880 results about "Grid partition" patented technology

A structural and functional model for a lung or similar organ is virtually defined by encoding aspects of branching passageways. Larger passageways that are visible in medical images are surface mesh fitted to the anatomical surface geometry. Smaller distal passageways, beyond a given number of branch generations, are modeled by inference as linear passages with nominal diameters and branching characteristics, virtually filling the space within the outer envelope of the organ. The model encodes finite volumetric elements for elasticity and compliance in passageway walls, and for local pressure and flow conditions in passageway lumens during respiration. The modeling can assess organ performance, help to plan surgery or therapy, determine likely particle deposition, assess respiratory pharmaceutical dosing, and otherwise represent structural and functional organ parameters.

The invention discloses a method and a system for dynamically updating geographic space data based on a remote sensing image. The method comprises the steps of preprocessing an image, identifying change information, performing filtering to eliminate noise, extracting the boundary of a changed area, generating a vector boundary diagram of an image change feature, regularizing the boundary of the feature, segmenting update data based on the principle of quad-tree spatial index to locate the changed area quickly, identifying the change type of elements based on a neural decision tree method, extracting the change type, and updating and storing the change information in an original database. According to the invention, a simple, quick and accurate change detection method is obtained. By adoption of the quad-tree grid partition mode, the speed and precision of retrieval are improved. The boundary of the changed area extracted by an IGAC-based extraction method is more accurate.

The invention provides a vehicle demand thermodynamic diagram generation method and a device thereof and relates to the thermodynamic diagram technology field. The method comprises the following steps of carrying out grid division on an electronic map in an assigned area; acquiring order data corresponding to each divided grid; according to an order total amount in the order data of each grid, and based on a preset merging rule, merging the adjacent grids in the electronic map and acquiring an electronic grid map, wherein the preset merging rule includes rules of the order total amount in the grids and an adjacent position relation among the grids; according to the order data, taking an order generation place of an internal portion edge of each grid in the electronic grid map as a peak, and connecting each peak so as to generate a polygon area; and coloring the polygon area according to a vehicle demand and acquiring a vehicle demand thermodynamic diagram of a current area. In the invention, accuracy and practicality of the vehicle demand thermodynamic diagram are increased.

The invention discloses a method and a device for multicell joint optimization under coverage of a cellular mobile communication network. The method disclosed by the invention comprises the steps of: collecting the position information of all base stations in a target area; performing grid partitioning on the target area; measuring propagation loss from each base station to each grid point; traversing combinations of total emission power and antenna electrical parameters and making statistics on an adverse coverage ratio; and selecting a combination enabling the adverse coverage ratio to be minimal, and feeding optimal excitation current to each antenna. The device disclosed by the invention comprises an information collection module, a gridding processing module, a propagation loss determination module, a traversing solving module and a selecting module. According to the invention, by means of optimizing directional diagrams and emission power of array antennas to realize the multicell joint optimization orienting to an actual propagation environment under network coverage, the adverse coverage of an entire target area is minimal; and the method and the device not only can be applied to the multicell joint optimization orienting to the actual propagation environment under the network coverage, but also can be used for singly correcting the adverse coverage of exceptional cells.

The invention relates to a behavior splicing method of a video scene, so that video scene splicing and behavior splicing of moving objects in different videos can be realized. The method comprises the following steps that: on the basis of image registration, meshing is carried out on a video image so as to form an image block node set and an image block label set; an image block clustering algorithm is utilized to generate an image block label type representative candidate set for each of the image block node; and a two dimensional Markov random field and a three dimensional Markov random fields of the image block node are constructed and solved, so that a static background and a dynamic background are generated; on the basis of extraction of tracks of moving objects, track similarity and position similarity between moving objects of different videos are calculated, so that a splicable property of moving object behaviors is obtained and video alignment is provided at time and space; and a poisson image fusion algorithm is utilized to fuse a panoramic dynamic background video and motions, so that a video scene after behavior splicing is generated.

The invention provides a method for accurately reconstructing a microcosmic finite element grid model of a dissimilar material on the basis of CT (computed tomography) images. According to the method, sequence CT images are acquired through industrial CT, and micro-structural information in the CT images is mapped onto the reconstructed finite element grid model on basis of digitization and threshold segmentation, so that any detailed structural information in the dissimilar material can be represented in the reconstructed model. The method improves the reconstruction accuracy by means of contrast-limited adaptive histogram equalization, median filtering and pixel interpolation, and improves the reconstruction efficiency through image cut and pixel combination. With the method, rectangular (two-dimensional) and cuboid (three-dimensional) unit grid models with higher finite element analysis accuracy are directly reconstructed, error accumulation during reconstruction, grid partition and other links of the existing geometric reconstruction method is avoided, and reconstruction accuracy and efficiency are improved. The method can be widely applied to fields such as performance prediction and optimization design of dissimilar materials.

