46 results about "Fourth moment" patented technology

The present invention provides a detecting method for the unusual point of the high spectrum image based on the selective nuclear main composition analyzing, and relates to the high spectrum image analyzing and defecting technology field. The present invention aims at solving the problem that the prior high spectrum image defecting method cannot conduct character extracting on the unusual point effectively, and produce more false alarm, and cannot detect the unusual point effectively under high background disturbance. The present invention has the procedures that the data is normalized, and the nuclear main composition is analyzed; a sliding window is constructed in the main sub-quantity; the third moment and the fourth moment of the pixel in the sliding window are calculated and compared the moments with a preset value; the value is recorded after reading all over the main sub-quantity; all the main sub-quantity are processed; the maximal main sub-quantity is selected; the unusual point detecting on the selected main sub-quantity is conducted by the RX operator, and the detecting result is output. The present invention can extract and select the character of the unusual point object in the high spectrum image effectively, and can lower the false alarm rate, and can detect the unusual point normally under high background disturbance.

The invention discloses a code rate regulating method based on a cloud game. The method comprises the steps that the first moment when a client side collects first operation data and the second momentwhen the client side sends the first operation data to a server are determined; the third moment when the client collects second operation data and the fourth moment when theclient side sends the second operation data to the server are determined; according to the first moment and the third moment, a first time difference is calculated; according to the second moment and the fourth moment, a second time difference is calculated; according to the first time difference and the second time difference, the current network condition is determined, and according to the current network condition, the code rate of a cloud game display picture is correspondingly regulated. The invention further discloses a code rate regulating device based on the cloud game and a storage medium.

The embodiments of the present invention disclose a network delay detection method, a device and a system. The method comprises the steps of sending an operation administration and maintenance (OAM) detection message to a transponder in a forwarding network by a controller; recording the first moment T1 of sending the OAM detection message; receiving a response message returned from the transponder by the controller; recording the fourth moment T4 of the response message reaching the controller, wherein the load of the response message contains the second moment T2 of the OAM detection message reaching the transponder and the third moment T3 of the response message reaching the transponder; and calculating the network delay according to any two moments out of the first moment T1, the second moment T2, the third moment T3 and the fourth moment T4 by the controller. In this way, the controller receives the response massage only once, so that the resource of control channels is saved.

The invention relates to a clock synchronization method, a clock synchronization device and a computer readable storage medium. The clock synchronization method comprises the following steps: sending a clock synchronization request to a server and recording a first moment when the clock synchronization request is sent; receiving response data sent by the server and recording a second moment during receiving, wherein the response data comprises a third moment when the server receives the clock synchronization request and a fourth moment when the server sends the response data; obtaining clock deviation between the client and the server according to the first moment to the fourth moment; and obtaining a system clock of the client, and obtaining a synchronous clock of the server in combination with the clock deviation. According to the clock synchronization method, the clock synchronization request is sent to the server, the response data sent back by the server is received, and the clock deviation between the client and the server is obtained according to several sent and received moments, so that the system clock of the client is adjusted, and the system clock is synchronized with the clock of the server.

The invention discloses an information processing method which is applied to an electronic device. The electronic device can play first data with play duration. The method comprises the steps of judging whether a first condition is met when the electronic device plays the first data; switching to a second moment of the first data from a first moment of the first data when a judgment result shows that the first condition is met, wherein the second moment and the first moment form a first time interval; judging whether a second condition is met; switching to a fourth moment of the first data from a third moment of the first data when a judgment result shows that the second condition is met, wherein the fourth moment and the third moment form a second time interval, the first condition is the same as the second condition, and the first time interval is different from the second time interval. By means of the method, the technical problem of the prior art that when a multi-media file with certain play duration is played, skipping can only be realized by fixed duration, and therefore the realization method is not optimal is solved.

The present invention relates to the technical field of probability statistical analysis and prediction of concrete temperature fields, and discloses a bridge-ballastless track structure extreme temperature prediction method and system, so as to avoid subjectivity of the conventional experience distribution method and the cumbersome derivation process of the first-order second-moment method and to obtain a relatively preciser temperature extremum in the case of a certain amount of data. The method disclosed by the present invention comprises: forming a statistical sample by means of measured bridge-ballastless track structure temperature data; calculating firt to fourth moments of the stastical sample to obtain a statistical feature of the sample; constructing virtual distribution by means of standard regular distribution to indirectly describe a distribution condition of the sample; solving a key parameter and feature estimation of the virtual distribution; constructing an extreme state function considering an extreme temperature, and giving an exceedance probability; and calculating first to fourth moments of the extreme state function by means of a reliability indicator formula, and reversing an extreme temperature value corresponding to the exceedance probability and giving a corresponding reoccurrence period.

