3. 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.
4. 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
5.
6. 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 user’s
task.
Time , location, user social status.
Context is always dynamic hard to predict.
7. 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.
8. 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.
14. 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.
15. Identifying the context.
External Sensors and internal sensors.
User social activities.
User past data.
18. Methodology
Extract the user context .
Process the user context.
Logic based.
Object model.
Use the processed context to make decisions.
19.
[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: matthias.baldauf@vresearch.atSchahramDustdar* 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
Lonsdale21r.beale@cs.bham.ac.ukSchool of Computer Science2p.lonsdale@bham.ac.ukSchool 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 jkcho@mmlab.snu.ac
[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 albrecht@teco.edu
