Pub Date : 2020-05-01DOI: 10.15446/ing.investig.v40n2.82539
Carlos Aristizabal, P. Alvarado, Andrés Vargas
Second-generation biomass is a renewable resource that can address the increasing global energy demand and help to partially substitute the use of and dependence on fossil fuels, since it can be transformed into gas, liquid and/or solid fuels by physical, thermal, thermochemical and/or biological processes. However, its potential is not fully exploited because the process to extract the phytochemicals present in such organic byproducts has been largely omitted. Natural compounds are of interest to high value-added industries such as cosmetics and pharmaceutics. Therefore, this work proposes to thoroughly use such residual biomass in a biorefinery by a simultaneous, efficient and sustainable integration and operation of extraction processes to obtain phytochemicals and functional extracts. A thermochemical process known as gasification is implemented to produce syngas, which can be turned into fuels, chemicals, and energy such as methanol and synthetic gasoline. Furthermore, this review article describes the state of the art of each process and the concept of biorefinery.
{"title":"Biorefinery Concept Applied to Phytochemical Extraction and Bio-Syngas Production using Agro-Industrial Waste Biomass: A Review","authors":"Carlos Aristizabal, P. Alvarado, Andrés Vargas","doi":"10.15446/ing.investig.v40n2.82539","DOIUrl":"https://doi.org/10.15446/ing.investig.v40n2.82539","url":null,"abstract":"Second-generation biomass is a renewable resource that can address the increasing global energy demand and help to partially substitute the use of and dependence on fossil fuels, since it can be transformed into gas, liquid and/or solid fuels by physical, thermal, thermochemical and/or biological processes. However, its potential is not fully exploited because the process to extract the phytochemicals present in such organic byproducts has been largely omitted. Natural compounds are of interest to high value-added industries such as cosmetics and pharmaceutics. Therefore, this work proposes to thoroughly use such residual biomass in a biorefinery by a simultaneous, efficient and sustainable integration and operation of extraction processes to obtain phytochemicals and functional extracts. A thermochemical process known as gasification is implemented to produce syngas, which can be turned into fuels, chemicals, and energy such as methanol and synthetic gasoline. Furthermore, this review article describes the state of the art of each process and the concept of biorefinery.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82137593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-01DOI: 10.15446/ing.investig.v40n2.79469
André Oliveira Köhn, F. Silva
Los rodamientos son elementos mecanicos capaces de transferir movimiento entre dos o mas partes en una maquina. Cuando se aplica una carga externa, los elementos rodantes y sus anillos tienden a iniciar un movimiento ciclico entre ellos. Por lo tanto, estan vinculados por un tipo variable de contacto, creando altas tensiones superficiales. Como estos elementos estan sujetos a millones de ciclos en su vida util, estas tensiones ciclicas pueden crear grietas y causar fallas debido a la fatiga por contacto. Debido a la importancia de este tema, es vital estudiar el campo de tension causado por el contacto entre las partes rodantes en un rodamiento. Este documento ofrece dos enfoques sobre las tensiones ciclicas en un rodamiento rigido de bolas: un enfoque analitico, utilizando la teoria de Hertz para las tensiones de contacto; y una simulacion numerica, utilizando el Metodo de Elementos Finitos con el software Inventor y Nastran In-CAD. Los resultados de ambos enfoques se compararon y se analizo el comportamiento de las tensiones a medida que aumentaba la profundidad del anillo interior. Se llego a la conclusion de que las tensiones superficiales son muy superiores a la resistencia de los materiales utilizados en los rodamientos, y que el area influenciada por estas tensiones es pequena en comparacion con las dimensiones del conjunto.
