101 results about "Threshold point" patented technology

A method for identifying and localizing a reentrant circuit isthmus in a heart of a subject during sinus rhythm, including: a) receiving electrogram signals from the heart during sinus rhythm via electrodes; b) storing the electrogram signals; c) creating a map based on the electrogram signals; d) finding a center reference activation location on the map; e) defining measurement vectors originating from the center reference activation location; f) selecting from the measurement vectors a primary axis vector indicating a location of the reentrant circuit isthmus in the heart; g) finding threshold points of electrogram signals on the map; h) connecting the threshold points to form a polygon indicating a shape of the reentrant circuit isthmus in the heart.

The invention discloses an automobile forward direction anticollision system signal processing method. In each frequency sweep cycle, the following processes which are performed on upper sweep frequency IQ data and lower sweep frequency IQ data of each channel comprise steps of performing fast Fourier transform FFT on N points of IQ data, performing adaptive threshold detection on transformed plural module value data after transmission, outputting an over-threshold point position, taking an interval between two points as a transformation interval, wherein one point is positioned before the threshold point position and the other one is positioned after the threshold point position, performing chirp-z transformation on M points, performing peak value searching on the data after chirp-z transformation, outputting a peak value point position, calculating a difference frequency and a phase according to the peak value point, outputting an object distance, relative radial speed and an azimuth according to the difference frequency and the phase output distance. The invention enables the system to respond fast through processing and optimizing the signal, is good in practicability and faster.

The present invention provides a warning envelope generating method for a civil aircraft terrain awareness and warning system. The method comprises: a step S1 of, according to the initial fight state of an aircraft, building a normal flight path model of no warning conditions, generating a no-warning normal flight path, meanwhile building a pilot evasive operation model, generating an evasive path of the aircraft after warning, comparing the two flight paths with first-order Markov random terrain data separately, and determining whether the warning in the flight simulation is successful; a step S2 of carrying out massive flight simulation, performing statistics on the false warning rate and the warning success rate as warning performance indexes of the system, creating an SOC curve, weighing the influence of the two indexes on the system, and selecting an optimum warning threshold point; and a step S3 of generating the whole warning envelope. According to the invention, the influences of false warnings and missed warnings on the warning system are taken into consideration, so that the warning envelope finally generated is reasonable, and the occurrence of false warnings and missed warnings is reduced.

An apparatus and method for controlling a clutch of a hybrid vehicle are provided. The method includes: setting, by a controller, a limited torque to a motor torque and comparing an input speed of the transmission and a minimum speed of the engine when converting from an EV driving mode to an HEV driving mode. The controller is configured to start the engine when the input speed of the transmission is equal to or greater than a minimum threshold point and is equal to or less than a minimum speed of the engine. Further, the method includes increasing the motor torque to exceed the preset limited torque, coupling the first clutch when the engine speed and a motor speed are synchronized, and coupling the second clutch when the input speed of the transmission exceeds the minimum speed of the engine by the controller.

Various torque-limiting screwdrivers, systems, and methods are disclosed. The screwdriver can include a body supporting a motor configured to rotate a screw engaged with the screwdriver. The screwdriver can include a controller configured to implement torque-limiting functionality, such as by monitoring the amount of torque applied to the screw and reducing or stopping rotation of the screw when certain torque-limiting criteria are met. Some embodiments include a threshold point, after which the torque-limiting functionality can be engaged. Some embodiments include a slowdown point, after which the rotational speed of the screw is reduced.

The invention discloses a lithium battery residual life prediction method, which comprises the following steps: acquiring the capacities of a plurality of charge-discharge cycles of a lithium battery,and normalizing the capacities; performing window division on the normalized capacitances to obtain a training data set; inputting the training data set into a degradation state model comprising a convolutional neural network and a long and short memory recurrent neural network for training; inputting the last window data of the training data set into a trained degradation state model for slidingprediction until the predicted capacitance reaches a capacity degradation threshold point; and predicting the remaining life of the to-be-tested lithium battery according to the sliding cycle numbercorresponding to the predicted capacity value. According to the method, the feature extraction capability of the convolutional neural network and the time sequence prediction capability of the long and short memory recurrent neural network are fused, the degradation features of the lithium battery are effectively extracted and predicted, and the prediction precision is improved. And the window size of the degradation index is automatically determined by using the false nearest neighbor method, so that the calculation efficiency is improved.

