134 results about "Error limit" patented technology

A method of computing a manufacturing yield of an integrated circuit having device shapes includes sub-dividing the integrated circuit into failure mechanism subdivisions (each of the failure mechanism subdivisions includes one or more failure mechanism and each of the failure mechanisms includes one or more defect mechanisms), partitioning the failure mechanism subdivisions by area into partitions, pre-processing the device shapes in each partition, computing an initial average number of faults for each of the failure mechanisms and for each partition by numerical integration of an average probability of failure of each failure mechanism, (the numerical integration produces a list of defect sizes for each defect mechanism, and the computing of the initial average includes setting a maximum integration error limit, a maximum sample size for a population of each defect size, and a maximum number of allowable faults for each failure mechansim), and computing a final average number of faults for the integrated circuit by iterativelly reducing a statistical error of the initial average number of faults for each of the failure mechanisms until the statistical error is below an error limit.

A method for processing an array of pixels in a point cloud, comprises calculating local error limits for each distance value for each pixel in the processed point cloud data set. One may then determine the error bar. One begins a distance value adjusting loop by for each pixel in the processed point cloud data set by calculating the difference between the distance value in the pixel of the point cloud data set being processed and each of the neighboring pixels or the most suitable neighboring pixel distance value is determined whether the difference is within the range defined by the error bar. It the difference is not within the error bar, the distance value is changed for the pixel being processed by a small fraction while keeping the new distance value within the range defined by the original distance value for the pixel being processed plus or minus the error bar. If the difference is within the error bar the distance value in the pixel being processed is replaced by a weighted average value. The number of neighboring pixels with their distance values within the error bar for the pixel being processed is counted and if the count is greater than a predetermined threshold, average the counted distance values and substitute the average for the pixel distance value, but if the count is below the threshold leave the pixel distance value unchanged. It is determined whether loop exit criteria have been met and if loop exit criteria have not been met beginning the loop again, and if loop exit criteria have been met, terminating the loop.

Systems and methods for enhanced quantum key distribution (QKD) using an actively compensated QKD system. The method includes exchanging quantum signals between first and second QKD stations and measuring the quantum signal error. An error signal SE representative of the system visibility error is then generated. An error-signal threshold STH that defines a system visibility error limit is then selected. Those qubits measured with the condition SE>STH are called “above-threshold” qubits, while those qubits measured with the condition SE≦STH are called “below-threshold” qubits. Only below-threshold qubits are stored and used to form the final quantum key. This is accomplished by sending a blanking signal SB to the memory unit where the qubits are stored. The blanking signal prevents above-threshold qubits from being stored therein. The raw quantum key so formed has few errors and thus forms a longer final quantum key for a given number of exchanged quantum signals.

The invention discloses an automatic clock oscillator calibration method and an automatic clock oscillator calibration circuit adopted for implementation of the method. The automatic clock oscillator calibration method comprises the following steps of: generating a specific period T through counting of an external precision reference clock, counting clock signals to be calibrated during the period T, comparing an obtained count value with a standard count value of the clock signals to be calibrated, carrying out rough adjustment by increasing or decreasing a control word with dichotomy according to the comparison results, realizing that a frequency of the clock signals output by a clock oscillator to be calibrated is within the acceptable error limit of a frequency corresponding to the standard value, then carrying out fine adjustment around a control word which is obtained by rough adjustment and finding a control word which can minimize the frequency error. The invention can be used for rapidly calibrating the clock oscillator, thereby greatly improving calibration speed of the clock oscillator and guaranteeing precision of the calibration.

Flaws in information security infest modern software, and pervasive computing has made network systems vulnerable. Information security is constantly endangered by errors in protocol implementations. Testing a protocol implementation for errors directly from a network where a device implementing the protocol resides limits the coverage of protocols tested. In contrast, testing protocols from an access network that internetworks a customer premises with one or more service networks greatly expands the coverage of protocols tested. Accordingly, a method and corresponding apparatus are provided to test from the access network, testing both service network devices and customer premises devices, and the protocols implemented on those devices.

