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1
tesis de grado
Publicado 2025
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La presente tesis propone la implementación del algoritmo Practical Non-linear Model Predictive Control (PNMPC) para controlar el lazo de nivel del Módulo de laboratorio FESTO, el cual se compone de un sistema de dos tanques en cascada conectados por un circuito cerrado donde fluye agua. El PNMPC es un algoritmo de control que soluciona el problema de la no linealidad de los sistemas de nivel sin comprometer el rendimiento del proceso control. Para llevar a efecto esta estrategia de control se ha escrito un código en MATLAB que envía y recibe datos de la planta mediante la arquitectura de comunicación OPC UA a un PLC, que se encarga de operar los componentes del Módulo FESTO. También, se aplicó técnicas de control, usualmente, vistas en los cursos de automatización tales como el controlador PI y el controlador Generalize Predictive Control (GPC) para comparar su rendimiento con...
2
tesis doctoral
Publicado 2023
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State-of-the-art control and robotics challenges have long been tackled using model-based control methods like model predictive control (MPC) and reinforcement learning (RL). These methods excel in complex dynamic domains, such as manipulation tasks, but struggle with real-world issues like wear-and-tear, uncalibrated sensors, and misspecifications. These factors often perturb system dynamics, leading to the 'reality gap' problem when robots transition from simulations to real-world environments. This work aims to bridge this gap by combining RL and control in a learning framework that adapts MPC to robot decisions, optimizing performance despite uncertainties in dynamics model parameters. This thesis presents three key contributions to robotics control. The first is a novel reward-based framework for refining stochastic Model Predictive Control (MPC). It utilizes Bayesian Optimization (...
3
artículo
Publicado 2008
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The predictive control (MPC) is an advanced control strategy widely used in industrial processes. MPC is also one of the most active areas of research in the theory of control. Subjects such as optimality, stability and robustness are well known, especially for linear systems. However, despite this large adoption, both in the media industry and academics, little has been written about how these drivers are implemented in practice. This article tries to fill this gap, introducing the development of systems optimization and MPC, and discussing their integration into a hierarchical control structure. The proposed integrated control scheme is applied to the Tennessee Eastman plant, and the results show the effectiveness of the proposed strategy for optimal control of processes.
4
artículo
Publicado 2008
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The predictive control (MPC) is an advanced control strategy widely used in industrial processes. MPC is also one of the most active areas of research in the theory of control. Subjects such as optimality, stability and robustness are well known, especially for linear systems. However, despite this large adoption, both in the media industry and academics, little has been written about how these drivers are implemented in practice. This article tries to fill this gap, introducing the development of systems optimization and MPC, and discussing their integration into a hierarchical control structure. The proposed integrated control scheme is applied to the Tennessee Eastman plant, and the results show the effectiveness of the proposed strategy for optimal control of processes.
5
artículo
Publicado 2020
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Introduction. Neonatal hypoglycemia is the most common and early metabolic disorder of the newborn, which can cause everything from transient irritability to states of seizure, apnea and death. The objective was to determine the risk factors associated with hypoglycemia in term newborns in a public hospital in northern Peru by creating a predictive model using logistic regression. Material and methods: The study presented a 1:1 paired case-control design, with a sample of 58 cases and 58 controls, based on the presence or absence of neonatal hypoglycemia. Maternal and neonatal variables were analyzed: gestational age, weight of the newborn, sex of the newborn, type of delivery, use of steroids, induction of labor, being the child of a diabetic mother, intrauterine growth restriction (IUGR), mother with pre-birth hydroelectrolytic disorder, meconium aspiration syndrome, and perinatal stre...
6
tesis de grado
Publicado 2010
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The main purpose of this research is to present a solution that enable to manage efficient and reliable way, all of the information in relation to control, tracking and the hospital equipment maintenance. So, was taken as an object of study of Engineering Department of the Central Hospital of the Air Force of Peru, which presents a lot of administrative deficiencies character in its internal processes of reception, record and closing of Work Orders as well as the preventive and corrective maintenance of the hospital equipment of the HCFAP.The contemplated solution comprises from analysis and design to the development of some use cases more significant of the application.
7
artículo
Publicado 2001
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This work presents the behavior of Model-Based Predictive Control (MBPC), aimed at controlling a SISO process. The process is a non-linear system, to which after linearizing and discretizing, predictive control techniques are applied. The nonlinear process (plant) consists of a DC servomotor with reduction, a power stage and a rod coupled to the motor rotor. Use is made of a LAB-PC+ interface card (implemented in a Pentium microcomputer) and an auxiliary interface. The software used for the simulation is MATLAB and the one used for the implementation of the position control algorithm is the C language. The results presented are in real time. For reasons of space Simulations have not been presented in this article.
