bluuebunny/crossref_metadata_2025 huggingface dataset:
Modelo de prospectiva aplicado al sector turismo en el sur del Departamento del Huila
Authors:   Universidad Surcolombiana, Puentes Caballero Carlos Francisco , Ramírez Bermeo Daniel Felipe ,   Universidad Surcolombiana, Perdomo Díaz Carlos Arturo ,   Universidad Surcolombiana
Published: June 2021

El turismo es uno de los ejes de la agenda integrada de competitividad más importante para el departamento del Huila, puesto que el reconocimiento hecho por la UNESCO en el año 2005 al Parque Arqueológico de San Agustín, se constituyó en un acto de apertura a la ventana de la productividad y el desarrollo turístico de la región. Desde estos escenarios, el propósito del presente artículo se ha centrado en analizar desde el modelo de prospectiva aplicada al sector turismo del departamento del Huila, el comportamiento del mismo, durante el periodo comprendido del 2016 a 2020, continuando de esta manera con los análisis de direccionamiento estratégico planteados a partir de la Agenda Integrada de competitividad, ciencia, tecnología e innovación del departamento, de cara al proceso de internacionalización de la economía regional. De esta manera, el presente artículo se formuló a partir de información y estadísticas aportadas por la Gobernación del Huila, Oficina de la productividad, Alcaldías (Pitalito, San Agustín, Acevedo, Suaza, Timaná entre otras), Universidad Surcolombiana y algunos entes institucionales que aportaron a la forma como se han desarrollado proyectos de innovación y solución de falencias descritas en la matriz DOFA y de las que surgieron estrategias de capacitación a grupos comunitarios de la región. La ruta metodológica se orienta en el tipo de investigación cuantitativa, teniendo en cuenta que se parte de una problemática de las regiones del sur del Huila que son biodiversas, pero no cuentan con estrategias que la impulse, por tal razón, desde la técnica de la encuesta, se realiza la Matriz DOFA y con sus resultados poder diseñar nuevas estrategias para posicionar la imagen del Huila y su turismo en la lista de los principales sitios turísticos de Colombia.
Incentivar el sentido socio-vital en la formación de la conciencia ética
Authors:   Universidad Santo Tomás de Colombia, Prada Valenzuela José de Jesús , Triana Domínguez Camilo ,   Universidad SantoTomás de Colombia, Parada Juan Alexis ,   Universidad Santo Tomás de Colombia, Rivera Andrés Felipe ,   Universidad Santo Tomás de Colombia, Muñoz Darwin Arturo ,   Universidad  Santo Tomás de Colombia
Published: June 2021

De acuerdo a la reflexión que se ha dado a partir de un ejercicio investigativo acerca de la construcción ética y todo lo que la puede determinar, es evidente la necesidad de replantear la manera en que los seres humanos han estado adecuando su entorno y la relación con el mismo, tanto así, que como uno de los resultados del ejercicio realizado, se evidencia que urge que el despliegue humano tenga la capacidad de lograr nuevas maneras de ser y de relacionarse, de habitar y de habitarse; se construya sobre la base de una consciencia con sentido socio-vital en la que los comportamientos personales se perciban interdependientes, donde cada individuo sea consciente de que es una pequeña pero incisiva parte de un único y mismo tejido global socio-vital en riesgo. Por lo anterior, este capítulo tiene como objetivo hacer hincapié en la construcción que debe hacerse de una ética con consciencia socio-vital. Para intentar cumplir con el objetivo propuesto los investigadores se valieron de un estudio de tipo documental, en un primer momento se abordaron, circunstancias del ser humano en la contemporaneidad; luego, el tópico «individualismo e ilógica egonómica»; en un tercer momento, el asunto «conciencia con sentido socio-vital»; y, finalmente, se disertó sobre el tema de «la lucidez».
Costos ocultos en organizaciones manufactureras. Una aproximación a su identificación, control y gestión
Authors:   Fundación Universitaria Compensar Sede Valle, Olarte Cabana Jairo Alberto , Salas Cruz Nicolás ,   Fundación Universitaria Compensar Sede Valle, Angulo Castillo Ana María ,   Fundación Universitaria Compensar Sede Valle, Guerrero Valencia Sandra Mayerlin ,   Fundación Universitaria Compensar Sede Valle
Published: June 2021

Imperceptibles, una de las características con mayor eco en el tipo de costos que se estudia en esta investigación, los costos ocultos. Muchas han sido las iniciativas por comprender las dinámicas organizacionales que dan paso a los disfuncionamientos o aquellas actividades que, derivadas de una decisión, en ocasiones no acertada y sacrificando un costo de oportunidad por la elección, generan imprevistos en el cumplimiento de los objetivos estratégicos y las expectativas de los grupos de interés. De manera especial, las organizaciones avocadas a la manufactura son focos en el estudio de los costos ocultos pues su gestión productiva facilita caldos de cultivo para su presencia, por ello, el propósito de este trabajo es estudiar la forma en que pueden ser identificados, controlados y gestionados los costos ocultos en organizaciones manufactureras. La investigación se enmarcó en los preceptos de la teoría socioeconómica, así, sus fundamentos delimitan un enfoque deductivo, con alcance descriptivo y revisión de fuentes documentales sistematizadas bajo técnicas como la operacionalización de categorías y el análisis de contenidos. Los hallazgos se consolidaron en matrices de triple entrada desagregadas en las subcategorías tratadas (identificación, control y gestión). En los resultados se observó que la metodología más utilizada para identificar costos ocultos es el diagnóstico socioeconómico; por su parte, las prácticas formales de control se adscriben a mecanismos físicos y coercitivos, teniendo menos participación el autocontrol, la responsabilidad y la autonomía (paradigma emergente). La gestión busca una perspectiva social (visión compartida) y económica (sostenibilidad) que, tras integrar la planeación y el diseño de acciones a la medida, permitan identificar, controlar y mitigar los impactos de los costos ocultos.
Análisis de recursos y actividades intangibles de capital relacional en grupos de investigación.
Authors:   Corporación Universitaria Minuto de Dios, Marulanda Grisales Natalia , Echeverry Correa Francisco Javier ,   Corporación Universitaria Minuto de Dios
Published: June 2021

