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[CT152]

CT152 (1/1) : General topics in optics and electromagnetic theory (78A) / Applications of statistical mechanics to specific types of physical systems (82D)

Session Time & Room : 1E (Aug.21, 17:40-19:20) @D405
Type : Contributed Talk
Abstract : Although the MUltiple SIgnal Classification (MUSIC) algorithm has demonstrated suitability as a microwave imaging technique for identifying unknown anomalies, there is a fundamental limit that it requires a switching device to be used which permits a dipole antenna for signal transmission and reception. In this contribution, we design a MUSIC-type imaging function and explore its mathematical structure. Considering the investigated structure, we confirm that the imaging performance is highly dependent on the antenna arrangement and suggest an optimal antenna arrangement to improve the imaging performance. Simulation results with real-data are displayed to support the theoretical result.
Classification : 78A46
Format : Talk at Waseda University
Author(s) :
- Won-Kwang Park (Kookmin University)

Session Time & Room : 1E (Aug.21, 17:40-19:20) @D405
Type : Contributed Talk
Abstract : One of the major issues in real life is evolving vehicular traffic. Recently the totally asymmetric simple exclusion process (TASEP) has been utilized to investigate transport systems. We present a novel generalized two-lane TASEP model with bidirectional movement under a new kind of symmetric coupling between lanes to gain insight into the evolutionary traffic dynamics. We employ the mean-field theory to solve the system theoretically and validate theoretical outcomes through extensively performed Monte Carlo Simulations.
Classification : 82DXX, 82-10, 82M20, 82M60, 82M31, Non-equilibrium Statistical Mechanics, Mathematical Modelling and Simulation, Partial Differential Equations, Stochastic Processes
Format : Talk at Waseda University
Author(s) :
- Atul Kumar Verma (NIT Trichy, India)

Session Time & Room : 1E (Aug.21, 17:40-19:20) @D405
Type : Contributed Talk
Abstract : Measuring strains induced by loads on structural elements is a key component of structural health monitoring $(\text{SHM})$. Current methods are mostly based on localized measurements and offer limited information on distributed strain. We present results on distributed strain monitoring based on electrical impedance tomography $(\text{EIT})$ imaging of a painted, elastic surface coating. The method can extract information on the surface strain field by solving the EIT inverse problem based on measured data.
Classification : 78A46, 78A55, 74Bxx
Format : Talk at Waseda University
Author(s) :
- Mikko Räsänen (University of Eastern Finland)
- Aku Seppänen (University of Eastern Finland)
- Moe Pour-Ghaz (North Carolina State University)
- Jari Kaipio (University of Eastern Finland)

Session Time & Room : 1E (Aug.21, 17:40-19:20) @D405
Type : Contributed Talk
Abstract : This talk aims at introducing a new multi-frequency method to reconstruct width defects in waveguides. Different inverse methods already exist, but those methods are not using some frequencies, called resonant frequencies, where propagation equations are known to be ill-conditioned. Since waves seem very sensible to defects at these particular frequencies, we exploit them instead. Given partial wavefield measurements, we reconstruct slowly varying width defects in a stable way and provide numerical comparisons with existing methods.
Classification : 78A46, 35B34
Format : Talk at Waseda University
Author(s) :
- Angèle Niclas (CMAP - École Polytechnique )

Session Time & Room : 1E (Aug.21, 17:40-19:20) @D405
Type : Contributed Talk
Abstract : Identification of the location of a scattering object from its recorded scattering signature is one of the inverse problems that finds many applications in non-destructive testing. A typical application is a detection and removal of buried land mines. The underlying problem is linked to the discovery of buried objects in a two-layered medium. We present a topological derivatives-based algorithm for detecting a perfectly conducting object in the lower layer of a two-layer unbounded 3D background medium using electromagnetic plane waves. Since the underlying problem is highly ill-posed, most of the existing methods that are qualitative turn out to be quite sensitive to unavoidable medium and measurement noises. Our focus is on designing a direct algorithm based on the topological derivative of an L2-discrepancy function. We perform a rigorous analysis of the proposed algorithm and debate its localization and stability features regarding random medium and measurement noises.
Classification : 78A46, 65J20, Inverse scattering, Maxwell’s equations, Electromagnetic imaging, Topological derivative, Localization, Resolution analysis, Stability analysis, Medium noise, Measurement noise.
Format : Talk at Waseda University
Author(s) :
- Aibike Nagyz (Nazarbayev University)
- Abdul Wahab (Nazarbayev University)