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Personalized recommendation method based on bilateral diffusion of bipartite network
The invention discloses a personalized recommendation method based on bilateral diffusion of a bipartite network, which mainly solves the conflicts among several main arithmetic performance indexes including accuracy, diversity and novelty of a recommendation list with respect to personalized recommendation of Top-N. The method comprises the following steps: (1) constructing a user-article associated bipartite graph network, wherein it is supposed that each target user node has certain allocable resource, which can be allocated to other node objects according to a preset allocation mechanism; (2) establishing an article-article and user-user second-order correlation matrix; (3) implementing a bilateral diffusion process to obtain a user-article interest matrix; and (4) giving a recommendation list of each user with the length N to complete the recommendation of Top-N. Based on the thought of network communication, the effect of the method is obviously better than that of a classical collaborative filtering method, the long tail mining concerned by a personalized recommendation system is better realized, and the method can be used for solving the Top-N problem of personalized recommendation.
Owner:XIDIAN UNIV
Rotationally symmetrical coherent verification phantom (virtual patient) with a flat detector disposed on a rotary axis integrated in a multi purpose qc-accessory
InactiveUS20120305793A1Without loss of accuracyMaterial analysis by optical meansPhotometry using electric radiation detectorsRotational axisTwo dimensional detector
A quality control accessory (QC accessory) is provided which is adapted for use in linear accelerator quality control or in verification of an arbitrary isocentric radiation treatment plan of a patient or radiation sensitive body. The accessory includes an absorber, a detector and an optional orientation device. The absorber is rotationally symmetric, preferably spherical or hemispherical. The detector is adapted to be fixed in a stationary spatial relationship with respect to the absorber. The optional orientation device is adapted to maintain the two dimensional detector (2d detector) and the absorber in a fixed relative spatial relationship with respect to the beam focus of the linear accelerator, when the gantry is rotated, so that the central axis of the beam is essentially orthogonal to the 2d detector and the phantom axis of symmetry is parallel to or aligned with the central axis of the gantry rotation axis.
Owner:MOETTELI JOHN BRENT
Tunnel geology comprehensive advanced forecasting expert system and implementation method thereof
ActiveCN103513293AImprove accuracyReduction of geological disastersGeological measurementsMethod selectionBusiness forecasting
Owner:GUANGXI UNIV
High-speed measuring electronic digital outside micrometer
ActiveUS8091251B1Without loss of accuracyFaster and precise travelMicrometersMechanical measuring arrangementsLinear motionMicrometer
A high-speed measuring electronic digital outside micrometer allowing a user to make measurements quickly and effectively compared to conventional electronic outside micrometers with rotary thread spindles, which have limited measuring speed. This high-speed measuring electronic digital outside micrometer features: a linear motion digital sensor, a linear scale digital sensor, a linear motion digital sensor base, a digital display unit, an electronic processing unit, a micrometer body, a linear spindle, a linear spindle movement unit, a spindle control unit, a micrometer anvil, and retractable springs. In a stationary position, the measuring surface of the micrometer anvil and the linear spindle are in contact to the other. By operating the spindle control unit, it will create distance between the micrometer anvil and the linear spindle measuring surface. This distance is a measurable distance of the micrometer. By set free of the spindle control unit, the retractable springs will re-set the micrometer to its stationary position.
Owner:ZHANG YANCHEN +1
Routing method for distributed cognition radio network based on layer-striding design
InactiveCN101437273AOptimize adjacent hop interferenceMinimize routing hopsTransmission monitoringWireless communicationRadio networksFrequency spectrum
The invention discloses a method for distributed type cognitive radio network routing based on cross-layer design, which belongs to the technical field of cognitive radio network. The method comprises the following steps: establishing a coloring multi-graph model according to useable frequency spectrum information acquired by node perception; transferring a cross-layer design routing algorithm to search the routing between a source node and a target node, and simultaneously selecting communication signal channels between adjacent nodes; and updating the topology of coloring multi-graph and interface number of the nodes. The routing method adopts the cross-layer design on the routing selection of a network layer and an MAC layer, and concretely optimizes routing hop number and adjacent hop interfere under the condition of lower time complexity. The method is applicable to radio network, next generation heterogeneous network and so on.
