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58results about How to "Narrow down the range of values" patented technology
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G2o-based SLAM rear end optimization algorithm method
InactiveCN104850615ANarrow down the range of valuesImprove convenienceNavigational calculation instrumentsCharacter and pattern recognitionAlgorithmPath condition
The invention discloses a g2o-based SLAM rear end optimization algorithm method, pose node information of a robot is used as input data, a weight factor is added for each edge by focusing closed loop restriction with a rear end optimization algorithm, a value of the weight factor is obtained according to a mathematic relation between the derived weight factor and an information matrix, and after the read end optimization algorithm, the pose node information of the robot is corrected; a built-in optimization strategy of g2o is further optimized based on a g2o platform by a least square method, and a post node path more according with an actual path condition is constructed. The g2o-based SLAM rear end optimization algorithm method adopts a DCSI algorithm, and is used for solving the problem of robutness rear end optimization, complexity is reduced, operation time is reduced and the rate of convergence rate is improved. The g2o-based SLAM rear end optimization algorithm method has important meaning in correction and optimization of a topological map in an unknown environment.
Owner:XIDIAN UNIV
Image classification method and device and computing equipment
InactiveCN106503656AAlleviate the problem of sensitivity to neighborhood radius valuesImprove accuracyCharacter and pattern recognitionFeature vectorClassification methods
The invention discloses an image classification method which is performed in computing equipment and suitable for classifying images according to the faces in the images. The method comprises the steps that multiple images to be classified are acquired; the face in each image is recognized, and each face is corresponding to one face feature vector; the face feature vectors are clustered by using a DBSCAN algorithm based on a first neighborhood radius so that a first clustering result is obtained; the class clusters in the first clustering result are combined according to a second neighborhood radius so that a second clustering result is obtained, wherein the second neighborhood radius is greater than the first neighborhood radius; if the second clustering result includes outliers, the outliers are classified according to a third neighborhood radius so that a third clustering result is obtained, wherein the third neighborhood radius is greater than the first neighborhood radius; and the multiple images to be classified are classified according to the third clustering result. The invention also discloses an image classification application capable of implementing the method and the computing equipment comprising the image classification application.
Owner:XIAMEN MEITUZHIJIA TECH
Data broadcasting method and device
ActiveCN111385013AReduce bit overheadReduce the number of bitsSynchronisation arrangementRadio transmissionTransmission time delayTerminal equipment
The invention provides a data broadcasting method which is applied to a satellite communication system and can reduce the expenditure of physical resources when a satellite base station broadcasts data. The method comprises that: a satellite base station acquires a plurality of data needing to be broadcasted, wherein the multiple pieces of data are the same data in Doppler frequency offset compensation values, Doppler frequency offset change rates, transmission time delays, transmission time delay change rates, time advances TA, TA change rates and angles of the multiple beams respectively corresponding to the multiple beams generated by the satellite base station; the satellite base station determines reference data and offset of each datum in the plurality of data relative to the reference data according to the plurality of data; and the satellite base station sends first indication information and a plurality of pieces of second indication information to the terminal equipment, thefirst indication information is used for indicating the reference data, and each piece of second indication information is used for indicating offset of one piece of data in the plurality of pieces ofdata relative to the reference data.
Owner:HUAWEI TECH CO LTD
Malicious code family clustering method and system
ActiveCN110458187ANarrow down the range of valuesReduce computing expensesCharacter and pattern recognitionPlatform integrity maintainanceNon linear functionsConditional probability
The invention discloses a malicious code family clustering method and system, and the method comprises the steps: carrying out the dimension reduction visualization of an original malicious code execution sequence through employing a T-SNE algorithm, which specifically comprises the steps: carrying out the modeling of the neighbor distribution of each data point through employing the T-SNE algorithm, wherein neighbors refer to set of data points which are close to each other; constructing a model, and mapping data points to corresponding probability distribution through nonlinear function transformation; training the constructed model, and calculating the gradient of a loss function by calculating the conditional probability of a low-dimensional space; adopting a K-means algorithm to cluster malicious code families, which specifically comprises the steps that the classification number K and a clustering center are determined, cluster division is performed on all the objects by calculating the distances between the objects and the clustering center, and a new clustering center is recalculated, and whether conditions are met or not is judged. The system comprises a dimension reduction visualization module and a clustering module. According to the method, the problem of how to determine k in the K-means algorithm is solved, and the accuracy of malicious code family clustering is improved.
