Search results for "Variable"
showing 10 items of 1674 documents
Real-time transmission over Switched Ethernet using a contracts based framework
2009
Switched Ethernet is being used for real time transmissions in industrial automation more and and more. Most modern industrial switches are equipped with mechanisms to deal with time predictability. However, real-time transmission not only requires these mechanisms, but also the proper policies for managing network resources. This paper proposes the use of contracts. A contract is a set of transmission specifications which are negotiated between the applications and the run-time support. They define the application workload and the required performance guarantees. We implement contracts for real-time streaming as an extension of FRESCOR (Framework for Real-time Embedded Systems based on COn…
Tratamiento econométrico de las variables cualitativas
1981
National audience
Efficient GRASP+VND and GRASP+VNS metaheuristics for the traveling repairman problem
2011
Abstract: The traveling repairman problem is a customer-centric routing problem, in which the total waiting time of the customers is minimized, rather than the total travel time of a vehicle. To date, research on this problem has focused on exact algorithms and approximation methods. This paper presents the first metaheuristic approach for the traveling repairman problem.
Suspension system performance optimization with discrete design variables
2013
Published version of an article in the journal: Structural and Multidisciplinary Optimization. Also available from the publisher at: http://dx.doi.org/10.1007/s00158-013-0888-7 Suspension systems on commercial vehicles have become an important feature meeting the requirements from costumers and legislation. The performance of the suspension system is often limited by available catalogue components. Additionally the suspension performance is restricted by the travel speed which highly influences the ride comfort. In this article a suspension system for an articulated dump truck is optimized in sense of reducing elapsed time for two specified duty cycles without violating a certain comfort th…
Incidencia de factores personales y contextuales sobre el uso de los recursos tecnológicos por el alumnado en América Latina
2021
El uso de las tecnologías de la información y de la comunicación (TIC) por parte de alumnado refleja si el proceso de integración es apropiado. No obstante, la tipología de uso de las TIC en el alumnado no se ha establecido de forma empírica en función de su uso en casa y el centro educativo. Así, el propósito del artículo es determinar la estructura del uso de las TIC por parte del alumnado, junto con la influencia de factores personales y contextuales. Se ha empleado un diseño correlacional, siendo la muestra el alumnado de sexto curso de América Latina que ha respondido al cuestionario sobre uso de las TIC en el Tercer Estudio Regional Comparativo y Explicativo (TERCE). El análisis de da…
A case study of a precision fertilizer application task generation for wheat based on classified hyperspectral data from UAV combined with farm histo…
2013
Different remote sensing methods for detecting variations in agricultural fields have been studied in last two decades. There are already existing systems for planning and applying e.g. nitrogen fertilizers to the cereal crop fields. However, there are disadvantages such as high costs, adaptability, reliability, resolution aspects and final products dissemination. With an unmanned aerial vehicle (UAV) based airborne methods, data collection can be performed cost-efficiently with desired spatial and temporal resolutions, below clouds and under diverse weather conditions. A new Fabry-Perot interferometer based hyperspectral imaging technology implemented in an UAV has been introduced. In this…
Influencia de la práctica deportiva en la morfología de la espalda. Estudio mediante proyección de luz estructurada
2014
INTRODUCCIÓN: Desde 1920 se ha demostrado la asociación entre la variación de la forma de la columna y el trabajo repetitivo requerido en los deportes. Las características físicas de los sujetos facilitan el éxito de cada uno de los distintos deportes y la práctica deportiva profesionalizada lleva asociada un tipo y grado de lesiones relacionada con el deporte. HIPÓTESIS DE TRABAJO La práctica deportiva difiere de un tipo de deporte a otro e incluso dentro de él, en función de las acciones que requieren las distintas posiciones de juego. Esta diferente actividad puede afectar a la producción de lesiones y también puede modificar la morfología de la espalda, debido a la diferente activación …
Spaces of Dirichlet series
2019
This work is dedicated to the study of multiple Dirichlet series and it focuses on three main aspects: convergence, spaces of bounded multiple Dirichlet series and the composition operators of such spaces. In the first chapter we give the necessary preliminary results on regular convergence of double and multiple series and its equivalence with the definition of convergence in a restricted sense. We also recall sequences of bounded variation and we show how they are the multipliers of convergent series in the space of sequences, extending also this characterization to double and multiple regularly conergent series. In the second chapter we recall the fundamentals on the theory of bounded or…
Quasihyperbolic boundary conditions and capacity: Uniform continuity of quasiconformal mappings
2005
We prove that quasiconformal maps onto domains which satisfy a suitable growth condition on the quasihyperbolic metric are uniformly continuous when the source domain is equipped with the internal metric. The obtained modulus of continuity and the growth assumption on the quasihyperbolic metric are shown to be essentially sharp. As a tool, we prove a new capacity estimate.
Weak chord-arc curves and double-dome quasisymmetric spheres
2014
Let $\Omega$ be a planar Jordan domain and $\alpha>0$. We consider double-dome-like surfaces $\Sigma(\Omega,t^{\alpha})$ over $\overline{\Omega}$ where the height of the surface over any point $x\in\overline{\Omega}$ equals $\text{dist}(x,\partial\Omega)^{\alpha}$. We identify the necessary and sufficient conditions in terms of $\Omega$ and $\alpha$ so that these surfaces are quasisymmetric to $\mathbb{S}^2$ and we show that $\Sigma(\Omega,t^{\alpha})$ is quasisymmetric to the unit sphere $\mathbb{S}^2$ if and only if it is linearly locally connected and Ahlfors $2$-regular.