Kevin Hernández - Academia.edu (original) (raw)

Papers by Kevin Hernández

BMC Public Health (Web), 2017

Estudio de la dinámica epidemiológica de COVID-19 en El Salvador, a través de modelos determinist... more Estudio de la dinámica epidemiológica de COVID-19 en El Salvador, a través de modelos deterministas como SIR con tasa de mortalidad constante.

In this article we studied the epidemiological dynamics of COVID-19 in El Salvador, using determi... more In this article we studied the epidemiological dynamics of COVID-19 in El Salvador, using deterministic SIR-type mathematical models, and applying the Monte Carlo method, to establish and evaluate the critical phases of the pandemic and its effects.

This article studies the epidemiological dynamics of COVID-19 in El Salvador, using deterministic... more This article studies the epidemiological dynamics of COVID-19 in El Salvador, using deterministic models such as SIR, which is based on the Susceptible-Infected-Recovered scheme, with constant transmission and recovery rates, and introducing the parameter of the global mortality rate. The simulations of the SIR model were modified in order to consider the intervention in the social dynamics of the population, through measures such as social distancing, appropriate hygiene, and mandatory quarantine at the country level.

Computer Aided Systems Theory – EUROCAST 2017, 2018

The present paper introduces a new multi-objective variant of the Berth Allocation Problem in the... more The present paper introduces a new multi-objective variant of the Berth Allocation Problem in the context of maritime container terminals. Specifically, this optimization problem seeks to minimize the waiting times of the incoming container vessels to serve, the costs derived from the movement of containers around the terminal, and the time the containers are at the terminal. This optimization problem is solved by means of an Adaptive Large Neighborhood Search, which uses a dynamic parameter to destroy part of the solutions while a building method is designed to later rebuild them. The computational performance of this technique is assessed over a wide range of realistic scenarios. The results indicate its high efficiency and effectiveness, reporting high-quality solutions in all the cases within short computational times.

International Journal of Social Psychology, 2021

The objective of this study is to analyse the effect of perceived crowding and perceived restorat... more The objective of this study is to analyse the effect of perceived crowding and perceived restorative capacity on tourist satisfaction in different tourist environments. After visiting three tourist spaces, 1,958 tourists were surveyed. Three scales were used: (1) perceived restorative capacity of tourist environments; (2) perceived crowding; and (3) satisfaction, enjoyment and intention to recommend. The results showed that the perception of restorative capacity is intensely related to satisfaction measurements. In all three tourist spaces, satisfaction decreases as perceived restorative capacity drops. Likewise, the perception of crowding shows an inverse relationship with satisfaction; tourists who had a strong sense of being disturbed over the number of people at the site had lower levels of satisfaction, enjoyment and intention to recommend. The results show the important role played by perceived restorative capacity and the perception of crowding on tourist satisfaction and the...

The reduction of energy consumption in buildings is one of the goals to improve energy efficiency... more The reduction of energy consumption in buildings is one of the goals to improve energy efficiency. One way to achieve energy savings in buildings is to develop intelligent control strategies for heating systems that are able to reduce power consumption without affecting the thermal comfort. An intelligent control system must be able to predict the temperature of the building in order to manage the heating system. In this paper, we present a rule-based model that is able to predict the indoor temperature for different values of k (hours ahead in time). The model has been learned with FRULER, a genetic fuzzy system that generates accurate and simple knowledge bases. Our approach has been validated with real data from a residential college.

Dugesiana, 2021

The tribe Stenochiini Kirby, 1837 comprises six genera in North America with most species occurri... more The tribe Stenochiini Kirby, 1837 comprises six genera in North America with most species occurring in the tropical and temperateregions of the continent. Only two species in the genus Strongylium Kirby, 1818 have previously been reported from west of theContinental Divide in the United States from Arizona and New Mexico and no members of the tribe have been reported from the stateof Sonora, Mexico. We here report Strongylium tenuicolle (Say, 1826), known to be widely distributed east of the Rocky Mountains,from west of the Continental Divide for the first time from both Arizona and New Mexico. We similarly report the first records ofboth Strongylium apache Triplehorn and Spilman, 1973 and Strongylium atrum Champion, 1888 from Sonora. Oploptera chamelensis(Doyen, 1990) was previously known only from the type series from Jalisco, Mexico and is here reported from Sonora, which thereby extends the known range of this genus significantly. To promote consistency in generic recognition, w...

The recurrent use of databases with variables of the categorical type in different fields of scie... more The recurrent use of databases with variables of the categorical type in different fields of science. Demands new approaches when using cluster analysis techniques on this type of database. For this reason, in this article we compare the function kmeans() of Matlab with a function K-Means implemented by us, with the addition that it has integrated a measure of similarity that the function of Matlab does not have, the distance chi-square, both algorithms were tested in databases with quantitative and categorical variables. The experimental results showed a higher level of classification success in favor of the function implemented by us, explaining the correct functioning of the implemented algorithm and demonstrating that the chi-square distance is the measure of appropriate similarity for categorical type databases.