La Gestión de Conocimiento (GC) en Instituciones de Educación Superior (IES) puede ser analizada a partir del Capital Intelectual (CI) presente en los grupos de investigación, el cual se encuentra conformado por recursos y actividades intangibles; convirtiéndose en un elemento valioso y diferenciador para las IES. El CI se expresa por medio del capital humano, estructural y relacional. Este último es el que guarda mayor afinidad con el establecimiento de relaciones de confianza en el largo plazo con los stakeholders de las IES. Así pues, el presente estudio pretende analizar la articulación entre recursos y actividades intangibles de capital relacional en grupos de investigación en IES. Para tal fin, se llevó a cabo un estudio estadístico multivariado a través de la técnica de Análisis de Componentes Principales, a partir de un enfoque cuantitativo e investigación correlacional. Entre los principales resultados se identificó que la inversión en actividades intangibles es el proceso central que fortalece los recursos intangibles de capital relacional. Asimismo, se destacan algunos activos intangibles que permiten mejorar el desempeño de grupos de investigación como calidad e identidad del docente, reconocimiento de grupos de investigación e imagen de la actividad investigativa.
Caracterización del sector microempresarial del Espinal Tolima, año 2020
Authors:   Instituto Tolimense de Formación Técnica Profesional ITFIP, Guzmán Robert Alexander , Palma Cardoso Elizabeth ,   Instituto Tolimense de Formación Técnica Profesional ITFIP, Díaz Pava Mario Fernando ,   Instituto Tolimense de Formación Técnica Profesional ITFIP, Varón Giraldo Orlando ,   Instituto Tolimense de Formación Técnica Profesional ITFIP, Morales Lugo Ruth Erika ,   Instituto Tolimense de Formación Técnica Profesional ITFIP
Published: June 2021

En Colombia el tejido empresarial representado por las empresas responsables de la dinámica económica, cumplen su labor de generar su aporte desde cada uno de su objeto económico, sin embargo, es relevante la participación e importancia que tienen las microempresas en cada una de las regiones del país. El presente capítulo describe las características del sector micro en el Espinal Tolima, a partir de la base de datos reportada por la Cámara de Comercio del Sur y Oriente del Tolima a junio de 2020, la cual se abordó desde un enfoque cualitativo realizándose un análisis descriptivo para identificar las diferentes variables proporcionadas en la base de datos como, la clasificación industrial internacional uniforme (CIIU) de las actividades económicas, tiempo de matrícula mercantil, fecha de renovación, tipo de organización, ubicación. Como principales resultados se encuentran que al cierre de Junio de 2020, se habían renovado la matrícula mercantil en un 43% de las micro registradas en cámara de comercio, y el 57% se registran con última fecha de renovación en el 2019. El 40% de las micro se encuentran ubicadas en el sector centro y un 76% desarrollan actividades de comercio al por menor, de igual forma el análisis de la base de datos determinó que de las microempresas inscritas a la fecha de estudio el 33% lleva más de 10 años ejerciendo su actividad comercial desde su registro mercantil. Se llegó a la conclusión que este tipo de empresas tienen la ventaja de adaptarse de una manera más rápida a los cambios que le presente el entorno.
Reactivación de empresas de alojamiento después de la COVID-19, en ámbitos rurales
Authors:   Universidad Autónoma del Carmen, Cano Alamilla Azeneth , González Ascencio Ruby Asunción ,   Universidad Autónoma del Carmen, Torres Tello Giovanna Patricia ,   Universidad Autónoma del Carmen, Pérez Fernández Alberto ,   Universidad Autónoma del Carmen, Córdova Zacarías Martha Estela ,   Universidad Autónoma del Carmen
Published: June 2021

