19,194 research outputs found
On CSCS-based iteration methods for Toeplitz system of weakly nonlinear equations
AbstractFor Toeplitz system of weakly nonlinear equations, by using the separability and strong dominance between the linear and the nonlinear terms and using the circulant and skew-circulant splitting (CSCS) iteration technique, we establish two nonlinear composite iteration schemes, called Picard-CSCS and nonlinear CSCS-like iteration methods, respectively. The advantage of these methods is that they do not require accurate computation and storage of Jacobian matrix, and only need to solve linear sub-systems of constant coefficient matrices. Therefore, computational workloads and computer storage may be saved in actual implementations. Theoretical analysis shows that these new iteration methods are local convergent under suitable conditions. Numerical results show that both Picard-CSCS and nonlinear CSCS-like iteration methods are feasible and effective for some cases
DiffusionDepth: Diffusion Denoising Approach for Monocular Depth Estimation
Monocular depth estimation is a challenging task that predicts the pixel-wise
depth from a single 2D image. Current methods typically model this problem as a
regression or classification task. We propose DiffusionDepth, a new approach
that reformulates monocular depth estimation as a denoising diffusion process.
It learns an iterative denoising process to `denoise' random depth distribution
into a depth map with the guidance of monocular visual conditions. The process
is performed in the latent space encoded by a dedicated depth encoder and
decoder. Instead of diffusing ground truth (GT) depth, the model learns to
reverse the process of diffusing the refined depth of itself into random depth
distribution. This self-diffusion formulation overcomes the difficulty of
applying generative models to sparse GT depth scenarios. The proposed approach
benefits this task by refining depth estimation step by step, which is superior
for generating accurate and highly detailed depth maps. Experimental results on
KITTI and NYU-Depth-V2 datasets suggest that a simple yet efficient diffusion
approach could reach state-of-the-art performance in both indoor and outdoor
scenarios with acceptable inference time
Performance characteristics of an HTS linear synchronous motor with HTS bulk magnet secondary
A single-sided high-temperature superconducting (HTS) linear synchronous motor (HTSLSM) with an HTS bulk magnet array as its secondary has been developed, and a split pulse coil magnetization system is used to magnetize the secondary HTS bulks with alternating magnetic poles. The electromagnetic parameters of the HTSLSM have been calculated to verify its performance. The HTSLSM is incorporated with a developed control system based on the voltage space vector pulsewidth modulation strategy implemented by a computer-software-controlled platform. A compositive experimental testing system has also been developed to measure the thrust and normal force of the HTSLSM. The traits of the thrust and normal force have been comprehensively identified experimentally, and the results from the experiments and analysis would benefit the electromagnetic design and the control scheme development for the HTSLSM. © 2006 IEEE
- …