341results about How to "Resolve synchronization" patented technology

The invention discloses a random access method which is used for realizing random access procedure, in particularly for realizing random access procedure in a secondary cell, so as to secure uplink synchronization of a user side and a network side. The method comprises the following steps: a random access preamble sequence to be sent to a cell in which random access is conducted by a current sub-frame and physical random access channel (PRACH) resource used for sending the preamble are identified by user equipment (UE); the preamble sequence is sent to an eNB on the PRACH resource; based on the PRACH resource, among K PDSCH resources used for transmitting random access response (RAR) allocated to the cell in semi-static manner, the PDSCH resource bearing RAR is identified by the UE in the cell to which the preamble sequence is sent, and then the RAR is received by the UE on the PDSCH resource; and timing advance (TA) value of the cell is obtained by the UE from the received RAR. The invention also discloses a random access device used for realizing the random access method.

The invention provides a time-resolved extreme-low-light multispectral imaging system and method and belongs to the field of extreme-low-light multispectral imaging, wherein the system is triggered through a trigger to ensure the time-resolved property, and the multispectral high-resolution two-dimensional color imaging for extreme-low-light objects is realized by combining a triggering technology of the trigger, the compressive sensing theory, a DLP (digital light processing) technology, a spectrum-dividing technology, an optical fiber coupling technology and a photon counter linear array detection technology; the system is composed of an extreme-low-light light source or self-luminous organisms, the trigger, an optical filter, an optical imaging system, a DMD (digital mirror device) micromirror array, an optical focussing and collecting system, a spectrophotometer, a photo counter lineary array consisting of a plurality of photon counters with different wavelengths, a driving control module and an optimization algorithm module; the sensitivity of the system can reach the level of a photon, and can be widely applied to the fields of self-luminous organism detection, medical treatment imaging, data acquisition, communication, astronomy, military, hyperspectral imaging, measurement in quantum mechanics and the like.

The invention discloses a multi-modal information fusion football video event detection and semantic annotation method. The multi-modal information fusion football video event detection and semantic annotation method includes the steps of detecting the event type of Internet match result report text description statements with the potential semantic analytical method; detecting football video intermediate semantic objects, dividing a site area, conducting attack-and-defense transition analysis, and determining boundaries of video event fragments; determining the match starting time according to kick-off circle and whistling detection results, and achieving initial semantic classification of attack-and-defense fragments with the Bayesian network; under the constraint of coarse-grained time information in text descriptions, achieving the football video event semantic annotation according to semantic synchronization text descriptions and video events of texts and the video fragments. By means of the method, the Internet text information and video inherent audio-visual feature analysis are fused for analyzing football videos, accuracy for detecting the video events and the boundaries of the video events is improved, the rich semantic annotation of football video contents is achieved, and a solid foundation is laid for building a video indexing mechanism based on semantics.

The invention relates to the communication field and discloses an authentication method, a network and a system of mobile ad hoc network, which ensures the realization of layer distribution type authentication scheme of cluster mobile ad hoc network; and the requirement on computer processed resources is rational, which can be realized in practical application environment. The invention adopts a group network structure of cluster mobile ad hoc network and advocates layer distribution identity authentication scheme; and the inter-cluster communication used an improved new threshold group signature protocol which improves the original threshold group signature method based on GQ and decreases power index calculation times, improves calculation parallelism and reduces the requirement on processed resources; at the time of initialization, a certificate and a sub key are issued by the system uniformly; cluster heads which have enough numbers of sub keys can jointly recover system keys, thereby carrying out the group signature to issue certificates to new added nodes and using multi-leap serial communication for realizing united group signature.

