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Dissertation
Effects of climate change on fungal community structure and organic matter turnover in soil profiles along elevation gradients in alpine ecosystems
(2019-10)
Although elevation patterns of diversity for plants and animals are well known, understanding of variations in fungal community structure along elevation gradients is limited. Soil fungi play an important role in soil microbial communities, where they improve soil organic matter (SOM) turnover and nutrient circulation. Hence, any change in fungal community structure will have strong effects on soil and ecosystem functioning. The main purpose of this thesis is therefore to investigate how climate induced shifts in ...
Dissertation
Steuerung im deutschen Gesundheitswesen?
(2019-06)
Die Dissertation widmet sich der Prüfung des – die deutsche gesundheitspolitische Diskussion dominierenden und maßgeblich von der orthodoxen Gesundheitsökonomie geprägten – Paradigmas der Steuerung ärztlichen Verhaltens mittels monetärer Anreize. Als „Prüfrahmen“ dienen die strukturierten Behandlungsprogramme (DMP) nach § 137f SGB V und die integrierte Versorgung (IV) nach §§ 140a ff. SGB V, die als deutsche Managed Care-Derivate maßgeblich von diesem Paradigma geleitet sind und, wie die Arbeit zeigt, in der ...
Dissertation
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
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
High-Speed 1.55 µm Quantum Dot Lasers with Electronically Coupled Quantum Well - Dot Active Regions
(2019-07-31)
The expansion of long-distance data communication at a wavelength of 1.55 µm calls for larger data transfer rates. Consequently, an improvement of emission and modulation properties of lasers emitting in this wavelength region is of high interest. The utilization of so-called tunnel-injection (TI) structures in InP-based quantum dot (QD) lasers is promising to fulfill this task. The aim of this thesis was the realization and analysis of TI structures in the lattice matched InP material system and incorporation into ...
Dissertation
Multi-Frequency Microwave Radiometer for Medical Thermography
(2019-09)
Microwave radiometer systems are an entirely non-invasive, non-toxic, avoiding ionizing radiation, and relatively inexpensive detecting modality. The microwave radiometry technique is based on the measurement of natural electromagnetic noise signals emitted by lossy materials. In medicine, microwave radiometry technique offers a non-invasive thermometry method having the potential advantages of monitoring and producing a full map of the temperature deeply inside the human tissues. The method of diagnosing procedures ...
Dissertation
1.55 μm Quantum Dot Lasers for Telecommunication
(2019)
The thesis at hand investigates the suitability of quantum dot (QD) material for use in long-distance coherent communication. The thesis was written in the frame of the SASER project MONOLOP that is aiming for a compact, monolithically integrated light source with a tunable wavelength covering the C+-band and narrow spectral linewidth below 500 kHz.
The thesis reviews the theoretical background of quantum dot material based on the InP material system and distributed feedback (DFB) lasers with lateral gratings as ...
Dissertation
Wahrnehmungen und Deutungen von Jugendstrafgefangenen und Fachkräften zum Jugendstrafvollzug
(2019-08)
Die Jugendstrafe stellt die ultima ratio jugendstrafrechtlicher Sanktionen dar und soll nur dann zur Anwendung kommen, wenn die im Jugendgerichtsgesetz vorgesehenen Erziehungsmaßregeln oder Zuchtmittel nicht mehr geeignet erscheinen, die Wiederholung von Straftaten zu verhindern. Sie wird ausdrücklich mit erzieherischen Intentionen verhängt und soll damit die Adressaten dazu »… befähigen, künftig in sozialer Verantwortung ein Leben ohne Straftaten zu führen« (vgl. § 2 SächsJStVollzG). Am 31.05.2006 entschied das ...
Dissertation
Power System Inertia
(2019)
System inertia is the instantaneous power reserve that stabilizes power systems after large-scale disturbances. It declines with increasing renewable generation, causing an increased risk of black-out unless action is taken. Providing additional inertia will be necessary to maintain security of supply at a reasonable level. To solve the problem of reduced inertia in a reliable and cost-efficient way, this thesis first systematically describes requirements on system level, as basis for the following evaluation of ...