The invention relates to the image processing area including following steps. (1) With being read from the USB port by the computer, the target images to be processed are stored in the memory. (2) The images to be compressed are carried out the lossless color sphace transformation. (3) The current pixels are predicted by using the two dimensions weighted predication model. The predicted residual is calculated. (4) Whether the mapped predicted residual is less than the preset error limit or not is determined. The self-adopting adjustment is needed if the residual exceeds the threshold. (5) The RICE entroy coding is accepted. (6) The compressed result of the image is output and saved. The invented method possesses the advantages of lower complexity, higher compression ratio and high executing speed.

The invention discloses a monocular visual error measurement system for a cooperative target and an error limit quantification method. The monocular visual error measurement system is specifically characterized in that visual marker points are formed in the outer surface of the cooperative target, a calibration target adopts a black and white checkerboard like pattern and is used for the intrinsic and extrinsic parameter calibration of a camera, the camera is used for acquiring the images of the visual marker points and the images of the calibration target in one frame and transmitting the images to the computer, a first theodolite and a second theodolite are used for observing the calibration target to obtain an observation value A, observing the visual markers to obtain an observation value B and transmitting the observation value A and the observation value B to a computer, and the computer is used for receiving the calibration target image and marker image acquired by the camera, the observation value A and the observation value B, computing the camera pose measurement value and the real pose value of the cooperative target relative to the camera and computing a measurement error. By adopting the error limit quantification method, the measurement error can be quantified and decomposed so that each key parameter index is in the error limit.

The invention relates to a method for updating a boiler on-line combustion optimization model. The method utilizes the data exceeding the predictive error limit of an exit model to build a new model, then utilizes combustion data of a boiler and an optimization algorithm to find an optimum new model and the weight coefficient of the existing model, and utilizes an optimum weight coefficient to combine the new model with the existing model so as to predict the working conditions of a new boiler for realizing model update. The invention overcomes the defects that the traditional update method gives up the existing model and can not utilize the study result of the existing model to fully utilize the study result of the existing model, thereby greatly reducing the amount and the time of the calculation work of model update.

A method for enhancing color fidelity in multi-reproduction, includes scanning an image to be reproduced, wherein the image contains an invisible digital watermark including color information; decoding the color information contained in the watermark; comparing the decoded color information with the scanned image; generating a correction table from the differences between the decoded color information and the scanned image; and performing color correction on the scanned image using the correction table. This method confines the color error to one generation, even when copies go through multiple reproduction.

The invention discloses a high-precision harmonic parameter estimation method based on a composite iterative algorithm. The method comprises the steps as follows: firstly, a harmonic amplitude value is directly calculated by utilizing a three-peak interpolation algorithm, and meanwhile, a harmonic phase is calculated to serve as an initial phase value for composite iteration, then the initial phase value is transmitted to a phase difference correction algorithm to obtain a frequency deviation value by utilizing the phase difference correction algorithm, and the phase difference correction algorithm is combined with a spectral leakage cancellation algorithm so as to obtain a phase value for the first-time iterative computation; circulating iteration is performed between the phase difference correction algorithm and the spectral leakage cancellation algorithm repeatedly until a phase iteration result meeting the error limit requirement is obtained. According to the invention, with the adoption of the three-peak interpolation algorithm, the estimation precision of the harmonic amplitude value is improved, and the phase obtained by utilizing the three-peak interpolation algorithm serves as an initial value, and the phase difference correction algorithm and the spectral leakage cancellation algorithm are combined to construct the composite iterative algorithm, so that the estimation precision of a harmonic phase and frequency is greatly improved.