La restricción de la actividad turística, ante la pandemia COVID-19, ha generado un impacto económico, en las empresas del sector turístico, las cuales, a pesar de lo restringido de sus recursos, tendrán que reactivarse buscando un equilibrio entre los precios de los servicios y la nueva capacidad de los establecimientos y espacios, por tanto el objetivo de esta investigación es, identificar las condiciones y oportunidades de desarrollo para empresas de alojamiento en ámbitos rurales, ante la reactivación del mercado turístico interno y de la economía considerando los efectos de la COVID-19. El turismo rural comunitario, es una experiencia turística diferente, bajo el enfoque de desarrollo sustentable en una comunidad, las MiPyMES locales, creadas para el crecimiento de este tipo de turismo, deberán garantizar la conservación y uso moderado de los recursos, fortaleciendo la identidad local. Con base en un proyecto de investigación concluido denominado “Mejoramiento de la calidad de servicios de hoteles de dos y tres estrellas en Ciudad del Carmen, Campeche: bajo la percepción del consumidor”, cuyo objetivo consistió en el mejoramiento de la calidad de los servicios de los hoteles de dos y tres estrellas en las ciudades de San Francisco de Campeche y Ciudad del Carmen, Campeche; mediante la aplicación del modelo SERVQUAL (Service Quality). De la aplicación del modelo SERVQUAL, a la empresa Hotel Cedros de Uayamón, se obtuvo como resultado que el hotel, genera un servicio de calidad, siendo necesario fortalecer la limpieza de sus instalaciones, manteniendo las habitaciones confortables y acogedoras. De esta manera, se considera que ante el panorama que pudiera surgir con la reactivación del turismo interno, en las comunidades rurales del estado de Campeche; las empresas comprometidas con la calidad del servicio tendrán mayores oportunidades para fortalecer los empleos, fomentando protocolos de salud, y siendo más competitivas.
Simulación de balanceo de línea con PROMODEL®
Authors:   Universidad Autónoma de Ciudad Juárez, Magallan Morales Adrian Andres , Pérez-Domínguez Luis ,   Universidad Autónoma de Ciudad Juárez, Sánchez-Mojica Karla Yohana ,   Fundación de Estudios Superiores Comfanorte FESC, Luviano Cruz David ,   Universidad Autónoma de Ciudad Juárez
Published: June 2021

Dentro de una empresa, es importarte que la carga de trabajo en cada una de las estaciones de trabajo sea la adecuada. Pues gracias a esto se evitan situaciones, como lo es un cuello de botella, que es un problema muy común dentro de los procesos de elaboración de cualquier producto. Por este motivo, la herramienta del balanceo de líneas es indispensable para la solución de dicho problema. En este artículo el principal objetivo es realizar una comparación de los resultados obtenidos por el caso resuelto por miembros de la Universidad de Malaysia, en el cual se estudió una línea de ensamble de convertidores de potencia, utilizando como dato principal las unidades de tiempo de 27 actividades que conforman un total de 19 estaciones de trabajo para la elaboración de este producto. De este modo, se pretende valorar a través de aplicaciones de simulación Promodel®. A la par, el tipo de investigación que se emplea en este proyecto es experimental. Para la resolución de este caso, se utilizó la teoría básica respecto al tema de balanceo de líneas, la cual consiste en equilibrar los tiempos con respecto al tiempo tipo que se desea que posean cada una de las actividades para el requerimiento promedio de unidades que desea la empresa. Y para concluir dicho experimento, se hará uso de una simulación tanto del proceso original y la propuesta de mejora, con el fin de realizar una comparativa de los resultados obtenidos por el reajuste de tiempos para eliminar los cuellos de botella presentes en el proceso de producción.
Enraizamiento de Myrciaria dubia (HBK Mc Vaugh) Clon E3-F7 con diferentes concentraciones de ácido indolbutírico
Authors: BRAGA VÁSQUEZ SONIA MILAGROS , VELAZCO CASTRO ENA VILMA , ABANTO RODRÍGUEZ CARLOS , CASTRO MUÑOZ CINDY PAOLA
Published: June 2021

El objetivo de evaluar el enraizamiento de estacas de tallo de Myrciaria dubia (HBK Mc Vaugh) Clon E3-F7 con diferentes concentraciones de ácido indolbutírico. Se seleccionaron plantas madres de 12 años, del caserío San Juan-Yarinacocha, donde se obtuvieron estacas de tallo de la parte media de la planta, con 15 cm de longitud, teniendo dos pares de hojas al 50% de área foliar. El Diseño Completamente al Azar (DCA) con cinco tratamientos (T1=0, T2=150, T3=300, T4=450, T5=600 mg L-1 de AIB) y tres repeticiones, con 15 unidades experimentales; cada unidad de 24 estacas, haciendo un total de 360 estacas de tallo. Variables: número de callos, número de raíces y longitud de raíz (cm) evaluándose cada 15 días. El análisis de variancia (p? 0,05) significativo. La prueba de promedio de Tukey (p? 0,05), mostró que el mejor tratamiento en número de callos fue el T1=0 mg L-1 AIB (37, 55 callos), número de raíces el T5 = 600 mg L-1 AIB (3, 11 raíces) y para la longitud de raíces el T4=450 mg L-1 AIB (6, 21 cm). Por consiguiente, las estacas de tallos de Myrciaria dubia (HBK Mc Vaugh) Clon E3-F7, necesitan ser estimulados con hormonas de crecimiento para enraizar.
COMPARAÇÃO DO TEOR DE IVERMECTINA INDUSTRIALIZADOS E MANIPULADOS POR ESPECTROFOTOMETRIA DE ABSORÇÃO
Authors: Figueiredo Jasmine Garcia de , Estrela Maria Amélia Albergaria
Published: June 2021

A ivermectina é um potente antiparasitário que, por já possuir atividade contra uma ampla quantidade de vírus, teve destaque no ano de 2020 como um medicamento com potencial eficácia para o tratamento da Covid-2019. O trabalho publicado por Caly (2020) alavancou o uso off-label de ivermectina pela população por mostrar o resultado do medicamento de um teste feito com células in vitro infectadas com o vírus SARS-CoV-2 isolado. O presente trabalho teve por objetivo quantificar o teor de ivermectina em medicamentos manipulados e industrializados, comparando os resultados com o valor indicado no rótulo. Por não possuir um método já pré-estabelecido pela Farmacopeia Brasileira, o doseamento foi feito segundo a metodologia adaptada de Costa e Pereira Netto (2019), utilizando o método de espectrofotometria no UV/VIS, que é preconizado pela Agência Reguladora para quantificação de substâncias. Os resultados demonstraram que quatro das seis amostras analisadas não estavam dentro dos parâmetros exigidos pela agência reguladora americana em relação ao teor de princípio ativo. Pretende-se destacar a importância do controle de qualidade dos medicamentos, além de alertar dos possíveis riscos à saúde associados à administração de medicamentos cuja indicação diverge do que consta na bula.
PROJETO E CONSTRUÇÃO DE UM CONVERSOR DO TIPO BUCK E ANÁLISE DE DADOS EM RELAÇÃO A UM MODELO EM CONDIÇÕES IDEAIS
Authors: Ribeiro de Paiva Miguel Victor , Amaral Melo Lima Thiago
Published: June 2021