An improved dynamics processing control system clamps a level detected control signal at a level equal to a predefined threshold point. In one embodiment, a clamped level detected signal feeds a filter with very slow response characteristics. By comparing the difference between the input and the output of the system a differential control signal generated. The differential control signal is used to provide a continuously variable, program dependant output signal when the input signal drops below a threshold point. In another embodiment of the invention, both the attack and release times of the system are varied in response to a differential control signal.

The invention relates to a double-pointer instrument number reading method based on machine vision. The method comprises the following steps of acquiring a template picture and performing modeling, performing characteristic detection on a to-be-identified instrument picture, and acquiring target area positioning in the to-be-identified instrument picture by means of characteristic matching; intercepting a dial area graph from the target area; preprocessing the dial area graph, searching a reading number pointer area and eliminating a shadow; searching a reading number pointer line by means ofthe reading number pointer area; acquiring a threshold pointer image according to a pointer color characteristic which is stored in modeling; preprocessing the threshold pointer image, searching a threshold point area and eliminating the shadow; searching a threshold pointer line by means of the threshold point area; determining directions of two pointers by means of a projection method; and finishing number reading of two pointers by means of an angle method. According to the method of the invention, the target area can be accurately positioned on the condition of dial rotating and illumination changing; the method can be adapted with the conditions of pointer breaking and adhesion between the pointer and texts in the image; and furthermore the method is not interfered by the pointer shallow, thereby realizing relatively high accuracy and stability.

The invention discloses a method for accurately locating a fault point of an optical cable. The method includes the first step that the optical length Lb of an optical fiber of a fault point B is obtained; the second step that the length of the optical cable of a reference point A is 0.85*Lb-0.95*Lb; the third step that back scattering curve data D1 are obtained; the fourth step that back scattering curve data D2 are obtained; the fifth step that a data series D is obtained by subtracting D2 from D1, and the curve of D is represented by coordinates, wherein a Y-axis represents amplitude change of back scattering signals, and an X-axis represents the length of the optical fiber; the sixth step that displacement calculation is performed on the data series D, and the optical length of an optical fiber of a threshold point C is La; the seventh step that if the result subtracting La from Lb is smaller than 200m, A is the reference point, and if the result subtracting La from Lb is larger than 200m, the steps from the third step to the sixth step are repeated until the reference point A is found; the eighth step that the length Lc is obtained, and the actual position of the fault point can be obtained according to Lc and the final reference point A. The method has the advantages that the position of the fault point of the optical cable can be found quickly and accurately, the maintenance time is shortened, and work efficiency is improved. The invention further discloses a device for accurately locating the fault point of the optical cable.

In a converter-controller the controller includes a primary power device coupled to a primary coil and a resonant reset capacitor in parallel with the primary power device. The controller can switch the primary power device with a variable frequency. The resonant capacitor and the primary coil have a primary resonant cycle. The controller can turn on / off the primary power device for half of the primary resonant cycle. The controller includes a first secondary power device, having a first voltage and a second secondary power device, having a second voltage, each voltages having a rising threshold-point and a falling threshold-point. The first and second secondary power devices are coupled to the control logic and to corresponding terminals of the secondary coil. The controller can synchronize the rising threshold-point of the first voltage with the falling threshold-point of the second voltage or vice versa.

Various torque-limiting screwdrivers, systems, and methods are disclosed. The screwdriver can include a body supporting a motor configured to rotate a screw engaged with the screwdriver. The screwdriver can include a controller configured to implement torque-limiting functionality, such as by monitoring the amount of torque applied to the screw and reducing or stopping rotation of the screw when certain torque-limiting criteria are met. Some embodiments include a threshold point, after which the torque-limiting functionality can be engaged. Some embodiments include a slowdown point, after which the rotational speed of the screw is reduced.

