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2007 - 200912010 - 20172
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Konu: Green's function ×

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Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Yayın
    A parallel implementation: Real space Green's function technique
    (Sage Publications, 2007-04) Onat, Berk; Durukanoğlu, Sondan; Dağ, Hasan
    We develop an MPI-based parallel algorithm to implement the real space Green's function technique for calculating the vibrational density of states corresponding to a solid. The Hamiltonian describing the interactions between the atoms within the system is obtained from the embedded atom method. The parallel implementation speeds up calculation by an order of magnitude. The parallel implementation details and results are presented in this paper.
  • Küçük Resim
    Yayın
    Method of moments (MoM) modeling of wave propagation inside a wedge waveguide
    (Applied Computational Electromagnetics Soc, 2014-08) Apaydın, Gökhan; Sevgi, Levent
    Method of Moments (MoM) is used to model guided wave propagation inside a non-penetrable wedge waveguide and the results are validated against analytical mode-based exact solutions.
  • Küçük Resim
    Yayın
    Cross-sectional thermoacoustic imaging using multi-layer cylindrical media
    (IEEE, 2017-11-10) Elmas, Demet; Ünalmış Uzun, Banu; İdemen, Mehmet Mithat; Karaman, Mustafa
    For cross-sectional two-dimensional thermoacustic imaging of breast and brain, we explored solution of the wave equation using layered tissue model consisting of concentric annular layers on a cylindrical cross-section. To obtain the forward and inverse solutions of the thermoacoustic wave equation, we derived the Green's function involving Bessel and Hankel functions by employing the geometrical and acoustic parameters (densities and velocities) of layered media together with temporal initial condition, radiation conditions and continuity conditions on the layers' boundaries. The image reconstruction based on this approach involves the layer parameters as the apriori information which can be estimated from the acquired thermoacoustic data. To test and compare our layered solution with conventional solution based on homogeneous medium assumption, we performed simulations using numerical test phantoms consisting of sources distributed in the layered structure.