The invention provides a time-resolved single-photon counting two-dimensional imaging system and a time-resolved single-photon counting two-dimensional imaging method and belongs to the technical field of extremely-weak light detection. A trigger 2 is triggered to start sampling, centralized sampling is performed at t time intervals, and measurement and counting are performed if light comes at the intervals, so that time resolving of an extremely-weak light object is realized, and a time sequence image is generated. Imaging is performed on the basis of a compressive sensing (CS) theory, a digital micro-mirror device (DMD5) performs linear random projection on a compressible two-dimensional image, the compressible two-dimensional image is optically modulated and then synchronously detected by using a single-photon counter, and a high-resolution extremely-weak light image can be reconstructed by a small amount of sampling operation. The measurement process is linear and non-adaptive, the reconstruction process is non-linear, and the invention has the advantages of high generality, robustness, expandability, superposition and computation asymmetry, and can be widely applied to the fields of life science, medical imaging, data acquisition, communication, astronomy, military affairs, hyper-spectral imaging and quantum measurement.

This invention relates to a test method for the safety stable control system of network, which collects voltage of each node and current curve data under various disturbances to be processed by test fault scene data process software to get node data files of networks under various disturbances in a same format, which are input into the test instruments of the corresponding place of the nodes, a GPS calibrates the time and triggers them, disturbance data for selecting test instruments are configured and output to the network safety stable control devices to carry out synchronous dynamic test in different places to them.

The invention discloses an information hiding method facing to an H.264 / AVC (automatic volume control) video. The embedding of watermark information is realized through modifying a data communication terminal (DCT) coefficient of a frame I, but for a frame B and a frame P, the embedding of the hiding information is realized through modifying motion vector data (MVD), thus on one hand, the embedded watermark information can be used for authenticating the integrity of the content of the video streaming, and on the other hand, whether the video is attacked is judged, and whether the extracted information is credible and the like at an information detection end according to the integrity of the extracted watermark information, thus ensuring the safety of the private information; as the frame P and frame B in a video sequence are divided into a motion subblocks from the size range of 16*16 to 4*4; the smaller subblock division provides a large amount of MVD data which can provide for hiding the private information, thus the video has larger information hiding capacity; and the process extracting the information is simple and rapid, does not need an original video file for reference, and only needs to decode the DCT coefficient of the frame I and the MVD data of the frame B and frame P, thereby effectively improving the instantaneity and the practicability.

The invention relates to a stereo audio and video stream data coding transmission method and system based on transmission streams. The invention comprises: a. Perform camera picking up to gain binocular audio and video data before synchronous compression and multiplex respectively in synchronous control; b. respectively perform envelopment in the synchronous control for transmission stream; c. perform secondary multiplex coding in transmission stream synchronous control, so as to gain single data stream; d. follow real-time transmission protocols to perform envelopment transmission and receive feedback adjusting; f. in the transmission service quality control, the invention can perform real-time transmission protocol de-envelopment and feedback information; g. de-multiplex to gain transversal binocular audio and video data; h. in synchronous monitoring condition, perform audio and video data de-compression and de-multiplexing; i. A display apparatus realizes stereo playing. The invention supports audio and video coding, such as MPEG-1 / 2 / 4, VC1, H263, H.264 and etc, as well as such transmission methods as wireless, cable, time division multiplex, block transmission and so on. The invention can realize remote stereophonical reoccurrence of local audio / video, and is simple, universal and reliable.

The invention discloses a synchrony method and a synchro system between different media streams. The invention includes the following steps: the first corresponding relationship between the first time information and the first display time of a first media stream data packet is established; the second corresponding relationship between the second time information and the second display time of a second media stream data packet is established; according to the corresponding relationship, the first media stream media stream data packet and the second media stream data packet are displayed simultaneously when a difference value between the first display time and the second display time is less than a threshold value. The invention realizes the synchrony of different media streams from a broadcast network program or from a broadband program, and solves a synchrony of media streams from different networks, and possesses a remarkable actual application effect and significance in the modern media stream technology.