The invention provides a communication method and device. The method comprises: a terminal device receiving time information through a first channel, wherein the first channel is a broadcast channel and/or a control channel; wherein the time information comprises first time information and second time information, the first time information indicates a first moment when the network device sends the first reference signal, and the second time information indicates a second moment when the network device receives the second reference signal; according to the first moment, the second moment, thethird moment and the fourth moment, determining the time deviation between the terminal device and the network equipment, the third moment being the moment when the terminal device receives the firstreference signal, and the fourth moment being the moment when the terminal device sends the second reference signal. According to the time deviation correction clock, the time information is transmitted in the wireless system, so that the time information is periodically and accurately acquired for time correction, and the user experience is improved.

The invention discloses an industrial robot reliability calculating method based on fourth-moment estimation. A D-H connecting-rod coordinate system of a robot is established and a forward kinematics equation is constructed, a joint space of the robot and a connecting-rod dimensional deviation are regarded as random variables, the distance between an actual position point and an expected position point is calculated and serves as a kinematic error of the robot, the kinematic error of the robot is regarded as a random variable and first four moments are calculated, a system performance function representing the kinematics reliability of the robot is established and first four moments of the performance function are calculated, a probability density function of the system performance function is solved by utilizing a fourth-moment estimation method, and integration is conducted to obtain the reliability of the robot. According to the industrial robot reliability calculating method based on fourth-moment estimation, probability distribution information of the joint space and the connecting-rod dimensional deviation is sufficiently utilized, so a few samples are only needed to complete the reliability calculation of the robot system, the time is obviously shortened and the efficiency is improved, and the industrial robot reliability calculating method is suitable for industrial robots which are connected in series and any other rotary joint types of industrial robots.

A system, method and computer program product for constructing a volatility index by using at least one processor, the method comprising: obtaining, by at least one computing device having at least one computer processor, a universe of securities; selecting, by the at least one computing device, constituent securities at a given date; computing, by the at least one computing device, constituent returns for said constituent securities; filtering, by the at least one computing device, outliers; applying, by the at least one computing device, weighting comprising computing at least one of a second, third or fourth moment to obtain the index.

The invention discloses a client control method, a client, an electronic device, and a medium. The method comprises the following steps: sending a time synchronization request to a server, and recording a first moment of sending the time synchronization request; receiving synchronization reply information carrying second moment information returned by the server, and recording a third moment of receiving the synchronization reply information, wherein the second moment is a moment when the server receives the time synchronization request recorded by the server; obtaining a current fourth moment, and calculating a reference moment corresponding to the fourth moment according to the first moment, the second moment, the third moment and the fourth moment; and correcting the fourth moment according to the reference moment. The method, apparatus, the electronic device and the medium provided by the invention are used for solving the technical problem that the video time alignment is difficult when a plurality of cameras are combined to perform panoramic shooting in the prior art, and the technical effect of improving the time synchronization precision is realized.

The invention discloses a control method for a base station air conditioner with multiple air supply modes. The control method includes the steps that the base station air conditioner is started, a compressor works, and a second air supply opening keeps the air supply state to the first moment; if the difference value between the indoor environment temperature and the set temperature is larger than the first set value, the airflow amount is increased to the second moment, and meanwhile the air supply area and/or the air supply angle of the first air supply opening are/is adjusted; if the difference value between the indoor temperature and the set temperature is smaller than the first set value and larger than the second set value, the airflow amount is reduced to the third moment, and the air supply area and/or the air supply angle of the first air supply opening are/is adjusted again; if the difference value is smaller than the second set value at the third moment, the airflow amount of a main air way is reduced to the fourth moment, and meanwhile the air supply area and/or the air supply angle of the first air supply opening are/is adjusted again; the second air supply opening keeps in the air supply state till the difference value between the indoor environment temperature and the set temperature is equal to the third set value; and the first set value, the second set value and the third set value are successively reduced. The control method has the beneficial effects that flexibility is achieved, and precision is high.