Disclosed is a method of determining when to calibrate a time-of-flight mass spectrometer. In various embodiments, the method comprises storing within a controller a set of parameters for the mass spectrometer; providing an updated set of parameters while retaining at least one set of previously stored parameters; computing at least one rate of change of the updated set of parameters with respect to the at least one set of previously stored parameters; and determining when to calibrate the mass spectrometer from the results of computing the rate of change of at least one of the parameters. In various embodiments, a parameter stored can be a set of temperatures derived from obtaining system temperature measurements of those components whose changing temperature is an indication of mass drift. In various embodiments, the controller can store a history of calibration factors and temperatures over time, can calculate the time rate of change of the calibration factors and the temperature to estimate the mass drift rate of the instrument and compare the drift rate to a predetermined mass error limit for determining when re-calibration can be scheduled.

A method for enhancing color fidelity in multi-reproduction, includes scanning an image to be reproduced, wherein the image contains an invisible digital watermark including color information; decoding the color information contained in the watermark; comparing the decoded color information with the scanned image; generating a correction table from the differences between the decoded color information and the scanned image; and performing color correction on the scanned image using the correction table. This method confines the color error to one generation, even when copies go through multiple reproduction.

The invention discloses a cooperative target pose precision measurement method based on a PNP perspective model. The cooperative target pose precision measurement method comprises the following steps: mounting N vision mark points on the outer surface of a cooperative target; photographing a mark image of a vision mark by using a camera; pre-setting an initial value of a position pose between the cooperative target and the camera, wherein horizontal and vertical components of a three-dimensional space coordinate and the effective focal length of the ith vision mark point, and horizontal and vertical components of a main point coordinate are in uncertain system errors and error limits are known, a two-dimensional coordinate of the center of the vision mark point in the mark image corresponding to the ith vision mark point is in a random error, and the corresponding error limit is known; quantifying and analyzing an influence weight coefficient of a pose error by each parameter; and calculating an uncertain system error component and a random error component of the position pose between the cooperative target and the camera, and weighing to obtain a target pose measurement error, so as to finish the pre-estimation of the target pose measurement precision.

The invention discloses an evaluation method for RSS (Received Signal Strength) / AOA (Angle of Arrival) / TDOA (Time Difference of Arrival) positioning performance under an indoor WLAN (Wireless Local Area Network) environment. The evaluation method comprises the following steps: firstly, making different observed quantities to be subject to the respective Gaussian distribution respectively according to a statistical property of signal distribution under the indoor WLAN environment; then using the characteristic of a Fisher information matrix to respectively calculate the error limits of individual RSS, AOA and TDOA positioning methods; secondly, using a multivariate normal distribution function to describe probability distributions of multiple observed quantities, and respectively calculating to obtain the error limits of RSS / AOA, RSS / TDOA, AOA / TDOA and AOA / TDOA / RSS mixed positioning methods; finally, quantitatively analyzing the influence of the positioning method based on different observed quantities to the error limit, and comprehensively evaluating the positioning performance of the RSS / AOA / TDOA. The evaluation method for RSS / AOA / TDOA positioning performance under the indoor WLAN environment improves the positioning precision of the indoor WLAN positioning method.

The invention discloses an intelligent electric energy meter constant test system. The system comprises a standard source, a standard meter, at least one detected electric energy meter, an error arithmetic unit and a communication interface. The system is characterized in that the standard source can arbitrarily set a voltage, a current and a power factor, provides a three-phase voltage for the standard meter and a detected voltage line and provides a three-phase current for a current line; a detected meter is connected in parallel to each phase of voltage line of the standard meter, and the electric energy meter is connected in series with each phase of current line of the standard meter; and the electric energy meter and the standard meter are connected to the error arithmetic unit through the communication interface respectively. In the invention, based on a traditional standard meter method, under a selected operation condition, the detected meter and the standard meter simultaneously operate for a period of time and electrical energy values of the two are compared so as to acquire an error of the detected electric energy meter; and according to a relation of the error and a basic error limit of the detected electric energy meter, whether a constant of the detected meter satisfies a requirement under the selected operation condition can be determined.

