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33results about How to "Reduce the impact of calculations" patented technology
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System and method of contactless position input by hand and eye relation guiding
InactiveCN1904806AEnables contactless position inputAdaptableInput/output for user-computer interactionGraph readingVisual technologyMedicine
The invention relates to a discontact location input system and method guided by hand and eye. It includes two CCD video cameras, a large scale display terminal, a computer installed plural image acquisition card. The system uses platform labeling module to label video camera parameter. The location input method includes following steps: full automation video camera demarcating, hand and eye location gathering, and demarcating target point solving. The invention is based on computer vision technology, and has the advantages of visual, accurate and real time.
Owner:SHANGHAI UNIV
Method and device for text clustering
InactiveCN108875049AReduce the impact of calculationsReduce dimensionalitySemantic analysisSpecial data processing applicationsClustered dataFeature vector
Embodiments of the present invention provide a method and a device for text clustering, and relates to the technical field of text processing. After determining k text data which was obtained text feature vector concentrated as the center point of k cluster, and traversing the text feature vectors set, dividing each text datum into the cluster with the highest similarity, and then executing for each cluster: calculating a mutual information between each word in a text data of a cluster and the clustered data in the cluster, and ranking the calculated amount of mutual information, based on a preset evaluation function of the mutual information according to the method. Extracting T words with high mutual information quantity as the feature vector of the text data, and determining an averagevalue of the feature vectors of all text data in the calculated cluster as a new center point of the cluster, until the preset condition is satisfied. The method and device for text clustering reducing the influence of an isolated data point on the calculation of the new center point, and the method is more accurately, and in the condition of cluster characteristics are ensured to be complete, reducing the dimension, so that the calculation efficiency is improved.
Owner:CHINA CONSTRUCTION BANK
Onboard 360-degree around-viewing display method and system
ActiveCN107066954AReduce the impact of calculationsShorten the timeGeometric image transformationScene recognitionCamera imageLookup table
The invention discloses an onboard 360-degree around-viewing display method and system. The method comprises the following steps of: S1, enabling a projection module to subject images acquired by respective cameras to viewpoint transformation by looking up a lookup table and to project the images onto a vehicle top view; S2, subjecting the four camera images to optical alignment by using an exposure gain algorithm; S3, splicing the splicing seams of the images acquired by the adjacent cameras by using a splicing algorithm to obtain the vehicle top spliced view. The method reuses the splicing seam of a last frame when the splicing seam at a certain position is not large in adjacent timing sequential difference so as to reduce an influence of noise on the calculation of the splicing seam greatly for improving stability. In addition, the direct use of the splicing seam of the last frame also shortens the calculation time of splicing seam and improves algorithm efficiency.
Owner:浙江华锐捷技术有限公司
Calculation method for determining heterogeneous rock crack propagation path based on FFT method
InactiveCN111914445AImprove computing efficiencyAccurately reflect the mechanism of fractureDesign optimisation/simulationSpecial data processing applicationsComputational scienceMacroscopic scale
The invention discloses a calculation method for determining a heterogeneous rock crack propagation path based on an FFT method, and compared with an original phase field method based on a finite element framework, the phase field fracture calculation method based on the FFT homogenization method can overcome the defects of the finite element framework, reduce the influence of the size effect on calculation, and improve the number calculation efficiency and reduce the calculatoin cost while ensuring the calculation precision. from the microcosmic perspective, the relation between microcosmic-scale crack development and macroscopic-scale material damage is established through the homogenization theory, the material fracture mechanism can be accurately reflected, and a reliable basis is provided for predicting heterogeneous material fracture. In addition, the calculation method for determining the heterogeneous rock crack propagation path based on the FFT method is easy to program and convenient to implement through a programming language, fracture prediction is conducted through a computer, and the manual calculation amount is greatly reduced.
