NDLI: Reliable task decomposability for cooperative multi-agent systems

Content Provider	IEEE Xplore Digital Library
Author	Mohammad, M. Lin Hai
Copyright Year	2011
Description	Author affiliation: Department of Electrical and Computer Engineering, National University of Singapore, Singapore (Mohammad, M.; Lin Hai)
Abstract	One of the challenging issues in control of multi-agent systems is top-down formal design through global task decomposition such that fulfillment of local tasks result in satisfaction of the global specification. To tackle this problem, in our previous work, we proposed a divide-and-conquer approach, based on task automaton decomposition for two cooperative agents. The result proposed necessary and sufficient conditions under which a task automaton can be decomposed into its natural projections such that the parallel composition of local task automata bisimulates the original task automaton. It was also shown that for a decomposable task automaton, satisfaction of local task automata leads to the satisfaction of the global task automaton. Subsequently, this paper aims at investigating the task decomposability under failure to understand whether a previously decomposable task automaton can be still achieved by a team of two agents, in spite of some event failures. For this purpose, the result defines a notion of called passivity for failed events that reflects the redundancy of shared events and transforms the decomposability under event failures to the standard task automaton decomposability problem. Given the passivity of failed events, it is proven that a decomposable task automaton remains decomposable under failures if and only if any decision on order or choice of failed events with respect to other events can be accommodated by at least one agent; cooperative tasking of agents does not allow illegal interleaving of strings, after failures, and event failures do not impose nondeterministic local tasks. Illustrative examples are presented to elaborate the decomposability conditions under event failures and finally it is proven that under the proposed conditions, the global task can be still achieved by the team, in spite of passive event failures.
Starting Page	6550
Ending Page	6555
File Size	179278
Page Count	6
File Format	PDF
ISBN	9781457706776
ISSN	21612927
e-ISBN	9789881725592
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-22
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Chinese Assoc of Automati
Subject Keyword	Fault tolerance Multiagent systems Reliable Task Decomposition Law Automata Multi-agent Systems Decentralized Cooperative Control Closed loop systems
Content Type	Text
Resource Type	Article

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