Owner:GUANGZHOU UNIVERSITY
Synthetic steering vector based beam forming meter-wave radar height measurement method
InactiveCN103293526ASolve the limitation of low elevation angle altimetryImprove ability to handle goalsRadio wave reradiation/reflectionElevation angleTarget signal
The invention discloses a synthetic steering vector based beam forming meter-wave radar height measurement method, and mainly aims to solve the problems of large signal processing operation and computational complexity of the prior art during height measurement. The method includes extracting a target signal from a radar echo and determining a target elevation angle searching range; building a radar wave reflection model and computing ground arc length between a reflection point and a radar center and ground arc length between the reflection point and a target by a searched elevation angle; computing equivalent heights of the target and the radar center and then computing a reflection angle and wave-path difference between a reflection wave and a direct wave; computing a synthetic steering vector; and after data beam forming of an echo, selecting an angle corresponding to a maximum normalization power value as a target elevation angle and computing the target height. Beam forming and the synthetic steering vector are combined, the target reflection model is simplified, elevation angle estimation precision of a meter-wave radar is guaranteed, computation speed of meter-wave radar height measurement is increased, a computational process for height measurement is simplified, and real-time signal processing of the meter-wave radar is easier.
Owner:XIDIAN UNIV
GNSS multipath effect correction method based on BP neural network technology
ActiveCN109738926AImpaired exerciseCyclical volatility improvedElectrical/magnetic solid deformation measurementSatellite radio beaconingSignal-to-quantization-noise ratioCorrection method
The invention provides a GNSS multipath effect correction method based on a BP neural network technology. The method sequentially comprises the following steps of multipath error extraction, sample pre-selection, sample preprocessing, sample training, network topology determination, data storage, data post-processing and model updating, wherein modeling is carried out on multipath errors by meansof forward propagation of signals and reverse propagation of the errors of a BP neural network algorithm, a motion condition of a satellite, a satellite elevation, a signal-to-noise ratio and multipath effect errors caused by ambient conditions around monitoring points can be effectively weakened, and meanwhile, periodic fluctuations in directions X, Y and Z of a monitoring station are remarkablyimproved through trained results, a model is dynamically updated according to the new multipath error data, and the periodic errors caused by multipath effects on the monitoring points can be weakenedto the maximum extent.
Owner:HUNAN LIANZHI BRIDGE & TUNNEL TECH
Fuel cell system, method and program of determining cause of negative voltage, and storage medium storing program
InactiveUS20130189596A1Accurately determineAccurate detectionFuel cell auxillariesMaterial analysis by electric/magnetic meansFuel cellsEngineering
A fuel cell system includes a fuel cell; a voltage measuring portion that measures a voltage of the fuel cell; an electric current adjusting portion that adjusts an electric current flowing in the fuel cell; an electric current-voltage characteristic information obtaining portion that controls the electric current adjusting portion to change the electric current, and obtains electric current-voltage characteristic information that is information indicating a correspondence relation between an electric current value and a voltage value measured by the voltage measuring portion; and a negative voltage cause determining portion that determines, if the voltage of the fuel cell is a negative voltage, a cause of the negative voltage of the fuel cell, based on the obtained electric current-voltage characteristic information.