{"title":"A study of the stress field generated by the contact between a sphere and a flat plate for a simplified model of deep-groove ball bearing","authors":"André Oliveira Köhn, F. Silva","doi":"10.15446/ing.investig.v40n2.79469","DOIUrl":"https://doi.org/10.15446/ing.investig.v40n2.79469","url":null,"abstract":"Los rodamientos son elementos mecanicos capaces de transferir movimiento entre dos o mas partes en una maquina. Cuando se aplica una carga externa, los elementos rodantes y sus anillos tienden a iniciar un movimiento ciclico entre ellos. Por lo tanto, estan vinculados por un tipo variable de contacto, creando altas tensiones superficiales. Como estos elementos estan sujetos a millones de ciclos en su vida util, estas tensiones ciclicas pueden crear grietas y causar fallas debido a la fatiga por contacto. Debido a la importancia de este tema, es vital estudiar el campo de tension causado por el contacto entre las partes rodantes en un rodamiento. Este documento ofrece dos enfoques sobre las tensiones ciclicas en un rodamiento rigido de bolas: un enfoque analitico, utilizando la teoria de Hertz para las tensiones de contacto; y una simulacion numerica, utilizando el Metodo de Elementos Finitos con el software Inventor y Nastran In-CAD. Los resultados de ambos enfoques se compararon y se analizo el comportamiento de las tensiones a medida que aumentaba la profundidad del anillo interior. Se llego a la conclusion de que las tensiones superficiales son muy superiores a la resistencia de los materiales utilizados en los rodamientos, y que el area influenciada por estas tensiones es pequena en comparacion con las dimensiones del conjunto.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"25 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82488380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-20DOI: 10.15446/ING.INVESTIG.V40N1.79376
A. Cabalar, Hayder Govar, M. Abdulnafaa, H. Isik
This paper aims to investigate the use of spiral aluminum computer numerical control milling waste (CNC-W) in the construction of road pavement subgrade. The soil (CL) was mixed with CNC-W spirals with ratios of between 0% and 20%, and 5 percent increments by dry weight with different water contents. California Bearing Ratio (CBR), Unconfined Compressive Strength (UCS), and consolidation tests were conducted. The experimental results indicated that the inclusion of CNC-W spirals increased the CBR value of clay up to the 15% mixture ratio, then decreased it. Similarly, the UCS value of clay was increased to the same ratio, whilst the UCS was not able to be determined due to the failing of all specimens with a mixture ratio higher than 15%. The permeability and swelling values, as well as the consolidation characteristics of the mixtures, were defined. The swelling percentages decreased from 1,15 cm/sec to 0,81 cm/sec with an increment in the CNC-W spiral content. A reduction was observed in the coefficient of permeability ( k ) values up to 15% mixture ratio, whilst it remained constant with change in CNC-W spiral content with a 20% mixture ratio. Coefficient of consolidation demonstrated a similar pattern of behavior to the permeability changes
{"title":"Aluminum Waste in Road Pavement Subgrade","authors":"A. Cabalar, Hayder Govar, M. Abdulnafaa, H. Isik","doi":"10.15446/ING.INVESTIG.V40N1.79376","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V40N1.79376","url":null,"abstract":"This paper aims to investigate the use of spiral aluminum computer numerical control milling waste (CNC-W) in the construction of road pavement subgrade. The soil (CL) was mixed with CNC-W spirals with ratios of between 0% and 20%, and 5 percent increments by dry weight with different water contents. California Bearing Ratio (CBR), Unconfined Compressive Strength (UCS), and consolidation tests were conducted. The experimental results indicated that the inclusion of CNC-W spirals increased the CBR value of clay up to the 15% mixture ratio, then decreased it. Similarly, the UCS value of clay was increased to the same ratio, whilst the UCS was not able to be determined due to the failing of all specimens with a mixture ratio higher than 15%. The permeability and swelling values, as well as the consolidation characteristics of the mixtures, were defined. The swelling percentages decreased from 1,15 cm/sec to 0,81 cm/sec with an increment in the CNC-W spiral content. A reduction was observed in the coefficient of permeability ( k ) values up to 15% mixture ratio, whilst it remained constant with change in CNC-W spiral content with a 20% mixture ratio. Coefficient of consolidation demonstrated a similar pattern of behavior to the permeability changes","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"122 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2020-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83952817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-26DOI: 10.15446/ing.investig.v39n3.81380
R. Castedo, C. Reifarth, Anastasio P. Santos, Jorge J Losada, L. M. López, M. Chiquito, J. Mancilla
La estimacion del error de discretizacion no siempre se calcula, aunque es algo fundamental para el estudio de la mecanica computacional de los solidos. Sin embargo, es bien sabido que el error cometido por la malla utilizada puede ser del mismo orden que la variable medida, lo que llega a invalidar los resultados obtenidos. El metodo del indice de convergencia de la malla (GCI) permite determinar sobre una base solida el orden de convergencia y la solucion asintotica, por lo que parece ser un buen estimador, a pesar de que es necesario seguir investigando en el contexto de las situaciones de ondas de choque (explosivos) y de los calculos de elementos finitos (FE). Para este fin, se realizaron pruebas de campo consistentes en la detonacion de una carga esferica colgada de explosivo casero. La presion generada por la onda de choque se midio en diferentes posiciones a dos distancias. Con estos datos, se obtuvo un equivalente de TNT que se utilizo para calcular la propagacion del choque con los programas LS-DYNA y ProsAir. Este trabajo pretende verificar el metodo GCI comparando sus resultados con los datos de campo junto con las simulaciones realizadas. Tambien, la comparacion busca validar la metodologia empleada para la obtencion del equivalente TNT. La investigacion muestra que el GCI da buenos resultados para ambos programas a pesar de la complejidad del problema fisico. Ademas, el LS-DYNA produce una mejor correlacion con los datos experimentales que los aportados por el ProsAir, con todos los valores por debajo del 10 % de error.
