bluuebunny/crossref_metadata_2025 huggingface dataset:
THE CONCEPT OF AN EQUATION AND WAYS OF THEIR SOLUTION IN MATHEMATICS IN THE PRIMARY SCHOOL
Authors:   Osh State Pedagogical University, Nadyrbekova Gulaim , Kaldybaev Salidin ,   "Ala-Too" International University
Published: February 2024

The article discusses the methods of teaching the concept of an equation in primary school mathematics and ways to solve them. The concepts of numerical equality and inequality are used, the methodology for teaching the concept of an equation is shown. Problems are solved by analyzing equations and creating relationships between operations and components. Exercises for self-acquaintance with practical examples for learning to solve equations were proposed. The activity of students in solving problems, in analyzing systematization and in checking exercises is noted. To promote the development of communicative competence, the ability to cooperate with other people, and methods of mutual assistance are provided when working in pairs. The activity of students in solving problems, in analyzing systematization and in checking exercises is noted. To expand the mathematical horizons of students and increase interest in mathematics, methods have been proposed to learn how to find the values of numerical expressions in a convenient way. The main focus is on the actions of their active use in the classroom, determining the main and subject compotencies, several exercises prepared on the basis of practice are shown, recommended by the method of determining expected results.
ELEMENTARY SCHOOL STUDENTS HAVE THE FORMATION OF READING SKILLS
Authors:   Jalal-Abad State University named after B. Osmonov, Temirbayeva Gulzad , Maatazimova Gulzat ,   Jalal-Abad State University named after B. Osmonov
Published: February 2024

The article will focus on the formation and development of reading skills in elementary school students. Definitions of the following terms in pedagogy are given: “reading skill", “reading technique", “reading comprehension", “correct reading", “fluent reading", “expressive reading", “intonation". 4 components of the reading skill are considered, as well as the conditions for managing the process of forming the reading skill. Along with the term "learning skill", the concept of "learning technique" is used. Study technique is a study method, pace and its correctness. Reading technique and comprehension are considered as two sides of the learning process. Technique is an integral part of reading comprehension. And the main purpose of reading is understanding. All of these learning components are interrelated and interdependent. Thus, the process of teaching a student to read should be built, taking into account the simultaneous work on all four components of reading skills, forming all these components in a complex and closely related relationship.
Dynamic models of competition with endogenous network formation. A case of constant output
Authors: Кочевадов Виталий Алексеевич , Kochevadov Vitalii , Седаков Артем Александрович , Sedakov Artem
Published: February 2024

The paper examines discrete-time network models of competition with a finite planning horizon. Firms produce a homogeneous good in constant quantities and sell it on a common market. In the non-terminal period, the behavior of each firm is characterized by a multi-component profile that includes, among other things, the amount of investment and the structure of bilateral links with partner firms. The latter affects the technological state of the firm and allows it to reduce its current costs. The endogenous structure of partner firms is described by a network. For the models studied, the Nash equilibrium is characterized in a class of open-loop strategies.
The Mariana Trench of transphobia in South Africa: The legislative lacunae in KOS v Minister of Home Affairs
Authors: Baird Sophy
Published: February 2024

Society as a whole has for eons been premised on the importance of patriarchy and heteronormatity. During this time society has seen gradual leaps regarding people in the LGBTQI+ community. South Africa appears to be at the foreground of this recognition of the rights of people in this marginalised grouping. However, what may be present on paper may not appear to be what it is. This case discussion examines the extent to which, among others, the Alteration of Sex Description and Sex Status Act as well as the Marriage Act fail to address the matters ancillary to transgender individuals and the glaring discrimination faced by the transgender community in the face of a country that prides itself in a sense of equality that unfortunately is not enjoyed by all its people. To illustrate this point, it is important to examine the above-mentioned Acts in conjunction with KOS v Minister of Home Affairs. There appears to also be a glaring deficit in the fundamental understanding between sex and gender within the legislation and a need to update the legislation to the contemporary shift in the issues faced by the LGBTQI+ community.
A new method for long-term safety analysis of marine structures
Authors: Wang Y G
Published: February 2024

This paper proposes to utilise a new adaptive kernel density estimation (KDE) method based on a linear diffusion process for fitting the significant wave height data in order to calculate the sea state parameter distribution tails more accurately, particularly the higher, more extreme values. The accuracy of the proposed method has been demonstrated based on fittings to two measured ocean wave datasets. This proposed method has subsequently been utilised for deriving accurate 50-year and 500-year environmental contour lines. The advantages of using a more reliable contour line derived from using the proposed new method for long-term safety analysis of marine structures have been substantiated.
Hacia un modelo colaborativo de evaluación en la formación de futuros profesores de lengua extranjera (Inglés)
Authors: Gutiérrez Pérez Regina , Casal Medinabeitia Sonia , Moore Pat
Published: February 2024