Owner:TOYOTA JIDOSHA KK
Turn-on voltage testing method of switching tube
ActiveCN103995222ANarrow down the range of valuesAdd test methodIndividual semiconductor device testingTest efficiencyLower limit
The invention discloses a turn-on voltage testing method of a switching tube. The testing method comprises the following steps that: an initial testing voltage upper limit, an initial testing voltage lower limit, and a target current are set; the testing voltage is set as a value that is obtained by multiplying a sum of the initial testing voltage upper limit and the initial testing voltage lower limit by a compressibility coefficient, and a drain terminal current of the switching tube is tested; a relation between the drain terminal current and the target current is determined; if the drain terminal current is larger than the target current, the testing voltage is used as a new testing voltage upper limit, and if the drain terminal current is less than the target current, the testing voltage is used a new testing voltage lower limit; the above steps are repeated by using the new testing voltage upper limit or the new testing voltage lower limit and preset repletion times so as to obtain a first testing voltage upper limit and a first testing voltage lower limit; and a turn-on voltage of the switching tube is tested and obtained in a range from the first testing voltage lower limit to the first testing voltage upper limit. Compared with the traditional testing method, the provided method has the high testing efficiency.
Owner:CSMC TECH FAB2 CO LTD
Method and device for adjusting test parameters and medium
ActiveCN110032483ANarrow down the range of valuesIn line with the actual test rangeFaulty hardware testing methodsEnergy efficient computingTested timeSignal generator
The embodiment of the invention discloses a method and device for adjusting test parameters and a computer readable storage medium, and the method comprises the steps: setting current parameters of 3Dsweep frequency load according to a pre-defined current value; and performing 3D frequency sweeping and loading on the memory to be tested to obtain a pull-load current. The value range of the current is greatly reduced through the pull-load current obtained after 3D frequency sweeping, the pull-load current serves as a test parameter, the test time can be saved, and the test accuracy is improved. The more accurate the rise time is, the more accurate the test result is. the rise time of the signal generator is determined according to the corresponding relationship between the voltage and thepull-load current and the voltage conversion rate. The pull-load current obtained through 3D frequency sweeping and the rising time obtained through calculation serve as test parameters of the signalgenerator, the test parameters better conform to the actual test range of the to-be-tested memory, and therefore the signal generator conducts pull-load test on the to-be-tested memory according to the test parameters, and the obtained test result is more accurate.
Owner:SUZHOU LANGCHAO INTELLIGENT TECH CO LTD
Memory erasing method and device
PendingCN109872756ARaise the threshold voltageNarrow down the range of valuesRead-only memoriesElectricityComputer architecture
The embodiment of the invention discloses a memory erasing method and device. The memory erasing method comprises the following steps: detecting a power-on signal of a memory; and controlling a plurality of memory blocks in the memory to carry out over-erase verification operation at the same time, so that the threshold voltages of all memory units in the memory are greater than zero voltage. According to the technical scheme provided by the embodiment of the invention, the problems of serious electric leakage of the storage unit and influence on normal use caused by abnormal power failure ofthe existing memory can be solved.
Owner:GIGADEVICE SEMICON (BEIJING) INC
Method and device for calculating fixed point digital signal common function value
InactiveCN1945488ANarrow down the range of valuesGuaranteed accuracyDigital function generatorsDigital signal processingComputer science
The invention discloses a method of seeking the common function of the fixed-point digital signal. This method is based on word length of the pre-determined fixed-point digital signal, the number of the low-order data which is prepared to abandon, and the type of commonly used functions to establish the corresponding relationship between the medium result and the index for looking up table, which includes the following steps: A. integrating the input data of the common function and gaining the integrated data, B. requiring the index according to the integrated data and obtaining the medium result according to the index and the relationship between pre-established medium result and index, C. calculating the common function of the input data according to medium results. The invention also discloses a device of seeking such common function. The application of this invention can improve the accuracy of the fixed-point digital signal processing, cut down the space of storing the corresponding relationship between the medium result and the index.
