The Probability Of Detection (POD) curve is a standard tool in several industries to evaluate the performance of Non Destructive Testing (NDT) procedures for the detection of harmful defects for the inspected structure. Due to new capabilities of NDT process numerical simulation, Model Assisted Probability of Detection (MAPOD) approaches have also been recently developed. In this paper, a generic and progressive MAPOD methodology is proposed. Limits and assumptions of the classical methods are enlightened, while new metamodel-based methods are proposed. They allow to access to relevant information based on sensitivity analysis of MAPOD inputs. Applications are performed on Eddy Current Non Destructive Examination numerical data.
This paper deals with the optimization of industrial asset management strategies, whose profitability is characterized by the Net Present Value (NPV) indicator which is assessed by a Monte Carlo simulator. The developed method consists in building a metamodel of this stochastic simulator, allowing to obtain, for a given model input, the NPV probability distribution without running the simulator. The present work is concentrated on the emulation of the quantile function of the stochastic simulator by interpolating well chosen basis functions and metamodeling their coefficients (using the Gaussian process metamodel). This quantile function metamodel is then used to treat a problem of strategy maintenance optimization (four systems installed on different plants), in order to optimize an NPV quantile. Using the Gaussian process framework, an adaptive design method (called quantile function expected improvement) is defined by extending in our case the well-known efficient global optimization algorithm. This allows to obtain an "optimal" solution using a small number of simulator runs.
The " Miscellany Tracts" were put forth by " Tho. Tenison " (1636-1715)1 who afterwards became Archbishop of Canterbury, but was then the Rector of a London parish, St. Martin-in-the-Fields. He had been a * Some copies of this Edition have a title-page, bearing the name of H. G. Bohn as publisher, and the date of 1846, but differing only in that reipect. * The heading adopted by Wilkin, for which I cannot find that he had any authority, is certainly misleading, for the brief and fragmentary notes which follow, although of great interest, can hardly be called "An Account of the Birds (or Fishes) found in Norfolk," as there are many species of each inhabiting or visiting the county which must have beer> well-known to Browne, but of which we find no mention. Bull-head, Armed, 41 (note), 62, 6=;.
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