Esta aportación expone la implementación y los resultados de un proyecto de innovación docente sobre evaluación llevado a cabo en las asignaturas del módulo específico de lengua extranjera (Inglés) en el Máster de Profesorado de Educación Secundaria Obligatoria y Bachillerato, Formación Profesional y Enseñanza de Idiomas de la Universidad Pablo de Olavide de Sevilla (UPO). Concretamente, presenta y analiza la puesta en práctica de un modelo integrado de evaluación que ha promovido la colaboración e intercambio de ideas entre el profesorado de dicho módulo. Los resultados, evaluados mediante dos cuestionarios distribuidos al profesorado y al alumnado y la puesta en común por parte del equipo docente al finalizar la actuación, muestran que el modelo implementado ofrece ventajas a la vez que señala aspectos que deben seguir mejorándose en futuras ediciones del máster.
Unveiling the New Frontier: ChatGPT-3 Powered Translation for Arabic-English Language Pairs
Authors: Alkhawaja Linda
Published: February 2024

This study evaluates the aptitude of ChatGPT for Arabic-English machine translation. The main objective of this research is to scrutinize the quality of ChatGPT's translations and compare its performance against machine translation systems, such as Google Translate, which are intricately tailored for translation purposes. In addition, the study seeks to investigate the potential integration of ChatGPT into translation workflows. Furthermore, we aspire to discern whether ChatGPT's translation efficacy harmonizes with or diverges from the profound finesse exhibited by human translation expertise. To accomplish this, a comparable corpus of 1000 English sentences and their corresponding Arabic translations was employed to evaluate the translation outputs of both machine translation systems alongside a human translation reference. The corpus was sourced from Tatoeba, an open online platform and underwent electronic assessment using the BLEU (Bilingual Evaluation Understudy) metric. The results indicate a marginal advantage of ChatGPT over Google Translate in delivering high-quality translations. Upon evaluating the corpus, we ascertain that ChatGPT performs impressively well compared to specialized translation systems like Google Translate. However, despite these promising findings, it is essential to acknowledge that even the most advanced machine translation technology, ChatGPT, cannot currently match the proficiency of human translation, at least not in the near future.
Ciudad educadora, discapacidad e inclusión social. Propuesta de un marco ideológico para la implementación de políticas públicas a favor de la población con discapacidad
Authors: Salcedo Serna Marco Alexis , Peñaloza Tello Martha Lucía
Published: February 2024

En este artículo se analiza uno de los marcos de comprensión empleados para un proyecto de investigación en el que se propone crear un observatorio urbano para la población con discapacidad en el suroccidente de Colombia. El texto parte del supuesto de que cualquier proyecto político de transformación urbana requiere de un marco ideológico que le dé sustento. La propuesta de una ciudad educadora corresponde a ese marco político requerido para ponderar las posibilidades de inclusión social de personas con diversas formas de discapacidad —motora, sensorial y cognitiva—. Este texto indica el sentido histórico y político al que responde esta propuesta ideológica de ciudad, expone los dos principales modelos de comprensión que hay sobre la discapacidad y a partir de ahí destaca la transcendencia que tiene ciudad educadora para justificar socialmente políticas públicas a favor de personas con alguna forma de discapacidad, dado que fundamenta ideológicamente tales políticas no en llamados de solidaridad social para una población considerada vulnerable, sino en el enaltecimiento de la diferencia identitaria como nodo central de la estructura política contemporánea.
Crítica y crisis del capitalismo. De Marx a la teoría crítica del valor y del devenir-renta de la ganancia
Authors: Gallegos Enrique G.
Published: February 2024

Para la teoría política es fundamental conocer la teoría del valor-trabajo de Marx porque establece que la crisis es producto de las contradicciones entre capital y trabajo. El artículo discute las interpretaciones que la teoría crítica del valor y la del devenir-renta realizan de la teoría de Marx y las posibilidades de la salida de la crisis y del sujeto político del cambio. En ese marco ¿cuáles son las aportaciones de una y otra teoría? Mientras para la teoría crítica del valor la única salida es el inevitable colapso del capitalismo y la imposibilidad del sujeto político; para la segunda, dado que el capital captura la vida y el tiempo social en su integridad (el denominado capitalismo cognitivo), argumenta la necesidad de democratizar la ganancia social y la constitución del sujeto político en el ingreso básico universal. Empero, ambas teorías tienen sus limitaciones: la primera por la ausencia del sujeto político del cambio, la segunda por la latencia de la crisis, pues no se hace cargo de las contradicciones inmanentes al capitalismo
La visualidad del mal. Prensa y proceso de paz en Colombia en los periódicos El Heraldo y El Colombiano, 2014-2016
Authors: Olaya Gualteros Vladimir , Urrego Salas Andrés Felipe
Published: February 2024

