Computación en paralelo para el proceso de laminación con un tratamiento numérico del problema de LQR

The considerable increase in computation of the optimal control problems has in many cases overflowed the computing capacity available to handle complex systems in real time. For this reason, alternatives such as parallel computing are studied in this article, where the problem is worked out by distributing the tasks among several processors in order to accelerate the computation and to analyze and investigate the reduction of the total time of calculation the incremental gradually the processors used in it. We explore the use of these methods with a case study represented in a rolling mill process, and in turn making use of the strategy of updating the Phase Finals values for the construction of the final penalty matrix for the solution of the differential Riccati Equation. In addition, the order of the problem studied is increasing gradually for compare the improvements achieved in the models with major dimension. Parallel computing alternatives are also studied through multiple processing elements within a single machine or in a cluster via OpenMP, which is an application programming interface (API) that allows the creation of shared memory programs

Response of exact solutions of the nonlinear Schrodinger equation to small perturbations in a class of complex external potentials having supersymmetry and parity-time symmetry

We discuss the effect of small perturbation on nodeless solutions of the nonlinear \Schrodinger\ equation in 1+1 dimensions in an external complex potential derivable from a parity-time symmetric superpotential that was considered earlier [Phys.~Rev.~E 92, 042901 (2015)]. In particular we consider the nonlinear partial differential equation \{ \, \rmi \, \partial_t + \partial_x^2 + g |\psi(x,t)|^2 - V^{+}(x) \, \} \, \psi(x,t) = 0, where V^{+}(x) = \qty( -b^2 - m^2 + 1/4 ) \, \sech^2(x) - 2 i \, m \, b \, \sech(x) \, \tanh(x) represents the complex potential. Here we study the perturbations as a function of $b$ and $m$ using a variational approximation based on a dissipation functional formalism. We compare the result of this variational approach with direct numerical simulation of the equations. We find that the variational approximation works quite well at small and moderate values of the parameter $b m$ which controls the strength of the imaginary part of the potential. We also show that the dissipation functional formalism is equivalent to the generalized traveling wave method for this type of dissipation.Comment: 18 pages, 6 figure

Entrevista a Jean Michel Vappereau

John Quintero: En un reportaje sobre usted, hecho por Mirtha Benítez y Ariel Pernicone, publicado en la página web de la revista Fort-Da en octubre de 2000,1 menciona el impacto que le produjo la lectura del texto Más allá del principio del placer de Freud. ¿Cuál fue ese impacto?Jean Michel Vappereau: Bien, quiero responderle de una manera ordenada. Usted sabe que he hecho estudios de matemática. Para mí el psicoanálisis no tenía nada que ver con las matemáticas ni con la ciencia

Vegetable Proteins: Non-sensitizing Encapsulation Agents for Bioactive Compounds

Plant-derived proteins are remarkable macromolecules of scientific interest because they represent an alternative to the animal-derived proteins and petroleum-derived polymers. Many food proteins especially those derived from animal sources could act as antigens in humans. For instance, milk proteins extracted from cows may cause food intolerance during infancy. Further, soybean, peanuts, tree nuts, fish, crustacean shellfish and egg proteins may act as antigens in 90% of children. Since the GI tract is permeable to intact antigens the oral intake of these proteins may generate gastrointestinal (50–80%), cutaneous (20-40%) and respiratory symptoms (4–25%). Most of these allergens are water-soluble glycoproteins that are resistant to acids and enzymes. Usually, these proteins have a small molecular weight (10,000–60,000 kDa), water solubility, glycosylation residues, and a relative resistance to heat and digestion. Allergenicity is less frequent in vegetable proteins due to their less flexible and non-compact structure. Allergenicity is also related to the resistance to proteolysis, post-translational glycosylation, presence of epitopes, and enzymatic proteolysis. Moreover, proteins serve as a coating material if structural modifications in the protein, either by physical, chemical or enzymatic mechanisms are conducted. As a result, their allergenicity is reduced, and their functional properties are enhanced

Convergence of the steepest descent method with line searches and uniformly convex objective in reflexive Banach spaces

In this paper, we present some algorithms for unconstrained convex optimization problems. The development and analysis of these methods is carried out in a Banach space setting. We begin by introducing a general framework for achieving global convergence without Lipschitz conditions on the gradient, as usual in the current literature. This paper is an extension to Banach spaces to the analysis of the steepest descent method for convex optimization, most of them in less general spaces

A modified backward/forward sweep-based method for reconfiguration of unbalanced distribution networks

