128 results about "Functional expression" patented technology

The invention provides a photovoltaic VSG control method based on virtual inertia and damping, and the method comprises the steps: designing a topological structure of a photovoltaic virtual synchronous generator for modeling, and obtaining a power and power angle equation of the virtual synchronous generator; constructing a function expression of the active power of the virtual synchronous generator and combining the function expression with a power and power angle equation of the virtual synchronous generator to obtain a second-order transfer function so as to obtain a step response curve of the output power and the angular frequency of the virtual synchronous generator; secondly, analyzing an influence mechanism of changes of virtual inertia and damping on the dynamic performance of the virtual synchronous generator based on a step response curve, obtaining self-adaptive principles of the virtual inertia and damping in different states based on the influence mechanism to construct a self-adaptive function, and finally setting parameters in the self-adaptive function and designing a starting criterion. Therefore, the photovoltaic virtual synchronous generator can be controlled. Compared with the prior art, the fluctuation of power and frequency can be better suppressed, and the stability of the system is improved.

The invention discloses a low-orbit constellation measurement and control resource scheduling scheme based on an improved genetic algorithm, and the scheme comprises the steps: firstly building a model through satellite simulation software STK, obtaining resource data, building a scheduling distribution model, converting measurement and control resources and measurement and control tasks into a mathematical form, and carrying out the measurement and control of the low-orbit constellation, thereby achieving the high-dimensional and multi-constraint problems of the measurement and control of the low-orbit constellation. A profit value is specified for each measurement and control task, an arc section is used as a measurement and control main body according to constraint conditions, a function expression for evaluating the advantages and disadvantages of a scheme is specified, finally, an improved genetic algorithm is applied, improved binary coding is adopted, the measurement and control arc section is used as a gene unit, a tournament selection mechanism is utilized, and data preprocessing and multiple constraint judgment correction are carried out. And solving an optimal scheme. The scheme can efficiently process complex scheduling, reduce invalid search and improve algorithm efficiency and scheme feasibility, meets actual operation requirements, and is suitable for scenes such as commercial satellite measurement and control.

The invention relates to the field of information security, in particular to a vulnerability reachability analysis and detection system based on a calling link JavaScr ipt component, and the system comprises an acquisition module which is used for acquiring a plurality of risk files from a project source code; the construction module is used for constructing an AST syntax tree according to a calling function of a code line in any risk file; the link generation module accesses the AST syntax tree through a traversal technology, obtains a function expression, obtains function calling information based on the function expression so as to construct a basic function calling link, and sequentially identifies and expands the basic function calling link into a multi-level function calling link according to the hierarchical structure of the basic function calling link; and the vulnerability detection module is used for querying by utilizing the vulnerability link rule and the multi-level function calling link, determining that the vulnerability is reachable if a vulnerability calling link fragment is queried, collecting the vulnerability and generating a vulnerability report. And the accuracy of vulnerability detection is improved.

The present application discloses a program compilation method and device, including: obtaining a first expression and a second expression of a program, the first expression and the second expression generating a dependency relationship based on a first variable, and the operation type of the first variable in the first expression is different from the operation type of the first variable in the second expression; updating the operation type of the first variable in the first expression and / or the operation type of the first variable in the second expression, the updated operation type of the first variable indicating that the first variable has no differential result or the result is zero after encountering a differential operation; processing the first expression and the second expression respectively according to the updated operation type of the first variable to obtain corresponding derivative function expressions; combining the derivative function expressions corresponding to the first expression and the second expression respectively based on the chain rule to obtain the compilation result of the program. By implementing the present application, the compilation result of the program can be simplified and the running performance of the compiled program can be improved.

The invention discloses a calculation method for a local axis of a spatial curved surface reticulated shell structural member, and the calculation method comprises the following steps: 1, obtaining a function of a spatial curved surface S, z = S (x, y); 2, for a component on the spatial curved surface reticulated shell, a starting point Pi and an end point Pj of the component are both located on a spatial curved surface S; 3, calculating the normal vector of the spatial curved surface S at the point Pi through a numerical method; and 4, averaging the normal vector of the spatial curved surface S at the starting point Pi position of the component and the normal vector of the spatial curved surface S at the end point Pj position of the component to obtain Vm. The spatial curved surface is an elementary spatial curved surface which can be expressed by an explicit function. A pure mathematical method is used for calculating the local axis of the spatial curved surface reticulated shell structural component, calculation is carried out through spatial analytic geometry, the local axis rotation angle, the local axial vector and the local axis plane of the component can be output, and the method is suitable for various local axis adjusting modes.

