31results about How to "Guaranteed monotonicity" patented technology

A programmable gain amplifier with three stages uses fine steps, has a large gain range, and is monotonic. The first stage comprises several amplifiers, each including a resistive feedback loop. The feedback loop comprises a series of resistors, with each resistor acting as a tap. Since the number of resistors in the loop is unchanging, monotonicity and stability is guaranteed when resistance is increased using successive taps. A switch system connects two taps at a time to an interpolation stage. Each of these taps corresponds to a specific resistor level, and thus a gain level. The interpolation stage uses a plurality of current sources inside a feedback amplifier to control the interpolation, in order to provide fine gain steps.

A novel digital attenuator circuit and associated pre-power amplifier (PPA) that substantially increases the dynamic range of the amplifier. Increased dynamic range is achieved by placing a digital current attenuator circuit at the output of the pre-power amplifier so that the minimum possible current output of the transistor switch array of the PPA can be further attenuated. The attenuator functions to split the current between the load and the power supply VDD (i.e. AC ground) based on device ratio that is controlled digitally via an input power control word. The digital attenuator is constructed as a segmented digitally controlled matrix or cell array comprising at least a pass and bypass matrix or array. The pass matrix controls the amount of current output from the PPA while the bypass matrix controls the amount of current shorted to the AC ground (i.e. power supply). By varying the number of transistors on or off in each matrix, the power output of the PPA can be easily and accurately controlled.

The invention discloses a tumor prognosis prediction system based on a deep belief network. The system comprises a data collecting module, a data preprocessing module, a data learning prediction module and a prediction result display module, wherein the data collection module is used for collecting tumor information; the data preprocessing module is used for carrying out missing value processing and normalization processing on tumor original data; the data learning prediction module is used for carrying out deep learning and prediction modeling on the tumor data; and the prediction result display module is used for displaying a relative risk output by the data learning prediction module. A Gaussian restricted Boltzmann machine is used to keep the nonlinear characteristics of the data; according to the dimension of input data, the amount of output categories and the accuracy of a model, the deep belief network can be flexibly expanded; and in a model training process, no restriction and hypothesis is adopted, an influence way of a variable for the result and a mutual function among variables can be fully mined, the influence way of different factors for tumor prognosis can be comprehensively revealed, and tumor prognosis prediction accuracy is improved.

The invention relates to a detection restorative method of hydraulic valve jamming and chucking faults, which comprises a detection step, a judgment step and an execution step which are carried out through electric connection. The judgment step is that jamming and chucking membership degree judgment is given out through a fuzzy multi-criteria decision making theory method according to average value information of control signals output through the detection step, frequency of shimmy signals, peak-to-peak value and wave distortion. By means of the technical scheme, the detection restorative method can detect and judge the jamming and chucking faults of a slide valve plug in real time and repair the jamming and chucking faults caused by pollution and imbalance radial force by using supersonic vibration, and the detection restorative method is simple and convenient in method and low in cost.

The invention discloses a spacecraft-folding-unfolding-structural-health-monitoring-oriented sensor configuration optimization method. The method includes the steps that (1) the alternative sensor data number n is determined, and the final-configuration sensor number m and the sampled mode order N are determined; (2) a structural dynamics-characteristic-equation solving equation is established to obtain a modal matrix; (3) the position of a finite element node serves as an optimization variable d; (4) a fitness function f<1> (d) based on a Fisher information matrix is established; a fitness function f<2> (d) considering the sensor configuration distance uniformity and significant intervals is established; the f<1> (d) and the f<2> (d) are optimized respectively with function maximization as an optimized target, and an optimal fitness function value f<1><*> and a value (The value is defined in the description) are obtained respectively; (5) the f<1><*> and the value (The value is defined in the description) are used in cooperation with the putting reliability degree of sensors on corresponding nodes, and a last fitness function f<4> (d) is established, wherein the f<4> (d) is optimized with function maximization as an optimized target, an optimal fitness function value (The value is defined in the description) and a corresponding optimization variable value (The value is defined in the description) are obtained, and the optimization variable value (The value is defined in the description) is a final sensor configuration position.

The invention belongs to the technical field of side-scan sonar image processing, and in particular relates to a nonlinear enhancement method for side-scan sonar images. The present invention comprises the following steps: obtaining the original image from the original side-scan sonar data file, then sequentially performing gray scale normalization, neighborhood extremum suppression and Gaussian smoothing on the original image, and then calculating the low gray scale area for the smoothed image The maximum value, the minimum value of the high gray area and the middle gray area, and finally perform nonlinear correction on the above three areas respectively to obtain the enhanced image. Through the above steps, the present invention can realize the enhancement of effective signals and the suppression of invalid signals of the original side-scan sonar image quickly, effectively and at low cost, enhance the contrast of local features of the image, and maintain the monotony of the edge and gray distribution of the original image Sex, do not quote false edges, etc.

The present invention proposes a hydraulic valve debugging method, including the following steps: S1: Test the change of the magnetic field strength of the hydraulic valve electromagnetic coil and at least one working parameter among the pressure, flow and current parameters of the valve stem of the hydraulic valve, and report the test results Transmission to the controller; S2: According to the change of the magnetic field strength of the hydraulic valve solenoid coil, determine the travel direction of the valve stem and compare the parameters of the valve stem of the hydraulic valve with the preset threshold value; S3: Determine whether the valve stem is in normal working condition, and When an abnormality occurs, the debugging direction is determined, and the present invention can accurately and real-time perform fault judgment, and enter a corresponding debugging mode to solve the fault.

The invention relates to a control method and a device of a power converter of a resonance topological circuit, wherein the control method of the power converter of the topological circuit comprises the steps of regulating the frequency of the power converter and the combination of the duty ratio to ensure that the power converter has good monotonicity in the whole output range of the control device. The control device of the power converter of the resonance topological circuit comprises a control module, which is used for regulating the frequency of the power converter and the combination of the duty ratio to ensure that the power converter has good monotonicity in the whole output range of the control device. When being implemented, the method and the device of the invention can ensure the monotonicity of the power converter of the resonance topological circuit in the whole PWM work range.