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99 results about "Multiple relation" patented technology

Text joins for data cleansing and integration in a relational database management system

An organization's data records are often noisy: because of transcription errors, incomplete information, and lack of standard formats for textual data. A fundamental task during data cleansing and integration is matching strings—perhaps across multiple relations—that refer to the same entity (e.g., organization name or address). Furthermore, it is desirable to perform this matching within an RDBMS, which is where the data is likely to reside. In this paper, We adapt the widely used and established cosine similarity metric from the information retrieval field to the relational database context in order to identify potential string matches across relations. We then use this similarity metric to characterize this key aspect of data cleansing and integration as a join between relations on textual attributes, where the similarity of matches exceeds a specified threshold. Computing an exact answer to the text join can be expensive. For query processing efficiency, we propose an approximate, sampling-based approach to the join problem that can be easily and efficiently executed in a standard, unmodified RDBMS. Therefore the present invention includes a system for string matching across multiple relations in a relational database management system comprising generating a set of strings from a set of characters, decomposing each string into a subset of tokens, establishing at least two relations within the strings, establishing a similarity threshold for the relations, sampling the at least two relations, correlating the relations for the similarity threshold and returning all of the tokens which meet the criteria of the similarity threshold.
Owner:AMERICAN TELEPHONE & TELEGRAPH CO +1

Multi-entity relationship joint extraction method and device based on text generation

PendingCN110196913ASolve extraction problemsJoint extraction implementationNatural language data processingSpecial data processing applicationsFeature extractionEntity relation extraction
The invention provides a multi-entity relationship joint extraction method and device based on text generation, wherein the method comprises the steps of expressing each word in a sentence to be processed through a coding vector, and obtaining a word embedding vector of each word; performing feature extraction on the word embedding vector of each word, and obtaining a high-grade feature representation vector of each word; and decoding the advanced feature representation vector, generating a target entity or a relational word at each moment to obtain a generation sequence, and generating the words generated at each three consecutive moments in the generation sequence to form an entity relationship triple. According to the method, an entity relationship extraction task is converted into a text generation task, the entity and the relation words are used as the target text to be generated, and one or more groups of relation triplets are generated, so that the joint extraction of the entityand the relation is achieved, the entity can repeatedly appear in the multiple triplets, and the entity overlapping and entity relation extraction problems under the multiple relations are solved.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Method for measuring impurity in high pure gold by plasma atomic emission spectrometer

The invention relates to a method for using a plasma atomic emission spectrometer to measure impurities in high-purity gold, which comprises the following steps: weighing one unit of sample in a bunsen beaker, adding aqua regia to dissolve, replenishing hydrochloric acid deionized water to do constant volume to a scale after dissolving, respectively getting sample solution in more than two colorimetric tubes, solution in each tube is 15ml, adding gold standard solution which is mixed by elements according to a multiple relation in turn, doing constant volume by deionized water, starting the plasma atomic emission spectrometer, starting a circulating water pump, opening analytic control software, entering a 'standard addition method' control procedure, choosing a spectral line for measuring in a spectral line base, setting the concentration value of curved lines, scanning a whole band, sucking sample solution in each colorimetric tube in an instrument in turn according to the sequence that the concentration is from low to high, clicking a feeler switch to get an initial curve point of the point after sucking in each time, assuring curved lines, and leading the linear coefficient to be more than 0.99, outputting the concentration value result of each determined element, and calculating the result of the percentage content of each determined element according to the calculating formula.
Owner:BEIJING INST OF NONFERROUS METALS & RARE EARTH

Method for detecting nonlinear oscillation during industrial process based on improved variational mode decomposition

The invention discloses a method for detecting a nonlinear oscillation during an industrial process based on improved variational mode decomposition. The method comprises the following steps: (1) collecting a set of loop output signals of a to-be-detected industrial process; (2) calculating a frequency spectrum and a phase correction signal mean frequency spectrum of the loop output signals to determine the mode number and the center frequency initial value; (3) setting the search range and the step size of a penalty coefficient; (4) calculating the sum permutation entropy obtained through a VMD decomposition corresponding to different penalty coefficients, and determining an optimal penalty coefficient; (5) performing the VMD decomposition adopting the determined mode number, the center frequency initial value and the penalty coefficient to select an effective mode; and (6) calculating whether a multiple relation exists between center frequencies of the effective mode, and judging whether a nonlinear oscillation exists or not. According to the method for detecting the nonlinear oscillation during the industrial process based on improved variational mode decomposition, the accuracyand the reliability of a nonlinear detection for the control loop of the industrial process can be improved, a data support is provided for performance evaluations and fault diagnoses, and a foundation is laid for a subsequent positioning work of multi-loop nonlinear oscillation sources.
Owner:ZHEJIANG UNIV

