Download Advanced Lectures on Networking: NETWORKING 2002 Tutorials by Jon Crowcroft, Ian Pratt (auth.), Enrico Gregori, Giuseppe PDF

By Jon Crowcroft, Ian Pratt (auth.), Enrico Gregori, Giuseppe Anastasi, Stefano Basagni (eds.)

This publication provides the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in could 2002.
The teachers current a coherent view of the center matters within the following areas:
- peer-to-peer computing and communications
- cellular computing middleware
- community defense within the multicast framework
- categorizing computing resources in response to conversation patterns
- comments on ad-hoc networking
- conversation via digital technologies
- optical networks.

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The idea that has motivated the development of this system is that no migration to an homogeneous communication environment is possible, and therefore an infrastructure that supports a heterogeneous communication environment is necessary. Nexus aims to provide this infrastructure. 4 Nexus Clients/ Applications Distributed Data Management 1 User Interface 3 Communication 2 Outdoor DGPS/GPS Digital Compass Pedometer INS Indoor Imagins Sensors Infrared Signals Radio Networks Active Badge Systems Fig.

We will show some examples of adaptation of object-oriented middleware and message oriented middleware to small and mobile devices. The main problem with the object-oriented approach is that it relies on synchronous communication primitives that do not necessarily suit all the possible mobile system architectures. The computational load of these systems is quite high and the principle of transparency they adhere to does not always fit mobile applications. As we have seen, the requirements for mobile applications are considerably different from the requirements imposed by fixed distributed applications.

This is due to the set of non-functional requirements that the middleware achieves, like fault tolerance, security or resource sharing. Permanent Connection → Synchronous Communication. Fixed distributed systems are often permanently connected to the network through high-bandwidth and stable links. , the component asking for a service and the component delivering that service) are usually connected at the same time. , disconnection due to network overload). Asynchronous communication mechanisms are however also provided by message oriented middleware (MOM) and recently also by the CORBA specification.

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