While the dependability requirements of distributed real-time
systems are expanding, there is currently no framework for defining
and mapping these requirements into the system design and
operation. A method of controlling and achieving the dependability
level is real-time monitoring, which measures the degree of
requirements fulfilment, relates it to the pre-defined, measurable
system-level expectations and dynamically adapts the system, based
on quality metrics, risk analysis, cost evaluation, control theory,
neural networks, data acquisition and system knowledge management.
The book deduces a framework to reveal, define, quantify, measure,
analyse, design, implement, test, monitor and enhance dependability
(functional and non-functional) requirements of a distributed
system with real-time constraints. It is presented how the
framework can be applied throughout all life-cycle stages, under
varying constraints and with maximised cost effectiveness. An
overview of the tools and methodologies applicable has been given
and an integrated and generalised architecture for ensuring
continuous fulfilment of system requirements, proposed. The
framework provides a multilevel specification mechanism to
establish the preservation of system requirements. This ensures the
correct functioning of system through adaptations at run time.
Among the benefits are controlled access and coordinated resource
sharing in accordance with service-level agreement policies,
multi-stakeholder interest preservation, transparency with respect
to location, naming, performance etc., achievement of quality of
service on demand, decentralisation, seamless integration of
resources and applications, as well as increased predictability.
READERSHIP: The intended audience is broad: real time and
distributed systems scientists and developers, software engineers,
students, quality assurance managers, contractors, users, service
providers and all those searching for an alternative approach to
handling and ensuring automated control of fulfilment of system
requirements. Moreover, those needing a handbook on contract
negotiations and a method of tracing operational results back into
system requirements of long lived projects with high dependability
and integrity demands.
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