The invention belongs to the technical field of gear detection and measurement, in particular relates to a gear load wireless monitoring system and an interactive multi-stage gear physical simulation method finished based on the same. The invention overcomes the defects and limitations of the existing gear monitoring and simulation method. The gear load wireless monitoring system comprises an upper computer and a lower computer, wherein the lower computer is internally arranged on a measured gear structure, and the lower computer with a wireless transmission function is in wireless transmission with the upper computer. The interactive multi-stage gear physical simulation method comprises the following steps of: detecting an external field; carrying out gear solid modeling, and carrying out grid partition on the gear solid model by adopting swept mapping; setting boundary conditions; carrying out finite element analysis; and verifying the data subjected to finite element analysis and actual measurement. According to the invention, wireless data transmission and load identification testing schemes are used for correcting the error of CAE (Computer Aided Engineering) analysis so as to master the stress rule of the gear, thereby providing a basis for fatigue life prediction. The system and method provided by the invention have higher practical and economic values.

The invention discloses a non-rigid multiscale object detection method based on a convolutional neural network, which comprises the steps of firstly designing a deep network, performing deep network learning and training for target detection by infrared pedestrian data sets with certain representativeness cvc-09, cvc-14 and self marked small target pedestrian data, wherein the infrared pedestriandata sets have small targets with the pixel being about 20*30 and big target pedestrians at a close range; then designing different detection models based on a hardware platform, and evaluating the detection models. The designed network applies 7*7 grid partition and applies six candidate boxes in allusion to each grid, target area nomination is accomplished, and pedestrian target detection is achieved through classification recognition and location regression analysis. The neural network is applied in the design, and the feature extraction ability of the detection model is increased. The real-time performance of detection is realized based on the idea of grid partition, the number of the candidate boxes is increased by applying data sets with different target scales and multiscale training, and finally the small target detecting ability is enhanced.

The invention provides a method for parallel space query based on grid division and a system of the same. The method comprises the steps that the grid division and numbering are carried out to query space objects and a space scope in which a target space object set is located according to a quad tree; a space fragmented index is constructed for each space object; and according to the number of a minimum grid in the space fragmented index, a target space object which has an intersection relation with the minimum grid corresponding to the query space object is acquired from the target space object set. According to the invention, the quad tree is used for the space grid division and the grid numbering, so that each space object is contained in a corresponding quad tree grid, and thus a boundary object processing problem is eliminated; and meanwhile, according to a space topological relation hidden in a quad tree code, the space objects which obviously cannot satisfy query conditions can be filtered out, so that the candidate target space objects can be pre-filtered, task candidate sets can be reduced, and parallel query efficiency can be increased once again.

The invention discloses a thermal simulation analysis method of a lithium ion battery of a multi-layer flaky structure. The method includes the steps of (1) preparing a battery sample and measuring electrical property data at different environment temperatures, (2) building a finite element battery solid model of a multi-layer structure and carrying out mesh dividing, (3) carrying out material property endowment and adding boundary conditions and initializing conditions of the finite element battery model, and (4) putting a battery in a heat-insulated environment and carrying out a heating experiment and a discharging experiment to achieve key parameter revision and calculation result verification of a thermal simulation analysis model. According to the thermal simulation analysis method of the lithium ion battery of the multi-layer flaky structure, experimenting and finite element modeling are organically combined, by means of a parametric model mode, every diaphragm, positive and negative pole active substance layers and a metal foil layer of the finite element model are all available, experiment results can be used for revising calculation results, and accordingly calculation precision is further guaranteed.

The invention discloses a 3D NAND storage device and a formation method thereof. In the formation method of the 3D NAND storage device, a selective grid sacrificial layer in a first grid partition groove area is disconnected through a first grid partition groove and a plurality of grid partition groove partition areas in the first grid partition groove area, a selective grid sacrificial layer in athrough hole area is disconnected through a selective grid partition area in the through hole area, although the selective grid sacrificial layer on the top of the first grid partition groove area isdisconnected through the first grid partition groove and the grid partition groove partition areas, the sacrificial layer at the bottom of the grid partition groove partition area still remains, namely the sacrificial layers and partition layers in each storage block when the first grid partition groove is formed are still connected together, a stacking structure can be of extremely high supporting strength when the first grid partition groove is formed, and the side wall of the first grid partition groove is unlikely to deform or incline, so that the stability of the feature size of the formed first grid partition groove is guaranteed.

