42 results about "Eigenfunction" patented technology

A method of catching systematic eigenfunctions and signal eigenvalues under the condition of only response output available belongs to the parametric recognition technique in dynamic test field. The technique is a method of adopting cross spectral density functions of each response point instead of frequency response functions to perform time-frequency filtering and the parametric recognition of frequency domain, and includes the following steps: (1) carrying out analytic calculation of the cross spectral density functions of different metering signal of output points; (2) analyzing and calculating the nonorthogonal wavelets in the time-frequency domain according to the cross spectral calculating result; (3) inversing the fourier transformation to gain the time-frequency analyse coefficient; (4) adding a rectangular window to perform the time-frequency filtering; (5) calculating the cross spectrum of the output signal after filtering as the systematic function for recognition; (6) performing curvefitting to obtain the systematic parameter; the technique improves the recognition precision of the systematic parameters, precisely recognizes modal parameters, is simple and convenient, and is suitable for the dynamic analyses, the performance verification and the failure diagnosis of large civil engineering establishments such as large and complex mechanical equipments under operation status, high-rise buildings, bridges, etc.

Non-invasive methods for detecting arterial disease in vivo include obtaining acoustic signals from a sensor held on an external body region proximate an artery. A complex frequency grid of frequencies and associated lifetimes of the obtained acoustic signals is generated. A predictive model of complex frequencies associated with peak-perturbation acoustic signals attributed to boundary perturbations in vivo that occur with early stage arterial disease is provided. A predictive model of complex frequencies associated with line-perturbation acoustic signals attributed to boundary perturbations in vivo that occur with later stage arterial disease and thickening of arterial junctions is also provided. It is determined whether peak and/or line-perturbation acoustic signals of the predictive models are present to detect whether the subject has arterial disease.

The present invention provides a calculation method of calculating, by a computer, a light intensity distribution formed on an image plane of a projection optical system, comprising a step of dividing an effective light source formed on a pupil plane of the projection optical system into a plurality of point sources, a step of shifting a pupil function describing a pupil of the projection optical system for each of the plurality of point sources in accordance with positions thereof, thereby generating a plurality of shifted pupil functions, a step of defining a matrix including the plurality of pupil functions, a step of performing singular value decomposition of the matrix, thereby calculating an eigenvalue and an eigenfunction, and a step of calculating the light intensity distribution, based on a distribution of the light diffracted by the pattern of the mask, and the eigenvalue and the eigenfunction.

A method includes performing an approximate partially coherent imaging operation for elements of a first basis generated from a model image having no noise and no blur, and generating based upon the first basis a second basis that is blurred, the approximate partially coherent imaging operation being expressed by a convolution integral on an eigenfunction corresponding to a maximum eigenvalue of a Kernel matrix and each element of the first basis, generating an intermediate image in which each pixel value of the observed image that has been denoised is replaced with its square root, and obtaining a restored image by approximating each of a plurality of patches that are set to entirely cover the intermediate image, using a linear combination of elements of the first basis and linear combination coefficients obtained when each patch is approximated by a linear combination of elements of the second basis.

A computer numerical processing method for representing audio information for use in conjunction with human hearing is described. The method comprises approximating an eigenfunction equation representing a model of human hearing, calculating the approximation to each of a plurality of eigenfunctions from at least one aspect of the eigenfunction equation, and storing the approximation to each of a plurality of eigenfunctions for use at a later time. The approximation to each of a plurality of eigenfunctions represents audio information. The model of human hearing includes a bandpass operation with a bandwidth having the frequency range of human hearing and a time-limiting operation approximating the time duration correlation window of human hearing.

A computer readable medium containing computer-executable instructions which cause a computer to execute processing steps that calculate a light intensity distribution formed on an image plane of a projection optical system. When executed, the medium causes a computer to execute the steps of dividing an effective light source into the plurality of areas, generating, for each of the plurality of areas, a plurality of shifted pupil functions by shifting a pupil function in accordance with a position of each of divided point sources, defining, for each of the plurality of areas, a matrix including the plurality of pupil functions, calculating, for each of the plurality of areas, eigenvalues and eigenfunctions by performing singular value decomposition of the matrix, and calculating, for each of the plurality of areas, the light intensity distribution based on a diffracted light distribution from the mask and the eigenvalues and the eigenfunctions.

The invention discloses an ultra-short-term wind power combination prediction method based on a support vector machine, and the method comprises the steps: firstly carrying out the linear interpolation replacement of to-be-processed wind power historical data according to the data of an adjacent time period, and carrying out the normalization of the preprocessed data; secondly, decomposing the processed wind power data into an eigenfunction sequence and a residual error sequence by using empirical mode decomposition; secondly, establishing a quantum particle swarm-support vector machine model for the eigenfunction sequence and the residual sequence obtained by decomposition, and performing training optimization to obtain a predicted value of each sequence; and finally, superposing the prediction values of the sequences to obtain a final wind power prediction value, and carrying out error evaluation analysis. Compared with a support vector machine direct prediction result or a result without data feature decomposition, the prediction result of the method is improved, and meanwhile the situation that local errors are too large does not occur. Compared with an existing wind power prediction scheme, the method is higher in robustness, higher in calculation speed, less in data requirement and better in prediction effectThe invention discloses an ultra-short-term wind power combination prediction method based on a support vector machine, and the method comprises the steps: carrying out the linear interpolation replacement of to-be-processed wind power historical data according to the data of an adjacent time period, and carrying out the normalization of the preprocessed data; secondly, decomposing the processed wind power data into a cost characteristic function sequence and a residual sequence by utilizing empirical mode decomposition; secondly, establishing a quantum particle swarm-residual sequence for the intrinsic function sequence and the residual sequence obtained by decomposition; carrying out training optimization on the support vector machine model to obtain a predicted value of each sequence; and finally, superposing the predicted values of the sequences to obtain a final wind power predicted value, and carrying out error evaluation analysis. Compared with a result of direct prediction of a support vector machine or no data feature decomposition, the prediction result of the method is improved, and meanwhile, the situation of overlarge local error does not occur. Compared with an existing wind power prediction scheme, the method is higher in robustness, higher in calculation speed, less in data demand and better in prediction effect.