Owner:VIMICRO CORP
Gas turbine dynamic working condition database sample point selection method
ActiveCN106840685ANarrow down the range of valuesSmall scaleInternal-combustion engine testingEngineeringWorkload
The invention relates to a gas turbine dynamic working condition database sample point selection method. A gas turbine is a three-shaft type gas turbine with an adjustable power turbine guide vane. The gas turbine adopted in the method is structurally characterized in that the power turbine inlet guide vane is adjustable, and the gas turbine is provided with a high pressure shaft, a low pressure shaft and a power turbine shaft to form the three-shaft type structure. The method comprises the steps of calculating and analyzing the influence caused by turbine rotating speed on the gas turbine, calculating and analyzing the correspondence of rotating speeds of the high and low pressure shafts corresponding to the guide vane angles under the steady-state condition, calculating the changing range of the low pressure shaft rotating speed in the acceleration and deceleration process, according to the calculation result, selecting sample points, utilizing a gas turbine simulation model for obtaining sample points, forming a gas turbine dynamic working condition database and the like. According to the gas turbine dynamic working condition database sample point selection method, the power turbine guide vane angle changing phenomenon is considered by means of operating characteristics of the gas turbine, the sample point valuing range is reasonable reduced, the sample scale is greatly reduced, and workloads are reduced.
Owner:INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI +1
Water environment mathematical model water quality parameter uncertainty and sensitivity analysis method
InactiveCN109858779ANarrow down the range of valuesHigh sensitivityGeneral water supply conservationResourcesSensitivity analysisWater quality modelling
The invention discloses a water environment mathematical model water quality parameter uncertainty and sensitivity analysis method, which comprises the following steps of: screening water quality parameters to be analyzed and prior distribution characteristics, and taking a value range; extracting a proper amount of parameter groups by using a Latin hypercube sampling method; calculating a water quality simulation result of the water quality parameter through the water environment mathematical model; selecting a specific confidence interval as an upper boundary and a lower boundary for judgingan uncertainty interval, defining an interval coverage rate, an uncertainty interval width and a relative uncertainty interval width, and evaluating the uncertainty of the water environment mathematical model; measuring the sensitivity of the water quality parameters through a sensitivity analysis chart; and finally, optimizing the value range of the sensitive water quality parameters through parameter posteriori distribution. Water quality parameter evaluation is more comprehensive, and the problem of same effect of different parameters is effectively solved; parameter sensitivity is quantified, and parameter posteriori distribution is obtained, and the value range of sensitive parameters is narrowed, and a basis is provided for parameter constant value selection and model sensitivity improvement.
Owner:HOHAI UNIV
Classifier generation method, atrial fibrillation detection device and storage medium
PendingCN109960968AReduce dimensionalityNarrow down the range of valuesCharacter and pattern recognitionHeart beatSimple machine
The invention provides a classifier generation method, an atrial fibrillation detection device and a storage medium. The atrial fibrillation detection device and the storage medium carry out the atrial fibrillation / non-atrial fibrillation classification detection on detected signals through the classifier. The generation method of the classifier comprises the following steps of extracting a cardiac interval of a cardiac signal segment of a pre-labeled type; calculating a variation value of the heart beat interval; grouping the plurality of heart beat interval variation values, and extracting the frequency of each group of data as a feature vector; and carrying out machine learning training on the mark type and the feature vector to generate the classifier. According to the classifier generation method provided by the invention, the dimension of the original feature can be reduced, the discrimination of the sample and the robustness to noise are improved, and the classifier can be quickly obtained through training by adopting a simple machine learning model.
