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70results about How to "Improve characterization accuracy" patented technology

Data processing method and device based on user scenario

InactiveCN104657506ARich clustering featuresImprove the extension dimensionSpecial data processing applicationsMarketingGeolocationReal-time computing
The invention provides a data processing method and a data processing device based on a user scenario. The method can comprise the following steps: acquiring track data of a user in a preset time period, wherein the track data comprises more than one triple (user, time and position), and each element in the triple has one or more than one attributive character; clustering the track data according to the one or more than one attributive character of each element in the triple, and determining the information of a scenario at which the user is positioned at present according to the attributive characters with significance in the clustering result; and transmitting the message associated with the information of the scenario at which the user is positioned at present to the user. According to the method and the device, compared with scenario description based on geographical location only, the description precision of the user scenario is improved, and different scenarios positioned at the same geographical location can be distinguished.
Owner:BAIDU ONLINE NETWORK TECH (BEIJIBG) CO LTD

Ultrasonic RF (radio frequency) time sequence-based tissue characterization method

The invention discloses an ultrasonic RF (radio frequency) time sequence-based tissue characterization method, which comprises the following steps of 1, feature extraction: performing operations as shown as follows on each tissue sample to obtain corresponding feature vectors; 2, tissue recognition, wherein the step1 comprises the following steps: 1-1, scanning tissues to acquire multiple frames of ultrasonic echo RF signals of the tissues; 1-2, demodulating a certain ultrasonic echo RF signal and displaying a B-mode graph; 1-3, selecting an ROI (region of interest) of which the size is M*N from the B-mode graph; 1-4, taking previous L RF signals from each point in the ROI to construct M*N ultrasonic RF time sequences of which the length is L; 1-5, extracting fractal features, frequency domain features and time domain features of the ultrasonic RF time sequences to obtain the feature vectors of each tissue samples. According to the ultrasonic RF time sequence-based tissue characterization method disclosed by the invention, the features from three angles: fractal, frequency domain and time domain, are extracted based on the ultrasonic RF time sequences, and the tissues are recognized by using a classifier; the ultrasonic RF time sequence-based tissue characterization method can be widely applied to the field of ultrasonic medical detection and ultrasonic tissue characterization, and the like.
Owner:SOUTH CHINA UNIV OF TECH

Mutant pores

ActiveUS20190300582A1Enhanced ability to estimate characteristic of analytesEasily discriminatedMicrobiological testing/measurementDepsipeptidesAnalytical chemistryAnalyte
The invention relates to mutant forms of CsgG. The invention also relates to analyte detection and characterisation using CsgG.
Owner:OXFORD NANOPORE TECH LTD

Multi-wave seismic oil and gas reservoir prediction method based on deep neural network

The invention discloses a multi-wave seismic oil and gas reservoir prediction method based on a deep neural network. The method comprises the steps of firstly, carrying out optimization on seismic attributes through employing a particle swarm optimization clustering analysis method and a kernel principal component analysis method for original data obtained from a longitudinal and transverse wave seismic attribute set, removing redundant information, and highlighting characteristics of the multi-wave seismic oil and gas reservoir to obtain better deep neural network sample data; then, learningthe obtained sample data through a deep neural network model, and carrying out simulation prediction to obtain an oil and gas reservoir evaluation map; and finally, performing image enhancement processing on the oil and gas reservoir evaluation image so as to improve the detail information and the edge identification degree of the image and improve the definition of the image. In oil and gas reservoir prediction, the method provided by the invention can improve the depicting precision of the seismic oil and gas reservoir, and provides a new way for identification and prediction of the oil andgas reservoir.
Owner:SHANDONG UNIV OF SCI & TECH

Hepatic fibrosis degree Fisher identification method based on ultrasonic radio frequency (RF) time sequence

