3 research outputs found

    Mantenimiento preventivo y su incidencia en el riesgo operativo de la empresa prestadora de servicios en Chorrillos, a帽o 2021

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    En la presente investigaci贸n; tiene como finalidad, ddeterminar de qu茅 manera influye mantenimiento preventivo en el riesgo operativo de la empresa de servicios en Chorrillos, a帽o 2021 . Este estudio se basa en teor铆as relacionadas al tema de estudio que son mantenimiento preventivo y el riesgo operativo. El estudio fue aplicado, de enfoque cuantitativo y correlacional con un dise帽o no experimental de corte transversal. La poblaci贸n estuvo conformada por 50 trabajadores de la empresa prestadora de servicios. La muestra se basa en toda la poblaci贸n, se utiliz贸 como t茅cnicas las encuestas para cada variable de estudio y como instrumentos se utiliz贸 los cuestionarios. Los resultados, muestran que la variable mantenimiento preventivo tiene una relaci贸n negativa alta de -0,720 con un nivel de significancia bilateral de spearman de 0,000 con el riesgo operativo de la empresa de servicios en Chorrillos, es as铆 que se rechaza la hip贸tesis nula y se acepta la hip贸tesis alterna; esto es el mantenimiento preventivo se relaciona de manera inversa y significativa con el riesgo operativo. Se concluye quie existe relaci贸n entre las variables

    Machine Learning-Based Data and Model Driven Bayesian Uncertanity Quantification of Inverse Problems for Suspended Non-structural System

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    Inverse problems involve extracting the internal structure of a physical system from noisy measurement data. In many fields, the Bayesian inference is used to address the ill-conditioned nature of the inverse problem by incorporating prior information through an initial distribution. In the nonparametric Bayesian framework, surrogate models such as Gaussian Processes or Deep Neural Networks are used as flexible and effective probabilistic modeling tools to overcome the high-dimensional curse and reduce computational costs. In practical systems and computer models, uncertainties can be addressed through parameter calibration, sensitivity analysis, and uncertainty quantification, leading to improved reliability and robustness of decision and control strategies based on simulation or prediction results. However, in the surrogate model, preventing overfitting and incorporating reasonable prior knowledge of embedded physics and models is a challenge. Suspended Nonstructural Systems (SNS) pose a significant challenge in the inverse problem. Research on their seismic performance and mechanical models, particularly in the inverse problem and uncertainty quantification, is still lacking. To address this, the author conducts full-scale shaking table dynamic experiments and monotonic & cyclic tests, and simulations of different types of SNS to investigate mechanical behaviors. To quantify the uncertainty of the inverse problem, the author proposes a new framework that adopts machine learning-based data and model driven stochastic Gaussian process model calibration to quantify the uncertainty via a new black box variational inference that accounts for geometric complexity measure, Minimum Description length (MDL), through Bayesian inference. It is validated in the SNS and yields optimal generalizability and computational scalability
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