Owner:HOHAI UNIV
Quasi-static ultrasonic elastography displacement calculation method and device
ActiveCN105748100AReduce the impact of calculationsImprove accuracyUltrasonic/sonic/infrasonic diagnosticsInfrasonic diagnosticsRadio frequency signalTime shifting
The invention discloses a quasi-static ultrasonic elastography displacement calculation method so as to solve the technical problems that linkage is mistaken and two-dimensional cross-correlation research calculated quantity is excessively large due to iteration in the prior art.The embodiment of the invention further provides a corresponding device.According to the feasible embodiment, the method comprises the steps of calculating a central point for any displacement, and utilizing prior time shifting for building an iteration cross-correlation function based on a neighborhood window for iteration cross-correlation calculation; obtaining a cross-correlation reliability exponential value of iteration cross-correlation calculation, and judging whether the cross-correlation reliability exponential value is smaller than a first credible threshold value or not; if the cross-correlation reliability exponential value is larger than or equal to the first credible threshold value, determining transverse time shifting according to the prior time shifting, and determining longitudinal time shifting according to the prior time shifting and an iteration cross-correlation result; if the cross-correlation reliability exponential value is smaller than the first credible threshold value, using two-dimensional comprehensive cross-correlation research inside the neighborhood to obtain the longitudinal time shifting and the transverse time shifting of the central point of displacement calculation; traversing all ultrasonic radio-frequency signals, and generating displacement field distribution of tested biological tissue.
Owner:SONOSCAPE MEDICAL CORP
Navigation satellite integrity key point comprehensive identification method based on grey relational degree
ActiveCN105301602AEfficient Calculation of ReliabilityIntegrity Efficient ComputingSatellite radio beaconingSingle indicatorCrucial point
The invention discloses a navigation satellite integrity key point comprehensive identification method based on a grey relational degree. The invention takes the navigation satellite system as a research object and brings forward three properties of the satellite integrity key point which include node reliability, integrity and topology importance degree, and comprehensively and effectively evaluates the importance of various nodes of the navigation satellite system. The navigation satellite integrity key point comprehensive identification method comprises steps of choosing an appropriate identification index, on the basis, calculating identification index values from the angles of the topology structure, reliability and integrity, performing irrelevant screening on the identification indexes, calculating the weight values of various identification indexes, obtaining a grey relevant value of each node through quantitative calculation and identifying integrity key point. The invention overcomes the influence on the system by node pairs, overcomes the insufficient evaluation which takes the node degree as a single index, effectively identifies the integrity key point and effectively guides the design of the navigation satellite system.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
Method and device for predicting ground leakage fault of train power supply system
ActiveCN109406923AEarth-leakage faulthigh-precisionEffective guidance and schedulingTesting electric installations on transportReliability engineeringSignal acquisition
The invention discloses a method and device for predicting a ground leakage fault of a train power supply system. The method steps include: S1, acquiring an output signal during the movement of the train power supply system in real time; S2, determining whether there is a ground leakage fault according to the output signal obtained in real time, obtaining the target parameter value of the power supply system in a current fault state and the fault data of the target parameter value if so, otherwise obtaining the degradation data of the target parameter value; and S3, obtaining the fault data and the degradation data of the target parameter value in a specified time period, obtaining the degradation trajectory of the target parameter value, and evaluating the degradation trajectory of the target parameter value to predict the fault state of the power supply system. The device includes a signal acquisition module, a fault real-time monitoring module and a fault status prediction module. The method is easy to achieve, can monitor the ground leakage fault of the power supply system and predict the fault state, and achieves high prediction precision.
Owner:ZHUZHOU CSR TIMES ELECTRIC CO LTD
Amplitude and phase correction device and method suitable for three-dimensional camera sonar array signal receiver
ActiveCN110703234AReduce the impact of magnitude measurementsImproved Amplitude Correction AccuracyAcoustic wave reradiationBandpass filteringLow noise
The invention discloses an amplitude and phase correction device and method suitable for a three-dimensional camera sonar array signal receiver. The device mainly comprises a signal source, an analogreceiving module, a signal acquisition and storage module and a signal processing module. The device is characterized in that when amplitude and phase correction is carried out on the three-dimensional camera sonar array signal receiver, the signal source simultaneously inputs in-phase signals with the same amplitude and the frequency being the sonar working frequency in all channels of the analogreceiving module; the analog receiving module carries out low-noise amplification, time gain control and band-pass filtering processing on the signals and outputs the signals to the signal acquisition and storage module; the signal acquisition and storage module carries out A / D sampling, converts the signals into digital signals and stores the digital signals in sampling data; and the signal processing module reads the sampling data, carries out complex demodulation and digital low-pass filtering, obtains amplitude differences between different receiving channels and reference channels by calculating effective values of all channel data, obtains phase differences between all the channels and the reference channels through a complex cross-correlation algorithm, and compensates the amplitude and phase differences.