{"title":"Application of grid convergence index to shock wave validated with LS-DYNA and ProsAir","authors":"R. Castedo, C. Reifarth, Anastasio P. Santos, Jorge J Losada, L. M. López, M. Chiquito, J. Mancilla","doi":"10.15446/ing.investig.v39n3.81380","DOIUrl":"https://doi.org/10.15446/ing.investig.v39n3.81380","url":null,"abstract":"La estimacion del error de discretizacion no siempre se calcula, aunque es algo fundamental para el estudio de la mecanica computacional de los solidos. Sin embargo, es bien sabido que el error cometido por la malla utilizada puede ser del mismo orden que la variable medida, lo que llega a invalidar los resultados obtenidos. El metodo del indice de convergencia de la malla (GCI) permite determinar sobre una base solida el orden de convergencia y la solucion asintotica, por lo que parece ser un buen estimador, a pesar de que es necesario seguir investigando en el contexto de las situaciones de ondas de choque (explosivos) y de los calculos de elementos finitos (FE). Para este fin, se realizaron pruebas de campo consistentes en la detonacion de una carga esferica colgada de explosivo casero. La presion generada por la onda de choque se midio en diferentes posiciones a dos distancias. Con estos datos, se obtuvo un equivalente de TNT que se utilizo para calcular la propagacion del choque con los programas LS-DYNA y ProsAir. Este trabajo pretende verificar el metodo GCI comparando sus resultados con los datos de campo junto con las simulaciones realizadas. Tambien, la comparacion busca validar la metodologia empleada para la obtencion del equivalente TNT. La investigacion muestra que el GCI da buenos resultados para ambos programas a pesar de la complejidad del problema fisico. Ademas, el LS-DYNA produce una mejor correlacion con los datos experimentales que los aportados por el ProsAir, con todos los valores por debajo del 10 % de error.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"27 1","pages":"20-26"},"PeriodicalIF":0.0,"publicationDate":"2020-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73054386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-13DOI: 10.15446/ING.INVESTIG.V39N3.70221
Haaris Rasool, A. Rasool, A. Ikram, Urfa Rasool, Mohsin Jamil, Haaziq Rasool
This work aims to tune multiple controllers at the same time for a HVDC system by using a self-generated (SG) simulation-based optimization technique. Online optimization is a powerful tool to improve performance of the system. Proportion integral (PI) controllers of Multi-infeed HVDC systems are optimized by the evaluation of objective functions in time simulation design (TSD). Model based simulation setup is applied for rapid selection of optimal PI control parameters, designed in PSCAD software. A multiple objective function (OF), i.e. Integral absolute error (IAE), integral square error (ISE), integral time absolute error (ITAE), integral time square error (ITSE), and integral square time error (ISTE), is assembled for testing the compatibility of OFs with nonlinear self-generated simplex algorithm (SS-SA). Improved control parameters are achieved after multiple iterations. All OFs generate optimum responses and their results are compared with each other by their minimized numerical values. Disturbance rejection criteria are also proposed to assess the designed controller performance along with robustness of system. Results are displayed in form of graphs and tables in this paper.
