38results about How to "Improve calculation efficiency" patented technology

The invention relates to a tuning calculation method of a distributed conjugated gradient method based on MPI. The calculation process of the conventional serial calculation method can not effectively utilize the advantages of a multi-kernel platform. When a new node is added to a calculation cluster, a pre-tuning algorithm is adopted to determine the calculation thread number of the node and obtain the optimal matrix block size suitable for cluster calculation; a matrix data structure is converted into a block compression structure according to the optimal block size; before calculation of the task to carry out, the calculation amount is allocated to the thread of each node according to the pre-tuning data of each node; and the calculation task is automatically allocated to the calculation node of the cluster by use of MPI when the calculation process of the conjugate gradient method executes the matrix-vector multiplication, and the calculation result is actively reduced to the main node. The method can lower the constant for calculating the time complexity and save the storage space by adopting a highly-compressed, flexible and convenient structure to segment a sparse matrix.

The present application discloses a method for calculating the height of a ship, which includes: acquiring a three-dimensional point cloud of a ship on the water surface; projecting the three-dimensional point cloud onto a target plane to obtain a corresponding two-dimensional point cloud, the target plane being parallel to the vertical Direction; in the target plane, process the two-dimensional point cloud, and fit the straight line representing the intersection position of the ship and the water surface, that is, the hull-water surface intersection line; in the target plane, calculate the two-dimensional point cloud and the fitted hull ‑The furthest distance from the intersection of the water surface as the height of the ship. The application also discloses a ship height measuring and calculating system. According to the embodiment of the present invention, the height detection of the ship can be performed more flexibly, and at the same time, it is beneficial to reduce the calculation amount of height measurement and improve the efficiency of measurement and calculation.

The investment measurement method based on the big data mining technology provided by the present invention obtains the business data in each business system of the enterprise to obtain the first data source; and analyzes the offline business documents through the self-developed parsing program to obtain the second data source. data source; cleaning and sorting data of the first data source and the second data source according to a preset data cleaning model to obtain cleaning data; integrating the cleaning data to obtain a data warehouse; building an analysis application platform; receiving The user's operation creates a new measurement task; the measurement task is analyzed to obtain the measurement result. The use of application analysis can greatly improve the efficiency of investment calculation. By replacing manual analysis with application analysis, the work time can be shortened to 1 / 30 of the original, which improves the calculation efficiency and shortens the calculation time. Using real historical business data, the quality of analysis results can be guaranteed, and the investment measurement method is an important investment decision-making tool for real estate projects.

The present application provides a method and an apparatus for measuring a water utilization coefficient of an end canal system. The method comprises: obtaining an image of a test irrigation area; positioning an end canal with the water utilization coefficient of the end canal system to be measured, in the image; determining a non-field channel of the end canal according to the image; determiningthe water inlet on the end canal as an inlet measurement point, and the water outlet on the non-field channel as an outlet measurement point; after setting measurement instruments on the inlet measurement point and the outlet measurement point respectively, obtaining the flow rate of each measurement point according to the measurement data of each measurement instrument; and determining the waterutilization coefficient of the end canal system according to the flow rate of each measurement point. According to the technical scheme of embodiments of the present application, the measurement points in the test irrigation area can be determined by using an image processing technology, and the water utilization coefficient of the end canal system can be further determined, so that the problems of long time consumption and low efficiency caused by manually determining the measurement points in the prior art are solved, and efficiency for measuring the water utilization coefficient of the endcanal system is improved.

The invention discloses a knife with a hair counting function, which comprises a casing with a handle in the casing inner cavity. A fixed plate, a storage battery, a place board, and a counting deviceare respectively arranged at the top of the handle. Both sides of the handle are provided with a limiting block. A connecting block, a knife rod and a knife head are respectively arranged at the bottom of the knife handle. Both sides of the knife rod bottom are provided with a limiting plate. A pressure sensor, a spring, a connecting rod and a vibration sensor are arranged at the bottom of the casing in order. A fixed mechanism is fixed at the top of the casing, comprising a first fixed block and a second fixed block. A digital display is arranged on the fixed mechanism. The casing is fixedlyconnected with a protective cover. The knife with hair counting function can calculate the number of planting hair, thereby avoiding the error of manually measuring, improving the measuring efficiency, and reducing the probability of the knife cutting too deep. The knife with hair counting function prevents the head from touching the ground and being contaminated by germs. The knife can also beheld firmly and used conveniently.

The invention belongs to the technical field of electrical power system parameter identification, and relates to a measurement method of electric power line parameter accuracy influenced by data errors. According to the method, influence of parameters of an equivalent circuit of a power transmission line on PMU (phase measurement unit) data sensitivity is determined, sensitivity of line parameters to PMU data errors is judged, a parameter accuracy calculation method is given, the quantitative influence degree of each data to power line parameters is judged according to the quantitative relation between data error increment and parameter deviation, and the measured PMU data quality and the parameter identification accuracy are improved. The design principle is reliable, scientificity of the judgment technology is high, the accuracy is high, quantification is accurate, the application range is wide, and the measurement efficiency is high.

The invention discloses a method for positioning rotor rubbing sound emission source by applying time delay estimation, which comprises the following steps of: (10) building a one-dimensional linear positioning model; (20) setting a primary iteration value of attenuation coefficient estimation and a primary iteration value of time delay estimation; (30) calculating an estimation error between a real value and an estimation value; (40) calculating a next iterative step size according to the estimation error; (50) calculating iterated time delay estimation and attenuation coefficient estimation; (60) calculating a new estimation error; and (70) comparing relative error of the two estimation errors calculated in the step (30) and the step (60), measuring the position of the rubbing source according to delay time estimation if the relative error is smaller than a set value, or forwarding to the step (40) to continue iteration. According to the method, the problem of signal attenuation and strong noise interference during transmission of a rubbing sound emission signal of a rotor system is considered, and the rubbing fault source is accurately positioned by adding steps of attenuation estimation and changing the step size.

The invention provides a method for calculating the three-dimensional porosity of soil, which belongs to the field of indoor soil porosity testing, including preparing soil samples; obtaining images of soil sample sections by scanning electron microscopy; The binarization threshold in the threshold sequence performs binarization processing on the image respectively, and obtains the gray area in the image after binarization processing; fits the gray level according to the binarization threshold and the gray area corresponding to the binarization threshold The curve of the area changing with the binarization threshold; integrate the curve equation of the gray area changing with the binarization threshold to obtain the pore volume of the soil surface microstructure in the image; obtain the overall volume of the soil surface particles and pores in the image; Calculate the porosity. The error of the method for calculating the three-dimensional porosity of the soil provided by the invention can be limited within a reasonable error range, the accuracy of the measurement result is high, and the measurement process is simple, which is conducive to improving the measurement efficiency.