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143 results about "Vector distribution" patented technology
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Illuminator
InactiveUS20050213320A1More LEDUneven illuminationMechanical apparatusPoint-like light sourceVector distributionLight-emitting diode
The present invention of illuminator pertains to converting spot light source, especially light-emitting-diode, into planar light source with some kind of intensity distribution mode, including a spot light source and a reflector, characterized in that spot light source is located at lateral and nook position, and the reflector can be designed elastically according to requirement of mode of reflected light vector distribution in space and mode of reflected light intensity distribution on illuminated surface. Spot light sources of the present invention include light-emitting-diode LCD. The modes of reflected light include space distribution mode in which light vectors are more orientated or nearly parallel and intensity distribution mode, of reflected light on illuminated surface, in which intensity is nearly even on illuminated surface; Both types of modes can co-exist in a illuminator. The illuminator of the present invention can be applied to display of mobile phone, personal digital assistant PDA, and notebook computer, backlight module, and general illuminating usage.
Owner:ACE T
Vector distribution control method for torque of distributed-driven electric automobile
ActiveCN109747434AInhibition of difficult steering problemsImprove driving stabilitySpeed controllerElectric energy managementBrake torqueStable state
The invention discloses a vector distribution control method for torque of a distributed-driven electric automobile. Through the relation between vehicle driving state stability and the expected yaw velocity under a vehicle dynamical model, an ideal motion state of a vehicle under generalized additional yawing moment is worked out, and control stability of a system is judged and analyzed through the expected yaw velocity so as to determine whether yawing moment control is required or not; a tyre longitudinal slip rate is set as a specific value in a stable state, and driving torque is precisely distributed under the condition that a coefficient of road adhesion is met. Through reasonable distribution of driving or braking torque of front and back axles, the response speed to the expected yaw velocity can be remarkably increased, so that the vehicle has an ideal motion state when passing a curve, the problem of difficult steering of the vehicle when acceleration is not enough is effectively restrained, curve passing efficiency is improved, vehicle driving stability and smoothness are improved, control burden of the driver is remarkably reduced, and driving safety is improved.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO
Method for controlling neutral point voltage balance of three level converter
The invention, which belongs to the power converter control field of the driving motor, relates to a method for controlling neutral point voltage balance of a three level converter, wherein the method is based on a voltage space vector pulse width modulation technology and is used for controlling a neutral point clamped three level inverter. The method comprises the following steps that: step one, an action time distribution factor of a redundant small vector is obtained; step two, an area where control on a neutral point potential balance can be realized by a nearest three vector (NTV) method is obtained; step three, an NTV action area in a mixed voltage space vector pulse width modulation method is obtained; step four, a switching condition of the mixed voltage space vector pulse width modulation method is designed; and step five, the mixed voltage space vector pulse width modulation method with a proportion of pm is realized. According to the invention, a redundant small vector distribution factor is employed to design a switching condition of a mixed voltage space vector pulse width modulation strategy; therefore, an essence of a space vector modulation method is embodied; themethod can be used flexibly and used variables are less, so that it is beneficial for analysis and development application.
Owner:TIANJIN UNIV
Method for modulating space vectors of double inverters
InactiveCN104506070AReject common mode voltageIncrease profitElectronic commutation motor controlAC motor controlVoltage vectorTwo-vector
The invention discloses a method for modulating space vectors of double inverters, and belongs to the field of inverter control. The method is used for solving the problem that in the prior art, when basic space voltage vectors which do not generate common-mode voltage are selected to modulate voltage, the utilization of direct-current bus voltage is low. The method comprises the steps that a space voltage vector plane is divided into six sectors, a reference voltage vector is divided into two vectors, one vector is equivalent to the operation that one of the double inverters is clamped in a specific switching state, and the other vector is modulated by the other inverter in six sub-sectors of the inverter to be achieved; modulation is conducted within the maximum voltage range, an equivalent zero vector distribution factor is introduced when the vectors are synthesized, the common-mode voltage generated in the process of synthesis of the basic voltage vectors is counteracted with common-mode voltage generated by a zero vector, and common-mode voltage of the double inverters is restrained.
