By Jane Hillston
This is often the 1st e-book offering a stochastic extension of technique algebra, PEPA; this is often proven to be appropriate for specifying a Markov procedure, that can then be utilized to functionality modelling. the strategy, that's illustrated with case stories taken from the world of conversation structures, can without difficulty be used to build numerous versions that may be analysed utilizing regular numerical suggestions. one of many significant benefits of PEPA over the normal tools for specifying stochastic functionality types is the inherent gear for reasoning concerning the constitution and behavior of versions. within the later chapters this equipment is exploited to outline 4 equivalence kinfolk over PEPA elements. every one of those notions of equivalence has intrinsic curiosity from a procedure algebra viewpoint. despite the fact that, also they are proven to be beneficial in a functionality modelling context. To finish the e-book, a piece has been extra surveying fresh ends up in the realm and discussing open questions.
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Additional resources for A Compositional Approach to Performance Modelling (Distinguished Dissertations in Computer Science)
But they avoid some of the problems of C&L's formalism by using a syntactic theory as opposed to a modal theory. The important part of their work is that goals and intentions are linked to actions of agents, and the time it takes to perform an action. As with R&G's formalism, goals are distinguished from desires by requiring them to be consistent. The authors state that use of syntactic theories allow reasoning to be done at a symbolic level, and further more, avoids the problem o f consequential closure of modal theories.
This knowledge is assumed to be known at compile-time. Plans of a team are the intersection of plan library of the team members. Skills of a team are the set of primitive actions that can be performed by the team. Individual agents may have different skills, and composite teams may have skills not possessed by their members. Role of a team member in the plan, is the part of the plan to be undertaken by that team member. The definition of joint intentions of a team towards a plan is refined in terms of the joint intentions and mutual beliefs of the role-players of the joint plan towards respective role-plans.
Therefore, this framework does not permit situation based evaluations for making such decisions. Such a requirement seem to be shifted by assuming a deliberation function which chooses an appropriate plan (assuming that the plan library has both an individual and a social plan for achieving the same goal), but the theory does not address it explicitly. As a concluding remark, the results of this work with regards to the practical aspects of joint intentions and cooperative activity are very encouraging.