The invention relates to the technical field of microbiology, in particular to a biological reagent research and development method based on microbial functional gene screening. The method comprises the following steps: acquiring a microorganism sample, and performing genome sequencing extraction treatment and gene transcription analysis to generate transcriptome data of the microorganism sample; obtaining a biological reagent research and development target function, and performing target function gene screening treatment and gene targeted knockout treatment to generate a target function gene targeted knockout experimental group; carrying out gene cloning on the target functional gene targeted knockout experimental group, transferring into a preset host strain, carrying out function expression evaluation analysis to obtain a target functional expression level corresponding to each target functional targeted knockout gene, and carrying out excellent function screening and verification to generate a biological reagent excellent function verification gene, and the method is applied to a research and development process corresponding to a biological reagent so as to generate a target functional biological reagent product. The functional screening efficiency and the specificity of biological reagent products can be improved.

The invention relates to the technical field of machine manufacturing and machining, and discloses a CFRP machining hole wall three-dimensional roughness prediction method, which comprises the following steps: firstly, establishing a cutting force-cutting height equation through a cutting force equation to obtain a function relationship between a load and a surface height; according to the method, a function expression for predicting the three-dimensional roughness of the hole wall is obtained, then coefficients in the function expression are determined through an orthogonal cutting test, a complete calculation expression for predicting the three-dimensional roughness of the hole wall is finally obtained, and the three-dimensional roughness of the hole wall in the machining process can be predicted in real time only by monitoring a force signal or other signals capable of being converted into the force signal based on the expression. And therefore, real-time monitoring of the drilling quality in the machining process is achieved, machining damage is avoided, and the machining efficiency is improved.

The invention relates to a rotational inertia high-precision measuring method and measuring device, and belongs to the technical field of inertia measurement. According to the scheme, a magnetic grid sensor is used for reading a displacement change signal generated by torsional pendulum motion of a to-be-measured disc; identifying the wave crests of the displacement change signals to obtain a wave crest point moment sequence, intercepting sampling subinterval data in a set sampling interval before and after each wave crest point moment, carrying out curve fitting on the sampling subinterval data to obtain function expressions, taking first-order derivatives about time from all the function expressions, and calculating the first-order derivatives of all the function expressions; calculating an accurate wave crest time point when the first-order derivative is zero in the corresponding sampling subinterval; and substituting each accurate wave crest time point into the corresponding function expression to obtain a wave crest point amplitude sequence, and calculating a torsional pendulum period value for calculating the rotational inertia of the torsional pendulum motion according to a time difference between two adjacent wave crests in the wave crest point amplitude sequence. The problem that the position repeated triggering precision of a position sensor or a photoelectric coupler is low is solved, and high-precision measurement of the rotational inertia is achieved.

The invention provides a physical knowledge constrained intelligent aerodynamic prediction model modeling method. The physical knowledge constrained intelligent aerodynamic prediction model modeling method comprises the following five steps: (1) acquiring aerodynamic physical knowledge through data mining; (2) obtaining a function expression of aerodynamic force; (3) approximately replacing a function expression of aerodynamic force by adopting a depth operator neural network; (4) training a depth operator neural network; and (5) carrying out full-profile aerodynamic modeling based on the trained depth operator neural network.

The application discloses a Zanthoxylum bungeanum protein characteristic data-driven modeling method and system for functional expression, belongs to the technical field of food protein data modeling, obtains protein characteristic indexes, functional expression indexes and impurity interference indexes of Zanthoxylum bungeanum protein samples under different processing conditions, forms corresponding data and carries out standardization and abnormal data processing; based on the correlation degree of the protein characteristic indexes, the functional expression indexes and the impurity interference indexes, functional contribution factors and impurity domination factors are determined respectively, and comprehensive weights are generated; the protein characteristic data is weighted by using the comprehensive weights to obtain function-oriented protein characteristic data; then principal component extraction is carried out, and function-oriented principal components are screened according to the correlation between the principal components and the functional expression data and the impurity interference data; finally, a Zanthoxylum bungeanum protein functional expression prediction model is established; the application can weaken the influence of interference information such as pigments, turbidity, residual oil rate and non-protein particles on modeling, and improve the functional prediction stability.

