1. The Anatomy of a Context-Aware Application
Real Time System Lab.
최 치 호

2. Contents Introduction Indoor Location Sensing Modeling the Environment
Programming with Space
Implementation and performance
Conclusions
Future work

3. Introduction
The essence of mobile computing is that a user’s applications are available wherever that user goes : Follow-me applications
The platform has five main components
A fine-grained location system
A detailed data model
A persistent distributed object system
Resource monitors
A spatial monitoring service

4. Indoor Location Sensing
Location sensor for use in indoor environment
Provide fine-grain spatial information
Unobtrusive, cheap, scalable, robust
Radio-based location techniques : GPS
Electromagnetic methods
Optical systems
Ultrasonic techniques
A Bats : Ultrasonic transducer

6. Modeling the Environment
Context-aware systems should know the user about those aspects of the environment
A detailed model describing entities in the real world and their possible interactions
This model sets out types, names, capabilities and properties of all entities
A bridge : computer system to share the user’s perceptions of the real world

7. Figure 3 : Three-tier architecture
Ouija : using CORBA and an Oracle 7 database
Figure 3 : Three-tier architecture

8. Programming with Space
How Bat readings are interpreted to generate accurate object location information
How application are provided with a suitable abstraction to support location-aware programming

9. Absolute and relative spatial facts
Figure 4 : Representation of a spatial fact
using geometric containment

10. Spatial monitoring
Figure 5 : Transformation of absolute location events
to application-centric callbacks

11. Implementation and performance
Bat Teleporting application
Figure 6 : Zones and buttons used in Bat Teleporting

12. Figure 7 : Event-condition-action diagram describing Bat Teleporting

14. Conclusion A fine-grained sensor system A rich data model
Provides accurate, up-to-date location information
A rich data model
Reflecting the resource information
A distributed system of persistent objects
A highly available world model
A resource monitoring system
Collecting information about the computing environment
A spatial monitoring system
allows event-based applications to be written

15. Future work
리눅스에서 자이로 센서와 시리얼 통신
사용자 위치 인식방법