non pharmaceutical interventions, vaccination programs and genomic variations interplay between each other. The talk will be online at the link: https://uibuniversitat.zoom.us/j/82507484417</… Url event:https://ifisc.uib-csic.es/en/events/seminars/the-propagation-of-sars-cov-2-variants-in-england/

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