Owner:UNIV OF SCI & TECH BEIJING
Image recognition method and device
InactiveCN105335753AReduce the number of featuresImprove user experienceCharacter and pattern recognitionDimensionality reductionPrincipal component analysis
The invention relates to an image recognition method and device. The method comprises the following steps that: the features of a target image are extracted; dimensionality reduction is performed on the features of the target image according to a principal component analysis method; and the target image which has been subjected to dimensionality reduction is recognized according to a pre-trained image model. With the image recognition method adopted, a terminal can perform dimensionality reduction on the features of the target image according to the principal component analysis method, and therefore, the number of the features of the target image can be decreased, and the key features of the target image can be reserved; the terminal can recognize the target image which has been subjected to dimensionality reduction according to the pre-trained image model; and therefore, the efficiency of image recognition can be improved, and the accuracy of image recognition will not be reduced, and the use experience of a user can be improved.
Owner:XIAOMI INC
PCB secondary and multiple accurate punching method based on visual tracking
InactiveCN108966500AReduce distractionsEasy extractionCircuit board tools positioningPunchingVision based
The invention discloses a PCB secondary and multiple accurate punching method based on visual tracking. After the image information of the PCB is obtained through the vision system, the image information is subjected to binaryzation through a cvThreshold function; calculating a communication domain which exists on the processed image by utilizing a FindBlobs function, and filtering the communication domain which is smaller than the area; accurately positioning the edge by means of a Zernike moment edge operator in the possible edge points after all possible edge points are quickly found through a Sobel operator, and calculating to obtain the center position coordinates of the Mark points or the prefabricated hole according to the edge coordinates. The data volume of the points needing to be calculated is greatly reduced, and the speed of determining the center coordinates is increased, and the accuracy is not lost; by adopting a multi-time punching mode, the center coordinates of the prefabricated hole are positioned again during each punching, and the deviation problem possibly caused by single positioning is corrected, the drill bit is a grinding process of the edge of the prefabricated hole punched previously during multiple times of punching, and the precision is far higher than that of the single punching.
Owner:向耀
LLVM-based automatic performance prediction method for scientific calculation program
ActiveCN105183650AHigh precisionSolve problemsSoftware testing/debuggingPrediction methodsStatic analysis
The invention discloses an LLVM-based automatic performance prediction method for a scientific calculation program, and belongs to the technical field of program performance prediction. The automatic performance prediction method aims at achieving automatic analysis of the scientific calculation program and improving the accuracy of static analysis, and meanwhile program prediction time can be given finally. The automatic performance prediction method is characterized by including the steps of converting the predicted source program into an intermediate bitcode in an LLVM; analyzing the intermediate bitcode to obtain a calling time number, a circulating time number and a static branch probability for identifying a communication command MPI; carrying out mixed pile penetrating on the intermediate bitcode; carrying out code deletion on the intermediate bitcode obtained after mixed pile penetrating to carry out optimizing; running the optimized intermediate bitcode to obtain llvmprof.out files; analyzing the llvmprof.out files, and predicting execution time in cooperation with command time. The automatic performance prediction method is suitable for predicting the performance of the scientific calculation program.
Owner:哈尔滨工业大学人工智能研究院有限公司
Hydraulic clutch and method for determining an adaptive clutch fill volume or return spring pressure
The invention relates to a hydraulic clutch and a method for determining an adaptive clutch fill volume or return spring pressure. The application discloses a method for learning a characteristic filling volume of a hydraulic clutch (22). The method comprises iterative steps of applying a pressure pulse to the hydraulic clutch (22) when the clutch is in a disengaged state and determining an inflection event at an input or at an output of a torque path in which the hydraulic clutch (22) is situated. A characteristic filling volume of the hydraulic clutch (22) is derived from the determined inflection event. Furthermore, the application discloses a method for learning a characteristic return spring pressure of the hydraulic clutch (22), for engaging the hydraulic clutch (22) and corresponding devices for carrying out the methods according to the application.
Owner:GM GLOBAL TECH OPERATIONS LLC
Tumble detection method based on video articulation points and hybrid classifier
ActiveCN110532850ASolve the problem that the human body posture cannot be accurately estimatedFully express fall behavior characteristicsCharacter and pattern recognitionNeural architecturesAlgorithmManual extraction
The invention discloses a tumble detection method based on video articulation points and a hybrid classifier. A traditional video-based fall detection algorithm depends on manual extraction of fall features, fall is detected by means of a linear discriminant classifier method, the model is simple, but the accuracy is low. The method comprises the following steps: 1, extracting each frame of imageof a detected video clip; 2, acquiring a human joint data matrix; 3, establishing a plurality of behavior matrixes; and 4, calculating a time characteristic parameter and a space characteristic parameter; 5, carrying out primary classification; 6, carrying out secondary classification. According to the method for extracting the human skeleton joint points, the problem that the human posture cannotbe accurately estimated by extracting the human aspect ratio, the projection area and the like through a traditional method is solved. The behavior matrix is constructed by adopting the sliding window with the fixed size, modeling can be performed on time and space axes at the same time, and falling behavior characteristics are fully expressed.