The invention belongs to the technical field of ultrasonic medicine and particularly relates to a hepatic fibrosis degree Fisher identification method based on an ultrasonic radio frequency (RF) time sequence. The method includes that first, a broadband ultrasonic linear array probe is used for scanning a living hepatic tissue, and multi-frame ultrasonic echo RF signals are recorded; a certain frame of B type pattern is demodulated and displayed, a region of interest (ROI) is selected, all frame RF signals of each point in the ROI are taken to form the ultrasonic RF time sequence; SMR fractal dimension mean values and a plurality of characteristic parameters of the RF time sequence in the ROI are extracted, the 7 features are extracted for a large amount of normal and fibrosis hepatic samples, Fisher distinguishing rate of each feature parameter is collected and obtained, the normalization Fisher distinguishing rate is used as the weight of a new input sample corresponding feature parameter, and the absolute value of each feature parameter of a new sample is weighted and summed to obtain Score-fisher. The hepatic fibrosis degree Fisher identification method based on the ultrasonic RF time sequence is brought up for the first time and provides quantification reference for clinical hepatic fibrosis diagnosis and dynamic monitoring.
Owner:SOUTH CHINA UNIV OF TECH

Method for synchronously characterizing anisotropic yield and hardening constitutive parameters of metal material

The invention discloses a method for synchronously characterizing anisotropic yield and hardening constitutive parameters of a metal material, which is used for solving the technical problem of poor practicability of the conventional method for characterizing the parameters of the metal material. The technical scheme is that a proper test piece configuration is designed, so that the test piece can simultaneously generate rich positive strain and shear strain under the action of simple tensile or compressive load, and the out-of-plane deformation of the test piece is at a lower level within a certain compressive strain range, thereby achieving the simultaneous characterization of anisotropic yield and anisotropic plastic hardening constitutive parameters of numerous metal materials by utilizing a virtual field method only by combining primary cyclic tensile-compression experiment and primary unidirectional tensile experiment. Compared with the anisotropic parameter characterization method in the prior art, the method can be completed on one single-axis testing machine without a biaxial stretching machine, a hydraulic expansion testing machine, a shearing experimental device and the like, and experimental equipment and an experimental process are simplified, and the practicability is good.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Method for performing clutch transmission efficiency test on vehicle

The invention relates to a method for performing a clutch transmission efficiency test on a vehicle. The method for performing the clutch transmission efficiency test on the vehicle comprises the steps that a test system hardware is connected; vehicle warm-up is carried out; when the tested vehicle is fully loaded, a tester puts a transmission into a first or second gear, an actual vehicle road initial starting test is carried out according to the habit of the tester, an accelerator pedal is not stepped in the test process, and when the vehicle speed is not lower than the lowest stable vehiclespeed of the gear, the test is stopped; and the vehicle clutch transmission efficiency is determined by the road taxiing resistance, the acceleration resistance, the wheel edge received power, the engine output power and the vehicle clutch efficiency. According to the technical scheme, the vehicle clutch transmission efficiency test is carried out on an actual road, and the advantages of convenient operation, high repeatability and reliable test are achieved.
Owner:ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD

Feature extraction method for ultrasound tissue characterization based on Hilbert-Huang transform

The invention discloses a feature extraction method for ultrasound tissue characterization based on the Hilbert-Huang transform. The method comprises the steps of acquiring multiple frames of ultrasonic echo RF signals of a tissue sample, selecting regions of interest, and constructing an ultrasonic RF time sequence; extracting features of the ultrasound RF time sequence by using a HHT algorithm to obtain sample feature vectors based on the relation of time, frequency and energy; and performing feature screening and feature fusion by using a rankfeatures algorithm, calculating a sample feature fusion index, and taking the feature fusion index as the feature for tissue characterization. The feature fusion index provided by the invention can effectively reflect the difference between different types of tissue samples and is suitable for the feature extraction of the ultrasonic tissue characterization.
Owner:SOUTH CHINA UNIV OF TECH

Hepatic fibrosis degree relative deviation identification method based on ultrasonic radio frequency (RF) time sequence