El artículo analiza imágenes sobre los diálogos de paz en La Habana, Cuba, en las que se identifica alguna imputación moral y que se difundieron en los periódicos regionales colombianos El Heraldo y El Colombiano entre 2014 y 2016. La etapa se caracterizó por una fuerte polarización entre los detractores y defensores de la construcción de un acuerdo de paz en Colombia. El texto analiza el papel de las imágenes en la construcción de la significación del mal, el modo en que ellas constituyen unos modos de ver y configurar subjetividades. A partir de la perspectiva de los estudios visuales se comprende que las imágenes son dispositivos que constituyen significados en colaboración con las palabras, pero a su vez son contenedoras de emociones, sentimientos y pensamientos que interpelan los modos de ver y narrar el mundo social, ético y político. Se concluye que hay unas tramas narrativas homogéneas y reiterativas en las que se manifiesta una oposición radical entre los agentes del conflicto armado en Colombia, lo cual deslegitima las soluciones dialogadas y exalta la continuidad de la violencia.
Energy use in the production of unrefined sugar in Colombia (exergy analysis)
Authors: Velásquez Héctor , Agudelo Andrés , Chejne Farid
Published: February 2024

The aim of this study is to determine how energy resources are used in the production of unrefined sugar in Colombia. To do this, measurements were carried out in eight sugar mills that represent the typical production processes for unrefined sugar. These data were used to obtain first and second law balances, which were then used to calculate efficiencies and some energy use indicators. By comparing the mills it was found that technological improvements enable energy efficiency to be increased to acceptable levels due to better combustion processes and reductions in energy losses from exhaust gases and heat transfer to the walls. The effect of these improvements in second law efficiency is not significant, which suggests that cogeneration systems should be implemented in large-scale production processes in order to make a better use of the energy resources.
Collaborative robotics modular system used in education
Authors: Jiménez Builes Jovani Alberto , Ramírez Patiño Juan Fernando , González España Juan José
Published: February 2024

This article illustrates the currently use of robotics as an educative tool to strengthen creativity, design and learning skills. the main approaches in this topic, including the Robotic Multi-Agent System RobEd are presented. The application of RobEd, which is currently being developed by the Universidad Nacional de Colombia, is focused on the high-school students of K-10 and K-11.
Airplane of the muda: support tool for the teaching-learning experience of lean manufacturing
Authors: Pérez Rave Jorge Iván
Published: February 2024

This paper proposes a game called “Airplane of the muda”, designed to complement the theoretical classes of lean manufacturing with practical elements allowing to incorporate constructivist principles and collaborative learning based on the teaching-learning process problems of: 7 mudas, 5’S and visual management. This game is exposed based on a theoretical framework for lean manufacturing and some learning theories. Then, provides: case study, materials, distribution, roles, procedures and production runs with the corresponding characterization in cycle times and tack time. From the academic point of view a gap in knowledge is fi lled in the specifi c fi eld for which the article was developed, and besides at a general level there is information for faculty, students and researchers, such as: ideas for future work and methodological elements that serve as a guide to study and generate other games, to support theoretical courses. On a practical level, given its design, simplicity and accessibility of materials needed, the game can be deployed as it is on Lean manufacturing courses of any institution.
Automatic metric collection to a repository of measurements
Authors: Lugo García José Alejandro , García Pérez Ana María
Published: February 2024

This paper proposes an automatic collection process from measurements of produced software. It would be possible to obtain indicators of productivity and associated effort, through an environment built entirely on free software.
Service discovery platform for ubiquitous environments
Authors: Hermida Víctor Alberto , Corrales Juan Carlos , Caicedo Oscar , Suarez Luis , Rojas Luis
Published: February 2024

The capability to easily fi nd useful services in ubiquitous environments becomes increasingly critical in several application domains. Current approaches for ubiquitous services retrieval are mostly limited to the matching of their inputs/outputs possibly enhanced with some ontological knowledge. Recent research has demonstrated that this approach is not suffi cient to discover relevant services. Motivated by these concerns, this work proposes a service discovery platform in ubiquitous environments based on behavior matchmaking. We argue that in many situations the service composition process requires a service discovery phase based on matchmaking of behavior specifi cations of the components. Consequently, even if a service that meets exactly the user requirements does not exist, the most similar ones will be retrieved.
Effect of the synthesis variables of TiO2 on the photocatalytic activity towards the degradation of water pollutants
Authors: Castro López Camilo Andrés , Reyes Gómez Sonia Esperanza , Centeno Hurtado Aristóbulo , Giraldo Duarte Sonia Azucena
Published: February 2024