Owner:HANGZHOU DIANZI UNIV
Fine-grained image recognition method, convolutional neural network and training method thereof
PendingCN112257758AThe identification method is simpleImprove accuracyCharacter and pattern recognitionNeural architecturesNeural network nnImage identification
The invention relates to a fine-grained image recognition method, a convolutional neural network and a training method thereof, computer equipment and a computer readable storage medium. The method comprises the steps of obtaining an original image; extracting global features of the original image by adopting a convolutional network; determining a plurality of candidate regions in the original image, and determining a feature value of each candidate region according to the global feature; sorting the plurality of feature values to obtain a first sorting result, and determining at least one candidate region corresponding to the maximum N feature values in the first sorting result; extracting features of the at least one candidate region to obtain at least one local region feature, each candidate region corresponding to one local region feature; cascading the global feature and the at least one local region feature to obtain a cascading feature; classifying the original images accordingto the cascade features to obtain the classification result, so that the problems of complexity and high labeling cost of a fine-grained image recognition method are solved, and the fine-grained imagerecognition method is simplified.
Owner:ZHEJIANG DAHUA TECH CO LTD
Parawing four-freedom-degree semi-physical simulation platform
ActiveCN107121940ASimple structureIntuitively reflect the state of exerciseSimulator controlLoop controlControl system
The invention provides a parawing four-freedom-degree semi-physical simulation platform which comprises a casing body, a data acquisition system, a motion control system, an umbrella-mounted control system and a model state solving system. The data acquisition system acquires the position information of the simulation platform. The umbrella-mounted control system receives the position information, and acquires the corresponding control amount according to a homing control algorithm. The model state solving system receives the control amount, receives an interference instruction from an interference device, decodes a status instruction and feeds back the status instruction to the umbrella-mounted control system to control the motion control system. The platform moves based on different control instructions, and can simulate action caused by a wing umbrella system for different trailing edge parachute cord manipulated variables in actual air-drop. The data acquisition system and the umbrella-mounted control system form closed-loop control. The control effect is visually reflected in the motion law of the platform, and the position and attitude can be measured accurately. The effectiveness of the control algorithm can be verified before air-drop, which greatly reduces the experimental cost and the experimental risk.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Intelligent inquiry method and device
PendingCN111180081AReduce the number of interactionsImprove diagnostic efficiencyMedical data miningMedical automated diagnosisDiseaseEmergency medicine
The invention discloses an intelligent inquiry method and device, and the method comprises the steps: selecting a disease distinguishing symptom from the related symptoms of a candidate disease when the accuracy of the selected candidate disease does not meet a preset confirmation condition, wherein the disease distinguishing symptom is a symptom capable of distinguishing at least two types of candidate diseases; and taking the disease distinguishing symptom as the next inquiry symptom to be displayed to the user, and determining a diagnosis result according to the received description information of the user for the disease distinguishing symptom. According to the invention, on the basis of accurately obtaining the diagnosis result, the number of interactions with the user is reduced, thediagnosis efficiency is improved, and the diagnosis accuracy is not lost.