O presente artigo objetivou a elaboração do projeto de um conversor tipo buck, bem como a execução de testes e a análise de dados e/ou sinais em relação a um modelo de conversor em condições ideais. A construção do protótipo foi feita utilizando dispositivos reaproveitados de sucata, porém em bom estado, e de alguns poucos materiais comprados com recursos próprios. Para análise de dados foram utilizados equipamentos com alto grau de confiabilidade, como osciloscópio e fonte reguladora de tensão, além de se utilizar um software de projetos eletrônicos conhecido como PSIM, de grande precisão e bastante utilizado na Engenharia. Quanto à revisão bibliográfica,  apoiamos nosso estudo em autores com rico conhecimento na área de Eletrônica de Potência, tais como HART (2011), AHMED (2000) e BOYLESTAD-NASHELSKY (1999), onde além de identificar os conhecimentos técnicos úteis para a realização desta pesquisa, foi observado a grande importância desta área do conhecimento em vários setores do meio tecnológico, como também a importância dos conversores dentro da Eletrônica de Potência desde a produção de energia até o seu consumo final. Assim, este artigo visa demonstrar não apenas como é possível executar um projeto de conversor, mas também demonstrar a importância do assunto dentro da área de engenharia e de suas aplicações reais dentro do contexto tecnológico que vivenciamos. Com os resultados obtidos, pode-se concluir que o projeto obteve êxito, apesar de ser executado manualmente e com utilização de materiais reaproveitados.
O JOGO DE XADREZ E A EDUCAÇÃO MATEMÁTICA: LIMITES E POSSIBILIDADES
Authors: Amaral Melo Lima Thiago , Dos Santos Oliveira Erimar , De Oliveira Silva Marcones , Oliveira da Silva Pétrick
Published: June 2021

No presente artigo usamos o jogo de Xadrez para responder o seguinte questionamento: como esse instrumento milenar pode subsidiar na aprendizagem da disciplina de Matemática dos alunos do Ensino Médio? Para uma maior compreensão do Ensino de Matemática e da utilização de jogos educativos, realizamos inicialmente uma pesquisa documental analisando as propostas contidas nos Parâmetros Curriculares Nacionais (PCN’s) e, em um segundo momento, uma pesquisa bibliográfica, tomando por base teóricos tais como Kishimoto e Piaget.  Nosso objetivo é discutir a relação do Xadrez com a Matemática, bem como as semelhanças que podemos observar entre matemáticos e enxadristas. Para tanto, apresentamos exemplos de aplicação, para demonstrar uma alternativa de abordagem de alguns conteúdos matemáticos que podem usar o xadrez como importante ferramenta. Por fim, concluímos que o Xadrez é uma excelente opção como recurso na aprendizagem, em especial na aprendizagem Matemática.
An Effective Combination of Textures and Wavelet Features for Facial Expression Recognition
Authors: Hassan S. M. , Alghamdi A. , Hafeez A. , Hamdi M. , Hussain I. , Alrizq M.
Published: June 2021

In order to explore the accompanying examination goals for facial expression recognition, a proper combination of classification and adequate feature extraction is necessary. If inadequate features are used, even the best classifier could fail to achieve accurate recognition. In this paper, a new fusion technique for human facial expression recognition is used to accurately recognize human facial expressions. A combination of Discrete Wavelet Features (DWT), Local Binary Pattern (LBP), and Histogram of Gradients (HoG) feature extraction techniques was used to investigate six human emotions. K-Nearest Neighbors (KNN), Decision Tree (DT), Multi-Layer Perceptron (MLP), and Random Forest (RF) were chosen for classification. These algorithms were implemented and tested on the Static Facial Expression in Wild (SWEW) dataset which consists of facial expressions of high accuracy. The proposed algorithm exhibited 87% accuracy which is higher than the accuracy of the individual algorithms.
Implementation of Lean Manufacturing in a Cement Industry
Authors: Masmali M.
Published: June 2021

The lean manufacturing concept is a systematic minimization of waste and non-value activities in production processes introduced by the Toyota production system. In this research, lean manufacturing is implemented in a cement production line. Value Stream Mapping (VSM) is applied to give a clear picture of the value chain in cement production processes and to highlight the non-value-added in the shop floor. To begin, the existing VSM is constructed based on the information and data gathered during visiting and observing the manufacturing process in the firm. As a result, the excess inventory between workstations was identified as a major waste generation, hence, the proposed VSM conducts further improvement and makes action plans to alleviate the unwanted activities. Then, the takt time to ensure smooth material flow and to avoid any occurring delay or bottleneck in the production line was figured out. The supermarket pull-based production control is suggested to be adopted in the future map. Two pull production strategies are selected in this case. The first is applying the Kanban system to control the level of inventory between workstations. The other is the CONWIP approach to control the amount of work in process to the entire production line. The outcome of the proposed models indicates a decrease of the none-value time from 23 days in the current state to about 4 and 2 days in Kanban and CONWIP systems respectively, so the CONWIP was suggested as most efficient. Some suggestions for further research are also mentioned.
Evaluation of the Variation in Dynamic Load Factor Throughout a Highly Skewed Steel I-Girder Bridge
Authors: Almoosi Y. , McConnell J. , Oukaili N.
Published: June 2021