A three-phase unbalanced power flow method can provide a more realistic scenario of how distribution networks operate. The backward/forward sweep-based power flow method (BF-PF) has been used for many years as an important computational tool to solve the power flow for unbalanced and radial power systems. However, some of the few available research tools produce many errors when they are used for network reconfiguration because the topology changesafter multiple switch actions and the nodes are disorganized continually. This paper presents a modifiedBF-PF for three-phase unbalanced radial distribution networks that is capable of arranging the system topology when reconfiguration changes the branch connections. A binary search is used to determine the connections between nodes, allowing the algorithm to avoid those problems when reconfiguration is carried out, regardless of node numbers. Tests are made to verify the usefulness of the proposed algorithm in both the IEEE 13-node test feeder and the 123-node test feeder, converging in every run where constraints are accomplished. This approach can be used easily for a large-scale feeder network reconfiguration. The full version of this modified backward/forward sweep algorithm is available for research at MathWorks

Inteligencia de mercados: comportamientos estratégicos sobre precios de oferta en el mercado spot eléctrico Colombiano

El mercado de energía mayorista es uno de los sectores industriales más competitivos de Colombia, y representa uno de los ejes principales en la economía del país. Este mercado ha sido objeto de estudio de varias áreas de conocimiento como la ingeniería eléctrica, economía, finanzas y otros. Aquí se presenta un análisis de los posibles comportamientos estratégicos de los principales agentes de la industria, desde la perspectiva de la inteligencia artificial orientada a la inteligencia de mercados, es decir, un trabajo multidisciplinar centrado en la explicación y emulación de la conducta inteligente y posiblemente estratégica de los agentes involucrados en la actividad de generación de energía en Colombia.The energy market is one of the most competitive Colombian industry sectors, and represents one of the main strategic focus in economy and development of the country. This market has been under study of many knowledge areas such as electric engineering, economy, financial and others. In this work, is presented an analysis of all the possible strategic behaviors of major industry players, from the basis of artificial intelligence oriented to market intelligence, that is, a multidisciplinary work focused on the explanation and emulation of intelligent behavior and possibly strategic of the actors involved in each market activities and in particular the behavior of energy-generating agents in Colombia

Costos de Transacción y Formas de Gobernación de los Servicios de Consulta en Colombia

This paper evaluates the extent to which the establishment of the different governance forms linking hospitals to insurance companies in Bogotá is carried out taking into account transaction costs reduction criteria. An empirical test is applied, using thCriterios de decisión, organización industrial, costos de transacción, aplicaciones en sector salud

Optimal Power Distribution Network Reconfiguration using Cuckoo Search

This paper presents an adaptation of a new metaheuristic algorithm known as Cuckoo Search (CS) to solve the distribution network reconfiguration problem (DNRC), where the objective is to minimize the real power losses subject to constraints such as voltage levels in nodes, current levels in branches, and maintaining a radial topology in the distribution test system. The performance of the proposed method is compared with a popular meta-heuristic algorithm, Ant Colony Optimization (ACO). The methods have been tested on the IEEE 37 bus radial distribution system. Experiments were carried out to compare the simulation time, which is a critical measure for the real implementation of the method in real power distribution systems

Infrared thermography for water management on high tunnel cultivation of strawberry (Fragaria x ananassa Duch)

Water management of strawberry cultivation is one of the main problems of production in Colombia, reflected in the loss of fruit or deformation of the same. Plants of two strawberry varieties (Fragaria x ananassa Duch), were irrigated in optimum and slight hydric deficit conditions, in a high tunnel system at the Savannah of Bogotá. Environmental variables (temperature, relative humidity, PAR radiation and vapor pressure deficit) and physiological variables (canopy temperature, substrate moisture content, stomatal conductance) were monitored for five months, in order to validate the hydric status of the crop through use of water stress index – CWSI. It was concluded that the use of thermographic images is a valid tool to detect hydric stress in protected small crops, given its high correlation with other methods and is one of the most complete monitoring methods for water management, since it relates the physiological characteristics of the crop with the climatic variables that affect it.El manejo hídrico del cultivo de fresa es uno de los principales problemas de producción en Colombia, reflejado en las perdidas de frutos o deformación de estos. Plantas de dos variedades de fresa (Fragaria x ananassa Duch), fueron irrigadas tanto en condiciones óptimas de riego como en déficit hídrico leve, en un macro túnel en la Sabana de Bogotá. Para el manejo hídrico se realizó el seguimiento durante cinco meses de variables climáticas (temperatura, humedad relativa, radiación PAR y déficit de presión de vapor) y del cultivo (temperatura del dosel, contenido de humedad de sustrato y conductancia estomática), buscando validar mediante la correlación de estos métodos conocidos el seguimiento del estado hídrico de las plantas de fresa mediante el método del índice de estrés hídrico del cultivo - CWSI. Se concluye que las imágenes termográficas mediante el CWSI son una herramienta válida y completa para la detección de estrés hídrico en cultivos protegidos de porte bajo, dada la alta correlación con otros métodos, y la ventaja que ofrece de relacionar el seguimiento de las características fisiológicas del cultivo con las variables climáticas que lo afectan