136 results about "Reverse transformation" patented technology

Provided in the present invention is an interference-factor-based high-safety and stable control method for an onboard magnetically suspended flywheel battery system. The method comprises: in the case of a safe operating condition interference, obtaining the difference between a displacement reference signal and an actual displacement signal, and inputting the difference into a Butterworth-filter-fused fuzzy active disturbance rejection control module, so as to obtain control currents, wherein the control currents comprise a radial control current, a torsion control current and an axial control current; the radial control current and the torsion control current are subjected to Clark inverse transformation, and the axial control current is subjected to power amplification, and the three currents are then compensated for, such that a three-phase control current of a radial coil, a three-phase control current of a torsion coil, and a control current of an axial coil are obtained; the control currents control the corresponding coils, and are also input into a multi-information extended Kalman filtering prediction module, such that the actual displacement signal is output; and in the case of a dangerous operating condition interference, cutting off an output signal from an operating condition recognition and safety determination module. The present invention can improve the stability, robustness and anti-interference capability of a system.

The invention discloses a multi-dimensional aeroelastic calculation method and device based on a nonlinear Euler-Bernoulli beam and a storage medium, and belongs to the technical field of wind turbine aerodynamics, the method comprises the following steps: inputting the stiffness of each section of a blade into a nonlinear Euler-Bernoulli beam equation to obtain a modal-displacement transformation matrix; the rigidity, the weight and the external force of each section of the blade are converted to obtain a generalized rigidity matrix, a generalized mass matrix and a generalized force; starting circulation, substituting into a forced coupling vibration equation, solving modal displacement of each order at the current moment, and inputting into a modal-displacement inverse transformation matrix to obtain blade displacement; the generalized force is substituted into a blade element momentum theoretical formula to solve aerodynamic force at the next moment, the generalized force is updated to obtain updated generalized force, and aerodynamic force at each moment is obtained; and calculating to obtain the multi-dimensional aerobomb. According to the method, the calculation of the blade deformation and the load considers the change of the torsional degree of freedom, and more accurate and more efficient load and deformation calculation can be carried out.

The invention discloses an anti-quantum-attack national secret SSL communication system and method, and belongs to the technical field of information security. The quantum attack resistant national secret SSL communication system of the scheme comprises a traditional SSL client, an anti-quantum SSL client agent and a mixed SSL server. A traditional SSL client does not support an anti-quantum cryptography algorithm, and a mixed SSL server has a traditional cryptography technology and an anti-quantum cryptography technology at the same time. And the anti-quantum SSL client agent performs anti-quantum cryptographic algorithm transformation on a message sent by the traditional SSL client and then sends the message to the mixed SSL server, and performs anti-quantum cryptographic algorithm inverse transformation on a message sent by the mixed SSL server and then sends the message to the traditional SSL client. According to the scheme, the quantum attack resistance of the system is improved in a manner of incrementally deploying the anti-quantum SSL client agent at the SSL client, the transformation period is short, and the transformation cost is low.

The invention discloses a method and device for accelerating a homomorphic encryption algorithm by using fast number theory transformation and a medium. The method comprises the following steps: initializing homomorphic encryption parameters and generating a public key, a private key and a relinearization key; encrypting a plaintext to be operated by using the public key to generate a corresponding ciphertext polynomial; performing fast number theory transformation on the ciphertext polynomial to transform the ciphertext polynomial into a point value form; performing homomorphic multiplication on the two point value form ciphertexts to obtain three ciphertexts; using a relinearization key to transform and decompose one ciphertext by using a fast number theory and accumulate the decomposed ciphertext into the other two ciphertexts to obtain two similar primary ciphertexts; using fast number theory inverse transformation to transform the first-order ciphertext from a point value form into a polynomial form; and decrypting the ciphertext polynomial by using the private key to obtain a plaintext multiplication result. The method adopts fast number theory transformation and inverse transformation, improves the polynomial multiplication calculation efficiency through the processes of primitive root sampling, bit inverse sequence and the like, is suitable for the field of polynomial operation, and improves the polynomial operation efficiency.

