ON THE EXTENDED CHEN'S AND PHAM'S SOFTWARE RELIABILITY MODELS. SOME APPLICATIONS

The Hausdorff approximation of the impulse function σ∗∗(t) by sigmoidal functions based on the extended Chen’s and Pham’s cumulative functions are studied and an expression for the error of the best approximation is found. The received results are of independent significance in the study of issues related to neural networks and impulse technics. Using programming environment Mathematica we give results of many numerical examples which confirm the theory presented here. We give also real examples with data provided in [4] using extended Chen’s software reliability model and extended Pham’s deterministic software reliability model. Dataset included [5] Year 2000 compatibility modifications, operating system upgrade, and signaling message processing. Some direct comparisons are made. AMS Subject Classification: 41A46

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