The present invention discloses a topology optimization method and system for precise microstructure filling. The method includes two aspects: a synthetic microstructure interpolation method based on an initial microstructure and an update method for the unit filling microstructure during the optimization process. The synthetic microstructure based on the initial microstructure interpolates the implicit function expressions of different microstructures to obtain the implicit function expression of the synthetic microstructure, and a corresponding synthetic microstructure geometric model can be established. The update method for the unit filling microstructure during the optimization process combines the distribution of different initial microstructure filling domains within the unit with the synthetic microstructure interpolation method to obtain the microstructure of each unit, and updates are performed in each iteration to clarify the filling microstructure of each unit after each iteration. The geometric configuration of the optimization result of the present invention is clear, without intermediate density units and unclear unit filling microstructures, and has good manufacturability.

To allow a user to easily know how to respond in a case where a graph of an input function formula is not displayed.SOLUTION: An electronic device (10, 20) includes a control unit (13, 22) configured to, when a graph of a function formula including at least one variable is drawn and displayed on a display unit (12, 21) in response to an input of a numerical value corresponding to a drawing range of the graph to a variable of the function formula, display, on the display unit, a guide screen (P141) including a plurality of options for displaying the drawn graph within the display unit, in response to determining that the whole graph in the drawing range passes outside a display range designated in advance on the display unit.SELECTED DRAWING: Figure 7

The application discloses a method for improving the functional expression level of DgePPK2, and first constructs a recombinant expression vector containing a codon-optimized DgePPK2 coding gene; the chaperone-assisted expression vector is selected from at least one of pGro7, pG-KJE8, pTF16 and pKJE7, the chaperone-assisted expression vector and the DgePPK2 recombinant expression vector are sequentially transformed into an E. coli host cell, a recombinant engineering strain is obtained, and chaperone and DgePPK2 protein are co-expressed. The application effectively improves the soluble expression level of DgePPK2 by introducing a chaperone-assisted expression system, so that the crude enzyme obtained under the same culture condition has higher ATP regeneration capacity. The application can be applied to in-vitro enzyme catalytic reaction, multi-enzyme cascade reaction and related biological manufacturing processes requiring continuous supply of ATP, and has good application value.

The present application is a kind of geotechnical particle contact creep deformation discrete element numerical simulation method, the method is used to simulate long time contact creep between coarse particles, respectively determine four parameters in burgers model of normal coarse particle contact creep and tangential coarse particle contact creep;Obtain the corresponding four parameters under all different normal loads, the corresponding four parameters under all different normal loads and different tangential loads, respectively function fitting with load as independent variable and parameter as dependent variable, respectively obtain the function expression of eight parameters and load, and embed burgers model in PFC3D software;When the input normal load and tangential load are determined, the parameters in burgers model can be dynamically adjusted, and then the particle contact creep displacement under any load condition and time can be obtained. Break through the limitation of laboratory test, realize the quantitative prediction of rheological deformation of coarse aggregate in actual engineering.

The invention provides a multi-port system self-adaptive macro modeling method based on a Roca matrix and vector fitting, and the method comprises the following steps: obtaining S parameters of a multi-port system under each frequency point, and selecting an initial frequency point and a corresponding S parameter matrix; after the frequency is converted to an S domain, initial vector fitting is carried out based on a Loa matrix, and a system initial rational function expression is generated; adopting a dichotomy for interpolation in the frequency band with the maximum change of the rational function, inserting a new frequency point in the midpoint of the frequency band, and carrying out the next vector fitting based on the Roca matrix; and quantizing the sum of the port errors of each frequency band by using Gaussian integral, sorting according to the size, carrying out dichotomy interpolation again in the frequency band with the larger error, and iteratively executing the process until the fitting result reaches the convergence condition, thereby finally obtaining the macro modeling of the multi-port system. On the basis of the interpolation method and the Rocner vector fitting algorithm, the calculation memory requirement is remarkably reduced and the solving efficiency is improved while the solving precision is ensured.

