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Listar por autor "García Raffi, Luis Miguel"

Mostrando ítems 1-20 de 97

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A Bellman-Ford Algorithm for the Path-Length-Weighted Distance in Graphs

Arnau-Notari, Andres Roger; Calabuig, J. M.; García-Raffi, L. M.; Sánchez Pérez, Enrique Alfonso; Sanjuan-Silvestre, Sergi (MDPI AG, 2024-08)

[EN] Consider a finite directed graph without cycles in which the arrows are weighted by positive weights. We present an algorithm for the computation of a new distance, called path-length-weighted distance, which has ...
A Heuristic Algorithm Based on Monte Carlo Methods for the Rural Postman Problem

Fernández de Córdoba, Pedro; García-Raffi, L. M.; Sanchís Llopis, José María (Elsevier, 1998)

[EN] The Rural Postman Problem (RPP) consists of finding a minimum cost traversal of a specified are subset of a graph. Given that the RPP is a NP-hard problem, heuristic algorithms are interesting both to handle large ...
A non-linear approach to signal processing bymeans of vector measure orthogonal functions

García-Raffi, L. M.; Jiménez Fernández, Eduardo; Sánchez Pérez, Enrique Alfonso (European Mathematical Society, 2013-06)

[EN] Sequences of real functions that are orthogonal with respect to a vector measure are a natural generalization of the orthogonal systems with respect to a parametric measure. In this paper we develop a new procedure ...
A phenomenological model for sonic crystals based on artificial neural networks

Fuster García, Elíes; Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel; Sánchez Pérez, Enrique Alfonso (Acoustical Society of America, 2006-08)

[EN] A phenomenological model that simulates the acoustic attenuation behavior of sonic crystals is developed in this paper. The input of the model is a set of parameters that characterizes each experimental setup, and ...
A real delivery problem dealt with Monte Carlo techniques

Fernández de Córdoba, Pedro; García-Raffi, L. M.; Mayado, A.; Sanchís Llopis, José María (Springer-Verlag, 2000)

[EN] In this paper we use Monte Carlo Techniques to deal with a real world delivery problem of a food company in Valencia (Spain). The problem is modeled as a set of 11 instances of the well known Vehicle Routing Problem, ...
A study of the mesh effect on a rocket plume simulation

Ramírez, Federico N.; Escarti-Guillem, Mara S.; García-Raffi, L. M.; Hoyas, S (Elsevier, 2022-03)

[EN] The use of reliable CFD models for the simulation of spacecraft launch is crucial due to the complexity of obtaining experimental data. The validity of the results depends on the numerical schemes used and the mesh. ...
Absorción sonora en cristales de sonido: aplicación en el lanzamiento de cohetes espaciales

Herrero Durá, Iván; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; García Raffi, Luis Miguel; Romero García, Vicente (2017)

[EN] The high acoustic pressure levels experienced by spacecrafts and launchers during the lift-off are due, among other factors, to the reflection of the sound waves in the launch pad. We propose in this work the use ...
Acoustic behavior of the VEGA launch pad environment

Picó Vila, Rubén; Herrero-Durá, Iván; Sánchez Morcillo, Víctor José; Salmerón-Contreras, L. J.; García-Raffi, L. M. (Universidade do Porto, 2016-06-15)

[EN] The acoustic pressure levels experienced by the spacecraft and launchers during the lift-off is due among other factor by the reflection of the sound waves on the launch pad. The acoustic load distribution in the area ...
Acoustic Bessel-like beam formation by an axisymmetric grating

Jimenez, Noe; Romero García, Vicente; Picó Vila, Rubén; Cebrecos Ruiz, Alejandro; Sánchez Morcillo, Víctor José; García-Raffi, L. M.; Sánchez Pérez, Juan Vicente; Staliünas, Kestutis (European Physical Society, 2014-04)

We report Bessel-like beam formation of acoustic waves by means of an axisymmetric grating of rigid tori. The results show that the generated beam pattern is similar to that of Bessel beams, characterized by elongated ...
Acoustic noise reduction methods for the launch pad