Owner:HARBIN INST OF TECH
Distributed driving electric automobile torque vector control method based on double-layer control
ActiveCN109606133AImprove driving stabilityEasy rideSpeed controllerElectric energy managementVehicle dynamicsDrive wheel
The invention discloses a distributed driving electric automobile torque vector control method based on double-layer control. The control method comprises the following steps: establishing a vehicle dynamic model, and calculating a tire slip rate by utilizing a Dugoff tire model; establishing a torque distribution controller based on the vehicle dynamic model and the Dugoff tire model, wherein thetorque distribution controller comprises an upper controller and a lower controller; calculating the current drive torque of each driving wheel of the vehicle by the upper controller according to body yawing angular velocity; calculating a compensating torque needed for remaining an ideal slip rate of each driving wheel by the lower controller according to the ideal slip rate of each driving wheel serving as a control objective, and further performing compensation distribution on the driving torque, so that an actual torque is output to the driving wheel, and torque vector control is completed. According to the control method disclosed by the invention, the automobile torque can be effectively subjected to vector distribution, the vehicle driving stability and smoothness are improved, theoperating burden of the driver is obviously decreased, and the driving safety is improved.
Owner:ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Gray scale and geometric information combined medical image registration method
The invention provides a gray scale and geometric information combined medical image registration method and relates to the technical field of medical image processing. Grey scale values are the values on all pixels / voxels in digital medical images and distributed as image gray scale information; and normal vectors represent unit vectors of geometric normal of all points, represent the gray scale information of the medical images by adopting the grey scale value distribution, represent the geometric information of the medical images by adopting the image normal vector distribution, and finally measure the similarity between the gray scale and the geometric information quantity by adopting mutual information. According to the invention, the conventional mutual information method and gradient solution method are adopted, and the obtained mutual information values are added together, so that easy implementation can be realized in engineering application; the advantages of both the gray scale and the geometric information are fully utilized to ensure that less local extreme points fall in the registering process, and better robustness is achieved; and tests show that the method provided by the invention can acquire higher precision.
Owner:SUZHOU DIKAIER MEDICAL TECH
Off-axis aspheric lens detection method based on fringe reflection
An off-axis aspheric lens detection method based on fringe reflection includes: firstly, building a world coordinate system around the center of an off-axis aspheric lens and acquiring the relation among the world coordinate system, a display coordinate system and a camera coordinate system; secondly, utilizing the camera to take pictures of projections, reflected from a measured lens, of sine periodic fringe patterns displayed on a display screen during measuring; and thirdly, obtaining phase distribution according to the phase shift technology and the phase unwrapping technology, obtaining normal vector distribution of the measured off-axis aspheric lens according to the relation among the coordinates; and finally, rebuilding surface form height information of the measured off-axis aspheric lens in an integral manner. In addition, a measuring system utilizing the off-axis aspheric lens detection method based on fringe reflection consists of the measured lens, the display screen and a CCD (charged coupled device) camera unit.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Method for optically measuring shear stress of boundary layers of flow fields
ActiveCN106768822AImprove color recognitionImprove test accuracyAerodynamic testingFluid pressure measurement by optical meansOptical measurementsMeasurement precision
The invention discloses a method for optically measuring shear stress of boundary layers of flow fields, and relates to the technical field of wind tunnel tests. The method includes main steps of (1), anodizing and blackening wind tunnel test models; (2), smearing liquid crystal coatings; (3), acquiring relation curves of colors of the liquid crystal coatings and shear force; (4), mounting 6 test cameras; (5), simultaneously photographing the liquid crystal coatings by the 6 test cameras to obtain images of the liquid crystal coatings; (6), removing position difference of the images photographed by the different test cameras; (7), carrying out distortion removal processing; (8), correcting identical colors of the images photographed by the various cameras; (9), acquiring model surface shear stress vector distribution results. The method has the advantages that the obtained images are clear and visual, and the method is high in measurement accuracy and sensitivity and can be used for displaying the flow fields of wind tunnels, diagnosing transition and quantitatively measuring model surface friction drag.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS
Adaptive federal filtering method of vector-form information distribution coefficients
InactiveCN102353378AImprove stabilityGood precisionInstruments for comonautical navigationSynthetic aperture radarCovariance