The Dynamic Load Factor (DLF) is defined as the ratio between the maximum dynamic and static responses in terms of stress, strain, deflection, reaction, etc. DLF adopted by different design codes is based on parameters such as bridge span length, traffic load models, and bridge natural frequency. During the last decades, a lot of researches have been made to study the DLF of simply supported bridges due to vehicle loading. On the other hand, fewer works have been reported on continuous bridges especially with skew supports. This paper focuses on the investigation of the DLF for a highly skewed steel I-girder bridge, namely the US13 Bridge in Delaware State, USA. Field testing under various load passes of a weighed load vehicle was used to validate full-scale three-dimensional finite element models and to evaluate the dynamic response of the bridge more thoroughly. The results are presented as a function of the static and dynamic tensile and compressive stresses and are compared to DLF code provisions. The result shows that most codes of practice are conservative in the regions of the girder that would govern the flexural design. However, the DLF sometimes exceeds the code-recommended values in the vicinity of skewed supports. The discrepancy of the DLF determined based on the stress analysis of the present study, exceeds by 13% and 16% the values determined according to AASHTO (2002) for tension and compression stresses respectively, while, in comparison to BS5400, the differences reach 6% and 8% respectively.
An End-to-End Machine Learning based Unified Architecture for Non-Intrusive Load Monitoring
Authors: Wali S. , Haq M. H. U. , Kazmi M. , Qazi S. A.
Published: June 2021

Non-Intrusive Load Monitoring (NILM) or load disaggregation aims to analyze power consumption by decomposing the energy measured at the aggregate level into constituent appliances level. The conventional load disaggregation framework consists of signal processing and machine learning-based pipelined architectures, respectively for explicit feature extraction and decision making. Manual feature selection in such load disaggregation frameworks leads to biased decisions that eventually reduce system performance. This paper presents an efficient End-to-End (E2E) approach-based unified architecture using Gated Recurrent Units (GRU) for NILM. The proposed approach eliminates explicit feature engineering and has a unified classification and prediction model for appliance power. This eventually reduces the computational cost and enhances response time. The performance of the proposed system is compared with conventional algorithms' with the use of recall, precision, accuracy, F1 score, the relative error in total energy and Mean Absolute Error (MAE). These evaluation metrics are calculated on the power consumption of top priority appliances of Reference Energy Disaggregation Dataset (REDD). The proposed architecture with an overall accuracy of 91.2 and MAE of 25.23 outperforms conventional methods for all electrical appliances. It has been showcased through a series of experiments that feature extraction and event-based approaches for NILM can readily be replaced with E2E deep learning techniques allowing simpler and cost-efficient implementation pathways.
The Influence of Fly Ash on the Compressive Strength of Recycled Concrete Utilizing Coarse Aggregates from Demolition Works
Authors: Phan V. T. , Nguyen T. H.
Published: June 2021

The compressive strength of recycled concrete with coarse aggregates with and without fly ash was studied in this paper. The recycled concrete was designed to have a compressive strength of Rn=15Mpa. The ratio of conventional aggregates and recycled coarse aggregates was 50-50. Fifteen samples for each recycled concrete aggregate had been cast and were tested 7, 14, and 28 days after curing. The experimental results indicate that the strength development of the two recycled concrete mixes is relatively uniform. Fly ash increased the compressive strength of recycled concrete by 11% for 7-day aged samples. The recycled concrete with fly ash had 7% less compressive strength than the concrete consisting of natural aggregates.
The Effect of Moisture and Fine Grain Content on the Resilient Modulus of Sandy Clay Embankment Roadbed
Authors: Tuan N. A. , Chieu P. Q.
Published: June 2021

This paper studies the effect of moisture and fine grain content on the resilient modulus of sandy clay embankment roadbed in the Mekong Delta, Vietnam. The study analyzed the grain content of 30 soil samples on the annually flooded routes of the Mekong Delta according to the AASHTO T88-97 standard. The triaxial compression test at room temperature was used to estimate the resilient modulus of the samples belonging to 6 moisture levels. The experiments were conducted using 3 levels of lateral pressure, 0, 21, and 41kPa. Five deflection stress tests of 14, 28, 41, 55, and 69kPa, were conducted for each lateral pressure. The results showed that as the percentage of grains finer than 0.075mm increased, the variation ratio of the resilient modulus also increased. The content of grains finer than 0.075mm was between 54.1%-93%, while the variation ratio of the resilient modulus ranged between 53.7% and 89.1%. Moreover, as the percentage of grains finer than 0.075mm increased, water absorption capacity increased and resilient modulus decreased. As moisture and fine grain content influence the resilient modulus of the roadbed, this study’s results will help to limit and prevent the erosion of sandy clay embanked roadbeds, especially on frequently flooded areas such as the Mekong Delta.
Modified Numerical Modeling of Axially Loaded Concrete-Filled Steel Circular-Tube Columns
Authors: Nguyen P. C. , Pham D. D. , Tran T. T. , Nghia-Nguyen T.
Published: June 2021

