4,524 research outputs found

    Making more flexible ATISMART+ model for traffic simulations using a CAS

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    Traffic simulations usually require the search of a path to join two different points. Dijkstra’s algorithm [1] is one of the most commonly used for this task due to its easiness and quickness. In [2, 3] we developed an accelerated time simulation of car traffic in a smart city using Dijkstra’s algorithm to compute the paths. Dijkstra’s algorithm provides a shortest path between two different points but this is not a realistic situation for simulations. For example, in a car traffic situa- tion, the driver may not know the shortest path to follow. This ignorance can be produced, among others, because one of the following two facts: the driver may not know the exact length of the lanes, or, even knowing the exact length, the driver may not know how to find the shortest path. Even more, in many cases, a mixture of both facts occurs. A more realistic simulation should therefore consider these kind of facts. The algorithm used to compute the path from one point to another in a traffic simulation might consider the possibility of not using the shortest path. In this talk, we use a new probabilistic extension of Dijkstra’s algorithm which covers the above two situations. For this matter, two different modifications in Di- jkstra’s algorithm have been introduced: using non-exact length in lanes, and the choice of a non-shortest path between two different points. Both modifications are used in a non-deterministic way by means of using probability distributions (classi- cal distributions such as Normal or Poisson distributions or even "ad hoc" ones). A precise, fast, natural and elegant way of working with such probability distributions is the use of a CAS in order to deal with exact and explicit computations. As an example of use of this extension of Dijkstra’s algorithm, we will show the ATISMART+ model. This model provides more realistic accelerated time sim- ulations of car traffics in a smart city and was first introduced in [4] and extended in [5]. This model was developed combining J AVA for the GUI and M AXIMA for the mathematical core of the algorithm. The studies developed in the above mentioned works, dealt with Poisson, Ex- ponential, Uniform and Normal distributions. In this talk we will introduce, as a novelty, the possibility of using other continuous probability distributions such as: Lognormal, Weibul, Gamma, Beta, Chi-Square, Student’s t, Z, Pareto, Lo- gistic, Cauchy or Irwin-Hall, and other discrete distributions such as: Bernouille, Rademacher, Binomial, Geometric, Negative Binomial or Hypergeometric. Even 1 more, this new version allows to deal with any “ad-hoc” continuous, discrete or mixed user’s distributions. This fact improves the flexibility of ATISMART+ model.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

    Posidonia oceanica (L.) Delile in its westernmost biogeographical limit (northwestern Alboran Sea): Meadows characterisation, phenology and flowering events

