Exploració per autor "Rojas, Otilio"

Ara es mostren els items 1-20 de 21

    • A comparative study of two compact finite difference methods: standard vs. mimetic 

      Córdova, Luis Joaquin; Rojas, Otilio; Otero Calviño, Beatriz; Castillo, José (Sociedad Venezolana de Métodos Numéricos en Ingeniería, 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, we implement two fourth-order compact finite differences (CFD) methods and use them to model wave propagation on a elastic string. The formulation of the first method employs the standard implicit CFD constructed ...

    • A cost-efficient QoS-aware analytical model of future software content delivery networks 

      Otero Calviño, Beatriz; Rodríguez Luna, Eva; Rojas, Otilio; Verdú Mulà, Javier; Costa Prats, Juan José; Pajuelo González, Manuel Alejandro; Canal Corretger, Ramon (2021-07)
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      Accés obert
      Freelance, part-time, work-at-home, and other flexible jobs are changing the concept of workplace, and bringing information and content exchange problems to companies. Geographically spread corporations may use remote ...

    • A dispersion analysis of uniformly high order, interior and boundaries, mimetic finite difference solutions of wave propagation problems 

      Rojas, Otilio; Mendoza, Larry; Otero Calviño, Beatriz; Villamizar Morales, Jorge; Calderón, Giovanni; Castillo, José; Miranda, Guillermo (Springer, 2024)
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      Accés obert
      A preliminary stability and dispersion study for wave propagation problems is developed for mimetic finite difference discretizations. The discretization framework corresponds to the fourth-order staggered-grid Castillo-Grone ...

    • A new mimetic scheme for the acoustic wave equation 

      Solano, Freysimar; Guevara-Jordan, Juan; Rojas, Otilio; Otero Calviño, Beatriz; Rodriguez, R. (2016-03-15)
      Article
      Accés obert
      A new mimetic finite difference scheme for solving the acoustic wave equation is presented. It combines a novel second order tensor mimetic discretizations in space and a leapfrog approximation in time to produce an explicit ...

    • A performance analysis of a mimetic finite difference scheme for acoustic wave propagation on GPU platforms 

      Otero Calviño, Beatriz; Frances, Jorge; Rodriguez Cruz, Robert; Rojas, Otilio; Solano, Freysimar; Guevara-Jordan, Juan (2017-02-01)
      Article
      Accés obert
      Realistic applications of numerical modeling of acoustic wave dynamics usually demand high-performance computing because of the large size of study domains and demanding accuracy requirements on simulation results. Forward ...

    • A statistical approach towards fast estimates of moderate-to-large earthquake focal mechanisms 

      Monterrubio Velasco, Marisol; Carrasco Jimenez, Jose C.; Rojas, Otilio; Rodríguez, Juan E.; Fichtner, Andreas; Puente, Josep de la (Frontiers Media, 2022)
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      Accés obert
      Emerging high-performance computing systems, combined with increasingly detailed 3-D Earth models and physically consistent numerical wave propagation solvers, are opening up new opportunities for urgent seismic computing. ...

    • Alternating direction implicit time integrations for finite difference acoustic wave propagation: parallelization and convergence 

      Otero Calviño, Beatriz; Rojas, Otilio; Moya, Ferrán; Castillo, José (Elsevier, 2020-06-15)
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      Accés obert
      This work studies the parallelization and empirical convergence of two finite difference acoustic wave propagation methods on 2-D rectangular grids, that use the same alternating direction implicit (ADI) time integration. ...

    • Analysis of the key features of the seismic actions due to the three main earthquakes of May 11, 2011 in Lorca, Spain 

      Aguilar Meléndez, Armando; de la Puente Álvarez, Josep; Monterrubio Velasco, Marisol; Rodriguez Lozoya, Héctor Enrique; Rojas, Otilio; Calderón Ramón, Celia M.; Castillo Reyes, Octavio; García Elías, Alejandro; Campos Ríos, Amelia (2019)
      Article
      Accés obert
      The seismic records are in general valuable information, especially in cases where damage in buildings has occurred. The main purpose of the present document is to describe the principal results of the analysis of features ...

    • Artificial neural networks as emerging tools for earthquake detection 

      Rojas, Otilio; Otero Calviño, Beatriz; Alvarado, Leonardo; Mus, Sergi; Tous Liesa, Rubén (2019)
      Article
      Accés obert
      As seismic networks continue to spread and monitoring sensors become more ef¿cient, the abundance of data highly surpasses the processing capabilities of earthquake interpretation analysts. Earthquake catalogs are fundamental ...

