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199results about How to "Reduce computing time" patented technology

Method and device for avoiding obstacle of unmanned aerial vehicle

The invention provides a method and a device for avoiding an obstacle of an unmanned aerial vehicle. The method comprises the following steps of: detecting and judging whether the obstacle or an emergent threat exists in the forwarding direction of the unmanned aerial vehicle in real time; if the obstacle or the emergent threat exists, establishing an obstacle region at which the obstacle or the emergent threat is located, and establishing a collision avoidance behavior region according to an obstacle side closest to the unmanned aerial vehicle in the obstacle region; if the unmanned aerial vehicle enters the collision avoidance behavior region, calculating an obstacle avoidance velocity vector according to the closest obstacle side, wherein the obstacle avoidance velocity vector comprises obstacle avoidance velocity and obstacle avoidance direction of the unmanned aerial vehicle; calculating forwarding step of the unmanned aerial vehicle according to the obstacle avoidance velocity vector obtained through calculation; if not any obstacle or emergent threat is detected, calculating a target guide velocity vector according to target position, and calculating forwarding step of the target guide velocity vector; judging whether to achieve the target, if the target is not achieved, detecting and calculating again; or ending.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI

Intelligent question-answering system for tax consultation service

The invention belongs to the field of artificial intelligence technology and particularly discloses an intelligent question-answering system for tax consultation service. The system comprises a terminal device where an Android operating system is installed and a computer; an application software program is installed in the terminal, wherein the application software comprises a voice conversion module and a question return module; a service software system is installed on the computer, wherein the service software system comprises a question understanding module and a question retrieval module; when the system operates, the voice conversion module converts voice data output by a user into text data, semantic understanding is performed through the question understanding module, the question retrieval module is used for retrieving answers, and a processing result is transmitted to the terminal user through the question return module. According to the system, voice recognition, text classification, similarity calculation and other technologies are used comprehensively to form a method for performing text similarity matching on an incomplete data set in the area of expertise, profound semantic analysis can be performed on questions raised by taxpayers, and meanwhile ceaseless accurate consultation service is provided for mass users to meet the actual requirement for tax consultation.
Owner:FUDAN UNIV

Solver for hardware based computing

InactiveUS20090292520A1Reduce computing timeComputation using non-contact making devicesAnalogue computers for nuclear physicsOperational transconductance amplifierDynamo
Full-AC load flow constitutes a core computation in power system analysis. The present invention provides a performance gain with a hardware implementation of a sparse-linear solver using a Field Programmable Gate Array (FPGA). The invention also relates to the design, simulation, and hardware verification of a static transmission line model for analog power flow computation. Operational transconductance amplifiers are employed in the model based on a previously proposed DC emulation technique of power flow computation, and provide reconfigurability of transmission line parameters via transconductance gain. The invention also uses Analog Behavioral Models (ABMs) in an efficient strategy for designing analog emulation engines for large-scale power system computation. Results of PSpice simulations of these emulation circuits are compared with industrial grade numerical simulations for validation. The application is also concerned with the development of a generator model using analog circuits for load flow emulation for power system analysis to reduce computation time. The generator model includes reconfigurable parameters using operational transconductance amplifiers (OTAs). The circuit module is used with other reconfigurable circuits, i.e., transmission lines and loads.
Owner:DREXEL UNIV

SM2 (streaming multiprocessor 2) digital signature generating algorithm realizing method and device

The invention relates to an SM2 (streaming multiprocessor 2) digital signature generating algorithm realizing method and device. The method includes calculating an SM2 digital signature generating algorithm by coordination of a CPU (central processing unit) and a GPU (graphics processing unit), pre-calculating elliptical curve dots in the SM2 digital signature generating algorithm in the GPU to obtain a result and storing the result in a storage unit, pre-calculating one-added inverse calculation of a user private key in the CPU to obtain a result and storing the result in the storage unit, calling the results obtained by pre-calculation and stored in the storage unit when the CPU calculates a to-be-signed message sequence according to the SM2 digital signature generating algorithm calculating step. Accordingly, digital signature calculation time for to-be-signed messages is shortened, and calculation efficiency of the SM2 digital signature generating algorithm is improved. Further, the CPU can perform one-added inverse calculation on different private keys and store results in the storage unit, and calculation efficiency is further improved.
Owner:DATA ASSURANCE & COMM SECURITY CENT CHINESE ACADEMY OF SCI

Face key point tracking system and method applied to mobile device

The invention provides a face key point tracking system and method applied to a mobile device. The system is composed of an initial face frame detection module, a face key point regression model learning module, a face key point regression calculation module, a working mode determination module and a face key point post-processing module. The face key point regression calculation module includes a detection mode and a tracking mode; an initial face frame is used as an input to carry out regression calculation of a face key point model in the detection mode; and regression calculation of a current frame key point model is carried out by using a last-frame face key point model in the tracking mode. According to the system and method provided by the invention, on the basis of the face key point positioning technology having the detection mode and the tracking mode, initial face frame detection is only carried out at a first frame, the tracking mode is employed during a follow-up positioning process, and the key point positioning of the last frame is used as the input of the current frame. Therefore, the face detection module does not need to be invoked again during the tracking process, so that the calculation time is saved and the system efficiency is improved.
Owner:NANJING KIWI NETWORK TECH CO LTD