The invention discloses an adaptive federal filtering method of vector-form information distribution coefficients. The method comprises the following steps of: firstly, on the basis of analysis of the working environments and working characteristics of three navigation sensors such as a global positioning system (GPS), a celestial navigation system (CNS) and a synthetic aperture radar (SAR), establishing a linearization measurement equation of an inertia navigation system and each navigation sensor under a geographical system, and constructing filtering sub-systems; secondly, respectively performing Kalman filtering on the filtering sub-systems, designing a scheme for calculating vector information distribution coefficients by combining characteristic values of estimation error covariancematrixes of the sub-systems and singular values of observable matrixes of the sub-systems, and designing a new information distribution equation for solving the problem of asymmetry of covariance matrixes caused by vector distribution coefficients; and finally, performing optimal estimation on the error state of inertial navigation by using a federal filtering method. The method is high in navigation accuracy; and by adoption of the method, a multi-sensor combination navigation system can fully estimate the error state quantity of the inertia navigation system in a dynamic environment.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Intelligent vehicle speed prompting driving system based on mobile phone
InactiveCN103680177AReasonable speed adviceLow costRoad vehicles traffic controlWireless commuication servicesVector distributionTime table
The invention discloses an intelligent vehicle speed prompting driving system based on a mobile phone. The intelligent vehicle speed prompting driving system comprises the mobile phone on a vehicle and a server. According to the work processes of the mobile phone and the server, the GPS and accelerated speed information of the mobile phone on the vehicle are collected in a crowdsourcing mode, and data are transmitted to the server through a wireless network at certain time; the positions of road junctions with traffic lights are determined through an accelerated speed vector distribution map and a GPS path; a road is represented by using a secondary B spline; the accelerated speed events of each road junction are collected in a crowdsourcing mode, and the time tables of the traffic lights of the road junctions are deduced; the optimal speed is prompted for the vehicle according to a generated map and the time tables of the traffic lights of the front road junctions, and the situation that the vehicle meets a red light at the road junctions and stops is avoided as far as possible. On one hand, the map is generated though a new method, and on the other hand, the deduction of the time tables of the traffic lights at the complex road junctions is solved through a road junction structure.
Owner:SHANGHAI JIAO TONG UNIV
Texture force touch sensing method based on single image fractional order processing
InactiveCN104050683AEnhanced Edge ProfilesEnhanced detail texturesInput/output for user-computer interactionImage enhancementDamping factorPattern recognition
The invention discloses a texture force touch sensing method based on single image fractional order processing. The method includes the steps that a fractional differential algorithm is utilized, the order gamma of the fractional differential algorithm is adjusted dynamically, an enhanced texture image is obtained, original image texture information is extracted from the enhanced texture image, and multi-scale analysis of the detail texture and the edge contour of different rates of gray level changes is achieved from the point of image airspace gray level change features; force touch rendering is carried out on the virtual surface texture, and tangential force frictional damping coefficients of a force touch sensing model are controlled on the basis of gradient vector distribution of the enhanced texture image; obtained resultant force is calculated and fed back to an operator through a hand controller. By the utilization of sensibility of fractional differential to detail information, the sense of reality of texture force touch sensing is enhanced by manually selecting orders, extracting texture information in a two-dimensional image signal from different scales and converting the texture information into frictional damping control.
Owner:SOUTHEAST UNIV
Adaptive search range method for motion estimation and disparity estimation
ActiveUS20130114689A1Value of counter value is increasedColor television with pulse code modulationColor television with bandwidth reductionVector distributionSelf adaptive
An adaptive search range method for motion / disparity estimation is provided in multi-view video coding (MVC) technology. The method uses a initial search range as a first search range, perform an estimation flow for first blocks in a first frame to obtain vector distribution, and obtain at least a first candidate search range in accordance with the vector distribution. The first candidate search range is selected as a second search range to perform estimation flow for second blocks in a second frame, and an estimation vector according to the estimation flow is obtained and provided as video coding.
Owner:IND TECH RES INST
Method for automatically cutting granular object in digital image
InactiveCN102324092AImprove accuracySmall amount of calculationImage enhancementMicroscopic imageImaging analysis
The invention discloses a method for automatically cutting a granular object in a digital image, belonging to the technical field of digital image processing. The method comprises the following steps of: firstly, separating an object from a background by applying an automatic threshold method by aiming at characteristics such as gray level, structural distribution, geometry and the like of the granular object in the digital image, particularly a microscopic image; then, calculating a gradient vector field of the object, and searching a key point in the gradient vector field, wherein the idealkey point has corresponding gradient vector distribution in eight neighborhoods, the gradient value of the key point is zero, and the acquired key point is used as the center of each granular object;next, defining a new effective energy function based on the gray level and a space position so as to calculate a direction gradient to replace the traditional gray level gradient; and finally, searching the boundary of the granular object by applying an active contour model. By using the method, the aggregated granular object can be accurately and effectively cut, particularly, a great number of adhered or overlapped micro-grains exist in a biomedical microscopic image, and therefore, help is provided for the image analysis and identification.