The invention discloses an electronic device and a connecting device. The electronic device comprises a first body, a second body and a connecting device. Specifically, the first body includes a touch unit. The connecting device includes a connection body, a first moment generator and a second moment generator; the connection body enables the first body to be connected to the second body; and the first moment generator and the second moment generator are arranged inside the connection body. When an angle value is in a first predetermined threshold range, the first moment generator generates a first moment, which is used for realizing the balance with a second moment generated by the gravity of the first body; and when the angle value is greater than the maximum value of the first predetermined threshold range, the first moment generator generates a third moment and the second moment generator generates a fourth moment, wherein the third moment and the fourth moment are in balance with a fifth moment generated by a first combination force that is formed by combination of the gravity of the first body and a thrust force applied on the touch unit.

The embodiment of the invention provides a playing progress control method. The playing progress control method comprises the steps of receiving a progress adjustment operation; when the progress adjustment operation meets a first triggering condition, acquiring a first moment according to the progress adjustment operation, and using the first moment as a start of a playing progress; when the progress adjustment operation meets a second triggering condition, using a second moment as the start of the playing progress, wherein the second moment comprises a third moment corresponding to the playing progress of multimedia information when the progress adjustment operation is received, or a corresponding fourth moment after the operation time of the progress adjustment operation is increased bythe third moment; and playing the multimedia information from the start of the playing progress. According to the technical scheme provided by the embodiment of the invention, the progress before adjustment can be returned to after the playing progress is adjusted, so that the fault tolerance of progress adjustment is significantly improved, and the number of operation times and the operation time are reduced.

Mitigating errors caused by the dispersion of optical or electrical signals. Errors caused by dispersion in high frequency system are mitigated by passing a received signal through an adjustable linear filter that counteracts a channel response of a channel on which the received signal has traveled to produce an electrical signal. The adjustable linear filter has a number of coefficients. A figure of merit is calculated for the electrical signal, where the figure of merit includes the second and fourth moments of the electrical signal. The coefficients of the linear filter are adjusted based on the value of the figure of merit so as to minimize the figure of merit.

The invention provides a method and device for prolonging the service life of a heating relay, and belongs to the electronic information technological field. The method for prolonging the service lifeof the heating relay includes the following steps that: when a heating film starts heating, a heating positive relay is switched on at a first moment, a heating negative relay is switched on at a second moment, and the heating positive relay and the heating negative relay are respectively connected in series at two ends of the heating film, therefore, when the heating positive relay is switched on, the heating negative relay is not switched on, that is, an entire loop is in an open-circuit state, and the heating positive relay is not affected; when the heating film stops heating, the heatingpositive relay is switched off at a third moment, the heating negative relay is switched off at the fourth moment, and the entire loop has current when the heating positive relay is switched off; no current flows through the loop when the heating negative relay is switched off, so that the heating negative relay is not affected; and time corresponding to the first moment, the second moment, the third moment and the fourth moment is different. With the above method adopted, the service life of the heating relay can be prolonged.

The invention discloses a method for calculating a scattering statistical moment of a two-dimensional random rough surface. The method specifically comprises the following steps: utilizing a Beckmanntheory and a Gaussian moment theorem; through strict theoretical derivation, giving a calculation formula of a second moment of a scattering field, coherent and incoherent scattering intensity and a fourth moment of the scattering field. Therefore, the scattering field high-order moment can be degraded to the low-order moment. The correctness of the scattering field four-order moment function is verified. The laser intensity detection quality can be analyzed through the random rough surface scattering four-order moment function. The method can be widely applied to research of rough surface speckle detection problems in national defense and civil fields.

The invention relates to a drive method of a photoelectric display device, which comprises the following steps: firstly, displaying a first picture on a plurality of pixels at a first moment; secondly, determining the data of a second picture, wherein the second picture is predetermined to display on the pixels at a second moment later than the first moment; thirdly, displaying a clear picture on the pixels at a third moment, wherein the clear picture is the picture next to the first picture and presents a first terminal gray scale or a second terminal gray scale; fourthly, displaying an intermediate picture on the pixels at a fourth moment, wherein the third moment and the fourth moment are between the first moment and the second moment, the third moment is earlier than the fourth moment, the intermediate picture is the picture before the second picture, the gray scale presented by each pixel at the fourth moment is approximate to the gray scale predetermined to present by the same pixel at the second moment; and finally, displaying the second picture on the pixels at the second moment. The invention is capable of reducing the unconformable feeling of a user visually.

