Altran

About: Altran is a company organization based out in Neuilly-sur-Seine, France. It is known for research contribution in the topics: Software development & Formal verification. The organization has 488 authors who have published 512 publications receiving 6395 citations.

Algorithms and Tools for Intelligent Monitoring of Critical Infrastructure Systems

Abstract: Critical Infrastructure Systems (CIS) are essential services to sustain both society and economy. In fact, CIS can be considered as vital systems for a geographic area or a country. Such valuable assets have to be carefully monitored because their partial or complete failure (caused by natural hazards or criminal acts) could produce severe costs in terms of environment, economy and, in the worst scenario, human lives. The need to protect and maintain CIS and the surrounding environment is pushing the research for the development of intelligent monitoring systems, able to detect anomalies and events and to adapt autonomously to the changes in the system under investigation. In this chapter, we describe an intelligent hardware-software architecture for CIS monitoring, specifically designed for asynchronous events detection, remote configurability and diagnosis. In particular, this monitoring system is based on a novel hybrid architecture, in which different sensors, architectures and physical phenomena under monitoring coexist and cooperate to provide different views of the same physical phenomenon. In fact, the proposed monitoring system is able to gather both high frequency signals (microscopic level), such as accelerometer signals, and low-dynamic signals (macroscopic level), such as temperature and inclination. The monitoring system is connected to a remote data center, which collects, interprets and forwards them to the stakeholders in the desired format. The design principles driving the monitoring system are introduced. As a practical application will be shown a CIS monitoring system employed to monitor the Rialba’s tower, a rock tower-like limestone complex overlooking an area of strategic importance connecting the Lecco and Como provinces in north Italy. The rock tower is indeed exposed to a rock toppling risk, thus menacing an area characterized by the presence of a freeway, a railway line and gas and power distribution pipelines.

CFD Prediction of Retractable Landing Gear Aerodynamics

Abstract: CFD analysis is carried out to evaluate the mean aerodynamic loads on the retractable main landing-gear of a regional transport commercial aircraft. The mean flow around the landing-gear system including doors is simulated by using the Reynolds-averaged Navier-Stokes modelling approach, the governing equations being solved with a finite volume-based numerical technique. The computational grid is automatically adapted to the time-changing geometry by means of a dynamic meshing technique, while following the deployment of the landing-gear system. The present computational modelling approach is verified to have good practical potential by making a comparison with reference experimental data provided by the Leonardo Aircraft Company aerodynamicists.

Schätzen in Binomialmodellen

Abstract: In diesem Kapitel stehen Zufallsexperimente mit binarem Ausgang im Zentrum, d.h. die Zufallsvariable kann nur zwei mogliche Auspragungen annehmen. Probleme dieser Art finden beispielsweise in Industriebetrieben Anwendung, wie folgendes Beispiel zeigen soll.

Architectures of Charge Pump for Digital Phase Locked Loops

Abstract: Varieties of charge pump architectures are discussed and simulated with constant loop parameters. DC mismatch is significantly compared for single-ended and fully differential charge pumps. The charge pumps are designed with foundry tsmc, 90 nm and 1.8 V CMOS technology. The improved versions of single-ended and differential charge pumps are explicating providing high performance. The current mismatch is achieved less than 0.01–0.2% for different architectures.

Zuckerbrot oder Peitsche? Drosophila Larven und Bootstrap

Abstract: Eine der schonsten Seiten an der Arbeit eines Statistikers ist es, dass man mit sehr vielen unterschiedlichen Fachrichtungen und Themen in Beruhrung kommt. Speziell Biologen und Mediziner sind Gruppen, die man haufig in ihrer Arbeit unterstutzen kann.