Testing method and testing system for nonlinear internal resonance representation of fiber composite boards

InactiveCN107870074ASatisfy the necessary conditions for the formation of internal resonanceAccurate natural frequencyVibration testingFiberCoordination theory
The invention discloses a testing method and a testing system for nonlinear internal resonance representation of fiber composite boards. The method includes selecting internal resonance inherent frequencies of two steps of a composite board, and pre-determining dimension parameters and material parameters, for forming internal resonance of the composite board, according to an integral-multiple coordination method; processing the composite board; testing the internal resonance inherent frequencies of the two steps of the composite board; judging whether the internal resonance inherent frequencies of the two steps are in integral-multiple relation or not, and if not, adjusting the clamping position of the composite plate slightly and retesting the internal resonance inherent frequencies of the two steps of the composite board to enable the internal resonance inherent frequencies of the two steps to have integral-multiple relation; performing internal resonance representation testing on the composite board under different stimulation conditions, analyzing vibration characteristics of nonlinear internal resonance, and concluding change rules of nonlinear vibration response. By the testing method, an integral-multiple coordination theory is provided to calculate the inherent frequency of the composite board, specific parameters of the composite board are determined, and accordingly,testing accuracy and efficiency are high.
Owner:NORTHEASTERN UNIV

Method for node placement of Internet of Things

The invention relates to a method for node placement of the Internet of things. The method comprises the steps of establishing a square basic monitoring area model, calculating the area of the basic monitoring area model and comparing the area of the basic monitoring area model with the area which actually needs to be monitored, establishing a novel square basic monitoring area model and calculating the area of the novel square basic monitoring area model, determining the multiple relation of the area of the novel square basic monitoring area and the area which actually needs to be monitored, determining the relations of the number of nodes of a total sensor, the distance of two adjacent sensor nodes on diagonal lines, a topological hierachy number, the number of cluster head nodes and the area which actually needs to be monitored, actually choosing and arranging a monitored area, choosing a topological structure which can represent the whole terrain configuration, configuring the dynamic-static combination routing mechanism of the whole monitoring area, and when the monitoring area needs to be expanded, the monitoring area is combined or a plurality of circles of basic monitoring areas is added on the outermost layer of the monitoring area. The method can be widely used for the node displacement of the Internet of Things.
Owner:NORTH CHINA INST OF SCI & TECH

Method for estimating amplitude of time-frequency overlapped signals

Disclosed is a method for estimating the amplitude of time-frequency overlapped signals. The method comprises the steps that S1, the four-order circulation cumulant of the received time-frequency overlapped signals is obtained, and a four-order circulation cumulant amplitude spectrogram is obtained; S2, when the symbol rates of all the signal components of the overlapped signals are different and integral multiple relations do not exist, the symbol rates of all the components are estimated according to a disperse spectrum line detection method; S3, according to the symbol rates of all the components obtained by estimation, the value of the four-order circulation cumulant at the symbol rates is obtained on a four-order circulation cumulant amplitude spectrogram; the amplitude values of all the components of the overlapped signals are estimated according to the symbol rates and the value of the four-order circulation cumulant of the symbol rates obtained in the step S2 and the step S3. The method can be used for estimating the amplitude of the signal components of the time-frequency overlapped signals, good estimation performance is achieved in a low SNR environment, and good robustness is achieved for the frequency spectrum overlapping ratio.
Owner:XIDIAN UNIV

