| Thursday, October 25, 2018 |
Hannes Stuke (FU Berlin) |
A dynamical systems approach to outlier robust machine learning |
| We deal with a supervised learning in which we want to fit probability distributions of
observed data by artificial neural networks. We introduce the so-called gradient conjugate prior (GCP) update and the induced dynamical system.
We will explain the dynamics of the parameters and show how one can use insights from the dynamical behavior to recover the ground truth distribution in a way
that is more robust against outliers.
This is joint work with Pavel Gurevich.
|
| Thursday, November 1st, 2018 |
| Nicola Vassena (FU Berlin) |
A report from outside world - are we on a shared path or on a lonely path?
|
| Thursday, November 8th, 2018 |
Si Mohamed Sah (Technical University of Denmark) |
Infinite limit cycle bifurcation in a delayed differential equation |
| We investigate the occurrence of a bifurcation, which we term the ``infinite limit cycle bifurcation", or ILCB for short,
in a second order nonlinear DDE (delay-differential equation). When the delay time T>0, no matter how small, an infinite number of limit cycles (LCs) exist,
their amplitude going to infinity as T goes to zero. Perturbation methods are used to approximate the system and investigate the nature of such a bifurcation.
|
| Thursday, November 15th, 2018 |
Maximilian Bee and Hauke Sprink (FU Berlin) |
The ζ-function
|
| Nicola Vassena (FU Berlin) |
A divulgative talk on chemical reaction networks
|
| Thursday, November 22nd , 2018 |
Nicola Vassena |
Bad Children and Good Children |
| This talk can be regarded as a linear algebra one. It is focused on characterization of determinant value for a specific class of matrices. However, this result has strong repercussion in chemical reaction networks,
and specifically on the identification of "bad" child selections, possibly responsible for sign changes in the Jacobian of the system and consequent dynamical implications.
|
| Thursday, November 29th , 2018 |
Ignacio González Betegon (Freie Universität Berlin) |
Exploring genericity results in inverse problems on coupled cell networks |
In a system of ODE's, inverse problems guarantee some behaviour in the hole system by just studying one of the equations.
In this talk we will introduce some symmetry condition to our system of ODE's and we will see how genericity results on inverse problems behave. |
| Nicola Vassena (FU Berlin) |
Bad children and good children |
| For last 30 minutes, I will make some concluding remarks regarding the bipartite graph analysis of my last week's talk. |
| Thursday, December 6th , 2018 |
Nicola Vassena (Freie Universität Berlin) |
Bad children and good children |
Duro a morire, in the first 30 minutes, I will make some concluding remarks regarding the bipartite graph analysis of my talk from two weeks ago. |
| Alejandro López Nieto (Freie Universität Berlin) |
The Chafee-Infante attractor in delay equations |
| In the talk I will present a series of techniques for the study of the global attractor of a delay differential equation.
The main tool is a zero dropping lemma for a class of cyclic monotone feedback systems that endows the studied equation with a Poincaré-Bendixson property, this will allow us to build a (still small)
basis for the systematic construction of global attractors. The talk is rather self-contained, no specific understanding of delay equations is required.
|
| Thursday, December 13th |
Alejandro López Nieto |
The Chafee-Infante attractor in delay equations |
| In the talk I will present a series of techniques for the study of the global attractor of a delay differential equation.
The main tool is a zero dropping lemma for a class of cyclic monotone feedback systems that endows the studied equation with a Poincaré-Bendixson property, this will allow us to build a (still small)
basis for the systematic construction of global attractors. The talk is rather self-contained, no specific understanding of delay equations is required.
|
| Thursday, January 10th |
Babette de Wolff (Freie Universität Berlin) |
Nonlinear control for planar systems with rotational symmetry |
| In this talk, we study time delayed feedback control for planar systems with rotational symmetry. Whereas in the classical Pyragas control scheme the control term is chosen to be linear, we now also allow for nonlinear control terms.
We discuss different classes of noninvasiveness of the control scheme and study how these can help us to overcome obstructions to the success of the control scheme.
|
| Thursday, January 17th |
Isabelle Schneider (Freie Universität Berlin) |
An introduction to state-dependent delay equations |
| Thursday, February 7th |
Yuya Tokuta (Freie Universität Berlin) |
Euglena bioconvection |
| Parabolic equations appear in models of biological systems. Among such, reaction-diffusion equations are known to exhibit macroscopic patterns.
In particular, we will cover a reaction-diffusion system with conservation of mass as a model of Euglena bioconvection under stationary or oscillatory illumination.
We will discuss Turing instability of the system, depending on the illumination settings, and interpret the result.
|
| Thursday, February 14th , 2019 |
Maximilian Bee (Freie Universität Berlin) |
Catastrophic development - an application of the cusp model to psychology |
Ignacio González Betegon (Freie Universität Berlin) |
Exploring the boundaries of genericity on inverse problems in coupled cell networks |
| Ismail Yenilmez (Freie Universität Berlin) |
The Dynamics of Keen’s Model |
Last change: Feb. 21, 2019
