43results about How to "Flexible modeling" patented technology

The invention provides a simulation evaluation method for access of a distributed power source to a power distribution network. The simulation evaluation method comprises the steps that a power distribution network topology model is established; a current result of the power distribution network is calculated; simulation evaluation of access of the distributed power source to the power distribution network is conducted. According to the simulation evaluation method for the access of the distributed power source to the power distribution network, through establishment of the power distribution network topology model containing the distributed power source, current information of a whole system is calculated; through a constructed evaluation index system for access of the distributed power source to the power distribution network, an index weight evaluation method is adopted to score the influence of access of the distributed power source on the power distribution network, and a result can provided guide suggestions for access of the distributed power source.

The invention discloses a deformable context coding network model and a liver and liver tumor segmentation method, which can accurately determine the contour positions of a liver and a liver tumor, realize more accurate liver and liver tumor segmentation, have a wide application prospect, and are suitable for popularization and application. According to the network model of the invention, deformable convolution is utilized to enhance the feature representation capability of a traditional encoder, help the traditional encoder to learn a convolution kernel with adaptive spatial structure information, and eliminate interference of different sizes of liver tumor positions; according to the method, the global feature information in the image is coded by using the Ladder spatial pyramid poolingmodule for extracting the multi-scale context information, so that the contour positions of the liver and the liver tumor are determined more accurately, more accurate liver and liver tumor segmentation is realized, and the method has a wide application prospect.

The invention discloses a microwave passive circuit electromagnetic heat integral analysis method based on a spectrum element method. According to the method, firstly, a time domain spectrum element method is adopted for solving maxwell's equations, the instantaneous electric field and magnetic field distribution of a circuit under the effect of high-power pulses is worked out, and the electromagnetic loss at the current moment is obtained. If all of the electromagnetic loss inside a mold is converted into heat energy, the obtained heat energy is substituted into a heat conduction equation, and the temperature distribution conditions of each point at the current moment are obtained. Electricity characteristic parameters of materials at a next moment are obtained by utilizing a relational expression of dielectric parameters along with the temperature change, an electromagnetic field equation is calculated again, and the electromagnetic loss is obtained. The operation is repeatedly cycled in such a way until the preset heating time is completed. Through the electromagnetic heat integral analysis, the distribution condition of the temperature inside the mold along the time change when a filter receives the effect of different pulses can be clearly obtained, the modeling is flexible, the subdivision is convenient, formed matrixes have good sparsity, and the solving efficiency is higher.

A method and a computer system (10) are disclosed for scattered beam correction in a CT examination of an object in a multi source CT. In at least one embodiment, the method includes generating original projection data records; reconstruction of the object (P) with the original projection data records of at least one detector (3,5); determining the scattered radiation generated by each emitter (2,4) exclusively in the direction of the original beams of the at least one other emitter relative to its opposing detector (3,5); generating corrected projection data records by removing the calculated scattered radiation from the original projection data records; reconstruction of the object (P) with the corrected projection data records, and implementing a further iteration of the method when determining the scattered radiation or issuing the reconstruction result if at least one predetermined abort criterion applies.

The invention discloses a multi-grid precondition method for fast acquiring complex target radar echoes. The method includes: modeling a target, and using coarse triangular grids to subdivide the surface of the target; subdividing the coarse grids to obtain nested grids, and building RWG basis functions on grid layers; using RWG basis function expansion relations of adjacent grid layers to build a first set of interpolation, limiting operator and coarse grid matrixes, building rotation basis functions at the edges of the grid layers, and using RWG basis function expansion relations of adjacent grid layers to build a second set of interpolation, limiting operator and coarse grid matrixes; and using the multi-grid precondition method to solve equation sets, and using the first set of interpolation, limiting operator and coarse grid matrixes and the second set of interpolation, limiting operator and coarse grid matrixes to accelerate convergence of matrix equation iteration solution. Due to the fact the basis functions are constructed at the edges of the grids, the basis functions are high in modeling precision, two sets of operators are used to accelerate convergence of matrix equation iteration solution, and matrix equation solution can be accelerated evidently.

The invention relates to a method (10) for filling level detection in a cylinder of a combustion engine, said cylinder being connected to an intake runner via an inlet valve, and to an exhaust channel via an exhaust valve. The method (10) comprises the following steps: providing (102) a database having a data set relating to an amount of a filling component in accordance with an exhaust gas back pressure (pag) in the outlet channel, said step (102) of providing a database involving the provision (100) of measurement data (30) measured on a test bed, and the provision (101) of simulation data (31) calculated using a charge exchange calculation; determining (103) a basic function (20) that qualitatively describes the dependency of the filling component amount on the exhaust gas back pressure (pag); and adapting (104) the basic function (20) to at least the one data set of the database by appropriately selecting variable parameters of the basic function (20).

