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1
artículo
Publicado 2013
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The plant layout problem can be generalized as a case intensively studied combinatorial optimization and therefore its nature is a NP- hard. The core of the problem originally introduced as the Systematic Distribution Planning , a multi -criteria and relatively simple, has been extended to larger contexts , through the formulation as a mathematical model based on the nature of the workshops . Given the computational complexity of the calculations have been developed heuristics ,metaheuristics and others to obtain approximate solutions . The aim of this study is to analyze recent research on plant distribution problems within the industrial context by classifying and comparing the representation of the problem , solution methods , constraints and the objective function used . The report covers more than 30 peer-reviewed articles on the subject. Particular attention is placed on recent pub...
2
artículo
Publicado 2020
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DOI: https://doi.org/10.26439/ing.ind2020.n038.4814 The multivariate process capability analysis includes many indices that are only used when the data is normal and others, when the data is not normal. The same occurs with correlated and uncorrelated quality variables. In this research work, a CPME multivariate capability index was developed by initially using a univariate index—depending on whether the data was o not normal—and any correlation between variables, and then through a characteristic function for the multivariate data. This index may be used in all the aforementioned cases. Some examples of this alternative are presented on a set of real and simulated data, where a broad performance of our proposed index was found against other similar capability indices.
3
artículo
Publicado 2020
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DOI: https://doi.org/10.26439/ing.ind2020.n038.4814 The multivariate process capability analysis includes many indices that are only used when the data is normal and others, when the data is not normal. The same occurs with correlated and uncorrelated quality variables. In this research work, a CPME multivariate capability index was developed by initially using a univariate index—depending on whether the data was o not normal—and any correlation between variables, and then through a characteristic function for the multivariate data. This index may be used in all the aforementioned cases. Some examples of this alternative are presented on a set of real and simulated data, where a broad performance of our proposed index was found against other similar capability indices.
4
artículo
Publicado 2013
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The application of different unit root statistics is by now a standard practice in empirical work. Even when it is a practical issue, these statistics have complex nonstandard distributions depending on functionals of certain stochastic processes, and their derivations represent a barrier even for many theoretical econometricians. These derivations are based on rigorous and fundamental statistical tools which are not (very) well known by standard econometricians. This paper aims to fill this gap by explaining in a simple way one of these fundamental tools: namely, the Functional Central Limit Theorem. To this end, this paper analyzes the foundations and applicability of two versions of the Functional Central Limit Theorem within the framework of a unit root with a structural break. Initial attention is focused on the probabilistic structure of the time series to be considered. Thereafter...
5
informe técnico
Publicado 2021
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The liquid product obtained from tire pyrolysis process, called tire pyrolysis oil (TPO), has a great attraction as an alternative fuel, as it has a viscosity of 5.43 cSt (Sharma et al., 2016), density of 921 kg/m³ (Gamboa et al., 2020), surface tension of 0.028 N/m (Chumpitaz et al., 2019), and higher heating value of 46.32 MJ/kg (Das et al., 2017), which are similar to diesel oil. These physical and chemical properties have motivated research into its application in furnaces, boilers and compression ignition engines. Generally, TPO is blended with diesel or biodiesel in order to decrease the percentage of sulfur and improve the cetane number of the fuel blend (Sharma et al., 2016). However, the evaluation of the quality and applicability of TPO has been focused mainly on combustion emissions and the performance of thermal equipment fueled with this fuel (and diesel/biodiesel blends), ...
6
informe técnico
Publicado 2021
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The liquid product obtained from tire pyrolysis process, called tire pyrolysis oil (TPO), has a great attraction as an alternative fuel, as it has a viscosity of 5.43 cSt (Sharma et al., 2016), density of 921 kg/m³ (Gamboa et al., 2020), surface tension of 0.028 N/m (Chumpitaz et al., 2019), and higher heating value of 46.32 MJ/kg (Das et al., 2017), which are similar to diesel oil. These physical and chemical properties have motivated research into its application in furnaces, boilers and compression ignition engines. Generally, TPO is blended with diesel or biodiesel in order to decrease the percentage of sulfur and improve the cetane number of the fuel blend (Sharma et al., 2016). However, the evaluation of the quality and applicability of TPO has been focused mainly on combustion emissions and the performance of thermal equipment fueled with this fuel (and diesel/biodiesel blends), ...
7
artículo
Publicado 2024
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Diversos autores ponen de manifiesto que, para poder realizar una adecuada gestión sostenible de los ecosistemas forestales, es de vital importancia tener la capacidad de conocer la estructura espacial de los bosques y las modificaciones que le puede ocasionar debido al aprovechamiento forestal para gestionar de manera sostenible los ecosistemas forestales. Los objetivos de este estudio fueron examinar y caracterizar el patrón espacial del tornillo (Cedrelinga cateniformis (Ducke) Ducke) y guabilla (Inga thibaudiana DC.), así como analizar su relación con la altitud (m) sobre el nivel del mar, la distancia (m) de los árboles aprovechables hasta un río y la distancia (m) de los árboles aprovechables hasta un árbol semillero. El análisis estadístico se realizó a través de las herramientas del análisis de patrones puntuales espaciales, que proveen un conjunto de métodos para e...