The invention belongs to the technical field of ultrasonic medicine and particularly relates to a hepatic fibrosis degree relative deviation identification method based on an ultrasonic radio frequency (RF) time sequence. The method includes that first a broadband ultrasonic linear array probe is used for scanning a living hepatic tissue, and multi-frame ultrasonic echo RF signals are recorded; a certain frame of B type pattern is demodulated and displayed, a region of interest (ROI) is selected, all frame RF signals of each point in the ROI are taken to form the ultrasonic RF time sequence; SMR fractal dimension mean values and a plurality of characteristic parameters of the RF time sequence in the ROI are extracted, the 7 features are extracted for a large amount of normal and fibrosis hepatic samples, relative deviation value of each feature parameter is collected and obtained, the normalization relative deviation value is used as the weight of a new input sample corresponding feature parameter, and the absolute value of each feature parameter of a new sample is weighted and summed to obtain Score-rd. The hepatic fibrosis degree quantification identification method based on the RF time sequence is brought up for the first time and provides quantification reference for clinical hepatic fibrosis diagnosis and dynamic monitoring.
Owner:SOUTH CHINA UNIV OF TECH

Seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision

The invention provides a seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision. The method includes: firstly, utilizing an input seismic data set forinversion of corresponding seismic wavelets, reflection coefficients and average seismic wavelets, then constructing seismic wavelets rich in low-frequency information, and finally convolving the seismic wavelets rich in low-frequency information and the reflection coefficients to obtain low-frequency energy enhanced seismic data rich in low-frequency information. Transverse and longitudinal changes of the seismic data in a work area are considered, processing parameters can be rapidly determined according to the actual situation of the work area, an optimal processing effect can be obtained,and the depiction quality of fault and fracture systems and other geological anomalies in the deep carbonate reservoir can be remarkably improved.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Quantitative prediction method for slope break belt by utilizing seismic data

The invention relates to a quantitative prediction method for a slope break belt by utilizing seismic data. The method comprises A according to the background data, such as geology and earthquake, performing fine three dimensional seismic horizon explanation for the series of strata of the developed slope break belt, and obtaining the horizon data of the target horizon; B solving the gradient and the exposure value of the target horizon; C according to the gradient and the distribution characteristic on an exposure planar graph, preliminarily identifying the distribution range of the slope break belt; if the boundary of the slope break belt is clear, directly solving the geometrical parameters of the slope break belt: rupture, slope toe, gradient, altitude difference and horizontal width; if the boundary of the slope break belt is fuzzy (such as influence of breakage), performing the step D; D counting and solving the mean value theta for all the exposure values in the preliminarily identified slope break belt range; E taking the theta as the center and Delta as the step length, scanning and solving the optimal apparent gradient Phi in the theta+-Epsilon range; and F according to the solved optimal apparent gradient in the step E, identifying the boundary of the slope break belt, and respectively solving the geometrical parameters of the slope break belt. The quantitative prediction method for a slope break belt by utilizing seismic data can realize plane depiction of the gradient of the slope break belt, and can improve the accuracy for gradient calculation.
Owner:SOUTHWEST PETROLEUM UNIV

Method for automatically recognizing hob failure form of numerical control gear hobbing machine

The invention discloses a method for automatically recognizing the hob failure form of a numerical control gear hobbing machine. The method includes the following steps of firstly, collecting main shaft vibration signals through an embedded vibration acceleration sensor in real time; secondly, obtaining main shaft vibration signals of various hob failure forms corresponding to different hob technological parameters, establishing vibration path graph signals, extracting features to form standard feature vectors, and then establishing a standard feature vector subset and a standard feature vector set; thirdly, calculating the similarities of sample feature vectors and the standard feature vectors, obtaining the average similarity, and accordingly judging the hob failure form. By means of themethod, by establishing the vibration path graph signals, combining the processing of the main shaft vibration signals of the numerical control gear hobbing machine with the spectrum theory and conducting the feature extracting and failure form recognizing of the hobbing failure form, the on-line real-time monitoring of the hob failure form can be realized, the dependency on professional skills of operators is reduced, and labor cost is reduced.
Owner:CHONGQING UNIV

