Information Technology Reference
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10.4.4. Semantic units
The information emitted by information sources is said to be composed of
semantic units (abbreviated as s.u.). A semantic unit corresponds to elementary
information that can be transmitted over a network and can be expressed in at least
one modality. For example, a semantic unit can carry information corresponding to
the boarding gate of a passenger in an airport or to the time of the next train going in
the desired direction.
Semantic units are meant to be expressed on a presentation device and according
to a given modality. It is therefore necessary to associate practical content in the
modality in question. However, the automatic generation of content is a research
project in its own right [ZOC 02]: we will not explain these processes in detail. For
us, the generation of practical content is seen as a black box , the input of which is
specified (practical modality), and of which we use the output (practical content).
Figure 10.5 summarizes the process of practical content generation for a given
semantic unit, according to different modalities.
Figure 10.5. Generation of practical content: the same semantic unit (s.u.) generates
different practical content for each instantiated modality
10.5. Agent architecture
In our view of ambient intelligence, we have three types of entities (K, U and P)
but there can be many instances of them. Furthermore, we do not set any mobility
constraint. We presume that the three types of entities can be mobile. We wish to
give the personnel in the places where the system is deployed the possibility of
reorganizing the layout of the information sources, to move presentation devices, to
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