Jorge Rivera
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View article: Hardware/Software Partitioning Based on Area and Memory Metrics: Application to a Fuzzy Controller Algorithm for a DC Motor
Hardware/Software Partitioning Based on Area and Memory Metrics: Application to a Fuzzy Controller Algorithm for a DC Motor Open
In hardware/software (HW/SW) partitioning, the most commonly established objectives are execution time, power consumption, and hardware area. Surprisingly, memory usage, a critical resource in embedded systems, has received limited attenti…
View article: Design of Stable Signed Laplacian Matrices with Mixed Attractive–Repulsive Couplings for Complete In-Phase Synchronization
Design of Stable Signed Laplacian Matrices with Mixed Attractive–Repulsive Couplings for Complete In-Phase Synchronization Open
Synchronization in complex networks mainly considers positive (attractive) couplings to guarantee network stability. However, in many real-world systems or processes, negative (repulsive) interactions exist, and this poses a challenging pr…
View article: Assessment of Inspiratory Muscle Function and Glenohumeral Motion in the Throwing Arm of Division I Collegiate Baseball Players
Assessment of Inspiratory Muscle Function and Glenohumeral Motion in the Throwing Arm of Division I Collegiate Baseball Players Open
This study examined the relationships of inspiratory performance (IP) to characteristics of Division 1 Collegiate baseball players (D1CBP). 30 D1CBP were recruited. The Test of Incremental Respiratory Endurance (TIRE) provides maximal insp…
View article: Advanced PLC-SCADA System for Toxic Solvent Mixing Process Control and Monitoring
Advanced PLC-SCADA System for Toxic Solvent Mixing Process Control and Monitoring Open
Industries that work with dangerous solvents struggle with control of level, flow, and consistency as a result of the high toxicity of these solvents. This study, aims to solve these problems, using a Programmable Logic Controller (PLC) eq…
View article: A Reduced Hardware SNG for Stochastic Computing
A Reduced Hardware SNG for Stochastic Computing Open
Stochastic Computing (SC) is an alternative way of computing with binary weighted words that can significantly reduce hardware resources. This technique relies on transforming information from a conventional binary system to the probabilit…
View article: Towards On-Board SAR Processing with FPGA Accelerators and a PCIe Interface
Towards On-Board SAR Processing with FPGA Accelerators and a PCIe Interface Open
This article addresses a novel methodology for the utilization of Field Programmable Gate Array (FPGA) accelerators in on-board Synthetic Aperture Radar (SAR) processing routines. The methodology consists of using High-Level Synthesis (HLS…
View article: Sliding Mode Regulation of a Boost Circuit for DC-Biased Sinusoidal Power Conversion
Sliding Mode Regulation of a Boost Circuit for DC-Biased Sinusoidal Power Conversion Open
The boost converter is mostly used as a DC–DC converter, but two boost converter power stages can be configured to perform the DC–AC conversion. In this case, the control system of the power stage must be designed for trajectory tracking (…
View article: A Step-Up Converter with Large Voltage Gain and Low Voltage Rating on Capacitors
A Step-Up Converter with Large Voltage Gain and Low Voltage Rating on Capacitors Open
Step-up converters are widely used in many applications, such as renewable energy generation with photovoltaic panels and fuel cell stacks. In many cases, the required voltage gain is larger for those applications than a traditional boost …
View article: Suitability Classification of Retinal Fundus Images for Diabetic Retinopathy Using Deep Learning
Suitability Classification of Retinal Fundus Images for Diabetic Retinopathy Using Deep Learning Open
Diabetic retinopathy (DR) is the primary cause of blindness in developing and developed countries. Early-stage DR detection reduces the risk of blindness in Diabetes Mellitus (DM) patients. There has been a sharp rise in the prevalence of …
View article: Wandering astray: Teenagers' choices of schooling and crime
Wandering astray: Teenagers' choices of schooling and crime Open
We build and estimate a dynamic model of teenagers' choices of schooling and crime, incorporating four factors that may contribute to the different paths taken by different teenagers: heterogeneous endowments, unequal opportunities, uncert…
View article: Spelling Correction Real-Time American Sign Language Alphabet Translation System Based on YOLO Network and LSTM
Spelling Correction Real-Time American Sign Language Alphabet Translation System Based on YOLO Network and LSTM Open
In this paper, we present a novel approach that aims to solve one of the main challenges in hand gesture recognition tasks in static images, to compensate for the accuracy lost when trained models are used to interpret completely unseen da…
View article: Implementing blopmatching in Stata
Implementing blopmatching in Stata Open
The blopmatching estimator for average treatment effects in observational studies is a nonparametric matching estimator proposed by Díaz, Rau, and Rivera (2015, Review of Economics and Statistics 97: 803–812). This approach uses the soluti…
View article: Nested High Order Sliding Mode Controller with Back-EMF Sliding Mode Observer for a Brushless Direct Current Motor