Reconfiguration method for compression sensing signal

InactiveCN102624399AReduce computational difficultyReduce computing timeCode conversionIteration processCompressed sensing
The invention provides a reconfiguration method for a compression sensing signal, which comprises the following steps: A) calculating an inner product (g1=phi Ty) of a signal y subjected to compression sensing treatment and each row of a sensing matrix phi, and taking the inner product as an inner product result of first iteration; B) judging if stopping iteration according to the inner product result gt of the iteration; if not, searching an index value lambda t corresponding to an element with the maximum absolute value from the inner product result gt of the iteration, adding the index value lambda t into an index set, calculating the inner product of the next iteration and starting the next iteration process, and returning to the step B, wherein t is the iteration index value and is the No. lambda t row of the matrix X=phi T phi; and if stopping, forming a matrix phi lambda by rows of the sensing matrix corresponding to different index values in the present index set, and reconfiguring the compression sensing signal according to the formed matrix phi lambda and the signal y, wherein the rows in the matrix phi lambda are arrayed according to the sequence of the index values from low to high, and lambda is the set composed of different index values in the present index set. According to the reconfiguration method provided by the invention, the calculating time and resource are saved.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Uniform PWM modulation method and system on the basis of natural commutation

The invention is suitable for the technical field of electric power, and provides a uniform PWM modulation method on the basis of natural commutation. The method comprises the following steps: a per-unit value of a three-phase modulated wave is calculated; a real-time maximum value and a real-time minimum value of voltage of the three-phase modulated wave are calculated according to the per-unit value; the phase of the three-phase modulated wave shifts for 30 degrees; the real-time maximum value and the real-time minimum value of the three-phase modulated wave after phase shifting are calculated; zero-sequence components under three modulation modes of SPWM, SVPWM and DPWMx are calculated according to the real-time maximum value and the real-time minimum value of the voltage of the three-phase modulated wave before phase shifting and the maximum value and the minimum value of the voltage of the three-phase modulated wave after phase shifting; the zero-sequence components under the three modulation modes of SPWM, SVPWM and DPWMx are super-positioned in the three-phase modulated wave before phase shifting so that a uniform modulated wave signal is acquired; and the uniform modulated wave signal and a carrier wave signal are compared by a controller so that a driving signal for controlling a switch tube is acquired.
Owner:SHENZHEN GROWATT NEW ENERGY TECH

Method for determining illumination intensity distribution of light source and mask pattern of photo-etching process

The invention relates to a method for determining the illumination intensity distribution of a light source and a mask pattern of a photo-etching process and belongs to the technical field of manufacturing of an integrated circuit. The method comprises the following steps of: determining the initial shape and initial illumination intensity of the light source, and representing the initial shape and the initial illumination intensity by matrixes; determining an initial pattern of a mask, and representing the initial pattern of the mask by a pixel matrix; adding two compensation items and establishing a target function by using imaging accuracy and focal depth in photo-etching process as a basic optimization target; calculating and normalizing the illumination intensity distribution after the mask pattern is subjected to action of a photo-etching system; repeating the calculation step until a condition of convergence is met; obtaining a light source matrix and calculating an imaging nucleus of the photo-etching system and coefficients of the imaging nucleus; calculating an illumination intensity distribution matrix; calculating a pattern which is etched on a silicon wafer and representing the pattern by the matrix; calculating the gradient of the target function on the matrix; updating the matrix; and repeating the calculation step until the condition of convergence is met. The method for optimizing the light source and the mask of the photo-etching process has the advantages of short time and good optimization effect.
Owner:TSINGHUA UNIV

EBM variable direction forming dynamic slicing method cooperated with 840D numerical control system

The invention discloses an EBM variable direction forming dynamic slicing method cooperated with an 840D numerical control system. The EBM variable direction forming dynamic slicing method comprises the steps of establishing a vertex array object VAO, adjusting a projection matrix to the slicing height during rendering of a three-dimensional model and outputting a two-dimensional section binary image through a reverse ray tracing algorithm; acquiring data of a contour line from the binary image through a two-dimensional contour extraction method, outputting coordinates of an end-to-end closedcontour, connecting all adjacent coordinates into straight lines and connecting all the straight lines end to end to form a closed curve; and dividing the contour data into a straight line part and acurve part with the starting point of the small straight lines with the included angle of 140 degrees as the segmentation point when the triangle tolerance is one, removing neighbor points, repeated points and internal points of the same straight lines, conducting segmentation fitting on a slicing data curve through a NURBS curve and then conducting dynamic slicing through the 840D numerical control system. Through the EBM variable direction forming dynamic slicing method, the computing time and conversion errors of STL files are reduced, and meanwhile, the phenomenon of over-accumulation of straight line inflection points is reduced.
Owner:XI AN JIAOTONG UNIV