Digital valve unit and combination and control method thereof

The invention discloses a digital valve unit and a combination and control method thereof. The digital valve unit comprises a valve block, multiple switch valves, an oil outlet pressure sensor, an oil inlet pressure sensor, a valve block oil inlet and a valve block oil outlet, and a digital valve combination unit is formed by connecting multiple digital valve units. All switch valve oil inlets are communicated with a lower layer oil channel inside the valve block, and all switch valve oil outlets are communicated with an upper layer oil channel inside the valve block. By means of the digital valve unit and the assembly and control method thereof, valve sets can be increased or decreased according to working conditions through quick-change connectors or bolted connection, control is more flexible to conduct, and more energy is saved. Through combination utilization of the switch valves with the multiple relation being that the valve port open area is multiplied by two, high-resolution output of needed flow and accurate control over the load backpressure are achieved. Through combination utilization of the high-speed switch valves, it is guaranteed that when a single cartridge valve is broken down, only the cartridge valve which is broken down needs to be replaced, it is not needed to replace the whole digital valve combination unit, therefore the maintenance cost and replacement cost are greatly lowered, and production cost is greatly lowered accordingly.
Owner:ZHEJIANG UNIV

Orthogonal grating phase shift method for three-dimensional surface shape measurement

ActiveCN104501741ANo low-intensity areasUsing optical meansPhase shiftedGrating
The invention discloses an orthogonal grating phase shift method. In the conventional orthogonal grating phase shift method, phase shift is generally required to be performed on stripes in two orthogonal directions (namely horizontal direction and vertical direction) respectively in order to demodulate phase information on the two orthogonal directions, so that respective phase distribution can be obtained with 2N (N is greater than or equal to 3) frames of images; when phase shift is performed by using a mechanical device, a two-dimensional translation mechanism is required to be adopted. According to the method, the phase shift is performed on an orthogonal grating according to a specific direction, so phase shift magnitudes of the stripe in the horizontal direction and the stipe in the vertical direction have integer multiple relation; thus synchronous phase shift of the stripes in the two orthogonal directions is realized, and the phase distribution of each direction can be calculated through N frames of phase shift images. According to the method, the phase shift of the stripes in the two orthogonal directions can be simultaneously performed; when the mechanical device is adopted, only the one-dimensional translation mechanism is required; the method is particularly suitable for a three-dimensional surface shape measurement system of the orthogonal grating.
Owner:SICHUAN UNIV

Automatic sock turning-over machine

An automatic sock turning-over machine belongs to the sock turning-over machine technology field. The automatic sock turning-over machine is formed by a feeding device, a sock sleeving apparatus and a sock turning-over apparatus, wherein the feeding device, the sock sleeving apparatus and the sock turning-over apparatus are arranged on a rack of the automatic sock turning-over machine. An overall length of a large synchronous belt and an overall length of a small synchronous belt on the sock sleeving apparatus form a multiple relation. A tail of a small synchronous belt wheel is contacted with a center portion of a belt of the large synchronous belt. A front end opens a certain field angle. Socks are entered into through a sock pasting hook on a large belt from a tail of the large synchronous belt so that the socks are guaranteed to be continuously sent into the sock turning-over apparatus. The sock turning-over apparatus is provided with two sock conveyer belts. After a sock sleeving process is realized, a push rod is used to push one part of a sock head sleeve between a slit of the two sock conveyer belts. Under a friction effect of the sock conveyer belts and the socks, tails of the socks are turned into a casing pipe and then sock ports are entered into the casing pipe under a tail driving effect so that the socks are overturned. The structure is simple, continuity is good, and economic benefits are increased because of a mechanization operation.
Owner:ZHEJIANG UNIV OF TECH

Antenna based meta-material and method for generating working wavelengths of meta-material panel

The invention relates to an antenna based a meta-material and a method for generating working wavelengths of a meta-material panel. The antenna comprises a radiation source and a meta-material panel which has an electromagnetic wave gathering function and works at a first wavelength, wherein the meta-material panel is used for converting electromagnetic waves emitted by the radiation source into planar waves and running the antenna at a second wavelength and a third wavelength which are smaller than the first wavelength and are in different multiple relations with the first wavelength simultaneously. The invention further provides a method for generating a working wavelength of the meta-material panel of the antenna. The method comprises the following steps of: acquiring a numerical valuem3/m2 of the ratio lambda3/lambda2 of the third wavelength lambda3 to the second lambda2 in a preset error range; computing a minimum common multiple m1 of m2 and m3; and generating a working wavelength lambda1 of the meta-material panel, wherein lambda1=lambda2 (m1/m2) or lambda1=lambda3 (m1/m3). The working wavelength of the meta-material panel is designed, so that the antenna can work at different wavelengths simultaneously; and the electromagnetic waves of the radiation source are converted into planar waves, so that gathering performance is enhanced, and the volume and size of the antenna are reduced.
Owner:KUANG CHI INST OF ADVANCED TECH +1
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