In this work, TiO2 photocatalysts were synthesized using a conventional sol-gel and hydrothermal synthesis methods with steam pressure treatment. Photocatalysts were characterized by X-ray diffraction (XRD), diffuse reflectance spectra (DRS) and N2 adsorption-desorption. The photoactivity of the samples was analyzed towards the photooxidation of the azo dye Orange II (Or-II) and phenol using different illumination set-ups to compare the activity features of photocatalysts. The effect of the synthesis variables such as the synthesis route, water/alcoxide and alcohol/alcoxide ratios, as well as the alcohol type was analyzed. TiO2 photocatalysts obtained by hydrothermal synthesis have a better photoactivity than the particles synthesized by the chosen sol-gel route, reaching the Or-II degradation photoactivity of the commercial TiO2 P25. On the other hand, the water/alcoxide ratio and alcohol type have a marked effect on the photoactivity of the hydrothermal synthesized TiO2, whereas the alcohol/alcoxide ratio does not have a relevant effect on the Or-II degradation photoactivity.
Oligomerization of propene over ZSM-5 modified with Cr and W
Authors: Santa Arango Alejandra María , Escobar Garcés Carlos Mario , Agudelo Valderrama José Luís , Guzmán Monsalve Alexander , Palacio Santos Luz Amparo , Echavarría Isaza Adriana
Published: February 2024

In this paper, the composition of ZSM-5 was modified with Cr and W by impregnation, isomorphous substitution and ion exchange, and the resulting catalysts were evaluated in the oligomerization of propene.
Simulation of the evaporation of drops from palm and castor oil biodiesels based on physical properties
Authors: Botero Maria Luisa , Molina Alejandro
Published: February 2024

A reduction of oil reserves and an augmented production of greenhouse gases from fossil fuels have increased the use of biodiesel in internal combustion engines. Although physical and chemical properties of biodiesel and diesel are similar enough that allow the use of pure biodiesel in a traditional engine without considerable adjustments, differences in chemical structure of diesel and biodiesel change vaporization and combustion rates and can affect engine performance. In this study a model that can predict the evaporation rate of palm and castor oil biodiesel droplets at atmospheric pressure was developed. The model was validated with experimental data from the literature for the evaporation of n-heptane-droplets. The model estimates thermo-physical properties of biofuels using contribution group theory and was used to determine that castor oil biodiesel presents a lower evaporation rate than palm oil biodiesel due to differences in their physical properties (mainly density and vaporization enthalpy) which can be explained by a longer molecule and the presence of a hydroxyl groups in methyl ricinoleate, its main component.
Optical fiber metrology to small displacements detection
Authors: Duarte Julio Enrique , Fernández Morales Flavio Humberto , Moreno Sereno Mauricio , Mora Almerich José , Andrés Miguel Vicente
Published: February 2024

This work presents a methodology to measure deflections in the range of microns in thermo-pneumatic silicon micomembranes. This method is based on the fiber optic interferometry, which was used to study the static behavior of a silicon membrane of 10 mm in thickness, 5 mm in side length and 300 mm in bulk, which was glued to a glass slide. Static behavior is defines as the membrane deflection measurement taking into account only its response to the infrared radiation energy that drives them.
Security middleware for IMS-WLAN interworking
Authors: Caicedo Oscar , De La Cruz Edgar , Taimal Geovanni
Published: February 2024

The 3GPP proposes security architecture for Interworking WLAN-3GPP. However, it presents inefficiencies in the authentication procedure, which bring a greater consumption of radio resources, processing on the devices and delayed authentication. Due to previous reasons, we propose a security middleware that reduces the steps in the authentication of the WLAN-3GPP interworking and ensures the SIP signaling between the user equipment and the first entry point to the IMS network (P-CSCF).
harmony search algorithm for clustering with feature selection
Authors: Cobos Carlos , León Elizabeth , Mendoza Martha
Published: February 2024

This paper presents a new clustering algorithm, called IHSK, with feature selection in a linear order of complexity. The algorithm is based on the combination of the harmony search and K-means algorithms. Feature selection uses both the concept of variability and a heuristic method that penalizes the presence of dimensions with a low probability of contributing to the current solution. The algorithm was tested with sets of synthetic and real data, obtaining promising results.
Variables that dynamize access to information and communication technologies in middle income families from Aburrá Valley
Authors: López Sandra María , Cárdenas Soto Ana María , Pérez Héctor Alonso
Published: February 2024

This paper presents the methodology for the selection of the most important or essential variables to access information and communication technologies (ICT) in middle-income families from a developing country. The variables are chosen through a combination of three different methods for the interpretation of the results based on structural analysis using MICMAC (Impact Matrix Cross-reference Multiplication) software.
Análisis de un sistema de almacenamiento de energía térmica usando cloruro de magnesio hexahidratado
Authors: Macía-Gómez Andrés Felipe , Parra-Alvarez Jhon Camilo , Chejne-Janna Farid
Published: February 2024

Se simuló el comportamiento del cloruro de magnesio hexahidratado (MgCl2*6H2O) como almacenador de energía térmica, que posee una temperatura de transición de fase de 117 °C; lo que lo convierte en un material con gran potencial en el área de las aplicaciones de mediana temperatura (aplicaciones industriales). Se desarrolló una simulación CFD usando el software FLUENT para describir la fusión/solidificación de la sal hidratada. Se observó el efecto del uso de aletas y las fuerzas boyantes producidas porlos efectos gravitacionales.
Use of the information gathered during I/M programs to estimate emissions from gasoline vehicles
Authors: Huertas Jorge Ignacio , Mendoza E. , Córdoba Jorge
Published: February 2024