    • Assessment of damage potential of seismic ground motions 

      Aguilar-Meléndez, Armando; De la Puente, Josep; Monterrubio-Velasco, Marisol; Rojas, Otilio; Moya-Sánchez, E. Ulises; Castillo-Reyes, Octavio (Barcelona Supercomputing Center, 2019-05-07)
      Text en actes de congrés
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    • Calibration of absorbing boundary layers for geoacoustic wave modeling in pseudo-spectral time-domain methods 

      Spa Carvajal, Carlos; Rojas, Otilio; Puente, Josep de la (Copernicus Publications, 2023)
      Article
      Accés obert
      This paper develops a calibration methodology of the artificial absorbing techniques typically used by Fourier pseudo-spectral time-domain (PSTD) methods for geoacoustic wave simulations. Specifically, we consider the ...

    • Compact finite difference modeling of 2-D acoustic wave propagation 

      Córdova, Luis; Rojas, Otilio; Otero Calviño, Beatriz; Castillo, Jose (2016-03-15)
      Article
      Accés obert
      We present two fourth-order compact finite difference (CFD) discretizations of the velocity–pressure formulation of the acoustic wave equation in 2-D rectangular grids. The first method uses standard implicit CFD on nodal ...

    • Comparison of expansion-based explicit time-integration schemes for acoustic wave propagation 

      Spa, Carlos; Rojas, Otilio; Puente, Josep de la (Society of Exploration Geophysicists, 2020-04-14)
      Article
      Accés obert
      We have developed a von Neumann stability and dispersion analysis of two time-integration techniques in the framework of Fourier pseudospectral (PS) discretizations of the second-order wave equation. The first technique ...

    • High order methods for acoustic scattering: Coupling farfield expansions ABC with deferred-correction methods 

      Villamizar, Vianey; Grundvig, Dane; Rojas, Otilio; Acosta, Sebastian (Elsevier, 2020)
      Article
      Accés obert
      Arbitrary high order numerical methods for time-harmonic acoustic scattering problems originally defined on unbounded domains are constructed. This is done by coupling recently developed high order local absorbing boundary ...

    • Long short-term memory networks for earthquake detection in Venezuelan regions 

      Mus León, Sergi; Gutiérrez Escobar, Norma; Tous Liesa, Rubén; Otero Calviño, Beatriz; Cruz de la Cruz, Stalin Leonel; Llácer Giner, David; Alvarado Bermúdez, Leonardo; Rojas, Otilio (Springer, 2019)
      Comunicació de congrés
      Accés obert
      Reliable earthquake detection and location algorithms are necessary to properly catalog and analyze the continuously growing seismic records. This paper reports the results of applying Long Short-Term Memory (LSTM) networks ...

    • Low dispersive modeling of Rayleigh waves on partly staggered grids 

      Rojas, Otilio; Otero Calviño, Beatriz; Castillo, José; Day, Steven (2013-10-01)
      Article
      Accés restringit per política de l'editorial
      In elastic media, finite-difference (FD) implementations of free-surface (FS) boundary conditions on partly staggered grid (PSG) use the highly dispersive vacuum formulation (VPSG). The FS boundary is embedded into a ...

    • Mimetic Operators for Seismic Exploration 

      de la Puente, Josep; Rojas, Otilio; Ferrer, Miguel; Kormann, Jean (European Association of Geoscientists and Engineers, 2016-05-31)
      Text en actes de congrés
      Accés obert
      Mimetic operators are a kind of discrete operators which, on staggered grids, can accomplish "mimetic" properties analogous to their continuous counterparts. Furthermore, they can attain identical convergence order everywhere ...

    • Modeling seismic wave propagation using staggered-grid mimetic finite differences 

      Solano, Freysimar; Guevara-Jordan, Juan; González, Carlos; Rojas, Otilio; Otero Calviño, Beatriz (2017-04-12)
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      Accés obert
      Mimetic finite difference (MFD) approximations of continuous gradient and divergente operators satisfy a discrete version of the Gauss-Divergente theorem on staggered grids. On the mimetic approximation of this integral ...

    • Synthetic seismicity distribution in Guerrero–Oaxaca subduction zone, Mexico, and its implications on the role of asperities in Gutenberg–Richter law 

      Monterrubio Velasco, Marisol; Zúñiga, F. Ramón; Rodríguez-Pérez, Quetzalcoat; Rojas, Otilio; Aguilar-Meléndez, Armando; Puente, Josep de la (Copernicus Publications, 2020)
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      Seismicity and magnitude distributions are fundamental for seismic hazard analysis. The Mexican subduction margin along the Pacific Coast is one of the most active seismic zones in the world, which makes it an optimal ...

    • Toward an automatic full-wave inversion: Synthetic study cases 

      Kormann, Jean; Rodriguez, Juan E.; Gutiérrez, Natalia; Ferrer, Miguel; Rojas, Otilio; de la Puente, Josep; Hanzich, Mauricio; Cela, Jose M. (Society of Exploration Geophysicists, 2016-12)
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      Accés obert
      Full-waveform inversion (FWI) in seismic scenarios continues to be a complex procedure for subsurface imaging that might require extensive human interaction in terms of model setup, constraints, and data preconditioning. ...