The invention discloses a method for acquiring delay errors of ionosphere and a system. Through the method, error sequences and error limit ranges of ionospheres of all breakthrough points of a reference station can be acquired, and be directly sent to a user; and the user can acquire delay errors of the ionosphere of a breakthrough point of the user according to the breakthrough point of the user and the acquired error sequence and error limit range of the ionosphere of the breakthrough points of the reference station. Meanwhile, the invention also discloses a system for acquiring delay errors of the ionosphere. The method for acquiring the delay errors of the ionosphere can effectively reduce treatment and calculation amount of ionosphere corrected data, improve acquisition precision of the ionosphere delay errors and reliability of a navigation system, and is particularly suitable for the navigation system consisting of a plurality of constellations.

This disclosure describes systems and methods for determining a voltage margin (or margin) of a serializer / deserializer (SerDes) receiver in mission mode using a SerDes receiver. This is done by time-division multiplexing a margin determination and a tap weight adaptation onto the same hardware (or software, or combination of hardware and software). In other words, some parts of a SerDes receiver (e.g., an error slicer and an adaptation module) can be used for two different tasks at different times without degrading the effectiveness or bandwidth of the receiver. Hence, the disclosed systems and methods allow a SerDes receiver to determine the SerDes margin in mission mode and without any additional hardware or circuitry on the receiver chip.

The invention proposes an audio current fault tolerance method based on border gradient. The method divides audio current into three grades: sequence, frame, and macro block. Different fault tolerance strategy is adopted according to the characteristics of the grammar elements in all grades. As for the sequence grade and the frame grade, fault tolerance should be implemented according to specific application environment, and the fault tolerance of the macro block grade are implemented by three steps: effective fault limitation, fault test of the lexeme and border gradient of a synthetic code current, and a self-adaptive fault hiding technology. The experiment results show that with the adoption of the audio current fault tolerance, the subjective and objective quality of the decoder restoring images is greatly improved.

The invention discloses a complex profile curve grinding error in-situ detection device and method. The detection device includes a motion controller, a computer, a position measurement member, a slide table assembly, a tool nose arc grinding wheel, and an image acquisition member. The detection method includes: calculating a machining error and determining reasons for the error according to different relative positions among a tool nose arc center theoretical position of the front end of the tool nose arc grinding wheel, a work piece theoretical machining point position and a work piece actual profile; and adopting different method to further determine the direction and the size of the error according to different reasons for the errors if the machining error exceeds an error limit. The detection device can detect the size and the directions of multiple errors such as grinding wheel abrasion, machine tool geometric errors, machine tool thermal errors during a curve grinding machining process, is comprehensive in detection, is high in precision, and can provide a basis for later error compensation so as to improve the machining precision of curve grinding.

A gamut error false color display uses false coloring on a monochrome image of a video picture being tested. Composite and component gamut error signals are extracted from an input video signal representing the video picture being tested. Such error signals may represent gamut error states corresponding to near out-of-gamut, out-of-gamut high, near out-of-gamut low, out-of-gamut low, etc. A false color display generator has the gamut error signals and a luminance component of the input video signal as inputs and outputs the gamut false color display as the monochrome image with different colors for those pixels in the monochrome image that correspond to the gamut error signals when a gamut error is indicated. Each display component may be tested for gamut errors as well as the video picture as a whole (component or composite). Also either fixed or variable persistence may be used to identify gamut errors over several video pictures in the input video signal. A counter may be used to count the gamut errors detected in order to take a “snapshot” of the gamut error display when a predetermined error limit is reached.

