317results about How to "Sync fast" patented technology

High speed differential copy can be implemented in the fail-back after disaster recovery when the data of the primary site is protected safely. When a restore command is issued, the common snapshots of the snapshots of the primary site and the secondary site are extracted as the base snapshot by comparing the log tables of the primary site and secondary site. The volume of the primary site is rolled back with the extracted snapshots. The latest snapshot of the volume of the secondary site is transmitted to the primary site and it is applied to the volume of the primary site to synchronize the volumes of the primary site and the secondary site.

A method and apparatus for synchronizing multimedia content with a client device which supports a multi-server environment are provided. The server includes a synchronization policy management unit which acquires a synchronization policy; a synchronization information collector which collects log information of a previously performed synchronization and of a change occurring after the previously performed synchronization; a synchronization processor which performs synchronization in accordance with the collected log information; a change log management unit which stores a result of the synchronization; an interface unit which transmits the log information; and a storage unit which stores the multimedia content and the meta data of the multimedia content. The method includes acquiring a synchronization policy; collecting log information of a previous synchronization; performing synchronization with the client based on the collected log information; storing a result of the synchronization in the log information.

A business application integrates a company's internal business systems with an e-commerce web site, so that company personnel can manage their business with a business application that seamlessly exports relevant, up-to-date data to a web site designed to interact with customers across the Web. The business application provides business functions for manipulating merchandising data stored in a merchandising database. In addition, to accommodate an intermittent connection to the Internet or otherwise to the web hosting server, the business application supports the generation of a replica, from the merchandising database, that can be exported to a web hosting server. A web application executing at the web hosting server generates web pages based on merchandising data stored in the partial replica. The customer can provide feedback, possibly representing purchase orders or customer information changes, for example, that can be automatically entered into the company's business system. Alternatively, the customer can download a client replica, generated from the partial replica at the web hosting server, for use during periods of disconnection from the web hosting server. Thereafter, the client replica and the partial replica can be synchronized to update each other with modified data. Furthermore, the partial replica and the merchandising database can also be synchronized.

A system and method for fast synchronization of an incoming signal with a UWB receiver rapidly. The present invention synchronizes with a UWB receiver with an incoming signal. The present invention correlates a local pulse generated at the receiver with the incoming signal, finds a phase angle in the correlation function that would correspond to a high signal to noise ratio, thereby matching the receiver to the incoming signal phase, and operates the receiver at that phase. Exemplary options of fast synchronization include using multiple detection arms to compare one parameter of the correlation function to a predetermined threshold.

A method for synchronizing a reception time point of a UL DPCH signal to a previously expected time point when the reception time point of the UL DPCH signal received from a UE is different from the previously expected time point by a Node B, wherein the Node B transmits a DL DPCH signal to the UE at a time point assigned to the UE on a basis of a reference time point of the Node B, and the DL DPCH signal includes a stream of TAB bits for uplink synchronization control. The method comprises measuring a difference between the reception time point of the UP DPCH signal and the expected time point; transmitting information for maintaining a transmission time of the UL DPCH signal previously transmitted by the UE to the UE using the TAB bits, when there is a difference between a lower limit value and an upper limit value, determined by the number of the TAB bits of the DL DPCH signal received by the UE; transmitting information for advancing a transmission time of the previously transmitted UL DPCH signal as much as a set unit determined by the number of the TAB bits using the TAB bits, when the difference is larger than or equal to the upper limit value; and transmitting information for delaying a transmission time of the previously transmitted UL DPCH signal as much as the set unit using the TAB bits, when the difference is less than the lower limit value.

