Wyniki wyszukiwania dla: FDTD MODELLING

• APPLIED MATHEMATICAL MODELLING

  Czasopisma

  ISSN: 0307-904X , eISSN: 1872-8480

• JOURNAL OF MOLECULAR MODELING

  Czasopisma

  ISSN: 1610-2940 , eISSN: 0948-5023

• 3D Macromodels in the FDTD filter analysis.

  Publikacja

  • Ł. Kulas
  • M. Mrozowski

  - Rok 2004

  W artykule pokazane jest zastosowanie makromodeli 3D do analizy filtrow metoda FDTD. Makromodele tworzone są w oparciu o opis objętości metodą FDFD, a następnie redukcję równań stanu metodą ENOR. Metoda pozwala na uzyskanie dużych dokładności przy czasie obliczeń zbliżonym do siatki podstawowej.

• Stability of the FDTD scheme containing macromodels.

  Publikacja

  • Ł. Kulas
  • M. Mrozowski

  - Rok 2004

  Zaprezentowano analizę stabilnościową algorytmu różnic skończonych w dziedzinie czasu zawierającego makromodele. Pokazano, że dla uzyskania stabilnych makromodeli stabilność schematu FDTD połączonego z makromodelami zależy od sposobu przeprowadzenia interpolacji pól granicznych. Maksymalny dozwolony krok czasowy jest dużo większy niż dla subgriddingu.

• ECONOMIC MODELLING

  Czasopisma

  ISSN: 0264-9993 , eISSN: 1873-6122

• Advanced Macromodel Matrix Structure Cloning for FDTD

  Publikacja

  • J. Podwalski
  • Ł. Kulas
  • M. Mrozowski

  - Rok 2010

  We propose an improved macromodel-based techniquefor efficient analysis of the structures based on PhotonicCrystals (PhC). The technique involves a new structure of thecoupling matrix and advanced cloning of not only the macromodel􀀀 matrices, but also the coupling matrices SE and SH.The method allows one to shorten considerably the preprocessingtime, the RAM usage and also the iterating speed of performingFDTD. With this...

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• Optimization of a FDTD code for graphical processing units

  Publikacja

  • P. Sypek
  • M. Mrozowski

  - Rok 2008

  Artykuł prezetuje implementację algorytmu FDTD w postaci jawnej przeznaczonej dla kart graficznych. Wykazany został wzrost efektywności obliczeń numerycznych w odniesieniu do implementacji przeznaczonej dla procesora komputerowego.

• Model order reduction for subgridding in fdtd scheme

  Publikacja

  • Ł. Kulas
  • P. Sypek
  • J. Podwalski
  • M. Mrozowski

  - Rok 2006

  W artykule zaprezentowana została technika pozwalająca na uzyskanie wysokiej rozdzielczości w metodzie FDTD. Prezentowany algorytm jest połączeniem metod redukcji rzędu modelu i lokalnych zagęszczeń zaimplementowanych do FDTD. Pozwala to zmniejszyć liczbę użytych zmiennych stanu, a także skrócić krok czasowy, co skutkuje znacznie krótszym czasem symulacji, niż w przypadku klasycznej metody FDTD.

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• JOURNAL OF MOLECULAR GRAPHICS & MODELLING

  Czasopisma

  ISSN: 1093-3263 , eISSN: 1873-4243

• Implementation of matrix-type FDTD algorithm on a graphics accelerator

  Publikacja

  • A. Dziekoński
  • P. Sypek
  • Ł. Kulas
  • M. Mrozowski

  - Rok 2008

  Artykuł prezetuje implementację algorytmu FDTD w postaci macierzowej przeznaczonej dla kart graficznych. Wykazany został wzrost efektywności obliczeń numerycznych w odniesieniu do implementacji przeznaczonej dla procesora komputerowego.

• Hybridization of the FDTD method with use of the discrete Green's function

  Publikacja

  • T. Stefański

  - Rok 2014

  In this contribution, a hybrid technique is presented which combines the finite-difference time-domain (FDTD) method and the discrete Green's function (DGF) formulation of this method. FDTD is a powerful technique for the analysis of complex penetrable objects but its application is not efficient when the computational domain includes many free-space cells. Therefore, the hybrid method was developed which is applicable to complex...

