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Fractional transformation-based decentralized robust control of a coupled-tank ...

Rahman, Muhammad Z. U.; Leiva, Victor; Ghaffar, Asim; Martin-Barreiro, Carlos; Waleed, Aashir; Cabezas, Xavier; Castro, Cecília

Petrochemical and dairy industries, waste management, and paper manufacturing fall under the category of process industries where flow and liquid control are essential. Even when liquids are mixed or chemically treated in interconnected tanks, the fluid and flow should constantly be observed and controlled, especially when dealing with nonlinearity and imperfect plant models. In this study, we propose a nonline...


Approximating the distribution of the product of two normally distributed rando...

Seijas-Macias, J. Antonio; Oliveira, Amilcar; Oliveira, Teresa A.; Leiva, Victor

The distribution of the product of two normally distributed random variables has been an open problem from the early years in the XXth century. First approaches tried to determinate the mathematical and statistical properties of the distribution of such a product using different types of functions. Recently, an improvement in computational techniques has performed new approaches for calculating related integral...


np-Charts for attribute control

Leiva, Victor; Oliveira, Amilcar

In this article, we introduce charts for attribute control considering the number of defective items, named np‐charts. These charts are preferable over charts for proportion (p) of defective items, named p‐charts, when the sample size (n) remains constant for all subgroups. The benefits of using np‐charts over p‐charts are: an easier interpretation and the fact that no calculation is required for each sample re...





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