8
tesis de maestría
Publicado 2017
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The aim of this Master's Thesis was to develop a naturally controllable BCI that can predict motion trajectories from the imagination of motor execution. The approach to reach this aim was to nd a correlation between movement and brain data, which can subsequently be used for the prediction of movement trajectories only by brain signals. To nd this correlation, an experiment was carried out, in which a participant had to do triggered movements with its right arm to four di erent targets. During the execution of the movements, the kinematic and EEG data of the participant were recorded. After a preprocessing stage, the velocity of the kinematic data in x and y directions, and the band power of the EEG data in di erent frequency ranges were calculated and used as features for the calculation of the correlation by a multiple linear regression. When applying the resulting regression paramete...
9
tesis de maestría
Publicado 2017
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The aim of this Master's Thesis was to develop a naturally controllable BCI that can predict motion trajectories from the imagination of motor execution. The approach to reach this aim was to nd a correlation between movement and brain data, which can subsequently be used for the prediction of movement trajectories only by brain signals. To nd this correlation, an experiment was carried out, in which a participant had to do triggered movements with its right arm to four di erent targets. During the execution of the movements, the kinematic and EEG data of the participant were recorded. After a preprocessing stage, the velocity of the kinematic data in x and y directions, and the band power of the EEG data in di erent frequency ranges were calculated and used as features for the calculation of the correlation by a multiple linear regression. When applying the resulting regression paramete...
10
artículo
Publicado 2016
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Since the efficacy of phototherapy has been demonstrated, it has become the main method for the prevention and treatmentof hyperbilirubinemia in the neonate with neonatal jaundice. Therefore, the objective of this project is to decrease the abnormallevel of bilirubin in the blood with innovation tools and to place it at low risk levels. For this, the proposed design consists ofa blue light source, which offers a uniform light distribution throughout the neonate’s surface; A control system that ensuresthe level of constant irradiance throughout the treatment, a noninvasive predictive method to determine the level of bilirubinin the neonate and a programmable interface that allows to suggest the most effective type of treatment. Electrical hazardsaccording to IEC 60601-1 standard for medical equipment are included.
11
artículo
Publicado 2016
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Since the efficacy of phototherapy has been demonstrated, it has become the main method for the prevention and treatmentof hyperbilirubinemia in the neonate with neonatal jaundice. Therefore, the objective of this project is to decrease the abnormallevel of bilirubin in the blood with innovation tools and to place it at low risk levels. For this, the proposed design consists ofa blue light source, which offers a uniform light distribution throughout the neonate’s surface; A control system that ensuresthe level of constant irradiance throughout the treatment, a noninvasive predictive method to determine the level of bilirubinin the neonate and a programmable interface that allows to suggest the most effective type of treatment. Electrical hazardsaccording to IEC 60601-1 standard for medical equipment are included.
12
artículo
Publicado 2017
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The pregnancy in the bitch occurs between fertilization and whelping, and its length has clinical importance. The complex biology of the gametes and embryos influences the length of the gestation, where the physiological period fluctuates from 57 to 70 days. This wide range can be influenced by the referential methods used to estimate the starting day. Controlled natural mating or artificial insemination based on the detection of ovulation allows reducing the range from 62 to 64 days. A high impact obstetric condition is the gestation of only one puppy, which tends to be longer, representing high risk of dystocia. Given the clinical relevance of a suitable projection of the length of the gestation and the prediction of the whelping date, mathematical formulas to calculate the fetal age and the whelping day have been developed with the systematization of gestational ultrasound.
13
artículo
Objective: To establish the usefulness of cervicovaginal interleukin-6 concentrations for the prediction of preterm delivery. Design: Case-control study. Setting: Hospital Central “Dr. Urquinaona”, Maracaibo, Venezuela. Participants: Patients with preterm delivery (group A), as cases, and pregnant women with term delivery (group B), considered as controls. Interventions: Cervicovaginal secretion samples were obtained from both the external cervical os and vaginal fornix between 24 and 28 weeks of pregnancy. All patients were followed until delivery. Main outcome results: General characteristics, cervicovaginal interleukin-6 concentrations, and prognostic efficacy. Results: Mean gestational age at measurement of interleukin-6 cervicovaginal concentrations was 26.2 +/- 1.1 weeks in group A and 25.9 +/- 1.1 weeks in group B (p = ns). There were no significant differences in maternal age...
14
artículo
Publicado 2015
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Objectives: To determine cervical length measured by transvaginal ultrasound between 22 and 24 weeks’ gestation in the prediction of spontaneous preterm birth. Design: Observational analytic cohort type study. Setting: Fetal Medicine Unit, Instituto Nacional Materno Perinatal, Lima, Peru. Participants: Pregnant women with single gestation. Interventions: Cervical length was measured by transvaginal ultrasound in 1 218 pregnant women during routine prenatal care, between 22 to 24 weeks of gestation, in a tertiary hospital center. Main outcome measures: Cervical length measured at 22-24 weeks of gestation and its correlation with spontaneous preterm delivery. Results: The incidence of spontaneous preterm delivery was 11,8%. Cervical length was normally distributed. Mean (+/- SD) cervical length was 35,1 +/- 8,5 mm (range, 11-72 mm). Cervical length, history of preterm delivery, multi...
