Overlay-Netzwerke haben sich während der vergangenen Jahre zu einem neuen Paradigma im Bereich verteilter Systeme entwickelt. Sie erlauben es durch das Überlagern eines logischen Netzwerkes auf ein physikalisches Netzwerk, die Suche von verteilten Ressourcen unter Verwendung anwendungsspezifischer Schlüssel und Suchkriterien zu unterstützen. Dabei wird auf eine zentrale Koordination weitgehend ...

Video texts are closely related to the content of a video. They provide a valuable source for indexing and interpretation of video data. Text detection and recognition task in images or videos typically distinguished between overlay and scene text. Overlay text is artificially superimposed on the image at the time of editing and scene text is text captured by the recording system. Typically, OC...

We present a middleware to store multidimensional data sets on Internet-scale distributed systems and to efficiently perform range queries on them. Our structured overlay network SONAR (Structured Overlay Network with Arbitrary Range queries) puts keys which are adjacent in the key space on logically adjacent nodes in the overlay and is thereby able to process multidimensional range queries wit...

A fundamental problem for the development of P2P Distributed Virtual Environments is the definition of an overlay supporting interest management, i.e. determining all the entities of the virtual world that are relevant for a given peer. To this end, we propose a gossip-based approach that considers the coverage of the Area Of Interest of a peer as the guiding principle for the definition of the...

While peer-to-peer networks are mainly used to locate unique resources across the Internet, new interesting deployment scenarios are emerging. Particularly, some applications (e.g., VoIP) are proposing the creation of overlays for the localization of services based on equivalent servants (e.g., voice relays). This paper explores the possible overlay architectures that can be adopted to provide ...

We propose a novel service architecture to provide DoS resistant communication services in the Internet. The architecture consists of a large scale federated overlay network with DoS protected tunnels established between overlay nodes. Individual overlay nodes are deployed and maintained by the domains hosting them. The overlay network as a whole is shared by all participating domains. This arc...

Recent years have witnessed a remarkable spread of interest in decentralised infrastructures for Internet services. Peer-to-Peer systems and overlay networks have given rise to a major paradigm shift and to novel challenges in distributed systems research. Numerous projects from several research communities and commercial organisations have started building and deploying their own systems. Adop...