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1
artículo
Publicado 2019
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Decision making in mining is a complicated process. Decisions regarding the sizing and allocation of the fleet of trucks to different mines, considering the compliance with production and the total objective cost, are of paramount importance to mining companies as this directly affects their profits. This document presents a model of goal programming (based on linear programming) to optimize mining operations in underground mining taking into account three goals: (a) To minimize deviations from the target production of different minerals, (b) to minimize the surplus of the total designated operating cost and (c) to maximize the use of concentrator plants’ maximum capacity. The model determines the number of trucks needed and provides the optimal allocation to each mine while addressing the goals and limitations of the mining operation. The proposed model was validated using real data f...
2
artículo
Publicado 2019
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Decision making in mining is a complicated process. Decisions regarding the sizing and allocation of the fleet of trucks to different mines, considering the compliance with production and the total objective cost, are of paramount importance to mining companies as this directly affects their profits. This document presents a model of goal programming (based on linear programming) to optimize mining operations in underground mining taking into account three goals: (a) To minimize deviations from the target production of different minerals, (b) to minimize the surplus of the total designated operating cost and (c) to maximize the use of concentrator plants’ maximum capacity. The model determines the number of trucks needed and provides the optimal allocation to each mine while addressing the goals and limitations of the mining operation. The proposed model was validated using real data f...
3
artículo
Publicado 2019
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A network is an acyclic directed graph in which there are sources that have some messages and want to transmit to receivers through the combination of messages in intermediate nodes. The goal is to find a collection of functions that allow to combine messages in order to satisfy the demand of the receivers. In this paper, we study the fractional solvability problem of a network using an extension of the solvability problem in closure operators given by Gadouleau in 2013. We define linear programming problems via the desired extension in order to study capacities; using some information inequalities and characteristic-dependent linear rank inequalities, we obtain upper bounds on linear capacity of some networks and closure operators over some fields.
4
artículo
Publicado 2019
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A network is an acyclic directed graph in which there are sources that have some messages and want to transmit to receivers through the combination of messages in intermediate nodes. The goal is to find a collection of functions that allow to combine messages in order to satisfy the demand of the receivers. In this paper, we study the fractional solvability problem of a network using an extension of the solvability problem in closure operators given by Gadouleau in 2013. We define linear programming problems via the desired extension in order to study capacities; using some information inequalities and characteristic-dependent linear rank inequalities, we obtain upper bounds on linear capacity of some networks and closure operators over some fields.
5
artículo
Publicado 2016
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This study develops a planning approach to enable interprovincial land-transport companies to maintain an efficient travel schedule, considering the availability of their medium and long-term resources and the application of revenue management to obtain higher incomes through the use of information technologies. The development of a decision-support system in this sector will allow travel schedule focuses for optimizing the total marginal contribution in the long term, i.e. the difference between incomes and variable costs, as well as an appropriate allocation of resources to the trips, and that the fares established are adequate for the company to reach its goals.
6
artículo
Publicado 2016
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This study develops a planning approach to enable interprovincial land-transport companies to maintain an efficient travel schedule, considering the availability of their medium and long-term resources and the application of revenue management to obtain higher incomes through the use of information technologies. The development of a decision-support system in this sector will allow travel schedule focuses for optimizing the total marginal contribution in the long term, i.e. the difference between incomes and variable costs, as well as an appropriate allocation of resources to the trips, and that the fares established are adequate for the company to reach its goals.
7
tesis de grado
Publicado 2021
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La toma de decisiones en la minería es un proceso complicado. Las decisiones con respecto al dimensionamiento y a la asignación de la flota de camiones a diferentes minas, en consideración con el cumplimiento de la producción y del costo total objetivo, son de suma importancia para las empresas mineras, ya que esto afecta directamente las utilidades que pueden obtener. Este documento presenta un modelo de programación por objetivos (con base en la programación lineal) para optimizar las operaciones mineras de extracción en minas socavón, tomando en consideración tres objetivos: (a) Minimizar las desviaciones de la producción objetivo de diferentes minerales, (b) minimizar el excedente del costo operativo total designado y (c) maximizar el uso de la capacidad máxima de las plantas concentradores. El modelo determina la cantidad de camiones necesarios y proporciona la asignació...
8
artículo
Publicado 2018
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Nanotechnology offers tools for the design of automated sensors capable of neutralizing toxic agents through the development of logical operations and communication of information. The use of molecular components in the manufacture of nanosensors is advantageous because of the high capacity of information transmission, efficiency and speed of operations. The goal is to develop intelligent nanosensors using logical operators based on the molecular electrostatic potential interactions and the transport of information through vibrational signals. The current work shows preliminary results based on basic principles of matter, such as quantum mechanics, molecular mechanics and molecular dynamics.The cascades of molecular gates would operate through signals based on molecular electrostatic potential. These logical gate arrays will allow us to perform all kind of mathematical functions. The pos...
