9 results about "Three dimensional simulation" patented technology

The application relates to the technical field of surgical intelligent assistance, and relates to an auxiliary analysis system for ureteroscopy and a storage medium. A computer readable storage medium stores a computer program, the computer program comprises program instructions, and the program instructions enable a processor to execute the following steps when the program instructions are executed by the processor: using a medical detection device to perform preoperative examination on a patient for ureteroscopy to obtain preoperative detection information; obtaining a multi-feature fusion image according to the preoperative detection information; introducing a light emission mechanism and a model rendering method to combine the preoperative detection information and the fusion image to construct a three-dimensional model and obtain a three-dimensional simulation model of the patient; and formulating a ureteroscopy scheme based on the preoperative detection information, the multi-feature fusion image and the three-dimensional simulation model to realize surgical auxiliary analysis and guarantee surgical safety. The application forms a closed loop of preoperative examination, information analysis, model construction and scheme formulation, realizes intelligent surgical assistance, and improves surgical safety and success rate.

This invention relates to the field of lidar ranging technology, and more particularly to a feature extraction system and method for lidar point clouds. The system extracts feature information from the current three-dimensional point cloud voxel tensor and the pulse signal from the previous moment to obtain the current three-dimensional simulated input current. Based on the current three-dimensional simulated input current of the neuron and the previous simulated membrane potential value, an adaptive threshold is used to control the neuron's output of the current discrete pulse signal. Based on the discrete pulse signal, the simulated membrane potential values ​​of adjacent moments are sparsely aggregated to obtain the output features that fuse the spatiotemporal dynamics and local topological depth attributes of the point cloud data stream. This invention uses an adaptive threshold to preserve the local three-dimensional topological and temporal dynamic information in the three-dimensional point cloud obtained by lidar ranging; and uses a total loss function including temporal balance loss and membrane potential utilization loss to dynamically balance the neuronal activity in the spiking neural network, avoiding abnormal decay or hill effect.

The embodiments described herein provide a probability distribution for determining the matching of 3D points in a template feature map with 3D points in space. A dual-domain target structure tracking end-to-end system receives one-dimensional or two-dimensional projection data and a 3D simulated image. The end-to-end system extracts a template feature map from the simulated image using segmentation. The end-to-end system extracts (206) features from the projection data, transforms the features of the projection data into a 3D space, and sorts the 3D space to generate a 3D feature map. The end-to-end system compares the template feature map with the generated 3D feature map (210) to determine (212) the instantaneous probability distribution of the template feature map appearing in the 3D feature map.

The application discloses a construction collision prediction and analysis method in a three-dimensional scene and belongs to the technical field of underground construction detection. The method comprises the following steps: acquiring three-dimensional simulation scene data, correcting the error caused by ground subsidence by taking a building with unchanged height as a reference, determining the specific depth of an underground component and constructing a collision body; constructing an envelope body based on the longest side length of a non-visible three-dimensional model component; for a pipeline beyond a construction area, cutting the envelope body by using a spherical section of a true construction range to reduce the analysis range; dynamically cutting the collision body into a plurality of collision elements in a specified distance unit, performing pre-collision and point-by-point collision calculation on the envelope body after screening, and obtaining a point set of intersection; and finally responding to a terminal instruction to dynamically display a construction risk position in three dimensions. The application combines ground error correction, pipeline accurate cutting and dynamic cutting, eliminates a large amount of redundant data, and significantly improves the accuracy and analysis efficiency of construction collision prediction in a complex underground environment.

The application relates to the technical field of laser radar ranging, in particular to a laser radar point cloud feature extraction system and method, feature information is extracted from a three-dimensional point cloud voxel tensor at a current moment and a pulse signal at a previous moment respectively, and a three-dimensional simulation input current at the current moment is obtained; according to the three-dimensional simulation input current at the current moment and a membrane potential simulation value at the previous moment of a neuron, a discrete pulse signal at the current moment is output by using an adaptive threshold value to control the neuron; according to the discrete pulse signal, sparse aggregation is carried out on the membrane potential simulation values at adjacent two moments, and output features of fused point cloud data stream space-time dynamics and local topological depth attributes are obtained. The application retains local three-dimensional topologies and time dynamic information in three-dimensional point clouds obtained by laser radar ranging by using an adaptive threshold value; a total loss function including a time balance loss and a membrane potential utilization loss is used to dynamically balance neuron activities in a pulse neural network, and abnormal attenuation or hill effect is avoided.

An apparatus may provide a controller, and a memory configured to store at least one instruction. The at least one instruction when executed by the controller, may cause the apparatus to receive, from a user device, a request for storage information, the request including at least one of storage company information, branch information, or space information for each branch; transmit, to the user device and based on the request, the storage information, receive, from the user device, an experience request for at least a storage of a plurality of storages associated with the storage information, and transmit, to the user device and based on the experience request, experience information for the storage, wherein the experience information may include a three dimensional simulation result associated with the storage.

This invention belongs to the field of tunnel engineering technology and provides a three-dimensional simulation system and method for multi-level linkage alarm of tunnel water inrush and mud inrush disasters. The simulation system includes a multi-field information acquisition system that collects information on water level height, water pressure, flow rate, and time-series images of the tunnel face to obtain relevant information on the entire evolution process of water inrush and mud inrush geological disasters; a water inrush hazard assessment processor is used to synchronously align and extract features from the relevant information on the entire evolution process of water inrush and mud inrush geological disasters, and then uses a weighted fusion method to obtain a comprehensive water inrush risk index; the water level height, water pressure, and flow rate information in the tunnel are compared with corresponding thresholds to initially determine the water inrush hazard level, and then the water inrush hazard level is adaptively adjusted according to the comprehensive water inrush hazard index; a multi-level linkage alarm system is used to match linkage alarms according to the adjusted water inrush hazard level to meet the simulation requirements of water inrush and mud inrush geological disasters under complex working conditions.

The application relates to the technical field of building construction, in particular to a round pipe column foot pre-burying positioning method and device. The method comprises the following steps: obtaining a steel structure construction drawing; constructing a round pipe column and pre-burying foot bolt construction model according to the steel structure construction drawing; establishing the positioning connection of the pre-burying foot bolt and vertical main reinforcement according to the construction model; carrying out construction model collision analysis and three-dimensional simulation experiment based on the positioning connection of the pre-burying foot bolt and the concrete main reinforcement; and carrying out steel structure device processing and installation based on the construction model. The engineering quality is improved by optimizing the construction node, the problem that the pre-burying steel plate cannot be reused is solved, the vertical column reinforcement and the foot bolt pre-burying steel plate grinding tool can be freely stretched and contracted to control the position of the reinforcement, the effect of reusing different column diameters is achieved, the construction efficiency is improved, the progress is accelerated, and good economic and social benefits are achieved.

The application discloses a finite element calculation method of a long-blade axial locking structure and relates to a finite element calculation method. The application is used to solve the problem that the result is distorted due to the direct finite element calculation of the model without the locking structure in the prior art. The application can perform safety checking of the model including the locking structure, perform three-dimensional simulation and analysis calculation by using finite element calculation software, check the safety of the locking structure by using the finite element calculation method, especially can check the stress level of the locking structure under low-cycle fatigue, solve the problem of calculation convergence in the calculation process by reasonably setting the boundary conditions, solve the blank of the calculation scheme of this type, and make the finite element simulation calculation of the long blade closer to the real working state of the simulation blade. The application belongs to the technical field of finite element calculation of steam turbine blades.