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uggghhhhhh jag prutar for mycket

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Robin Clark 2013-08-31 19:01:37 +01:00
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submission_thesis/CH8_Conclusion/copy.tex
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@ -376,13 +376,13 @@ If we require FMMD to produce full FTA diagrams, we need to add these
attributes to the FMMD UML model\footnote{Top down failure mode models, such as FTA, are additionally attributes to the FMMD UML model\footnote{Top down failure mode models, such as FTA, are additionally
useful in guiding diagnostic analysis.}. useful in guiding diagnostic analysis.}.
\fmmdglossINHIBIT \fmmdglossINHIBIT
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\paragraph{Environment, operational states and inhibit gates: additions to the UML model.} \paragraph{Environment, operational states and inhibit gates: additions to the UML model.}
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FTA, in addition to using symbols borrowed from digital logic introduces three new symbols to FTA, in addition to using symbols borrowed from digital logic introduces three new symbols to
model environmental, operational state and inhibit gates; % we discuss here model environmental, operational state and inhibit gates; % we discuss here
how these can be incorporated into the FMMD model is discussed below. how these can be incorporated into the FMMD model is discussed below.
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A system will be expected to perform in a given environment. A system will be expected to perform in a given environment.
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Environment in the context of this study Environment in the context of this study
@ -488,11 +488,11 @@ are added to UML diagram in figure \ref{fig:cfg} are represented in figure \ref
\clearpage \clearpage
\subsection{Retrospective Failure Mode analysis and FMMD} \subsection{Retrospective failure mode analysis and FMMD}
The reasons for applying retrospective failure mode analysis could be: The reasons for applying retrospective failure mode analysis could be:
\begin{itemize} \begin{itemize}
\item approving previously un-assessed systems to a safety standard, %\item approving previously un-assessed systems to a safety standard,
\item to re-visit a safety analysis after a small h/w or s/w change, \item to re-visit a safety analysis after a small h/w or s/w change,
\item upon discovery of a new {\bc} {\fm}, \item upon discovery of a new {\bc} {\fm},
\item or to determine the failure mode behaviour of an previously un-assessed instrument used in safety critical verification. \item or to determine the failure mode behaviour of an previously un-assessed instrument used in safety critical verification.
@ -516,7 +516,7 @@ failure modes.
%come to light. %come to light.
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\paragraph{Retrospective Failure Mode analysis and software.} \paragraph{Retrospective failure mode analysis and software.}
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We can apply retrospective FMMD to electronic and software hybrid systems as well. We can apply retrospective FMMD to electronic and software hybrid systems as well.
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