36results about How to "Small amount of data" patented technology

The invention belongs to the technical field of rapid measurement of battery impedance, and relates to an on-line measurement method for lithium-ion battery EIS low-frequency band based on ladder waves, which includes determining the appropriate number of steps and current amplitudes of the ladder waves based on the electrochemical reaction characteristics of the lithium-ion battery and actual needs. ; Apply a ladder wave current in a suitable frequency range to the lithium-ion battery, and perform sinusoidal fitting on the sampled ladder wave current and response voltage to obtain the required low-frequency impedance value, and then form the low-frequency electrochemical impedance spectrum of the lithium-ion battery. , that is, low-band EIS. The low-frequency EIS online measurement method can accurately reflect the low-frequency impedance information of lithium-ion batteries; it has the effects of high accuracy of low-frequency EIS test results of lithium-ion batteries, easy engineering implementation, etc., and provides effective technical support for rapid battery health assessment and safety warning .

The invention discloses an electrocardiogram (ECG) signal based identity authentication method, including a registration link and an authentication link, wherein the registration link includes the following steps: pre-storing a negative sample, pre-processing an ECG signal that is used as the negative sample, collecting a user template ECG signal, detecting the location of R waves, intercepting QTwaves, generating sparse feature templates from the intercepted QT waves by using a differential dictionary learning algorithm for sparse representation, and then evaluating an optimal sparse featuretemplate, and searching an optimal threshold; the authentication link includes the following steps: generating sparse features by using the pre-processed ECG signal, and then performing preliminary authentication based on the optimal threshold, and completing the authentication based on maximum entropy voting; and if remote identity authentication is performed, the method also includes the step of compressing data and transmitting the data to a remote authentication unit before the preliminary authentication. The ECG signal based identity authentication method disclosed by the invention is particularly suitable for the application of real-time authentication of ECG identities in remote dynamic medical treatment, and solves the problem of efficient and real-time identity authentication.

The invention discloses a sliding window business data determination method and device and aims to solve problems that the quantity of acquisition-needing data is relatively large and system resource consumption is relatively large existing when a mode is employed to determine a statistics value of business data contained in a sliding window at a certain moment in the prior art. The method comprises steps that the statistics value of the business data contained in the sliding window at the first moment is acquired; a first statistics value of the business data in a first interval is acquired, and the first interval is a time interval between the first moment and a second moment; a second statistics value of the business data in a second interval is acquired, length of the second interval is not smaller than length of the first interval, and the second interval starts from the start moment of the first moment of the sliding window; a statistics value of the business data contained in the sliding window at the second moment is acquired according to the the statistics value of the business data contained in the sliding window at the first moment, the first statistics value and the second statistics value.

The invention discloses a CO that considers multiple factors 2 The invention discloses a method for establishing a corrosion prediction chart, belonging to the technical field of corrosion protection of oil and gas fields. The method includes: first, at different temperatures, CO 2 Under the partial pressure and chloride ion concentration, the corrosion weight loss test of steel was carried out in a high temperature autoclave to obtain the measured value of the corrosion rate; then the nonlinear fitting method was used to establish the relationship between the corrosion rate and temperature, CO 2 The functional relationship and relationship curve of partial pressure and chloride ion concentration; finally, the measured value of corrosion rate, functional relationship and relationship curve obtained above are combined to draw CO 2 Corrosion prediction chart. This method takes into account a variety of factors for CO 2 The impact of corrosion has high prediction accuracy and practicability, which provides a reference for preventing corrosion failure of metal facilities in oilfields, and provides a technical guarantee for the safe use of materials.