{"title":"Compatibility of objective functions with simplex algorithm for controller tuning of HVDC system","authors":"Haaris Rasool, A. Rasool, A. Ikram, Urfa Rasool, Mohsin Jamil, Haaziq Rasool","doi":"10.15446/ING.INVESTIG.V39N3.70221","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V39N3.70221","url":null,"abstract":"This work aims to tune multiple controllers at the same time for a HVDC system by using a self-generated (SG) simulation-based optimization technique. Online optimization is a powerful tool to improve performance of the system. Proportion integral (PI) controllers of Multi-infeed HVDC systems are optimized by the evaluation of objective functions in time simulation design (TSD). Model based simulation setup is applied for rapid selection of optimal PI control parameters, designed in PSCAD software. A multiple objective function (OF), i.e. Integral absolute error (IAE), integral square error (ISE), integral time absolute error (ITAE), integral time square error (ITSE), and integral square time error (ISTE), is assembled for testing the compatibility of OFs with nonlinear self-generated simplex algorithm (SS-SA). Improved control parameters are achieved after multiple iterations. All OFs generate optimum responses and their results are compared with each other by their minimized numerical values. Disturbance rejection criteria are also proposed to assess the designed controller performance along with robustness of system. Results are displayed in form of graphs and tables in this paper.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"78 1","pages":"34-43"},"PeriodicalIF":0.0,"publicationDate":"2020-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76837858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-12DOI: 10.15446/ING.INVESTIG.V39N3.77175
Feizar Javier Rueda-Velasco, W. Adarme-Jaimes, Angélica Garzón-Luna, Jhonatan Marroquín-Ávila, Gabriel Parada-Caro
The evaluation of the strategic supply chain configuration is considered one of the strategic logistics decisions, especially in food assistance supply chains focused on generating better nutritional conditions in vulnerable populations. In Colombia, there is a social program called Bienestarina, which aims to promote food and nutritional security in a vulnerable population. Although the government supports the program for improving nutritional support, there are currently inconsistencies in freight flows, lack of coverage in some areas, and delivery delays. Therefore, this work aims to evaluate the current configuration of the supply chain and propose improvements related to the facility location. Such advances would enable the increase in the efficacy of the network and the reduction of malnutrition in the country. For this purpose, a mixed-integer mathematical programming model is presented, which considers the weighted distance criterion for different demand scenarios and supports the location-allocation decision in a social assistance supply chain. The current network configuration was compared with the optimal proposed structure. The comparisons show highly potential improvements in freight flow allocation, suggests several variations in the existing warehouses emplacement, and generates public policy implications to reduce the logistic cost in the system, prioritizing in turn the demand covering.
{"title":"Evaluation of a facility location for a food assistance supply chain. The case of Bienestarina in Colombia","authors":"Feizar Javier Rueda-Velasco, W. Adarme-Jaimes, Angélica Garzón-Luna, Jhonatan Marroquín-Ávila, Gabriel Parada-Caro","doi":"10.15446/ING.INVESTIG.V39N3.77175","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V39N3.77175","url":null,"abstract":"The evaluation of the strategic supply chain configuration is considered one of the strategic logistics decisions, especially in food assistance supply chains focused on generating better nutritional conditions in vulnerable populations. In Colombia, there is a social program called Bienestarina, which aims to promote food and nutritional security in a vulnerable population. Although the government supports the program for improving nutritional support, there are currently inconsistencies in freight flows, lack of coverage in some areas, and delivery delays. Therefore, this work aims to evaluate the current configuration of the supply chain and propose improvements related to the facility location. Such advances would enable the increase in the efficacy of the network and the reduction of malnutrition in the country. For this purpose, a mixed-integer mathematical programming model is presented, which considers the weighted distance criterion for different demand scenarios and supports the location-allocation decision in a social assistance supply chain. The current network configuration was compared with the optimal proposed structure. The comparisons show highly potential improvements in freight flow allocation, suggests several variations in the existing warehouses emplacement, and generates public policy implications to reduce the logistic cost in the system, prioritizing in turn the demand covering.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"15 1","pages":"50-61"},"PeriodicalIF":0.0,"publicationDate":"2020-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85884566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15446/ING.INVESTIG.V40N1.76048
Marta Royo González, E. Mulet, V. Chulvi, J. Galán
The aim of adaptable design is to create products that can easily adapt to different needs. The objective if this study is to analyze the effectivenes in communication to promote an adaptable baby stroller, in order to know the user perception of the advantages derived from its adaptability, as well as the environmental ones, and if there is correlation between them. It is also intended to determine whether age or previous experience with this type of product can influence this perception. To this effect, a study with 54 participants has been conducted. Results show that users percieve the advantages and find the adaptable design interesting. Valuation of the advantages of the product is affected by previous user experience with the need for adaptability. Valuation of the environmental benefits is independent from the degree of experiense, as well as from the age of the participants (between 30 and 45 years old).