A method for improving the accuracy of UWB ranging in a firearm off-location alarm system is disclosed. The method comprises: a UWB module installed on a beacon in a firearm sends a ranging request pulse signal to a sentry box base station at a first moment, and a UWB module of the sentry box base station receives the request pulse signal at a second moment, and sends a response signal to the beacon at a third moment, the UWB module of the beacon receives the response signal at a fourth moment, and sends an end signal at a fifth moment, and the sentry box base station UWB module receives the end signal at a six moment; two-way flight time of the pulse signal between the beacon and the sentry box base station is calculated based on the first moment, the second moment, the third moment, thefourth moment, the fifth moment, and the sixth moment, so that the UWB ranging information is determined, wherein the UWB ranging information is about a distance from the beacon to the sentry box basestation; and filtering treatment is performed on the UWB ranging information data by adaptively selecting a corresponding parameter configuration based on multiple groups of different parameter configurations.

The invention relates to a counter electromotive force sum-based commutation optimization method of a brushless DC motor, and belongs to the field of motor control. The counter electromotive force sum-based commutation optimization method is used for solving the problem of large rotor position information deviation of a position sensorless motor in the prior art during position detection. The counter electromotive force sum-based commutation optimization method comprises the steps of acquiring a non-conduction phase counter electromotive force value of the brushless DC motor in each conductionstate at three fourth moment; adding numerical values of the acquired non-conduction phase counter electromotive forces in two adjacent conduction states to obtain non-conduction phase counter electromotive force sum; performing PI regulation on the non-conduction phase counter electromotive force sum to obtain duty ratio adjustment quantity; not allowing to adjust when the non-conduction phase counter electromotive force sum is zero; increasing a duty ratio when the non-conduction phase counter electromotive force sum is smaller than zero; and reducing the duty ratio when the non-conductionphase counter electromotive force sum is larger than zero. By the counter electromotive force sum-based commutation optimization method, the motor commutation accuracy is improved, no extra hardware circuit is needed, and high universality and low calculation quantity are achieved.

The invention relates to a precise time service transmission method and device applied to a wireless local area network, and the method comprises the steps: sending a first CTS instruction so as to empty a channel between a master station and a slave station; sending SYNC information data to the slave station and recording a first moment when the master station sends the SYNC information data; sending the first moment to the slave station; receiving an RTS instruction sent by the slave station, and responding a second CTS instruction to the slave station; receiving DELAY REQUSEST information sent by the slave station, and recording the fourth moment when the master station receives the DELAY REQUSEST information; sending the fourth moment to the slave station, so that the slave station calculates the path transmission delay and the clock offset of the master station slave station according to the first moment, the second moment, the third moment and the fourth moment, and then correctsthe clock of the slave station; wherein the second moment is the moment when the slave station records and receives the SYNC information data; wherein the third moment is the moment when the slave station sends DELAY REQUSEST information. The first CTS instruction is sent, and the channel between the master and the slave is emptied, so that the random delay caused by busy channels is reduced, andthe accuracy and the performance of time synchronization are improved.

A method separates a source signal from an interfering signal contain in signals received at multiple sensors. The method estimates the source signal using an adaptive filter characterized by a set of filter coefficients, which are updated by maximizing a distance of the estimated source signal from a Gaussian signal having the same variance as the source signal. In one implementation, the adaptive filter is an adaptive linear combiner. The distance of the estimated source signal from the Gaussian signal may be provided by calculating an entropy function. In one implementation, the distance from Gaussian is estimated using an expectation function involving a fourth moment and a second moment of the source signal.

The invention discloses a state detection method for a timing synchronization loop based on high-order cumulants and mainly solves the problems that the existing timing synchronization lock detection method needs a large amount of simulations to determine a decision threshold under the different channel conditions to cause poor practicability and detection performance. The method comprises the following implementation steps of receiving output data of an interpolation filter in the timing synchronization loop and carrying out power normalization processing; setting an input vector, and after each execution of the loop, utilizing data subjected to power normalization processing to update the input vector; solving secondary moments M20 and M21 and a fourth moment M42 of the input vector; computing fourth-order cumulant C42 of the input vector; and comparing an absolute value of the C42 value with the set threshold and judging whether the current timing synchronization loop is convergent to utilize a state machine to judge the working condition of the timing synchronization loop. The method overcomes the effect of Gaussian noise, the practicability and the detection performance are improved, and the method can be used for a single carrier wireless communication system.