The invention discloses a mixed mode anti-attack method and system based on a laser radar point cloud. The method comprises the following steps: acquiring an original point cloud; sequentially performing frequency domain transformation, disturbance and inverse transformation processing on the original point cloud to generate a disturbance point cloud; generating an initial antagonistic point cloud based on the disturbance point cloud; optimizing the initial antagonistic point cloud to obtain first antagonistic disturbance, wherein the first antagonistic disturbance comprises the following steps: constructing a target function based on a Hausdorff distance and a chamfering distance between the antagonistic point cloud and the original point cloud; obtaining a first antagonistic disturbance by minimizing the objective function, including: calculating gradient information in the current iteration; the step length is adjusted according to gradient information in the current iteration, the antagonistic disturbance in the next round of iteration is determined, and the first antagonistic disturbance is output after iteration is conducted for the preset number of times; and processing the original point cloud and the first adversarial disturbance based on shape prior guidance to generate an optimal adversarial point cloud so as to carry out adversarial attack. According to the method, the attack resisting effect and robustness are improved.

Embodiments of the present specification provide methods of storing or reading twiddle factors in a target transformation. The target transform is a discrete transform or an inverse transform thereof that transforms an input coefficient sequence into an output coefficient sequence based on a twiddle factor. The method comprises the following steps: determining a target twiddle factor to be stored, wherein the power of the target twiddle factor is a result of a product modular target value of a first factor of a first digit and a second factor of a second digit; the target twiddle factor is stored in a two-stage storage mode, and the two-stage storage mode comprises the steps that the target twiddle factor is stored at a first address in a twiddle factor storage device, and the twiddle factor storage device comprises a first number of first storage units, the first number is the number of different modular multiplication results generated by the factor of the first digit and the factor of the second digit; storing an index value directed to the first address at a second address in an index memory, where the index memory includes a target number of second memory cells, the second address corresponding to a power of the target twiddle factor; the target value is greater than the first number.

The present disclosure relates to a reverse-time migration method for marine vertical cable seismic (VCS) survey data and provides a reverse-time migration apparatus and method for vertical cable seismic (VCS) survey data using directional propagation of receiver wavefields, configured to perform equation-of-motion-based transform and inverse-transform processing on observed pressure wavefields during back-propagation of receiver wavefields to solve the problem of reflection boundary screening due to long-wavelength artifacts and avoid up / down wavefield separation to thereby simplify a migration process and improve overall quality of migration images.

The invention discloses a reverse shift catalyst capable of inhibiting methanation side reaction under the process condition of higher pressure and a preparation method of the reverse shift catalyst, the catalyst comprises the following effective component: iron accounting for 40-80% (weight percentage) of the total amount of the catalyst in terms of Fe2O3, an auxiliary agent for inhibiting methanation side reaction is added, and the preparation method of the catalyst is a mixing and kneading method. According to the present invention, the auxiliary agent for inhibiting the methanation side reaction is added under the reverse transformation process condition, such that the methane generation amount of the catalyst under the reverse transformation high pressure process condition is significantly reduced, the selectivity of the CO2 reverse transformation reaction is improved, the hydrogen consumption is reduced, and the new requirement of the national green dual-carbon development is met.

An apparatus for producing glass includes: a recuperator heating a heat transfer medium through heat exchange with a combustion gas emitted from a glass melting furnace; a reactor causing a reverse shift reaction to progress by heating CO2 gas and H2 gas through heat exchange with the heat transfer medium heated by the recuperator and producing at least CO gas from the CO2 gas and the H2 gas; and a burner forming a flame inside the glass melting furnace by burning a flammable gas containing the CO gas produced by the reactor and a oxidizing gas.

The invention discloses a small signal stability analysis method and system for a large-scale new energy power system, and relates to the technical field of power system stability analysis, and the method comprises the steps: constructing a discrete state space model of the whole power system for the large-scale new energy power system, and determining a discrete state matrix; converting a characteristic value of a system state matrix expected to be solved into a system dominant characteristic value by utilizing a preprocessing technology; the preprocessing technology is displacement inverse transformation or rotation transformation; based on the discrete state matrix, calculating and solving a system dominant characteristic value by using an iterative algorithm in combination with sparse implementation; converting the solved dominant characteristic value of the system into a characteristic value of a continuous state matrix, judging the small signal interference stability of the power system according to the converted characteristic value, and comparing the converted characteristic value with a distribution diagram of all the characteristic values of the system for verification. According to the method, the problems of difficulty in solving discrete space state matrix eigenvalues and low calculation efficiency are solved.