The invention discloses an engine position management system. The engine position management system comprises a crankshaft signal panel, a crankshaft position sensor, a camshaft signal panel, a camshaft position sensor and an eTPU control unit, wherein the crankshaft signal panel comprises multiple convex teeth and tooth gaps; the tooth gaps have a large tooth gap for positioning; and the camshaft signal panel comprises three convex teeth with different central angles and tooth gaps. The eTPU control unit comprises a crankshaft signal processing module, a crankshaft fault diagnosis module, a camshaft signal processing module, a camshaft fault diagnosis module and a limp return and synchronous logic processing module. The engine position management system can use crankshaft signals and camshaft signals for realizing quick cylinder judgment and synchronization of an engine when the camshaft position sensor and the camshaft position sensor are normal, and can use another sensor for realizing the cylinder judgment synchronization and providing the angle information with limited precision to realize the limb return of the engine when one sensor is broken down. The invention further provides a management method of the engine position management system.

The invention discloses a satellite-ground synchronization method for an on-satellite processing beam-hopping satellite communication system, and belongs to the technical field of satellite communication. By periodically inserting the beam hopping plan corresponding to the beam position into the downlink frame, the ground terminal can be effectively assisted to realize the fast access of the uplink in the beam hopping environment. In addition, in combination with the working principle of the phased-array antenna, the satellite-borne time transmission method oriented to phased-array antenna beam hopping application is provided, and the time reference consistency among multiple phased-array antennas and between each wave position receiving beam and each wave position transmitting beam is effectively ensured. The synchronous control time sequence of the phased-array antenna is provided, the beam switching serial data and the wave speed switching control pulse signal are separately transmitted, the beam switching serial data are sent in advance before the beam switch control pulse is sent, the protection time in the beam switching process is shortened, and the transmission efficiency of the beam hopping application is effectively improved.

The invention relates to a massive data synchronization system and method. The synchronization system comprises an incremental data input interface, a full data input interface, a storage module, a filter module and a data output interface, wherein the incremental data input interface is used for receiving the incremental data of the changed data of a resource system from an incremental data interface of the resource system, and the full data input interface is used for calling a full data interface of a target system and receiving a full data identification code from the target system; the storage module is used for storing the received incremental data and full data identification code, and the filter module is used for filtering the incremental data based on the full data identification code, and using the incremental data corresponding to the full data identification code as filtered data; and the data output interface is used for submitting the filtered data as synchronous data to a synchronous data interface of the target system, and the filtered data is stored in the target system. Through the system and the method, the massive data can be synchronized efficiently, reliably and fast.

The invention discloses an HLA-based distributed simulation support platform and an implementation method thereof, which are designed to solve the defects of the conventional HLA distributed simulation system in terms of operating performance and communication flow. The HLA-based distributed simulation support platform comprises a high-performance computing cluster compatible RTI (Run-Time Infrastructure) system unit, a reflective memory network and a federate deployment module, and provides HLA interface specification-based service for a simulation model. The implementation method for the HLA-based distributed simulation support platform is as follows: an interface function library provides service requests for federates via an RTI ambassador process, and federate processes submit the requests to an RTI via an RTI ambassador; the federates are interconnected and interoperated in a local area network, and a local RTI server centrally carries out management and communication. The invention achieves the state that the whole simulation federates can coordinatively advance, and increases the efficiency of distributed simulation; and the reflective memory network accelerates data synchronization.

The invention relates to a distributed buffer memory strategy adaptive switching method based on machine learning and a system thereof. The method comprise the following steps: carrying out evaluation on each buffer memory strategy based on a reference test, and confirming scene elements influencing buffer memory strategy performance appearance; collecting data set of each buffer memory strategy under different scene elements conditions; training the data set to obtain a buffer memory performance model; and deciding an optimal buffer memory strategy based on buffer memory performance model and on-line monitoring data in cluster environment, and executing buffer memory strategy switching when present buffer memory strategy is inconsistent with the optimal strategy. In the invention, machine learning method is employed to establish the buffer memory performance model which can accurately describes present scene, the model is updated periodically through constructing a performance data warehouse to improve the precision of the model further. Thus the distributed buffer memory strategy adaptive switching method in the invention is adapted to environmental dynamic change well to enhance flexibility and adaptability of buffer memory service.