The invention discloses an over-temperature protection circuit used for a high-side power switch. The over-temperature protection circuit concretely comprises a reference voltage generation module, a temperature detection module, an output control and shaping module, a positive feedback retardation module and a protection module. The reference voltage generation module generates a stable voltage independent of a temperature and a power supply voltage. The temperature detection module converts a temperature signal into a voltage signal. The output control and shaping module outputs an over-temperature control signal according to change of the detection signal. The positive feedback retardation module adjusts a temperature detection signal according to the over-temperature control signal and achieves temperature retardation. The over-temperature protection circuit can be used for a power integrated circuit of a high-side power switch or the like, and a thermal turn-off threshold point cannot change along with power supply change. In addition, the over-temperature protection circuit can be well compatible with different power switch circuits inputting control levels and is suitable for high-side power switch circuits inputting control levels with various amplitudes.

The invention discloses an over-charge voltage protection detection circuit and system. The over-charge voltage protection detection circuit comprises a detection module, a first switch module, a second switch module, a voltage dividing module, a comparison module and a reference generating module; the detection module controls the first switch module to be turned on and the second switch module to be turned off; the voltage dividing module is used for sampling an input voltage of a power input end and outputting a sampled voltage to the comparison module; the reference generating module outputs a reference voltage to the comparison module; when the sampled voltage is higher than the reference voltage, the comparison module outputs a first level signal to the detection module, and the detection module controls the input voltage to be reduced to a preset voltage; and when the sampled voltage is lower than the reference voltage, the comparison module outputs a second level signal to thedetection module, and the detection module controls the input voltage to be increased to the preset voltage. By stabilizing the input voltage at an over-charge voltage protection threshold point, accurate measurement on the over-charge voltage protection threshold point is achieved.

This invention relates to one memory radiation test method and its device, wherein, the device comprises radiation source, level conversion circuit, main control unit, and data input unit and system set and process unit. This invention method comprises the following steps: writing designed data on one memory device; then starting radiation source for memory intensity, set distance, set time; in testing process reading and writing data to the memory part according to read mode; real time comparing the memory part real time output value and predication value to judge whether its is right; once there is wrong data rightly recording its invalid information to find out threshold point of invalid of memory.

The embodiment of the invention discloses a gamma register calibration method, a gamma register calibration device and a display device. The gamma register calibration method comprises the steps of obtaining a first threshold point and a second threshold point by adjusting a register value of a gamma register; determining a linear prediction relational expression based on the first threshold pointand the second threshold point; obtaining a register prediction value under the target brightness value based on the linear prediction relational expression; correcting the register prediction valueby adjusting the register value of the gamma register to obtain a third threshold point; dividing the brightness sections corresponding to the first threshold point and the second threshold point intotwo new brightness sections by using the third threshold point; and taking one threshold point corresponding to the two end points of each new brightness section as a new first threshold point, taking the other threshold point as a new second threshold point, and returning to execute the step of determining the linear prediction relational expression based on the first threshold point and the second threshold point. According to the embodiment of the invention, the calibration speed of the gamma register can be improved.

The present invention discloses an overvoltage detection circuit. The overvoltage detection circuit comprises an overvoltage reference voltage source, an undervoltage reference voltage source, a power source voltage acquisition module, a logic circuit module, an overvoltage and undervoltage comparison module and a latch module; the logic circuit module comprises a two-input OR gate logic circuit OR1 and a two-input OR gate logic circuit OR2; the overvoltage and undervoltage comparison module comprises an overvoltage comparison module and an undervoltage comparison module; the overvoltage detection circuit integrates an overvoltage circuit and an undervoltage circuit; and an overvoltage point and an undervoltage point both have two threshold voltages, so that it can be ensured that the overvoltage detection circuit can operate stably in the vicinities of an overvoltage threshold point and an undervoltage threshold point. In addition, the overvoltage detection circuit of the present invention is different from an existing mainstream technology according to which hysteresis is realized through feedback, therefore, the response speed of the overvoltage detection circuit is greatly improved.