8
artículo
Mathematical modelling applied to batch milling (at experimental level), is a very important tool to simulate and predict the granulometric yield of a given treated ore; this means, for a given duration of milling operation, to obtain an estimate of the corresponding granulometric analysis, which can then be tested with real data later on, to verify the estimates. The model involves the selection and fracture functions depending on each mesh size in the ore distribution. This will allow the prediction of effective and reliable results, saving costs and more importantly, time, without the need to perform the milling process for each prediction of batch milling.
9
artículo
Mathematical modelling applied to batch milling (at experimental level), is a very important tool to simulate and predict the granulometric yield of a given treated ore; this means, for a given duration of milling operation, to obtain an estimate of the corresponding granulometric analysis, which can then be tested with real data later on, to verify the estimates. The model involves the selection and fracture functions depending on each mesh size in the ore distribution. This will allow the prediction of effective and reliable results, saving costs and more importantly, time, without the need to perform the milling process for each prediction of batch milling.
10
tesis de maestría
Publicado 2020
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The presented work demonstrates the process of designing a cheap, low cost three axis force sensor. Further it describes its integration in an array of multiple sensors to measure the distribution of forces acting on the sole of a prosthetic foot. The focus will be on easy manufacturing and common materials since the sensor will be integrated in a low cost prosthesis for lower limp amputees. Using the knowledge from bio mechanics and some basic assumptions for the later use, requirements for the project are derived. After a presentation of some state of the art sensor principles, suitable concepts are collected. Than, the concepts are compared using a comparison table to find the one the fits the requirements the best. A very compelling concept using barometers casted in silicone rubber is tested using a simple prototype to try out whether it is a good candidate or not. The tests show th...
11
tesis de maestría
Publicado 2020
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The presented work demonstrates the process of designing a cheap, low cost three axis force sensor. Further it describes its integration in an array of multiple sensors to measure the distribution of forces acting on the sole of a prosthetic foot. The focus will be on easy manufacturing and common materials since the sensor will be integrated in a low cost prosthesis for lower limp amputees. Using the knowledge from bio mechanics and some basic assumptions for the later use, requirements for the project are derived. After a presentation of some state of the art sensor principles, suitable concepts are collected. Than, the concepts are compared using a comparison table to find the one the fits the requirements the best. A very compelling concept using barometers casted in silicone rubber is tested using a simple prototype to try out whether it is a good candidate or not. The tests show th...
12
artículo
Publicado 2024
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This paper introduces an innovative approach to address the distribution network reconfiguration (DNR) challenge, aiming to reduce power loss through an advanced hyperbolic tangent particle swarm optimization (HT-PSO) method. This approach is distinguished by the adoption of a novel hyperbolic tangent function, which effectively limits the rate of change values, offering a significant improvement over traditional sigmoid function-based methods. A key feature of this new approach is the integration of a tunable parameter, δ, into the HT-PSO, enhancing the curve’s adaptability. The careful optimization of δ ensures superior control over the rate of change across the entire operational range. This enhanced control mechanism substantially improves the efficiency of the search and convergence processes in DNR. Comparative simulations conducted on 33- and 94-bus systems show an improvement...
13
artículo
While it is true that vaccines generate immunity with a high degree of effectiveness and that in Peru, a certain time was spent initiating the COVID-19 disease, a vaccination process that was developed logistically. The objective was to obtain the mathematical model of the COVID-19 vaccination process in Peru, to estimate the number of people vaccinated, the critical time for which the estimated rate of vaccinated people has been the highest value, and to specify the date on which the highest number of people vaccinated has occurred. The methodology was based on determining the form of dispersion of the vaccination process, this being a logistic distribution and considering that a mathematical model is a mathematical description, by means of a function of a real-world phenomenon, such as the number of people vaccinated against the COVID-19 disease. The model presented a correlation coeff...
14
artículo
Publicado 2022
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The real-time prediction and estimation of the spread of diseases, such as COVID-19 is of paramount importance as evidenced by the recent pandemic. This work is concerned with the distributed parameter estimation of the time–space propagation of such diseases using a diffusion–reaction epidemiological model of the susceptible–exposed–infected–recovered (SEIR) type. State estimation is based on continuous measurements of the number of infections and deaths per unit of time and of the host spatial domain. The observer design method is based on positive definite matrices to parameterize a class of Lyapunov functionals, in order to stabilize the estimation error dynamics. Thus, the stability conditions can be expressed as a set of matrix inequality constraints which can be solved numerically using sum of squares (SOS) and standard semi-definite programming (SDP) tools. The observer...