• Accuracy of the Discrete Green's Function Formulation of the FDTD Method

  Publikacja

  • T. Stefański

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2013

  This paper reports an evaluation of the accuracy of the discrete Greens function (DGF) formulation of the finite-difference time-domain (FDTD) method. Recently, the closed-form expression for the DGF and its efficient numerical implementation were presented, which facilitates applications of the DGF in FDTD simulations of radiation and scattering problems. So far, the accuracy of the DGF formulation of the FDTD method has been...

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• Windowing of the Discrete Green's Function for Accurate FDTD Computations

  Publikacja

  • T. Stefański

  - Rok 2013

  The paper presents systematic evaluation of the applicability of parametric and nonparametric window functions for truncation of the discrete Green's function (DGF). This function is directly derived from the FDTD update equations, thus the FDTD method and its integral discrete formulation can be perfectly coupled using DGF. Unfortunately, the DGF computations require processor time, hence DGF has to be truncated with appropriate...

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• A technique of stabilizing FDTD-subgridding algorithm using reciprocity principle

  Publikacja

  • Ł. Kulas
  • M. Mrozowski

  - Rok 2008

  W artykule przedstawiono wykorzystanie zasady wzajemności w procesie stabilizacji zagęszczania siatki dla fdtd. Metoda ta oryginalnie służyła tylko do sprawdzenia stabilności algorytmów zagęszczających siatki fdtd, jednak pozwala ona na zmianę współczynnika sprzężenia pomiędzy polami występującymi na brzegach w ten sposób, że algorytm siatkowania jest stabilny. Zaprezentowana metoda została zweryfikowana testami numerycznymi pod...

• OpenGL accelerated method of the material matrix generation for FDTD simulations

  Publikacja

  • S. Orłowski
  • T. Stefański

  - Rok 2014

  This paper presents the accelerated technique of the material matrix generation from CAD models utilized by the finite-difference time-domain (FDTD) simulators. To achieve high performance of these computations, the parallel-processing power of a graphics processing unit was employed with the use of the OpenGL library. The method was integrated with the developed FDTD solver, providing approximately five-fold speedup of the material...

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• Implementation of FDTD-Compatible Green's Function on Graphics Processing Unit

  Publikacja

  • T. Stefański
  • K. Krzyżanowska

  - IEEE Antennas and Wireless Propagation Letters - Rok 2012

  In this letter, implementation of the finite-difference time domain (FDTD)-compatible Green's function on a graphics processing unit (GPU) is presented. Recently, closed-form expression for this discrete Green's function (DGF) was derived, which facilitates its applications in the FDTD simulations of radiation and scattering problems. Unfortunately, implementation of the new DGF formula in software requires a multiple precision...

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• Acceleration of the DGF-FDTD method on GPU using the CUDA technology

  Publikacja

  • T. Dziubak
  • M. Wiktor
  • S. Orłowski
  • T. Stefański

  - Rok 2015

  We present a parallel implementation of the discrete Green's function formulation of the finite-difference time-domain (DGF-FDTD) method on a graphics processing unit (GPU). The compute unified device architecture (CUDA) parallel computing platform is applied in the developed implementation. For the sake of example, arrays of Yagi-Uda antennas were simulated with the use of DGF-FDTD on GPU. The efficiency of parallel computations...

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• Au–Si plasmonic platforms: synthesis, structure and FDTD simulations

  Publikacja

  • A. Gapska
  • M. S. Łapiński
  • P. Syty
  • W. Sadowski
  • J. E. Sienkiewicz
  • B. Kościelska

  - Beilstein Journal of Nanotechnology - Rok 2018

  Plasmonic platforms based on Au nanostructures have been successfully synthesized by directional solidification of a eutectic from Au and the substrate. In order to determine homogeneous shape and space distribution, the influence of annealing conditions and the initial thickness of the Au film on the nanostructures was analyzed. For the surface morphology studies, SEM and AFM measurements were performed. The structure of platforms...