International Journal of Electrical and Computer Engineering, 2021

The development of analysis methods for categorical data begun in 90's decade, and it has bee... more The development of analysis methods for categorical data begun in 90's decade, and it has been booming in the last years. On the other hand, the performance of many of these methods depends on the used metric. Therefore, determining a dissimilarity measure for categorical data is one of the most attractive and recent challenges in data mining problems. However, several similarity/dissimilarity measures proposed in the literature have drawbacks due to high computational cost, or poor performance. For this reason, we propose a new distance metric for categorical data. We call it: Weighted pairing (W-P) based on feature space-structure, where the weights are understood like a degree of contribution of an attribute to the compact cluster structure. The performance of W-P metric was evaluated in the unsupervised learning framework in terms of cluster quality index. We test the W-P in six real categorical datasets downloaded from the public UCI repository, and we make a comparison wit...

PeerJ, 2020

The genus Isodacrys Sharp, 1911 is revised. Twenty species of the genus are recognized ranging fr... more The genus Isodacrys Sharp, 1911 is revised. Twenty species of the genus are recognized ranging from south United States of America, Mexico, Guatemala and Honduras of which eight are herein described as new. These species are Isodacrys antrum Cortés-Hernández, new species (Mexico: Tamaulipas, Chiapas; Guatemala: Baja Verapaz); Isodacrys carlae Cortés-Hernández, new species (Mexico: Coahuila, Hidalgo, Nuevo León, San Luis Potosí, Tamaulipas); Isodacrys confusum Cortés-Hernández, new species (Mexico: Tamaulipas); Isodacrys fasciatum Cortés-Hernández, new species (Mexico: Coahuila, Durango, Nuevo León); Isodacrys frontalis Cortés-Hernández, new species (Mexico: Oaxaca; Guatemala: Sacatepéquez, Guatemala); Isodacrys kuchii Cortés-Hernández, new species (Mexico: Puebla); Isodacrys obrienorum Cortés-Hernández, new species (Guatemala: Totonicapán, Jalapa, San Marcos); and Isodacrys okuiltontli Cortés Hernández, new species (Mexico: Oaxaca). Insights into the monophyly of Isodacrys and its p...

Nucleic Acids Research, 2018

RegulonDB, first published 20 years ago, is a comprehensive electronic resource about regulation ... more RegulonDB, first published 20 years ago, is a comprehensive electronic resource about regulation of transcription initiation of Escherichia coli K-12 with decades of knowledge from classic molecular biology experiments, and recently also from highthroughput genomic methodologies. We curated the literature to keep RegulonDB up to date, and initiated curation of ChIP and gSELEX experiments. We estimate that current knowledge describes between 10% and 30% of the expected total number of transcription factor-gene regulatory interactions in E. coli. RegulonDB provides datasets for interactions for which there is no evidence that they affect expression, as well as expression datasets. We developed a proof of concept pipeline to merge binding and expression evidence to identify regulatory interactions. These datasets can be visualized in the RegulonDB JBrowse. We developed the Microbial Conditions Ontology with a controlled vocabulary for the minimal properties to reproduce an experiment, which contributes to integrate data from high throughput and classic literature. At a higher level of integration, we report Genetic Sensory-Response Units for 200 transcription factors, including their regulation at the metabolic level, and include summaries for 70 of them. Finally, we summarize our research with Natural language processing strategies to enhance our biocuration work.

Medizinische Klinik, 1997

ZUSA MM EN F ASSU NG ~£1 Amiodaron 1st ein sehr wirksames An.tJamhyttmskum zur Unterdrfickung vcn... more ZUSA MM EN F ASSU NG ~£1 Amiodaron 1st ein sehr wirksames An.tJamhyttmskum zur Unterdrfickung vcntrJkul~rer und supraventrikuiSrer Tachyarrhythmien. Die wicb_d~Tte ut~er-w0nschte V;qrkun g ist die pt~Imonale .Toxizit~it. Die den pulmonalen Ver;inderungen zugrunde!iegenden molekularen Mechanismen sind nicht eindeutJg gektSrt. Die Lungenver~nderun gen kSnnen sich in verscbiedenen Fomnen pr;i-se~tJerem.beispielsweJse als interstitie]le Pneumor~itis, Pibrose oder organisierende Pneumonie, Die Inzidenz ist bei niedriger Erhaimng¢dosis (<-_" 300 rag/d) geringer. Es existieren keinc eindeutigen Pr~diktoren der pulmonalen Toxizidit. Die Diagnose der amiodaroninduzierten Lungenver~nderungen ist in der tkeget eine AbsschluBdiagnose. Die wichtig~e TherapiemaBnahme be-steh~: im Absetzen des Antiarrhythmikums. Bei schweren Verlaugformen oder Falls das Antiarrhy~hmikum unverzichtbar 1st. wird eine Therapm mit Gtukokorrikoiden durchgefiih~.