Owner:成都心吉康科技有限公司
Magnetotelluric two-dimensional inversion method based on tabu search
ActiveCN112666612ANarrow down the range of valuesImprove computing efficiencyMaterial resistanceElectric/magnetic detectionParametric searchWell logging
The invention discloses a magnetotelluric two-dimensional inversion method based on tabu search. The method comprises the steps of building a resistivity tabu search list through employing the drilling, logging, geological plotting and regional geologic map, proposing a tabu search principle, and reducing the resistivity parameter search range before magnetotelluric inversion iteration, constructing an inversion initial model according to the tabu search table, then performing two-dimensional forward modeling and residual error calculation, then judging whether a target function sets a minimum value or not, and if so, outputting stratum resistivity and thickness values, and if not, modifying the inversion model according to the sensitivity matrix, and continuously iterating until the target function reaches a set minimum value. An interchange theorem is adopted in sensitivity matrix calculation, grid nodes and measuring points are interchanged, forward modeling one-time solving is utilized, the sensitivity of multiple nodes is obtained, the calculated amount is reduced, and the accuracy and inversion efficiency of an inversion result are improved.
Owner:CHINA RAILWAY DESIGN GRP CO LTD +1
Material demand scheme design method and system for equipment manufacturing industry
ActiveCN108596375AAvoid stayingImprove solution efficiencyForecastingCharacter and pattern recognitionData setMaterial type
The invention provides a material demand scheme design method for equipment manufacturing industry. The method comprises the steps of determining material demand time points according to a material demand data set and clustering a time point set: clustering the material demand time point set by utilizing an improved K_Means algorithm, and clustering the demand time points suitable to combine material demands for centralized purchase into a category; according to material demand information and material types, determining initial purchase schemes, and establishing optimization constraints of the purchase schemes; selecting the purchase schemes meeting the requirements to form a purchase scheme set; obtaining the fitness of the schemes; according to the fitness of the purchase schemes, optimizing the purchase scheme set by utilizing a GWO optimization algorithm; performing variation on the optimized purchase scheme set, checking the varied purchase schemes by utilizing the optimization constraints, calculating the fitness of new purchase schemes, and performing comparison and replacement with the fitness of the initial purchase schemes; and ending the process until satisfied purchaseschemes are obtained. The data support is provided for purchase of production resources, so that the production cost is reduced.
Owner:WUHAN UNIV OF TECH
Automobile driving characteristic evaluation and early warning method based on driving inclination
ActiveCN111627132AEasy to collectNarrow down the range of valuesRegistering/indicating working of vehiclesInference methodsEvaluation resultOriginal data
The invention discloses an automobile driving characteristic evaluation and early warning method based on driving inclination, which belongs to the technical field of automobile intelligent interaction. The invention aims at collecting real-time operation data of an automobile as original data for evaluating automobile driving characteristics, extracting the original data according to scenes and exerting the characteristic advantage that the driving inclination evaluates specific scenes in real time. The data complexity can be reduced by using a time sequence dimension reduction algorithm, andmeanwhile, time sequence characteristics implicit in the data are reserved; operation fragments are counted to obtain a high-frequency operation fragment database, and detailed driving characteristicbehavior description can be carried out; an HMM model is used for inclination identification, and an identification result has high credibility; by further calculating the camber value, the operationcharacteristics of all parties of a driving game can be compared; early warning information is obtained through quantitative and qualitative evaluation results, and the content is convenient to compare; the data are continuously updated along with the operation of the automobile, the real-time performance of the evaluation result and the early warning information is ensured, and the practicability is very high.
Owner:JILIN UNIV
Memory erasing method and device
ActiveCN109872759AEasy programmingConvenience to workRead-only memoriesEnergy efficient computingMemory cellSoftware engineering
The embodiment of the invention discloses a memory erasing method and device. The memory erasing method comprises the following steps: carrying out erasing operation on memory cells arranged in an erasing area; performing a first over-erase verification operation on the storage unit for increasing the threshold voltage of the storage unit to be greater than a first set threshold; sequentially performing a second over-erase verification operation on the storage unit, wherein the second over-erase verification operation is used for increasing the threshold voltage to be greater than a second setthreshold; when a second read verification operation in the second over-erase verification operation is carried out, applyintg negative voltage to all unselected word lines in the storage block wherethe erase area is located, applying zero voltage after a set condition is met,wherein the unselected word lines are word lines which are not electrically connected with the control end of the storageunit which currently carries out the second over-erase verification operation. According to the technical scheme provided by the embodiment of the invention, the problems of electric leakage of a non-erased area and increase of the time of over-erase verification operation due to aging and decline of the memory can be solved.