High-precision inversion method for deep-water turbidite sandstone reservoir under complex fracture system

The invention relates to a high-precision inversion method for a deep-water turbidite sandstone reservoir under a complex fracture system. The high-precision inversion method comprises the following steps that 1, a three-dimensional fault framework model is established according to fault interpreting data; 2, a three-dimensional horizon framework model is established according to seismic horizon interpreting data; 3, the development sequence of a fault and a horizon is judged according to tectonic evolution characteristics and geological prior information, the space truncation relation of thefault and the horizon is defined on the basis, and the three-dimensional fault framework model obtained in the step 1 and the three-dimensional horizon framework model obtained in the step 2 are combined to obtain a high-precision three-dimensional seismic formation framework; 4, a 'multi-body phase controlled iteration method' is adopted to establish an inversive low-frequency model; 5, iterativeoptimization is conducted on the prestack inversion process until an inversion result meets the requirement that space errors and loss functions are minimum, and a final inversion result is output.
Owner:CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1

Panoramic look-around view generation method, in-vehicle device and in-vehicle system

The current disclosure relates to a panoramic look-around view generation method, an in-vehicle device and an in-vehicle system. The method comprises the following steps of: acquiring images of areas around a vehicle, steering wheel angle information and vehicle speed information; transforming and mosaicking the images to generate a time-related look-around view, and using an ORB algorithm to extract characteristic points; using steering wheel angle information and vehicle speed information to calculate a positron of a characteristic point of the look-around view at previous time in the look-around view at current time according to a vehicle motion model, and selecting a characteristic point located near the position in the look-around view at current time to be matched with the characteristic point of the look-around view at previous time; calculating an affine transformation matrix and performing affine transformation, and performing weighted fusion with the look-around view at current time and storing it; repeating the above steps to obtain a continuously updated panoramic look-around view, The method, the device and the system can eliminate blind area in the underbody region, realize a panoramic perspective view, and have fast calculation and high accuracy.
Owner:BLACK SESAME TECH INC

Geological modeling method for internal seepage barriers in offshore oilfield reservoir

ActiveCN110687603AEffectively describe the real distributionImprove characterization accuracySeismic signal processingHorizontal wellsOil field
The invention relates to a geological modeling method for internal seepage barriers in an offshore oilfield reservoir. The method comprises the following steps: collecting sensitive seismic attributesof a to-be-measured reservoir, predicting distribution of internal seepage barriers in the reservoir, and classifying the seepage barriers into three classes of impermeability, semi-permeability andpermeability; according to horizontal well data of seepage barrier drilling in the to-be-measured reservoir, carrying out statistics of basic data for representing three types of seepage barriers; establishing lithofacies models of impermeable, semi-permeable and permeable seepage barriers seepage barriers respectively; and according to the attribute characteristics of the seepage barriers, setting virtual wells in the lithofacies models and simulating attribute characteristics of the three types of seepage barriers to obtain a geological model of the seepage barriers in the reservoir. According to the invention, real distribution of the seepage barriers in the reservoir is effectively described and defects of the traditional utilization theory are overcome. Since the virtual wells are setby y copying the actually-drilled horizontal well, the basic data of geological modeling are enriched and the characterization precision of the seepage barriers in the geological model is improved.
Owner:CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1

Three-dimensional angularity detection system and detection method

The invention provides a three-dimensional angularity detection system and detection method. A Z-axis electric focusing device drives a microscope lens module to move up and down in a direction perpendicular to the upper surface of an X / Y-axis electric stage device; the X / Y-axis electric stage device moves in a direction parallel to the upper surface of the X / Y-axis electric stage device; a powersource is mounted on one side, facing the upper surface of the X / Y-axis electric stage device, of the microscope lens module; the microscope lens module is connected with a three-dimensional image mosaic module through a transmission line, and images, shot at different heights by the microscope lens module, of to-be-detected particles on a stage are sent to the three-dimensional mosaic module andsubjected to mosaic processing to form three-dimensional data points; the three-dimensional image mosaic module sends the three-dimensional data points to an angularity detection module to determine three-dimensional angularity of the to-be-detected particles. By application of the microscope technique to particle morphological feature detection, accuracy in representation of particle angularity is improved.
Owner:HUAQIAO UNIVERSITY

