Introduction Identifying user location, find people around the
user, the time of the day, season, orientation, speed, emotions
these all can be included to define a context. Apply the relevant
context detail and try to find the best match, determine what is
the user is doing at at that time.
Computing context network connectivity communication cost,
communication bandwidth nearby resource User context user profile,
location, social situation Physical context lighting, noise,
traffic condition, temperature Time context Time of a day, week,
month and season of the year
Context aware computing A system is context-aware if it uses
context to provide relevant information and/or services to the
user, where relevancy depends on the users task. Time , location,
user social status. Context is always dynamic hard to predict.
Important of the context context based application gather
information from a certain user and adopts the application
according to the user behaviors . Introduction of PDA and smart
phones. providing highly enhance user based application to the user
is totally depend on the user context.
Important of the context For instance if user is in a meeting
or in a class room application identify the user context and make
the phone to silent mode or replying the phone calls with the
automated text message without the users interaction.
Context based applications A simple call forwarding
system.
Context based applications A simple call forwarding system.
Uses location context Activity context
Context based applications Shopping assistant system.
Context based applications Shopping assistant system. Location
context Identity context.
Location based tourist guide application. App download
applications.
Identifying the context. Sensing Location Global Positioning
System (GPS) GPS-less Low Cost Outdoor Localization For Very Small
Devices. Mobile-IP protocol. Mobile cells, wireless devices .
Issues. no uniform way to track locations with fine granularity
that works both indoors and outdoors.
Identifying the context. External Sensors and internal sensors.
User social activities. User past data.
Context Processing
Methodology Extract the user context . Process the user
context. Logic based. Object model. Use the processed context to
make decisions.
[1] Towards a Better Understanding of Context
andContext-AwarenessAnind K. Dey and Gregory D. AbowdGraphics,
Visualization and Usability Center and College of Computing,Georgia
Institute of Technology, Atlanta, GA, USA 30332-0280 [2] Matthias
BaldaufV-Research, Industrial Research and Development,Stadtstrasse
33, 6850 Dornbirn, AustriaE-mail:
[email protected]* and Florian
RosenbergDistributed Systems Group, Information Systems
Institute,Vienna University of Technology, Argentinierstrasse
8/184-1, 1040 Vienna, Austria [3]EijaKaasinenUser needs for
location-aware mobile servicesReceived: 1 August 2002 / Accepted:
15 November 2002_ Springer-Verlag London Limited 2003 [4] Mobile
Context Aware Systems: the intelligence tosupport tasks and
effectively utiliseresourcesRussell Beale1 and Peter
[email protected] of Computer
[email protected] of EngineeringUniversity of
BirminghamBirmingham B15 2TT UK [5]Context-aware computing
applications B Schilit, N Adams, R Want Mobile Computing Systems
and Applications, 1994. [6] A Survey of Context-Aware Mobile
Computing Research Guanling Chen and David Kotz 2005.11. 14 Cho
Jaekyu [email protected] [7]Y. Kawahara, H. Kurasawa, H. Morikawa,
Recognizing user context using mobile handsets with acceleration
sensors, in: (IEEE) Intl. Conf. on Portable Information Devices,
PORTABLE'07, 2007, pp. 15 [8] E. Welbourne, J. Lester, A. LaMarca,
G. Borriello, Mobile context inference using low-cost sensors, in:
Location- and Context-Awareness, in: LectureNotes on Computer
Science (LNCS), vol. 3479, Springer-Verlag, 2007, pp. 254263
[9][There is more to Context than LocationAlbrecht Schmidt, Michael
Beigl, and Hans-W. Gellersen Telecooperation Office (TecO),
University of Karlsruhe,Vincenz-Priessnitz-Str. 1, 76131 Karlsruhe,
Germany [email protected]
Taxonomyofarchitectures,contextawareness,technologies and
applications Christos Emmanouilidis n,
RemousArisKoutsiamanis,AimiliaTasidouHead,ComputationalSystems&Applications,Athena,Research&InnovationCentreTsimiski5
8,67100Xanthi,Greece