Owner:GIGADEVICE SEMICON (BEIJING) INC
Efficient and accurate phosphorus removal system for slowing down membrane blockage and phase membrane corrosion
PendingCN112456738ARefined operation managementReduce cloggingWater treatment parameter controlWater/sewage treatment by irradiationO-Phosphoric AcidPhosphate
The invention discloses an efficient and accurate phosphorus removal system for slowing down membrane blockage and phase membrane corrosion. The efficient and accurate phosphorus removal system comprises an online monitoring module, a PLC control module, a model calculation module and an automatic dosing module. The PLC control module adopts a feedforward superposition feedback control strategy, takes orthophosphate concentration of a water outlet of the A2O biological pool and total inflow as feedforward control signals, determines an accurate phosphorus removal agent amount required by phosphorus removal, the orthophosphate concentration of the water outlet of the MBR membrane pool is used as a feedback control signal for checking and valuing the adding amount of the phosphorus removal agent, and the PLC control module transmits a dosing quantity signal to the automatic dosing module to perform frequency conversion control dosing, so that feedback control is realized to adjust the dosing quantity. According to the phosphorus removal system, the dosage of chemicals can be reduced, it is guaranteed that the total phosphorus (TP) of effluent of a sewage plant reaches the standard, membrane pollution and phase membrane corrosion, caused by iron ions in the phosphorus removal agent, of an MBR membrane are effectively relieved, and refined operation management of the sewage plant is achieved.
Owner:CHINA CONSTR THIRD BUREAU GREEN IND INVESTMENT CO LTD
Video data background tracking and subtraction with multiple layers of stationary foreground and background regions
InactiveUS10438072B2Accurate identificationHigh sensitivityImage enhancementImage analysisComputer graphics (images)Video sequence
Owner:ECHELON CORP
Apparatus and method for providing density of pt-rs
ActiveUS20210367734A1Reduce signaling overheadSignal degradationTransmission path divisionSignal allocationReal-time computingBase station
Provided is a method and apparatus for providing information related to density of a PT-RS in a wireless communication system. The operation method of a base station may include: configuring a phase tracking reference signal (PT-RS) corresponding to a terminal; and transmitting time and frequency density information of the PT-RS to the terminal, and the time and frequency density information of the PT-RS is configured based on threshold values of time and frequency density of the PT-RS which are compressed based on at least one of a uniform sampling grid scheme, a non-uniform sampling grid scheme, a combinational indexing scheme, or a scheme of imposing a limit on a threshold value. Other embodiments may be possible.
Owner:SAMSUNG ELECTRONICS CO LTD
Incoming direction estimation apparatus
InactiveUS20080007455A1Reduce range of valueWide field of viewPosition fixationIndividually energised antenna arraysCarrier signalRadar
An incoming direction estimation apparatus estimates an incoming direction of a radar wave using three or more sensors or antennas simultaneously. An arithmetic expression for estimating an incoming direction of a radar wave is configured as sin−1((½πa)*tan−1b). The “a” is d / λ determined by an antenna interval and by a wavelength λ of a carrier, or such, carrying the radar wave. A simultaneous use of three antennas makes it possible to set the a as a value depending on a value d0=a0λ based on the interval between first antennas and value d1=a1λ based on the interval between second antennas. Therefore, if a wide field of vision of an incoming direction is needed, it is only necessary to adjust (d1−d0) / λ=(a1−a0), in place of the absolute interval of antennas a=d / λ, thereby making it possible to lessen a limitation on the design of antennas and set a field of vision of the incoming direction appropriately.