{"title":"Surveying the Perception of the Environmental Advantages of an Adaptable Product","authors":"Marta Royo González, E. Mulet, V. Chulvi, J. Galán","doi":"10.15446/ING.INVESTIG.V40N1.76048","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V40N1.76048","url":null,"abstract":"The aim of adaptable design is to create products that can easily adapt to different needs. The objective if this study is to analyze the effectivenes in communication to promote an adaptable baby stroller, in order to know the user perception of the advantages derived from its adaptability, as well as the environmental ones, and if there is correlation between them. It is also intended to determine whether age or previous experience with this type of product can influence this perception. To this effect, a study with 54 participants has been conducted. Results show that users percieve the advantages and find the adaptable design interesting. Valuation of the advantages of the product is affected by previous user experience with the need for adaptability. Valuation of the environmental benefits is independent from the degree of experiense, as well as from the age of the participants (between 30 and 45 years old).","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"48 1","pages":"50-59"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79363672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15446/ING.INVESTIG.V40N1.79634
T. Sánchez-Almeida, I. Sandoval-Palis, Raquel Gilar-Corbí, Juan L. Castejón-Costa, Diego Israel Salazar-Orellana
Este trabajo valida un instrumento de evaluacion docente aplicado a profesores de las carreras de ingenieria, ciencias y de nivel tecnologico superior de la Escuela Politecnica Nacional, utilizando el metodo de Analisis Factorial con extraccion de componentes principales. La base de datos utilizada en la investigacion fue examinada previamente y refinada por inconsistencia - por ejemplo, valores atipicos, valores fuera de rango, etc. El resultado del metodo descrito anteriormente fue una encuesta reducida de 15 items, que se obtuvo de un estudio original de 33 items. Este nuevo cuestionario identifica claramente las cuatro dimensiones o aspectos: planificacion y desarrollo de la docencia; relacion profesor-alumno; evaluacion; y una pregunta de valoracion global. La reduccion de la escala de evaluacion permitira mejorar el proceso de la evaluacion integral del desempeno docente del personal de la Escuela Politecnica Nacional, y este metodo podria servir de referencia para el proceso de evaluacion de la ensenanza de otras universidades que pertenecen al sistema de educacion superior del Ecuador.
{"title":"Teaching Evaluation Questionnaire Validation at Escuela Politécnica Nacional, Applying the Method of Factor Analysis with Extraction of Principal Components","authors":"T. Sánchez-Almeida, I. Sandoval-Palis, Raquel Gilar-Corbí, Juan L. Castejón-Costa, Diego Israel Salazar-Orellana","doi":"10.15446/ING.INVESTIG.V40N1.79634","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V40N1.79634","url":null,"abstract":"Este trabajo valida un instrumento de evaluacion docente aplicado a profesores de las carreras de ingenieria, ciencias y de nivel tecnologico superior de la Escuela Politecnica Nacional, utilizando el metodo de Analisis Factorial con extraccion de componentes principales. La base de datos utilizada en la investigacion fue examinada previamente y refinada por inconsistencia - por ejemplo, valores atipicos, valores fuera de rango, etc. El resultado del metodo descrito anteriormente fue una encuesta reducida de 15 items, que se obtuvo de un estudio original de 33 items. Este nuevo cuestionario identifica claramente las cuatro dimensiones o aspectos: planificacion y desarrollo de la docencia; relacion profesor-alumno; evaluacion; y una pregunta de valoracion global. La reduccion de la escala de evaluacion permitira mejorar el proceso de la evaluacion integral del desempeno docente del personal de la Escuela Politecnica Nacional, y este metodo podria servir de referencia para el proceso de evaluacion de la ensenanza de otras universidades que pertenecen al sistema de educacion superior del Ecuador.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"25 1","pages":"70-77"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90103778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15446/ING.INVESTIG.V40N1.77718
D. Valencia-Hernandez, Sebastián Robledo, R. Pinilla, N. Duque-Méndez, G. Olivar-Tost
Tree of Science (ToS) is a web-based tool which uses the network structure of paper citation to identify relevant literature. ToS shows the information in the form of a tree, where the articles located in the roots are the classics, in the trunk are the structural publications, and leaves are the most current papers. It has been found that some results in the leaves can be separated from the tree. Therefore, an algorithm (SAP) is proposed, in order to improve results in the leaves. Two improvements are presented: articles located in the leaves are from the last five years, and they are connected to root and trunk articles through their citations. This improvement facilitates construction of current literature for researchers.
