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The problem of modelling of casual perturbances influencing functioning of complex systems is considered. The approach for correction of the known models is proposed. This approach allow reducing their methodical error without distortion of the physical principles taken as a principle of the mathematical description of casual perturbances.
Two models of processes (strategies) are suggested for software testing, using error detection probability for each software module. The Cox distribution is used for arbitrary distribution approximation of fault resolution duration. Modified labeled graphs for each strategy are built, along with differential equation systems and their numerical solutions.
This article describes theoretical and experimental studies of the noise influence in direct current measurements by means of measures of voltage and resistance, as well as by serial precision ammeters and DC current calibrators. It was shown that the shot noise restrict the measurement accuracy level of dc current in this measurement range.
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