Owner:FUJITSU LTD
Rapid optimization method of cycloidal gear tooth profile modification coefficient
ActiveCN111125898AImprove optimization speedNarrow down the range of valuesGeometric CADDesign optimisation/simulationComputational physicsEngineering
The invention discloses a rapid optimization method of a cycloidal gear tooth profile modification coefficient. The method comprises the steps that firstly, by means of the characteristics that the initial meshing clearance of a cycloidal gear and a pin gear is a minimum value at the position and is a minimum value in the interval of [0, pi], derivation operation is conducted, the value range of tooth profile modification coefficients delta rp and delta rrp is narrowed, and the calculated amount for screening the optimal tooth profile modification coefficients delta rp and delta rrp is reduced; secondly, in the optimization process of the tooth profile modification coefficient, when the step of calculating the stress Fmax of the tooth with the maximum stress in the teeth transmitting the force at the same time is carried out, a warning parameter warn is introduced to represent the convergence state of the Fmax, according to the counting condition of the warning parameter warn, the non-solution condition that the Fmax cannot converge is rapidly eliminated in the optimization process, and the optimization speed is further increased.
Owner:ZHEJIANG LAB
Red envelope amount allocation method and device, computer device and readable storage medium
PendingCN109272301AShorten the amount differenceNarrow down the range of valuesPayment circuitsComputer deviceLower limit
The embodiment of the invention provides a red envelope amount allocation method and device, a computer device and a readable storage medium, which can reduce the difference between the luck red envelopes. The embodiment of the invention obtains the amount of red envelopes to be distributed and the number n of red envelopes to be distributed; Determining a first candidate value of the maximum amount distributable this time according to the amount of red envelopes to be distributed, the number n of red envelopes to be distributed and the preset minimum amount of single red envelopes, and determining a second candidate value of the minimum amount distributable this time according to the amount of red envelopes to be distributed, the number n of red envelopes to be distributed and the presetmaximum amount of single red envelopes; Thereby, determining the smaller of the first candidate value and the preset single red packet maximum amount as the upper limit value of the allocatable amount, and determining the larger of the second candidate value and the preset single red packet minimum amount as the lower limit value of the allocatable amount; and any value between the lower limit value and the upper limit value is determined as the target amount of the red envelope.
Owner:CHINA PING AN PROPERTY INSURANCE CO LTD
Roughness partition calibration method and system based on posteriori distribution
PendingCN111859820ANarrow down the range of valuesHigh precisionDesign optimisation/simulationComputational physicsStatistical physics
The invention discloses a roughness partition calibration method and system based on posteriori distribution. The method comprises the steps that 1, dividing a target water body into k subareas; 2, determining the roughness value range of the target water body; 3, equally dividing the determined roughness value range into n intervals, and simultaneously extracting a plurality of roughness combinations in each sub-region; 4, selecting a target likelihood function to perform normalization calculation to obtain likelihood values of the sub-regions; 5, calculating the probability of the likelihoodvalue of each sub-region on each sub-interval, and obtaining the roughness posteriori distribution of each sub-region; 6, repeating the steps 3 to 5 for iteration once on the premise that the roughness posteriori distribution of each sub-region replaces the roughness uniform distribution of each sub-region; and 7, obtaining the maximum likelihood value probability of each subarea and the optimalroughness value of each subarea corresponding to the maximum likelihood value probability. According to the invention, the roughness partition calibration precision can be improved.