Owner:ZHONGAN INFORMATION TECH SERVICES CO LTD
Federal learning privacy protection system and method based on hierarchical aggregation and block chain
PendingCN114254386AImprove accuracyRealize traceabilityDigital data protectionData setProtection mechanism
The invention provides a federated learning privacy protection system and method based on hierarchical aggregation and a block chain. The system comprises a trusted mechanism, the block chain, a federated learning module and an IPFS distributed storage system. The block chain is used for recording various data generated by the federal learning module and model addresses corresponding to training models of various versions iterated all the time in the training process; the federated learning module is used for realizing federated learning training; the user terminal obtains a current global model as a local model, and trains the local model on a local data set to obtain a new round of local model; and the IPFS distributed storage system is used for storing local model parameters and global model parameters. Based on the system provided by the invention, the technical problems of low efficiency, reduced model accuracy and large storage overhead of a federal learning privacy protection mechanism in the prior art are solved, the federal learning efficiency can be improved, and the global model accuracy can be improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
Power injection model of power flow controller under direct current power flow model and addressing method thereof
ActiveCN105470948AImprove site selection speedWithout loss of accuracyForecastingAc network circuit arrangementsPower injectionPower grid
The invention relates to a power injection model of a power flow controller under a direct current power flow model. In a direct current power flow, an effect of the power flow controller on a system is equivalent to voltages of nodes i and j and power injection equivalence is performed so as to acquire the power injection model under the direct current power flow; shift-to power of the nodes i and j is defined in the description, and xij is an impedance between the nodes i and j. The model and the method have advantages that the method provided in the invention is used to carry out power flow controller addressing so that an addressing speed can be increased and simultaneously accuracy can be achieved; and the model and the method are especially suitable for a UPFC addressing problem of a large power grid.
Owner:STATE GRID JIANGSU ECONOMIC RES INST +2
Indicator and method for cable core correction and transformer tripping outlet correction
ActiveCN103163419AThe result is intuitive and accurateImprove efficiencyBase element modificationsElectrical testingTransformerComputer module
The invention relates to an indicator and a method for cable core correction and transformer tripping outlet correction, and belongs to the technical field of power supply maintenance. According to the technical scheme, an internal detection circuit (102) is formed by parallelly connecting N identical relay action keeping modules, the relay action keeping modules are independent from each other, and each relay action keeping module comprises a relay action part and a switching control keeping part; peripheral equipment comprises a power input part (101) and an operation indicating part (103); and the operation indicating part comprises an operation panel with N pairs of sockets and an indicating lamp, wherein the pair quantity N of the sockets is matched with the quantity N of the relay action keeping modules, and the operation indicating part is used for wiring and indicating the closure conditions of contacts after relays act. By adopting the indicator and the method, the turn-on and turn-off condition of a cable core and the insulation condition of other wire cores can be directly learnt; in tripping matrix test, the action result can be intuitively and accurately judged by viewing the indicating lamp of the external indicating panel; and the indicator is easy to operate, convenient to use and quick and accurate in detection and correction.
Owner:STATE GRID CORP OF CHINA +1
Method for predicting horizontal electromagnetic scattering mean of ship loaded with cylindrical whip antenna
ActiveCN102788908AGet it quickly and accuratelyThere is no fitting errorElectromagentic field characteristicsPhysical opticsWhip antenna
The invention provides a method for predicting a horizontal electromagnetic scattering mean of a ship loaded with a cylindrical whip antenna. The method comprises the following steps: 1), according to geometric information of the cylindrical whip antenna loaded on the ship, computing single station RCS (radar cross section) values in the horizontal direction of the cylindrical whip antenna by a physical optical estimating formula; 2), establishing a geometrical model of the ship except the cylindrical whip antenna, and computing the mean of the single station RCS values in the horizontal direction of the geometrical model by a conventional ship electromagnetic scattering predicting method; and 3), superposing an RCS algebraic sum of the single station RCS values in the horizontal direction of the cylindrical whip antenna and the mean of the single station RCS values in the horizontal direction of the geometrical model of the ship except the cylindrical whip antenna by adopting a random phase summing method, so as to obtain the horizontal electromagnetic scattering mean of the ship loaded with the cylindrical whip antenna. The cylindrical whip antenna and the other components of the ship are computed separately, so that the grid number and the corresponding computation amount are maintained on a magnitude when the whip antenna is not loaded, and the difficulty that computation cannot be carried out by a planar element method can be avoided.
Owner:CHINA SHIP DEV & DESIGN CENT
User defined simulation method for electrical power system based on mixed variable step size stimulation
ActiveCN106294901AReduce redundancyCalculation speedSpecial data processing applicationsUser-defined functionSimulation methods
The invention provides a user defined simulation method for an electrical power system based on mixed variable step size stimulation. A user defined function of an analyzing packaged program of the electrical power system is optimized through the pretreatment, initialization and stimulation calculation of a user defined model; the redundancy of the user defined model is reduced when the dynamic process of the system is stable; the calculation speed is increased while the acceptable accuracy of the engineering calculation is not lost; the fine accurate calculation is performed in the to-be-concerned period; the mixed step size stimulation function in the electromechanical-electromagnetic transient and electromechanical-medium and long term processes of the analyzing packaged program of the electrical power system is achieved; the variable step size stimulation is realized to some extent; the calculation convergence, accuracy and calculation efficiency of the analyzing packaged program of the electrical power system are increased; the use scope of the analyzing packaged program of the electrical power system is widened.