This invention provides an FPGA-accelerated database query method, apparatus, device, and medium, comprising: inputting a query SQL into a row parsing module in the FPGA hardware core to obtain a first data stream; inputting the first data stream into a filtering module to obtain a second data stream; inputting the second data stream into a calculation module to obtain a third data stream; and inputting the third data stream into a projection output module to obtain a target data table. The row parsing module is used to split the data table into column data based on the configuration corresponding to the query SQL and put it into the stream; the filtering module is used to execute the filtering condition clause corresponding to the query SQL on the input data stream; the calculation module is used to execute the function expression calculation corresponding to the query SQL on the input data stream; and the projection output module is used to encapsulate the input data stream into row data. This invention aims to improve the versatility of FPGA-accelerated database SQL queries.

The invention discloses a spatial geometric model display method and system based on advanced mathematics, which can realize full-automatic and high-fidelity conversion from an original function expression to a three-dimensional rotating curved surface by constructing an advanced mathematics symbol analysis method. A dynamic sampling strategy based on a function change rate and a quaternion space rotation mechanism are adopted, and geometric accuracy and calculation stability of complex functions, especially piecewise functions and implicit functions under any rotation axis are guaranteed; real-time rendering and mathematical formula synchronous deduction are combined, an intuitive mapping relation from algebraic expression to spatial form is established, and the understanding depth of students on the rotating curved surface generation principle is remarkably enhanced; interactive operation and a multi-level teaching auxiliary function are introduced, the sense of participation and teaching applicability of the demonstration process are improved, the method is suitable for university mathematics public courses and engineering professional basic teaching scenes, and the structural defects of an existing visualization means in the aspects of semantic comprehension, adaptation flexibility and teaching fusion degree are effectively overcome.

The invention provides a database access method and system supporting unified authentication and business model mapping, and the method comprises the steps: uniformly converting a query request into a standard abstract syntax tree, and intercepting an identity certificate in the query request to construct a complete authority context object; mapping the permission context object into a temporary role name with the minimum required permission, and sending the temporary role name to a key management system to generate a temporary database connection voucher; the permission context object is received, and a specific RLS predicate character string and a CLS function expression are generated based on a preset RBAC strategy rule, an RLS constraint predicate template and a CLS constraint desensitization function template; based on the business model, mapping the standard abstract syntax tree to generate an initial logic query plan; and according to the RLS predicate character string and the CLS function expression, forcibly solidifying the security policy into the initial logic query plan to generate a target logic query plan. The technical problem that authentication and authorization mechanisms are separated in the prior art is solved.

The present invention relates to a method and system for warning a dynamic oil level of an aircraft, the method comprising: S1. combining the actual composition of each hydraulic source system of the aircraft hydraulic system, constructing a function expression of the oil level of the oil tank and the temperature of the oil tank; S2. constructing a low oil level warning condition; S3. combining the actual composition of each hydraulic source system of the aircraft hydraulic system, constructing a function expression of the oil level warning of the oil tank and the temperature of the oil tank; S4. detecting whether the oil level of the aircraft hydraulic oil tank is less than or equal to the warning value, if it is less than or equal to the warning value, then warning is issued, otherwise no warning is issued. The method determines a dynamic warning threshold by linking the warning threshold of the low oil level with the oil temperature and through a functional relationship, the threshold can improve the availability of the system and the attendance rate under the condition of ensuring the safety of the system.

Disclosed are methods, systems, and non-transitory computer-readable medium for context development. For instance, a first method may include obtaining first micro-application actor information associated with a first micro-application actor. The first micro-application actor information may include information for workflow rules, and the workflow rules may include data set rules, extract, transform, load (ETL) rules, and functional expressions. The first method may further include obtaining data from data sources based on the data set rules; applying the ETL rules to the obtained data to generate processed data; applying the functional expressions to the processed data to obtain an output; and performing at least one processing action based on the output. A second method may include generating a system component corresponding to a blueprint based on a user request; associating the system component with a domain of a user account; and performing processes associated the system component.