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    Mateo-Ramírez A, Urra J, Rueda J, Marina, Bañares-España E, García Raso E. (2016) Posidonia oceanica (L.) Delile in its westernmost biogeographical limit (northwestern Alboran Sea): Meadows characterisation, phenology and flowering events. Front. Mar, Sci. Conference Abstract: XIX Iberian Symposium on Marine Biology Studies. doi: 10.3389/conf.FMARS.2016.05.00055Posidonia oceanica is a Mediterranean endemic seagrass species that forms meadows covering ca. 2.5–4.5 millions of hectares, representing ca.25 % of the infralittoral and shallow circalittoral (down to 50m) bottoms of the Mediterranean. This seagrass is considered a habitat-engineer species and provides an elevated number of ecosystem services. In addition the Marine Strategy Framework Directive (MSFD, 2008/56/EC) includes seagrass like elements to evaluate the “Good Environmental Status” of the European coasts. Information about their phenological characteristic and structure of the meadows is needed for indicator estimations in order to establish their conservation status. The studied meadows are located in the westernmost limit of the P. oceanica distribution (North-western Alboran Sea) in the vecinity of the Strait of Gibraltar, an Atlantic-Mediterranean water transition area. Four sites were selected from East to West: Paraje Natural de Acantilados de Maro-Cerro Gordo (hereafter Maro), Special Area of Conservation “Calahonda” (hereafter Calahonda), Site of Community Importance Estepona (hereafter Estepona) and Punta Chullera (hereafter Chullera) where P. oceanica present their westernmost meadows. Phenological data were recorded from mid November to mid December in P. oceanica patches located at 2 – 3 m depth. At each site three types of patches (patch area 2 m2, large patches) were sampled. At each patch and site, 3 quadrants of 45 x 45 cm were sampled for shoot and inflorescences density measurements. In each quadrant, 10 random shoots were sampled for shoot morphology (shoot height and number of leaves). Shoot and inflorescences densities were standardized to squared meters. All the studied P. oceanica meadows develop on rocks and they present a fragmented structure with a coverage ranging between ca. 45% in Calahonda and Estepona and ca. 31% in Maro. The meadows of Chullera are reduced to a few small - medium patches with areas ranging between 0.5-1.5 m2 (Fig. 1). The meadows of Chullera and Estepona presented similar values of shoot density (ca. 752 – 662 shoots m-2, respectively) and leaf height (ca. 25 cm). Similarly, the Calahonda and Maro meadows also showed similar values of shoot density (ca. 510 – 550 shoots m-2, respectively) but displaying lower values than those of sites located closer to the Strait of Gibraltar. Regarding patch sizes and leaf height, the longest leaves (ca. 25 cm) were found in medium and large patches, but the number of leaves per shoot were higher in the small and the medium size patches (ca. 6.3 leaves per shoot). Flowering was only detected at the Calahonda meadows with maximum values of ca. 330 inflorescences m-2 (115.2 ± 98.2 inflorescences m-2, n= 9; mean ± SD) (Fig.1). Inflorescence density was not significant different among patches of different sizes. In the Alboran Sea and unlike the studied meadows, extensive beds of P. oceanica occur at the National Park of Cabo de Gata (northeastern Alboran Sea), but from east to west (Strait of Gibraltar), meadows are gradually fragmenting and their depth range decrease from 30m to 2m depth between Cabo de Gata and Chullera, respectively. Probably, the Atlantic influence and the characteristic oceanographic conditions of the Alboran Sea (i.e., higher turbidity, higher water turbulence) represent a developmental limiting factor for P. oceanica at higher depths. Similarities between the meadows located closer to Strait of Gibraltar (Chullera and Estepona) were detected as well as between those more distant (Calahonda and Maro). The first ones showed higher values of shoot densities and leaf heights than the formers, which could be relating to the higher hydrodynamic exposure found at Chullera and Estepona meadows. Regarding flowering events, sexual reproduction in P. oceanica is not common in different locations of the Mediterranean Sea. The available information seems to indicate that flowering represent an irregular event and it is related to high seawater temperature. In fact, the flowering episodes that occurred in Calahonda in November 2015, match with the warmest year ever recorded. This is the third flowering event registered in these meadows located close to the westernmost distributional limit of P. oceanica (Málaga, Alboran Sea), which could indicates that these meadows presents a healthy status. Furthermore, the absence of significant differences in relation to inflorescence density between patches of different sizes may be indicating that the fragmentation does not necessarily influence on the flowering of this seagrass species.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

    Creatividad y cierre cognitivo

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    Artículo revisado por: Marzia Fiorini. Grupo de Investigación: Aprendizaje y Desarrollo en Contextos Educativos. Universidad de Granada | Jory Bolton. Trent UniversityThe aim of this paper is to present the relationship between the need for cognitive closure (NFC) and creativity. In light of previous research, a theoretical foundation is established for the term creativity. Next the social-cognitive phenomenon of the need for cognitive closure is explained based on the theory of Kruglanski and Webster, and considering the tendencies of urgency and permanency. Conclusion: The role of creativity is to control cognitive closure in order to solve problems that arise during the learning process and usually during the life.El objetivo de este trabajo es presentar la relación entre la necesidad de cierre cognitivo (NCC) y la creatividad. A la luz de las investigaciones realizadas, se establece la base teórica para el término de creatividad y la explica del fenómeno socio-cognitivo de necesidad de cierre cognitivo en base a la teoría de Kruglanski y Webster, teniendo en cuenta las tendencias de urgencia y permanencia. Conclusión: La creatividad tiene un papel importante de control del cierre cognitivo con el fin de resolver los problemas que surjan durante el proceso de aprendizaje y en general durante la vida.Universidad de Granada. Departamento de Psicología Social. Proyecto de Innovación Docente ReiDoCre

    Un programa de reforzamiento de la lengua: ¡10 minutos!