Owner:SOUTH CHINA UNIV OF TECH
Flow field characteristic experiment device of combustion chamber of hydrogen-burning gas turbine
InactiveCN103017999AEvenly distributedReduced commissioning timeAerodynamic testingHydrogenCombustion chamber
The invention discloses a flow field characteristic experiment device of a combustion chamber of a hydrogen-burning gas turbine. The flow field characteristic experiment device comprises three pairs of bluff body arrangement combustion chamber experiment pieces, a particle image velocimetry (PIV) test platform frame, a PIV test system and a pressure difference and environment temperature test system. The three pairs of bluff body arrangement combustion chamber experiment pieces comprise a front lateral plate, a front bluff body, a back bluff body, an affiliation mechanism of the back bluff body, a front top plate and a back top plate. A tracer particle injection pipe jack is arranged on the front lateral plate, an inlet speed probe jack is arranged on the front top plate, and an outlet speed probe jack is arranged on the back top plate. A tracer particle generator is connected with the tracer particle injection pipe jack on the front lateral plate. The device adopts the PIV test technology, selects reasonable combustion chamber position, reasonably mingles tracer particles into a main gas flow under the effects of the tracer particle generator and a tracer particle injection pipe, enables tracking particles in the test area to be evenly distributed and conducts visualization experiment of cold state flowing speed vector distribution of three pairs of bluff arrangement combustion chambers.
Owner:DALIAN MARITIME UNIVERSITY
Method of obtaining a sliding distance distribution of a dresser on a polishing member, method of obtaining a sliding vector distribution of a dresser on a polishing member, and polishing apparatus
ActiveUS9108292B2Ensure correct executionAbrasive surface conditioning devicesContact timeVector distribution
The method includes: calculating an increment of a sliding distance of a dresser by multiplying a relative speed between the dresser and a polishing member by a contact time between them; correcting the increment of the sliding distance by multiplying the calculated increment of the sliding distance by at least one correction coefficient; calculating the sliding distance by repeatedly adding the corrected increment of the sliding distance to the sliding distance according to elapse of time; and producing the sliding-distance distribution of the dresser from the obtained sliding distance and a position of a sliding-distance calculation point. The at least one correction coefficient includes an unevenness correction coefficient provided for the sliding-distance calculation point. The unevenness correction coefficient is a correction coefficient that allows a profile of the polishing member to reflect a difference between an amount of scraped material of the polishing member in its raised portion and an amount of scraped material of the polishing member in its recess portion.
Owner:EBARA CORP
Light-condensing head and storage apparatus
InactiveUS20070109919A1Efficient productionCombination recordingRecord information storageVector distributionElectric field
A light-condensing head has a light source unit, a light-condensing element that condenses the light emitted from the light source unit, and an electrically conductive scatterer that, when irradiated with light, produces localized plasmon at the light condensation position of the light from the light-condensing element. The light emitted from the light source unit contains, at least in part thereof, polarized waves that constitute a rotation-symmetric radiating electric field vector distribution in which the electric field vectors have equal magnitudes at equal distances from the center of rotation symmetry. The electrically conductive scatterer has, in the light-receiving portion thereof that receives the light from the light-condensing element, rotation symmetry of order three or more.
