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751 results on '"HERNANDEZ, CESAR"'

1. A Hybrid Modelling of a Water and Air Injector in a Subsonic Icing Wind Tunnel

Author

Hernández-Hernández, César, Chevet, Thomas, Thabet, Rihab el Houda, and Langlois, Nicolas

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

The study of droplet generation in wind tunnels in conducting icing experiments is of great importance in determining ice formation on structures or surfaces, where parameters such as Liquid Water Content (LWC) and Median Volumetric Diameter (MVD) play a relevant role. The measurement of these parameters requires specialised instrumentation. In this paper, several experiments have been carried out in a subsonic wind tunnel facility to study the parameters that are part of the icing process in structures. Furthermore, a mathematical modelling of the constituent subsystems of the plant study that allow us to have a comprehensive understanding of the behaviour of the system is developed using techniques based on first principles and machine learning techniques such as regression trees and neural networks. The simulation results show that the implementation of the model manages to obtain prominent expected values of LWC and MVD within the range of values obtained in the real experimental data., Comment: 11 pages, 14 figures

Published
2024

5. Do We Know How to Use a Fire Extinguisher? Training Unexperienced Citizens with Virtual Reality

Author

Cartiel, Antonio Ruiz, Asión-Suñer, Laura, García-Hernández, César, Ubieto-Artur, Pedro, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Manchado del Val, Cristina, editor, Suffo Pino, Miguel, editor, Miralbes Buil, Ramón, editor, Moreno Sánchez, Daniel, editor, and Moreno Nieto, Daniel, editor

Published
2024
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6. CAD-Based Automated USV Hull Design

Author

Tzotzis, Anastasios, Efkolidis, Nikolaos, García-Hernández, César, Kyratsis, Panagiotis, Davim, J. Paulo, Series Editor, Guxho, Genti, editor, Kosova Spahiu, Tatjana, editor, Prifti, Valma, editor, Gjeta, Ardit, editor, Xhafka, Eralda, editor, and Sulejmani, Anis, editor

Published
2024
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12. Lagarto I-Una plataforma hardware/software de arquitectura de computadoras para la academia e investigaci\'on

Author

Lazo, Cristobal Ramirez, Hernandez, Cesar Alejandro, Morales, Carlos Rojas, Garcia, Gustavo Mondragon, Vargas, Luis Alfonso Villa, and Salinas, Marco Antonio Ramirez

Subjects
Computer Science - Hardware Architecture
Abstract

The design of Microprocessors Computer Architectures remains as a fundamental course in Computer Science and Computer Engineering. The technology and organization inside microprocessors have changed quite fast in the last twenty years. That change has increased the information handled in class, difficulting the teaching/learning process among students. Although there are tools, mainly simulators, available to exemplify abstract concepts during the course, these tools have not come along with the technology. The computer architecture group of the Centro de Investigaci\'on en Computaci\'on at the IPN Mexico is working on a project called Lagarto to create an open computing platform for research and education to simplify the understanding of fundamental concepts involved in computer architecture and operating systems. This paper introduces Lagarto, our soft-core-processor micro-architecture. It has a scalar pipeline structure and executes a full MIPS 32 R6 ISA [9] [10] and includes an MMU to support modern Operative Systems. The complete design has been described using Verilog HDL and is fully synthesizable in an FPGA. Additionally, this work shows different ways to use and test the microprocessor with codes written in either assembly language or C language. We show that the Lagarto project allows students to incorporate during the course not only the traditional model of visualizing theoretical knowledge in a practical exercise through simulators but also integrate into the teaching process the RTL design to build the Microprocessor Architecture., Comment: in Spanish. Research in Computing Science. https://www.rcs.cic.ipn.mx/2017_137/Lagarto%20I%20-%20Una%20plataforma%20hardware_software%20de%20arquitectura%20de%20computadoras%20para%20la%20academia.pdf

Published
2022

15. A RISC-V Simulator and Benchmark Suite for Designing and Evaluating Vector Architectures

Author

Lazo, Cristóbal Ramírez, Hernández, César Alejandro, Palomar, Oscar, Unsal, Osman Sabri, Ramírez, Marco Antonio, and Cristal, Adrían