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• Fast implementation of FDTD-compatible green's function on multicore processor

  Publikacja

  • T. Stefański

  - IEEE Antennas and Wireless Propagation Letters - Rok 2012

  In this letter, numerically efficient implementation of the finite-difference time domain (FDTD)-compatible Green's function on a multicore processor is presented. Recently, closed-form expression of this discrete Green's function (DGF) was derived, which simplifies its application in the FDTD simulations of radiation and scattering problems. Unfortunately, the new DGF expression involves binomial coefficients, whose computations...

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• Provisional model technique in the FDTD analysis of high-q resonators.

  Publikacja

  • P. Kozakowski
  • A. Lamęcki
  • M. Mrozowski

  - Rok 2004

  W artykule zaproponowano nową metodą wyznaczania wartości współczynnika dobroci oraz częstotliwości rezonansowych rezonatorów dużej dobroci na podstawie odpowiedzi układów w dziedzinie czasu. Przebiegi czasowe, będące rezultatem symulacji pełnofalowej układów, modelowane są dwukrotnie. Pierwszy model, tzw. model prowizoryczny, wykorzystywany jest do przedłużenia oryginalnego ciągu czasowego w celu zapobieżenia zniekształceniu wspomnianego...

• STATISTICAL MODELLING

  Czasopisma

  ISSN: 1471-082X , eISSN: 1477-0342

• Journal of Chemical Information and Modeling

  Czasopisma

  ISSN: 1549-9596 , eISSN: 1549-960X

• How to render FDTD computations more effective using agraphics accelerator.

  Publikacja

  • P. Sypek
  • A. Dziekoński
  • M. Mrozowski

  - IEEE TRANSACTIONS ON MAGNETICS - Rok 2009

  Graphics processing units (GPUs) for years have been dedicated mostly to real time rendering. Recently leading GPU manufactures have extended their research area and decided to support also graphics computing. In this paper, we describe an impact of new GPU features on development process of an efficient finite difference time domain (FDTD) implementation.

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• FDTD Simulations on Disjoint Domains with the Use of Discrete Green's Function Diakoptics

  Publikacja

  • T. Stefański
  • T. Dziubak

  - Rok 2017

  A discrete Green's function (DGF) approach to couple disjoint domains in the finite-difference time-domain (FDTD) grid is developed. In this method, total-field/scattered-field (TFSF) FDTD domains are associated with simulated objects whereas the interaction between them is modeled with the use of the DGF propagator. Hence, source and scatterer are simulated in separate domains and updating of vacuum cells, being of little interest,...

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• Parallel implementation of the DGF-FDTD method on GPU Using the CUDA technology

  Publikacja

  • T. Stefański
  • T. Dziubak
  • S. Orłowski

  - Rok 2016

  The discrete Green's function (DGF) formulation of the finite-difference time-domain method (FDTD) is accelerated on a graphics processing unit (GPU) by means of the Compute Unified Device Architecture (CUDA) technology. In the developed implementation of the DGF-FDTD method, a new analytic expression for dyadic DGF derived based on scalar DGF is employed in computations. The DGF-FDTD method on GPU returns solutions that are compatible...

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• Low order autoregressive (AR) models for FDTD analysis of microwave filters.

  Publikacja

  • P. Kozakowski
  • M. Mrozowski

  - Journal of Telecommunications and Information Technology - Rok 2002

  Artykuł opisuje zastosowanie modeli AR w celu poprawy efektywności analizy struktur filtrujących metodą różnic skończonych w dziedzinie czasu (FD-TD). Opisanych jest szereg kryteriów pozwalających na automatyczne tworzenie modeli AR sygnałów czasowych, w tym wybór fragmentu odpowiedzi układu stanowiący podstawę ekstrakcji współczynników modelu, współczynnika decymacji oraz rzędu modelu. Skuteczność wprowadzonych kryteriów...