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    Proyecto de Innovacción Docente de Trent University¡10 minutos! is a program designed as a voluntary extra-curricular activity for students taking Spanish language courses who wish to practise and reinforce the lexical and grammatical constructions presented in class and in the textbook. The program began as a short daily email correspondence between students enrolled in the introductory-level Spanish course and the instructor, and has developed into a series of short, daily, conversation sessions between beginning students of Spanish and upper-year students of Spanish. The focus is on the use of meaningful language in everyday communication as well as the constancy of a simple daily activity that encourages students to focus on the language.¡10 minutos! es un programa diseñado como actividad extra-curricular voluntaria para los estudiantes que estudian los cursos de español y que desean practicar y reforzar las construcciones léxicas y gramaticales presentadas en clase y en el libro de texto. El programa comenzó como una breve correspondencia diaria por correo electrónico entre los estudiantes matriculados en el curso de español de nivel introductorio y el instructor, y se convirtió en una serie de sesiones cortas de conversación diarias entre los estudiantes principiantes y estudiantes avanzados de español. Se centra en el uso del lenguaje significativo en la comunicación cotidiana, así como la constancia de una actividad diaria simple que anima a los estudiantes a pensar en la lengua.Universidad de Granada. Departamento de Psicología Social. Proyecto de Innovación Docente ReiDoCre

    Performance optimization in switched reluctance motor drives

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    In this paper, switched reluctance motors (SRM) are proposed as an alternative for electric power assisted steering (EPAS) applications. A prototype machine has been developed as very attractive design for a steering electric motor, both from a cost and size perspective. A fourphase 8/6 SRM drive is designed for a rack type EPAS which should provide a maximum force of 10 kN. Two-dimension finite element analysis is used to validate the design

    Interfaz de adquisición de datos de una red de sensores por medio de un sistema embebido basado en microcontrolador PIC32 con comunicación USB

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    Proyecto de Graduación (Licenciatura en Ingeniería Electrónica). Instituto Tecnológico de Costa Rica. Escuela de Ingeniería Electrónica, 2010.The acquisition of data from a network of sensors to measure weather variables for agriculture can become an important and useful tool to develop efficient cropping plans. By having a database of weather patterns in a specific area, called microclimate, it is possible to increase the productivity of that area and obtain a better use of available resources both human and natural. This document presents an analytic description of the development of an embedded system based on PIC32 microcontroller to acquire data from a sensor network composed mainly of weather type sensors. The embedded system is capable of collecting and transmitting data through a USB port to a computer, in which the user can create their own database and may be able to view the data. Among the features of this system is its low cost, making it a viable solution for small and medium producers who do not have a tool to help them improve production, quality and resistance of a crop

    SÍNDROME BURNOUT VS NEUROANATOMÍA HOLÍSTICA FEMENINA = ÉXITOSA ESTRATEGIA DE AFRONTAMIENTO EN SALUD PÚBLICA MULTINIVEL EN GUANAJUATO

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    Una de las grandes ventajas en el Siglo XXI es la conectividad actual la cual minimiza la emisión y recepción de la información a nivel mundial con ello se potencializa que los profesionales de salud pública se encuentran inmersos en el escrutinio público (Ramírez, 2016). Repercutiendo en el aumento de la presión social que exige conductas principios y valores profesionales óptimos (Schultz, 1985). En el manejo del esquema de salud pública Guanajuatense. El capital humano Guanajuatense es muy diverso ya que dicho Estado cuenta con una multidimensional sectorial: agroalimentario, cuero-calzado, automotriz, turístico, religioso, etc. Sigilosamente, lenta y letal aparece con ellos en los profesionales sanitarios el síndrome de Burnout (Ramírez, 2016) teniendo una controversia ya que en ellos recaer velar por la salud integral de los Guanajuatenses omitiendo la propia. El objetivo de dicha investigación es conocer los niveles del Síndrome de Burnout en todo el Estado, así como sus categorías buscando una estrategia de afrontamiento eficiente y eficaz encontrando que la neuroanatomía holística femenina con una estrategia exitosa de afrontamiento. Efectuando un estudio mixto abarcando todos los niveles de salud pública y las ramas: médico, paramédico y administrativo único a nivel mundial. Con un muestreo de 316 participantes abarcando todo el sistema de salud multinivel de Guanajuato, usando Maslach Bournout Inventory (MBI) midiendo los niveles: bajo, medio severo. Concluyendo los siguientes resultandos: niveles severos en el género masculino con un 18.9% en contraparte del género femenino con un 10.8% y sus categorías: Cansancio emocional, despersonalización, y falta de realización profesional. Reflejando los siguientes resultados: 1.-Cansancio emocional femenino alto con un 39.46% en contraparte de los hombres con un 49.9%. 2.- Despersonalización alta género femenino 28% masculino 40.98%. 3.-Falta de realización profesional alta femenino un 33% masculino 36%. Para el análisis estadístico se empleó el SPSS ver 22.0. Aportando que la neuroanatomía femenina juega un papel protagonista como estrategia de afrontamiento contra el Síndrome de Burnout

