Results 81 to 90 of about 114,423 (180)

Free boundary problems describing two-dimensional pulse recycling and motion in semiconductors

, 2003
An asymptotic analysis of the Gunn effect in two-dimensional samples of bulk n-GaAs with circular contacts is presented. A moving pulse far from contacts is approximated by a moving free boundary separating regions where the electric potential solves a ...
A.F. Volkov, B. Willing, D.Adalsteinsson, D.L. Chopp, F. J. Higuera, F.J. Higuera, H. Kroemer, J.A. Sethian, J.A. Sethian, J.B. Gunn, L. L. Bonilla, L.L. Bonilla, L.L. Bonilla, L.L. Bonilla, R. Escobedo   +14 more
core   +1 more source

Optimal Sampling-Based Motion Planning under Differential Constraints: the Drift Case with Linear Affine Dynamics

, 2015
In this paper we provide a thorough, rigorous theoretical framework to assess optimality guarantees of sampling-based algorithms for drift control systems: systems that, loosely speaking, can not stop instantaneously due to momentum.
Janson, Lucas, Pavone, Marco, Schmerling, Edward   +2 more
core   +1 more source

EIKONAL-BASED MODELS OF RANDOM TESSELLATIONS

Image Analysis and Stereology, 2019
In this article, we propose a novel, efficient method for computing a random tessellation from its vectorial representation at each voxel of a discretized domain.
Bruno Figliuzzi
doaj   +1 more source

Convergence of a Generalized Fast Marching Method for a non-convex eikonal equation [PDF]

, 2008
International audienceWe present a new Fast Marching algorithm for a non-convex eikonal equation modeling front evolutions in the normal direction. The algorithm is an extension of the Fast Marching Method since the new scheme can deal with a \emph{time ...
Carlini, Elisabetta, Falcone, Maurizio, Forcadel, Nicolas, Monneau, Régis   +3 more
core   +2 more sources

Microseismic P-Wave Travel Time Computation and 3D Localization Based on a 3D High-Order Fast Marching Method. [PDF]

Sensors (Basel), 2021
Li Y, Wang J, Wang Z, Sui Q, Xiong Z.
europepmc   +1 more source

Fast-Marching Methods for Curvature Penalized Shortest Paths [PDF]

Journal of Mathematical Imaging and Vision, 2017
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source

Virtualizing clinical cases of atrial flutter in a fast marching simulation including conduction velocity and ablation scars

Current Directions in Biomedical Engineering, 2015
Diagnosis of atrial flutter caused by ablation of atrial fibrillation is complex due to ablation scars. This paper presents an approach to replicate the clinically measured flutter circuit in a dynamic computer model.
Trächtler J., Oesterlein T., Loewe A., Poremba E., Luik A., Schmitt C., Dössel O.   +6 more
doaj   +1 more source

Fast marching method-based bent-ray tracing for three-dimensional velocity imaging in mines

Rock Mechanics Bulletin
Three-dimensional (3D) seismic velocity imaging is crucial for understanding rock mass stress and structures in mining. Conventional straight-ray tomography suffers from ray-path mismatches with true wavefield propagation in complex media, leading to ...
Jie Yang, Xueyi Shang, Linghao Liu, Yi Wang, Xibing Li   +4 more
doaj   +1 more source

基于相速度预测的FMM弹性TTI介质qP波射线追踪

Dizhen xuebao
快速准确地计算走时和射线路径是实现地震成像和反演的关键。在各向异性介质中，地震波的传播速度会随传播方向的变化而变化，这使得求解各向异性条件程函方程时，相速度的精确估计和计算变得非常复杂和困难，进而影响各向异性介质中走时和射线路径的计算精度和效率。为此，提出了一种基于相速度预测的射线追踪方法，该方法根据波的传播规律以及斯奈尔方程，推导出一种相速度预测公式，解决了各向异性条件程函方程中相速度求解困难的问题，实现了快速稳定的射线追踪。数值算例表明，本文所提出的改进算法明显提高了走时计算精度 ...
Zhiyu Zhang, Xue Dong, Yiqun Zhao
doaj   +1 more source

QUANTIFYING ACTIN FILAMENTS IN MICROSCOPIC IMAGES USING KEYPOINT DETECTION TECHNIQUES AND A FAST MARCHING ALGORITHM. [PDF]

Proc Int Conf Image Proc, 2020
Liu Y, Nedo A, Seward K, Caplan J, Kambhamettu C.   +4 more
europepmc   +1 more source