The present invention provides a novel remeshing approach for genus-g meshes that overcomes distortion problems. The proposed approach is based on continuous mapping of a 2D grid on the 3D meshed model. The criteria of the new mesh can be defined directly on the 2D grid. The remeshing is invariant to the original mesh. Due to topological analysis, the mapping of the 2D grid onto the 3D mesh minimizes distortion and guarantees continuity. The 2D grid, the element shapes and the density (multiresolution) can be changed straightforwardly, thus generating a modular approach.

The invention relates to a finite element modeling method for the welding line of a soldering board based on vehicle crash simulation, belonging to the vehicle computer-aided design technique field, comprising the following steps: first, baseplate modeling, which comprises baseplate hard spot arrangement, baseplate reseau partition, and baseplate reseau translation; second, building a double-beam welding line model, which comprises space nodes arrangement, a double-beam manufacturing, and connection of the beam and baseplate; third, the attribute assignment of the double-beam unit, which comprises the attribute assignment of beam unit material and the attribute assignment of the beam unit section; fourth, moving the built welding line model of the soldering board and the baseplate reseau model into an impact finite element computational model. The invention considers the material attributes of the welding line, as well as considers the shape of the welding line, can accurately simulate the deformational behavior of the welding line in crash simulation, enhances the simulation accuracy of vehicle crash, is rapid and effective, and is easy to master technicist.

A method of mesh generation processing for a bounded domain is provided. The bounded domain is divided into constituent sub-domains with a portion of the sub-domains being assigned to each of a plurality of processors. The processors are operated independently and in parallel. Each processor (i) discretizes the closed boundary for each of its sub-domains to generate coordinates that are identical for each portion of adjoining sub-domain boundaries and that satisfy specific conditions that optimize a selected mesh generation technique, and (ii) generates a mesh for each sub-domain assigned thereto using corresponding ones of the coordinates and the selected mesh generation technique.

The invention provides a watershed refined management system integrating a water environment model. The refined management system is provided with a database, the database stores hydrological data, meteorological data, pollution source data and water quality monitoring data, watershed river network meshing information stored in a river network meshing module divides a watershed into sub-computingunits, a sub-computing unit mesh of an entire watershed water system is finally determined, a model calculation module is used for simulating the pollutant concentration of each sub-computing unit mesh in the watershed to, and based on a water environment model, a water pollution accident analysis method, a pollution source response and treatment project benefit analysis method and a water qualitystandard exceeding influence backtracking pollution source method are constructed, thereby achieving the dynamic and refined management of pollution sources, projects, water quality and the like in the watershed.

The invention discloses an optimization design method for an air conditioner airduct structure, comprising the following steps of: (1) establishing at least two airduct models; (2) respectively carrying out grid partition on the spanned files of the airduct models, and importing generated grid files into CFD (Computational Fluid Dynamics) software; (3) setting model parameters and variable parameters in the CFD software; (4) working out noise and air quantity after the CFD software simulate air flow reaches the quasi-stable state; (5) comparing to obtain models with big air quantity and small noise in the airduct models, taking the models as the preselected scheme, then carrying out the airduct model modification on the preselected scheme for at least one time, and returning to the step (2) to determine a final airduct model; and (6) producing an air conditioner model machine by combining with the final airduct model, and conducting a noise experiment and an air quantity experiment. By using the optimization design method for the air conditioner airduct structure, the design cost of the air conditioner airduct structure can be reduced, the parameter test time is shortened and the use becomes convenient.

The invention discloses a method of adopting a grid to partition a region and analyzing a pollution index change trend reflected by surveillance video data in the grid for tracing the direct haze generation source in real time. The method comprises steps: firstly, grid partitioning is carried out in a region, and a no-haze reference map sample library based on a video image is built for each grid; then, through analyzing the surveillance video image and in combination with the no-haze reference map, based on time sequence analysis, fog and haze are distinguished, and the haze index, the grade, the change trend and the change speed in the surveillance image at the current position are determined; and finally, according to the position of the surveillance video, the haze index, the grade and the trend along with time changes, a haze diffusion path along with time changes is mapped, a grid sequence on the path is further obtained, and finally, a specific pollution source grid and a responsibility subject for the pollution source are determined. The method can be used for timely positioning the direct haze generation source in a specific region, and has the advantages of high recognition precision and high efficiency.

