A scalability analysis of grid allocation mechanisms

This article examines the broker's behavior with regard to a varying number of participating nodes and shows that incremental losses have to be accepted in central resource allocation when introducing new nodes. --Grid Computing

Selektion und Übergänge im Bildungssystem. Einleitung in den Thementeil

Im Zuge der wieder erwachten Aufmerksamkeit für den Zusammenhang von Bildung und sozialer Ungleichheit richtet sich ein Schwerpunkt der empirischen Bildungsforschung vor allem auch auf die Übergänge und Statuspassagen im Bildungssystem: Bereits der Verlauf der Elementarbildung, die Einmündung in die Grundschule, insbesondere der Übergang von der Grundschule in die Sekundarstufe, Schulformwechsel und Klassenwiederholungen im Verlauf der gesamten Schulkarriere sowie der Übergang nach der Sekundarstufe I sind dabei die wichtigsten Zäsuren und Markierer. Das deutsche Bildungssystem scheint somit – im internationalen Vergleich besonders deutlich – wie ein Hindernisparcours strukturiert, mit vielen und besonders frühen Schaltstellen der Selektion. (DIPF/Orig.

Evaluation and metrics framework

In this paper a metrics framework for evaluating different scenarios in the CATNETS project is defined. The aim is to use this framework to compare the catallactic scenario against the central auctioneer. --Grid Computing

Simulator Development - Annual Report Year 2

In this paper the simulation environment for the CATNETS project is defined further. The chosen simulator is adopted in terms of new features an architecture changes in order to provide a valid simulation environment for Application Layer Network scenarios. Furthermore the requirements for a scenario generator and the needed configuration mechanisms for the actual simulation runs are introduced. --Grid Computing

Analysis of simulation environment

In this paper the requirements for an ALN simulation environment are analysed, as needed in the CATNETS Project. A number of grid and general purpose simulators are evaluated regarding the identified requirements for simulating economical resource allocation mechanisms in ALNs. Subsequently a suitable simulator is chosen for usage in the CATNETS project. --CATNETS simulator,requirements analysis,simulator selection

Strong Einstein-Podolsky-Rosen entanglement from a single squeezed light source

Einstein-Podolsky-Rosen (EPR) entanglement is a criterion that is more demanding than just certifying entanglement. We theoretically and experimentally analyze the low resource generation of bi-partite continuous variable entanglement, as realized by mixing a squeezed mode with a vacuum mode at a balanced beam splitter, i.e. the generation of so-called vacuum-class entanglement. We find that in order to observe EPR entanglement the total optical loss must be smaller than 33.3 %. However, arbitrary strong EPR entanglement is generally possible with this scheme. We realize continuous wave squeezed light at 1550 nm with up to 9.9 dB of non-classical noise reduction, which is the highest value at a telecom wavelength so far. Using two phase controlled balanced homodyne detectors we observe an EPR co-variance product of 0.502 \pm 0.006 < 1, where 1 is the critical value. We discuss the feasibility of strong Gaussian entanglement and its application for quantum key distribution in a short-distance fiber network.Comment: 4 pages, 4 figure