The invention relates to a parameter identification based multi-motor servo system synchronization and tracking control method. The parameter identification based multi-motor servo system synchronization and tracking control method comprises the steps that 1, a multi-motor driven servo system containing unknown parameters is analyzed, and a mathematic model of the multi-motor driven servo system containing unknown parameters is established according to a motor structure and a physical law; 2, a load model established in the step 1 is analyzed, and unknown parameters in the load are estimated by utilizing a variable-gain self-adaptive parameter identification method; 3, synchronization and tracking control is conducted on the multi-motor driven servo system by utilizing neural network integral sliding-mode control algorithm according to a parameter identification result obtained in the step 2. The control method can ensure the steady-state accuracy of synchronization and tracking, effectively ensure transient-state and steady-state performance of parameter estimation, decrease the complexity and calculated quantity of algorithm design and effectively improves the response speed and robustness of the multi-motor driven servo system.

The invention discloses a synchronous control method of a combined navigation semi-physical simulation test. According to the invention, characteristics of all branch systems in a combined navigation semi-physical simulation test system are fully considered, and a synchronous control method combining controlled quantity presetting, delay quantity evaluation and compensation and synchronization pulse triggering is used, so synchronous errors of different data sources during operation of the system are eliminated and a synchronous problem among GNSS simulation signals, inertia measurement data simulation signals and triaxial rotary table inertia posture changing excitation in a GNSS / INS ombined navigation semi-physical simulation is solved.

The invention provides a signal output method of an optical receiver area array sensor, wherein the receiver firstly identifies and responds pixel positions of useful optical signals according to space and time characters of a light source, then selectively outputs the pixel signals and removes the pixel output only responding environment light. Meanwhile, the invention introduces a synchronous sampling technology for synchronizing the output sampling of the area array sensor and the frequency of light pulse and ensuring the integrity of signals during high speed communication.

The invention provides a novel formation control algorithm for a plurality of autonomous mobile robots moving on a two-dimensional plane. According to the algorithm, each robot can independently move to a required position, so that a predetermined geometric formation can be converged. Moreover, the robot formation control algorithm provided by the invention is an optimized method obtained on the basis of a distributed method, so that the problem of wide target formation control can be solved, limit on a special target geometric formation is eliminated, and the control range is extremely wide. According to the algorithm, the convergence can be proved strictly on the aspect of mathematics, and the convergence speed is provided with an upper limit in a synchronization algorithm, so that the algorithm has higher conscientiousness than the conventional control algorithm based on experience and experiments.

The invention discloses a time difference measurement-based antenna switching type radio frequency positioning method and belongs to the technical field of radio frequency positioning. The method is characterized by comprising the following steps of: distributing positioning antennae of an antenna group in space in which the position of a reader serves as a coordinate origin, and recording the coordinate information of each positioning antenna into a host; switching and accessing different positioning antennae through an antenna switching control unit, and measuring the time interval from the moment when the reader sends a signal to the moment when the reader receives the information which is returned by a label; processing the measured data through the host to acquire the time difference of transmitting electromagnetic waves in the space when different positioning antennae are accessed, and then acquire the distance difference when the label reaches corresponding two different antennae according to the time difference, and then setting up a plurality of hyperboloid equations; and performing iterative computation on a plurality of hyperboloid equations to acquire the position coordinate of the label.

A method and a system for transmitting a D2D communication synchronization signal, a sending end, and a reception end. The method comprises: a device-to-device (D2D) sending end sending a D2D communication synchronization signal (D2DSS) on time-frequency resources preconfigured on a network side, the preconfigured time-frequency resources referring to n groups of synchronization resources reserved on a D2D transmission bandwidth and used for bearing the synchronization signal; and determining, according to the D2DSS on each group of the synchronization resources, a frequency domain position of the group of the synchronization resources in a subframe, n being a positive integer.