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• Systems Analysis Modelling Simulation

  Czasopisma

  ISSN: 0232-9298

• Acceleration of the Discrete Green’s Function Formulation of the FDTD Method Based on Recurrence Schemes

  Publikacja

  • J. Gulgowski
  • T. Stefański

  - Rok 2019

  In this paper, we investigate an acceleration of the discrete Green's function (DGF) formulation of the FDTD method (DGF-FDTD) with the use of recurrence schemes. The DGF-FDTD method allows one to compute FDTD solutions as a convolution of the excitation with the DGF kernel. Hence, it does not require to execute a leapfrog time-stepping scheme in a whole computational domain for this purpose. Until recently, the DGF generation...

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• Discrete Green's function approach to disjoint domain simulations in 3D FDTD method

  Publikacja

  • T. Stefański

  - ELECTRONICS LETTERS - Rok 2013

  A discrete Green’s function (DGF) approach to couple 3D FDTD subdomains is developed. The total-field/scattered-field subdomains are simulated using the explicit FDTD method whilst interaction between them is computed as a convolution of the DGF with equivalent current sources measured over Huygens surfaces. In the developed method, the DGF waveforms are truncated using the Hann’s window. The error varies in the range -65 to -40...

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• Crank–Nicolson FDTD Method in Media Described by Time-Fractional Constitutive Relations

  Publikacja

  • D. Trofimowicz
  • T. Stefański
  • J. Gulgowski

  - Rok 2024

  In this contribution, we present the Crank-Nicolson finite-difference time-domain (CN-FDTD) method, implemented for simulations of wave propagation in media described by time-fractional (TF) constitutive relations. That is, the considered constitutive relations involve fractional-order (FO) derivatives based on the Grünwald-Letnikov definition, allowing for description of hereditary properties and memory effects of media and processes....

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• FDTD Method for Electromagnetic Simulations in Media Described by Time-Fractional Constitutive Relations

  Publikacja

  • P. Pietruszka
  • T. Stefański
  • J. Gulgowski

  - Applied Sciences-Basel - Rok 2023

  In this paper, the finite-difference time-domain (FDTD) method is derived for electromagnetic simulations in media described by the time-fractional (TF) constitutive relations. TF Maxwell’s equations are derived based on these constitutive relations and the Grünwald–Letnikov definition of a fractional derivative. Then the FDTD algorithm, which includes memory effects and energy dissipation of the considered media, is introduced....

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• Multidiscipline Modeling in Materials and Structures

  Czasopisma

  ISSN: 1573-6105 , eISSN: 1573-6113

• Reinforcement Learning Algorithm and FDTD-based Simulation Applied to Schroeder Diffuser Design Optimization

  Publikacja

  • A. Kurowski
  • B. Kostek

  - IEEE Access - Rok 2021

  The aim of this paper is to propose a novel approach to the algorithmic design of Schroeder acoustic diffusers employing a deep learning optimization algorithm and a fitness function based on a computer simulation of the propagation of acoustic waves. The deep learning method employed for the research is a deep policy gradient algorithm. It is used as a tool for carrying out a sequential optimization process the goal of which is...

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• Implementation of FDTD-compatible Green's function on heterogeneous CPU-GPU parallel processing system

  Publikacja

  • T. Stefański

  - Progress in Electromagnetics Research-PIER - Rok 2013

  This paper presents an implementation of the FDTD-compatible Green's function on a heterogeneous parallel processing system. The developed implementation simultaneously utilizes computational power of the central processing unit (CPU) and the graphics processing unit (GPU) to the computational tasks best suited to each architecture. Recently, closed-form expression for this discrete Green's function (DGF) was derived, which facilitates...

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• COMBUSTION THEORY AND MODELLING

  Czasopisma

  ISSN: 1364-7830 , eISSN: 1741-3559

• Journal of Modelling in Management

  Czasopisma

  ISSN: 1746-5664 , eISSN: 1746-5672

• Journal of Choice Modelling

  Czasopisma

  ISSN: 1755-5345

• Journal of Language Modelling

  Czasopisma

  ISSN: 2299-8470 , eISSN: 2299-856X

• Modelling, Measurement and Control A

  Czasopisma

  ISSN: 1259-5985

• Mathematical Modelling and Control

  Czasopisma

  eISSN: 2767-8946

• Infectious Disease Modelling

  Czasopisma

  ISSN: 2468-0427

• Dependence Modeling

  Czasopisma

  ISSN: 2300-2298

• Parallel Implementation of the Discrete Green's Function Formulation of the FDTD Method on a Multicore Central Processing Unit