Subjects
Computer Science - Hardware Architecture
Abstract

Vector architectures lack tools for research. Consider the gem5 simulator, which is possibly the leading platform for computer-system architecture research. Unfortunately, gem5 does not have an available distribution that includes a flexible and customizable vector architecture model. In consequence, researchers have to develop their own simulation platform to test their ideas, which consume much research time. However, once the base simulator platform is developed, another question is the following: Which applications should be tested to perform the experiments? The lack of Vectorized Benchmark Suites is another limitation. To face these problems, this work presents a set of tools for designing and evaluating vector architectures. First, the gem5 simulator was extended to support the execution of RISC-V Vector instructions by adding a parameterizable Vector Architecture model for designers to evaluate different approaches according to the target they pursue. Second, a novel Vectorized Benchmark Suite is presented: a collection composed of seven data-parallel applications from different domains that can be classified according to the modules that are stressed in the vector architecture. Finally, a study of the Vectorized Benchmark Suite executing on the gem5-based Vector Architecture model is highlighted. This suite is the first in its category that covers the different possible usage scenarios that may occur within different vector architecture designs such as embedded systems, mainly focused on short vectors, or High-Performance-Computing (HPC), usually designed for large vectors., Comment: ACM Transactions on Architecture and Code Optimization, Volume 17, Issue 4, December 2020, Article No.38

Published
2021
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26. Beyond the bladder: poor sleep in women with overactive bladder syndrome

Author

Savoie, Marissa B, Lee, Kathryn A, Subak, Leslee L, Hernandez, Cesar, Schembri, Michael, Fung, Constance H, Grady, Deborah, and Huang, Alison J

Subjects
Reproductive Medicine, Biomedical and Clinical Sciences, Sleep Research, Clinical Trials and Supportive Activities, Behavioral and Social Science, Clinical Research, Urologic Diseases, Actigraphy, Aged, Biofeedback, Psychology, Breathing Exercises, Female, Humans, Independent Living, Middle Aged, Nocturia, Sleep Wake Disorders, Urinary Bladder, Overactive, Urinary Incontinence, Urge, insomnia, nocturia, overactive bladder, relaxation exercises, sleep, slow-paced respiration, Paediatrics and Reproductive Medicine, Obstetrics & Reproductive Medicine, Reproductive medicine
Abstract

BackgroundNocturnal bladder symptoms and sleep disruption commonly coexist in middle-aged and older women. Although sleep disruption is often attributed to nocturnal bladder symptoms in women with overactive bladder syndrome, nonbladder factors also may influence sleep in this population. Many women with overactive bladder are eager to identify nonpharmacologic strategies for both bladder symptoms and sleep disruption, given the potential adverse effects of sedative and anticholinergic bladder medications in this population.ObjectivesTo provide greater insight into the complex relationship between nighttime overactive bladder symptoms and sleep disruption, and to evaluate the effects of a guided slow-paced respiration intervention on sleep outcomes in women with overactive bladder.Study designWe conducted an ancillary study within a randomized trial of slow-paced respiration in women with overactive bladder symptoms. Ambulatory community-dwelling women who reported ≥3 episodes/day of urgency-associated voiding or incontinence were randomized to use either a portable biofeedback device (RESPeRATE; Intercure, Ltd) to practice guided slow-paced respiration exercises daily for 12 weeks (N=79) or an identical-appearing device programmed to play nonrhythmic music without guiding breathing (N=82). At baseline and after 12 weeks, bladder symptoms were assessed by voiding diary, sleep duration, and disruption were assessed by sleep diary corroborated by wrist actigraphy, and poor sleep quality was determined by a Pittsburgh Sleep Quality Index global score >5.ResultsOf the 161 women randomized, 31% reported at least twice-nightly nocturia, 26% nocturnal incontinence, and 70% poor sleep quality at baseline. Of the 123 reporting any nighttime awakenings, 89% averaged 1 or more nighttime awakenings, and 83% attributed at least half of awakenings to using the bathroom. Self-reported wake time after sleep onset increased with increasing frequency of nocturnal bladder symptoms (P=.01 for linear trend). However, even among women without nocturia, average sleep quality was poor (Pittsburg Sleep Quality Index global score mean of 7.3; 95% confidence interval, 6.0-8.6). Over 12 weeks, women assigned to slow-paced respiration (N=79) experienced modest improvements in mean nocturnal voiding frequency (0.4 fewer voids/night), sleep quality (1.1 point score decrease), and sleep disruption (1.5% decreased wake time after sleep onset). However, similar improvements were detected in the music control group (N=81), without significant between-group differences.ConclusionsMany women with overactive bladder syndrome experience disrupted sleep, but not all nocturnal awakenings are attributable to bladder symptoms, and average sleep quality tends to be poor even in women without nocturia. Findings suggest that clinicians should not assume that poor sleep in women with overactive bladder syndrome is primarily caused by nocturnal bladder symptoms. Guided slow-paced respiration was associated with modest improvements in nocturia frequency and sleep quality in this trial, but the results do not support clinician recommendation to use this technique over other behavioral relaxation techniques for improving sleep.