Owner:杭州瑞利海洋装备有限公司
Flow detection device and method for bathroom
PendingCN107621290AReduce the impactReduce unnecessary wasteVolume/mass flow measurementVolume indication and recording devicesElectric energyDynamo
The invention relates to a flow detection device for a bathroom. The flow detection device is arranged in a pipeline of a bathroom accessory and connected with a power generator in the pipeline of thebathroom accessory, and comprises a controller, a power supply circuit and a flow detection circuit; the power supply circuit is connected with the power generator and the controller separately for supplying electric power generated by the power generator to the controller, the flow detection circuit includes a frequency signal collection circuit for collecting rotation frequency signals of the power generator and a voltage signal collection circuit for collecting output voltage signals of the power generator, the frequency signal collection circuit and the voltage signal collection circuit are both connected between the signal collection end of the power supply circuit and the signal input end of the controller, and the flow detection circuit obtains the rotation frequency signals and voltage signals of the power generator and transmits the signals into the controller so that the controller can obtain water flow data through calculation. By means of the flow detection device for thebathroom, the obtained water flow data is more accurate, and the utilization rate of the power generated by the power generator is high.
Owner:宁波杰敏卫浴科技有限公司
Fogdrop sample image processing method in camera
ActiveCN110490826AHigh degree of intelligenceSolve the problem of bulky and unsuitable for field measurement of spray qualityImage enhancementImage analysisReal time analysisImage segmentation algorithm
The invention discloses a fog drop sample image processing method in a camera, and relates to the field of spray quality detection. The method comprises the following steps: collecting a sample imageuniformly irradiated by a light source; intercepting a sampling image with uniform brightness from the sample image; carrying out bilateral filtering noise reduction and graying processing on the sampled image; correcting the distortion of the grayed image; carrying out adhesion fog drop judgment on the corrected image; fully segmenting and marking the judged adhered fog drops by adopting a morphological opening operation segmentation method; separating and counting the fog drops by using a watershed segmentation method, binarizing the corrected grayscale images, classifying and summing the binary images to obtain the total number of pixel points of the fog drops and the total number of pixel points of the sampled images, and substituting the total number into a formula to calculate a spray quality parameter. The problems that in the prior art, an instrument is heavy, a fogdrop image segmentation algorithm is inaccurate, and noise pixel points reduce result accuracy are solved. The method can be widely applied to real-time analysis of spraying quality in severe field environments.
Owner:HENAN AGRICULTURAL UNIVERSITY
Partial excitation loss fault identification method for pulse loss
ActiveCN111123099AGet Waveform DataReduce the impact of calculationsEmergency protective circuit arrangementsDynamo-electric machine testingComputational physicsPulsed wave
The invention discloses a partial excitation loss fault identification method for pulse loss. According to the partial excitation loss fault identification method, a partial excitation loss fault of pulse loss is identified by analyzing and comparing differences among six pulse waves in one cycle of an excitation voltage, and during comparison, 10% of maximum data is removed from data of each pulse wave, so that the influence of excitation voltage peaks on calculation during rectification and commutation can be reduced; and 50% of minimum data is removed, therefore, sampling data of a normal pulse wave without lost pulse is basically a relatively large positive value, an average value cannot be reduced or even close to 0 due to the excitation voltage negative value part, the average valueof the pulse waves of the lost pulse is generally close to 0 or smaller than 0, a large difference exists between the average value and the pulse waves without the lost pulse, and the difference is used for identifying the excitation loss fault of the partial excitation loss fault.
Owner:NARI TECH CO LTD
CT (Computed Tomography) spatial resolution measurement method for improving disc card method
ActiveCN109884090AReduce the impact of calculationsReasonable and accurate calculationMaterial analysis by transmitting radiationImage resolutionComputing tomography
The invention relates to a CT (Computed Tomography) spatial resolution measurement method for improving a disc card method and belongs to the technical field of processing of images. The method comprises the following steps: S1, installing and starting a CT detection device; S2, carrying out fan-beam ray scanning; S3, rebuilding a two-dimensional image of a disc card by using a fan-beam FBP algorithm according to the obtained projection data; S4, obtaining a denoised grayscale image by using an RTV algorithm; S5, calculating the rebuilt two-dimensional image and the denoised gray image by using the improved disc card method to obtain an average gray value of the edge of the disc card; and S6, calculating ERF and PSF curves to obtain an MTF curve and a CT spatial resolution of the disc card. When the CT spatial resolution measurement method is used for calculating the edge gray value of the disc card, the influence of noise and insufficient card disc production accuracy on calculation of the edge average gray value is reduced, so that a more accurate and reasonable result can be obtained when calculating spatial resolution of a CT system.