A method for preparing stainless steel micro-wires and foils with high strength, toughness, elasticity and stability, comprising the following steps: 1) preparing wires or strips; 2) reverse transformation annealing; 3) surface treatment; 4) stabilization treatment; 5) cold working. According to the method of the present invention, the cold-worked wires or strips are subjected to reverse transformation annealing and then cold-worked again to obtain ultrafine-grained martensite + ultrafine-grained reverse transformation austenite + residual austenite, so that the strength of the material is greater than 1900MPa, and the material has high strength and toughness; and the holding temperature of the reverse transformation annealing treatment is not greater than 850°C, and the energy consumption is low.

Provided in the present application are a quantum circuit construction method and apparatus, and a device, a storage medium and a product. The method comprises: preparing, on the basis of a modulus N, a first quantum register that comprises 2n first quantum bits and a second quantum register that comprises n first quantum bits, n being the binary expansion length of the modulus N; obtaining an equal-probability quantum superposition state of the first quantum register by constructing a Hadamard gate; constructing a first modular multiplication module and 2n-1 second modular multiplication modules on the second quantum register; sequentially using a plurality of first quantum bits as control bits, sequentially using the first modular multiplication module and the 2n-1 second modular multiplication modules as controlled parties, and constructing 2n controlled unitary gates; and performing inverse Fourier transformation and measurement on the first quantum register to obtain a phase estimation result corresponding to a modular function period r. The solution of the present application provides support for solving the problem of larger-scale computation.

The invention relates to the technical field of information security, in particular to a lightweight encryption and decryption method, which comprises the following steps: acquiring a continuous binary data stream of a sensor and segmenting the continuous binary data stream into fixed-length groups; calling a pre-generated round key sequence and a whitening key, wherein the round key sequence is generated through master key shift operation and round constant iteration; performing XOR operation on the grouped data and the whitening key to output initial confusion data; segmenting the initial confusion data into four equal-length sub-segments to execute multiple rounds of iterative processing, wherein each round comprises 16-bit modular addition operation and fixed-bit cyclic shift; xOR is carried out on the shifted data and a current round key, a sub-segment state is updated according to a preset branch processing rule, and linear transformation is carried out on the updated state by adopting a self-inverse matrix; the last-round output sub-segments are spliced into a ciphertext to be transmitted to an execution mechanism; during decryption, reversely calling the round key sequence, and multiplexing the self-inverse matrix to execute inverse transformation and reverse operation to recover original data. The problem of high encryption delay of industrial control equipment is solved.

The invention discloses a finite sample spectral data enhancement and physiological and biochemical component inversion method based on a de-noising diffusion probability model, which comprises the following steps: collecting leaf spectral data of a plurality of plant samples, measuring leaf nitrogen content, and constructing a leaf spectrum-nitrogen content data set; the spectrum-nitrogen content data of the leaves are input into a denoising diffusion probability model for data enhancement, original data distribution is degraded into analyzable distribution by gradually adding Gaussian noise in a forward diffusion process, noise distribution is inversely transformed into target data distribution by utilizing a learnable Markov chain in a reverse denoising process, and the target data distribution is subjected to data enhancement. Reconstruction of synthetic data from a random sample with known distribution is realized; combining the original data with the synthetic data to construct an extended training set; and training a regression model for inverting the physiological and biochemical components of the plant by using the extended training set. According to the method, the synthetic samples highly similar to real sample distribution can be generated, and richer data support is provided for a regression model, so that the prediction performance is enhanced.

Techniques for conducting an air flow simulation for a wind turbine include importing a file containing a digitized representation of a three-dimensional blade geometry, extracting from the file, blade constructive parameters, and calculating a low-order air flow past a wind-turbine that includes the blade, based on a Blade Element Momentum Theory (BEMT) to determine sectional angle of attack and free-stream velocity, boundary layer transition, and acoustic noise results. The techniques also include performing air flow simulation for a given number of blade sections, and generating virtual microphone rings. The process also includes computing noise spectra at the virtual microphone rings and blending the noise spectra generated and generating synthetic noise signals from each section by inverse Fourier transform of the noise spectra and converting the noise spectra into an audio track.