The invention discloses an expressway road cooperative control system and method based on deep reinforcement learning, wherein the system comprises a traffic information interaction module, a trafficcontrol module, a deep learning network training module, and a plurality of variable speed limit and ramp control units. The traffic status of ta road is obtained through the information interaction module, and then the traffic status is transmitted to the traffic control module. And the control strategy is continuously optimized through the training module, and the stability of the training process is ensured by adopting a deep reinforcement learning algorithm with an actor-critic architecture. All traffic control units in the system can be controlled at the same time, the problems of trafficstatus space explosion and the like cannot be caused, it can be guaranteed that vehicles pass through bottleneck road sections at a high speed, and passing of surrounding road vehicles cannot be affected by queuing and the like.

The invention discloses a method and device for synchronizing camera information between video monitoring platforms. The video monitoring platforms include the first platform and the subordinate second platform of the first platform. The method includes the steps that the first platform actively initiates a synchronization query; the second platform queried synchronously judges whether the number of subordinate sub-platforms of the second platform is larger than a designated threshold value; a query identifier is marked on a sub-platform camera catalog node where the number of the cameras is larger than the designated threshold value, and the camera information of the platform is reported according to the query identifier; the first platform checks whether the camera catalog node has the query identifier, a video monitoring platform corresponding to the camera catalog node having the query identifier initiates a further recursion synchronization query for the second platform if the camera catalog node has the query identifier, and otherwise, the synchronization query is over. Meanwhile, the invention discloses a device for realizing the method for synchronizing the camera information between the video monitoring platforms. Through the method and device, synchronization of the camera information of a large video monitoring system is effectively achieved.

The invention discloses a device for a rapid-heating quasi-static high-temperature Hopkinson pressure bar experiment. The device adopts the technical scheme that a sample is mounted in the middle of a ceramic sleeve at the center of a high-frequency induction heater in a shielding cover; the both ends of the sample are connected with the inner ends of two short ceramic bars; the outer ends of the two short ceramic bars are connected with one end of an incidence bar and one end of a transmission bar respectively; stress wave signals of strain gages are measured from the incidence bar and the transmission bar respectively, and sent to a computer for data processing through an electric bridge and an amplifier; the computer controls the warming of the high-frequency induction heater and the sample through a temperature controller; and the sample temperature is fed back to the temperature controller by another infrared monitor. The device overcomes the defects that the available device for the split Hopkinson pressure bar experiment is complicated in structure, complicated to operate, low in working efficiency and difficult in data processing; and the quality of the experiment is influenced seriously. The device is suitable for the Hopkinson pressure bar experiments in different laboratories, in particular to the heating of the sample and the immediate processing of the information of the strain gages.

An optical semiconductor device contains P type semiconductor substrate, P type epitaxy layer, N type cathode surface layer, optical receiving component formed of P type epitaxy layer and cathode surface layer, micro reflection mirror area formed from channel part, semiconductor laser chip fixed on bottom of channel part, and anode buried layer, so the optical receiving component having high speed action and high optical receiving sensitivity and luminous component having semiconductor laser chip can be integrated in one substrate.

The invention relates to an offline application system, and particularly relates to an offline application system based on timestamp, belonging to the technical field of communication. The offline application system based on timestamp is characterized by consisting of a local offline sub-system and a server sub-system and is also characterized by storing local business data in a local database, supporting access of a client in an offline state through a local server, finishing synchronization between the local data and the central data through a synchronous module, finishing the matching of a transport protocol through a transport module, finishing the detection of the network state of the client through a state detection module, performing data storage and server timestamp management through a central database, loading and running each module through a central server and checking the consistency between the local timestamp and the server timestamp through a timestamp verification module. The system provided by the invention solves the problems that the prior art adopts one-way transmission and the offline data can not be stored and synchronized.

The invention relates to a method and device for vehicle diagnosis. The device comprises a downloading module, an execution module and a deletion module, wherein the downloading module is used for downloading a database containing data of a vehicle model which a specified vehicle belongs to from a server device when the vehicle diagnosis is conducted on the specified vehicle; the execution module is used for conducting the vehicle diagnosis on the specified vehicle according to the downloaded database; the deletion module is used for deleting the downloaded database after the vehicle diagnosis is completed. By means of the method and device for the vehicle diagnosis, the security of the vehicle diagnosis can be enhanced.

