A Multi-User Interactive Coral Reef Optimization Algorithm for Considering Expert Knowledge in the Unequal Area Facility Layout Problem

The problem of Unequal Area Facility Layout Planning (UA-FLP) has been addressed by a large number of approaches considering a set of quantitative criteria. Moreover, more recently, the personal qualitative preferences of an expert designer or decision-maker (DM) have been taken into account too. This article deals with capturing more than a single DM’s personal preferences to obtain a common and collaborative design including the whole set of preferences from all the DMs to obtain more complex, complete, and realistic solutions. To the best of our knowledge, this is the first time that the preferences of more than one expert designer have been considered in the UA-FLP. The new strategy has been implemented on a Coral Reef Optimization (CRO) algorithm using two techniques to acquire the DMs’ evaluations. The first one demands the simultaneous presence of all the DMs, while the second one does not. Both techniques have been tested over three well-known problem instances taken from the literature and the results show that it is possible to obtain sufficient designs capturing all the DMs’ personal preferences and maintaining low values of the quantitative fitness function

Elaboración del sistema de gestión de seguridad operacional para los servicios de navegación aérea del Comando Aéreo de Combate No. 4

El Escuadrón de Navegación Aérea es la dependencia encargada de prestar los Servicios de Navegación Aérea en las áreas bajo jurisdicción del Comando Aéreo de Combate N.4; en estos espacios aéreos se desarrollan la mayor cantidad de operaciones aéreas de la Fuerza Aérea Colombiana, razón por la cual los peligros inherentes a la actividad aérea deben ser tratados con la importancia que se merecen a fin de evitar eventos no deseados. La Fuerza Aérea Colombiana ha adoptado las medidas necesarias a fin de garantizar que las operaciones cumplan los más altos estándares de calidad y seguridad, motivo por el cual ha implementado sistemas de gestión que permitan el logro de objetivos y el cumplimiento de la misión. Este trabajo busca elaborar el sistema de gestión de la seguridad operacional para los servicios de navegación aérea de la unidad con el cual se haga una adecuada gestión de los riesgos que faciliten al controlador de tránsito aéreo cumplir su labor y defina responsabilidades de todos los miembros de la organización

Locating hidden river courses via geo-technical investigation – application in the city of Granada, Spain

The diversion of natural river courses and subsequent filling by alluvial deposits or anthropic intervention has been hidden by urban development in the majority of the cities. The research we conducted involved monitoring the evolution of a river course and reconnaissance of the original morphology of the fluvial systems. Our research was applied to the section of the River Beiro that flows through the city of Granada, Spain. The research has been carried out using geo-technical methodology based on reconnaissance via dynamic penetration. This allowed us to determine the different degrees of consolidation and compaction in the areas corresponding with the former course of the river, which are now filled by alluvial deposits. In addition, we have backed up our findings with information provided by historical maps of the city of Granada. The results have identified an area wherein buildings are at risk, as evidenced by the detrimental effects registered in the buildings in this area

Using eye-tracking into decision makers evaluation in evolutionary interactive UA-FLP algorithms

Unequal area facility layout problem is an important issue in the design of industrial plants, as well as other fields such as hospitals or schools, among others. While participating in an interactive designing process, the human user is required to evaluate a high number of proposed solutions, which produces them fatigue both mental and physical. In this paper, the use of eye-tracking to estimate user’s evaluations from gaze behavior is investigated. The results show that, after a process of training and data taking, it is possible to obtain a good enough estimation of the user’s evaluations which is independent of the problem and of the users as well. These promising results advice to use eye-tracking as a substitute for the mouse during users’ evaluations

A Hybrid Coral Reefs Optimization – Variable Neighborhood Search Approach for the Unequal Area Facility Layout Problem

The Unequal Area Facility Layout Problem (UA-FLP) is a relevant optimization problem related to industrial design, that deals with obtaining the most effective allocation of facilities, that make up the rectangular manufacturing plant layout. The UA-FLP is known to be a hard optimization problem, where meta-heuristic approaches are a good option to obtain competitive solutions. Many of these computational approaches, however, usually fall into local optima, and suffer from lack of diversity in their population, mainly due to the huge search spaces and hard fitness landscapes produced by the traditional representation of UA-FLP. To solve these issues, in this paper we propose a novel hybrid meta-heuristic approach, which combines a Coral Reefs Optimization algorithm (CRO) with a Variable Neighborhood Search (VNS) and a new representation for the problem, called Relaxed Flexible Bay Structure (RFBS), which simplifies the encoding and makes its fitness landscape more affordable. Thus, the use of VNS allows more intensive exploitation of the searching space with an affordable computational cost, as well as the RFBS allows better management of the free space into the plant layout. This combined strategy has been tested over a set of UA-FLP instances of different sizes, which have been previously tackled in the literature with alternative meta-heuristics. The tests results show very good performance in all cases

A novel multi-objective Interactive Coral Reefs Optimization algorithm for the Unequal Area Facility Layout Problem