15
artículo
Objective. Determine the study of the diagnostic test of the prediction nomogram for the risk of preeclampsia. Material and method. A nested case-control analytical observational study and validation of the proposed prediction index was performed with the design of a nomogram. It was performed at the Guillermo Almenara Irigoyen-EsSalud Hospital, Lima-Peru, and Fetal Medicine Unit. Participated asymptomatic pregnant patients of the Almenara-EsSalud Healthcare Network between the first or second trimester of pregnancy that developed or not at the end of the follow-up severe preeclampsia. The clinical, laboratory and Doppler predictors of the uterine arteries were evaluated. The data obtained were analyzed under a multivariate binary logistic regression model to construct the prediction equation and the prediction nomogram. In addition, the ROC curve analysis was performed. Results. Th...
16
artículo
Objective. Determine the study of the diagnostic test of the prediction nomogram for the risk of preeclampsia. Material and method. A nested case-control analytical observational study and validation of the proposed prediction index was performed with the design of a nomogram. It was performed at the Guillermo Almenara Irigoyen-EsSalud Hospital, Lima-Peru, and Fetal Medicine Unit. Participated asymptomatic pregnant patients of the Almenara-EsSalud Healthcare Network between the first or second trimester of pregnancy that developed or not at the end of the follow-up severe preeclampsia. The clinical, laboratory and Doppler predictors of the uterine arteries were evaluated. The data obtained were analyzed under a multivariate binary logistic regression model to construct the prediction equation and the prediction nomogram. In addition, the ROC curve analysis was performed. Results. Th...
17
artículo
Publicado 2015
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Objectives: To determine cervical length measured by transvaginal ultrasound between 22 and 24 weeks’ gestation in the prediction of spontaneous preterm birth. Design: Observational analytic cohort type study. Setting: Fetal Medicine Unit, Instituto Nacional Materno Perinatal, Lima, Peru. Participants: Pregnant women with single gestation. Interventions: Cervical length was measured by transvaginal ultrasound in 1 218 pregnant women during routine prenatal care, between 22 to 24 weeks of gestation, in a tertiary hospital center. Main outcome measures: Cervical length measured at 22-24 weeks of gestation and its correlation with spontaneous preterm delivery. Results: The incidence of spontaneous preterm delivery was 11,8%. Cervical length was normally distributed. Mean (+/- SD) cervical length was 35,1 +/- 8,5 mm (range, 11-72 mm). Cervical length, history of preterm delivery, multi...
18
artículo
Publicado 2023
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Objective. The objective of the study was to explore predictive variables of mortality in patients with COPD in Colombia. Materials and methods. Case-control study, in adult patients, diagnosed with COPD, treated at the clínica Comfamiliar, Risaralda, from January 1, 2015 to December 31, 2018. Deceased patients were called cases, and the control group was survivors. A data collection instrument validated by expert judgement was used. A multivariate logistic regression analysis was performed, followed by post-modeling analysis for validation. The analyzes were carried out in Stata 14, official version. It was considered significant with p value <0.05. The project was approved by the bioethics committee of the clínica Comfamiliar. Results. 230 patients with a diagnosis of COPD were included. The mortality rate was 10%, for which there were 23 cases. In the multivariate analysis, the p...
19
artículo
The objective of the study was to determine the predictive value of personality traits according to the Mexican model of the Five Personality Factors in the Burnout Syndrome (BOS) and its dimensions from the Gil-Monte model. Three hundred and seventy-five basic education teachers from Mexico City took part in it. The sampling was intentional, non-probabilistic with cross-sectional and correlational design. The Spanish Burnout Syndrome inventory and the Mexican Five Personality Factors scale were used. Pearson's Correlation Test and a stepwise linear regression model were employed for the analysis. With the exception of Emotional Control and Enthusiasm towards work (r2=.087; p>0.05), the results found significant correlations of the Five Mexican personality factors and BOS, negative in the case of personality traits and Psychic Burnout, Indolence, and Guilt; and positive among personal...
20
artículo
Meta-analyses show that the correlations of approaches to learning with academic achievement are low. However, only one study has controlled these correlations in the presence of intelligence. Our study investigates the incremental validity of the surface and deep approaches taking cognitive abilities as control and applied the multiple linear regression and CART regression tree method in a diversified sample of high school students from Minas Gerais, Brazil. We found a prediction of 20.37% and 35.20% of the outcome variance, through the linear regression and CART, respectively. Our results show that although cognitive abilities are more important than students’ approaches, the approaches have incremental validity and important roles as predictors of academic achievement.
