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Complex Systems and Nonlinear Dynamics
Group seminar

Group seminar

Our group seminar takes place on Thursday at 15:30 in room 2/P033 in the physics building (see Google Maps). Subject to change.


April 11, 2019
Dr. Andreas Otto (TU Chemnitz)

Data analysis using Wavelet Transform and Empirical Mode Decomposition


April 18, 2019
David Müller-Bender, M. Sc. (TU Chemnitz)

Resonant Doppler effect in systems with variable delay


April 25, 2019
Dr. Tony Albers; Dr. Andreas Otto (TU Chemnitz)

Journal Club


May 2, 2019
Paul Zech, M. Sc.; David Müller-Bender, M. Sc. (TU Chemnitz)

Journal Club


May 9, 2019

13:30, P031

Lukas Seemann, B. Sc. (TU Chemnitz)

Stability analysis of a haptic device


May 16, 2019
Lukas Hille (TU Chemnitz)

Diffusion in time-delay systems with dissipative delay


May 23, 2019
Dr. Andreas Otto (TU Chemnitz)

Time delay effects in the control of synchronous electricity grids

Abstract

In the course of the ’Energiewende’, highly volatile energy sources (i.e. wind and photovoltaics) will be introduced to a system built with conventional energy sources in mind, while removing conventional generation. Removing conventional generation facilities and replacing them with fluctuating renewable generation that do not provide inertia could make the system vulnerable to disturbances. Control mechanisms can only be employed by accurately measuring the system state (i.e. frequencies and load flows) and correctly communicating these values. The delay associated with the measurement, communication and deployment of control might play an increasingly important role in a system that relies on strongly fluctuating feed-in. The control mechanisms used at the moment are integrated into a model of coupled oscillators which resembles the second order Kuramoto model. This model is used to investigate the behavior of the interconnected electricity grid. To identify regions in parameter space that make stable grid operation possible, the linearized system is analyzed to create the system’s stability chart. We show that lower and distributed inertia could have a beneficial effect on the stability of the desired synchronous state.


June 13, 2019
Dr. Tony Albers (TU Chemnitz)

Hidden Markov Dynamics of Diffusing Dissipative Solitons


June 20, 2019
Paul Zech, M. Sc. (TU Chemnitz)

Linearized Dynamics For Systems With Hysteresis


June 27, 2019

13:30, P031

Lukas Seemann, B. Sc. (TU Chemnitz)

Stability analysis of a haptic device


July 4, 2019
Dr. Karsten Schwalbe (FusionSystems GmbH)

Neuronale Netze zur Semantischen Segmentierung

Abstract

Neuronale Netze haben sich in den letzten Jahren als mächtiges Werkzeug zur Bearbeitung von Problemstellungen aus sämtlichen Bereichen des modernen Lebens herauskristallisiert. Sie erkennen selbstständig Gesichter, malen Bilder, komponieren Musik, führen Unterhaltungen und erfinden neue Medikamente. Ihren Erfolgszug verdanken sie zum einen der immens gewachsenen Rechenleistung, zum anderen der zunehmenden Verfügbarkeit von Daten, die als Lernbasis für derartige Netze dienen. Im Vortrag wird eine kurze Übersicht über die Anwendungsfelder und die Funktionsweise von Neuronalen Netzen gegeben. Im Anschluss werden die sogenannten Convolutional Neuronalen Netze vorgestellt, welche vor allem der automatischen Objekterfassung dienen. Anhand des Beispiels Fahrzeugumfelderkennung werden grundlegende Konzepte verständlich erläutert und aktuelle Herausforderungen diskutiert.

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