The invention provides a calculation method and system for a two-dimensional foundation pit unsteady-state seepage field under suspension type retaining wall supporting, and belongs to the technical field of computer aided design. Dividing a seepage field around the foundation pit into three regular areas according to the boundary condition when the boundary state is zero when seepage does not occur; sequentially carrying out Laplace transformation, Fourier transformation and inverse transformation on the time variables in the unsteady-state seepage equilibrium equation and the boundary condition of each region to obtain an expression of a water head series solution of a water head of each region; constructing a non-homogeneous equation set by utilizing continuous conditions among the regions; programming solving is carried out by utilizing orthogonality of a trigonometric function, and obtained constant terms are substituted into expressions of water head series solutions of all the areas; and carrying out inverse transformation on the solved expression by adopting a Stehfest method to obtain an expression of the unsteady-state seepage field water head solution of the foundation pit. The seepage field analytic solution calculated by the method has high precision, and the dynamic change characteristic of the seepage field around the foundation pit along with time can be accurately determined.

The invention discloses an RGB-D video encryption and decryption method based on a hyper-chaos technology and octlet fractional order Hartley transformation, and the encryption method comprises the following steps: S1, constructing a two-dimensional hyper-chaos system ICCHM based on ICMIC chaos mapping and Chebyshev chaos mapping, and generating a random matrix and a random sequence required by encryption by using the two-dimensional hyper-chaos system ICCHM; s2, defining octlet fractional order Hartley transformation and inverse transformation of the octlet fractional order Hartley transformation; and S3, carrying out RGB-D video encryption processing. According to the method disclosed by the invention, integral encryption of RGB-D is realized, two types of data with difference can be processed at the same time, and relatively high video encryption efficiency, relatively large key space and relatively high security are achieved; in addition, the encryption key management and transmission of the method are very convenient, and common cryptographic attacks can be effectively resisted.

The invention discloses a wave power generation and energy storage method based on a superconducting cable and an optimization controller. The method comprises the following steps: firstly, acquiring deviation between wave power generation power and power grid demand, and inputting the deviation to a TID controller after Laplace transformation; the core of the method is that an ant colony optimization algorithm is adopted to dynamically optimize a tilt term coefficient, an integral term coefficient and a differential term coefficient of a TID controller, a parameter space is discretized into candidate nodes, an ant colony probability optimization and pheromone updating mechanism is simulated, time weighted absolute error integral is taken as a fitness function, and an optimal control parameter combination is iteratively searched; based on the optimization result, the TID controller generates a master control signal, and after inverse transformation and physical constraint, the superconducting cable energy storage system is driven to rapidly charge and discharge, so that high-precision and self-adaptive stabilization of wave energy power fluctuation is realized. Intelligent parameter optimization and superconducting energy storage are combined, and the control performance, the response speed and the overall energy efficiency of the system are remarkably improved.

The invention discloses a transaction data generation method and device. The method comprises the following steps: randomly generating polynomial distribution noise and Levy distribution noise; based on a Levy distribution reverse denoising model, reverse denoising is carried out on Levy distribution noise, standardized inverse transformation is carried out on first data obtained through reverse denoising, and Levy distribution transaction data is generated; and based on the polynomial distribution reverse denoising model, performing reverse denoising on the polynomial distribution noise, and performing one-hot coding inverse transformation on second data obtained by reverse denoising to generate polynomial distribution transaction data. According to the Levy distribution reverse denoising model, a Levy distribution function which better conforms to financial data long-tail distribution characteristics is adopted to model numeric type, date type and time type data, samples which better conform to real data distribution are generated, and the actual availability of synthetic data is improved. Therefore, the accurate transaction data generation method is realized.

Disclosed herein is a video decoding method including: obtaining a transform skip mode flag indicating whether or not a transform skip mode is applied to a current block; based on the transform skip mode flag, when a transform skip mode is applied to the current block, determining that secondary transform / inverse transform is not applied to the current block; and, according to the transform skip mode flag, when a transform skip mode is not applied to the current block, obtaining a transform matrix index for secondary transform / inverse transform of the current block and, according to the transform matrix index, determining whether or not secondary transform / inverse transform is applied to the current block.