Owner:KONICA MINOLTA INC
An antagonistic cross-media retrieval method based on bilingual semantic space
ActiveCN109344266AStrong complementarityAchieve balanceMetadata multimedia retrievalSpecial data processing applicationsSemantic gapVector distribution
The invention discloses an antagonistic cross-media retrieval method based on bilingual meaning space, which relates to the technical fields of pattern recognition, natural language processing, multimedia retrieval and the like. Including: feature generation process, bilingual semantic space construction process and antagonistic semantic space optimization process. The invention realizes that theoriginal image and the text information are kept to the maximum extent while the semantic gap is eliminated by establishing an isomorphic bilingual meaning space, namely a text subspace and an image subspace. And through antagonism training to optimize the distribution of isomorphic subspace data, mining the rich semantic information in multimedia data, and fitting the vector distribution of different modes in the semantic space under the condition that the categories remain unchanged and the modes can be distinguished. The method of the invention can effectively eliminate the heterogeneity ofdifferent modal information, realize effective cross-media retrieval, and has wide market demand and application prospect in the fields of picture and text retrieval, pattern recognition and the like.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL
Ultrasonic image processing method and device, and ultrasonic image processing program
An ultrasonic image processing method and device, and an ultrasonic image processing program which can correspond to analytical methods different depending on a region or the purpose of a diagnosis or treatment. The ultrasonic image processing method comprises an image data creation step which stores a detection result obtained by irradiating a subject with ultrasonic waves by an irradiating section and detecting an ultrasonic signal from the subject by a detecting section and creates at least two-frame image data different in detection timing on the basis of the stored detection result, a motion vector distribution image creation step which creates a motion vector distribution image on the basis of a predetermined motion vector analysis through the use of a plurality frames of the image data, and a conversion step which converts a vector distribution image to a scalar distribution image on the basis of a plurality of established regions of interest (ROI).
Owner:FUJIFILM HEALTHCARE CORP
Cross-media information analysis and retrieval method
InactiveCN102693321AAlleviate the problem of excessive space complexitySolve the problem of feature heterogeneitySpecial data processing applicationsFeature vectorInformation analysis
The invention provides a cross-media information analysis and retrieval method, which comprises the following steps of: performing semantic integration processing on multimode information; performing expansion according to a probability latent semantic analysis model to obtain a multilayer continuous probability latent semantic analysis model for processing a continuous feature vector; learning the multilayer-continuous probability latent semantic analysis model by adopting an asymmetric learning method, and calculating the visual feature vector distribution of an image, the visual feature vector distribution of an audio and topic probability distribution; submitting a training set and a tested media object which serves as a retrieval example by a user, and calculating intra-mode and inter-mode initial similarity values of the image and the audio in the retrieval sample; constructing a propagation model, and updating the intra-mode and inter-mode similarity values according to the propagation model; and performing secondary retrieval according to the updated similarity values.
Owner:CHANGZHOU HIGH TECH RES INST OF NANJING UNIV
Method for building and digitally expressing grassland vegetation subtypes
ActiveCN104217103AImprove investigation efficiencyEasy to distinguishSpecial data processing applicationsVegetationVector distribution
The invention relates to a method for building and digitally expressing grassland vegetation subtypes. The method comprises the following steps of (1) marking a searched area, and searching vegetation of acquired searching sample points; (2) calculating the plant species dominance degree of vegetation of each searching sample point; (3) according to the plant type and the plant species dominance degree of each searching sample point, judging whether the searching sample points have the same vegetation subtype or not, and when the vegetation subtype is changed, actually measuring the boundary coordinates of different vegetation subtypes to obtain the vector base map of each vegetation subtype in the searched area; (4) building an attribute data table of each vegetation subtype, and drawing the digital vector distribution diagram of each vegetation subtype by adjusting and overlapping transparency of diagram layers; (5) placing the obtained digital vector distribution diagrams of the vegetation subtypes together, and finally generating the digital vector distribution diagram which shows the vegetation subtype distribution in the searched area and the formation and distribution of dominant plants in the vegetation subtypes. The method is widely applied to practical applications, such as research on the evolution of grassland vegetation, agricultural production, grassland vegetation resource monitoring.
Owner:INST OF PLANT PROTECTION CHINESE ACAD OF AGRI SCI
Gradient vector analysis-based retinal image micro-aneurysm automatic detection and identification method
InactiveCN106780465AEasy to detectEasy to identifyImage enhancementImage analysisForeign matterPattern recognition
The invention discloses a gradient vector analysis-based retinal image micro-aneurysm automatic detection and identification method. The method comprises the following steps of 1, detecting a candidate micro-aneurysm: firstly extracting the micro-aneurysm mainly by three steps of removing blood vessels, locating the candidate micro-aneurysm and segmenting the candidate micro-aneurysm; 2, extracting features of the candidate micro-aneurysm; and 3, identifying the micro-aneurysm. A new gradient vector analysis-based retinal image micro-aneurysm automatic detection and identification method is proposed in combination with a sample unbalanced classifier through analyzing gradient vector distribution situations of different dark targets in a fundus retinal image. The method also can be effectively applied to the detection of a tiny foreign matter object in an infusion image, the detection of a tiny infrared target in a remote sensing image and the detection of a tiny defective target in a workpiece surface image.
