83 results about "Sources of error" patented technology

Methods of determining a corrected analyte concentration in view of some error source are provided herein. The methods can be utilized for the determination of various analytes and/or various sources of error. In one example, the method can be configured to determine a corrected glucose concentration in view of an extreme level of hematocrit found within the sample. In other embodiments, methods are provided for identifying various system errors and/or defects. For example, such errors can include partial-fill or double-fill situations, high track resistance, and/or sample leakage. Systems are also provided for determining a corrected analyte concentration and/or detecting some system error.

Systems and methods for measuring overlay error in a video-based augmented reality enhanced surgical navigation system are presented. In exemplary embodiments of the present invention the system and method include providing a test object, creating a virtual object which is a computer model of the test object, registering the test object, capturing images of control points on the test object at various positions within an augmented reality system's measurement space, and extracting positions of control points on the test object from the captured images, calculating the positions of the control points in virtual image, and calculating the positional difference of positions of corresponding control points between the respective video and virtual images of the test object. The method and system can further assess if the overlay accuracy meets an acceptable standard. In exemplary embodiments of the present invention a method and system are provided to identify the various sources of error in such systems and assess their effects on system accuracy. In exemplary embodiments of the present invention, after the accuracy of an AR system is determined, the AR system may be used as a tool to evaluate the accuracy of other processes in a given application, such as registration error.

A welding power supply including power conversion circuitry adapted to receive a primary source of power, to utilize one or more power semiconductor switches to chop the primary source of power, and to convert the chopped power to a welding output is provided. The provided welding power supply includes a pulse width modulated (PWM) digital controller including gate drive circuitry that generates a PWM output signal that controls the switching of the one or more power semiconductor switches. The PWM output signal includes a duty cycle term corrected for one or more sources of error in the welding system.

The invention proposes a transmission/reception arrangement (1) which contains a respective distortion unit (5, 6) for the transmission and reception paths (2, 3) and also a calibration apparatus (7). By sending a test signal in an operating mode for calibration and returning the test signal processed in the transmission path (2) to the reception path, it is possible to evaluate the error signals in the transmission and reception paths. In line with the principle proposed, this is done by evaluating the spectral components of the returned received signal which each represent single sources of error in the transmission or reception path. This allows calculation of calibration parameters for suppressing these errors both in the transmission path and in the reception path.

Method and apparatus of integrating a three-axis magnetometer and a three-axis accelerometer to provide attitude and heading, calibrated magnetometer and accelerometer data, and angular rate, while removing sensor error sources over time and temperature and to compensate for hard and soft iron distortions of the Earth magnetic field. Filtered accelerometer data are corrected to account for various error sources. The magnetic heading is calculated from a horizontal magnetic field vector transformed from three dimensional Earth's magnetic field vector by using quasi-static roll and pitch angles from the filtered accelerometer data. A first Kalman filter estimates the state vector, based on the principle that the magnitude of local Earth's magnetic field vector is constant, to form hard and soft iron correction matrices. A second Kalman filter estimates a correction matrix of coupled remaining soft iron and the misalignment of the magnetometer and the accelerometer, as the dot product of local Earth's magnetic field vector and a corrected gravitational acceleration vector, at a quasi-static position, is constant. The three dimensional Earth's magnetic field vector is received by removing the hard and soft irons through the soft iron and hard iron correction matrixes.

A method for detecting the most likely source of an error in a document image processing system which processes sets of related documents. A set of characteristics is selected as being indicative that the document image, or item, is the source of the error. Each of the characteristics is assigned a weight, wherein the weight is in proportion to the likelihood that an item exhibiting the characteristic is the source of error. The items are ranked according to the characteristics exhibited by each item.