Herrero Durá, Iván (Universitat Politècnica de València, 2020-06-19)

[ES] Los niveles de presión acústica experimentados por las naves espaciales y las lanzaderas durante las fases iniciales del lanzamiento (ignición de motores y despegue) pueden ser muy significativos para estructuras ...
Aeroacoustic Improvements during Lift-off of Launch Vehicles

Escartí Guillem, Mara Salut (Universitat Politècnica de València, 2024-06-03)

[ES] La investigación realizada como parte de este doctorado industrial en COMET Ingeniería y la Universitat Politècnica de València aborda el problema crítico de las cargas vibroacústicas durante la fase de despegue de ...
Ajuste de señales usando Algoritmos Genéticos

Pérez Romero, Santiago (Universitat Politècnica de València, 2018-11-07)

Son innumerables los fenómenos que en diversas disciplinas (Física, Química, Biología, Electrónica, Telecomunicaciones) involucran la adquisición y análisis de una señal para la obtención de información del comportamiento ...
An application of bilinear integration to quantum scattering

García-Raffi, L. M.; Jefferies, Brian (Elsevier, 2014-07)

Scattering theory has its origin in Quantum Mechanics. From the mathematical point of view it can be considered as a part of perturbation theory of self-adjoint operators on the absolutely continuous spectrum. In this work ...
Analysis of the wave propagation properties of a periodic array of rigid cylinders perpendicular to a finite impedance surface

Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel (European Physical Society, 2011)

[EN] The effect of the presence of a finite impedance surface on the wave propagation properties of a two-dimensional periodic array of rigid cylinders with their axes perpendicular to the surface is both numerically and ...
Analytical approximations for multiple scattering in one-dimensional waveguides with small inclusions

Lázaro, Mario; Wiltshaw, Richard; Craster, Richard V.; García-Raffi, L. M. (Elsevier, 2025-01-01)

[EN] In this paper, we propose a new model to approximate the wave response of waveguides containing an arbitrary number of small inclusions. The theory is developed for general onedimensional elastic waveguides to study ...
Analytical model to predict the effect of a finite impedance surface on the propagation properties of 2D Sonic Crystals

Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel (IOP Publishing: Hybrid Open Access, 2011)

The use of sonic crystals (SCs) as environmental noise barriers has certain advantages from both the acoustical and the constructive points of view with regard to conventional ones. However, the interaction between the SCs ...
Análisis competencial de una tarea de modelización abierta

Gallart-Palau, Cesar; Ferrando Palomares, Irene; García-Raffi, L. M. (Sociedad Canaria "Isaac Newton" de Profesores de Matematicas, 2015-03)

[ES] Según diversos autores, las actividades dirigidas al desarrollo conjunto de las competencias matemáticas deben relacionarse con la realidad y los procesos de modelización matemática. El objetivo del presente trabajo ...
Análisis de los Modelos Matemáticos Producidos durante la Resolución de Problemas de Fermi

Ferrando Palomares, Irene; Albarracín, Lluis; Gallart-Palau, Cesar; García-Raffi, L. M.; Gorgorió, Nuria (Universidade Estadual Paulista Júlio de Mesquita, 2017-04)

[EN] In this paper, we present an analysis of written productions of 16 year-old students while solving Estimation Problems involving Big Numbers (EPiBN). This kind of problems is a particular type of Fermi problems and ...
Análisis de los procesos de resolución de tres tareas de modelización

Gallart Palau, Cèsar; Ferrando Palomares, Irene; García-Raffi, L. M. (Universitat Politècnica de València, 2017-08-01)

[EN] n this paper we present a comparative analysis of the resolution process of three modeling tasks per-formed by secondary education students (13-14 years), designed from three di erent points of view: ...
Análisis semántico latente mediante descomposición en valores singulares

Mamani Roque, Maribel (Universitat Politècnica de València, 2018-12-17)

La descomposición en valores singulares tiene numerosas aplicaciones tanto el campo de la matemática (aproximación lineal mediante mínimos cuadrados, cálculo de la ma-triz psudeoinversa, ) como en el de la ingeniería ...