The invention provides a rice heat-resistant candidate gene screening method based on population inheritance and transcriptome integration, which comprises the following steps: acquiring a rice population, performing population differentiation analysis on the rice population, and screening out highly differentiated sites. And carrying out heterozygosity screening on the rice population to obtain a target SNP site. And taking a target SNP site which is obviously differentiated among the subgroups and is homozygous in the subgroups as a candidate SNP site. False positive signals caused by genetic background differences can be effectively eliminated through combined screening of genetic differentiation between subgroups and homozygosity in groups. And performing function annotation association on the candidate SNP sites, and performing transcriptome differential expression analysis on the rice population. And determining a final candidate gene according to the potential regulatory gene and the differential expression gene. Through collaborative analysis of population genetics and transcriptomics, genetic differentiation and functional expression are verified at the same time, the accuracy and reliability of candidate genes can be remarkably improved, and limitation of single-dimension screening is avoided.

This invention proposes an online correction method and system for sine and cosine signals of a rotary transformer, relating to the technical field of servo control. The method involves fitting the demodulated original sine and cosine signals using second-order polynomial functions to obtain second-order sine and cosine polynomial expressions, respectively. The term matrix and the parameter matrix to be optimized are then extracted to obtain the sine and cosine matrices. Based on these matrices, a sine and cosine correction error function is constructed. With the goal of minimizing the sine and cosine correction error function, the method uses the parameter matrix to perform online iterative solutions, thereby completing the online correction of the rotary transformer's sine and cosine signals. This method has low computational complexity and short processing time. Compared to directly decoding uncorrected sine and cosine signals, it improves the linearity of the subsequent decoding angle and reduces decoding speed fluctuations.

The invention provides an assembling mode of RNA liquid drops deformed through photostimulation and application of the RNA liquid drops, and belongs to the technical field of preparation of nucleic acid for analysis. The method comprises the following steps: mixing an RNA single strand with a buffer solution through structural design to obtain a mixed system with a specific concentration; after the mixed system is subjected to heat shock to complete base pairing and assembling, sealing and packaging are performed, the RNA liquid drops deformed through photostimulation are obtained, and the diameter of the liquid drops is 7.0-13.0 microns. The RNA liquid drop obtained in the embodiment can deform under light stimulation, behavior regulation and control can be achieved through group modification, and feasibility is provided for construction and functional expression of artificial cells.

The present invention relates to an innovative design inspiration motivation method based on patent semantic network concept combination generation, comprising the following steps: limiting a patent set used to construct a patent semantic memory network according to target functional verbs of design requirements, constructing a main function expression template for patent texts according to the expression form of the main functions in the patents; extracting main functional verbs from selected patent data based on the main functional expression templates; acquiring a target functional patent text set based on a semantic dictionary: after determining the main functional verbs of each patent, acquiring target functional patents used to construct a semantic memory network according to the semantic similarity between the main functional verbs of the patents and the target functional verbs, and forming a target functional patent text set; constructing a patent semantic memory network based on semantic computing; and inspiring inspiration of long-distance concept combinations.

The invention relates to the technical field of turbine blade design, and particularly discloses a turbine blade parameterization design and modeling method and system and a storage medium, and the method comprises the steps: determining a quantitative parameter value corresponding to each quantitative structure parameter of a turbine two-dimensional blade type and a plurality of variable parameter values corresponding to each variable structure parameter, generating a first blade profile function expression corresponding to each group of parameter values; wherein any group of parameter values comprises a quantitative parameter value corresponding to each quantitative structure parameter and any variable parameter value corresponding to each variable structure parameter; screening and determining a target blade profile function expression from all the first blade profile function expressions; and according to the target blade profile function expression, a target turbine three-dimensional blade model is constructed. According to the method, turbine blade parameters can be optimized, turbine blade types with better hydraulic performance parameters under the same size requirement are designed, three-dimensional model establishment is completed, and the design quality and efficiency are improved.