Predicting the behavior of concrete in a Concrete-Filled Steel Tubular (CFST) column is challenging due to the sensitivity to input parameters such as the size of the cross-section, the material modeling, and the boundary conditions. The present paper proposes a new modified finite element model to predict the behavior and strength of a CFST subjected to axial compression. The development is based on the concrete damaged plasticity model, with its stress-strain relationship revised from the available model. The predicted accuracy of the modified model is verified via a wide range of experimental tests. The proposed model has more accuracy than the available models in predicting the ultimate compression strength. The results show good agreement with the test data, allowing its use in modeling CFST columns.
Study of the Compressive Strength of Concrete with Partial Replacement of Recycled Coarse Aggregates
Authors: Vu X. H. , Vo T. C. , Phan V. T.
Published: June 2021

This paper presents a study on the compressive strength of concrete using recycled aggregates. The concrete was designed to have a 25MPa compressive strength and an 8cm slump. The rates of replacing natural aggregates with recycled coarse were 0%, 10%, and 20%. The test samples were compressed to determine their compressive strength value after 7, 14, and 28 days of curing. The results showed that the concrete slump did not change effectively at a 10% replacement rate. When using 20% recycled aggregates, the concrete was too hard and the homogeneity of the concrete mixture could not be guaranteed. The compressive strength slightly decreased using 10% of recycled aggregates and decreased significantly using 20%. Therefore, 20% of recycled aggregate replacement is not suitable. The results showed that using recycled aggregates at a rate of 10% is optimal.
Electromagnetic Torque Analysis of SRM 12/8 by Rotor/Stator Pole Angle
Authors: Minh D. B. , Hai L. D. , Anh T. L. , Quoc V. D.
Published: June 2021

This paper presents the harmonic torque reduction by the different rotor pole angles of a three-phase 12/8 switched reluctance motor via an analytical model and simulation method. Improving torque performance by stator and rotor angles was applied for three-phase switched reluctance motor at stator pole/rotor pole ratios of 6/4, 8/12, 18/12, and 24/18. The average torque and the torque ripple effect by stator and rotor pole embrace have been recently studied in many projects. Due to the fact that leakage flux, flux density, and inductance are affected by the stator and rotor pole angles non-linear and linear leakage flux curves occur. Many stator and rotor pole angle combinations for the three-phase switched reluctance motor have already been done via a finite element method. In this paper, turn-on and turn-off angles will be figured based on stator and rotor pole embraces.
Study and Order of a Medium Power Wind Turbine Conversion Chain Connected to Medium Voltage Grid
Authors: Guediri Α. , Guediri Α.
Published: June 2021

In this article, we will study a system consisting of a wind turbine operating at a variable wind speed and a two-feed asynchronous machine (DFIG) connected to the grid by the stator and fed by a transducer at the rotor side. The conductors are separately controlled for active and reactive power flow between the stator (DFIG) and the network, which is achieved using conventional PI and fuzzy logic. The proposed controllers generate reference voltages for the rotor to ensure that the active and reactive powers reach the required reference values, in order to ensure effective tracking of the optimum operating point and to obtain the maximum electrical power output. System modeling and simulation were examined with Matlab. Dynamic analysis of the system is performed under variable wind speed. This analysis is based on active and reactive energy control. The results obtained show the advantages of the proposed intelligent control unit.
Attack Detection in IoT using Machine Learning
Authors: Anwer M. , Khan S. M. , Farooq M. U. , Waseemullah .
Published: June 2021

Many researchers have examined the risks imposed by the Internet of Things (IoT) devices on big companies and smart towns. Due to the high adoption of IoT, their character, inherent mobility, and standardization limitations, smart mechanisms, capable of automatically detecting suspicious movement on IoT devices connected to the local networks are needed. With the increase of IoT devices connected through internet, the capacity of web traffic increased. Due to this change, attack detection through common methods and old data processing techniques is now obsolete. Detection of attacks in IoT and detecting malicious traffic in the early stages is a very challenging problem due to the increase in the size of network traffic. In this paper, a framework is recommended for the detection of malicious network traffic. The framework uses three popular classification-based malicious network traffic detection methods, namely Support Vector Machine (SVM), Gradient Boosted Decision Trees (GBDT), and Random Forest (RF), with RF supervised machine learning algorithm achieving far better accuracy (85.34%). The dataset NSL KDD was used in the recommended framework and the performances in terms of training, predicting time, specificity, and accuracy were compared.
Erratum and Addendum: “Contractor’s Attitude towards Risk and Risk Management in Construction in Two Western Provinces of Vietnam”
Authors: Phan V. T.
Published: June 2021

Since the publication of our original paper in vol. 10, no. 6 of this journal [1], the author has detected several misprints and errors that are correct here, in the order in which they appear in the original paper.
EDUCATION OF 5TH–8TH FORM SCHOOL LEARNERS IN THE FIELD OF HEALTH PROMOTION
Authors: Česnavičienė Jūratė , Gudžinskienė Vida
Published: June 2021