Owner:HARBIN INST OF TECH
Method for visually testing internal molding shrinkage characteristic of high polymer material
InactiveCN102928339ARaise the level of researchMaterial analysis by optical meansUsing optical meansPolymer scienceShell molding
The invention discloses a method for visually testing the internal molding shrinkage characteristic of a high polymer material, belonging to the field of high polymer molding. Through the change of the positions (before and after a product is shrunk) of characteristic points such as active carbon particles, hollow glass beeds and toners which are added into the product, with a static visualization means, the internal shrinkage distribution of the product is calculated by using specific image processing software in a coordinate mode, and the orientation distribution of the internal shrinkage of the product is systematically reflected in a mode that two-dimensional curves, contour line cloud charts and vector distribution diagrams are combined, so that the change rule of the internal shrinkage of the product is found, the molding shrinkage mechanism is discussed, and thereby the development of a precise molding technique of the high polymer material is promoted.
Owner:DALIAN UNIV OF TECH
Method for calculating local specific energy absorption rate (SAR) in nuclear magnetic resonance
ActiveUS20120262174A1Short timeMeasurements using NMR imaging systemsElectric/magnetic detectionClinical settingsEnergy absorption
A method for calculating a local specific energy absorption rate (SAR) on basis of an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan. The magnetic field mapping method based on a magnetic resonance scan can be a Bi mapping method. The invention also relates to a magnetic resonance system by means of which SAR calculation can be done in a relatively short period of time. The invention also relates to a computer program comprising instructions for calculating a local specific energy absorption rate (SAR) according to the above mentioned method. The SAR calculation used in the above mentioned method, system and program is done in the relatively short period of time and as such is practicable in a clinical setting.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Design analysis method for gas turbine gas inlet device
The invention relates to a design analysis method for a gas turbine gas inlet device, which belongs to the technical field of gas turbines. The precise stimulating analysis is carried out on the working conditions of a local part and a section of a gas inlet device by adopting a computer stimulating technology. The method comprises the following steps of: (1) model establishment: firstly, primarily designing a two-dimensional viewgraph and carrying out ANSYS three-dimensional modeling on the part needing to be calculated and analysis under the condition of confirming the sizes of all parts of the two-dimensional viewgraph; carrying out finite element division of an analysis object according to the concrete technical requirement and precision requirement needing analysis and calculation of the analysis object so that a computer can analyze and calculate each unit by utilizing enough resources; and (2) loading analysis: A. strength and linear buckling analysis: containing stress distribution, displacement distribution and load factors in calculating results; B. flow field analysis: analyzing the static pressure, total pressure and speed flow line of a system and respectively obtaining a speed vector distribution picture, a static pressure cloud picture and a total pressure cloud picture of a typical section.
Owner:SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
Abnormal case identification method and device based on artificial intelligence, and computer equipment
PendingCN111145910AImprove recognition accuracyExpand the scope of recognitionMedical data miningFinanceDiseaseClinical pathway
The invention relates to big data, and provides an abnormal case identification method based on artificial intelligence which is applied to a platform server. The method comprises the steps: acquiringdiagnosis and treatment project data corresponding to the same disease, taking diagnosis and treatment time as a unit, and taking the diagnosis and treatment project data as words in a text to conduct text construction, wherein the constructed text comprises the diagnosis and treatment project data of different users of the same disease in the corresponding diagnosis and treatment time period; performing topic model construction on the text to obtain corresponding topic vector distribution, wherein each topic vector distribution is corresponding to one topic and comprises a plurality of wordidentifiers and corresponding word weights, and the topics have different user topic weights for different users; aligning the topic vector distribution corresponding to each text and performing clustering to obtain diagnosis and treatment item categories corresponding to each user at different time to form a diagnosis and treatment sequence corresponding to the user; and inputting the diagnosis and treatment sequence corresponding to each user at different diagnosis and treatment time into the process mining model to obtain a standard clinical path corresponding to the disease type so as to identify the abnormal case.