Nested High Order Sliding Mode Controller with Back-EMF Sliding Mode Observer for a Brushless Direct Current Motor Open
This work presents a nested super-twisting second-order sliding mode speed controller for a brushless direct current motor with a high order sliding mode observer used for back electromotive force (back-EMF) estimation. Due to the trapezoi…
View article: Wandering Astray: TeenagersA Choices of Schooling and Crime
Wandering Astray: TeenagersA Choices of Schooling and Crime Open
We build and estimate a dynamic model of teenagers' choices of schooling and crime, incorporating four factors that may contribute to the different routes taken by different teenagers: heterogeneous endowments, unequal opportunities, uncer…
View article: Wandering Astray: Teenagers' Choices of Schooling and Crime
Wandering Astray: Teenagers' Choices of Schooling and Crime Open
We build and estimate a dynamic model of teenagers' choices of schooling and crime, incorporating four factors that may contribute to the different routes taken by different teenagers: heterogeneous endowments, unequal opportunities, uncer…
View article: SoC Design Based on a FPGA for a Configurable Neural Network Trained by Means of an EKF
SoC Design Based on a FPGA for a Configurable Neural Network Trained by Means of an EKF Open
This work presents a configurable architecture for an artificial neural network implemented with a Field Programmable Gate Array (FPGA) in a System on Chip (SoC) environment. This architecture can reproduce the transfer function of differe…
View article: Automatic Tool for Fast Generation of Custom Convolutional Neural Networks Accelerators for FPGA
Automatic Tool for Fast Generation of Custom Convolutional Neural Networks Accelerators for FPGA Open
This paper presents a platform that automatically generates custom hardware accelerators for convolutional neural networks (CNNs) implemented in field-programmable gate array (FPGA) devices. It includes a user interface for configuring and…
View article: Sliding Mode Output Regulation for a Boost Power Converter
Sliding Mode Output Regulation for a Boost Power Converter Open
This work deals with the novel application of the sliding mode (discontinuous) output regulation theory to a nonlinear electrical circuit, the so-called boost power converter. This theory has excelled due to the fact that trajectory tracki…
View article: Nested High Order Sliding Mode Controller Applied to a Brushless Direct Current Motor
Nested High Order Sliding Mode Controller Applied to a Brushless Direct Current Motor Open
A nested high order sliding mode controller is proposed for speed control of a brushless direct current motor using an extended park transformation. Conventional park transformation applied to non sinusoidal back electromotive force motors…
View article: A Novel Sliding Mode Control Scheme for a PMSG-Based Variable Speed Wind Energy Conversion System
A Novel Sliding Mode Control Scheme for a PMSG-Based Variable Speed Wind Energy Conversion System Open
This work proposes a novel control scheme for a variable speed wind turbine system based on the permanent magnet synchronous generator. Regions II and III for a wind speed profile are considered, hence the control is designed for maximizin…
View article: American Sign Language Alphabet Recognition Using a Neuromorphic Sensor and an Artificial Neural Network
American Sign Language Alphabet Recognition Using a Neuromorphic Sensor and an Artificial Neural Network Open
This paper reports the design and analysis of an American Sign Language (ASL) alphabet translation system implemented in hardware using a Field-Programmable Gate Array. The system process consists of three stages, the first being the commu…
View article: Discrete–time Field Oriented Control for Induction Motors
Discrete–time Field Oriented Control for Induction Motors Open
In this work it is proposed a discrete–time field oriented control for induction motors. From a discrete–time stationary reference frame model for an induction motor, obtained by a variational integrator, the model is converted to a field …
View article: Implementation of SoC Based Real‐Time Electromagnetic Transient Simulator
Implementation of SoC Based Real‐Time Electromagnetic Transient Simulator Open
Real‐time electromagnetic transient simulators are important tools in the design stage of new control and protection systems for power systems. Real‐time simulators are used to test and stress new devices under similar conditions that the …
View article: A Matching Estimator Based on a Bilevel Optimization Problem
A Matching Estimator Based on a Bilevel Optimization Problem Open
This paper proposes a novel matching estimator where neighbors used and weights are endogenously determined by optimizing a covariate balancing criterion. The estimator is based on finding, for each unit that needs to be matched, sets of o…
View article: Robust Control of the Air to Fuel Ratio in Spark Ignition Engines with Delayed Measurements from a UEGO Sensor
Robust Control of the Air to Fuel Ratio in Spark Ignition Engines with Delayed Measurements from a UEGO Sensor Open
A precise control of the normalized air to fuel ratio in spark ignition engines is an essential task. To achieve this goal, in this work we take into consideration the time delay measurement presented by the universal exhaust gas oxygen se…