15
artículo
The 2016 Ecuador earthquake (Mw 7.8), is part of the sequence of large earthquakes in Ecuador and Colombia: 1906 (8.4 to 8.8 Mw), 1942 (Mw 7.8), 1958 (Mw 7.7), 1979 (Mw 8.2), all these events with a focal mechanism of the thrust fault type. In this research, we have obtain the seismic source distribution (indicating the presence of 2 main asperities), from inversion of teleseismic signals, as well as the parameters of the seismic rupture process: focal mechanism that indicates a type of inverse fault (strike = 25°, dip = 12°, rake = 118°) for a focal depth of 23 km and the source time function indicating a composite event, the duration of the rupture process was around 70 s, assuming an average rupture velocity of 3.0 km/s. The seismic moment was calculated at 5.74x10{20} Nm, equivalent to a magnitude of Mw 7.8. The smallest asperity is located around the epicenter and the main asperi...
16
artículo
Publicado 2019
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Introduction. Collaborative work promotes learning through active participation of students, allowing the development of social abilities and the construction of their own knowledge. Objective. To analyze collaborative work and its relationship with academic performance in medical students in a research course. Methods. Cross-sectional study, in which 148 human medicine students enrolled in the research course participated, selected using a non-probabilistic sample. The questionnaire called analysis of cooperative work in higher education that assesses the importance of collaborative work, of 49 questions distributed in seven dimensions, was used. A Likert scale was used in a range of 1 to 5, where 1 is valued as a total disagreement and 5 totally agree. Three groups were established: low group to 33 percentile; middle group, from 34th percentile to 66t...
17
tesis de grado
Publicado 2021
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El trabajo presenta el caso de una distribuidora de productos de consumo masivo en la ciudad de Ayacucho, la cual comercializa sus productos en las provincias de Huamanga, Huanta, Cangallo, Víctor Fajardo, Vilcashuamán, además de otras provincias de la selva ayacuchana. En los capítulos I, II y III se describe los antecedentes, objetivos y plan estratégico de la empresa. Se muestra el análisis interno y externo utilizando herramientas como la cadena de valor, 5 fuerzas de Porter, análisis PESTEL, entre otros. Se describe el funcionamiento de los procesos principales los cuales son picking, toma y entrega de pedidos. En el capítulo IV se realiza el cálculo de la capacidad instalada, para lo cual se tuvo en cuenta las dimensiones del almacén, mostradas con mayor detalle en el capítulo V. El capítulo VI describe la gestión de calidad de la empresa la cual se realiza al momento ...
18
tesis de grado
Publicado 2019
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El concepto de la logística abarca una serie de funciones que van desde la obtención de bienes y servicios, su almacenaje, hasta su distribución al consumidor final. Estas distintas actividades deben integrarse viendo el almacenamiento como un proceso y no como una función, a fin de poder operar con eficiencia. El proceso de la función logística encargada de la recepción, almacenamiento y movimiento de cualquier material se denomina gestión de almacenamiento, el cual indica dónde y cómo deben ser almacenados los materiales, algunos de los beneficios que genera una correcta gestión son la reducción de los costos de almacén y mejoras en el servicio al cliente mediante la aceleración del proceso de gestión de pedidos.
19
artículo
Publicado 2016
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Glomerular filtration rate (GFR) is calculated by the endogenous creatinine clearance (DCE) in 24-hour urine, with limited collection and difficulties for patients. There are formulas proposed to estimate renal function. Objective. To use the Cockcroft-Gaul formula of glomerular filtration and to compare it with the chemical colorimetric method in pregnant women. Design. Observational, correlational, prospective and transversal study. Setting. Central Laboratory, Sergio Bernales National Hospital, Lima, Peru. Participants. Pregnant women. Methods. Using prior informed consent blood samples and 24-hour urine of 92 pregnant women between November 2015 and January 2016 were processed. The Pearson correlation coefficient was used to compare the DCE results obtained with the Cockcroft- Gault formula and the serum-24 hours urine. Results. The sample had a normal distribution analyzed by Kolmog...
20
tesis de grado
Publicado 2023
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El propósito de este trabajo es modernizar los documentos gubernamentales que rigen la administración del departamento de recursos humanos en Municipalidad de San Juan de Lurigancho Lima Perú, con el fin de lograr la eficiencia en la gestión del área. Bajo este objetivo se analizarán antecedentes, sobre la base de la problemática planteada, así como la realización de entrevistas y encuestas para determinar las posibles alternativas que darán solución a la problemática, eligiendo la más idónea que cumpla con las mejores necesidades de la municipalidad y la optimización de los recursos necesarios para la efectividad de la administración pública del área de los recursos humanos. Se concluye así que la necesidad de levantar información, reconocer los procesos y realizar la actualización de los instrumentos públicos de administración tales son el MOF, ROF y CAP son nece...
