Stefan Ludwig

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The increasing functional integrity of the organism during fetal maturation is connected with increasing complex internal coordination. We hypothesize that time scales of complexity and dynamics of heart rate patterns reflect the increasing inter-dependencies within the fetal organism during its prenatal development. We investigated multi-scale complexity,(More)
Decreasing feature sizes have led to an increased vulnerability of random logic to soft errors. A particle strike may cause a glitch or single event transient (SET) at the output of a gate, which in turn can propagate to a register and cause a single event upset (SEU) there. Circuit level modeling and analysis of SETs provides an attractive compromise(More)
Existing cryptographic file systems for Unix do not take into account that sensitive data must often be shared with other users, but still kept secret. By design, the only one who has access to the secret data is the person who encrypted it and therefore knows the encryption key or password. This paper presents a kernel driver for a new encrypted file(More)
The verification of a design’s adherence to its specification has been and still is a major problem within the EDA community. Multiple issues like completeness, consistency, and the speed of the verification process are being researched without any feasible solution at hand. This article introduces a technique of normalizing properties and transforming 164(More)
The Great Bustard is on the brink of extinction in Central Europe. Its population is known to suffer high mortality during hard winters, particularly when severe weather conditions cause migration. Long-term winter food management in two populations in Germany did not prevent migration events. To identify migration-triggering factors we tested the potential(More)
Designers trying to build intuitive interaction need to identify screen elements that (potentially) distract users from reaching their goals. The analysis of cursor movements has been proposed as a scalable and low-cost approach to analyze user distraction. Previous research, however, was mainly focused on finding gaze-analogous variables in cursor tracking(More)
We present results of the SIRENA 2011 research cruises conducted by the NATO Undersea Research Centre (NURC) and joined by the Research Department for Underwater Acoustics and Geophysics (FWG), Bundeswehr Technical Centre (WTD 71) and the Universities of Kiel and Pavia. The cruises were carried out in the Ligurian Sea. The main aim of the FWG was to test(More)