The invention relates to a method for predicating composite material Pi-shaped non-planar glue joint strength based on triangular envelopes. The method includes the following steps that (1), according to parameters of a composite material Pi-shaped non-planar glue joint structure, a geometrical model is established; (2), according to actual working conditions of the composite material structure, loads and boundary conditions of the Pi joint geometrical model are determined; (3), grid partition is performed on the joint geometrical model, and a Pi joint three-dimensional finite element model is obtained; (4), on the basis of the Pi joint three-dimensional finite element model, a finite element stress analysis is performed; (5), according to the linear finite element stress analysis result, a curved edge triangular envelope route of a Pi negative moment steel padding region is set on the basis of the Pi joint three-dimensional finite element model, all stress component values on the curved edge triangular envelope route are extracted, and the average value of the stress component values is calculated and substituted to the failure criterion for predicating the strength. The method for predicating the composite material Pi-shaped non-planar glue joint strength based on the triangular envelopes is suitable for engineering application and can obviously shorten a development cycle and reduce experimentation cost.

The invention belongs to fields of computer image processing; a method of generating three-dimensional finite element grid is disclosed that includes steps as following: 101. Two-dimension surface grid is divided on surface of the three-dimensional model of object noumenon; 102. The noumenon basic grid which encompasses the three-dimensional model is generated by the noumenon basic grid built by projection borderline; 103. The Two-dimension surface grid is inserted into the back of the noumenon basic grid, eliminating the noumenon grid which is out of the noumenon surface grid; the noumenon three-dimensional grid needed is obtained. Because said technical project is adopted, the Two-dimension surface grid and the noumenon basic grid are obtained easily, for adopting the penetration algorithm, the time of generating final noumenon grid is decreased than traditional approach, quantity of work in several months can be accomplished within several days even several hours. At the same time, because the three-dimensional noumenon grid generated is hexahedron grid, the quantity of grid id higher, the calculation error can be improved greatly.

The invention discloses a grid partitioning method which comprises the following steps: partitioning a point module and a linear module, and distributing points in the point module and the linear module; partitioning a horizontal two-dimensional plane into at least one independent region, and carrying out point distribution on the independent region according to a radial distributing rule; removing mutually-overlapped points; partitioning the points so as to obtain grids; after invalid grids are deleted, setting all the remaining grids as two-dimensional variable PEBI (perpendicular bisection) unstructured grids; and carrying out vertical expansion on each grid until the expanded grids are three-dimensional variable PEBI (perpendicular bisection) unstructured grids. By applying the schemedisclosed by the invention, when point distribution is carried out on the independent region, the point distribution is implemented according to the radial distributing rule, and the radial distributing rule is as follows: according to the value of distance between a distributed point and a well point in the independent region, the grid scale of the distributed point is increased, then the added value of the grid scale of a point adjacent to the distributed point is gradually increased, and the grid scales of the points (the distances between the points and the well point in the independent region are same) are same. Through using the point distribution mode, the number of the points in the independent region is reduced; and when grid partitioning is carried out on the points, the number of the grids is reduced, the calculation efficiency is improved, the calculation time is shortened, and the user burden is reduced.

The triangular mesh generating portion divides the surface of geometry model to be meshed in a meshed manner according to a target element dimension and generates a triangular mesh on the surface of geometry model. The regular mesh generating portion assumes a shaped parallelpiped enclosing the shape to be meshed. The parallelpiped is divided in a meshed manner by the hexahedral element whose distance between the nodes has the substantially same density as the triangular mesh on the surface. The resulting regular mesh located inside the triangular mesh on the surface of geometry model is divided into a tetrahedral meshed manner. The shell meshing area extracting portion extracts a shell-like space between the inner tetrahedral mesh and the triangular mesh on the surface of geometry model. The shell mesh generating portion generates the tetrahedral mesh in the overall shape to be meshed.

The invention relates to a personalized interbody fusion cage design method based on topological optimization and bony reconstitution simulation. The method includes the steps of conducting CT/MRI scanning on a vertebral body, segmenting a CT/MRI continuous cross-sectional image of the vertebral body, establishing a three-dimensional model, establishing a finite element model through the substeps of grid dividing and smoothing, material assignment, boundary condition setting, mechanical loading and the like, conducting the topological optimization design on an interbody fusion cage through a density-variable method, and evaluating whether the design is reasonable or not by conducting bony reconstitution numerical analogue simulation on the vertebral body and the cage bone filling area according to the adaptation bony reconstitution theory on the basis of the strain energy density.