Owner:CHONGQING UNIV
Joint rotation center optimization method and equipment based on motion capture point cloud
ActiveCN114565978AReduce the impact of calculationsEliminate dependenciesImage enhancementImage analysisHuman bodyEngineering
The invention discloses a joint rotation center optimization method and equipment based on motion capture point cloud, and belongs to the technical field of motion capture and human muscle-bone modeling. The problem that joint motion parameters calculated based on mark points are sensitive to point pasting errors and have large errors is solved. According to the method, based on the acquired mark point data of the optimized joint and the first bone and the second bone which are respectively connected with the optimized joint in the relative static state and the relative motion state, the mark point data of the first bone in the relative motion state are superposed on the mark point data in the relative static state; based on the corresponding rotation and translation relation, the motion trail of the mark point data is converted into rotation motion of the first bone which is kept still and the second bone around the first bone through the optimized joint; and overlapping the second bone mark point of the current frame with the mark point corresponding to the second bone of the previous frame, and converting the rotation centers of the rotation translation matrixes of all adjacent two frames in the complete gait cycle into an optimization problem to realize optimization. The method is mainly used for joint rotation center optimization.
Owner:THE SECOND PEOPLES HOSPITAL OF SHENZHEN
Rotor grounding protection direct current quantity anti-interference calculation method
ActiveCN111313369ASmall fluctuationReduce the impact of calculationsEmergency protective circuit arrangementsDynamo-electric machine testingElectrical resistance and conductanceInterference resistance
The invention discloses a rotor grounding protection direct current quantity anti-interference algorithm which is used for sampling direct current quantity pre-low-pass filtering such as direct-current voltage and leakage current of a rotor winding and comprises the following steps: firstly, acquiring N sample direct current voltage and sample leakage current before switching of an electronic switch, wherein N accounts for 20-40 percent of the total sample S after low-pass filtering; grouping the sample direct-current voltage and the sample leakage current, calculating the average value of each group of samples, calculating the change rate of the average value of the sample leakage current, sorting the change rates, selecting the average value of the sample leakage current with the minimumcorresponding change rate, and finding out the average value of the sample direct-current voltage at the same moment; and calculating the grounding resistance and the grounding position of the rotoraccording to the average value of the sample leakage current with the minimum change rate and the average value of the direct current voltage at the same moment, thereby effectively reducing the influence of fluctuation and interference on the calculation of the direct current quantity, adding dC voltage drastic fluctuation locking discrimination and effectively reducing the influence of drastic fluctuation and interference on protection logic discrimination.
Owner:NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
System and method of contactless position input by hand and eye relation guiding
InactiveCN100432897CEnables contactless position inputAdaptableInput/output for user-computer interactionGraph readingVisual technologyMedicine
The invention relates to a discontact location input system and method guided by hand and eye. It includes two CCD video cameras, a large scale display terminal, a computer installed plural image acquisition card. The system uses platform labeling module to label video camera parameter. The location input method includes following steps: full automation video camera demarcating, hand and eye location gathering, and demarcating target point solving. The invention is based on computer vision technology, and has the advantages of visual, accurate and real time.
Owner:SHANGHAI UNIV
A Partial Loss of Excitation Fault Identification Method with Pulse Loss
ActiveCN111123099BGet Waveform DataReduce the impact of calculationsEmergency protective circuit arrangementsDynamo-electric machine testingVoltage spikeEngineering
The invention discloses a partial loss of excitation fault identification method for pulse loss. By analyzing and comparing the difference between six pulse waves in one cycle of the excitation voltage, the partial loss of excitation fault for pulse loss is identified. When comparing, for each For the pulse data, remove the largest 10% data, which can reduce the impact of the excitation voltage peak on the calculation during rectification and commutation; remove the smallest 50% data, so that the sampling data of the normal pulse wave without missing pulses is basically larger The positive value of the positive value, the average value will not decrease or even close to 0 due to the negative part of the excitation voltage, while the pulse wave average value of the missing pulse is generally close to 0 or less than 0, which is quite different from the pulse wave without missing pulses. Use this difference to identify partial loss of field faults where pulses are missing.
