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For example, in a museum such a system can provide the visitor (with
PDA or similar device) information related to the particular point of the
building where it is located, the system recognizes the user's position using
different solutions: a bar code, wireless and IR sensors. If in a museum we
are in front of an artwork, we can obtain additional information about it
and its author. But the tourist guide is not the only possible application.
In a hospital, like a museum, the physician as the visitor may have specific
information useful associated to the position-location in which they are. An
example of application is the 'bus catcher' [16,17], which aims to provide
detailed information on public services, such as the location of the means,
routes and times of arrival.
This chapter was written with the contribution of the following students
who attended the lessons of 'Grids and Pervasive Systems' at the faculty of
Engineering in the University of Palermo, Italy: Barrale, Cannizzo, Muratore,
Scoma, Trapani and Vaste.
Authors would also like to thank Giovanni Pilato for his help in the
Italian-English translation.
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