Currently, most of the vehicular emissions inventories developed for large cities are based on the emissions factors developed by the US EPA. Trying to use the US EPA MOBILE tool, the local environmental authorities concentrate their efforts in modifying those emissions factors to take care of the particular characteristics of each city. However, there is still a need for a methodology based on experimental tests to improve the accuracy of the emissions inventories developed for large cities. To address this need, the present work proposes a methodology to improve the accuracy of the vehicular emissions inventory using the information gathered during the inspection and maintenance (I/M) programs where the emissions of 100% of the vehicular fleet is evaluated using the ASM 5015, ASM 2525 or similar type of tests. Experimental work on road and on a chassis dynamometer was developed to explore the feasibility of implementing such methodology for the case of the constant speed mode of operation in a particular type of car. Preliminary results show that the proposed methodology has the potential to be implemented for the case of constant speed mode of operation.
Estudio de la fotodegradación del clorotalonilo usando las técnicas de fenton y fotocatálisis con dióxido de titanio mediante radiación solar
Authors: Vásquez Esmeralda , Peñuela Gustavo , Agudelo Sergio
Published: February 2024

Para el diseño de sistemas de tratamiento de afluentes residuales se requiere determinar el tiempo de degradación de los contaminantes a escala y con dicha información se puede calcular el tiempo de residencia del agua en el tratamiento seleccionado. En los sistemas de tratamiento con colectores solares, el tiempo de fotodegradación del contaminante dependerá de la intensidad de radiación solar, la cual varía con la hora del día y las condiciones ambientales. En el presente trabajo mediante un colector solar se evaluó la fotodegradación del plaguicida Clorotalonilo con dióxido de titanio y con el reactivo de Fenton, respectivamente, realizándose los ensayos en la ciudad de Medellín (6º latitud norte y 1570 metros sobre el nivel del mar, msnm). El 95% de la degradación del Clorotalonilo se alcanzó con 500 mg/l de TiO2 y 1,0 mg/l de persulfato de sodio en 4 horas de irradiación solar, con una energía acumulada de 15,1 kJ/l. Igual porcentaje se alcanzó con 10 mg/l de ión Férrico en 18 horas de irradiación solar con una energía acumulada de 38 kJ/l. La cinética de degradación fue de primer orden con ambas técnicas de tratamiento, pero con el dióxido de titanio se obtuvo una mayor constante de degradación y un mayor grado de mineralización (80%) que con el foto-Fenton (72%). Lamineralización de los compuestos orgánicos (Clorotalonilo y subproductos de degradación) se comprobó por la desaparición del carbono orgánico total (COT) y la formación de cloruros y nitratos. Se detectaron 6 productos de degradación que a pesar de su baja concentración pueden ser los responsables de la alta toxicidad del efluente final en los bioensayos con Dapnhia pulex.
Effects of the synthetic method on the particle size and purity of magnetite
Authors: Jaramillo-Tabares Beatriz , Zuleta-Gil Alejandro Alberto , Jaramillo-Isaza Franklin
Published: February 2024

The characterization of magnetites synthesized by methods reported with some modifications is presented. The influence on purity and particle size of the obtained oxides is discussed. The samples were characterized by Mössbauer Spectroscopy at room temperature, particle size analysis by light scattering and by transmission electron microscopy of naked particles. The results showed that depending on the method of synthesis there are variations on stoichiometry and composition of magnetites, being this difference more important when the rate of addition of the alkaline solution to the combined ferrous and dispersant solution is changed. Moreover, it has been found strong agglomeration evidenced by TEM, however the sizes of the individual crystallites are in the nanometer scale.
Electrostatic tip-dielectric sample interaction in electrostatic force microscopy
Authors: Gómez Ariel , Ávila Alba Graciela , Massy Gergory Ibrahim
Published: February 2024

Electric force microscopy is a local technique for measuring electrical properties of materials. The electrostatic force gradient measurements on dielectric samples are sensitive not only to the initial charge distribution in the sample but also to the charge induced by the conductive bias cantilever. Interpreting the contribution of each single effect on the charge distribution images is a challenge in the existing EFM technique. Here, a theoretical model is introduced to study the charge and induction effect on charged dielectric samples and commercial geometries for EFM tips. This model estimates the initial charge of the sample based on force gradient measurements. Gradient force results reproduce experimental measurements performed on electrets samples.
Seguimiento de trayectorias y objetivos en tierra usando un dirigible y visión artificial
Authors: Catuche Juan , Sterling Julio , Bacca-Cortes Bladimir
Published: February 2024