Owner:NARI TECH CO LTD
Coupon limit dynamic adjustment method based on user behavior characteristics
ActiveCN113449818AEfficient useImprove universalityCharacter and pattern recognitionMarketingOperating variablesPersonalization
The invention discloses a coupon limit dynamic adjustment method based on user behavior characteristics, and the method comprises the following steps: 1, collecting and recording operation variables of a user for a commodity in a time period t, and carrying out the combination of the operation variables to form a user behavior weight in the time period t; 2, calculating a user adjustment weight according to the coupon shopping information of the user; 3, performing clustering analysis on the personal information of each user to obtain a feature weight of each user; 4, calculating an incentive score of each user according to a formula in combination with the behavior weight, the adjustment weight and the feature weight; and 5, dividing the incentive scores and the preferential quotas of the users into M grades, enabling the divided incentive scores and preferential quotas to be in one-to-one correspondence, and finally obtaining preferential quota grades of the users. According to the invention, the incentive level of the user is calculated according to the behavior characteristics of the user, and different preferential quotas are obtained according to the level, so that different users can obtain different preferential quotas of the same kind of coupons, and personalized user incentive is formed.
Owner:四川特号商盟科技有限公司
Rotor grounding protection DC amount mean value calculating data selection method
ActiveCN108981755AReduce the impact of calculationsSmall fluctuationElectrical testingMeasurement arrangements for variableData selectionComputer science
The invention discloses a rotor grounding protection DC amount mean value calculating data selection method. The rotor grounding protection DC amount mean value calculating data selection method selects a data window by using the principle that the standardized data variance is the smallest for each DC amount involved in the calculation, selects a data window with less fluctuation and less interference, and removes (1-T%) / 2 of the data of the maximum and the minimum for the selected data windows, and selects the intermediate T% data to calculate the average value of the DC amount, so as to further reduce the influence of fluctuations and interference on the calculation of the average value of the DC amount.
Owner:NARI TECH CO LTD
Optimization method and device for joint rotation center based on motion capture point cloud
ActiveCN114565978BReduce the impact of calculationsEliminate dependenciesImage enhancementImage analysisHuman bodyRelative motion
A joint rotation center optimization method and device based on motion capture point cloud belong to the technical field of motion capture and human musculoskeletal modeling. In order to solve the problem that the joint motion parameters calculated based on the marked points are sensitive to the sticking error, there is a large error. Based on the collected optimized joint and the marked point data of the first bone and the second bone respectively connected with the optimized joint in a relative static state and a relative motion state, the marked point data in the relative motion state of the first bone is superimposed to a relatively static state Lower the marked point data, and based on the corresponding rotation-translation relationship, the movement trajectory of the marked point data is converted into the first bone remains stationary, the second bone rotates around the first bone through the optimized joint; the second bone of the current frame is marked The point coincides with the marked point corresponding to the second bone of the previous frame, and transforms the rotation centers of the rotation and translation matrices of all adjacent two frames in the complete gait cycle into an optimization problem to achieve optimization. Mainly used for joint rotation center optimization.
Owner:THE SECOND PEOPLES HOSPITAL OF SHENZHEN
Acid bath wet etching process
ActiveCN109560025BAchieve continuous etchingReduce the impact of calculationsSemiconductor/solid-state device testing/measurementSemiconductor/solid-state device manufacturingPhysical chemistrySilicon chip
Owner:SHANGHAI HUALI MICROELECTRONICS CORP
A Calculation Method for Anti-interference of DC Flow in Rotor Grounding Protection
ActiveCN111313369BSmall fluctuationReduce the impact of calculationsEmergency protective circuit arrangementsDynamo-electric machine testingElectrical resistance and conductanceInterference resistance
The invention discloses a DC flow anti-interference algorithm for rotor grounding protection. In the invention, the DC voltage and leakage current of the rotor winding DC voltage and leakage current are pre-filtered and sampled, and N samples of DC voltage and sample leakage are first obtained before the switching of the electronic switch. Current, N accounts for 20% to 40% of the total sample S after low-pass filtering; then group the sample DC voltage and sample leakage current, calculate the average value of each group of samples, calculate the rate of change of the average value of the sample leakage current, and calculate the change rate According to the average value of the sample leakage current with the smallest rate of change and the average value of the DC voltage at the same time Value calculation of rotor grounding resistance and grounding position, effectively reducing the impact of fluctuations and interference on DC flow calculation; increasing the blocking judgment of severe fluctuations in DC voltage, effectively reducing the impact of severe fluctuations and interference on protection logic judgment.