The Unequal Area Facility Layout Problem (UA-FLP) has been widely analyzed in the literature using several heuristics and meta-heuristics to optimize some qualitative criteria, taking into account different restrictions and constraints. Nevertheless, the subjective opinion of the designer (Decision Maker, DM) has never been considered along with the quantitative criteria and restrictions. This work proposes a novel approach for the UA-FLP based on an Interactive Coral Reefs Optimization (ICRO) algorithm, which combines the simultaneous consideration of both quantitative and qualitative (DM opinion) features. The algorithm implementation is explained in detail, including the way of jointly considering quantitative and qualitative aspects in the fitness function of the problem. The experimental part of the paper illustrates the effect of including qualitative aspects in UA-FLP problems, considering three different hard UA-FLP instances. Empirical results show that the proposed approach is able to incorporate the DM preferences in the obtained layouts, without affecting much to the quantitative part of the solutions

Relación entre parentalidad, depresión, ansiedad y estrés y el fenómeno de la ideación suicida durante la adolescencia

82 p.El presente estudio tiene como objetivo estimar los efectos de las variables parentales de control psicológico, apoyo, demanda, y depresión, ansiedad y estrés sobre la ideación suicida durante la adolescencia. La muestra comprende 243 adolescentes de diez a 17 años de edad (125 mujeres y 118 hombres) que residen en la Comuna de Curepto, Región del Maule, Chile. El estudio es de carácter cuantitativo, transversal y no experimental, buscando establecer la relación entre las variables dependientes ideación suicida en el peor momento de la vida y durante el último mes con las independientes control psicológico madre y padre, apoyo, demanda, ansiedad, estrés, depresión, sexo y edad. Para ésto se realizó un análisis correlacional y de regresión lineal múltiple para analizar las posibles influencias que pueden tener las variables independientes. Se obtuvieron dos principales resultados: 1) el control psicológico del padre y de la madre, y la depresión, ansiedad y estrés se relacionaron positivamente con la ideación suicida durante la adolescencia; 2) el apoyo actúa como factor protector ante la ideación suicida. Adicionalmente, se encontraron diferencias entre ideación suicida y sexo, ideación y adolescencia temprana (diez a catorce años) o media (quince a 17 años), e ideación y situación de pareja de los padres (separados o no), presentando mayor ideación el sexo femenino, los adolescentes que se encuentran en la adolescencia media y aquellos cuyos padres están separados. Palabras Clave Adolescencia, ideación suicida, parentalidad, depresión, ansiedad, estrés

Fouling study of nanofiltration membranes for sugar control in grape must: Analysis of resistances and the role of osmotic pressure

Producción CientíficaThree membranes are analyzed attending to their retention, flux and fouling when used to nanofiltrate sugars in red grape musts. With high molecular weight compounds, fouling develops from initial pore blocking to final cake deposition. A decrease of resistance appears due to a decrease of the effective transmembrane pressure and cake compaction. The final effective pore size corresponds to that of the compacted cake. Attending to flux decay and sugar retention, two membranes, HL and SR3, are appropriate to reduce the content of sugar of red must. Specifically SR3 shows the best passage of sugar and less foulingJunta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA302U13

Diagnóstico del desarrollo del pensamiento matemático avanzado en la formación inicial del profesor de Matemática

This article presents the main results of a study and diagnosis of the development of advanced mathematical thinking, in the initial training of the mathematics teacher from the discipline of Mathematical Analysis. Initially, it is carried out a systematization of some theoretical conceptions on this type of thought until arriving to its definition and parameterization; later, an interactive pedagogical test is implemented to the students and an integral analysis of the results is carried out, complementing them with interviews to the students, observation to classes and survey to professorsEn este artículo se presentan los principales resultados de un estudio y diagnóstico del desarrollo del pensamiento matemático avanzado, en la formación inicial del profesor de matemática desde la disciplina Análisis Matemático. Inicialmente, se realiza una sistematización de algunas concepciones teóricas sobre este tipo de pensamiento hasta llegar a su definición y parametrización; posteriormente, se implementa una prueba pedagógica interactiva a los estudiantes y se realiza un análisis integral de los resultados, complementándolos con entrevista a los estudiantes, observación a clases y encuesta a profesores

Angular velocity assessment in the active straight leg raise test: Validity and reliability of an inertial device (WIMU PROTM)

Currently, there is an increase in the inertial devices application to measure active range of movement and angular velocity in exercises with a centre of rotation. Therefore, before it uses, a validity and reliability analysis of these devices are required. Objectives: The aims of this research were to describe the angular velocity performed in the active straight leg raise (EAPR) test and to assess the validity and between-units reliability of an inertial device for its measure. Method: 20 national-level football players volunteered to participate in this study, 10 youth players (age: 17.2 ± 0.87 years; height: 1.77±0.08 m; body mass: 67.96±3.4 kg; BMI: 21.7±1.2 kg/m2) y 10 senior players (age: 25.6 ± 4.24 years; height: 1.80±0.05 m; body mass: 73.35±4.2 kg; BMI: 22.63±1.7 kg/m2). 10 trials of EAPR test (5 trial with each leg) were performed. To assess between-unit’s reliability, two inertial devices WIMU PROTM (RealTrack Systems, Almeria, Spain), that registered simultaneously, were compared. Instead, video analysis was used as criterion to validity assesment. The analysis and export process of inertial device data was realized by S PROTM software (RealTrack Systems, Almeria, Spain). For video-analysis, this process was realized by Kinovea®. Results: The angular velocity average performed by the athletes was 137.64±21.13º/s. A perfect validity between video analysis and WIMU PROTM (ICC=1.00; r=1.00) and a very good reliability between WIMU PROTM devices (Bias=.41º/s; CV=.22%) was found. Conclusion: WIMU PROTM is a reliable and valid device to measure angular velocity in EAPR test