1. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg Reconfigurable Context Sensitive Middleware Smart Classroom Tasks RCSM Parts Critics Presentation of the paper from Stephen S. Yau et al., University of Arizona: „Reconfigurable context sensitive middleware for pervasive computing“, IEEE Pervasive Volume 1, Issue 3 July-Sept. 2002

2. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM: Smart Classroom Present: Instructor presenting teaching material. Know position of teacher, find students PDAs and transmit data. Group Work: Small groups solving problems. Spontaneous groups, teacher can enter and leave each group

3. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM Tasks: Context Definition: Context is any detectable and relevant attibute of a device, ist interaction with other devices and ist surrounding environment at an instant of time Categories: device-specific, environment-specific, user-specific

4. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM Tasks: Situation Definition: Situation awareness is the capability of a device to capture and analyse the relationship among multiple contexts and actions over a period of time. Situation is accumulation of context values for a period of time. Situation contains the notion of device behaviour as consequence of it.

5. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM Parts Designed with existing applications in mind Hides aquisition of context from application Framework to call user-supplied actions upon situations Includes communication channels and device discovery Partly implemented in hardware

6. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg

7. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM Parts: Interface Definition Context-Aware Interface Definition Language (CA-IDL) Interface Compiler generates Adaptive Object Container (ADC) Definition of context and situations, and of methods to call in those situations

8. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM Parts: R-ORB RCSM Object Request Broker Transparent ad hoc communication Collect sensor data for the ADC Connect to other R-ORBs using the RCSM General inter-ORB protocol (R-GIOP) Independant of underling network technology

9. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg RCSM Parts: Hardware RCSM is a combined Hardware-Software solution User application and ADC in software, R- ORB in hardware (FPGA) A software only version is being developped.

10. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg

11. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg Conclusion Benefits: Facilitate application development, ad hoc communication Critics: only one example, hardware approach General ubicomp critics: always-on or standby, protection of personal data

12. 20.3.2003RCSM, David Buchmann Seminar Ubicomp, Uni Fribourg Questions? Fragen?