DaimlerChrysler Aerospace

About: DaimlerChrysler Aerospace is a based out in . It is known for research contribution in the topics: Fuselage & Magnetic resonance imaging. The organization has 825 authors who have published 635 publications receiving 9469 citations.

Design of 5.9 ghz dsrc-based vehicular safety communication

Abstract: The automotive industry is moving aggressively in the direction of advanced active safety. Dedicated short-range communication (DSRC) is a key enabling technology for the next generation of communication-based safety applications. One aspect of vehicular safety communication is the routine broadcast of messages among all equipped vehicles. Therefore, channel congestion control and broadcast performance improvement are of particular concern and need to be addressed in the overall protocol design. Furthermore, the explicit multichannel nature of DSRC necessitates a concurrent multichannel operational scheme for safety and non-safety applications. This article provides an overview of DSRC based vehicular safety communications and proposes a coherent set of protocols to address these requirements

Evolution and epidemic spread of SARS-CoV-2 in Brazil.

Abstract: Brazil currently has one of the fastest-growing severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) epidemics in the world. Because of limited available data, assessments of the impact of nonpharmaceutical interventions (NPIs) on this virus spread remain challenging. Using a mobility-driven transmission model, we show that NPIs reduced the reproduction number from >3 to 1 to 1.6 in Sao Paulo and Rio de Janeiro. Sequencing of 427 new genomes and analysis of a geographically representative genomic dataset identified >100 international virus introductions in Brazil. We estimate that most (76%) of the Brazilian strains fell in three clades that were introduced from Europe between 22 February and 11 March 2020. During the early epidemic phase, we found that SARS-CoV-2 spread mostly locally and within state borders. After this period, despite sharp decreases in air travel, we estimated multiple exportations from large urban centers that coincided with a 25% increase in average traveled distances in national flights. This study sheds new light on the epidemic transmission and evolutionary trajectories of SARS-CoV-2 lineages in Brazil and provides evidence that current interventions remain insufficient to keep virus transmission under control in this country.

Dimensions of national culture and corporate adoption of IT infrastructure

Abstract: Corporate adoption of information technology (IT) infrastructure is a critical management issue that may be affected by national culture. Prior research has shown that dimensions of national culture affect development of national IT infrastructure as well as adoption and impact of IT applications. This study explores the impact of two dimensions of national culture (uncertainty avoidance and power distance) on the adoption of a type of IT infrastructure (frame relay). A multinational survey was carried out, and it yielded useable responses from 153 businesses from 24 countries. The results demonstrated that businesses from higher uncertainty avoidance countries were less likely to adopt frame relay. A one-point increase in Hofstede's uncertainty avoidance index for the country of incorporation was associated with a 3% lower likelihood of adopting frame relay. Power distance was not significantly correlated with adoption of frame relay. These results highlight the relevance of dimensions of national culture as factors affecting corporate adoption of IT infrastructure. Implications for practice and further research are presented.