Owner:NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
Method and device for predicting earth leakage fault of train power supply system
ActiveCN109406923BEarth-leakage faulthigh-precisionEffective guidance and schedulingShort-circuit testingTesting electric installations on transportState predictionPredictive methods
The invention discloses a method and device for predicting a ground leakage fault of a train power supply system. The steps of the method include: S1. obtaining an output signal during the movement of the train power supply system in real time; S2. identifying whether there is a ground leakage fault according to the output signal obtained in real time, If a fault is identified, obtain the target parameter value of the power supply system under the current fault state, and obtain the fault data of the target parameter value, otherwise obtain the degradation data of the target parameter value; S3. Obtain the fault data of the target parameter value within the specified time period respectively , degradation data, obtain the degradation trajectory of the target parameter value, and evaluate the degradation trajectory of the target parameter value to predict the fault state of the power supply system; the device includes a signal acquisition module, a fault real-time monitoring module and a fault state prediction module. The invention has the advantages of simple implementation method, capable of realizing ground leakage fault monitoring and fault state prediction of the power supply system, and has the advantages of high prediction accuracy.
Owner:ZHUZHOU CSR TIMES ELECTRIC CO LTD
A vehicle-mounted 360-degree surround view display method and system
ActiveCN107066954BReduce the impact of calculationsShorten the timeGeometric image transformationScene recognitionCamera imageComputer graphics (images)
The invention discloses a vehicle-mounted 360-degree surround view display method and system. The method includes the following steps: S1: the projection module transforms the viewpoint of the image collected by each camera through a lookup table, and projects it to the top view of the vehicle; S2: uses the exposure gain algorithm to perform optical alignment of the four camera images; S3: uses stitching The algorithm stitches the stitching seams of the images collected by adjacent cameras to obtain the mosaic map of the vehicle's top view. The present invention reuses the stitching seam of the previous frame when there is little difference in the adjacent timing sequence of the stitching seam at a certain position, which greatly reduces the influence of noise on the seam calculation, thereby increasing stability, and directly using The stitching seam of the previous frame also reduces the time for stitching seam calculation and improves the algorithm efficiency.
Owner:浙江华锐捷技术有限公司
Error handling method for calculating hrv signal in human body impedance signal
ActiveCN109998513BReduce the impact of calculationsImprove usabilityCharacter and pattern recognitionSensorsHuman bodySignal quality
The invention discloses an error processing method for calculating an HRV signal in a human body impedance signal. In the method, the RRI error identification unit first obtains the position information of the signal where the RRI may be incorrectly identified; The RRI information sets the quality level of the signal to calculate the interpolation information, and finally the interpolation unit performs interpolation according to the calculated interpolation information to obtain a new reliable RRI sequence. The present invention can be used as an effective method to reduce the impact of RRI error recognition with interference impedance signal on the calculation of HRV algorithm, so that the HRV calculation of impedance method can reach the standard of HRV calculation of electrocardiography method, and can improve the usability of human body impedance measurement signal and correct the error. The accurate identification of the RRI sequence can minimize the impact of the wrong RRI sequence on the subsequent HRV calculation.
Owner:CHIPSEA TECH SHENZHEN CO LTD
A comprehensive identification method for the integrity key points of navigation satellites based on grey correlation degree
ActiveCN105301602BEfficient Calculation of ReliabilityIntegrity Efficient ComputingSatellite radio beaconingNODALResearch Object
The invention discloses a navigation satellite integrity key point comprehensive identification method based on a grey relational degree. The invention takes the navigation satellite system as a research object and brings forward three properties of the satellite integrity key point which include node reliability, integrity and topology importance degree, and comprehensively and effectively evaluates the importance of various nodes of the navigation satellite system. The navigation satellite integrity key point comprehensive identification method comprises steps of choosing an appropriate identification index, on the basis, calculating identification index values from the angles of the topology structure, reliability and integrity, performing irrelevant screening on the identification indexes, calculating the weight values of various identification indexes, obtaining a grey relevant value of each node through quantitative calculation and identifying integrity key point. The invention overcomes the influence on the system by node pairs, overcomes the insufficient evaluation which takes the node degree as a single index, effectively identifies the integrity key point and effectively guides the design of the navigation satellite system.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
A Dynamic Adjustment Method of Coupon Amount Based on User Behavior Characteristics
ActiveCN113449818BMaximize the incentive effectEasy to useCharacter and pattern recognitionMarketingPersonalizationEngineering
The invention discloses a method for dynamically adjusting the amount of coupons based on user behavior characteristics. The method includes: 1. Collecting and recording the user's operation variables on commodities in the t time period, and combining them to form the user behavior weight in the t time period ; 2. Calculate the user adjustment weight according to the user's coupon shopping information; 3. Perform cluster analysis on each user's personal information to obtain the feature weight of each user; 4. According to the formula and combine the behavior weight, adjust the weight and features Calculate the incentive score of each user by weight; 5: Divide the user's incentive score and preferential quota into M levels, and correspond the divided incentive scores and preferential quota one by one, and finally obtain the user's preferential quota level. The invention calculates the user's incentive level according to the user's behavior characteristics, and obtains different preferential amounts according to the level, so that different users can obtain different preferential amounts of the same type of coupons, forming personalized user incentives.
