1,391 research outputs found
GRIDKIT: Pluggable overlay networks for Grid computing
A `second generation' approach to the provision of Grid middleware is now emerging which is built on service-oriented architecture and web services standards and technologies. However, advanced Grid applications have significant demands that are not addressed by present-day web services platforms. As one prime example, current platforms do not support the rich diversity of communication `interaction types' that are demanded by advanced applications (e.g. publish-subscribe, media streaming, peer-to-peer interaction). In the paper we describe the Gridkit middleware which augments the basic service-oriented architecture to address this particular deficiency. We particularly focus on the communications infrastructure support required to support multiple interaction types in a unified, principled and extensible manner-which we present in terms of the novel concept of pluggable overlay networks
A Review of the Energy Efficient and Secure Multicast Routing Protocols for Mobile Ad hoc Networks
This paper presents a thorough survey of recent work addressing energy
efficient multicast routing protocols and secure multicast routing protocols in
Mobile Ad hoc Networks (MANETs). There are so many issues and solutions which
witness the need of energy management and security in ad hoc wireless networks.
The objective of a multicast routing protocol for MANETs is to support the
propagation of data from a sender to all the receivers of a multicast group
while trying to use the available bandwidth efficiently in the presence of
frequent topology changes. Multicasting can improve the efficiency of the
wireless link when sending multiple copies of messages by exploiting the
inherent broadcast property of wireless transmission. Secure multicast routing
plays a significant role in MANETs. However, offering energy efficient and
secure multicast routing is a difficult and challenging task. In recent years,
various multicast routing protocols have been proposed for MANETs. These
protocols have distinguishing features and use different mechanismsComment: 15 page
MARVELO: Wireless Virtual Network Embedding for Overlay Graphs with Loops
When deploying resource-intensive signal processing applications in wireless
sensor or mesh networks, distributing processing blocks over multiple nodes
becomes promising. Such distributed applications need to solve the placement
problem (which block to run on which node), the routing problem (which link
between blocks to map on which path between nodes), and the scheduling problem
(which transmission is active when). We investigate a variant where the
application graph may contain feedback loops and we exploit wireless networks?
inherent multicast advantage. Thus, we propose Multicast-Aware Routing for
Virtual network Embedding with Loops in Overlays (MARVELO) to find efficient
solutions for scheduling and routing under a detailed interference model. We
cast this as a mixed integer quadratically constrained optimisation problem and
provide an efficient heuristic. Simulations show that our approach handles
complex scenarios quickly.Comment: 6 page
An Efficient and Reliable Data Transmission Service using Network Coding Algorithms in Peer-to-Peer Network
Network coding is a progressive enhancement in natural network routing that increases throughput and reliability for unicast, multicast, and even broadcast transmissions. P2P networks are ideal for implementing network coding algorithms for two reasons: I. A P2P network's topology isn't predetermined. As a result, designing a topology that is compatible with the network coding algorithm is much easier. II. Every peer is an end host in this network. As a result, instead of saving and sending the message, complex network coding operations, such as encoding and decoding, are now easier to perform. The objective of this work is to use the best features of network coding algorithms and properly apply them to P2P networks to create an efficient and reliable data transmission service. The goal of the network coding algorithm is to make better use of network resources and thus increase P2P network capacity. An encoding algorithm that enables an intermediate peer to produce output messages by encoding (that is, computing a function of the data it receives. The decoder's role is to obtain enough encoded packets so that the original information can be recovered. This research work has measured an amount of hypothetical and applied consequences in which the network coding procedure or a variation of it is used to improve performance parameters such as throughput and reliability in P2P network data transmission based on network coding. The comparison of data transmission between network routing and network coding algorithms was the main focus of this paper. According to our simulations, the new network coding systems can reach 15% to 20% upper throughput than supplementary P2P network routing systems
7. GI/ITG KuVS FachgesprÀch Drahtlose Sensornetze
In dem vorliegenden Tagungsband sind die BeitrĂ€ge des FachgesprĂ€chs Drahtlose Sensornetze 2008 zusammengefasst. Ziel dieses FachgesprĂ€chs ist es, Wissenschaftlerinnen und Wissenschaftler aus diesem Gebiet die Möglichkeit zu einem informellen Austausch zu geben â wobei immer auch Teilnehmer aus der Industrieforschung willkommen sind, die auch in diesem Jahr wieder teilnehmen.Das FachgesprĂ€ch ist eine betont informelle Veranstaltung der GI/ITG-Fachgruppe âKommunikation und Verteilte Systemeâ (www.kuvs.de). Es ist ausdrĂŒcklich keine weitere Konferenz mit ihrem groĂen Overhead und der Anforderung, fertige und möglichst âwasserdichteâ Ergebnisse zu prĂ€sentieren, sondern es dient auch ganz explizit dazu, mit Neueinsteigern auf der Suche nach ihrem Thema zu diskutieren und herauszufinden, wo die Herausforderungen an die zukĂŒnftige Forschung ĂŒberhaupt liegen.Das FachgesprĂ€ch Drahtlose Sensornetze 2008 findet in Berlin statt, in den RĂ€umen der Freien UniversitĂ€t Berlin, aber in Kooperation mit der ScatterWeb GmbH. Auch dies ein Novum, es zeigt, dass das FachgesprĂ€ch doch deutlich mehr als nur ein nettes Beisammensein unter einem Motto ist.FĂŒr die Organisation des Rahmens und der Abendveranstaltung gebĂŒhrt Dank den beiden Mitgliedern im Organisationskomitee, Kirsten Terfloth und Georg Wittenburg, aber auch Stefanie Bahe, welche die redaktionelle Betreuung des Tagungsbands ĂŒbernommen hat, vielen anderen Mitgliedern der AG Technische Informatik der FU Berlin und natĂŒrlich auch ihrem Leiter, Prof. Jochen Schiller
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