Tie line power safety domain characterization method considering new energy uncertainty

The invention discloses a tie line power safety domain characterization method considering new energy uncertainty. The tie line power safety domain characterization method mainly comprises a tie linepower safety domain characterization method considering new energy uncertainty based on a probability density function and the tie line power safety domain characterization method considering new energy uncertainty based on an interval number. According to the method, the uncertainty of new energy can be fully considered, and the characterization precision of the joint line power safety domain isimproved.
Owner:CHONGQING UNIV

Modeling method of asymmetric hysteresis model

The invention discloses a modeling method of an asymmetric hysteresis model, and relates to the field of parameter identification and compensation of a hysteresis nonlinear model. The problem that inthe prior art, the depicting degree of the actual asymmetric hysteresis characteristic is not ideal enough, and the approximation degree of the depicted actual asymmetric hysteresis characteristic islow is solved. The method comprises the following steps: firstly, identifying a symmetric hysteresis model through an input voltage vector X and an output displacement vector Y, and then identifying anonlinear correction curve h (x) according to the input voltage vector X, the output displacement vector Y, a rising curve f (x) of the symmetric hysteresis model and a falling curve g (x) of the symmetric hysteresis model; and finally, correcting the symmetric hysteresis model through the nonlinear correction curve h (x), thereby obtaining an asymmetric hysteresis model, and completing the establishment of the asymmetric hysteresis model. The method is mainly used for describing the asymmetric hysteresis characteristic of the piezoelectric ceramic.
Owner:HARBIN INST OF TECH

Portable grating ruler main ruler engraving device and engraving method thereof

The invention discloses a portable grating ruler main ruler engraving device and an engraving method thereof. The portable grating ruler main ruler engraving device comprises a first electromagnet, a supporting rod, a precise injection pump, an X-axis linear guide rail, a Y-axis linear guide rail, a control system, a high-voltage direct current power source, a rotary disc, an extensible system and a second electromagnet; the X-axis linear guide rail is installed right above the first electromagnet; the rotary disc is fixed under the X-axis linear guide rail; the Y-axis linear guide rail, the extensible system and the second electromagnet are sequentially arranged below the rotary disc from top to bottom; the first electromagnet is provided with a straight groove; the precise injection pump is installed on the Y-axis linear guide rail; an injection needle is arranged below the precise injection pump; polymer solution is installed inside the precise injection pump; a positive electrode of the high-voltage direct current power source is connected with the injection needle; a negative electrode is connected with the ground. The portable grating ruler main ruler engraving device is large in engraving area, high in engraving accuracy, skillful in design, simple in structure, small in size, capable of being detached and assembled, convenient to carry and move and widely applied to the field of engraving of a grating ruler.
Owner:GUANGDONG UNIV OF TECH

Ultrahigh-precision multilayer film thickness drift error calibration method

ActiveCN112179622AImprove characterization accuracyAvoid introducing additional small errorsTesting optical propertiesRayMaterials science
The invention relates to an ultrahigh-precision multilayer film thickness drift error calibration method, which comprises the steps of of alternately moving a substrate to a sputtering region of two target materials for plating a multilayer film, and plating a first periodic multilayer film; enabling the substrate to be far away from the sputtering region, continuing sputtering the target materials, and simulating the plating process of the target periodic multilayer film; alternately moving the substrate plated with the first periodic multilayer film to the sputtering region again, and plating a second periodic multilayer film to form a calibration sample; and performing an X-ray grazing incidence reflection test on the plated calibration sample under fixed X-ray energy to obtain a test reflectivity curve, and obtaining a multilayer film drift error from the beginning to the end based on comparison between the test reflectivity curve and the simulated reflectivity curve, wherein the number of film pairs of the first periodic multilayer film and the second periodic multilayer film is 1 / 10-1 / 5 of the number of film pairs of the target periodic multilayer film. Compared with the prior art, the method has the advantages of high precision, small influence of instrument conditions and the like.
Owner:TONGJI UNIV

