Die Erstellung von Software zur Verwaltung von Overlay-Netzwerken ist aufwändig. Dies steht im Widerspruch zu der hohen Ähnlichkeit zwischen bestehenden Systemen. Sie alle müssen Nachrichten verabeiten und die jeweilige Topologie verwalten. Es stellt sich daher die Frage nach Middleware-Unterstützung, um durch vereinfachte Modelle die Entwicklungsarbeit zu erleichtern. Der vorgestellte Ansatz, ...

In this article, we are concerned with the role of colors in reading written texts. It has been argued that colored overlays applied above written texts positively influence both reading fluency and reading speed. These effects would be particularly evident for those individuals affected by the so called Meares-Irlen syndrome, i.e., who experience eyestrain and/or visual distortions - e.g., col...

Structured overlay networks form amajor class of peer-to-peer systems, which are used to build scalable, fault-tolerant and selfmanagingdistributed applications. This thesis presents algorithms for structured overlay networks, on the routing and data level, in the presence of network and node dynamism. On the routing level, we provide algorithms for maintaining the structure of the overlay, and...

Coloured overlays and coloured lenses can both increase reading speed, but when they do their colour is not necessarily the same, suggesting that the beneficial effects of a coloured filter might depend upon the area of the visual field that it colours. We investigated the effects of overlays on reading speed and varied the size of the overlay and the colour of the surround. Children who had be...

Peer-to-peer (P2P) overlays are appealing, since they can aggregate resources of end systems without relying on sophisticated infrastructures. Services can thus be rapidly deployed over such overlays. Primitive P2P overlays only support searches with single keywords. For queries with multiple keywords, presently only unstructured P2P systems can support by extensively employing message flooding...