Owner:CHINA ELECTRIC POWER RES INST +2
Signal delay elimination method for silver self-powered detector based on H infinity filtering
InactiveCN104900280AEasy to handleDelay Elimination ProcessingNuclear energy generationNuclear monitoringPower detectorNuclear reaction
The invention discloses a signal delay elimination method for a silver self-powered detector based on H infinity filtering, which comprises the following steps: 1)establishing a nuclear reaction model of silver and thermal neutron; 2)employing decoupling transformation to establish a discrete state equation corresponding to the nuclear reaction model; 3)determining the instantaneous response share of the current of the silver self-powered detector; and 4)using a H infinity filter for delay elimination of the current signal of the silver self-powered detector. The method is capable of performing delay elimination on the current signal of the silver self-powered detector, noise can be effectively inhibited, normal usage of the silver self-powered detector can be carried out under transient condition of a reactor, due to the H infinity filter, prediction of the statistics characteristic of external disturbance input signal is not required while delay elimination is carried out.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Rhodium self-powered detector signal delaying eliminating method based on IIR filtering
ActiveCN104882182ASimple processSimple designNuclear energy generationChemoinformaticsPower detectorSignal delay
The invention discloses a rhodium self-powered detector signal delaying eliminating method based on IIR filtering. The method comprises the following steps: step 1. establishing a rhodium reaction model of rhodium and thermal neutrons; step 2. establishing a rhodium self-powered detector signal system model; step 3. establishing a delaying eliminating module and a noise inhibition module respectively; and step 4. finishing a parameter design of a delaying eliminating system before the delaying eliminating system is operated, and operating the delaying eliminating system in real time to realize the delaying elimination of a signal. The rhodium self-powered detector signal delaying eliminating method has a whole simple procedure; and the signal delaying elimination and the noise inhibition are separated so that the method is convenient to realize, popularize and apply. By virtue of the rhodium self-powered detector signal delaying eliminating method, the delaying eliminating problem of the signal of a rhodium self-powered neutron detector in a reactor is solved; and the rhodium self-powered detector current signal is directly used for a subsequent link of an advanced reactor core measurement system, and the accuracy is not lost.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Scrambling appraisal system
InactiveCN101783085AIncrease the difficulty of cheatingIncrease the difficultyElectrical appliancesTest questionEXAMINATION ROOM
The invention provides a scrambling appraisal system used for appraisal or study, comprising a scrambler module and a terminal presenting a scrambling result, wherein the scrambler module can scramble a test question sequence and / or a choice question option sequence, and the terminal presenting the scrambling result is used for providing a scrambled test question information to a person who participates in appraisal or studies. In this way, the achieved effects are as follows: actually, the same test paper can derive multiple test papers with different answers by scrambling, thus avoiding cheating phenomena, and the invention has the important meaning for purifying examination room culture and embodying the righteousness and fairness of an examination.
Owner:许小丹
Contaminated film character identification method
ActiveCN108734167ARealize identificationReduce workloadCharacter and pattern recognitionTemplate matchingWorkload
The invention discloses a contaminated film character identification method, comprising the following steps of carrying out binarization processing on a film character image; obtaining sizes of normalcharacter blocks and interval pixels among the character blocks; establishing and annotating feature templates; finding a completely matching point in a to-be-identified character image; carrying outbidirectional character segmentation starting from the complete matching point, thereby obtaining to-be-identified character blocks; carrying out template matching on all to-be-identified character blocks and the feature templates, thereby obtaining an identification result of the to-be-identified character blocks; and carrying out connection on annotations corresponding to each to-be-identifiedcharacter block in sequence, thereby obtaining a whole character string identified from the to-be-identified character image. According to the method, few feature templates are constructed in two modes of the to-be-identified image characters, the to-be-identified characters are segmented into a plurality of character blocks, and all character blocks are matched with the feature templates, so thespecial character image is identified, the workload is low, the efficiency is high and the accuracy is achieved.