Digital modeling method and device for continuous shaft of deep reservoir

The invention discloses a digital modeling method and device for a continuous shaft of a deep reservoir. The method comprises the following steps of calculating the volume content of stratum mineral components according to a gamma-ray spectrum acquired by ECS, calculating the rock porosity according to the volume content of the stratum mineral components, carrying out full-diameter digital core modeling, matching the rock porosity and the ore group component proportion obtained by calculating the corresponding depth of the rock core with the full-diameter digital rock core, and performing deep reservoir continuous shaft digital modeling according to the rock porosity data of each layer section and the matched full-diameter digital core. In the way, well logging interpretation results are matched with multi-scale digital cores, and well logging and CT cross-scale joint description of deep reservoir continuous shaft digital modeling is achieved.
Owner:NORTHEAST GASOLINEEUM UNIV

Soft tissue elasticity and viscoelasticity characterization method and device based on ultrasound elastography

The invention discloses a soft tissue elasticity and viscoelasticity characterization method and device based on ultrasonic elastography, wherein the method includes: simulating ultrasonic elastography by finite element method to obtain training data of artificial neural network; Data pre-processing, so that the training data contains effective information that meets preset conditions, and obtain a pre-processed feature map; train the pre-processed feature map to obtain a representation that satisfies the preset neural network effect Neural Networks of Soft Tissue Elasticity and Viscoelasticity. This method has the advantages of high characterization accuracy, good robust performance, and large optimization space, and has good application prospects and room for improvement.
Owner:TSINGHUA UNIV

Method of representing extrusion pressure via three-point process based on Benbow-Bridgwater model

The invention discloses a method of representing extrusion pressure, in particular to a method of representing extrusion pressure via a three-point process based on Benbow-Bridgwater model; the method comprises the main steps of (1) acquiring extrusion pressure Pi via three-point testing; (2) calculating average extrusion pressure P0 when length-to-diameter ratio of a nozzle is equal to zero; (3) acquiring an analytical model for representing extrusion pressure via the three-point process. Extrusion pressure representation is one of the most key factors to successfully achieve the material extrusion technique or not; in traditional representation methods, a single-point method is used to estimate extrusion pressure when the length-to-diameter ratio of the nozzle is zero, and great errors are caused. In order to solve the problems, for example, traditional representation methods are low in precision, optimization of material extrusion systems and process parameters is not favored, and extrusion precision is affected, the simple, convenience and practical method for representing extrusion pressure is provided; extrusion pressure representing precision is improved, and the method may act as a common method of representing extrusion pressure.
Owner:NANJING AGRICULTURAL UNIVERSITY

Non-seismic data volume processing method and apparatus

The embodiment of the invention provides a non-seismic data volume processing method and an apparatus. The method includes: obtaining the layer speed of a stratum corresponding to each non-seismic data point in a non-seismic data volume; and regarding each non-seismic data point in the non-seismic data points as a to-be-processed data point, dividing the stratum depth of the to-be-processed data point by the layer speed of the stratum of the to-be-processed data point and obtaining a time value corresponding to the to-be-processed data point in order to convert the non-seismic data volume in a depth domain to a data volume in a time domain. According to the method and the apparatus, the three-dimensional electrical data volume in the depth domain is converted to the data volume in the time domain, three-dimensional seismic and three-dimensional electrical combined inversion can be realized by employing the three-dimensional electrical data volume in the time domain and the three-dimensional seismic data volume in the time domain, compared with the realization of the three-dimensional seismic and three-dimensional electrical combined inversion by employing the three-dimensional electrical data volume in the depth domain and the three-dimensional seismic data volume in the time domain, seamless connection of the three-dimensional electrical data volume and the three-dimensional seismic data volume is realized, and the conglomerate carving precision is improved.
Owner:PETROCHINA CO LTD

