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Full-waveform inversion algorithm for interpreting crosshole radar data: a theoretical approach
Seiichiro Kuroda,Mutsuo Takeuchi,김희준 한국지질과학협의회 2007 Geosciences Journal Vol.11 No.3
Ground-penetrating radar is a useful tool for civiland environmental engineering fields because of its high resolvingpower and non-destructive measurements. This paper presents amethod of full-waveform inversion of borehole radar data forimaging permittivity structures. The inversion algorithm is basedon a conjugate gradient search for the minimum of an error func-tional relating to the difference betwen measured and predicteddata. A small model perturbation in the functional can be efficientlycalculated by propagating the data eror back into the model inreverse time and correlating the field generated by the back-prop-agation with the corresponding incident field at each point. Afinite difference time domain (FDTD) method is used for solvingMaxwells equations to obtain incident electromagnetic wavefields.Back-propagated wavefields satisfy adjoint Maxwells equations,which are stable in reverse time and can be solved by the sameconfiguration, thereby demonstrating its capability to reconstructpermittivity structures. Tests on a two-dimensional synthetic modelproduce good images of target scatterers and show stable convergence.
Tomokazu Mishima,Yujiro Takeuchi,Mutsuo Nakaoka 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a new soft switching PWM non-isolated boost DC?DC converter embedding an edge-resonant switched capacitor (ER-SWC) modular. The DC?DC converter treated here can achieve a high frequency ZCS turn-on and ZVS turn-off operations in active switches and minimization of a reverse recovering current in the freewheeling diode under DCM including CRM in the input current. Those advantageous properties enable a wide range of soft switching operations achievable together with a high step-up voltage conversion ratio. For demonstrating the effectiveness of the new soft switching PWM boost DC-DC converter, a 1㎾?40 ㎑ laboratory prototype is evaluated in experiments, then performances of the proposed soft switching PWM boost DC?DC converter are discussed from a practical point of view.