Fabian Hartmann

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—Mobile devices like laptops or smartphones are getting more and more powerful, but still these devices are mainly used to access services, which are provided by centralized servers in the Internet. We argue that the full potential of such mobile devices could be unfold if these devices would provide services like instant messaging or file transfer(More)
—Structured peer-to-peer systems—also known as key-based routing protocols—offer a base for a broad range of applications. In the past, different topology adaptation mechanisms for minimizing key-based routing latencies were proposed and deployed with several today's state-of-the-art protocols. In this paper we introduce coordinate-based routing (CBR), a(More)
We present <i>SnapApp</i>, a novel unlock concept for mobile devices that reduces authentication overhead with a time-constrained quick-access option. <i>SnapApp</i> provides two unlock methods at once: While PIN entry enables full access to the device, users can also bypass authentication with a short sliding gesture (<i>"Snap"</i>). This grants access for(More)
The recent success of online social networks hints at the general interest in socio-aware, user-centric networking applications. At the same time, mobile consumer devices are becoming both more powerful and more widespread. As an implication of these trends, user-centric networking can be realized directly between the users' devices, i.e. without depending(More)
ChIP-seq experiments detect the chromatin occupancy of known transcription factors in a genome-wide fashion. The comparisons of several species-specific ChIP-seq libraries done for different transcription factors have revealed a complex combinatorial and context-specific co-localization behavior for the identified binding regions. In this study we have(More)
Dysregulation of emotional arousal is observed in many psychiatric diseases such as schizophrenia, mood and anxiety disorders. The neurotrophic tyrosine kinase receptor type 2 gene (NTRK2) has been associated with these disorders. Here we investigated the relation between genetic variability of NTRK2 and emotional arousal in healthy young subjects in two(More)
The original Pascaline was a mechanical calculator able to sum and subtract integers. It encodes information in the angles of mechanical wheels and through a set of gears, and aided by gravity, could perform the calculations. Here, we show that such a concept can be realized in electronics using memory elements such as memristive systems. By using(More)
Communication between users poses a privacy problem as soon as it relies on a third party. The problem ranges from personalized advertising to mass surveillance and applies primarily to centralized application service providers. However, also nodes in decentralized approaches are often under control by a third party. We argue that application data and(More)