By Jane Hillston
This is often the 1st publication featuring a stochastic extension of technique algebra, PEPA; this can be proven to be compatible for specifying a Markov approach, which could then be utilized to functionality modelling. the strategy, that is illustrated with case experiences taken from the realm of verbal exchange structures, can quite simply be used to build a number of types that may be analysed utilizing commonplace numerical thoughts. one of many significant benefits of PEPA over the normal equipment for specifying stochastic functionality types is the inherent gear for reasoning in regards to the constitution and behavior of types. within the later chapters this gear is exploited to outline 4 equivalence kin over PEPA elements. each one of those notions of equivalence has intrinsic curiosity from a technique algebra point of view. even though, also they are tested to be important in a functionality modelling context. To finish the ebook, a piece has been extra surveying fresh ends up in the realm and discussing open questions.
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Extra info for A Compositional Approach to Performance Modelling (Distinguished Dissertations in Computer Science)
The number of different components that go into making a single ‘‘system’’ can be staggering. Given this environment, it is hardly surprising that we continually hear about the ‘‘architecting’’ of IT. The role of the IT architect (and with it, both systems and corporate architectures) is growing. But was it always like this? Have we always had to architect solutions? The answer is yes, it was just different back then. This is a pertinent point on which to frame our brief view of the history of technology architectures.
This factor is affected by human resource policies, outsourcing approaches, the type of industry, internal culture, and political factors, among other things. Problems in this area tend to boil down to access to the right people with the right skills at the right time. We have experience with a government body whose policy changed from pro-contract resource to anti-contract resource, almost overnight. The IT organization was fundamentally stripped of its capability because of external inﬂuences.
The problem is the lack of a consistent approach for determining how e-business systems should be built and how they should ﬁt into the overall IT environment. All investments in technology should be based on reasoned and structured assessments, taking into account the entire IT environment (while itself being driven by business strategies). Using an architectural approach, the organization can mitigate against the collapsing event horizon by making haste in a pragmatic manner. The architecture provides the necessary processes and artifacts to allow organizations to work smarter.