Owner:HOHAI UNIV
Multi-unmanned aerial vehicle gas leakage source positioning method based on improved seagull algorithm
InactiveCN114279636ARapid positioningEffective positioningBiological modelsFluid-tightness measurement using fluid/vacuumMobile robotReal-time computing
The invention creatively combines an improved seagull algorithm with an unmanned aerial vehicle group, and discloses a multi-unmanned aerial vehicle gas leakage source positioning method based on the improved seagull algorithm. Compared with a traditional traceability method depending on a fixed monitoring station or a ground mobile robot, the method takes the unmanned aerial vehicle cluster as a traceability platform of gas leakage, and has the advantages of low cost, wide search range, high flexibility, high traceability efficiency and the like. Compared with a standard seagull algorithm, the gas leakage source positioning method based on the improved seagull algorithm has the following innovativeness: the value range of a balance operator B is reduced, the step length is greatly reduced, and the global search capability is greatly improved; the spiral radius r is set to be a fixed value, it is guaranteed that no disordered moving direction occurs in the iteration process of an individual, and the stability of the algorithm is improved; the foraging behavior is introduced, so that other individuals can explore themselves while following the optimal individual, and local optimum is avoided.
Owner:CHINA JILIANG UNIV
Method for optimizing control parameters of grid-connected photovoltaic inverter
InactiveCN110233503AImprove vibrationImprove small disturbance stabilitySingle network parallel feeding arrangementsPower oscillations reduction/preventionDamping ratioAnalytical control
The invention discloses a method for optimizing control parameters of a grid-connected photovoltaic inverter. The method comprises the steps of: establishing a small signal analysis model of a photovoltaic power generation system, and preliminarily determining main factors influencing system oscillation by using characteristic value analysis and sensitivity analysis; performing multi-time scale order reduction for the small signal model, analyzing the influence of the controller parameters on the oscillation mode based on the order reduction model, and determining the main controller parameters to be optimized and the value range thereof; and finally, establishing an objective function which comprehensively considers the stability, the damping ratio and the oscillation mode of the system,and optimizing parameters by adopting a genetic algorithm. According to the method, the parameters of the controller to be optimized can be reduced, the value range of the parameters is narrowed, theoscillation problem of the photovoltaic power generation system can be effectively improved, and the workload of parameter design is simplified.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Video data background tracking and subtraction with multiple layers of stationary foreground and regions
ActiveUS20180247136A1Accurate identificationHigh sensitivityImage enhancementImage analysisPattern recognitionVideo sequence
Transient connected regions are tracked in a video sequence, marking them as foreground layer or background layer when the transient regions become stable. A stack of background / foreground Gaussian mixer models is maintained for each pixel. The decision to mark a stable region as background layer or a new or existing foreground layer is done by matching the region with each model in the model stack. If the new region matches an existing model, then the layers above the matched layers are purged, or else the new region is pushed as a new foreground layer with a new model.
Owner:ECHELON CORP
Method for determining maximum single-shot explosive quantity during blasting
ActiveCN113051717ANarrow down the range of valuesImprove selection accuracyDesign optimisation/simulationComputational theoretical chemistryClassical mechanicsExplosives engineering
The invention discloses a method for determining the maximum single-shot explosive quantity during blasting, and belongs to the technical field of blasting engineering. The method comprises the steps: manufacturing a cemented filling body test piece according to the mine filling condition, and obtaining the maximum dynamic compressive strength sigma<emax> of the graded tailing cemented filling body in the mass point elastic deformation stage and the maximum dynamic compressive strength sigma<pmax> when the mass points of the graded tailing cemented filling body are completely damaged through an SHPB impact test; based on the combination of a one-dimensional stress wave propagation formula and a Sadov's formula of field monitoring regression, determining a stable area and a damaged area of the filling bodies with different strengths, and determining the maximum-section simultaneous explosive quantity corresponding to the damaged area.
Owner:KUNMING UNIV OF SCI & TECH
A Method for Selecting Sample Points of Gas Turbine Dynamic Working Condition Database
ActiveCN106840685BNarrow down the range of valuesSmall scaleInternal-combustion engine testingEngineeringHigh pressure
Owner:INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI +1
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