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