78 results about "Hermite functions" patented technology

A method for performing privacy-preserving or secure multi-party computations enables multiple parties to collaborate to produce a shared result while preserving the privacy of input data contributed by individual parties. The method can produce a result with a specified high degree of precision or accuracy in relation to an exactly accurate plaintext (non-privacy-preserving) computation of the result, without unduly burdensome amounts of inter-party communication. The multi-party computations can include a Fourier series approximation of a continuous function or an approximation of a continuous function using trigonometric polynomials, for example, in training a machine learning classifier using secret shared input data. The multi-party computations can include a secret share reduction that transforms an instance of computed secret shared data stored in floating-point representation into an equivalent, equivalently precise, and equivalently secure instance of computed secret shared data having a reduced memory storage requirement.

The invention relates to an unconditional stability finite-different time-domain (FDTD) algorithm. The unconditional stability FDTD algorithm expands a differential-form Maxwell equation set through an Associated Hermite (AH) orthogonal function, eliminates a time variable through the Galerkin principle, obtains a finite-dimension AH domain implicit equation for solution, and finally obtains the electromagnetic field time domain result through AH domain inverse transformation. According to the unconditional stability FDTD algorithm based on the AH orthogonal function, through the conversion from the time domain to the AH domain, the solution number of an unknown quantity is largely reduced, and the calculation efficiency is obviously improved. The whole calculation process has nothing to do with the time variable and is not limited by a traditional FDTD stability condition, and the calculation result is unconditionally stable. Through the characteristics, a new resolution method is provided for the problem of efficiently and rapidly calculating a complex electromagnetic field with a multi-scale characteristic.

The invention relates to a building wind tunnel pressure measurement test data compression method. The invention aims at solving the problem that the little attention is paid to frequency domain characteristics of wind load and correlation in the prior art, resulting in a data compression error and an actual application error. The statistical information of the data is reconstructed by the Hermite polynomial, and the spectrum information is reconstructed by the Beta function theory, and a compressed wind pressure filed can be reconstructed at last in combination with random simulation technology. By adoption of the building wind tunnel pressure measurement test data compression method provided by the invention, the building wind tunnel pressure measurement data of GB and TB levels can be compressed to the KB and MB levels, and a novel information extracting and modeling method is provided for the high-dimension time-course large data of the wind load changing with time and space so as to achieve the data compression purpose at last. The building wind tunnel pressure measurement test data compression method is applied to the field of building wind tunnel pressure measurement tests.

The invention discloses a phase shift keying signal blind detection method based on a plural discrete full-feedback neural network. In the method, according to a principle of decreasing energy function of the plural discrete full-feedback neural network, a Hermitian weight matrix capable of directly detecting phase shift keying signals is constructed, so that each multi-phase shift keying (MPSK) signal centralized constellation signal point is a stable equilibrium point of a Hopfield neural network; therefore, the blind detection of the MPSK signals is realized. The method can realize computing targets by only needing extremely short received data, and can be applied to statistic meaningless occasions. The search space is narrowed, the difficulty is reduced, the search time is obviously superior to that of other blind detection algorithms, and the system performance is correspondingly improved.

Systems and methods for efficiently conveying one or more communication channels over a transmission medium. Communication is effected by transforming an incoming digital bit stream into a Hermite-Gaussian information stream that includes a plurality of Hermite-Gaussian packets. This transformation is accomplished through the use of a plurality of Hermite-Gaussian basis functions. The Hermite-Gaussian information stream is then transmitted over the transmission medium. More particularly, digital bit streams carried on one or more incoming channels may be in the form of binary “on” and “off” bits. These digital bits are converted into a plurality of Hermite-Gaussian waveform components which together comprise a Hermite-Gaussian packet. The conversion process maps each of respective incoming digital bits to a corresponding one of a group of Hermite-Gaussian functions. Optionally, this mapping process could be implemented sequentially, or in parallel form, such that a first bit is mapped to a first Hermite-Gaussian function, a second bit is mapped to a second Hermite-Gaussian function, and so on, until the Nth Hermite-Gaussian function is reached, whereupon the process cycles back to the first Hermite-Gaussian function. In any case, the presence of a “1”, “on”, or “high” bit enables the corresponding Hermite-Gaussian function, whereas the presence of a “0”, “off”, or “low” bit disables the corresponding Hermite-Gaussian function. When enabled, each respective Hermite-Gaussian function specifies the transmission of a corresponding Hermite-Gaussian waveform component. Each waveform component is substantially confined within a range of values in both the frequency and time domains.

