Jorge Navarro
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View article: Three-Dimensional Convolutional Neural Network for Ultrasound Surface Echo Detection
Three-Dimensional Convolutional Neural Network for Ultrasound Surface Echo Detection Open
Ultrasound array imaging frequently employs a coupling medium to facilitate wave transmission from the transducer to the target component. Surface echoes, identified by their high-amplitude peaks, are crucial for determining the Time of Fl…
View article: Distorted distributions and ROC curves
Distorted distributions and ROC curves Open
We consider new distortion functions based on the receiver operating characteristic (ROC) and ordinal dominance (OD) curves. Various stochastic orders and aging properties are characterized by using the interpretation of ROC and OD distort…
View article: Posterior Wall Involvement During Pulmonary Vein Isolation Using the Farapulse System
Posterior Wall Involvement During Pulmonary Vein Isolation Using the Farapulse System Open
Background First approved PFA (Pulsed‐Field‐Ablation) system for pulmonary vein isolation (PVI) has been Farapulse PFA system. The aim was to assess the characteristics of the lesion made by the Farapulse system and its influence on the cl…
View article: Generalized equilibrium distributions
Generalized equilibrium distributions Open
We define the generalized equilibrium distribution, that is the equilibrium distribution of a random variable with support in $\mathbb{R}$ . This concept allows us to prove a new probabilistic generalization of Taylor’s theorem. Then, the …
View article: Deep Learning-Based Algorithms for Real-Time Lung Ultrasound Assisted Diagnosis
Deep Learning-Based Algorithms for Real-Time Lung Ultrasound Assisted Diagnosis Open
Lung ultrasound is an increasingly utilized non-invasive imaging modality for assessing lung condition but interpreting it can be challenging and depends on the operator’s experience. To address these challenges, this work proposes an appr…
View article: Predicting future failures in generalized order statistics and related models
Predicting future failures in generalized order statistics and related models Open
Quantile regression predictions are considered for generalized order statistics which extend results previously established for record values and order statistics. In order to derive the results, some (univariate and bivariate) distortion …
View article: Assessment of extreme records in environmental data through the study of stochastic orders for scale mixtures of skew normal vectors
Assessment of extreme records in environmental data through the study of stochastic orders for scale mixtures of skew normal vectors Open
Scale mixtures of skew normal distributions are flexible models well-suited to handle departures from multivariate normality. This paper is concerned with the stochastic comparison of vectors that belong to the family of scale mixtures of …
View article: New multivariate Gini's indices
New multivariate Gini's indices Open
The Gini's mean difference was defined as the expected absolute difference between a random variable and its independent copy. The corresponding normalized version, namely Gini's index, denotes two times the area between the egalitarian li…
View article: Predicting failure times of coherent systems
Predicting failure times of coherent systems Open
The article is focused on studying how to predict the failure times of coherent systems from the early failure times of their components. Both the cases of independent and dependent components are considered by assuming that they are ident…
Resolving an old problem on the preservation of the IFR property under the formation of -out-of- systems with discrete distributions Open
More than half a century ago, it was proved that the increasing failure rate (IFR) property is preserved under the formation of k -out-of- n systems (order statistics) when the lifetimes of the components are independent and have a common …
View article: A New Separation Index and Classification Techniques Based on Shannon Entropy
A New Separation Index and Classification Techniques Based on Shannon Entropy Open
The purpose is to use Shannon entropy measures to develop classification techniques and an index which estimates the separation of the groups in a finite mixture model. These measures can be applied to machine learning techniques such as d…
View article: On connections between skewed, weighted and distorted distributions: applications to model extreme value distributions
On connections between skewed, weighted and distorted distributions: applications to model extreme value distributions Open
The purpose of the paper is to explore the connections between skew symmetric, weighted and distorted univariate distributions as well as how they appear related to the distributions of the extreme values in a sample of identically distrib…
View article: Method-of-moments estimators of a scale parameter based on samples from a coherent system
Method-of-moments estimators of a scale parameter based on samples from a coherent system Open
In this paper, we study the estimation of a scale parameter from a sample of lifetimes of coherent systems with a fixed structure. We assume that the components are independent and identically distributed having a common distribution which…
View article: A variance-based importance index for systems with dependent components
A variance-based importance index for systems with dependent components Open
This paper proposes a variance-based measure of importance for coherent\nsystems with dependent and heterogeneous components. The particular cases of\nindependent components and homogeneous components are also considered. We model\nthe dep…
View article: A new method to project portfolio selection with multiple interacting criteria hierarchically structured
A new method to project portfolio selection with multiple interacting criteria hierarchically structured Open
Project portfolio selection is very complex. Often the multiple criteria used to assess projects are hierarchically structured and show interaction. Most of these criteria are also used at portfolio level to assess the supported projects a…
View article: Inter-rater Variability in the Evaluation of Lung Ultrasound on Videos Acquired from COVID-19 Patients
Inter-rater Variability in the Evaluation of Lung Ultrasound on Videos Acquired from COVID-19 Patients Open
Lung ultrasound (LUS) allows the detection of a series of manifestations of COVID-19 such as B lines and consolidations. The objective of this work was to study the inter-rater reliability (IRR) when detecting signs associated with COVID-1…
View article: Predicting future failure times by using quantile regression
Predicting future failure times by using quantile regression Open
The purpose of the paper is to study how to predict the future failure times in a sample from the early failures (type II censored data). We consider both the case of independent and dependent lifetimes. In both cases we assume identically…
View article: A note on the limiting behaviour of hazard rate functions of generalized mixtures
A note on the limiting behaviour of hazard rate functions of generalized mixtures Open
The mixtures are popular models in probability and statistics. They represent populations made up with different groups. Their distributions are linear combinations with positive weights of the baseline distribution functions. They can be …
View article: Discussion of an overview of some classical models and discussion of the signature‐based models of preventive maintenance
Discussion of an overview of some classical models and discussion of the signature‐based models of preventive maintenance Open
Asadi et al.1 develop an excellent overview on the preventive maintenance (PM) procedures for coherent systems based on classical (Samaniego) signatures and survival signatures. Two different approaches are considered. In the first one the…
View article: Reactor Physics Simulations of the High Flux Isotope Reactor Permanent Beryllium Reflector Number 5 Design
Reactor Physics Simulations of the High Flux Isotope Reactor Permanent Beryllium Reflector Number 5 Design Open
This study evaluates reactor physics aspects of the proposed High Flux Isotope Reactor (HFIR) permanent beryllium reflector number 5 design. HFIR is a pressurized, light water–cooled, and beryllium reflected research reactor that operates …
View article: Preliminary Thermal-Hydraulic Analysis of the UTA–2 Subcritical Linear Accelerator–Driven System
Preliminary Thermal-Hydraulic Analysis of the UTA–2 Subcritical Linear Accelerator–Driven System Open
The National Nuclear Security Administration’s mission includes establishing a reliable supply of 99Mo without highly enriched uranium. Oak Ridge National Laboratory (ORNL) supports this objective through collaborative research and develop…