Owner:PING AN MEDICAL & HEALTHCARE MANAGEMENT CO LTD
Adaptive visual positioning method of heart blood flow vortex movement based on color doppler image information
ActiveCN104207803AWith symmetrical diffusionAdaptableBlood flow measurement devicesColor dopplerSonification
The invention discloses an adaptive visual positioning method of heart blood flow vortex movement based on color doppler image information. The method comprises the following steps of according to the distribution conditions of blue areas and red areas of a color doppler ultrasound heart blood flow image, determining the approximate area of the blood flow vortex movement; in the rough positioning area, determining the accurate boundary of the blood flow vortex movement area; in the accurate positioning area, obtaining a speed vector distribution chart of blood flow vortex movement; according to the speed vector distribution chart of blood flow vortex movement, obtaining a plane streamline chart of blood flow vortex movement; according to the plane streamline chart of blood flow vortex movement, judging the volume, shape and position information of blood flow vortex movement. The method has the advantages that the defect of objective selection of interested areas of the existing method is overcome, the precision of visual positioning of blood flow vortex movement of a heart flow filed is greatly improved, the solid foundation is laid for the accurate quantitative evaluation of blood flow vortex movement of the heart flow filed, and the accurate mechanical data support is also provided for the accurate evaluation of the heart mechanical function.
Owner:SICHUAN PROVINCIAL PEOPLES HOSPITAL
Method for calculating local specific energy absorption rate (SAR) in nuclear magnetic resonance
ActiveUS9229074B2Short timeMeasurements using NMR imaging systemsElectric/magnetic detectionElectricitySolid-state nuclear magnetic resonance
A method and system for calculating a local specific energy absorption rate (SAR) is based on an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan, such as a B1 mapping method.
Owner:KONINK PHILIPS ELECTRONICS NV
Ultraviolet light non-line of sight (NLOS) communication directional access method based on angular sensing
InactiveCN102324973AImprove transmission distanceReduce the number of hopsFree-space transmissionElevation angleAccess method
The invention discloses an ultraviolet light non-line of sight (NLOS) communication directional access method based on angular sensing. The method comprises the steps of: firstly, setting the value of a receiving elevation angle to be 90 degrees, and calculating the coverage area of ultraviolet light NLOS communication according to a divergence angle and a launching elevation angle of an emission node; then designing a node structure of the ultraviolet light NLOS communication, and establishing an interface elevation angle neighbor list; then updating a directional network vector distribution table; then judging whether a channel is idle or not; performing channel reservation; and finally, sending and receiving data to complete the direction access of the ultraviolet light NLOS communication. According to the method disclosed by the invention, an optimal launching elevation angle and an optimal interface number can be selected by an ultraviolet light communication node during channel access according to the interface elevation angle neighbor list, for data transmission. Compared with an access algorithm of a static appointed transmission elevation angle, the method disclosed by the invention has the advantages of reducing the probability in interference node generation, increasing communication transmission distance, reducing a hop count needed by communication, and providing relevant guidance for the node structural design with adoption of an ultraviolet light NLOS communication manner.
Owner:江苏崛起通讯科技有限公司
Scientific and technological paper clustering analysis method based on variational diagram auto-encoder and K-Means
PendingCN112084328AImprove accuracyReduce computing costCharacter and pattern recognitionNeural architecturesAlgorithmDimensionality reduction
The invention discloses a scientific and technological paper clustering analysis method based on variational diagram auto-encoder and K-Means, which comprises the following steps of: constructing a citation network G=(V, E, F) by utilizing existing scientific and technological paper data, and constructing a variational diagram auto-encoder consisting of an encoder and a decoder according to an adjacent matrix A of a citation relationship between papers and a characteristic matrix F of paper keyword attributes, taking minimization of distance measurement between a reconstructed adjacency matrixand an original adjacency matrix A and divergence of node representation vector distribution and normal distribution as targets, training in an unsupervised mode to obtain multi-dimensional Gaussiandistribution, and sampling from the distribution to obtain a low-dimensional embedded vector z of a node; and then clustering the low-dimensional embedded vector z by using the K-Means algorithm to obtain a division result of the science and technology paper, and performing two-dimensional visual display after dimension reduction by using a tSNE algorithm. According to the method, the accuracy ofscientific and technological paper clustering analysis is improved, and the calculation cost of analysis is reduced.
Owner:ZHEJIANG UNIV OF TECH
Radar information processing method used for restraining false-alarm objects of rotary blades of wind driven generators
ActiveCN104199002AThe probability of detection has no effectReduce false alarm rateWave based measurement systemsInformation processingFrequency spectrum
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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