The invention provides an interference observer-based second-level inverted pendulum self-adaptive sliding-mode control method. Aiming at the problem of stable control of a second-level inverted pendulum system with the presence of external disturbance, the method comprises the steps of firstly, building a differential equation of the second-level inverted pendulum system according to lagrange equation, performing linear processing on a position near to a balance position, and deducing linear state equation and output equation with the external disturbance; and secondly, designing a sliding mode, compensating a system unknown model in the sliding mode by a non-linear interference observer so that the design of a controller does not need to know structure and parameter of the system, and designing a self-adaptive rule in the controller to adjust known estimation by considering known estimation error limit of the observer. A sliding-mode parameter is solved by LMI, a sigmoid function is used for substituting a symbol function in the controller, and a jittering phenomenon is eliminated.

This invention discloses a method for automatic error detection in pressure measurement and an electronic sphygmomanometer using the method. The electronic sphygmomanometer comprises two pressure sensing circuits connected to a MPU. The first pressure sensing circuit is normally-on in pressure measurement. The second pressure sensing circuit is normally-off in pressure measurement. Said normally-off pressure sensing circuit is periodically turned on in an automatic manner to measure the same pressure as the normally-on pressure sensing circuit is used to measure. Said MPU computes the difference between the pressures obtained from the two pressure sensing circuits. When the difference is greater than a given error limit, calibration error warning will be given.

Methods and systems for monitoring operation of an LED string. An exemplary system includes an LED string, a circuit that supplies current to the LEDs, a current measuring circuit that measures current through the LEDs, a voltage measuring circuit that measures voltage across the LEDs, and a temperature sensor that measures temperature proximate to the LEDs. A processor calculates a predicted string voltage based on a predefined voltage-current curve, number of LEDs, a predefined temperature coefficient value, the measured string current, a measured junction temperature, a life curve function, a prestored calibration string current value, a prestored calibration string voltage value, a prestored junction calibration temperature and an accumulated time value. The process also calculates an error value based on the predicted string voltage and a measured string voltage and generates an indication that there is a failure in the LED string if the calculated error value is greater than the predefined error limit.

The invention relates to an equivalent harmonic impedance method for calculating the single-point equivalent of a power grid. The method comprises the steps of firstly, acquiring the bus voltage at a point of common coupling and the current of a current branch of a focused harmonic source, conducting the fourier transformation and decomposing the voltage and the current to obtain a harmonic voltage and a harmonic current; secondly, grouping every five pairs of the bus harmonic voltage at the point of common coupling and the harmonic current of the infusion bus of the focused harmonic source as one group to establish a complex domain partial linear model, and figuring out an equivalent harmonic impedance estimated value, an equivalent harmonic voltage estimated value and an estimated error thereof for each group; on the condition that the minimum value of the estimated errors of all groups is greater than a given error limit value, re-selecting data groups for calculation; otherwise, figuring out the mean value of equivalent harmonic impedance estimated values corresponding to the minimum value when the minimum value is smaller than or equal to the given error limit value, namely the equivalent harmonic impedance of the power grid in the single-point equivalent state. According to the technical scheme of the invention, the equivalent harmonic impedance of the power grid in the single-point equivalent state can be obtained accurately.

The invention relates to a multi-leg cooperative control method for an underwater multi-leg robot system, belongs to the technical field of cooperative control of underwater multi-leg robots, and aimsto solve the problem that a communication delay exists among different mechanical legs due to the influence of a processor operation speed and a signal transmission path on a multi-leg robot. A barrier Lyapunov function in a logarithmic form is introduced, so that a trajectory tracking error of the system always meets a set error limit requirement; only a communication topology among the different mechanical legs is required to be a directed graph, and only part of followers can obtain information of a leader, so that the communication burden caused by global knowing of the information is avoided; and an input signal source is selected as a virtual leader, so that the change of the leader is more flexible, and the requirement of the robot on the motion flexibility is met. The method is suitable for cooperative motion control of the underwater multi-leg robot.