9
tesis de maestría
Publicado 2005
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La planificación de las operaciones involucradas en un proyecto de desarrollo de software ha sido un problema a superar, desde el auge del uso de metodologías que guían dicho proceso. Tanto la eficiencia como la sofisticación de los algoritmos que buscan resolver los estos ordenamientos, han ido evolucionando durante la segunda mitad del siglo XX. Al mencionado problema de ordenar tareas con dependencias se le conoce en la algorítmica como programación de tareas o task scheduling y es definido de la siguiente forma: dado un conjunto de tareas a ser programadas en determinado grupo de máquinas (o recursos hombre-máquina como podrían ser programadores, analistas, etc.), encontrar un orden adecuado de ejecución. Es un problema de complejidad NP-difícil por lo que se justifica el uso de métodos heurísticos para obtener soluciones aproximadas. El presente trabajo de tesis present...
10
tesis de grado
Publicado 2020
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The objective of this Thesis is to carry out a “Feasibility Analysis to maintain the economic profitability of the Specialized Contract JRC Ingeniería y Construcción SAC in Minera del Sur. The specialized mining contract JRC Ingeniería y Construcción SAC is in charge of carrying out the preparation of Levels, Cruises, Bypass, Ramps, Galleries from level 4890 to level 4340 with the aim that the company subsequently enters to exploit its pit by the method Bench & Fill. All operations are carried out entirely mechanized. The Southern Mining Unit and the JRC Engineering and Construction Specialized Contract have a contract, which the monthly physical goal for linear advance is 1500 linear meters linear meters per month. Due to calculation problems of proven and probable reserves, they were forced to reduce from 1,500 meters programmed monthly to 500 linear meters monthly, which the JRC...
11
tesis de grado
El análisis envolvente de datos (Data Envelopment Analysis), desarrollado por A. Charnes, W Cooper y E. Rhodes, es un método no paramétrico, basado en programación lineal y benchmarking, para medir la productividad y la eficiencia relativa de unidades de organización. El objetivo fundamental de DEA es hallar una frontera de eficiencia, formada por aquellas combinaciones de recursos que optimizan la cantidad de productos fabricados minimizando los costos de producción, y a partir de esta frontera, evaluar la eficiencia relativa de las combinaciones de recursos que no pertenezcan a la misma. En este trabajo se mostrará la eficiencia de la Seguridad Ciudadana de los distintos distritos de Lima Metropolitana utilizando DEA donde se utilizo el programa Frontier Analyst para el análisis correspondiente.
12
tesis de maestría
Publicado 2020
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Descargue el texto completo en el repositorio institucional de la Universidade Estadual de Campinas: https://hdl.handle.net/20.500.12733/1641108
13
tesis de grado
Publicado 2007
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Esta tesis trabaja en el desarrollo de un Control adaptivo de un motor paralelo empleando linealización por realimentación. Debido al conocimiento impreciso de los parámetros del motor, un enfoque adaptable agrega robustez a la técnica de linealización entrada-salida que requiere la exacta cancelación de los términos no lineales. El objetivo del control es seguir una velocidad de referencia aún cuando se tenga parámetros desconocidos y perturbaciones de carga. La estabilidad de la dinámica interna es asegurada por el análisis de la dinámica de ceros. Se ha desarrollado también un observador no lineal para el torque de carga con dinámica de error lineal. Las simulaciones se efectuaron usando el programa de simulación SIMULINKTM desde MATLABTM. El desempeño del controlador adaptivo se ha probado en tiempo real usando una configuración experimental. Se presenta una metodolo...
14
artículo
Publicado 2024
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Introduction: The adoption of efficient study habits is of great importance to achieve academic success in an increasingly demanding educational landscape. Objective: The relationship between study habits and academic performance among university students has been investigated. Method: The behavior of students regarding on-line tests has been taken as an indicator of study habits. From a stratified sampling, a random sample composed of 160 students enrolled in two first-year groups of the Degree in Business Administration and Management (ADE) at the University of Malaga has been obtained. Several quantitative analysis techniques are applied: descriptive and inferential analysis based on the estimation of non linear and linear regression models. Results: The results obtained suggest that students who delay the time to answer these tests obtain worse grades in these tests and in future exa...
15
artículo
Publicado 2024
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Introduction: The adoption of efficient study habits is of great importance to achieve academic success in an increasingly demanding educational landscape. Objective: The relationship between study habits and academic performance among university students has been investigated. Method: The behavior of students regarding on-line tests has been taken as an indicator of study habits. From a stratified sampling, a random sample composed of 160 students enrolled in two first-year groups of the Degree in Business Administration and Management (ADE) at the University of Malaga has been obtained. Several quantitative analysis techniques are applied: descriptive and inferential analysis based on the estimation of non linear and linear regression models. Results: The results obtained suggest that students who delay the time to answer these tests obtain worse grades in these tests and in future exa...
16
artículo
Publicado 2025
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This research analyzes the relationship between the use of precision technologies and the management of agricultural inputs within the framework of sustainability. Structured surveys were conducted with 120 producers, addressing variables such as access to technology, training, technological integration, productivity, and barriers. Multiple linear regression, Spearman correlation, and cluster analysis were applied to identify the factors influencing efficient, environmentally responsible, and socioeconomically viable input management. The findings show that the Productivity and Sustainability dimension has a significant positive effect, while barriers and challenges have a negative influence. The model related to soil health (adjusted R² = 0.304) highlights the potential of precision technologies to enhance yield and reduce environmental impacts. However, structural limitations, such as...