The invention discloses a novel flexible body structure high-order nonlinear finite element numerical simulation method based on a quintic Hermite shape function, and the method comprises the steps: deducing a quintic Hermite interpolation shape function and an attribute equation based on a quintic Hermite high-order interpolation theory; determining a flexible body structure unit and parameters, a physical model and a simplified hypothesis which need to be solved by the flexible body structure unit; establishing a mathematical motion partial differential equation of the flexible body structure unit in space and time and axial stretching limiting conditions, namely solving a mathematical model in a domain; and establishing a system equation of the flexible body structure unit, and adopting a Newton iteration method to carry out iterative solution on the parameters. The beneficial effects are that simulation precision of space deformation, rotation angle and curvature of the slender flexible body structure is improved; the continuity of the curvature at finite element nodes is ensured; rapid convergence is achieved, and particularly the prediction precision of the high-order vibration frequency of the flexible body is higher; and when the problems of transverse large gradient load and large bending of the flexible body are solved, higher precision guarantee is provided.

The invention provides a structural parameter correlation processing and reliability calculation method based on independent transformation and regression analysis. The method comprises the followingsteps: 1, determining random variables of a structure and sample points thereof or statistical characteristic parameters and correlation parameters; 2, in the step 1, if the sample points cannot be obtained, the sample points need to be generated according to the random variable distribution types and the corresponding statistical characteristic parameters; 3, selecting an optimal Copula functionaccording to the sample points and calculating Copula parameters and a joint probability density function between variables; 4, deducing a Hermite expansion formula of the structural response based ona random response surface method; 5, selecting a probability distribution point of which the undetermined coefficient is twice; 6, converting the collocation points by using Rosenblatt transform anda joint probability density function, and solving an undetermined coefficient based on a least square method; 7, solving the reliability of the structure by using a moment method or a Monte Carlo method. The method is scientific and good in manufacturability and has wide application and popularization value.

A technique for generating very-high-order Hermite functions needed for accurately simulating operation of various devices and structures involving propagation of electromagnetic waves. By using modified recursion formulas, the technique generates asymptotic Hermite functions, smooth Hermite functions or optimized smooth Hermite functions, allowing for very high orders of the functions to be generated without the intermediate function values becoming so large as to exceed the capacity of conventional computers. The disclosed method for generating smooth Hermite functions provides for generation of well-behaved functions of order 30,000 or higher.

The invention discloses an improved FISTA temperature field reconstruction algorithm based on ultrasonic waves, and the algorithm comprises the following steps: 1, dividing a measurement region into a certain number of discrete grids; step 2, constructing a temperature error objective function based on discrete grid points; step 3, based on the measured sound wave flying time data, solving the objective function by using an improved FISTA algorithm to obtain temperature distribution of the measurement area under the grid; and 4, carrying out cubic Hermite interpolation on the temperature distribution obtained under the measurement area grid to obtain the temperature field distribution of the whole measurement area. According to the improved FISTA algorithm provided by the invention, the physical information and the sound wave flying time of the detected area are utilized, and the rapid reconstruction of the temperature field is realized. By resetting the acceleration parameter, the problem of fluctuation instability in the iterative reconstruction process of the temperature field is solved. Meanwhile, according to the algorithm, a positive definite matrix is introduced into a gradient function, and the reconstruction speed and the reconstruction precision of the temperature field are improved.

The invention discloses a point cloud data non-uniform three-dimensional reconstruction method. Comprising the steps of scanning an object to obtain complete point set data, and performing preprocessing such as normal vector normalization; adding a brief contour line artificially for missing data, and obtaining a sparse point set; constructing a Hermite matrix by using the sparse point set and obtaining a normal vector; calculating the normal vector and the point set data to obtain an interpolation function, and then performing up-sampling to obtain a final point cloud; and performing triangulation operation to obtain a final three-dimensional reconstruction model. The invention also discloses a three-dimensional reconstruction system for non-uniform point cloud data, computer equipment and a computer readable storage medium. According to the invention, the object surface reconstruction problem of the missing part is solved by using the interpolation method, the missing part of the model can be freely modified by combining the shape information complementation of the artificial sketch, and a relatively complete reconstruction model can be obtained by well combining the geometric features of the sample points of the actual object and the features of the artificially added sketch.

The invention discloses an LMD equipment fault diagnosis method and system. An LMD algorithm is used to decompose equipment vibration signals, a nonlinear discrimination algorithm is used to remove a decomposition noise component and a trend term, a fractal signal component is retained, a piecewise Hermite interpolation function is used to interpolate an extreme point, least square fitting enveloping is utilized to separate a frequency modulation part, a DQ algorithm is used to estimate instantaneous frequency and calculate a corresponding instantaneous scale, a vibration signal detrending result is determined according to the analysis scale, a multi-fractal spectrum of the detrending signal is calculated, and coordinates of a left end point, a right end point and an extreme point of the multi-fractal spectrum are extracted as characteristic parameters of an equipment operation state to identify the equipment operation state. The algorithm is deployed to an equipment state monitoring system, the equipment operation state can be accurately distinguished, and the equipment state monitoring system has good flexibility and portability and is convenient for engineering application.