The invention discloses a checking method of a subsidiary electronic belt scale. The checking method comprises the following steps: step 1) recording a material flow A1 of a total electronic belt scale; step 2) adjusting the material flow of a subsidiary electronic belt scale, wherein the adjusting volume is A2; step 3) recording a new material flow A3 of the total electronic belt scale after the electronic belt scale works for a certain time period T1; step 4) substituting A1, A2 and A3 into a calculation formula as follow: checking parameter alpha=(A1-A3) / A2, and figuring out alpha; and step 5) comparing alpha with an error limit value B1, and obtaining the checking result. According to the checking method of the subsidiary electronic belt scale provided by the invention, the total electronic belt scale is adopted to check the subsidiary electronic belt scale; and in the whole checking process, the operation of automatic burdening production line is unnecessary to be stopped, the synchronous operation of production and checking is realized, and the scale is checked by the scale in the same standard, so that the checking precision is high.

The invention discloses a universal detection device of an engine valve lift, which comprises a dial indicator, a fixed frame, a connecting plate, a speed reducing mechanism, a first angle dial and a second angle dial, wherein the fixed frame is fixedly connected with the speed reducing mechanism, the speed reducing mechanism is fixedly connected with the connecting plate, the first angle dial is arranged on the output shaft of the speed reducing mechanism, and the dial indicator is fixedly connected with the second angle dial. The universal detection device can be used as fixed equipment for long-term use and can ensure the precision since references are relatively fixed; the references of all the parts of the device are unified, the errors are fixed, the precision is within an acceptable range, and a relative error limit can be computed through absolute errors; the axial line of the dial indicator and the axial line of a valve rod are easily adjusted to be collinear, and the valve stroke can be truly reflected through measured numerical values; through the two-stage speed reducing mechanism, the rotating speed of the output shaft can be decreased, the torque of an input shaft is reduced, the operation is quite easy, and particularly a unidirectional clutch prevents the input shaft from reversely rotating and further ensures the rotating accuracy of the input shaft; and the device has strong adaptability.

An optical disc unit 2001 comprises: reflective surface detection means 1010 for detecting a reflective surface; focus control means (1202, 1003, 1009, 1008, 1003, 1012, 1005 and 1204) for performing focus control to a reflective surface so that the distance between the focal point of an optical beam applied to an optical disc 2100 and the reflective surface is within a predetermined error limit; shift means 1007 for shifting the focal point of the optical beam in a direction perpendicular to the optical disc; and control means 1006 for controlling the focus control means and the shift means.

The invention relates to a method for tracing the maximum power of a photovoltaic system based on finite time fuzzy sliding mode control. Firstly, the maximum power tracing problem of the photovoltaicsystem is re-interpreted in a model framework of a singular nonlinear system. Then, a T-S fuzzy modeling method is used for selecting six fuzzy sets to carry out fuzzification on the singular nonlinear system to obtain a singular T-S fuzzy system. A finite time fuzzy sliding mode controller is designed, and the time of reaching a sliding mode surface by the photovoltaic system is calculated. On the basis of a calculated time interval, an error limit of realizing maximum power tracing of the system when the photovoltaic control system reaches the sliding mode surface is further calculated. According to the method, the maximum power of the photovoltaic system can be traced in finite time under external disturbance, so that the photovoltaic power generation efficiency is improved; and the method has a wide market application prospect.

This numerical control device (1) for a machine tool, which controls the positional relationship between a workpiece on a table and a tool by moving the table or the tool along a plurality of translation axes, is provided with the following: an analysis processing unit (21) that outputs a movement path and a feed speed along said movement path on the basis of a machining program that contains a plurality of command blocks; a speed-waveform calculation unit (23) that calculates a speed waveform between a stationary state and a state corresponding to the aforementioned feed speed on the basis of said feed speed and preset acceleration and jerk limits; a corner-curve calculation unit (24) that calculates curve equations for corner curves obtained by smoothing the abovementioned movement path at the boundaries between the abovementioned command blocks on the basis of a preset path-error limit, the movement path, and the aforementioned speed waveform; and a movement-command generation unit (22) that outputs a movement command for each translation axis on the basis of the movement path and the aforementioned curve equations.