A sensor module is able to sense at least one aspect of objects produced by a plurality of object sources. Since one sensor module or set of sensor elements is used to examine out put from the plurality of object sources, sensor to sensor variation is removed as a source of error. In a multi-engine document processor, information from the sensor module is used to adjust process actuators, adjust image data and/or generate scheduling constraints to improve output consistency. For example, facing pages of a document are rendered only on marking engines operating within a predetermined tolerance of one another. Image data may be altered so that related images are within the measured capabilities of a plurality of marking engines. System actuators, such as xerographic actuators, of selected marking engines are adjusted to improve output consistency between marking engines.

A system and method for enabling storage area network (SAN) component migration are provided. An end-to-end systems management console, referred to as the hardware migration assistant, is provided to simplify the migration steps for a SAN administrator to replace key SAN components. The hardware migration assistant provides a single interface suitable for stepping the SAN administrator through the reconfiguring task faster and with fewer sources of error than the known distributed manual process. The hardware migration assistant of the illustrative embodiments provides an interface through which a user may specify a type of SAN component that is being replaced and identifies the particular SAN components that are being replaced. The hardware migration assistant provides a knowledge base for guiding the user through the replacement operation and the reconfiguring of the SAN components, including the new SAN components, based on the previous configuration of the replaced components.

The present invention concerns a method of updating a database created with a spreadsheet program, for example with the Excel computer program. The manipulation of databases in a spreadsheet program may be a source of errors and lack user-friendliness to ensure that it is efficiently used. The main object of the invention is to ensure a uniformity and to facilitate the task of a user in the creation and maintenance of such a database. Accordingly, the object of the invention is an updating method. The data of the database are located in a first range of cells, and update parameters are located in a second range of cells. At least one updating function is applied to a determined set of cells of the first range of cells, each updating function using update parameters contained in determined cells of the second range of cells.

The invention provides a target location method of an unmanned plane, which belongs to the technical field of target location. The target location method comprises the steps of: firstly determining the target position, obtaining the coordinates of n positions of a plane by a navigation system of the plane, obtaining the distance between the n positions of the plane and the target M by laser ranging, writing n equations with the target coordinates as unknown quantities, carrying out linearization on the equation set formed by the n equations and solving the equation set by adopting the least square method to obtain the coordinates of the target M. The target location method provided by the invention is suitable for any orographic conditions; the sources of error are few, and only comprise aircraft position error and laser ranging error, so that higher locating precision can be obtained; and furthermore, the algorithm is simple and the method is easy to realize.

The invention proposes a precipitation pattern identification method based on the information of attenuation and polarization of microwave links. The method comprises the steps of: selecting the information of attenuation and polarization of the dual-frequency or multi-frequency microwave links to extract differential attenuation feature quantities; training the relationship between the differential attenuation feature quantities and different precipitation patterns to establish a training set; and establishing an identification model of precipitation patterns based on a machine learning algorithm to achieve automatic identification of precipitation patterns. The precipitation pattern identification method based on the information of attenuation and polarization of the microwave links fully utilizes the microphysical information of the abundant rainfall particles contained in the rain attenuation of the multi-frequency microwave links, not only improves the accuracy of the precipitation pattern identification, but also avoids the complex inversion process of the raindrop spectrum distribution, thereby reducing the source of error and has high operability. The monitoring and identification effects of regional rainfall types are further improved by using the precipitation pattern identification method in conjunction with weather radars, raindrop spectrometers and the like.

We describe a reference cell structure for determining data storing cell resistances in an SMT (spin moment transfer) MTJ (magnetic tunneling junction) MRAM array by comparing data cell currents with those of the reference cell. Since the reference cell also utilizes spin moment transfer (SMT) magnetic tunneling junction (MTJ) cells, there would ordinarily be the danger that the act of reading the reference cell could change its magnetization orientations and be a source of error for subsequent comparisons. Therefore the present invention describes a new circuit arrangement for the reference cell that directs read currents through two SMT MTJ cells in opposite directions so that the transfer of spin moments cannot affect the relative magnetization directions of the cells.

