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Dissertation
Entwicklung eines Nanoimprint-Prozesses zur Herstellung von dreidimensional strukturierten Nanopartikeln mit erhöhter mechanischer Stabilität
(2019)
The nanoimprint technology realizes already the production of two-dimensional (2D) shaped nanoparticles of different shapes and materials. These nanoparticles can be applied in advanced applications in material engineering, as well as in biology and particularly in drug-delivery systems. This work presents three-dimensional (3D) shaped nanoparticles with T-, L- and step-like cross-sections, implemented by substrate conformal imprint lithography (SCIL) and a manual soft-imprint technique. Further, 2D shaped nanoparticles ...
Dissertation
Social Network Mining for Analysis of Social Phenomena
(2019)
In den letzten zehn Jahren wurde eine große Menge an Daten über menschliche Interaktionen verfügbar, die entweder aus sozialen Online-Netzwerken stammen oder von tragbaren Geräten erfasst wurden. Die klassischen Sozialwissenschaften bieten keine Instrumente für die Durchführung datengetriebener Forschung mit solchen Daten. Die computerorientierte Sozialwissenschaft (Computational Social Science) versucht, diese Lücke zu schließen, indem sie Methoden für Data-Mining und maschinelles Lernen zur Nutzung der Daten aus ...
Konferenzveröffentlichung
Weight reduction of DC/DC converters using controllable inductors
(VDE Verlag, 2019-07)
Controllable inductors can be realized by introducing auxiliary windings into the device that partially saturate the core and allow variation of the inductance value. This can be used to achieve zero-voltage switching in a DC/DC converter over a wide load range while at the same time the weight of the inductor is reduced. In this paper the possible size and weight reduction and the influence on the efficiency is calculated and compared to other solutions. The results are verified in a prototype.
Dissertation
Ein Sensornetz zur Vermessung des Magnetfeldes am KATRIN Hauptspektrometer
(2019)
Das KARlsruhe TRItium Neutrino Experiment gilt als die genaueste Waage der Welt und hat sich der Aufgabe verschrieben die Masse des elektronischen Anti-Neutrinos mit einer Unsicherheit von m = 0:2 eV/c2 zu messen. Das Funktionsprinzip des eingesetzten Spektrometers erfordert eine genaue Kenntnis des Magnetfeldverlaufes im Inneren des Spektrometers. Aufgrund der Forderung nach einem extrem guten Vakuum ist eine direkte Messung des Magnetfeldes jedoch unmöglich. Die vorliegende Arbeit zeigt eine effektive Lösung auf ...
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, ...
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
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
Implizite Positionierung unter Nutzung des Smartphone-Kompasses
(2019)
Der Ort, an dem ein Nutzer sich in einem Gebäude aufhält, spielt für technische Dienste wie Heimautomatisierung eine zentrale Rolle. In dieser Dissertation wird die Implizite Positionierung vorgestellt, ein neues Verfahren, das den Aufenthaltsort eines Nutzers mittels des Kompasses eines Smartphones erkennt, das der Nutzer bei sich trägt. Das Verfahren findet in den Kompassdaten Muster, die entstehen, wenn Nutzer durch Flure, Treppen, etc. oder um Ecken gehen. Da die Ausrichtungen dieser Orte die Nutzer in ihrer ...
Dissertation
Understanding Factors Influencing the Performance of a Wi-Fi Fingerprinting System
(2019)
Location information plays a vital role in today’s society. People usually carry their mobile devices everywhere they go to benefit from real-time location services; the location of the device is the location of users. The focus of positioning services is shifting from outdoors to indoors. Technological services which depend on indoor locations are increasing in popularity. Wi-Fi fingerprinting is a promising technique that can be used for indoor localization. In this regard, this dissertation targets at improving ...
Dissertation
MOCCAA - MObile Cloud Computing AdaptAble
(2019-08)
The primary objective of Mobile Cloud Computing (MCC) is the support of resource-constrained mobile devices by means of Cloud or nearby computing resources. In general, this is achieved by outsourcing or offloading computational intensive tasks of mobile applications. This allows, for instance, to virtually extend the processing power of mobile devices and, indirectly, to save battery life. In case remote resources are not available or the communication link is broken, still a local execution is possible.
The ...