Este artículo presenta un sistema robótico autónomo compuesto por un dirigible para interiores, un sistema de vídeo inalámbrico, un PC y una aplicación para el seguimiento de trayectorias y objetivos en tierra con alto contraste. Se ha simplificado el modelo del dirigible con el fin de obtener su modelo lineal, con el cual se han definido objetivos de control como la orientación relativa del dirigible y la distancia de éste a objetivos en tierra. Se ha diseñado una estrategia de control PD tanto para la orientación como para la distancia a los objetivos, alcanzando un tiempo de estabilización de 5s y un sobre-impulso de 5%. La cámara es el único sensor de realimentación, cuyas imágenes son procesadas para: la segmentación de trayectorias, usando la transformada de Hough, el operador de Canny y un filtro mediana; la segmentación de objetos en tierra, usando diferenciación por color en HSI. Se realizaron pruebas para el seguimiento de trayectorias lineales, curvas y una combinación de ellas, arrojando errores de orientación inferiores a ±14º y distancia de ±5pixeles. Se realizaron pruebas para el seguimiento de objetivos en tierra, describiendo trayectorias lineales y curvas, arrojando errores de distancia de ±39 pixeles que corresponden al 8,33% de las dimensiones de la imagen y orientación enel sentido del objetivo de ±12º.
Conrprop: un algoritmo para la optimización de funciones no lineales con restricciones
Authors: Villa Fernán , Velásquez Juan , Jaramillo Patricia
Published: February 2024

Resilent backpropagation (RPROP) es una poderosa técnica de optimización basada en gradientes que ha sido comúnmente usada para el entrenamiento de redes neuronales artificiales, la cual usa una velocidad por cada parámetro en el modelo. Aunque esta técnica es capaz de resolver problemas de optimización multivariada sin restricciones, no hay referencias sobre su uso en la literatura de investigación de operaciones. En este artículo, se propone una modificación de resilent backpropagation que permite resolver problemas no lineales de optimización sujetos a restricciones generales no lineales. El algoritmo propuesto fue probado usando seis problemas comunes de prueba; para todos los casos, el algoritmo de resilent backpropagation restringido encontró la solución óptima, y para algunos casos encontró un punto óptimo mejor que el reportado en la literatura.
Gestión del conocimiento en un programa de mejora de procesos de software en MiPyMEs: KMSPI Model
Authors: Capote Joanna , Llantén Carlos Julián , Pardo César , Collazos César
Published: February 2024

Durante la realización de los programas de Mejora de Procesos de Software (SPI), se genera una gran cantidad de conocimiento que es necesario gestionar, activos de conocimiento tales como Lecciones Aprendidas, Mejores Prácticas, Experiencias, Problemas y Soluciones que contribuyen tanto al aprendizaje individual como del programa mismo. Este artículo presenta el modelo planteado para gestionar activos de conocimiento generados durante la ejecución de los programas de SPI, a la vez que se establece como unainiciativa para crear una cultura orientada hacia la Gestión del Conocimiento. El modelo de Gestión del Conocimiento para los Programas de Mejora de Procesos de Software llamado, Modelo KMSPI, ha sido validado en dos MIPYMES DS, en las que se crearon Comunidades de Práctica (CoP) con el fin de llevar a cabo dentro de ellas cada uno de los procesos planteados por el modelo.
An Updated Model Using a Reflection Coefficient for Predicting Performance of Pressure-Retarded Osmosis
Authors:   Department of Chemical and Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, AL-Musawi Osamah A.H. , Mohammad Abdul Wahab ,   Chemical and Water Desalination Engineering Program, College of Engineering, University of Sharjah, Sharjah, 27272, United Arab Emirates, Lun Ang Wei ,   Department of Chemical and Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, B. Mahood Hameed ,   Department of Chemical and Process Engineering, University of Surrey, UK, Guildford, Surrey, UK, H. Kadhum Abdul Amir ,   University of Al-Ameed, Karbala, Iraq
Published: February 2024

Mathematical model was used to predict the performance of membrane process. In this study, an updatedmathematical model has been developed to study the forward osmosis (FO) and pressure-retarded osmosis (PRO) processes. This model has been advanced by taking into consideration the reflection coefficient, internal and external concentration polarizations, and structural membrane parameters, as well as the equations of applied pressure and mass transport for feed and draw solutions together. The model was validated through prediction of the water and salt fluxes using the membrane performance data published in other articles. The estimated values of the reflection coefficient ranged from 0.868 to 0.9 for FO and 0.9 to 0.95 for PRO. For this reason, it is not possible to consider the reflection coefficient to be equal to one as normally assumed in membrane modeling study. Other findings have showed that the varying salt fluxes at different concentrations and cross-flow velocities adversely impacted the FO and PRO modules. Internal and external concentration polarizations have been studied and compared with their effect on the effectiveness of the FO/PRO process. The model has demonstrated its ability to predict flux in the PRO greater than FO because of the model primary reliance on the applied pressure to drive the osmotic process. The ratio of must be effectively managed to correspond with operating limits and the value must also be kept to a minimum in order to avert the drastical drop in the flux, the fouling, and the membrane damage.
Uncertainty Factors of a Finite Element Model using the Fuzzy Analysis Method
Authors:   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak, Malaysia, Mohamad Suffian Mohamad Syazwan Zafwan , Kamil Syahiir ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment,  Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia, Ariffin Ahmad Kamal ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment,  Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia, Azman Abdul Hadi ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia, M Ibrahim Israr ,   Universitas Syiah Kuala (USK), Banda Aceh, Indonesia
Published: February 2024

