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31results about How to "Dig" patented technology

Monitoring method based on image features and LLTSA algorithm for tool wear state

ActiveCN107378641ARealization of wear status monitoringFully automatedMeasurement/indication equipmentsTime–frequency analysisTool wear
The invention relates to a monitoring method based on image features and an LLTSA algorithm for a tool wear state. According to the method, an image texture feature extraction technology is introduced into the field of tool wear fault diagnosis, and monitoring for the tool wear state is realized in combination with three flows of ' signal denoising', 'feature extraction and optimization' and 'mode recognition'. The method comprises the steps of firstly, acquiring an acoustic emission signal in a tool cutting process through an acoustic emission sensor, and carrying out signal denoising processing through an EEMD diagnosis; secondly, carrying out time-frequency analysis on a denoising signal through S transformation, converting a time-frequency image to a contour gray-level map, extracting image texture features through a gray-level co-occurrence matrix diagnosis, and then further carrying out dimensionality reduction and optimization on an extracted feature vector through a scatter matrix and the LLTSA algorithm to obtain a fusion feature vector; and finally training a discrete hidden Markov model of the tool wear state through the fusion feature vector, and establishing a classifier, thereby realizing automatic monitoring and recognition for the tool wear state.
Owner:NORTHEAST DIANLI UNIVERSITY

Transformer substation clustering method considering both voltage sag monitoring information and associated factor thereof

ActiveCN104915681AReduce reliance on expert experienceReduce workloadCharacter and pattern recognitionMachine learningRegional power
The invention discloses a transformer substation clustering method considering both voltage sag monitoring information and associated factors thereof. The transformer substation clustering method comprises the steps of establishing a voltage sag event monitoring information index and an associated factor index thereof; inputting voltage sag characteristic index data of a regional power grid transformer substation to be analyzed and carrying out normalization processing on the data; adopting a fuzzy C-means clustering method, clustering the regional power grid transformer substation to be analyzed respectively according to three voltage sag characteristic indexes to obtain clustering results in three dimensions; selecting a key index, adopting the fuzzy C-means clustering method, and clustering the regional power grid transformer substation to be analyzed according to the key index to obtain a comprehensive clustering result; and analyzing voltage sag characteristics of transformer substations of various categories by taking the comprehensive clustering result of the transformer substation as principle and combining the clustering results in three dimensions, and giving a preliminary voltage sag governance suggestion. The transformer substation clustering method provided by the invention has the advantages of comprehensive index setting, good classification effect, rich extracted information and the like.
Owner:SOUTH CHINA UNIV OF TECH

Image Hash code training model algorithm and classification learning method based on binary weight

The invention discloses a Hash code image training model based on binary weight, and a model algorithm comprises the steps: selecting a loss function, determining a target equation, and performing binary coding of a classifier and training image features; performing unified learning of a binary code, updating the binary code, and optimizing the loss function; and deducing the Hash code training model. The invention also discloses a classification learning method employing the Hash code image training model based on binary weight, and the method comprises the steps: obtaining a Hash code of a to-be-searched image through the Hash code training model based on binary weight, and solving Hamming distances between the Hash code and a classifier binary code; searching in the minimum Hamming distance from the Hamming distances, and obtaining the classifier corresponding to the minimum Hamming distance, wherein the classifier is the category to which the to-be-searched image belongs. The method can be used for the image classification for various types of images in high-latitude scenes, improves the performance of an algorithm in a large-scale data set, is precise, efficient and quick, andis small in consumption of the memory.
Owner:CHENGDU KOALA URAN TECH CO LTD

A multi-keyword expansion retrieval method based on a ciphertext

The invention discloses a multi-keyword expansion retrieval method based on a ciphertext. The method comprises steps of extracting a keyword set from the data source; constructing an inverse documentvector set based on the keyword set and grouping the inverse document vector set; carrying out B + index tree construction on each vector set, carrying out encryption through a security KNN algorithm,then encrypting a data source through a symmetric encryption algorithm, uploading the encrypted index tree sets and the data source to a cloud server, carrying out fuzzy processing on retrieval keywords input by a user, and carrying out correction according to the situation of input errors of the user; And finally, carrying out semantic analysis operation on the fuzzy query keyword set, expandingthe query keyword set, generating a query vector according to the keyword set subjected to semantic analysis, carrying out grouping processing on the trap door by utilizing the trap door obtained after the processing of an encryption algorithm, and uploading the trap door to a cloud server. From the perspective of trap door expansion, fuzzy processing and semantic analysis are carried out on theretrieval keywords input by the user, and the use experience of the user is improved.
Owner:NANJING UNIV OF POSTS & TELECOMM

Method for evaluating extreme coherent gust amplitude of wind direction change, and wind direction change value

The invention discloses a method for evaluating an extreme coherent gust amplitude of wind direction change, and a wind direction change value. The problems of unit life shortening and tower collapse accidents due to inaccurate evaluation of fan load in the prior art are solved, and the method comprises the following steps of acquiring a long-term wind measurement data sample of a site, identifying wind speed and wind direction data by using a GAI judgment function; determining a gust event meeting requirements in the site sample data, and fitting a calculation relation between a probability function and a theoretical probability through a sample gust amplitude actually measured; obtaining an extreme coherent gust amplitude of site direction change, and conducting Dir function fitting on an average wind speed value and a direction change value of the site gust event; and determining the extreme coherent gust direction change value of the site wind direction change. The method is high in practicability and relatively easy to operate, deeper mining on wind resource evaluation data is performed, and the method is an optimal method which accords with the actual situation of extreme coherent gust of which the direction changes once a site encounters within fifty years.
Owner:ZHEJIANG WINDEY

Substation clustering method considering voltage sag monitoring information and its associated factors

The invention discloses a substation clustering method that takes into account voltage sag monitoring information and associated factors, including establishing voltage sag event monitoring information indicators and associated factor indicators; inputting voltage sag characteristic index data of power grid substations in areas to be analyzed , and carry out normalization processing; using the fuzzy C-means clustering method, clustering the substations of the power grid in the area to be analyzed according to the three voltage sag characteristic indicators respectively, and obtaining the clustering results in three dimensions; selecting key indicators, using fuzzy The C-means clustering method, according to the key indicators, clusters the substations of the power grid in the area to be analyzed to obtain a comprehensive clustering result; mainly based on the comprehensive clustering results of the substations, combined with the clustering results of three dimensions, the voltage sag of each category of substations is analyzed characteristics, and give preliminary suggestions for voltage sag control. The clustering method of the invention has the advantages of comprehensive index setting, good classification effect, rich extracted information and the like.
Owner:SOUTH CHINA UNIV OF TECH

Root cause positioning method and device, storage medium and electronic equipment

The invention relates to the field of computer processing, in particular to a root cause positioning method, a root cause positioning device, a storage medium and electronic equipment. The root cause positioning method comprises the following steps: when service abnormality detection is performed based on calling index data of a called service device in a device calling pair to obtain a result of service abnormality, obtaining service abnormality detection information; performing dependency anomaly detection based on dependency index data of dependency equipment corresponding to the abnormal service equipment in the service anomaly detection information to obtain dependency anomaly detection information; constructing an exception attribute graph according to the service exception detection information and the dependency exception detection information; and when a plurality of abnormal service devices exist, calculating a root cause score of each abnormal service device by using the abnormal attribute graph, and sorting based on the root cause score of each abnormal service device to obtain a service device root cause sorting result. According to the root cause positioning method provided by the invention, fault root cause positioning of the equipment in the system can be accurately and quickly carried out.
Owner:JD DIGITS HAIYI INFORMATION TECHNOLOGY CO LTD
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