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Dissertation
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Towards Effective Natural Language Application Development
(2019)
There is a current trend that more and more computer programs analyze written or spoken natural language. For example, DVAs, IE systems, machine translation systems, and many other types of programs process natural language in order to solve specific use cases when interacting with humans via natural language. Amazon, Google, and Mycroft AI are just some of the companies that have produced DVAs capable of interacting with humans via voice. Such NLP applications use techniques from computer science and artificial ...
Dissertation
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Analyzing Given Names
(2020)
Computer science has evolved so much that it influences almost every part of human live. A particularly personal part of human live is the selection of a given name for a newborn baby. The name discovery service Nameling is our way to help expectant parents with this decision. It is a web service that helps parents to find a given name for their newborn baby. We want to further improve the user experience of Nameling by personalizing its name results for the current user. We deem this important, because the selection ...
Dissertation
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Discovering Knowledge in Bipartite Graphs with Formal Concept Analysis
(2019)
Since the 1970s knowledge based approaches are a crucial part of artificial intelligence (AI) research. In this work we investigate data sets in the form of bipartite graphs, i.e., graphs where a bipartition of the vertex set respecting the edge set can be found, for knowledge. To this end we first relate those bipartite graphs to the structure formal context, as used in formal concept analysis (FCA). This link enables us to employ the whole tool-set of FCA to bipartite graphs and therefore, notably, to bipartite ...
Dissertation
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Beitrag zur Betrachtung des Einflusses der Anforderungen auf die Hazard-Rate unter besonderer Berücksichtigung des Zusammenhangs zwischen Anforderungsrate, Ausfallrate, Probability of Dangerous Failure on Demand, Probability of Dangerous Failure per Hour und Hazard-Rate
(2015)
Durch die Digitalisierung verstärkt sich der Einsatz von komplexen elektronischen Systemen. Diese Systeme müssen sowohl gesetzlich und normativ geforderte Sicherheitsaspekte erfüllen als auch betriebswirtschaftlich ihre Rendite durch Verfügbarkeit erzielen. Einhergehend mit der Komplexität steigen die Anforderungen an Zuverlässigkeit, Sicherheit und Verfügbarkeit für das Gesamtsystem bestehend aus dem zu überwachenden System und dem Sicherheitssystem.
In dieser Monographie werden Erweiterungen von existierenden ...
Dissertation
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Planning of Autonomous and Mobile Robots in Dynamic Environments
(2018-11)
The capabilities of autonomous robots are increasing which is a reason for research progress
in the last years. An increasing number of robotic scenarios are becoming more viable in
various domains for example, mowing, harvesting, warehouse robots. But autonomous
mobile robots need more than the ability to navigate through their world, and manipulate
objects. Even in teams of robots, a structured plan for each team member is necessary.
Planning becomes a more important task. Furthermore, the environment can ...
Dissertation
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Fehlertoleranz und Elastizität für ein Framework zur globalen Lastenbalancierung
(2018-09-10)
Die Anzahl an Rechenknoten in Hochleistungsrechnern wächst stetig. In solchen Systemen nimmt die Bedeutung von Fehlertoleranz zu, da die Wahrscheinlichkeit eines permanenten Knotenausfalls ebenfalls stetig wächst.
Fehlertoleranz gegenüber permanenten Knotenausfällen wird typischerweise durch Checkpointing auf Systemebene realisiert. Findet das Checkpointing jedoch auf Anwendungsebene statt, können Laufzeitvorteile erzielt werden. Diese Implementierungen sind allerdings zeitintensiv und fehleranfällig. Anwendungen, ...
Dissertation
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Extremal Fixpoints for Higher-Order Modal Logic
(2018-10)
In this dissertation, we investigate the interplay between extremal fixpoints and higher-order constructs. The main Focus here is Higher-Order Modal Fixpoint Logic (HFL), an extension of the modal mu-calculus by a simply typed lambda calculus. The resulting logic is very expressive, yet the interplay of its components has not been systematically investigated so far. Goal of this thesis is to characterize the interplay of the components of HFL.
A first characterization is given by converting the denotational semantics ...
Dissertation
Fine-scale grassland monitoring using unmanned aerial vehicle borne remote sensing
(2020-04)
RS is widely employed as a non-destructive methodology to monitor grasslands. Usage of UAV as the RS platform benefits to provide high spatial (fine-grain) and temporal resolution, unclouded data over small grassland extent. Therefore, this thesis evaluated the applications of UAV-borne RS for fine-scale grassland monitoring along with practical farm condition. Grass biomass estimation, predicting forage quality of grass and mapping invasive lupine in grasslands are considered as applications of UAVborne RS.
Dissertation
Modellbildung in der algebraischen Kryptoanalyse
(2015-04-22)
In der algebraischen Kryptoanalyse werden moderne Kryptosysteme als polynomielle, nichtlineare Gleichungssysteme dargestellt. Das Lösen solcher Gleichungssysteme ist NP-hart. Es gibt also keinen Algorithmus, der in polynomieller Zeit ein beliebiges nichtlineares Gleichungssystem löst. Dennoch kann man aus modernen Kryptosystemen Gleichungssysteme mit viel Struktur generieren. So sind diese Gleichungssysteme bei geeigneter Modellierung quadratisch und dünn besetzt, damit nicht beliebig. Dafür gibt es spezielle ...
Dissertation
Development, Verification and Analysis of a Fault Injection Tool for Improving Dependability of FPGA Systems
(2019-11)
Field Programmable Gate Array (FPGA) has been involved in various applications in the last couple of decades, such as aerospace, biomedical instrumentation, safety-critical systems, and spacecraft, due to their remarkable features. These features include parallelism, reconfiguration, self-healing capabilities, availability, low cost and low design turn-around time. FPGA devices are sensitive to Single Event Effects (SEE), which can be caused by various sources, such as α-particles, cosmic rays, atmospheric neutrons, ...