The invention discloses an over-temperature protection circuit. The over-temperature protection circuit comprises a constant current generation circuit, an output control circuit, and an output shaping circuit. An NPN transistor Q0 is employed as a control switch tube. A hysteresis control tube M4 can be employed as an NMOS tube and also can be employed as a PMOS tube. Temperature hysteresis is achieved through introduction of an extra current after over-temperature and a hysteresis temperature magnitude can be arranged through adjustment of a ratio of width to length of an M4 tube. The over-temperature protection circuit is simple in structure, does not need any high-precision voltage comparators, the used device number is low, the output precision is high, a turn-off signal can be generated at a thermal turn-off temperature threshold point accurately, debugging is convenient, the over-temperature protection circuit has a temperature hysteresis function, the hysteresis temperature can be arranged flexibly, heat oscillation phenomena are prevented, and the over-temperature protection circuit is suitable for usage of chips of a power supply and a driving circuit and the like.

The present invention discloses a characterization method for aging of cross-linked polyethylene insulation materials for submarine cables. The method comprises following steps: a) respectively performing mechanical, chemical, thermal and electrical performance tests on the cross-linked polyethylene insulation materials of different aging degrees, and obtaining a changing rule of each characteristic parameter along with the aging degree; and further dividing aging intervals, and establishing a reference sequence according to characteristic parameters corresponding to threshold points of different stages in the aging intervals; b) performing the same performance test as the step a) on the cross-linked polyethylene insulating materials at an unknown aging state, and establishing a to-be-matched sequence through using obtained characteristic parameters; and c) calculating correlation degree between the to-be-matched sequence established in the step b) and the reference sequence established in the step a), matching the aging intervals, and determining the aging degree of the materials. The characterization method combines multiple characteristic parameters of physical and chemical properties, combines with more scientific aging interval division and more accurate correlation calculation, and can comprehensively and accurately reflect aging state of the materials.

The invention discloses an optimization process-based method for rapidly detecting the bonding state of a coating interface and relates to the technical field of laser detection and material performance detection. The method comprises the following steps of: rapidly obtaining the failed laser density range of a coating by an optimization process; loading the coating point by point respectively by using pulse laser in the range to form dot discrete scratches of which the depths increase gradually; detecting the intensity change of reflected light on laser loading points of the discrete scratches through a power meter; when three continuous inflection points occur in a first recess on the powder density map of a detection point for the first time, considering that the recess is the failure threshold point P1 of the coating; and determining the failure critical point (failure threshold) of the coating by judging the length of a relatively short scratch. The method has the advantages of improving scratch efficiency and reducing damage to the coating through the rapid approach of the failed laser power density range of the coating by the optimization process and through the acquisition of the failure threshold by using a coating failure critical point judging process.

The invention relates to an integrated prediction method for fusing multiple major adverse cardiovascular event prediction models. The method comprises the following steps of binarizing output results of to-be-fused major adverse cardiovascular event prediction models, and according to the binarized output results of the prediction models, calculating a weight value of each independent prediction model by using a rough set theory; normalizing the output results of the to-be-fused major adverse cardiovascular event prediction models, and for the normalized output results of the prediction models, formatting an optimal classification threshold point to 0.5; and according to the weight values and the normalized output results, calculating basic probability assignment of each patient, combining output items of the independent prediction models by using a Dempster rule synthesis method to obtain a combined mass function, and calculating a final output value of the integrated prediction method. According to the integrated prediction method, the problem of uncertainty in models built by using electronic medical record data is solved, so that the prediction accuracy of the models is improved.

A cache programming method for a non-volatile memory device includes programming data for a current programming operation into a memory cell array, determining whether the current programming operation has been performed to a threshold point of program completion, and receiving a data for a next programming operation when the current programming operation has been performed to the threshold point of program completion.

Provided are a method, system, and computer program product for using gathered system activity statistics to determine when to schedule a procedure. Activity information is gathered in a computer readable storage medium indicating activity in a computer system during time slots for recurring time periods, wherein each time period includes a plurality of time slots. A high activity value is determined comprising an activity amount of a slot having a maximum amount of activity among the slots for the time periods and a low activity value is determined comprising an activity amount of a slot having a minimum amount of activity among the slots for the time periods. A threshold point is determined as a function of the high activity, the low activity, and a threshold percent comprising a percentage value. A determination is made as to whether there is at least one lull window having a plurality of consecutive time slots each having an activity value lower than the threshold point. A selection is made of one of the at least one lull window in response to determining that there is at least one lull window. The procedure in the computer system is scheduled to be performed during the time slots in the lull window in a future time period.

