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398 documents, page 1 of 40

Automated Security Analysis of Virtualized Infrastructures

Bleikertz, Sören (2017)
Virtualization enables the increasing efficiency and elasticity of modern IT infrastructures, including Infrastructure as a Service. However, the operational complexity of virtualized infrastructures is high, due to their dynamics, multi-tenancy, and size. Misconfigurations and insider attacks carry significant operational and security risks, such as breaches in tenant isolation, which put both the infrastructure provider and tenants at risk. In this thesis we study the questi...

Laser Spectroscopic Investigation of Exotic States in Noble Gases

Martin, Alexander (2017)
The focus of this thesis lies on exotic states of noble gases, in particular metastable neon (Ne*) and boron-like argon ions (Ar13+): the former shows extraordinary collisional properties due to its high internal energy compared to its low kinetic energy. On the other hand, highly charged ions, such as Ar13+, can be used to verify quantum electrodynamics with extremely high accuracy by determining their magnetic moments. These extraordinary atomic states can be probed with methods of la...

Digitally assisted analog electronics: trade-offs and applications on mixed signal and RF front-ends

Xiong, Botao (2017)
The development of integrated circuits has been governed by Moore's law for several decades. Through continuous advancements in CMOS technology, the industry has maintained exponential progress rates in transistor miniaturization and integration density. However, this technology scaling trend is only conditionally beneficial for analog circuit performance. Compared with the analog circuits, digital circuits are cheaper, faster, more complex, and more power efficient. Due to these reasons, ...

Resection-dependent canonical non-homologous end-joining induces genomic rearrangements

Anugwom (geb. Biehs), Ronja (2017)
DNA double-strand breaks (DSBs) are the main threat to genomic integrity. The majority of DSBs are repaired by canonical non-homologous end-joining (c-NHEJ), where the two DSB ends are rejoined with minimal processing. Some studies suggest that the rejoining of DSBs by c-NHEJ can be error-prone by causing sequence alterations and/or the misrejoining of two separate DSBs. Such genomic rearrangements are a driving force in carcinogenesis. However, it remains an ongoing discussion as to how such...

Half-quadratic Inference and Learning for Natural Images

Schmidt, Uwe (2017)
Many problems in computer vision are ill-posed in the sense that there is no unique solution without imposing additional regularization or prior knowledge about the desired result. In this dissertation, we are particularly interested in the restoration of natural images, which aims at recovering a clean image from a corrupted observation, such as an image afflicted by noise or blur. In a generative approach, it is common to separate modeling of the image prior (regularization term) and th...

Entwicklung und Anwendung eines fahrerorientierten Versuchskonzepts zur subjektiven Bewertung des Lenkgefühls am schweren Nutzfahrzeug

Lindner, Alisa Stephanie Tanja (2017)
Die Lenkung ist ein elementarer Teil der Mensch-Maschine-Schnittstelle im Fahrzeug. Sie ist nicht nur essentiell für die Querführung des Fahrzeugs, sondern auch ein wichtiges Rückmeldeinstrument bezüglich des Fahr-zustands. Die Summe der Wahrnehmungen eines Fahrers beim Lenken eines Fahrzeugs wird als Lenkgefühl bezeichnet. Bisher waren die Freiheiten bei der Lenkungsauslegung am schweren Nutzfahrzeug aufgrund der technischen Gegebenheiten stark eingeschränkt. Zukünftig werden jedoch hybride ...

Terrestrisches Laserscanning zur Quantifizierung von Trennflächenparametern für statistisch signifikante Discrete-Fracture-Network-Modelle

Laux, Dennis (2017)
Die Erfassung und Charakterisierung von Trennflächen in geologischen Aufschlüssen ist eine wichtige Aufgabe von Geowissenschaftlern. Da die klassische, händische Messung von Trennflächenparametern zeitintensiv ist, löst das terrestrische Laserscanning diese Methode ab. Das terrestrische Laserscanning erlaubt die Erfassung von Oberflächenstrukturen und deren Darstellung als dreidimensionale Punktwolken. Innerhalb dieser Punktwolken ist die Quantifizierung geomet...

Faster Oblivious Transfer Extension and Its Impact on Secure Computation

Zohner, Michael (2017)
Secure two-party computation allows two parties to evaluate a function on their private inputs while keeping all information private except what can be inferred from the outputs. A major building block and the foundation for many efficient secure computation protocols is oblivious transfer (OT). In an OT protocol a sender inputs two messages (x_{0}, x_{1}) while a receiver with choice bit c wants to receive message x_{c}.The OT protocol execution guarantees that the sender learns no informati...

Cubic Silicon Carbide For Direct Photoelectrochemical Water Splitting

Tengeler, Sven (2017)
The goal of this work was to investigate cubic silicon carbide as anode material for direct photoelectrochemical water splitting. From the performed measurements (mostly photoelectron spectroscopy, electrochemical measurements, Raman and UV-Vis spectroscopy) n-type cubic silicon carbide’s low oxygen evolution efficiency could be related to some fundamental problems. Primarily, the attainable photocurrent is limited by the flux of photo generated holes to the semiconductor surface. As cubic...