By Paolo Remagnino; et al

ISBN-10: 0387229906

ISBN-13: 9780387229904

ISBN-10: 0387229914

ISBN-13: 9780387229911

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The execution monitoring system we describe herein is based on the latter. In slightly simplified terms, we can say that according to the reactive approach, the execution monitoring system attempts to maintain consistency by manipulating the schedule every time it is deemed necessary. The current state of execution of the assisted person’s tasks is provided by the environmental sensory services invoked by the execution monitor. Thus, the monitoring system follows the actual execution of activities and can properly react to the occurrence of unexpected events.

For this purpose a state machine representation is used. Every change in the state machine is triggered by an incoming message and optionally generates an output. Specifically, an e-service schema consists of two parts: the first describes its interfaces, and the latter describes the conversations of the e-service, that is, possible interactions the e-service can be involved in. In order to show how this works, we describe the e-service of a Stereo Camera Agent so that it exports the ‘still-image’ service.

2 The Execution Monitor As shown in fig. 6, contingencies are posted to the core scheduler, which is responsible for updating the constraint-based representation of the world, maintaining it perfectly consistent with the evolution of the real environment; the main issue is that updating the data stored in the representation module in accordance to the information gathered from the environment may introduce some inconsistency in the schedule representation. The execution monitor reacts to these inconsistencies as they are detected, namely attempting to take the schedule back to a consistent state, so as to keep it executable.

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Ambient intelligence : a novel paradigm by Paolo Remagnino; et al


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