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FINAL because I am going down the pub

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Robin Clark 2011-06-28 18:12:23 +01:00
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15
fmmd_concept/System_safety_2011/submission.tex
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@ -73,7 +73,7 @@ failure mode of the component or sub-system}}}
% numbers at outer edges % numbers at outer edges
\pagenumbering{arabic} % Arabic page numbers hereafter \pagenumbering{arabic} % Arabic page numbers hereafter
\author{R.Clark$^\star$ , A.~Fish$^\dagger$ , C.~Garrett$^\dagger$, J.~Howse$^\dagger$ \\ \author{R.Clark$^\star$ , A.~Fish$^\dagger$ , C.~Garrett$^\dagger$, J.~Howse$^\dagger$ \\
$^\star${\em Energy Technology Control, 25 North Street, Lewes, BN7 2PE, UK} \and $^\dagger${\em University of Brighton, UK} $^\star${\em Energy Technology Control, UK. r.clark@energytechnologycontrol.com} \and $^\dagger${\em University of Brighton, UK}
} }
%\title{Developing a rigorous bottom-up modular static failure mode modelling methodology} %\title{Developing a rigorous bottom-up modular static failure mode modelling methodology}
@ -203,7 +203,7 @@ If $E$ is the number of environmental conditions to consider
in a system, and $A$ the number of applied/operational states (or modes of the system), in a system, and $A$ the number of applied/operational states (or modes of the system),
the bottom-up analyst is presented with two the bottom-up analyst is presented with two
additional %cross product additional %cross product
factors, factors, yielding approximately
$(N-1) \times N \times K \times E \times A$. $(N-1) \times N \times K \times E \times A$.
% %
If we put some typical very small embedded system numbers\footnote{These figures would If we put some typical very small embedded system numbers\footnote{These figures would
@ -364,12 +364,12 @@ that interact to provide
a function or task within a system. a function or task within a system.
% %
In the proposed methodology components are collected into functional groups In the proposed methodology components are collected into functional groups
and each component failure (and optionally combinations) are considered in the and each component failure (and possibly multiple simultaneous component failures) are considered in the
context of the {\fg}. context of the {\fg}.
%% GARK %% GARK
% %
The component failures (and optional combinations) are termed {\em{\fcs}}. %`test~cases'. The component failures are termed {\em{\fcs}}. %`test~cases'.
For each {\fc} For each {\fc}
there will be a corresponding resultant failure, or `symptom', from the perspective of the {\fg}. there will be a corresponding resultant failure, or `symptom', from the perspective of the {\fg}.
% %
@ -1269,7 +1269,12 @@ Furthermore the reasoning path is traceable. By being able to trace a
top level event down through derived components, to base component top level event down through derived components, to base component
failure modes, with each step annotated as {\fcs}, the model is easier to maintain. failure modes, with each step annotated as {\fcs}, the model is easier to maintain.
\paragraph{Future work}
\begin{itemize}
\item To provide bounds on the size of the state space for the application of the methodology to certain classes of systems.
\item To build a {\dcs} library of common electrical, mechanical and software models (i.e. a collection of worked example {\dcs}).
\item To provide formal generic translations from the constructed model of any given system to the other models.
\end{itemize}
%\today %\today
% %
{ %\tiny %\footnotesize { %\tiny %\footnotesize