The present invention relates to a method and system for assessing the risks and/or exposures associated with financial transactions using various statistical and probabilistic techniques. Specifically, the present invention relates to a method and system for identifying plausible sources of error in data used as input to financial risk assessment systems using Bayesian belief networks as a normative diagnostic tool to model relationships between and among inputs/outputs of the risk assessment system and other external factors.

Data acquired using a pulsed nuclear source are susceptible to two sources of error. One error is due to large statistical noise towards the end of an acquisition window. Another source of error is the contamination of the early portion of the data by borehole and other effects. The beginning of the processing window is adjusted based on the signal level at the end of the processing window for the preceding pulsing of the source. The end of the processing window is derived from statistical considerations.

An apparatus, that is particularly advantageous for compensating for the earth's magnetic field at a fluxgate current sensor. The apparatus and method actively compensate for local anomalies and loop mismatch at local segments distributed around closed loops of ferromagnetic material in order to null out sources of error that arise in the presence of an external magnetic field. External flux nulling circuits null the external magnetic flux at each of a plurality of associated pairs of diagonally opposite segments of coaxial closed loop cores. Each flux nulling circuit has a pair of diagonally opposite segment sensing coils and a pair of diagonally opposite segment cancellation coils. A flux detecting circuit detects the net magnetic flux in associated, diagonally opposite segments. A negative feedback control circuit drives the segment cancellation coils with a current to drive the flux detected by the segment detecting circuit to a minimum.

A test structure for statistical characterization of local device mismatches contains densely populated SRAM devices arranged in a row/column addressable array that enables resource sharing of many devices. The test structure includes a built-in sensing mechanism to calibrate or null out sources of error, and current steering to avoid negative effects of current leakage along spurious paths. The gate and drain lines of each column are driven from both the top and bottom to minimizes parasitic effects. The system can handle a large number of devices while still providing high spatial resolution of current measurements.

When reservoir capacitors are moved on-chip for individual bit decisions, a successive approximation register analog-to-digital converter (SAR ADC) has an addition source of error which can significantly affect the performance of the SAR ADC. Calibration techniques can be applied to measure and correct for such error in an SAR ADC using decide-and-set switching. Specifically, a calibration technique can expose the effective bit weight of each bit under test using a plurality of special input voltages and storing a calibration word for each bit under test to correct for the error. Such a calibration technique can lessen the need to store a calibration word for each possible output word to correct the additional source of error. Furthermore, another calibration technique can expose the effective bit weight of each bit under test without having to generate the plurality of special input voltages.

The invention provides an error information positioning system and method. The system comprises a log processing device, and a plurality of servers respectively connected with the log processing device, wherein each server is used to search in each log file periodically according to error identifiers defined in advance to obtain respective error log sets in current period and report the respective error log sets in current period to the log processing device, and the log processing device is used to classify multiple lines of error logs in all received error log sets according to request identifiers to obtain multiple lines of error logs corresponding to each request identifier and determine the error source server corresponding to a current request according to the request server identifier in each line of error log corresponding to the current request identifier, the identifier of the current server and the identifier of a target server. The defects of long time, low efficiency and high manual cost in the prior arts for manual error checking can be overcome.

The present invention is directed to a method for debugging scan testing failures of integrated circuits. The method includes identifying good and bad scan paths among a set of scan paths. A scan path is bad if it is not producing any output. A scan path is good if it is producing a correct output. A clock set is generated for each scan path. The clock set includes all clock elements whose outputs impact the scan path. A union of the scan path clock sets for the bad scan paths is created. Good clock elements are removed from the union. A clock element is presumed to be good if it is associated with a good scan path. Clock elements remaining within the union of clock sets for the bad scan paths are analyzed to determine the source of errors. In one embodiment, multiple input clock elements in all bad scan paths are analyzed first, followed by analysis of single input clock elements in all bad scan paths and followed by analysis of any other clock elements in any of the bad scan paths. In an alternative embodiment, failure probabilities are associated with clock elements to prioritize analysis and debugging.