Owner:SHIDAI IND AUTOMATION
Delay eliminating method for signal of self-powered silver detector based on H2/H-infinity hybrid filtering
InactiveCN104882170AEasy to handleDelay Elimination ProcessingNuclear energy generationChemoinformaticsHybrid filterEngineering
The invention discloses a delay eliminating method for a signal of a self-powered silver detector based on H2 / H-infinity hybrid filtering. The delay eliminating method sequentially comprises the following steps of 1, establishing a nuclear reaction model of silver and thermal neutrons; 2, establishing a discrete state equation corresponding to the nuclear reaction model through decoupling transform; 3, determining the instant response share of the current of the self-powered silver detector; and 4, carrying out delay elimination on a current signal of the self-powered silver detector by using an H2 / H-infinity hybrid filter. When the delay eliminating method is applied, a current signal of a self-powered silver neutron detector can be subjected to delay elimination, and noise can also be effectively inhibited, so that the self-powered silver neutron detector can also be normally used under the instantaneous condition of a reactor; in addition, a filtering error variance corresponding to an error measuring channel is only required to have an upper bound in the method, so that the self-powered silver neutron detector can also be normally applied when an input signal is an indeterminable signal with limited energy.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Fuzzy correlation opportunity planning-based energy storage-containing comprehensive energy system scheduling method
PendingCN111860966AReduce computational complexityWithout loss of accuracyForecastingEnergy storagePower system schedulingIntegrated energy system
The invention discloses a fuzzy correlation opportunity planning-based energy storage-containing comprehensive energy system scheduling method, which belongs to the technical field of power system scheduling, and specifically comprises the steps of performing mathematical modeling on energy storage equipment in a comprehensive energy system, and linearizing the loss cost of single energy storage charging and discharging; building fuzzy representation of the wind power and load prediction uncertainty, and relaxing the power balance equation containing the uncertainty; converting the power balance equation into a maximum opportunity function, taking the maximum opportunity function as one of target functions, and establishing a multi-target day-ahead optimization scheduling model taking maximum fuzzy event possibility and minimum operation cost as targets; constraining the output of other equipment in the comprehensive energy system, specifically including combined cooling heating and power equipment constraints, gas boiler constraints, electric refrigerator constraints and power grid exchange power constraints; and solving the established multi-target day-ahead scheduling model to obtain an optimal day-ahead scheduling result. The related opportunity planning method in the fuzzy environment is applied to comprehensive energy system scheduling, and economic operation of the system is achieved while safe and reliable energy supply is guaranteed.
Owner:SOUTHEAST UNIV +1
Method for eliminating signal delay of silver-self-powered detector on basis of H2 filtering with form of Luenberger
InactiveCN104778980AEasy to handleDelay Elimination ProcessingNuclear energy generationNuclear monitoringNuclear engineeringPower detector
The invention discloses a method for eliminating the signal delay of a silver-self-powered detector on the basis of H2 filtering with the form of Luenberger. The method comprises the following successive steps: (1) establishing a nuclear-reaction model of silver and thermal neutrons; (2) establishing a discrete state equation corresponding to the nuclear-reaction model by adopting decoupling transformation; (3) determining instantaneous response portion of current of the silver-self-powered detector; and (4) carrying out delay elimination on current signals of the silver-self-powered detector by adopting an H2 filter with the form of Luenberger. The method disclosed by the invention has the advantages that in application, the delay elimination processing can be carried out on the current signals of the silver-self-powered neutron detector, the noise can be effectively suppressed, so that the silver-self-powered neutron detector also can be normally used when in an instantaneous condition of a reactor; and since the H2 filter with the form of Luenberger is adopted, the statistical characteristic of external disturbance input signals do not need to be known in advance when the delay elimination is carried out.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Delay eliminating method for signal of self-powered vanadium detector based on H-infinity filtering
InactiveCN104882181ADelay Elimination ProcessingNormal solutionNuclear energy generationNuclear monitoringNuclear reactionEquation of state
The invention discloses a delay eliminating method for a signal of a self-powered vanadium detector based on H-infinity filtering. The delay eliminating method sequentially comprises the following steps of 1, establishing a nuclear reaction model of vanadium and thermal neutrons; 2, establishing a discrete state equation corresponding to the nuclear reaction model through direct transform; 3, determining the instant response share of the current of the self-powered vanadium detector; and 4, carrying out delay elimination on a current signal of the self-powered vanadium detector by using a H-infinity filter. When the delay eliminating method is applied, a current signal of a self-powered vanadium neutron detector can be subjected to delay elimination, and noise can also be effectively inhibited, so that the self-powered vanadium neutron detector can also be normally used under the instantaneous condition of a reactor; in addition, due to the adoption of the H-infinity filter, the statistical property of an external disturbance input signal is not needed to be known in advance during delay elimination.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Shooting stabilizer for hand-held precision weapons
ActiveUS20140013646A1Increase shooting precisionGood reproducibilityAmmunition loadingWeapon cleaningHand heldGun barrel
A stabilizer device (100) for a firearm, apt to control the movement performed by the firearm barrel (11) in the instant in which a bullet is ejected, comprising a support element (1) for the firearm barrel (11), removably fixed or fixable to the barrel (11) and apt to be made slidable along a main direction of extension of the barrel (11) with respect to the stock (13) of the firearm that can be gripped by a shooter, and control means for controlling the sliding motion of the support element (1) with respect to the stock (13) of the firearm, having a first (14; 140) and a second (15; 150) control element constrained or constrainable respectively to the support element (1) and to the stock (13) and apt to cooperate to limit and control the extent of such sliding.