The invention discloses martensite structure genetic effect-based ultrahigh strength and plasticity advanced high-strength steel and a preparation method thereof, and belongs to the technical field of metal materials. The advanced high-strength steel comprises the following chemical components: C, Mn, Si, Al, Nb, Ti, Fe and the like, and the core of the advanced high-strength steel is that a microstructure is regulated and controlled through the'structure genetic effect 'of martensite: full martensite formed by pre-quenching is used as an initial structure, and reverse transformed austenite is preferentially nucleated on a martensite lath interface through critical zone annealing and inherits the lath form of the martensite lath; the double-peak retained austenite with battens as the main part (the volume fraction is larger than or equal to 70%) and blocks as the auxiliary part (the volume fraction is smaller than or equal to 30%) is finally obtained, the Mn element of the batten retained austenite is obviously enriched, the mass fraction of the Mn element is larger than or equal to 3.5%, the tensile strength of the finally-obtained advanced high-strength steel reaches 840-900 MPa, the ductility is 35-40%, the product of strength and ductility is larger than or equal to 31.5 Pa%, and the tensile strength is larger than or equal to 31.5 Pa%. The method is suitable for the fields of automobile lightweight, high-end equipment manufacturing and the like with strict requirements on material performance.

The utility model discloses a magnetic field orientation control device, and relates to the technical field of motor control. The magnetic field directional control device comprises a Clarke conversion module which is used for being connected with a sampling device so as to obtain three-phase current of a motor; a Park conversion module and a closed-loop adjustment module; the Park inverse transformation module is used for being connected with an SVPWM driver, so that the SVPWM driver drives a motor through a three-phase inverter according to a first control signal output by the Park inverse transformation module; and the switching circuit is configured to selectively establish connection between every two of the Clarke conversion module, the Park conversion module, the closed-loop regulation module and the Park inverse conversion module. According to the device, the FOC algorithm is modularized, and the modules are selectively connected through the switching circuit, so that free combination of the modules can be realized, multi-scene flexible application is realized, and more requirements of users are met.

Disclosed herein is a video decoding method including: obtaining a transform skip mode flag indicating whether or not a transform skip mode is applied to a current block; based on the transform skip mode flag, when a transform skip mode is applied to the current block, determining that secondary transform / inverse transform is not applied to the current block; and, according to the transform skip mode flag, when a transform skip mode is not applied to the current block, obtaining a transform matrix index for secondary transform / inverse transform of the current block and, according to the transform matrix index, determining whether or not secondary transform / inverse transform is applied to the current block.

A method and apparatus for performing transformation and inverse transformation on a current block by using multi-core transform kernels in video encoding and decoding processes. A video decoding method may include obtaining, from a bitstream, multi-core transformation information indicating whether multi-core transformation kernels are to be used according to a size of a current block; obtaining horizontal transform kernel information and vertical transform kernel information from the bitstream when the multi-core transformation kernels are used according to the multi-core transformation information; determining a horizontal transform kernel for the current block according to the horizontal transform kernel information; determining a vertical transform kernel for the current block according to the vertical transform kernel information; and performing inverse transformation on the current block by using the horizontal transform kernel and the vertical transform kernel.

The present application discloses a method for repairing non-45° bevels in an integrated circuit physical layout into 45° bevels, comprising: segmenting each closed figure to determine the longest continuous bevel chain connecting each vertex; performing affine transformation on the original coordinates of each vertex on each longest continuous bevel chain to obtain the affine transformed coordinates of each vertex; determining the effective range of movement of each vertex based on the affine transformed coordinates between different vertices; determining the candidate adjusted coordinates of each vertex based on the effective range of movement of each vertex; performing back-calculation on the candidate adjusted coordinates of all vertices in sequence along a second direction to obtain the effective adjusted coordinates of each vertex; performing inverse transformation on the effective adjusted coordinates of all vertices to obtain the repaired vertex coordinates of each vertex, so as to repair the non-45° bevels on each longest continuous bevel chain into 45° bevels.