The application discloses a water adding flow calculation method for a moisture regaining machine. The moisture regaining machine is provided with a motor, a rotating shaft and helical blades. The motor is used to drive the rotating shaft and the helical blades to rotate in the moisture regaining machine, so as to transport materials from the inlet of the moisture regaining machine to the outlet of the moisture regaining machine. The calculation method comprises the following steps: obtaining an outlet moisture content target value, an inlet moisture content measured value and an inlet flow measured value of the materials; calculating a water adding flow basic value according to the outlet moisture content target value, the inlet moisture content measured value, the inlet flow measured value and a first functional expression; obtaining a frequency of the motor and a steam pressure value in the moisture regaining machine; calculating a water adding flow adjustment value according to the frequency of the motor, the steam pressure value and a second functional expression; and calculating a total water adding flow according to the water adding flow basic value, the water adding flow adjustment value and a third functional expression. The water adding flow of the moisture regaining machine can be calculated according to the relevant parameters of the materials at the inlet of the moisture regaining machine. The application further discloses a computer readable storage medium.

The present invention discloses a method for predicting surface movement and deformation in a mining area based on a segmentation method, and relates to the technical field of surface movement and deformation prediction. The method of the present invention comprises: first, identifying the position information of the boundary of a goaf area in a mining area, obtaining the coordinate information of the boundary of the goaf area, and establishing a function expression of the boundary of the goaf area in a horizontal rectangular coordinate system according to the coordinate information; then, segmenting the goaf area according to whether the boundary of the goaf area can be represented by the same function expression as a standard; secondly, calculating each segment after segmentation using a formula to obtain the surface subsidence value generated by the segmented goaf area; superimposing the subsidence values ​​of the same surface position of all segmented goaf areas to obtain a complete surface subsidence value; finally, according to the relationship between other surface movement and deformation parameters and the surface subsidence value, obtaining other parameters of surface movement and deformation in the mining area. The present invention improves the efficiency and accuracy of the prediction of surface movement and deformation in the mining area.

The invention discloses a discrete heterogeneous multi-agent system grouping consistency control method based on a cooperation-competition relation. Belongs to the technical field of artificial intelligence control. The method comprises the following steps: 1, establishing a heterogeneous multi-agent system model composed of m second-order agents and n first-order agents; 2, establishing a communication topology of the heterogeneous multi-agent system; 3, establishing a cooperation-competition relation functional expression between the intelligent agents; 4, establishing a heterogeneous multi-agent system consistency controller based on a competition-cooperation relationship; and 5, applying the established controller to the established heterogeneous multi-agent system model to realize the consistency control of the heterogeneous multi-agent system based on the competition-cooperation relationship. According to the method, communication between heterogeneous multi-agent systems is carried out based on the competition-cooperation relationship between the agents, and under the condition that packet loss and the interaction strength between the agents are considered, sufficient conditions for ensuring the agent grouping consistency are obtained.

The present disclosure relates to a distributed dynamic performance improvement control method and device. The method comprises: establishing and generating an inductor current prediction model for a parallel Buck converter system model based on droop control; converting the inductor current prediction model into a linear function expression based on external disturbance and model uncertainty analysis; establishing a residual-based performance improvement controller, and solving it based on a gradient descent algorithm to improve distributed dynamic performance control. The present disclosure can address external disturbances and model uncertainty issues in the system, while also being plug-and-play and applicable to a wide range of applications.

The invention provides a method for establishing a nonlinear mathematical model of a hybrid direct-current power transmission system considering discontinuous characteristics and a related device. The method comprises the following steps: representing a dynamic process of discontinuous links in a main loop and a control loop of the hybrid direct-current power transmission system by utilizing a step function; performing continuous approximation on the step function by using a linear combination of hyperbolic tangent functions to obtain a function expression of continuous expression; modular nonlinear differential equations of a rectification side network, an inversion side network and an AC / DC side network are obtained, and discontinuous dynamic parts involved in the equations are correspondingly replaced by adopting a continuously expressed function expression; all the modules are interconnected according to the input and output relation, and a complete hybrid direct current power transmission system nonlinear mathematical model is obtained. According to the method, a step function and hyperbolic tangent function continuous approximation method is adopted, a nonlinear mathematical model of the hybrid direct current power transmission system capable of accurately reflecting discontinuous dynamic characteristics is established, and therefore the accuracy and practicability of system modeling are improved.