Methods and apparatus for approximation using polynomial functions are disclosed. In one embodiment, a processor comprises decoding and execution circuitry. The decoding circuitry is to decode an instruction, where the instruction comprises a first operand specifying an output location and a second operand specifying a plurality of data element values to be computed. The execution circuitry is to execute the decoded instruction. The execution includes to compute a result for each of the plurality of data element values using a polynomial function to approximate a complex function, where the computation uses coefficients stored in a lookup location for the complex function, and where data element values within different data element value ranges use different sets of coefficients. The execution further includes to store results of the computation in the output location.

The invention discloses a suspension system early fault detection method based on a random matrix theory and cumulative sum. The method comprises the following steps: S1, constructing an initial matrix based on the random matrix theory and big data; S2, converting the initial matrix into a batch random matrix through a preset moving window; S3, converting the batch random matrix into a non-Hermitematrix according to a random matrix theory monocyclic theorem; S4, calculating a characteristic value of the non-Hermite matrix, obtaining an MSR of the characteristic value according to the characteristic value, and taking the MSR as a health state value of the suspension system; and S5, realizing early fault detection of the suspension system through a cumulative sum function according to the obtained health state value of the suspension system. According to the method, the health state value of the suspension system is obtained through the random matrix theory, early fault detection is achieved through the historical value of the health state of the suspension system and the cumulative sum function, and the method has the advantages of being simple in detection and high in reliability.

The invention provides a mechanical structure residual life prediction method based on a Wiener process and P-EMD, and belongs to the technical field of mechanical product residual life prediction. The method comprises the steps that a P-EMD is adopted to decompose a collected vibration signal of a mechanical structure to obtain a plurality of IMFs, the P-EMD represents empirical mode decomposition based on particle swarm optimization and Hermite interpolation polynomial, and the IMFs represent eigenmode functions; calculating the approximate entropy of the IMF signal obtained by decomposition, and judging the degradation trend of the approximate entropy; and based on the change trajectory of the approximate entropy, predicting the residual life of the mechanical structure by using a residual life prediction model based on a Wiener process. The method can improve the prediction precision of the residual life of the mechanical structure.

The invention provides an incremental capacity curve determination method based on real vehicle charging data, and the method employs a Hermite interpolation polynomial to fit the function relation between the capacity and the voltage in each charging segment, can guarantee the precise calculation of the characteristics of an incremental capacity curve, remarkably reduces the demands for calculation resources, and improves the calculation efficiency. Therefore, implementation of real-time SOH estimation of the new energy vehicle based on a remote big data platform is facilitated, and the method has many beneficial effects which are not achieved in the prior art.

The invention discloses a test method for judging the quality of a fitted curve. The test method includes the steps: multiplying the point data with large discrete point data difference after fine adjustment of the data by a weight, re-fitting, if the weight exceeds a threshold value, executing fitting curve descending processing, namely, subtracting one from the fitting curve frequency, and reasonably removing one discrete data point according to the reliability of the acquired data to perform descending fitting; and comparing discrete points of the curve subjected to the reduced-order fitting with the original data, and determining whether to execute B spline curve fitting processing or not according to a threshold value, i.e., if the reduced-order fitting still cannot meet the thresholdvalue requirement, fitting the original discrete data by using a B spline function. According to the test method, on the basis of polynomial function processing, the processing means of fitting curvedescending order and B spline curve fitting are combined to solve the problem of serious oscillation of the curve caused by the Runge phenomenon of the polynomial function, thus guaranteeing that thefitted curve is close to a real curve; and the test method has the advantages of simple form and fixed solving method, and meets the use requirements.

The invention provides a Hermite function constraint-based data fusion calculation method, comprising the following steps: representing a target track parameter by using a Hermite function, representing an original measurement element provided by a measurement system by taking the target track parameter as a base function so as to obtain an error equation of the original measurement element; forming combined observation equations by the obtained error equations of the original measurement element, and carrying out integrated calculation on the combined observation equations according to the least squares criterion so as to obtain a vector value taking a Hermite fitting function coefficient and a measurement element system error model coefficient as to-b-estimated parameters; inserting the obtained vector value of the to-be-estimated parameters into the Hermite fitting function and the measurement element system error model, so as to obtain a target track coordinate parameter value, a speed parameter value and a measurement element system error value. The invention provides a Hermite function constraint-based data fusion calculation method. By adopting the method, the structure of the mathematical model is simplified when the estimation accuracy, the calculation stability and the calculation efficiency of the target track parameter are ensured.