A Framework for Certified Self-Stabilization

We propose a general framework to build certified proofs of distributed self-stabilizing algorithms with the proof assistant Coq. We first define in Coq the locally shared memory model with composite atomicity, the most commonly used model in the self-stabilizing area. We then validate our framework by certifying a non trivial part of an existing silent self-stabilizing algorithm which builds a $k$-hop dominating set of the network. We also certified a quantitative property related to the output of this algorithm. Precisely, we show that the computed $k$-hop dominating set contains at most $\lfloor \frac{n-1}{k+1} \rfloor + 1$ nodes, where $n$ is the number of nodes in the network. To obtain these results, we also developed a library which contains general tools related to potential functions and cardinality of sets

Size-dependent stability of ultra-small α-/β-phase tin nanocrystals synthesized by microplasma

Key features of tin, including electronic band structure and opto-electronic properties, are influenced by the crystal structure. Here the authors report a microplasma process for the synthesis of ultra-small tin nanocrystals in which the crystal structure is dependent on crystallite size

Monitoring der Qualität von EKG-Registerungen in bevölkerungsbasierten Untersuchungen.

Für die Validität und die Präzision diagnostisch relevanter elektrokardiographischer (EKG-) lvferkmale spielt die Qualität der EKG-Registrierung eine bedeutende Rolle. Dies gilt trolz der Verfügbarkeit leistung.)jähiger Verfahren der Computer-EKG-Analyse mit vielen Möglichkeiten der Signal bereinigung. Im Rahmen des Qualitätssicherungsprogramms des 4. KORA Gesundheits-Surveys (KORA-S4) wurde ein kontinuierliches Monitoring der EKG-Signalqualität durchgeführt. Ziel war die Verfügbarkeit störllngsarmer EKG-Sequenzen für die exakte und unverzerrte Schätzung bevölkerungsbezogener EKG-Parameter. Im KORA-S4 wurden 4261 Personen aus der Allgemeinbevölkerllng der Region Augsburg im Rahmen eines umfangreichen standardisierten Prögramms untersucht

A Method for Assessing Significant Changes in Serial ECG Comparison

Abstrac

Factors affecting the sensitivity of computerized ECG analysis in identifying previous myocardial infarction.

We investigated to what extent the ECG sensitivity in identifying previous myocardial infarctions (MI) is affected by the clinical/epidemiological criteria having been used in the acute MI stage. The sensitivity was determined analyzing the 12 lead resting ECGs during a follow-up of 432 long-term survivors who suffered three to 13 years ago from MI. The ECG analysis in the follow-up was performed using the Hannover ECG program. The sensitivity values determined ranged from 61.3% up to 88.4% depending on the criteria used for case selection