The aim of this work was to investigate peculiarities of the life style of younger teenagers, main factors influencing their life style, and integration of the content of health promotion into educational system. This paper deals with education of 5th–8th form school learners in the field of health promotion. The analysis of health promotion in lessons of different subjects taught in secondary schools is presented. The research was conducted in 2003–2006 in various secondary schools all over Lithuania. The method of anonymous questionnaire was applied. The research involved school learners of 5th, 6th, 7th and 8th forms: 545 boys and 731 girls. The total sample of school learners involved in the research was 1276.
According to the opinion of teenagers, their life style is mostly influenced by the life style of their parents and family. The biggest attention to the health promotion is paid during lessons of natural sciences, physical culture and technologies. Most frequently school learners study problems of healthy nourishment, communication and interaction, drug and smoking prevention. More than a third of the respondents indicated absence of issues related to the mental health, stress management, sexual compulsion and tooth care. More than half of the school learners indicated lack of discussions related with prevention of heart diseases, cancer, and allergies. Most frequently, health promotion–related problems are integrated into all disciplines thought at school. Applying this model, teachers of all subjects are responsible for implementation of the programme and school learners can promptly get answers to relevant questions. However, the main imperfection of this method is difficulties in co-ordination of the programme implementation. There frequently occur cases when the same topic (e.g., healthy nourishment) is analysed during the lessons of several subjects (e. g., biology, technology, foreign language), whereas some important problems, requiring special knowledge of a teacher (e. g., stress management, sexual education) are usually neglected.
Successful implementation of the health promotion programme can be achieved employing an integrated educational model and a specially appointed person can administer co-ordination of teachers of different study subjects.
Keywords: 5th–8th form school learners, health education, health competency.
„COMPUTER ECOLOGY“ – KNOW-HOW FOR CLASS PROJECT
Authors: Bílek Martin , Opatrný Pavel , Turčáni Milan
Published: June 2021

The increased consumption and the using of Information and Communication Technologies (ICT) are leading to dynamical applications as well as to increased problems with ICT-waste. A big amount of valuable material is disappearing at the dumps. How are knowledge of students and teachers in the mentioned area – it is the content of school curriculum or it is necessary to add this topic into the school curriculum? Do students have any knowledge about materials on the electronic devices and how much costs their recycling? Some answers gives questionnaire “What with old computers?” distributed to students of teaching. By results we propose some activities, classes or class projects, for primary and secondary science education oriented to integration of science subjects (experimental activities, data mining and evaluation, calculations, geographical aspects, work with foreign texts, etc.).
Key words: class project, “Computer Ecology”, science education, electronic waste, opinions of students.
MULTIMEDIA AS A COMPONENT/ELEMENT OF A CHEMISTRY COURSEBOOK
Authors: Gulinska Hanna
Published: June 2021

The key to teach effectively and efficiently is to combine various elements of representation and visualization, work interactively and make connections between the learner’s emotions, images and sensations. A good example of how these principles are applied to teaching is a Polish chemistry coursebook Ciekawa Chemia (The Absorbing Chemistry). The coursebook includes a set of CDs which contain multimedia lessons supported with animations, simulations of processes and chemical phenomena, dynamic and three-dimensional models of elements and compounds, tests and tasks aimed at solving problems as well as film sequences presenting for instance chemical experiments. Thanks to these films, the learner can see particular elements of a given experiment in detail, analyse interrelations between them and memorize how the experiment is carried out as the films can be played repeatedly. Such a way of presenting chemical experiments can help both those teachers and learners who, for various reasons, cannot carry out certain experiments themselves, as well as those seeking inspiration for carrying out new experiments, and most of all those looking for proper didactic tools to explain difficult questions. It seems worth mentioning that the experiments presented on the CDs can be carried out safely and economically. Their visualizations allow to create images of experiments in the learner’s mind which, though cannot replace carrying out experiments in reality but may well constitute a valuable educational tool.
Key words: chemistry, didactics, experiment, multimedia.
COMPLEX PROBLEMS OF THE SCHOOL CHEMISTRY COURSE: OXIDATIVE QUALITIES OF HYDROGEN NITRATE
Authors: Krasitski Vasilij
Published: June 2021

The theme “Hydrogen nitrate interaction with metals” is one of the most difficult due to the school Chemistry course. The schoolboy main problem concerns the selection of the most probable reaction products. This complex problem is described in the pupil-books superficially, due to the level of the simple law learning. The detailed and systematized material in fact on this theme and the reaction mechanism are considered in this article. The general law of the hydrogen nitrate reduction by metals is formulated on this base, and the tables to determinate the most probable products of these processes are represented. This article is very useful for pupils and students, and for lectures and young people, it may be used to systematize knowledge due to this theme during the deep Chemistry studying process and to prepare for the examinations.
Key words: Hydrogen nitrate, oxidative qualities, reduction products, reaction mechanism.
Virtual Teaching Board Using Computer Vision
Authors: Sonkar Dr. S. K. , Aher Gouri , Anerao Nikita , Gavhale Shivam , Kadlag Aditya
Published: June 2021

In the software industry many whiteboard software are available. Each of them has its own pros and cons. One of the main disadvantages of these whiteboard software is the need of accurate pointing devices. Here we introduce the Smart virtual Board, which is a hand movements based writing software. It uses the hand movements for writing. User doesn’t need an external hardware pointing device to draw. Instead the different hand movements of the fingertips are used for writing purposes. We designed this system as a primary level software product. The software can be further upgraded by improving the current features. The disadvantage of the traditional writing software is that they use traditional writing devices like mouse light, pens etc. Now it overcomes by Computer vision technology. The next evolutionary technology that will take over the world will be the hand movement technology. By using hand movements for communicating with system.
Android Based Security Lock for Bike Ignition
Authors: Wagh Shrikar , Tambe Shilpa , Giri Mayuri , More Prof. Prajakta
Published: June 2021

Many times we forgot to carry the key of our bike or key gets lost in these case it is really difficult to get the bike started .this project is designed to solve this purpose . Concept behind this project is of relay operating using password entered through android mobile. It also turns on buzzer when wrong password is entered.
The headache and adverse events due to the use of personal protective equipment to combat Covid-19
Authors: Santos Erlene Roberta Ribeiro dos
Published: June 2021

