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Quantifying the effect of recurrent Rossby wave patterns on extremely hot summers in present-day and end-of-the-century climate
(2021)Extremely hot summers have devastating impacts on society and ecology. Recurrent Rossby wave patterns (RRWPs) are among the atmospheric features that have been linked to extreme weather events involving persistent surface weather. In this thesis, the link between RRWPs and the occurrence of extremely hot summers in the Northern Hemisphere is investigated and quantified. To this aim the synoptic evolution of RRWP events is studied in three ...Master Thesis -
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Boosting Performance Engineering with Visual Interactive Optimization and Analysis
(2021)The increasingly heterogeneous computer architecture landscape makes writing fast and energy efficient scientific high performance computing applications an increasingly complex yet important task. This has given rise to separate performance engineers, designated to optimizing domain scientists’ software to run optimally on different hardware architectures, but interaction between the two roles is complex and inefficient, and tool integration ...Master Thesis -
Delayed deep learning for continuous-time dynamical systems
(2021)Bridging the gap between deep learning and dynamical systems, neural ODEs are a promising approach to model continuous-time dynamical systems. Motivated by state augmentation in discrete-time models, we propose to extend the neural ODE framework to neural delay di erential equations in order to naturally capture non-Markovian e ects such as time delays or hysteresis, which are often encountered in real world applications. We demonstrate ...Master Thesis -
H Robust Control of a Transparent Power-Hardware-in-the-Loop System
(2021)Power-Hardware-in-the-Loop (PHIL) system is a testing infrastructure capable of integrating both the real equipment and highly accurate real-time simulation models of power grids. An interface operating between the hardware and software may face stability and robustness issues, for which many methods, such as the Tramsmission Line Interface (TLI), are developed. This thesis proposes an alternative method of designing the PHIL interface ...Master Thesis -
Analysis and Prediction of Long Term GNSS Height Time Series and Environmental Loading Effects
(2021)GNSS height residuals often exhibit seasonal amplitudes, that can partly be explained by environmental surface loadings, such as hydrological, non-tidal atmospheric and non-tidal oceanic loading. In this thesis the state of the art procedure to reduce the height component of GNSS residuals in Europe by those environmental loadings is evaluated, with a focus on the residual RMS and amplitude reduction. On the one hand, the environmental ...Master Thesis -
Multi-robot extension for safe planning under dynamic uncertainty
(2021)Safe planning problem arises in many applications including autonomous driving and exploration scenarios. In this thesis, we focus on a particular case studied for emergency rescue missions. The main challenge of such problems is the computational complexity of handling a dynamic uncertainty, e.g., a spreading hazard. A multi-agent extension can potentially improve the safety of the mission. However, it further increases the computational ...Master Thesis -
Fidelity Bounds for Device-Independent Advantage Distillation
(2021)Low noise tolerances for current device-independent quantum key distribution protocols and the existence of fidelity-related security conditions in device-independent advantage distillation motivate the need for strong lower bounds on the fidelity. This thesis shows that a reduction to qubits does not deliver optimal bounds. An algorithm is derived that can in principle bound the fidelity for our device-independent setup to an arbitrary ...Master Thesis