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Academic literature on the topic 'Rekurrent neural networks'
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Dissertations / Theses on the topic "Rekurrent neural networks"
Freitag, Steffen, Wolfgang Graf, and Michael Kaliske. "Prognose des Langzeitverhaltens von Textilbeton-Tragwerken mit rekurrenten neuronalen Netzen." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244048026002-79164.
Full textBernardi, Davide. "Detecting Single-Cell Stimulation in Recurrent Networks of Integrate-and-Fire Neurons." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20560.
Full textThis thesis is a first attempt at developing a theoretical model of the experiments which show that the stimulation of a single cell in the cortex can trigger a behavioral reaction and that challenge the common belief that many neurons are needed to reliably encode information. As a starting point of the present work, one neuron selected at random within a random network of excitatory and inhibitory integrate-and-fire neurons is stimulated. One important goal of this thesis is to seek a readout scheme that can detect the single-cell stimulation in a plausible way with a reliability compatible with the experiments. The first readout scheme reacts to deviations from the spontaneous state in the activity of a readout population. When the choice of readout neurons is sufficiently biased towards those receiving direct links from the stimulated cell, the stimulation can be detected. In the second part of the thesis, the readout scheme is extended by employing a second network as a readout circuit. Interestingly, this new readout scheme is not only more plausible, but also more effective. These results are based both on numerical simulations of the network and on analytical approximations. Further experiments showed that the probability of the behavioral reaction is substantially independent of the length and intensity of the stimulation, but it increases when an irregular current is used. The last part of this thesis seeks a theoretical explanation for these findings. To this end, a recurrent network including more biological details of the system is considered. Furthermore, the functioning principle of the readout is modified to react to changes in the activity of the local network (a differentiator readout), instead of integrating the input. This differentiator readout yields results in accordance with the experiments and could be advantageous in the presence of nonstationarities.
Almosova, Anna. "Essays on monetary macroeconomics." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19978.
Full textThis thesis addresses three topics that are relevant for the central bank policy design. It analyzes forecasting of the macroeconomic time series, accurate monetary policy formulation in a general equilibrium macroeconomic model and monitoring of the novel developments in the monetary system. All these issues are analyzed in a nonlinear framework with the help of a macroeconomic model. The first part of the thesis shows that nonlinear recurrent neural networks – a method from the machine learning literature – outperforms the usual benchmark forecasting models and delivers accurate inflation predictions for 1 to 12 months ahead. The second part of the thesis analyzes a nonlinear formulation of the Taylor rule. With the help of the nonlinear Bayesian estimation of a DSGE model it shows that the Taylor rule in the US is asymmetric. The central bank reacts stronger to inflation when it is above the target than when it is below the target. Similarly, the reaction to the output growth rate is stronger when the output growth is too weak than when it is too strong. The last part of the thesis develops a theoretical model that is suitable for the analysis of decentralized digital currencies. The model is used to derive the conditions, under which the competition between digital and fiat currencies imposes restrictions on the monetary policy design.
Hild, Manfred. "Neurodynamische Module zur Bewegungssteuerung autonomer mobiler Roboter." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2008. http://dx.doi.org/10.18452/15700.
Full textHow recurrent neural networks can help to make autonomous robots move, will be investigated within this thesis. First, oscillators which are able to control four-legged robots will be dealt with, then homeostatic ring modules which control segmented robots, and finally monostable neural modules, which are able to drive complex motion sequences on robots with many degrees of freedom will be focused upon. The mathematical theory of neural modules will be addressed as well as their practical implementation on real robot platforms. This includes their embedding into a major framework and concrete aspects, like computational accuracy, timing and dependance on materials. Details on electronics will be given, so that individual robot systems can be built and equipped with an appropriate motion controller. It is another concern of this thesis, to shed a new light on the theory of recurrent neural networks, from the perspective of classical engineering science. Selective comparisons to analog electronic schematics, physical models, and digital signal processing algorithms can ease the understanding of neural dynamics.
Hornstein, Alexander. "Dynamical modeling with application to friction phenomena." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B57E-4.
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