A testing system and testing method for gearbox mechanical efficiency on a complete vehicle

The invention relates to a testing system and method for the mechanical efficiency of a gearbox on a vehicle. Four wheels of a testing vehicle are each connected with a TPMS, and each TPMS is connected with a TPMS receiver; a first K-type thermocouple is connected with a hub data acquisition instrument; a second K-type thermocouple is connected with a transmission interface of the testing vehicle,and a signal is transmitted to the hub data acquisition instrument. A current sensor and a voltage sensor are connected with a power generator; the TPMS receivers, the hub data acquisition instrument, the current sensor and the voltage sensor are all in signal connection with a controller. The whole-vehicle gearbox mechanical-efficiency testing on a hub test bed has the advantages of convenient operation, controllable loading, reliable testing results and provision of the third party data collection. The mechanical efficiency study uses the whole gearbox as an object, the characterization accuracy is high, the test reliability is improved, and the system and method has important guiding significance for the development of gearboxes.
Owner:ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD

A Tissue Characterization Method Based on Ultrasound Radio Frequency Time Series

The invention discloses an ultrasonic RF (radio frequency) time sequence-based tissue characterization method, which comprises the following steps of 1, feature extraction: performing operations as shown as follows on each tissue sample to obtain corresponding feature vectors; 2, tissue recognition, wherein the step1 comprises the following steps: 1-1, scanning tissues to acquire multiple frames of ultrasonic echo RF signals of the tissues; 1-2, demodulating a certain ultrasonic echo RF signal and displaying a B-mode graph; 1-3, selecting an ROI (region of interest) of which the size is M*N from the B-mode graph; 1-4, taking previous L RF signals from each point in the ROI to construct M*N ultrasonic RF time sequences of which the length is L; 1-5, extracting fractal features, frequency domain features and time domain features of the ultrasonic RF time sequences to obtain the feature vectors of each tissue samples. According to the ultrasonic RF time sequence-based tissue characterization method disclosed by the invention, the features from three angles: fractal, frequency domain and time domain, are extracted based on the ultrasonic RF time sequences, and the tissues are recognized by using a classifier; the ultrasonic RF time sequence-based tissue characterization method can be widely applied to the field of ultrasonic medical detection and ultrasonic tissue characterization, and the like.
Owner:SOUTH CHINA UNIV OF TECH

A Portable Grating Ruler Main Ruler and Its Drawing Method

The invention discloses a portable grating ruler main ruler engraving device and an engraving method thereof. The portable grating ruler main ruler engraving device comprises a first electromagnet, a supporting rod, a precise injection pump, an X-axis linear guide rail, a Y-axis linear guide rail, a control system, a high-voltage direct current power source, a rotary disc, an extensible system and a second electromagnet; the X-axis linear guide rail is installed right above the first electromagnet; the rotary disc is fixed under the X-axis linear guide rail; the Y-axis linear guide rail, the extensible system and the second electromagnet are sequentially arranged below the rotary disc from top to bottom; the first electromagnet is provided with a straight groove; the precise injection pump is installed on the Y-axis linear guide rail; an injection needle is arranged below the precise injection pump; polymer solution is installed inside the precise injection pump; a positive electrode of the high-voltage direct current power source is connected with the injection needle; a negative electrode is connected with the ground. The portable grating ruler main ruler engraving device is large in engraving area, high in engraving accuracy, skillful in design, simple in structure, small in size, capable of being detached and assembled, convenient to carry and move and widely applied to the field of engraving of a grating ruler.
Owner:GUANGDONG UNIV OF TECH
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