    Estructuración y aplicación de un algoritmo cultural en la optimización de un portafolio de inversión

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    Tomando como base los aspectos fundamentales del método de computo evolutivo estocástico, el cual usa procesos aleatorios para determinar la dirección de búsqueda de una solución, para este caso en particular y mediante la estructuración en Matlab de un código que permitió ejecutar el Algoritmo Cultural propuesto por Robert G. Reynolds en 1978; abordando el problema de la optimización de portafolios de inversión bajo el modelo de Harry Markowitz presentado en 1952; como alternativa metodológica, permitiendo generar un portafolio de inversión eficiente, estable y diversificado; bajo el criterio de máximo beneficio o mínimo riesgo; se analizaron los dos criterios para 2, 5 y 8 diferentes grupos de acciones que conformarían el portafolio; bajo un ambiente de Algoritmo Cultural y se confrontó frente a un Algoritmo Genético convencional y un Algoritmo de Ascenso a la Colina; permitiendo de esta forma presentar una propuesta para la diversificación del portafolio

    Quantitative and ecological study of some grasshoppers population (Orth.: Acridoidea) in Sierra Espuña (Murcia, SE. España)

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    Utilizando diferentes técnicas estadísticas de análisis multivariante, entre ellas y de manera destacada el análisis binario discriminante («BDA», Binary Discriminat Analysis), se definen grupos ecológicos de poblaciones de saltamontes en relación con los tipos fisionómicos de vegetación de mayor relevancia en Sierra Espuña. Se estudian relaciones entre especies, y se confirma como fundamental el tipo de vegetación como factor ambiental determinante de la distribución de las poblaciones y comunidades de acrídidos. Se esquematizan los resultados de un cuadro-resumen de preferencias: poblaciones de saltamontes- vegetación.Using some different statistical techniques of multivariate analysis, mainly Binary Discriminant Analysis (BDA), ecological groups of grasshoppers populations have been defined and related to the main physiognomic vegetation types of Sierra Espuña. The relationships between species have also been studied and it has been confirmed that the type of vegetation is a fundamental factor in determining the distribution of populations and communities of Acridoidea. Results are summarized in a comprehensive table that shows the preferences of grasshoppers populations and vegetation

    Co-creation and open innovation: Systematic literature review

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    Open science, as a common good, opens possibilities for the development of nations, through innovations and collaborative constructions, which help to democratize knowledge. Advances in this area are still emerging, and the open science, cocreation of knowledge and open innovation triangle, is presented as an opportunity to generate an original contribution from research to open educational theory and practices. The study analyzed the articles that addressed this triangle, in order to identify the contexts and challenges that arise in open innovation and the cocreation of knowledge to promote open science. The method was a systematic literature review (SLR) of 168 articles published in open access format, from January 2014 to May 2017 in the Web of Science and Scopus databases. In the validation process, the York University criteria were used: inclusion and exclusion, relevance of the pertinent studies, evaluation of the quality / validity of included studies and description of data / basic studies. The findings showed that the mostwidely publicized contexts were in the United States and Brazil, in the business and academic sectors (closely followed by the social sector), and the challenges were open to innovation, opening and research. The research concludes that the context and practices of collaboration are substantial elements for innovation and open science
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