38results about How to "Retain original features" patented technology

The present disclosure discloses a non-invasive blood glucose monitoring method, system, device, and medium based on PPG signals, including: collecting PPG signals to be monitored; filtering the PPG signals to be monitored to remove high-frequency components of the PPG signals to be monitored; filtering The processed PPG signal to be monitored removes the baseline drift; the PPG signal to be monitored after removing the baseline drift is segmented and divided into several single-period PPG signals to be monitored; each single-period PPG signal to be monitored Perform feature extraction to extract several signal features; input all the extracted signal features into a pre-trained classifier for classification and identification, and identify the blood glucose concentration label corresponding to the PPG signal to be monitored.

The invention discloses an abnormal message detection method, which includes: dividing the text of the detected message into multiple text segments; acquiring one or more account attributes of each text segment, and determining the corresponding The publishing ratio parameter of the account attribute; determine the first factor corresponding to each account attribute of each text segment according to the publishing ratio parameter; determine the second factor according to the first factor corresponding to each account attribute of each text segment; The second factor determines whether the detected message is an abnormal message. By using the Bayesian algorithm combined with the posting account attribute of the message and the undifferentiated text segmentation processing, the effective restriction on the microblog batch spam is realized, and the flexibility of spam processing is improved at the same time.

The invention relates to the technical field of antibacterial coatings, and discloses a sterilizing method for cold-spraying electrothermal coatings. The cold-spraying process is used to spray metal powder or ceramic-reinforced metal composite powder on the surface of a substrate to obtain an electrothermal coating with a thickness of 200-2000 μm; Apply a voltage below 8V to the electrothermal coating, and energize for 1 to 5 minutes to achieve sterilization. The invention realizes the rapid deposition of metal particles on the surface of the substrate through the cold spraying process, forming a layer of dense and conductive coating, without adding an antibacterial agent, and can realize rapid and efficient sterilization under the condition of low-voltage energization, effectively avoiding the Traditional coatings containing heavy metals can be applied to the surface of medical operating tables, the surface of infusion tables, and the surface protection of marine detection equipment against the pollution of the natural environment.

The present invention provides a kind of fuzzy clustering result visualization method based on Radviz, and its steps are: 1) carry out data preprocessing to the result of fuzzy clustering algorithm; 2) design reasonable clustering cluster dimension anchor point layout for RadViz circle; 3) Project the data samples into Radviz in dot mode or pie chart mode; 4) Expand the dimension anchor point into a dimension ring to realize the visual coding of the Radviz ring; 5) Integrate the membership degree distribution information into the main Radviz 6) Extract the coexistence relationship between clusters, and use the chord to map the coexistence relationship. Based on Radviz, the present invention displays the fuzzy membership matrix obtained by the fuzzy clustering algorithm, which not only provides users with as much fuzzy clustering information as possible, but also allows researchers to freely explore information such as data attributes, membership matrix, and cluster clusters , so that users can make more rapid, intuitive and accurate decisions.

The invention discloses an iron-nickel-based high-temperature self-lubricating hot-working die material which comprises an alloy matrix, a solid lubricant and a hard phase, wherein an ingredient of the alloy matrix is iron-nickel-based alloy powder, and the alloy matrix is prepared by taking a GH2135 ingredient as the standard; the solid lubricant is CaF2; the hard phase is Cr2O3; three phases ofpowder of the alloy matrix, the solid lubricant and the hard phase are uniformly mixed by a ball mill, and then a hot-working die is prepared by a powder metallurgy method. The iron-nickel-based high-temperature self-lubricating hot-working die disclosed by the invention can implement self-lubrication under the condition of no oil or little oil, and meanwhile, is low in production cost.

The invention discloses a self-adaptive denoising method for partial discharge signals on the basis of spectral kurtosis and S transformation. The self-adaptive denoising method comprises the following steps of: through a discrete signal rapid spectral-kurtosis diagram and S transformation time-frequency spectrum calculation, rapidly acquiring time-frequency characteristics of the partial discharge signals; by combination of the time-frequency characteristics of the partial discharge signals, optimizing value ranges of all parameters in a partial-discharge-signal matching atom dictionary in a self-adaptive manner; then finding atoms with maximum inner product with noised partial discharge signals as optimum matching atoms from the optimized results of the partial-discharge-signal matching atom dictionary by an MP (Matching Pursuit) algorithm; finally, on the basis of the optimum matching atoms obtained by all iterations, carrying out sparse representation on the original partial discharge pulse signals so as to achieve the purpose of denoising the partial discharge signals. The self-adaptive denoising method disclosed by the invention has the advantages that the accuracy of the denoising result is high, no waveform distortion is caused, no limitation on the number of measured local discharge pulses and the positions of the pulses is formed, and the application is wide.