The recent advancement in manufacturing technology in the automotive and aerospace sectors has led to the invention of advanced structured material, which is lightweight and a complex geometry model that can be manufactured. As it is related to human safety and hazards, the need for uncertainty analysis in a structure before and after a manufacturing process is a primary concern. Thus, this paper analyzes the uncertainty parameters of a meshed finite element model in the geometry, boundary condition, load, and material properties. An uncertainty analysis numerical tool, the fuzzy analysis method, is applied in Excel-VBA as the simulation platform. Each uncertainty parameter is in a range of numbers, with a maximum and minimum value as the limit. The α-cuts determine the fuzzy analysis output on the membership function. The deterministic value of the variable is implemented for comparison purposes. The simulation result for the von-Mises stress analysis has significantly impacted the uncertainty analysis as its curve has surpassed the yield strength limit of the material. The simulation output for the displacement has a more considerable uncertainty dispersion when compared to the other results. This study helps to find a better security margin of a structure for its sustainability in the future.
Structural Design of RCC Building Using Integrated BIM-Based Design Workflow and Analysis Result Comparison between ETABS and RSAP
Authors:   Department of Civil Engineering, Faculty of Engineering & Architecture, Balochistan University of Information Technology,  Engineering and Management Sciences (BUITEMS), Quetta, Balochistan, Pakistan, Yousaf Muhammad , Sohail Mohammad ,   Department of Civil Engineering, Faculty of Engineering & Architecture, Balochistan University of Information Technology,  Engineering and Management Sciences (BUITEMS), Quetta, Balochistan, Pakistan, Tayyab Muhammad ,   Department of Civil Engineering, Faculty of Engineering & Architecture, Balochistan University of Information Technology,  Engineering and Management Sciences (BUITEMS), Quetta, Balochistan, Pakistan, Javedan Muhammad ,   Department of Civil Engineering, Faculty of Engineering & Architecture, Balochistan University of Information Technology,  Engineering and Management Sciences (BUITEMS), Quetta, Balochistan, Pakistan, Habib Muhammad ,   Department of Civil Engineering Technology, National Skills University Islamabad, Pakistan
Published: February 2024

Rapid computerization and stakeholder integration in the construction industry stressed the need for a new design methodology that was only possible through BIM. To address the inefficiency and limitations of conventional design flow that lead to design clashes, information loss, delays, and poor stakeholders’ coordination throughout the design phase, as well as the designer’s reluctance to use BIM-integrated software for design. This study aims to develop an integrated design flow using the Autodesk system followed by structural design through the developed flow. Further, the study also aims to identify and resolve design clashes between architectural and structural models and incorporate analysis results comparison of RSAP and ETABS. The results of the study revealed that BIM design flow provided better coordination between stakeholders, speedy clash detection, and resolved bi-directional interoperability issues using an extension (structural analysis toolkit). Furthermore, design through BIM provided better visualization i.e., both 2D and 3D, and final documentation in the shape of structural detailing of designed elements. Navisworks successfully identified coordinate and element clashes between architectural and structural models and provided a virtual 3D representation of the facility before the construction phase. The analysis results of RSAP and ETABS revealed that RSAP gives higher analysis results than ETABS due to the different analysis procedures of the two software packages thus yielding safer design.
Design of Fuzzy Logic based Adaptive Active Power Controller to Enhance Power sharing among DGs in an Autonomous Microgrid
Authors:   Department of Electrical Engineering, Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat, India, Matharani Kinnari , Jariwala Hitesh ,   Department of Electrical Engineering, Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat, India
Published: February 2024

This paper presents the design of an adaptive active power controller to enhance the power-sharing capabilities of distributed generators (DGs) in an autonomous microgrid. Each DG in an autonomous microgrid consists of a droop-controlled inverter to control active and reactive power by regulating frequency and voltage correspondingly. The high droop gain can be used in the power controller to encourage faster power sharing among the DGs. However, high droop gain can cause undamped growing oscillations during load fluctuations or generation losses. During such events, attaining faster power-sharing between DGs using high droop gains is difficult. So, the problem with an autonomous microgrid is the conflict between faster power sharing and stability. Stability needs to be compromised to attain quicker power sharing and vice versa. Hence, to achieve power-sharing swiftly with high droop gain and to diminish the growing oscillations caused, this paper proposes a fuzzy logic-based adaptive active power controller (FLAPC). The proposed FLAPC is adaptive and easy to implement. It offers faster power sharing for different values of droop gains and step change in load. The FLAPC is developed in MATLAB 2018a/Simulink environment, and time domain simulations are performed to see the efficacy of the proposed controller. The results of time domain simulations are compared with a droop controller without any additional controller, conventional lead-lag power system stabilizer, and proposed controller for step change in load at different droop gains. The results show that the proposed controller enhances the power-sharing performance and also ameliorates the system’s stability by reducing the settling time and overshoot in active power responses of DGs.
Mental Workload and Road Environment Complexity: Subjective Assessments
Authors:   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti  Kebangsaan Malaysia, 43600 Bandar Baru Bangi, Selangor, Malaysia, Kabilmiharbi Nurainaa , Khamis Nor Kamaliana ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti  Kebangsaan Malaysia, 43600 Bandar Baru Bangi, Selangor, Malaysia
Published: February 2024