  Publikacja

  • T. Stefański
  • S. Orłowski
  • B. Reichel

  - RADIOENGINEERING - Rok 2014

  Parallel implementation of the discrete Green's function formulation of the finite-difference time-domain (DGF-FDTD) method was developed on a multicore central processing unit. DGF-FDTD avoids computations of the electromagnetic field in free-space cells and does not require domain termination by absorbing boundary conditions. Computed DGF-FDTD solutions are compatible with the FDTD grid enabling the perfect hybridization of FDTD...

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• Hybrid Technique Combining the FDTD Method and Its Convolution Formulation Based on the Discrete Green's Function

  Publikacja

  • T. Stefański

  - IEEE Antennas and Wireless Propagation Letters - Rok 2013

  In this letter, a technique combining the finite-difference time-domain (FDTD) method and its formulation based on the discrete Green's function (DGF) is presented. The hybrid method is applicable to inhomogeneous dielectric structures that are mutually coupled with wire antennas. The method employs the surface equivalence theorem in the discrete domain to separate the problem into a dielectric domain simulated using the FDTD method...

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• FDTD-Compatible Green's function based on scalar discrete Green's function and multidimensional Z-transform

  Publikacja

  • T. Stefański

  - Rok 2015

  In this contribution, a new formulation of the discrete Green's function (DGF) is presented for the finitedifference time-domain (FDTD) grid. Recently, dyadic DGF has been derived from the impulse response of the discretized scalar wave equation (i.e., scalar DGF) with the use of the multidimensional Z-transform. Its software implementation is straightforward because only elementary functions are involved and a single function...

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• Structure, luminescent properties and FDTD simulation of TeO2-BaO-Bi2O3-Ag:Ln3+ glass-ceramics system

  Publikacja

  • T. Lewandowski
  • M. Walas
  • A. Synak
  • P. Syty
  • J. E. Sienkiewicz
  • R. Kozioł
  • M. S. Łapiński
  • W. Sadowski
  • B. Kościelska

  - JOURNAL OF LUMINESCENCE - Rok 2019

  TeO2-BaO-Bi2O3-Ag glass systems (TBB) co-doped with terbium and europium ions have been successfully synthesized through conventional melt-quenching technique. Heat treatment procedure at 350 °C has been conducted in order to synthesize silver nanoparticles embedded in TBB glass matrix. Structural measurements involved XRD studies that revealed no crystallization of glass structure after heat treatment at elevated temperatures....

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• A New Expression for the 3-D Dyadic FDTD-Compatible Green's Function Based on Multidimensional Z-Transform

  Publikacja

  • T. Stefański

  - IEEE Antennas and Wireless Propagation Letters - Rok 2015

  In this letter, a new analytic expression for the time-domain discrete Green's function (DGF) is derived for the 3-D finite-difference time-domain (FDTD) grid. The derivation employs the multidimensional Z-transform and the impulse response of the discretized scalar wave equation (i.e., scalar DGF). The derived DGF expression involves elementary functions only and requires the implementation of a single function in the multiple-precision...

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• Recurrence scheme for FDTD-compatible discrete Green's function derived based on properties of Gauss hypergeometric function

  Publikacja

  • J. Gulgowski
  • T. Stefański

  - JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS - Rok 2019

  In this paper, the formulation of one-dimensional FDTD (Finite-difference time-domain)-compatible discrete Green's function (DGF) is derived based on the Gauss hypergeometric function (GHF). The properties of GHF make it possible to derive the recurrence scheme only in the time domain for the DGF generation. Furthermore, this recurrence scheme is valid for any stable time-step size and can be implemented using standard numerical...

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• INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS

  Czasopisma

  ISSN: 0894-3370 , eISSN: 1099-1204

• Cezary Orłowski prof. dr hab. inż.

  Osoby