The invention provides an electromagnetic gun. The gun tube is provided with multiple hole pairs in the vertical direction of the axis, and each hole pair is composed of two small holes arranged in the opposite side walls of the gun tube. Each copper coil, capacitors, each photoelectric triode and each light emitting diode are connected to one control circuit board; the photoelectric triode and the light emitting diode are respectively arranged in the two small holes of the hole pair of the gun tube; the copper coil wraps the hole pair of the gun tube; the control circuit board and the gun tube are erected on the capacitors; and the gun tube is internally provided with a bullet. The control circuit board is externally connected to a power supply so as to charge the capacitors. When the bullet moves to the hole pair, the control circuit board controls the capacitors to discharge electricity to the copper coil according to the change due to induction signal shielding, and the cooper coil can generate a strong magnetic field to drive the bullet to accelerate. According to the invention, a synchronization problem of multi-stage coils in an acceleration process is solved, the overheating of the coils can be reduced, and the electromagnetic gun is simple and compact in structure, is convenient to operate, is easy to adjust, is low in cost, and is high in stability and reliability.

The invention discloses a method and system for sending the multicast broadcast message and is applied in the communication technology area, the described method includes the following steps: (p1) specify the distribution tie of the data packet; (p2) send the data packets to the base station; (p3) the base station distributes the data packets after a period. The system includes contents distribution source and base station, content distribution source is used to send the data packets to the base station and specify the distribution time of the data packets. The base station is used to distribute the data packets in the specified time. The invention can solve the synchronization problems of the multicast broadcast service between the base stations and can guarantee that different base stations in one multicast broadcast area can send same multicast broadcast message at any time, so it can better support the macro sub-set.

The embodiment of the invention discloses a data synchronization method and a data synchronization apparatus. The method comprises the following steps: scanning codes so as to capture a synchronous instruction; replacing the captured synchronous instruction with a trapping instruction; when a code runs to the trapping instruction, trapping a code execution authority into a distributed shared memory (DSM) unit, wherein the DSM unit implements concurrent multi-write protocol, but the DSM unit implements a single-write protocol in the process of executing the synchronous instruction, therefore, the method supports the concurrent multi-write protocol and solves a synchronous problem caused by the concurrent multi-write protocol.

The invention discloses an SCR electronic switch for achieving synchronization of drive signals, and the electronic switch comprises a square-wave generator, a push-pull circuit, an amplification MOS tube, a fly-wheel diode, a coupling transformer, and a silicon controlled rectifier array. The square-wave generator is connected with the input end of the push-pull circuit, and the grid electrode of the amplification MOS tube is connected to the output end of the push-pull circuit. The primary side and secondary side of the coupling transformer are respectively provided with at least one primary coil and at least two secondary coils. The fly-wheel diode is in parallel connection with the primary coil of the coupling transformer, and the positive electrode of the fly-wheel diode and one end of the primary coil are respectively connected to a drain electrode of the amplification MOS tube. The negative electrode of the fly-wheel diode and the other end of the primary coil are respectively connected to one high-voltage power supply. The silicon controlled rectifier array is formed by the parallel connection of at least two silicon controlled rectifier branch circuits, wherein each silicon controlled rectifier branch circuit is formed by the series connection of at least two silicon controlled rectifiers. A high-level output end of each secondary coil of the coupling transformer is connected with the grid electrode of the corresponding silicon controlled rectifier in each silicon controlled rectifier branch circuit. The electronic switch guarantees the high synchronism of drive signals, and solves a problem of the synchronization of drive signals.

