Suche
Anzeige der Dokumente 131-140 von 161
Buch
Active Learning with Uncertain Annotators
(kassel university press, 2020)
In the digital age, many applications can benefit from collecting data. Classification algorithms, for example, are used to predict the class labels of samples (also termed data points, instances or observations). However, these methods require labeled instances to be trained on. Active learning is a machine learning paradigm where an active learner has to train a model (e.g., a classifier) which is in principle trained in a supervised way. Active learning has to be done by means of a data set where a low fraction ...
Buch
A Comprehensive Approach to Implement Monitoring and State Estimation in Distribution Grids with a Low Number of Measurements
(kassel university press, 2020)
This work addresses the monitoring and state estimation of electrical grids, especially at the distribution grid level. This topic becomes relevant because today’s distribution grids are not always designed for the current expansion of decentralized feed-in, which can lead to congestion within the grid. If congestion is detected by suitable monitoring, it can be resolved by measures, e.g., adjustment of generator power. For economic and technical reasons, however, grid monitoring cannot be implemented with a similarly ...
Buch
Beitrag zur Integration und Analyse sicherheitstechnischer Maßnahmen bei der Entwicklung eines kompletten Rechners auf FPGA-Basis
(kassel university press, 2020)
Die enorm große Marktnachfrage nach Managern für funktionale Sicherheit reflektiert, in welchem Maße die funktionale Sicherheit in den letzten Jahren an Bedeutung gewonnen hat. Wird zwei Dekaden zurückgeschaut, dann ist zu sehen, dass diese Wissenschaft für die Luftfahrt- und Prozessindustrie reserviert war. Heute findet sie den Einsatz in fast allen Industriebranchen. Ihren systematischen und rigorosen Charakter hat die funktionale Sicherheit trotz der signifikanten Modifikationen und Anpassungen nicht verloren. Das ...
Buch
A Holistic, Decision-Theoretic Framework for Pool-Based Active Learning
(kassel university press, 2021)
Efficient labeling is an important topic in machine learning research as classifiers need labeled data. Whereas unlabeled data is easily gathered, labeling is exhausting, time-consuming, or expensive and should, therefore, be reduced to a minimum. Active learning aims to actively select useful, unlabeled instances for label acquisition to reduce the labeling effort while providing labeled training data such that the classifier performs well. This thesis proposes Probabilistic Active Learning, a holistic, decision-theoretic ...
Buch
Einsatz der Lidar-Technik zur Realisierung eines virtuellen Messmastes
(kassel university press, 2021)
Die Windenergie ist eine der wichtigsten Stützen der Energiewende. Für die effiziente Planung eines Windparks ist eine genaue Windmessung zur Bewertung des Windpotenziales eines Standortes im Vorfeld wichtig. Mit dem neuen Erneuerbare-Energien-Gesetz (Abk. EEG) 2021 und der aktuellen Einschränkung der Standorte in Deutschland ist eine genaue Standortbewertung vor allem in komplexen Standorten wichtiger denn je. Die bodenbasierte Wind-Lidar-Technik1 wird in den letzten Jahren für die Windmessungen vermehrt eingesetzt. ...
Buch
Living in territorial solidarity
(kassel university press, 2021)
What we can learn from the Ashaninka from the Amonia River is how they care for flora and fauna in their territory and cooperate in their community in the recultivation of their territory and rely on the wisdom of their elders, on the new communication technologies and on the cooperation in the watershed of the Middle of Jurua River in North-Western Brazilian Amazon with their neighbours.
Indigenous peoples answer to the extreme challenges of resource use and land grabbing by organizing to fight for their territorial ...
Buch
Reactive power grid adequacy studies for distribution grids with high distributed generation
(kassel university press, 2020)
The study aims to develop practicable grid planning procedures for an advanced reactive power management at the transmission-distribution (T-D) interface by making use of controllable reactive power sources at the distribution level, like distributed energy resources (DER) and reactive power compensators. In Germany, also the high voltage level is mainly considered as a part of distribution grid, and the T-D interface is determined at the interface between high voltage and extra high voltage level. A predefined ...
Buch
Advanced theory of optical wave propagation and interferometric sensors for topography measurement
(kassel university press, 2020)
This manuscript provides a compendium for the application of the nonuniform wave model to standard problems of two beam interference and addresses common educational issues associated with wave propagation at attenuating interfaces. It also reports scientific advances in interferometric applications focusing on an interferometric point sensor with optical path length modulation and an areal measuring RGB-interferometer for fast topography measurements in the sub millisecond regime.
Buch
Short Circuit Requirements of Power Converters based upon Wide-Bandgap Semiconductors
(kassel university press, 2021)
In power electronics designs, the evaluation and prediction of potential fault conditions on semiconductors is essential for achieving safe operation and reliability, being short circuit (SC) one of the most probable and destructive among the failures. It can occur externally to the power converter by shortening the load, or internally due to failures on galvanic isolations, stress on passive components, or even in the power semiconductors themselves. Silicon (Si) based power semiconductors have been extensively ...
Buch
Neue Verfahren zur Wirkungsgradbestimmung an Elektrotraktionsmaschinen
(kassel university press, 2020)
Seit vielen Jahren rücken die begrenzten Ressourcen und der Umweltschutz in den Fokus des täglichen Lebens. Die Energiewende hat das langfristige Ziel einer nachhaltigen Energieversorgung mittels erneuerbarer Energien. Um die nachhaltige Energie auch zur Fortbewegung nutzen zu können, entstehen viele Fortbewegungskonzepte, die überwiegend auf elektrischen Antrieben basieren. Dieser Trend wird durch die Politik stark gefördert und von der Masse mit steigender Akzeptanz angenommen. Wegen der hohen Kosten und der ...