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410results about How to "Accurate expression" patented technology

Method for predicting city traffic accidents based on time-space distribution characteristics

The invention relates to a method for predicting city traffic accidents based on time-space distribution characteristics. The method comprises: first, in combination of the case information and the space information, creating a case space database and performing pretreatment to the data; then, based on surface area statistics, analyzing the traffic accidents' time-space distribution characteristics; using the global and local self-correlation method to realize the analyzing of the aggregate state; based on the case happening point data, analyzing the traffic accidents' time-space distribution characteristics; through the hierarchical clustering analysis, expressing the distribution rule of the cases hierarchically; through the nuclear density estimation method, expressing the continuous changes and accurate gathering center of the traffic accidents' happening distribution; and finally, utilizing the BP neural network prediction algorithm, using the time-space distribution characteristics of the already happened cases to predict the time-space distribution areas of traffic accidents in the future. According to the invention, in combination with the time-space distribution and through the utilization of big date excavation BP neural network prediction algorithm and the time-space distribution characteristics of the already happened cases to predict the time-space distribution areas of traffic accidents in the future, it is possible to increase the precision, the timeliness and reduce the manual cost.
Owner:FUJIAN JIANGXIA UNIV

Hadoop-based k-means clustering analysis system and method of network security log

The invention provides a hadoop-based k-means clustering analysis system and method of a network security log. The hadoop-based k-means clustering analysis system comprises a log data acquisition subsystem, a log data mixing mechanism storage management subsystem and a log data analysis subsystem. The method includes the steps that in a data storage layer, a mixing storage mechanism with Hadoop cooperating with a traditional data warehouse is adopted to store log data, a Hive operation interface is provided in a data access layer, the data storage layer and a computing layer receive instructions from a Hive engine, and efficient query analysis on the data is achieved by being matched with MapReduce through HDFS; when mining analysis is conducted on log data, MapReduce is adopted to conduct clustering mining analysis on the network security log through a k-means algorithm; the framework with the Hadoop cooperating with the traditional data warehouse is adopted, the detects of the traditional data warehouse on the aspects of mass data processing, storage and the like, and meanwhile an original traditional data warehouse is fully used; clustering analysis is conducted through the MapReduce-based k-means algorithm, and safety grade evaluation and early warning can be conducted on log data timely.
Owner:NORTHWEST UNIV(CN)

Method for re-identifying persons on basis of deep learning encoding models

The invention relates to a method for re-identifying persons on the basis of deep learning encoding models. The method includes steps of firstly, encoding initial SIFT features in bottom-up modes by the aid of unsupervised RBM (restricted Boltzmann machine) networks to obtain visual dictionaries; secondly, carrying out supervised fine adjustment on integral network parameters in top-down modes; thirdly, carrying out supervised fine adjustment on the initial visual dictionaries by the aid of error back propagation and acquiring new image expression modes, namely, image deep learning representation vectors, of video images; fourthly, training linear SVM (support vector machine) classifiers by the aid of the image deep learning representation vectors so as to classify and identify pedestrians. The method has the advantages that the problems of poor effects and low robustness due to poor surveillance video quality and viewing angle and illumination difference of the traditional technologies for extracting features and the problem of high computational complexity of the traditional classifiers can be effectively solved by the aid of the method; the person target detection accuracy and the feature expression performance can be effectively improved, and the pedestrians in surveillance video can be efficiently identified.
Owner:张烜

Multi-view angle human face recognizing method based on non-linear tensor resolution and view angle manifold

The invention discloses a method for identifying multi-view human face based on nonlinear tensor resolution and view manifold, which comprises the following steps: normalizing the size of the multi-view human face; dividing multi-view human face images into a test set and a training set by adopting a method of leaving one out; arraying the human face images in the training set into a form of tensor along the direction of identity, view and pixel information change, resolving tensor data by using high-order singular values to obtain a coefficient matrix of identity, view and pixel factors of the human face images; using a data-concept driving mode to array and interpolate view coefficients to obtain the view manifold of human face; according to the rotating objective sequence of the human face, generating the view manifold through a concept driving mode; using the nonlinear tensor resolution to map the view manifold to a data space of the multi-view human face, obtaining a modular matrix of identity coefficient, and establishing a model of the multi-view human face; and adopting an iterative algorithm based on EM-like to solve a model parameter, and achieving identification by the parameter meeting the minimum reconstructed error criterion. The method has the advantages of high accuracy and high speed, and can be used for complex human face retrieval and identification under different view angles in the field of biological characteristic identification.
Owner:XIDIAN UNIV

Personalized search method for Web service recommendation

The invention discloses a personalized search method for Web service recommendation. The personalized search method comprises the following steps of: 1, preprocessing a WSDL (Web Services Description Language) file, i.e., forming a bag of words through two preprocessing steps of removing stop words and extracting stems; 2, extracting user interest, i.e., calculating weight of each word in the bag of words by using an improved TF-IDF (Term Frequency-Inverse Document Frequency) formula, and multiplying by a time decay factor of the word to obtain a new weight; selecting previous k words according to the weight from large to small as interest words of a user and corresponding weight of each word to form a k-dimension user interest vector; 3, calculating interest similarity, i.e., setting a similarity threshold and selecting the users with interest similarity exceeding the threshold as neighbor users of a target user; and 4, ordering service search results, calculating a recommended predicted value of the service according to similarity of neighbor users and the frequency of selecting service of the users, and arranging the searched results in a descending order according to the recommended predicted value, thereby obtaining the personalized search result.
Owner:十方健康管理(江苏)有限公司 +1

Text similarity calculation method and device, computer equipment and computer storage medium

The invention discloses a text similarity calculation method and device, and relates to the technical field of text processing, which can accurately calculate the similarity between texts in a text with complex expression. The method comprises the steps of obtaining training word segmentation corpora obtained after word segmentation is conducted on text corpora with different sentence lengths; inputting the training word segmentation corpora as training data into a supervision model for training, and constructing a sentence vector conversion model which is used for converting sentences in the text corpus into sentence vectors for representing text characteristics; adjusting characteristic parameters in the sentence vector conversion model according to the sentence vector which is obtained by training and represents the text characteristics; based on the adjusted sentence vector conversion model, performing sentence vector conversion on the plurality of target texts to obtain a plurality of sentence vectors representing the characteristics of the target texts; and calculating the similarity among the plurality of target texts according to the plurality of sentence vectors representing the characteristics of the target texts.
Owner:PING AN TECH (SHENZHEN) CO LTD
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