The invention discloses an amplitude-frequency time-varying process signal segmentation method based on a sliding window. The method comprises the following steps of: (1) setting a sliding window foran amplitude-frequency time-varying process signal to be analyzed; (2) calculating a mean value of each process signal point in the sliding window, and dynamically setting a segmentation threshold point under the process curve according to the mean value so as to obtain a lower segmentation line; (3) determining each lower segmentation point of the process curve according to the lower segmentationlines, and segmenting the process curve according to the lower segmentation points; And (4) calculating the similarity of the segmentation curves by using the process signals in the segmentation curves, and carrying out segmentation effectiveness judgment. According to the method, process period segmentation is carried out on the amplitude-frequency time-varying process curve, and the method canadapt to the change of process parameters and has relatively high adaptability, stability and robustness.

A non-conventional electrical circuit breaker with multiple cut-off threshold points, governed by built-in feed-back sensing circuits, which manipulates the tripping threshold values by sensing different requirements of maximum draw of current depending on the required circuit conditions and states of the application.

Present novel and non-trivial systems and methods for generating aircraft height data are disclosed. A processor is configured to receive both first data comprised of radar-based reflection data of a stationary reference point based upon a horizontal distance between the geographic position of an aircraft and the geographic position of the stationary reference point (e.g., landing threshold point) and second data comprised of internally sourced vertical travel data more frequently than the first data. From the first data and second data, an instant vertical distance above the stationary reference point is determined by updating the first data with the second data. Then, instant height data representative of the instant vertical distance above the stationary reference point is generated. Provided with the instant height data, a presentation system comprised of display unit, aural alert unit and / or a tactile alert unit may present the instant vertical distance to the pilot.

In an exercise machine, when a measurement starts, an electrocardiographic signal is detected by an electrocardiographic sensor 1 (ST33), a load drive is started (ST4), and heartbeat rate intervals of the electrocardiographic signal are sequentially obtained. A fluctuation of heartbeat rate intervals PI(n) % is obtained from a calculation formula in which the RR interval RR(n+1) of the current heartbeat is subtracted from the RR interval RR(n) of the previous heartbeat, which is then divided by RR(n) and multiplied by 100% (ST5). Entropy is calculated from 128 pieces of such PI (ST6). From the change of the entropy under the gradually increasing load (ST8), a minimum point of the entropy is obtained, which point is designated as an anaerobic threshold point (ST7). The load of the exercise machine is controlled employing this anaerobic threshold.

The invention provides a multipath error extraction method based on self-adaptive semi-soft threshold wavelet transform. The multipath error extraction method is applied to the elimination of multi-path errors in a global satellite navigation system. The multipath error extraction method comprises the steps of: firstly, acquiring a residual value of a double-difference pseudo-range by using a satellite observation value, and regarding the residual value as signals to be processed; performing multi-scale analysis on the signals to be processed by using wavelet transform, and extracting a multipath signal to be processed from the signals; and filtering the multipath signal to be processed by means of an FIR filter to obtain a final multipath error signal, wherein a threshold function in wavelet transform adopts a self-defined semi-soft threshold function, and a self-adaptive method is adopted for searching a threshold point. The multipath error extraction method provided by the inventionhas the advantages of small calculation amount, fast calculation speed and high implementability, and is capable of self-adaptive adjustment according to different experimental environments, so as toachieve the best effect of suppressing multipath errors.

A method of controlling the temperature of an environment, includes the steps of providing a thermostat and receiving a signal from an occupancy sensor indicating whether an area has been occupied for each discrete time period of a 24 hour time period, assigning a first point value to each discrete time period where occupancy has been sensed, and repeating the steps for the next two 24 hour periods, and averaging the point values for each discrete time period in the first, second, and third 24 hour periods, to obtain an average point value, and sending a first signal to a heating device adapted for heating a second area to provide a temperature-related setting for a given discrete time period when the average point value for that discrete time period is above a threshold point value.