Owner:TEC R A S - TECHA PER LA RICERCA AMBIENTE E SCUOLA SOC COOP
Method and device for estimating channel
InactiveCN101888354AReduce sampling pointsReduced complexity and processing latencyMulti-frequency code systemsTransmitter/receiver shaping networksTime delaysFrequency domain
The invention discloses a method and a device for estimating a channel. The method comprises the following steps of: presetting extracting multiple of at least two stages, and dynamically determining the current extracting multiple according to link quality; according to the current extracting multiple, extracting a received frequency domain demodulation reference mark and a local frequency domain demodulation reference mark; and figuring out the current frequency domain chain estimated value by using the extracted received frequency domain demodulation reference mark and the local frequency domain demodulation reference mark. The device comprises an extracting multiple judging module, a pilot frequency extraction module and a channel estimation module, wherein the extracting multiple judging module is used for presetting the extracting multiple of the at least two stages, and dynamically determining the current extracting multiple according to the link quality; the pilot frequency extraction module is used for extracting the received frequency domain demodulation reference mark and the local frequency domain demodulation reference mark according to the current extracting multiple; and the channel estimation module is used for figuring out the current frequency domain chain estimated value through the extracted received frequency domain demodulation reference mark and the local frequency domain demodulation reference mark. The method and the device have the advantages of reducing the complexity of a receiver and reducing the processing time delay.
Owner:ZTE CORP
Delay elimination method of rhodium detector signal based on Luenberger form H2/H infinity hybrid filtering
InactiveCN104900279AEasy to handleDelay Elimination ProcessingNuclear energy generationChemoinformaticsPower detectorNuclear reaction
The invention discloses a delay elimination method of a signal of a rhodium self-powered detector based on Luenberger form H2 / H infinity hybrid filtering, which comprises the following steps: 1)establishing a nuclear reaction model of rhodium and thermal neutron; 2)employing decoupling transformation to establish a discrete state equation corresponding to the nuclear reaction model; 3)determining the instantaneous response share of the current of the rhodium self-powered detector; and 4)using a H infinity filter for delay elimination of the current signal of the rhodium self-powered detector. The method is capable of performing delay elimination on the current signal of the rhodium self-powered detector, noise can be effectively inhibited, normal usage of the rhodium self-powered detector can be carried out under transient condition of a reactor. The method requires that error variance of filtering corresponding to a measured error channel has an upper bound, so that when the input signal is an indeterminate signal possessing limit energy, the normal application of the rhodium self-powered detector can be carried out.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Picture character recognition method
InactiveCN106778727AImprove accuracyRelatively small workloadCharacter and pattern recognitionStandard Template LibraryCharacter recognition
The invention provides a picture character recognition method. The picture character recognition method comprises the following steps of: reading a text area, on a picture, frame-selected by a user in a current picture form; respectively selecting each pixel character in the frame-selected text area; comparing the first pixel character in the frame-selected text area with each matrix character in matrix libraries corresponding to various conventional fonts so as to find matrix characters with the highest similarity; and recording the matrix libraries of the matrix characters with the highest similarity, defining the matrix libraries as standard matrix libraries, respectively finding the matrix characters with the highest similarity in the standard matrix libraries, and outputting the matrix characters with the highest similarity in an editable character form. According to the method, the character information in pictures can be correctly and efficiently recognized.
Owner:高格(天津)信息科技发展有限公司
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