Published
2020

28. Descent of a Suborbital Rocket: A Simulation Case Study Using CFD, Parametric Models and Neural Networks

Author

Díez-Arrizabalaga, Pablo, Hernández-Hernández, César, Santos, Matilde, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Sanjurjo González, Hugo, editor, Pastor López, Iker, editor, García Bringas, Pablo, editor, Quintián, Héctor, editor, and Corchado, Emilio, editor

Published
2022
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31. A Randomized Controlled Trial of Device Guided, Slow-Paced Respiration in Women with Overactive Bladder Syndrome.

Author

Huang, Alison J, Grady, Deborah, Mendes, Wendy B, Hernandez, Cesar, Schembri, Michael, and Subak, Leslee L

Subjects
Clinical Trials and Supportive Activities, Mind and Body, Urologic Diseases, Clinical Research, Renal and urogenital, Aged, Breathing Exercises, Female, Humans, Middle Aged, Relaxation, Respiratory Rate, Stress, Psychological, Treatment Outcome, Urinary Bladder, Overactive, Urination, urinary bladder, overactive, breathing exercises, relaxation therapy, stress, psychological, autonomic nervous system
Abstract

PurposeWe evaluated the effects of device guided, slow-paced respiration on urgency associated urinary symptoms, perceived stress and anxiety, and autonomic function in women with overactive bladder syndrome.Materials and methodsWe performed a randomized, parallel group trial of slow-paced respiration to improve perceived stress and autonomic dysfunction as potential contributors to overactive bladder. Ambulatory women who reported at least 3 voiding or incontinence episodes per day associated with moderate to severe urgency were randomized to use a portable biofeedback device to practice daily, slow, guided breathing exercises or a control device which appeared identical and was reprogrammed to play music without guiding breathing. During 12 weeks we evaluated changes in urinary symptoms by voiding diaries, perceived stress and anxiety by validated questionnaires, and autonomic function by heart rate variability and impedance cardiography.ResultsIn the 161 randomized participants, including 79 randomized to paced respiration and 82 randomized to the control group, the average ± SD baseline frequency of voiding or incontinence associated with moderate to severe urgency was 6.9 ± 3.4 episodes per day. Compared to controls the participants randomized to paced respiration demonstrated greater improvement in perceived stress (average Perceived Stress Scale score decrease 2.8 vs 1.1, p=0.03) but not in autonomic function markers. During 12 weeks the average frequency of voiding or incontinence associated with moderate to severe urgency, which was the study primary outcome, decreased by a mean of 0.9 ± 3.2 episodes per day but no significant between group difference was detected.ConclusionsAmong women with overactive bladder slow-paced respiration was associated with a modest improvement in perceived stress during 12 weeks. However, it was not superior to a music listening control for reducing urinary symptoms or changing autonomic function.

Published
2019

41. Digital Operative Guides for Helping First Responders in Public Buildings During Emergency Interventions

Author

Ruiz-Cartiel, Antonio, García-Hernández, César, Ubieto-Artur, Pedro, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, di Mare, Francesca, Series Editor, Roucoules, Lionel, editor, Paredes, Manuel, editor, Eynard, Benoit, editor, Morer Camo, Paz, editor, and Rizzi, Caterina, editor

Published
2021
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47. This Was Never Going to Fix the Border

Author

Hernandez, Cesar Cuauhtemoc Garcia

Subjects
Border patrols -- Compensation and benefits, Immigration policy -- Evaluation, Asylum, Right of -- Laws, regulations and rules, Border security -- Laws, regulations and rules -- Government finance, Deportation -- Laws, regulations and rules, Public contracts -- Forecasts and trends, Government regulation, Market trend/market analysis, Government contract, General interest, News, opinion and commentary
Abstract

On Sunday, lawmakers in Washington released the first major bipartisan bill to reform immigration policy in a decade. The Senate may vote on the proposal, a $118 billion plan that [...]

Published
2024

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