![](bg6.png)
ogy that covers typical concepts occurring in context-
aware applications.
Transformation of raw data from basic sensors to
high level information is required to identify con-
text effectively. Context awareness may be imple-
mented either on the device level or on the infras-
tructure level (Loke, 2006). The first requires more
intelligent devices, while the second requires more
advanced context processing on the application level.
A Context Widget (Salber et al., 1999) supplies ab-
stract context information to application hiding the
complexity of the actual sensors. The work (Dimakis
et al., 2008) presents the SitCom and CHILix sys-
tems that enable development of context-aware appli-
cations and incorporation of smart space devices.
6 CONCLUSIONS AND FUTURE
WORK
The designed and implemented solution proved that
the Context-Controller-Action architecture can be
used to develop a dynamic ubiquitous system. Sen-
sor services, context and scenarios, can be configured
at runtime by a non-expert user who is equipped with
a graphical user interface. The internal use of seman-
tic description enables interchange of service infor-
mation and universal definition of contexts. The Web
services interface was used throughout the system to
integrate services with the system, and system mod-
ules between themselves.
Incorporation of semantic information in scenario
definitions is an interesting area of future work. BPEL
for Semantic Web Services is an important initiative
to include semantics into the workflow technology,
but the language has not been implemented in a pro-
cessing engine or design tool yet. Deployment of
further sensors and definition of contexts/scenarios is
another important field of future work. The current
implementation demonstrated the usability of the sys-
tem, but it will be advisable to developmore advanced
behavior scenarios.
ACKNOWLEDGEMENTS
This work was supported in part by the Polish Min-
istry of Science and Higher Education under research
project N N519 172337. Students from the Faculty
of ETI brought significant help in implementation of
basic services.
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