The invention relates to a segment neural network friction model based dual-motor servo system control method and belongs to the technical field of electromechanical control. The method includes: firstly, analyzing a dual-motor drive servo system with friction, and establishing a mathematical model of the dual-motor drive servo system with friction according to a mechanism modelling method as well as the structures of motors and the physical law; secondly, analyzing a friction term fi in the mode, and utilizing a segment neural network to establish a friction model of the nonlinear friction fi so as to obtain a segment neural network friction model; thirdly, utilizing a terminal sliding mode control algorithm to acquire a synchronous motor speed control law, and performing synchronous tracking control on the dual-motor servo system according to the control law. By the method, influence on the dual-motor system due to friction can be eliminated, the dual-motor system has better transient performance, tracking response speed of the dual-motor servo system is increased effectively, and fast synchronization of the dual-motor system can be guaranteed.

The present invention provides a two-dimensional code encryption transmission method and system. The method comprises the steps of (S1) the encryption module of a data input client encrypts data to be transmitted, forms an encrypted string and transmits the encrypted string to a two-dimensional code generation module, (S2) after the two-dimensional code generation module receives the encrypted string, encryption key and ciphertext, a two-dimensional code is generated and is displayed through a two-dimensional code display module, (S3) the scanning module of a data receiving client scans the two-dimensional code and analyzes the two-dimensional code into an encrypted string and transmits the encrypted string to a decryption input module, and (S4) the decryption input module decrypts the encrypted string and writes the decrypted two-dimensional code data into the database of a receiving client. According to the two-dimensional code encryption transmission method and system, the two-dimensional code is used for the transmission of few encryption information, and through the encryption of the two-dimensional code data, the real-time data synchronization of an internetwork application system database of internal and external physical isolation is realized.

The invention provides a network switching method and system during conversation service processing. The network switching method comprises that when a first terminal determines that the conversation process of a second terminal needs to be changed from the first network to the second network, the same conversation data is sent to the second terminal via the first network and the second network simultaneously; an IP multimedia subsystem, to which the second terminal belongs, receives the conversation data sent from the first terminal, and back feeds data synchronization information to a base station; the base station determines whether the conversation data is synchronized according to the data synchronization information, and if not, the data synchronization information is sent to an access point; according to the data synchronization information, the access point and / or the base station adjust(s) transmission resource distributed to the first terminal, so that the conversation data, which is sent from the first terminal to the second terminal via the first network and the second network, is synchronized; and when the base station determines that the data synchronization information is synchronized, the first terminal is notified to disconnect from a network entity of the first network, and network switching is completed.

The invention relates to a method for playing a song and lyrics dynamically at the same time. The method is as follows: when an audio file in a mobile terminal is needed to be played, the mobile terminal analyzes the audio file, obtains parameters of the audio file to be played and sent the parameters to a lyrics server device; then the lyrics server device searches a lyrics file corresponding to the parameters in a data base and sends the found lyrics file to the mobile terminal for receiving and displaying the lyrics. The invention also provides a mobile terminal and a lyrics server device for implementing the method, wherein the mobile terminal comprises a communication module, a display module and a file processing module; the lyrics server device comprises a communication module, a searching module and a data base module. The method solves the problem of synchronous playing the song and lyrics even if the lyrics are not available beforehand, thereby saving the storage space of the mobile terminal.

A synchronization channel transmission method and system for D2D communication, a transmit end and a receive end. The system comprises: a transmit end and a receive end. The transmit end comprises a generation module and a transmit module and is used for transmitting a D2DSS and a PD2DSCH. The receive end comprising a receive module and a processing module and is used for receiving the D2DSS and the PD2DSCH. When the PD2DSCH is transmitted, a frequency-domain position of the PD2DSCH in a sub-frame is consistent with a frequency-domain position of the D2DSS in the sub-frame, or the frequency-domain position of the PD2DSCH in the sub-frame is determined by the D2DSS. When the PD2DSCH is received, the PD2DSCH is received at a frequency-domain position the same as a frequency-domain position of the D2DSS, or the PD2DSCH is received at a frequency-domain position determined by the D2DSS.