Since 2011, mental workload has been one of the top 10 causes of accidents in Malaysia, accounting for over a thousand fatalities yearly. Mental workload is defined as a comparable mediating variable to attention. The aim of this study is to identify the fundamental causes and influences that affect the difficulty of the road environment and vehicle task, as well as their impact on the driver’s health. In this study, subjective measurement is used to assess the level of mental workload of drivers which includes NASA-TLX and KSS on two different road environment condition namely urban and rural road environment. The findings show that the complexity of the road environment has a significant effect towards the mental workload of a driver. The average NASA-TLX score for urban roads is higher than the average score for rural roads while, the results for KSS level indicates higher drowsiness level among the drivers when driving on a rural road as opposed to an urban road. These results may serve as a guide for future research into the mental workloads of drivers in various types of complex road environments, as well as a practical guide for car manufacturers, agencies responsible for road safety, and researchers to improve the safety design of cars and consider external factors related to road environment complexity when designing roads.
ELV Policy and Management System in Malaysia: Exploratory Study of Dynamics, Rationale and Opportunity through Digitalised Public Services
Authors:   Department of Business, Faculty of Business and Communication, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia, Che Kasim Ahmad Nizam , Shaari Mohd Shahidan ,   Department of Business, Faculty of Business and Communication, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia, Zainol Abidin Noorazeela ,   Department of Business, Faculty of Business and Communication, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia, Zainol Abidin Juraini ,   Department of Business, Faculty of Business and Communication, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia, Hashim Noor Azuan ,   Faculty of Economics and Management, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia, Molla Altaf Hossain ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan  Malaysia, 43600 UKM Bangi, Selangor, Malaysia, Harun Zambri ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan  Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Published: February 2024

A sustainable end-of-life vehicle (ELV) management system requires a well-thought and well-designed process covering strategies, regulations, technologies, and future adaptive systems. Among others is the urgent need for feasible implementation of the integrated vehicle deregistration process, especially to kickstart the process for registered abandoned vehicles (approximately eight million units nationwide in 2018). In line with this aspiration, this study will explore the dynamics, rationale, and opportunity for public services to have a unified digitisation platform. This initiative will integrate networks of public (e.g., Ministry of Transport, Ministry of Housing and Local Government, Ministry of Environment and Water, Local councils, Road and Transportation Department, courts, Royal Malaysian Police), industry (e.g., authorised automotive treatment facilities (AATF), scrapyards) and other related parties. Those entities are critical to developing local ELV management system capacity to address current complex problems and achieve collective goals for the future automotive industry in Malaysia. Based on the Focus Group Discussion (FGD) outputs, literature survey, and relevant proposed frameworks, this study aims to enlighten policymakers on the necessity of having an integrated system in supporting various business, legal and administrative needs of the sustainable ELV Policy in Malaysia.
owards Energy Efficiency in Integrated Inventory Supply Chain Models: A Review
Authors:   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Sabtu Muhammad Idham , Hishamuddin Hawa ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Saibani Nizaroyani ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Ab Rahman Mohd Nizam ,   Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
Published: February 2024

Amidst the sustainability concerns of the industrial sector to fulfil the increase in customer demands, this study emphasizes on the characteristics of integrated inventory supply chains that is closely related to energy efficiency. Environmental and economic perspectives must be given equal consideration to ensure a competitive supply chain (SC). In response to global calls for sustainable energy and lower carbon emissions, the Malaysian government currently provides tax exemptions and allowances for the provision of green technology services and the acquisition of green technology assets. Furthermore, as sources of electricity are highly variable, efficient SC activities can feasibly minimise the cost of energy. Therefore, multiple studies have integrated the green concepts in SCs to develop energy efficient integrated inventory SC models. This present review examined 42 articles that assessed the environmental impact of integrated inventory SC models with a focus on energy efficiency and energy-related issues. A systematic literature review (SLR) was conducted to identify gaps in the existing literature and offer directions for future studies. The articles were categorised according to the SC dimensions of an integrated inventory model; such as categories of SC participants, structures, processes, and decision-making variables. Of the reviewed articles, only 35% examined energy efficiency or energy-related issues in integrated inventory models. Therefore, future studies should examine the energy efficiency or energy-related issues that integrated inventory SCs face.