Personal protective equipment such as a mask, face shield, and glasses for healthcare professionals has never been more widespread during is the occurrence of the Covid-19 pandemic. These devices compress the scalp tissue circumferentially and often leave pressure marks after its removal, as is often observed in the case of the mask. This situation has affected the work environment of professionals who have been at the forefront of combating Covid-19 since December 2019, in units dedicated to the care of infected patients. Therefore, we wonder about the need and importance of exploring the adverse event of prolonged use of personal protective equipment such as mask, face shield, and goggles associated with the triggering of external pressure headaches. The etiology of this type of headache is triggered by external pressure resulting from the sustained compression of the soft tissues of the epicrania, associated with the use of the equipment on the head, which can lead to work disability. For those who already suffer from primary headaches such as migraines, the damage can be greater, as the continued use of the accessory by pressing on sensitive areas for an extended period can increase the chance of triggering a crisis. Based on these notes, it is recommended that greater attention be paid to the care with the improvement of protective equipment as an object of study, in the search for alternatives that can minimize the damage caused.
Pseudotumor cerebri secondary to secondary hypoparathyroidism and association to Fahr´s Syndrome: a case report
Authors: Sampaio Patrick Giordanni Gomes , Maracajá Hiago Diniz , Batista Francielle Lopes de Araújo , Figueiredo Virgínia Gabriela Nóbrega , Melo Nátalia Meg Adijuto de
Published: June 2021

Introduction

Headaches are extremely common complications in emergency departments, accounting for up to 16% of visits, according to some studies and are observed in almost all patients with Idiopathic Intracranial Hypertension (IIH), which is characterized by signs and symptoms that include, in addition to headache, nausea, vomiting, diplopia, decreased visual acuity, pulsatile tinnitus, back and neck pain, among other possible manifestations. However, the clinical presentation is highly variable, which can delay diagnosis.

Case report

A.T.F, female, 33 years old, BMI 40.17 kg / m², with grade 3 obesity, caucasian, single, with Down Syndrome. Presents a history of post-surgical hypothyroidism, whose thyroidectomy was performed 10 years ago, due to nodular goiter. This patient presented subacute nausea, visual turbidity, diarrhea and pulsatile holocranial headache, which worsened in the horizontal position and presented slight relief in the orthostatic position.

Conclusion

The conduct of Fahrs Syndrome, in this case, was focused on the treatment of hypoparathyroidism and which consists of correcting metabolism disorders of phosphorus and calcium, which naturally resulted in clinical and radiological improvement, however, without definitive resolution of the condition.
Anti-CGRP monoclonal antibodies in chronic cluster headache
Authors: Costa Aline Turbino Neves Martins da
Published: June 2021

Commentary
Femicidio y violencia de género. Percepciones de mujeres estudiantes de educación superior acerca del femicidio
Authors: Brito Rodríguez Sonia de las Nieves , Basualto Porra Lorena , Posada Lecompte Margarita
Published: June 2021

El artículo tiene como propósito describir las percepciones de mujeres estudiantes de la educación superior sobre el femicidio. El estudio se realiza desde una metodología cualitativa con una perspectiva fenomenológica. Los resultados señalan que el femicidio es un flagelo social que las mujeres advierten cercano a sus propias vidas; produce emociones encontradas de miedo, ira e inseguridad debido a sus experiencias en los entornos mediatos y se percibe como el resultado final del ciclo de violencia relacional y de la exigüidad de mecanismos para su prevención y control.
Caracterización de la calidad de vida barrial en contextos de crisis; una mirada a experiencias en barrios y comunidades del sector San Luis de Peñalolén
Authors: Labarca Ramírez Sergio Andrés
Published: June 2021

En la presente investigación se propone explorar y definir la calidad de vida desde una mirada barrial o comunitaria, entendiendo como las dimensiones que componen este nivel de análisis de la calidad de vida permiten entender mejor los fenómenos barriales y así el desarrollo humano en ellos. Así como también se busca entender la incidencia de los contextos de crisis desde la mirada de la calidad de vida barrial, esto potenciado por los procesos de crisis sociales y sanitarias que han vivido las comunidades chilenas en los últimos años. Para esto se realizaron grupos focales y encuestas (N=200) en el sector San Luis de Peñalolén, lo que generó datos que permiten entender y definir la calidad de vida barrial o comunitaria y sus dimensiones, en conjunto a la incidencia que tienen en los contextos de crisis y su rol como parte de la calidad de vida en los barrios.
Sociodemographic characteristics and probabilities for the labor inclusion of people with disabilities in Chile. Implications for critical social policies
Authors: Andrade Guzmán Carlos , Reyes Martínez Javier , Valencia Gálvez Lorena
Published: June 2021

En Chile, la inclusión laboral de personas en situación de discapacidad es baja. Utilizando la Segunda Encuesta Nacional de Discapacidad de Chile y ejecutando un modelo de regresión logística (N = 2.618), este estudio explora cómo el sexo, la educación, la edad y el nivel de dependencia funcional se asocian con la probabilidad de que las personas en situación de discapacidad se inserten en el sistema laboral. Los hallazgos sugieren que ser mujer en situación de discapacidad o ser mayor reduce la probabilidad de tener trabajo. Además, tener más años de educación aumenta la probabilidad de que lo tenga. El trabajo presenta implicancias de los hallazgos para las políticas sociales críticas.