Owner:四川特号商盟科技有限公司
A Method for Measuring CT Spatial Resolution by Improved Disk Carding Method
ActiveCN109884090BReduce the impact of calculationsReasonable and accurate calculationMaterial analysis by transmitting radiationImaging processingImage resolution
The invention relates to a method for measuring CT space resolution by improving the disk clamping method, and belongs to the technical field of image processing. The method includes: S1: installing and starting the CT detection device, S2: fan-beam ray scanning; S3: reconstructing the two-dimensional image of the disc card: reconstructing the two-dimensional image of the disc card by using the fan-beam FBP algorithm according to the obtained projection data; S4: Use the RTV algorithm to obtain the denoised grayscale image; S5: Use the improved disc card method to calculate the reconstructed two-dimensional image and the denoised gray image, and obtain the average gray level of the edge of the disc card value; S6: Calculate the ERF and PSF curves to obtain the MTF curve and CT spatial resolution of the disc card. The present invention reduces the influence of noise and insufficient manufacturing precision of the disc card on the calculation of the average gray value of the edge when calculating the gray value of the edge of the disc card, thereby having more accurate and reasonable results when calculating the spatial resolution of the CT system.
Owner:CHONGQING UNIV
Flow valve opening adjustment method and system based on parameter update and correction
ActiveCN113987404BImprove opening calculation accuracyReduce the impact of calculationsDesign optimisation/simulationCAD numerical modellingOpen adjustmentStream flow
The invention discloses a flow valve opening adjustment method and system based on parameter updating and correction. The method calculates the first parameter value of the constructed flow valve opening calculation model, and incorporates artificial adjustment of the flow valve in the parameter updating and correction. In addition, the second parameter value is updated and corrected based on the calculated trend of the opening adjustment error changing with the flow value, which reduces the influence of fluid temperature and other factors on the calculation of the model parameter value, and improves the calculation of the opening adjustment parameter value. precision. In addition, after the flow valve is put into a new application scenario, it only needs to be manually adjusted once to adjust the corresponding opening of the flow valve that meets different flow requirements to solve the first parameter value of the model opening adjustment parameter. The acquisition, calculation and update of the second parameter value and the correction process are completely automatic, which solves the trouble of sending a special person to the site to adjust the opening of the flow valve every time when the flow rate is to be changed, and the problem of relying too much on manual adjustment experience.
Owner:杭州丹纳计量科技有限公司
Method and device for calculating displacement of quasi-static ultrasonic elastography
ActiveCN105748100BReduce the impact of calculationsImprove accuracyUltrasonic/sonic/infrasonic diagnosticsInfrasonic diagnosticsRadio frequency signalTime shifting
Owner:SONOSCAPE MEDICAL CORP
Data selection method for calculation of average value of DC flow in rotor grounding protection
ActiveCN108981755BReduce the impact of calculationsSmall fluctuationMeasurement arrangements for variableShort-circuit testingData selectionComputational physics
The invention discloses a rotor grounding protection DC amount mean value calculating data selection method. The rotor grounding protection DC amount mean value calculating data selection method selects a data window by using the principle that the standardized data variance is the smallest for each DC amount involved in the calculation, selects a data window with less fluctuation and less interference, and removes (1-T%) / 2 of the data of the maximum and the minimum for the selected data windows, and selects the intermediate T% data to calculate the average value of the DC amount, so as to further reduce the influence of fluctuations and interference on the calculation of the average value of the DC amount.
Owner:NARI TECH CO LTD
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