Methods and systems are disclosed for compensating for image motion induced by a relative motion between an imaging platform and a scene. During an exposure period, frames of the scene may be captured respectively in multiple spectral bands, where one of the spectral bands has a lower light level than the first spectral band, and contemporaneous frames include a nearly identical induced image motion. Image eigenfunctions are utilized to estimate the induced image motion from the higher SNR spectral band, and compensate in each of the multiple bands.

The present invention enables calculation of a solution of a non-self-adjoint problem represented by simultaneous differential equations. An analysis device includes: a setting unit that sets an original differential operator of an analysis object and a boundary condition of variables; an adjoint boundary condition calculation unit that calculates an adjoint boundary condition from the boundary condition; and a non-self-adjoint calculation unit that calculates a primal differential operator and a dual differential operator from the original differential operator, and determines a primal eigenfunction and a dual eigenfunction by using primal simultaneous differential equations and dual simultaneous differential equations, as well as the boundary condition and the adjoint boundary condition, thereby calculating a solution of simultaneous differential equations.

Systems and methods are described for synthesis of total surface current vector maps by fitting normal modes to radar data. A method includes extracting a scalar data set from a radar signal from a radar. Velocity components are calculated from the radar signal. The velocity components are fitted to a set of scalar eigenfunctions and eigenvalues to simultaneously solve for the best set of normal modes and the corresponding set of constants. The corresponding set of constants represent a corresponding set of amplitudes. The set of constants and the set of normal modes are used to create a two dimensional vector field used in creating a total vector map.

The invention discloses a method for adjusting an influence matrix of accurate matching of seismic waves and a target response spectrum. The method comprises introducing an intrinsic function of a six-order differential equation to decompose initial seismic waves; obtaining initial amplitude coefficients in one-to-one correspondence with the intrinsic functions; in each time of iterative computation, calculating the response spectrum of the seismic wave reconstructed by the intrinsic function by using the Duhamel integral; calculating the contribution value of each intrinsic function to the reaction spectrum at each calculation frequency. The method has the advantages that the contribution of each intrinsic function to the calculation of the reaction spectrum can be adjusted by adjusting the amplitude coefficient of the intrinsic function, so that the calculation of the reaction spectrum is uniformly and consistently close to the standard reaction spectrum in each iteration calculation, and the purpose of matching the calculation of the reaction spectrum with the target design reaction spectrum is finally achieved. According to the method, the iteration process is monotonous and convergent, so that the time-history dynamic response analysis result of the important engineering structure has high precision and reliability, and the discreteness and the time consumption are remarkably reduced.

In a system for optimization of method for determining material properties when searching for materials having defined properties, comprising a computing unit with a processor and a device for presentation of data and calculation results, and with access to data on materials, and a testing unit carrying out tests on real materials and communicating with the computing unit, the computing unit having a module (60) for construction of a model of an ideal material, which comprises a module (64) for calculation of complete sets of pairs of the energy eigenvalues Eⁱ (i=1 . . . n) and eigenfunctions being linear combinations of basis vectors, and a module (68) for calculation of courses of temperature dependencies of free energy, internal energy, entropy, magnetic susceptibility, calculated for a field applied along (x and z) or (x, y and z) directions, and Schottky specific heat in order to determine the calorimetric, electron and magnetic properties of a material containing ions in the defined environment of the Crystal Electric Field (CEF).

The invention discloses a finite-dimension eigen frequency domain analysis method for an optical imaging system. The finite-dimension eigen frequency domain analysis method comprises the following steps: a first step: solving a two-dimensional light intensity transmission matrix of an optical system according to a PSF matrix and a one-dimensional object vector of the optical system; a second step: solving a characteristic value vector of the two-dimensional light intensity transmission matrix by using a QR decomposition method, and solving an eigen function vector group of the two-dimensional light intensity transmission matrix by using a power method; and a third step: solving object and image finite-dimension eigen spectral vectors by means of the object vector, an image vector and the eigen function vector group. The finite-dimension eigen frequency domain analysis method for the optical imaging system is used for overcoming the defects of the Fourier optical frequency-domain imaging analysis method in theory and numeral value calculation, providing the solving method of the object and image eigen spectral vectors and realizing that the object eigen spectral vector multiplying by the characteristic value vector of the optical imaging system is equal to the image eigen spectral vector.

The invention discloses an improved influence matrix method for high-low frequency band alternation and target spectrum matching, which comprises the following steps: all intrinsic functions are selected in a low frequency band and intrinsic functions of which the intrinsic frequencies are in one-to-one correspondence with frequency calculation points of a target spectrum in a high frequency bandas a group of primary functions to decompose seismic waves, so that the dimension of an influence matrix is greatly reduced; the influence of different frequency components on each other and the difference of contribution values to the target spectrum are considered, and the reaction spectrum is gradually close to the target design spectrum within the full frequency range by alternately adjustingthe amplitude coefficients of the full-band and high-band intrinsic functions, so that a very good matching effect can be achieved within the key attention frequency range of a project. The method overcomes the defects that in an existing response spectrum matching influence matrix method, the influence matrix dimension is large in the iteration process, the calculation efficiency is low, and different requirements of high frequency bands and low frequency bands cannot be met at the same time. Therefore, the dynamic time-history response analysis efficiency of the important engineering structure is greatly improved, and the precision and reliability are high.