No-reference structural sharpness-based automatic focusing method

The invention discloses a no-reference structural sharpness-based automatic focusing method. The method includes the following steps that: step S1, grayscale processing is performed on an original image; step S2, image preprocessing is performed with a downsampling method; step S3, low-pass smoothing filtering is performed on a downsampled image, so that a reference image is obtained; step S4, overlapped blocking is performed on the downsampled image and the reference image according to a set block size and a moving step size, so that image sub-blocks are obtained; intra-block variances are calculated, a threshold parameter is set, and image sub-blocks of which the intra-block variances are greater than the threshold are selected; step S5, SSIM values are calculated for the selected imagesub-blocks corresponding to the down-sampled image and the reference image sequentially, and the image sharpness evaluation value, namely NRSS value, of the original image is calculated; and step S6,the NRSS value is converted into a voltage signal, and a lens receives the voltage signal and thereafter completes real-time automatic focusing. The method of the invention has strong robustness, saves calculation time, and well satisfies the real-time requirement of micro-circulation monitoring for automatic focusing.
Owner:GUANGZHOU MEDSOFT SYST LTD

Method for determining patient-specific blood vessel information

ActiveUS20170286628A1Reduce the amount of simulation calculationReduce computing timeMedical simulationCatheterCoronary circulationPatient specific
The present invention relates to a method for determining patient-specific blood vessel information. More specifically, the present invention relates to a method for determining patient-specific cardiovascular information by applying a simplified coronary circulation model thereto. Furthermore, the present invention relates to a method for determining a blood flow rate for branches of a blood vessel having originated from an artery of each patient. According to the present invention, the method for determining cardiovascular information by using a computer system comprises the steps of: receiving image data including a plurality of coronary arteries having originated from the aorta; processing the image data so as to generate a three-dimensional shape model of the plurality of coronary arteries; simulating a blood flow for the generated three-dimensional shape model of the plurality of coronary arteries; and determining a fractional flow reserve (FFR) of the respective coronary arteries with the blood flow simulation result. In the blood flow simulation step for the three-dimensional shape model of the plurality of coronary arteries, a computational fluid dynamics model is applied to the three-dimensional shape model of the coronary arteries, and a centralized parameter model to be combined with the computational fluid dynamics model uses a simplified coronary circulation model including coronary arteries, capillaries of the coronary arteries, and coronary veins.
Owner:KNU IND COOPERATION FOUND

Method and system for detecting SAG signal in DVR device

The invention provides a method for detecting an SAG signal in a DVR (Discharge Voltage Regulator) device. The method comprises the following steps: a, obtaining the number of sampling points according to preset sampling frequency and power frequency cycle, and setting a cyclic buffer region with the length equal to the number of sampling points; b, obtaining sampling values corresponding to the sampling points in the power frequency cycle and storing the sampling values in the cyclic buffer region according to a sampling time sequence to form an analytic window; c, when the sampling time of a next sampling point is reached, storing the sampling value of the point in the window, discarding the sampling value with the earliest sampling time in the window, and updating; d, performing wavelet analysis on each sampling value in the updated window to obtain a modulus maximum value of the point; e, judging whether the modulus maximum value is more than 0 or not; f, if so, determining that the SAG signal exists and the sampling time of the point is the starting moment of the SAG signal, and otherwise, returning to the step c. By implementing the method, the starting moment and amplitude of the SAG signal can be detected in real time and the purpose of reducing SAG fault detection time delay in the DVR device can be achieved.
Owner:SHENZHEN POWER SUPPLY BUREAU +2

Numerical Simulation of Flow Field and Convection/Radiation Coupling Heat Transfer in Multi-Nozzle Rocket

The invention provides a simulation method for the flow field and convection/radiation coupling heat transfer of a multi-nozzle rocket. Firstly, a three-dimensional model of the multi-nozzle rocket isestablished. Secondly, the multi-block structured mesh method is used to mesh the three-dimensional model. The mathematical model of plume field and convection heat transfer of multi-nozzle rocket isestablished again. S multicomponent equation is discretized and integrated by AUSM + scheme. The inviscid flux at the boundary of the model is obtained by differentiation. Then the improved radiationmodel DOM is opened to obtain the radiation absorption coefficient of the model: the integral of radiation heat transfer by DOM model. Differential fundamental equation discretization; The radiationintensity values of each point are obtained; Finally, use RNG k-Epsilon turbulence model, output Mach number, temperature, pressure flow field and convection/coupled heat flux cloud map; The method ofthe invention can not only improve the calculation accuracy but also reduce the calculation cost, and the calculation result can provide guiding significance for the thermal protection of the bottomof the rocket.
Owner:NANJING UNIV OF SCI & TECH
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