Advanced Lectures on Networking Networking 2002 Tutorials - download pdf or read online

By Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

This ebook provides the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in may well 2002.The academics current a coherent view of the center matters within the following areas:- peer-to-peer computing and communications- cellular computing middleware- community protection within the multicast framework- categorizing computing resources in line with conversation styles- feedback on ad-hoc networking- verbal exchange via digital applied sciences- optical networks.

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In a fixed distributed environment, context is more or less static: bandwidth is high and continuous, location almost never changes, hosts can be added, deleted or moved, but the frequency at which this happens is by orders of magnitude lower than in mobile settings. Services may change as well, but the discovery of available services is easily performed by forcing service providers to register with a well-known location service. Context is extremely dynamic in mobile systems. Hosts may come and leave generally much more rapidly.

Because exhaustive coverage of all existing and potential approaches is impossible, we attempt to identify key characteristics of existing approaches that cluster them into more or less natural categories. This allows classes of middleware systems, not just instances, to be compared. Section 2 describes the main characteristics of mobile systems and highlights the many extents to which they differ from fixed distributed systems. Section 3 presents a reference model; Section 4 describes the main characteristics of middleware for distributed systems and their limitations in terms of mobility requirements.

Location-aware Middleware. Location is one of the most studied aspects of context awareness. Location awareness has attracted a great deal of attention and many examples exist of applications that exploit location information to: offer travellers directional guidance, such as the Shopping Assistant [6] and CyberGuide [37]; to find out neighbouring devices and the services they provide, such as Teleporting [8]; to send advertisements depending on user’s location, such as People and Object Pager [12]; to send messages to anyone in a specific area, such as Conference Assistant [19]; and so on.

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