The invention discloses a simulation method for a twelve-phase brushless direct current motor. The method comprises the following steps: setting initial parameters of the motor and setting reference rotation speed of the motor; calculating phase current, electromagnetic torque and motor speed of each phase stator winding according to the initial parameters of the motor; acquiring the rotor position of the motor, and calculating the reference current of each phase stator winding according to motor rotating speed, reference rotating speed and rotor position of the motor; obtaining a PWM controlsignal according to the reference current of each phase stator winding and the phase current of each phase stator winding; controlling the ground voltage of each phase stator winding according to thePWM control signal, and recalculating the phase current, electromagnetic torque and motor speed of each phase stator winding; obtaining the phase current waveform, electromagnetic torque waveform andmotor speed waveform of each phase stator winding. The twelve-phase brushless direct current motor is simulated on a simulation platform by simulation software, and waveform simulation and adjustmentof the motor parameters can be better conducted until the required waveforms are obtained, so that the motor parameters meet the motor performance.

The invention discloses an integrated analysis method of MOSFET electrothermal under the action of high-power electromagnetic pulse. This method first uses the time-domain spectral element method to solve the drift-diffusion equations, and obtains the instantaneous carrier concentration and potential distribution of the MOSFET under the action of high-power pulses, and obtains the electric field strength and current density at the current moment. Assuming that the heat source inside the model is only Joule heat source, considering the influence of ambient temperature and thermal convection, the temperature distribution of each point at the current moment is obtained. Electric field parameters such as carrier mobility are updated according to temperature changes. This cycle is repeated until the drift-diffusion equations meet the convergence accuracy, and the electric field distribution and heat distribution at this time are the required electric heat distribution inside the MOSFET at the current moment. This analysis method has extremely important practical significance for researching semiconductor devices such as MOSFET against high power destruction.

The invention provides a three-dimensional virtual maintenance simulation model construction method based on an operation unit. The creation of a maintenance flow simulation model, the construction ofan operation unit model and the construction of a maintenance task simulation model are completed in sequence. According to the invention, the maintenance task operation is decomposed into the minimization of the non-redivisible disassembly and assembly units, namely the operation units, only the motion information of the basic maintenance operation is contained, the operation units are managed in a discrete manner, and the operation units have no association relationship and exist independently. The operation units are made to correspond to the digital prototype model and the maintenance task flow nodes by defining the incidence relation, the operation units can be combined according to the maintenance task flow, when the same node exists in the maintenance task flow, the operation unitscan be directly reused, and maintenance simulation models with different layer granularities are generated. Thus, low-coupling and high-aggregation data association is used for achieving flexible andrapid construction of the three-dimensional virtual maintenance simulation, the workload is reduced, and the three-dimensional virtual maintenance simulation construction efficiency is greatly improved.

The invention discloses an electric field analysis method of an electromagnetic pulse nano semiconductor device. The steps of the method are as follows: in the first step, the solution model of MOSFETis established, and the model is divided by using the curved hexahedrons to obtain the structural information of the model, including the element information and node information of the hexahedron; in the second step, starting from the carrier current continuity equation, Poisson equation and carrier quantum correction equation, the backward Euler time difference is used firstly, then the discontinuous Galerkin method is used to test the equation, and the electric field boundary condition is imposed to obtain the electric field and current distribution of each node. On the premise of the samecalculation amount, Under the action of electromagnetic pulse and voltage, the distribution of the internal electric field with time can be obtained more clearly, which can reduce the computational load when the convergence accuracy is the same. In addition, the method has the advantages of flexible modeling and convenient dissection, and the formed matrix has good sparsity and high efficiency ofsolution.

The invention discloses an efficient field-circuit co-simulation method based on a space mapping technology, and provides analysis on an energy selective surface based on a space mapping algorithm, the method mainly introduces a rough model and a fine model, the rough model with high calculation efficiency is used for solving in the solving process, and the calculation efficiency of the fine model is improved. And verifying by using a fine model with low calculation efficiency after solving is completed. According to the method, the rough model is an equivalent circuit model, the fine model is a real physical model, and the result shows that the method not only can keep high accuracy, but also has a remarkable acceleration effect.

The present invention provides a method for encoding a video signal based on an Edge Adaptive Graph-Based Transform (EA-GBT) including detecting a step edge or a ramp edge from a residual signal; generating a graph signal based on at least one of the step edge or the ramp edge; obtaining an EA-GBT coefficient by performing the EA-GBT for the graph signal; quantizing the EA-GBT coefficient; and entropy-encoding the quantized EA-GBT coefficient.