Results 1 to 10 of about 20,923 (161)

Analysis of crystallographic phase retrieval using iterative projection algorithms [PDF]

Acta Crystallographica Section D: Structural Biology
For protein crystals in which more than two thirds of the volume is occupied by solvent, the featureless nature of the solvent region often generates a constraint that is powerful enough to allow direct phasing of X-ray diffraction data. Practical implementation relies on the use of iterative projection algorithms with good global convergence ...
Rick P Millane, Richard L Kingston, Millane R P   +2 more
exaly   +5 more sources

Direct Phasing of Protein Crystals with Continuous Iterative Projection Algorithms and Refined Envelope Reconstruction [PDF]

Biomolecules
Direct methods provide a model-free approach to solving the crystallographic phase problem and deliver unbiased atomic structures. However, conventional iterative projection algorithms such as Hybrid Input–Output (HIO) face two critical challenges ...
Yang Liu, Ruijiang Fu, Wu-Pei Su, Hongxing He   +3 more
doaj   +2 more sources

Live Iterative Ptychography with Projection-Based Algorithms

ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
In this work, we demonstrate that the ptychographic phase problem can be solved in a live fashion during scanning, while data is still being collected. We propose a generally applicable modification of the widespread projection-based algorithms such as Error Reduction (ER) and Difference Map (DM).
Simon Welker, Tal Peer, Henry N Chapman   +2 more
exaly   +5 more sources

Multi-Step Inertial Hybrid and Shrinking Tseng’s Algorithm with Meir–Keeler Contractions for Variational Inclusion Problems

Mathematics, 2021
In our paper, we propose two new iterative algorithms with Meir–Keeler contractions that are based on Tseng’s method, the multi-step inertial method, the hybrid projection method, and the shrinking projection method to solve a monotone variational ...
Yuanheng Wang, Mingyue Yuan, Bingnan Jiang   +2 more
doaj   +1 more source

Block-Iterative Algorithms with Underrelaxed Bregman Projections [PDF]

SIAM Journal on Optimization, 2002
The authors consider the convex feasibility problem of finding a point of the set \(C=\bigcap_{i=1}^{m} C_{i}\) where each \(C_{i}\) is a convex closed subset of \(R^{n}\). The usual block-iterative algorithms for this problem are based on the sequential orthogonal projections with possible relaxations.
Yair Censor, Gabor T. Herman
openaire   +1 more source

Improvement of depiction of the intracranial arteries on brain CT angiography using deep learning reconstruction

Journal of Integrative Neuroscience, 2021
To evaluate the ability of a commercialized deep learning reconstruction technique to depict intracranial vessels on the brain computed tomography angiography and compare the image quality with filtered-back-projection and hybrid iterative ...
Chuluunbaatar Otgonbaatar, Jae-Kyun Ryu, Seonkyu Kim, Jung Wook Seo, Hackjoon Shim, Dae Hyun Hwang   +5 more
doaj   +1 more source

Convergence of Some Iterative Algorithms for System of Generalized Set-Valued Variational Inequalities

Journal of Function Spaces, 2021
In this article, we consider and study a system of generalized set-valued variational inequalities involving relaxed cocoercive mappings in Hilbert spaces. Using the projection method and Banach contraction principle, we prove the existence of a solution
M. Akram, Aysha Khan, M. Dilshad
doaj   +1 more source

Iterative algorithms with seminorm‐induced oblique projections [PDF]

Abstract and Applied Analysis, 2003
A definition of oblique projections onto closed convex sets that use seminorms induced by diagonal matrices which may have zeros on the diagonal is introduced. Existence and uniqueness of such projections are secured via directional affinity of the sets with respect to the diagonal matrices involved. A block‐iterative algorithmic scheme for solving the
Censor, Yair, Elfving, Tommy
openaire   +3 more sources

Aggregation-iterative analogues and generalizations of projection-iterative methods

Karpatsʹkì Matematičnì Publìkacìï, 2013
Aggregation-iterative algorithms for linear operator equations are constructed and investigated. These algorithms cover methods of iterative aggregation and projection-iterative methods.
Shuvar B.F., Obshta A.F., Kopach M.I.
doaj   +3 more sources

Iterative List Patterned Reed-Muller Projection Detection-Based Packetized Unsourced Massive Random Access

Sensors, 2023
In this paper, we consider a slot-controlled coded compressed sensing protocol for unsourced massive random access (URA) that concatenates a shared patterned Reed–Muller (PRM) inner codebook to an outer error-correction code.
Wenjiao Xie, Runhe Tian, Huisheng Zhang
doaj   +1 more source