{"title":"SAP Algorithm for Citation Analysis: An improvement to Tree of Science","authors":"D. Valencia-Hernandez, Sebastián Robledo, R. Pinilla, N. Duque-Méndez, G. Olivar-Tost","doi":"10.15446/ING.INVESTIG.V40N1.77718","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V40N1.77718","url":null,"abstract":"Tree of Science (ToS) is a web-based tool which uses the network structure of paper citation to identify relevant literature. ToS shows the information in the form of a tree, where the articles located in the roots are the classics, in the trunk are the structural publications, and leaves are the most current papers. It has been found that some results in the leaves can be separated from the tree. Therefore, an algorithm (SAP) is proposed, in order to improve results in the leaves. Two improvements are presented: articles located in the leaves are from the last five years, and they are connected to root and trunk articles through their citations. This improvement facilitates construction of current literature for researchers.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"49 1","pages":"45-49"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84624609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15446/ING.INVESTIG.V40N1.78822
G. Platt, Marcelo E. Aragão, Fernanda Cabral Borges, Douglas A. Goulart
Los problemas de optimizacion multimodal se encuentran comunmente en problemas de ingenieria y su solucion puede ser muy desafiante para los enfoques metaheuristicos. En este trabajo se analizo el uso de un metodo metaheuristico multimodal recientemente propuesto - el Algoritmo Multimodal de Polinizacion de la Flor - en problemas de equilibrio de fase fluida en dos etapas: (i) el calculo de azeotropos dobles y (ii) la estimacion de parametros en un modelo termodinamico. Tambien se consideran dos formulaciones diferentes en el problema de doble azeotropia. En el calculo de azeotropo, se realizo un analisis estadistico para verificar si el desempeno del algoritmo se ve afectado por la formulacion del problema. Los resultados computacionales indican que la metodologia proporciona resultados robustos y que la funcion objetivo empleada afecta el rendimiento computacional.
{"title":"Evaluation of a New Multimodal Optimization Algorithm in Fluid Phase Equilibrium Problems","authors":"G. Platt, Marcelo E. Aragão, Fernanda Cabral Borges, Douglas A. Goulart","doi":"10.15446/ING.INVESTIG.V40N1.78822","DOIUrl":"https://doi.org/10.15446/ING.INVESTIG.V40N1.78822","url":null,"abstract":"Los problemas de optimizacion multimodal se encuentran comunmente en problemas de ingenieria y su solucion puede ser muy desafiante para los enfoques metaheuristicos. En este trabajo se analizo el uso de un metodo metaheuristico multimodal recientemente propuesto - el Algoritmo Multimodal de Polinizacion de la Flor - en problemas de equilibrio de fase fluida en dos etapas: (i) el calculo de azeotropos dobles y (ii) la estimacion de parametros en un modelo termodinamico. Tambien se consideran dos formulaciones diferentes en el problema de doble azeotropia. En el calculo de azeotropo, se realizo un analisis estadistico para verificar si el desempeno del algoritmo se ve afectado por la formulacion del problema. Los resultados computacionales indican que la metodologia proporciona resultados robustos y que la funcion objetivo empleada afecta el rendimiento computacional.","PeriodicalId":21285,"journal":{"name":"Revista Ingenieria E Investigacion","volume":"37 1","pages":"27-33"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80610811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：