According to the manufacturing method, the using method and the application system of the lock bolt, ingredients of alloy components in a preset proportion are smelted, and an alloy ingot is obtained; the alloy ingot is subjected to homogenizing annealing and rolled into a first alloy bar; the first alloy bar is subjected to tensile deformation, so that the first alloy bar is transformed from austenite to martensite, and a second alloy bar is obtained; processing the second alloy bar into a bolt, combining the bolt with a nut to form a thread pair, mounting the manufactured thread pair on preset use equipment, and performing ultrasonic impact on the bolt in the thread pair, so that the bolt reverses from martensite to austenite and generates recovery stress to be self-locked with the nut. The shape memory effect of the bolt can be achieved without a heating process in the use process, and the use reliability of the bolt in the service process is improved.

The invention provides a method for realizing reversible conversion between a lower boundary variable and an unbounded variable in water transportation and a related product. The method comprises the following steps of: valuing the lower bounded variable; converting the lower bounded variable into an unbounded variable; mathematical transformation of bounded variables and unbounded variables is proved to be reversible; proving that the first-order derivative at the forward transformation segmentation point is continuous; and proving that the first-order derivative at the inverse transformation segmentation point is continuous. The method has the beneficial effect that the bounded variable of the water transportation lower boundary is successfully converted into the unbounded variable. The conversion can meet the requirements of a part of mathematical assimilation methods and mathematical models for unbounded variables in the water transportation information processing and water transportation variable simulation and prediction processes. According to the method, the basic hypothesis of the peripheral nested algorithm is not damaged, the continuity of the algorithm is ensured, and the introduction of new errors is prevented. From the theoretical level, the assimilation precision of the peripheral nested data and the correction precision of the model correction model are higher, and the algorithm is more stable.

The present invention relates to an AES algorithm implementation method under a quantum storage-restricted environment, which optimizes the quantization implementation of the AES algorithm under a quantum storage-restricted environment from two perspectives: local and overall; locally, the nonlinear S-box transformation and its inverse transformation are optimized for the two situations of whether the output quantum bit is 0; overall, the recursion between the AES round states is realized with 160 quantum bits through a "sawtooth" round state update algorithm; for key expansion, the corresponding circuit is tailored for each round to realize the refined use of quantum bits, thereby realizing the entire process of the AES algorithm with as few quantum bits as possible. The method is conducive to saving the use of quantum bits.

The application discloses a kind of based on dual three-dimensional memory hyperchaos SCMA-OFDM transmission system, the system includes sending end and receiving end, the user of sending end possesses respective codebook, J user shares K subcarrier, initial bit information and after the calculation of hyperchaos model of memristor triangle mapping chaotic codebook enter SCMA encoder and carry out codebook mapping processing, obtain encrypted SCMA-OFDM signal, for carrier synchronization, it is inserted pilot, after pilot, obtain frequency domain signal and information data using fast inverse fourier transform after the calculation of hyperchaos model of memristor triangle mapping, frequency domain signal is changed into time domain signal;Then to time domain signal is increased cyclic prefix CP and cyclic suffix CS to eliminate intercarrier interference, then parallel-serial conversion parallel signal is changed into serial signal, finally through up-conversion DUC complex signal mixing becomes real signal into transmission channel.The transmission system of regular hexagon chaotic codebook, its performance is improved by 2.5dB than traditional codebook.

The present application discloses a method and system for implementing SACM-compliant safety case creation in SysML v2. The method includes: separately creating an EMF-based SACM safety case model and a SysML v2 safety case model that comply with the SACM standard; separately executing verification rules on external files referenced by the EMF-based SACM safety case model and the SysML v2 safety case model; separately executing forward transformation and reverse transformation on the EMF-based SACM safety case model and the SysML v2 safety case model after executing the verification rules on the referenced external files. Using the solution of the present application, it is possible to verify whether the referenced external files meet the defined security constraints, thereby enhancing the credibility and reliability of the entire safety case. At the same time, by separately executing forward transformation and reverse transformation between the EMF-based SACM safety case model and the SysML v2 safety case model, lossless bidirectional migration of the safety case model between the SysML v2 platform and the EMF platform can be achieved, ensuring the consistency of model semantics.