Learn More
Aiming at the difficulty of choosing filtering parameters of Non-Local Means (NLM) denoising algorithm for Cone-Beam Computed Tomography (CBCT) projection images, an adaptive NLM denoising algorithm is proposed. First, a simplified noise estimation method based on sub-block division is proposed to replace the approach of designating the background region,(More)
Motion of particles in two-phase flow between two rotary pads is simulated with coupled lattice Boltzmann method (LBM) and discrete element method (DEM), in which the LBM is used for calculating the fluid flow, while the DEM for accounting for the interaction between the moving particles, both the particles and the pads are constructed by the 'boundary' in(More)
With the rapid development of civil aviation, air traffic management system plays a more important role in ensuring aviation safety, and hence there is an urgent need to use information technology to improve analysis level and efficiency of aviation safety information. In this paper, an air traffic management safety database analysis system is developed. It(More)
—The formation principle of X-ray Computed Tomography (CT) beam hardening and the effect law of noise on the correction result were studied. The suppression methods of noise impact in the process of beam hardening correction were presented from the following three aspects: First of all, aiming at the adverse factors of original beam hardening data, such as(More)
Cardiac reentry is one of the important factors to induce arrhythmias. It could lead to ventricular tachycardia (VT) or even fibrillation (VF), resulting in sudden cardiac death. With the wide use of computer in the quantitative study of electrophysiology, the three-dimensional virtual heart for simulations needs to be developed imminently in computer. In(More)