Universität Stuttgart

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Institute: search.filters.UBSInstitut.Fakultätsübergreifend / Sonstige EinrichtungPublication Type: search.filters.UBSTyp.Abschlussarbeit (Master)

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    Exploring classification algorithms and data feature selection for domain specific industrial text data
    (2016) Villanueva Zacarías, Alejandro Gabriel
    Unstructured text data represents a valuable source of information that nonetheless remains sub utilised due to the lack of efficient methods to manipulate it and extract insights from it. One example of such deficiencies is the lack of suitable classification solutions that address the particular nature of domain-specific industrial text data. In this thesis we explore the factors that impact the performance of classification algorithms, as well as the properties of domain-specific industrial text data, to propose a framework that guides the design of text classification solutions that can achieve an optimal trade-off between accuracy and processing time. Our research model investigates the effect that the availability of data features has on the observed performance of a classification algorithm. To explain this relationship, we build a series of prototypical Naïve Bayes algorithm configurations out of existing components and test them on two role datasets from a quality process of an automotive company. A key finding is that properly designed feature selection techniques can play a major role in achieving optimal performance both in terms of accuracy and processing time by providing the right amount of meaningful features. We test our results for statistical significance, proceed to suggest an optimal solution for our application scenario and conclude by describing the nature of the variable relationships contained in our research model.
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    Measuring apparent flow vector on a flexible wing kite
    (2017) Oehler, Johannes
    The master thesis deals with an airborne wind energy system, a new technology to harvest wind energy. In order to use flexible wing kites effectively in power generation, their size must be increased and aerodynamic performance should be systematically improved. To this end, validated models to predict the behavior of future kite designs are essential. The biggest uncertainty in current modeling approaches appears in the air flow experienced by the kite. This thesis develops a measurement setup for the apparent flow vector. An air data boom with a Pitot-static tube and two wind vanes is used to sense the relative flow directly below the kite. The acquired data is validated and shows that high-quality in-situ measurements of relative flow information are possible using the presented airborne setup.