MILCOM 88, 21st Century Military Communications - What's Possible?'. Conference record. Military Communications Conference

Physical models of a meteor-burst-communication channel (METLINK) and a link simulator (METWAIT) ... more Physical models of a meteor-burst-communication channel (METLINK) and a link simulator (METWAIT) were developed. Validation was performed using data measured on an experimental link in Greenland. METLINK and METWAIT were used to determine the sensitivity of 1000-character message waiting times to antenna pattern, link power margin, and range. This analysis shows that the sensitivity of message waiting times to power

Patient Education and Counseling, 2012

Objectives-This study examines three integrative health centers to understand their (1) historica... more Objectives-This study examines three integrative health centers to understand their (1) historical development, organizational goals, and modalities, (2) the processes and challenges of integrating complementary and allopathic medicine, while encouraging staff collaboration, and (3) how each center becomes institutionalized within their community. Methods-We focus on three organizational case studies that reflect varying forms of integrative health care practices in three U.S. cities. Participant-observation and in-depth interviews with center directors were analyzed qualitatively. Results-Important patterns found within the three cases are (1) the critical role of visionary biomedical practitioners who bridge complementary and allopathic practices, (2) communicating integration internally through team interaction, and (3) communicating integration externally through spatial location, naming, and community outreach. Conclusion-IM centers continue to blaze new trails toward mainstream access and acceptance by gathering evidence for IM, encouraging team collaboration within organizational contexts, constructing organizational identity, and negotiating insurance reimbursements. Practice implications-IM is not the enactment of specific modalities, but rather a philosophy of healing. Though scheduling conflicts, skepticism, and insurance coverage may be obstacles toward IM, collaboration among specialists and with patients should be the ultimate goal.

Food, Culture and Society: An International Journal of Multidisciplinary Research, 2010

ABSTRACT : : We examine the importance of the maintenance and reinvention of tradition to the foo... more ABSTRACT : : We examine the importance of the maintenance and reinvention of tradition to the food choices described by Mexican-American focus group participants recruited from nutritional health settings in central Texas.The pressures experienced while coping with changes in ...

Parasitology

Within the family Adeleidae, Adelina spp. belong to a group of arthropod pathogens. These parasit... more Within the family Adeleidae, Adelina spp. belong to a group of arthropod pathogens. These parasites have been reported to have a wide geographic distribution, however, there are no reports of these protists in the Canary Islands, Spain. One of the peculiarities of the life cycle of Adelina spp. is the participation of a predator, because fecundation and sporulation occur inside the body cavity, and so necessitate destruction of the definitive host. The involvement therefore of a ‘dispersion host’, which eats the definitive host and spreads the oocysts through its faeces, is critical for the maintenance of certain Adelina spp. On the island of Gran Canaria, adeleid oocysts have been found in stool samples from four animals, three California kingsnakes (Lampropeltis californiae), and one feral cat. These animals were part of a larger coprological study of vertebrate parasites (117 snakes, 298 cats), where pseudoparasitic elements were also recorded. L. californiae and feral cats are i...

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Innovaciones docentes en tiempos de pandemia.

Advances in Alzheimer’s Disease

Exposures to fine particulate matter PM2.5 and ozone O3 are associated with Alzheimer’s disease (... more Exposures to fine particulate matter PM2.5 and ozone O3 are associated with Alzheimer’s disease (AD) risk. Mexico City residents have lifetime exposures to PM2.5 and O3 above annual USEPA standards and their brains contain high redox, combustion, and friction-derived magnetite nanoparticles. AD pathological changes with subcortical pre-tangle stages in infancy and cortical tau pre-tangles, NFT Stages I-II, and amyloid phases 1–2 are identified by the 2nd decade. Given their AD continuum, a reliable identification of cognitive impairment is of utmost importance. The Montreal Cognitive Assessment (MoCA) was administered to 517 urbanites, age 21.60 ± 5.88 years, with 13.69 ± 1.28 formal education years, in Mexican PM2.5 polluted cities. MoCA score was 23.92 ± 2.82, and 24.7% and 30.3% scored ≤24 and ≤22, respectively (MCI ≤ 24, AD ≤ 22). Cognitive deficits progressively targeted Visuospatial, Executive, Language, and Memory domains, body mass index (BMI) impacting total scores negative...

Perspectivas

La conmemoración del bicentenario de la independencia centroamericana conlleva reflexionar sobre ... more La conmemoración del bicentenario de la independencia centroamericana conlleva reflexionar sobre qué historia enseñar, tomando como puntos de análisis la historiografía independentista y las condiciones de la enseñanza-aprendizaje de esa historia. Este artículo expone algunas ideas acerca del estado de la historiografía hondureña en relación con este hecho histórico, visualizando posibles retos o líneas temáticas por potenciar. Además, se abordan los desafíos que enfrenta la enseñanza-aprendizaje de la historia, dados los constantes debates y aportes que la literatura e investigación especializada han producido de este tema. En tal sentido, se reconoce que los progresos sobre la enseñanza-aprendizaje de la historia están vinculados a la formación inicial y permanente de los docentes, hecho que posibilita un salto cualitativo en sus prácticas educativas; asimismo, las contribuciones teóricas que los historiadores realicen con base en estas temáticas que forman parte del currículo nac...