A method, system, and computer-readable medium to quickly synchronize copies of data that have diverged over time. The present invention can be used in synchronizing replicated copies of data that have become unsynchronized due to the restoration of primary data from a backup copy of the primary data. The solution enables copies of data to be synchronized without copying all of the data from one copy to another. The solution uses minimal resources to maintain data consistency and has minimal effect on performance of applications using the data and on network usage. The method includes determining that a change occurred to data in a region of a primary volume without including the region in a set of regions designated for replication to a secondary volume. The region is added to the set of regions designated for replication to the secondary volume and replicated.

A radio transmission system including many radio transmitters using frequency hopping carriers to intermittently transmit very short messages indicative of status of stimuli associated with the transmitters. The transmitters transmit transmissions independently of a receiver receiving the transmissions and independent of each other. In operation, radio transmitters transmit messages at varying frequencies at time intervals that can be varied as well. The frequency and time intervals are varied according to patterns that can be determined individually for each transmitter. A receiver holds data indicative of the future transmission frequency and time for each transmitter and updates the data based on the time and the content of the received messages. In addition, a simple method is provided to generate a very large number of orthogonal frequency-time hopping sequences that are individual for each transmitter and based on the transmitter ID. The problem of transmission of urgent messages is solved by transmitting urgent transmissions at transmission opportunities having precise time and frequencies that, advantageously, are in relations with the routine transmissions. The problem of power-up synchronization in such system is solved by rapidly transmitting, at transmission opportunities, a sequence of synchronization transmissions that carry information about the time and the frequency of a future routine transmission.

A chaotic communication system employs transmitting and receiving chaotic oscillating circuits. In an embodiment of the invention employing a Chua circuit as the basic chaotic circuit, the transmitter has a tank circuit portion and a Chua diode portion linked through a resistance. The capacitance of the tank circuit is varied by selectively switching in and out of the tank circuit an auxiliary capacitance isolated by an optoisolator. Switching of the optosiolator is controlled by an information signal to generate a perturbed oscillation in the transmitting circuit. A voltage is tapped from the Chua diode circuit and transmitted to carry the information from the information signal. A receiver in another embodiment applies the transmitted signal to both the tank circuit and Chua diode portions of the receiving circuit. The transmitted signal is applied through a resistor to the Chua diode portion as well as the tank circuit portion. By applying the received signal to the Chua diode portion as well as the tank circuit, synchronization of the transmitter with the receiver is accelerated substantially. In still another embodiment, the tank circuit components are varied to generate a vocabulary of chaotic signals that can be decoded by various receiver embodiments that are described.

The embodiment of the invention provides an asynchronous replication method, a device and a system. The method comprises that a main data center receives a write request that is emitted by a user device and comprises to-be-written data; object metadata and object data corresponding to the to-be-written data are generated and stored, wherein the object metadata comprises an object identity and the object data is equal to the to-be-written data; a first synchronous message is sent to a backup data center and comprises the object metadata; a synchronous request emitted by the backup data center is received and comprises the object identity; and a second synchronous message is sent to the backup data center according to the synchronous message and comprises the object data corresponding to the object identity contained in the synchronous message. The method overcomes the problem that time of object access in the backup data center by a user is uncontrollable.

To efficiently transmit frame relay packets between terrestrial frame relay networks (10, 12) over a satellite/wireless network (14), the packets are processed by frame relay processors (16, 18) at both ends of the satellite/wireless network (14). Variable length frame relay packets are segmented into smaller packets called spackets. The system utilizes priority queueing and a scheduler (24) transmits the spackets over the satellite/wireless link. To enhance the quality of the satellite/wireless link, each frame contains a variable number of Reed-Solomon (RS) check bytes used for error correction. Further, several frames are interleaved before transmission over the satellite/wireless link to spread the effect of burst errors over several frames. Additionally, a header compression technique saves bandwidth by compressing a Virtual Circuit (VC) identifier of the frame relay packet into a smaller value and maps the VCs to a value as specified by the size of the compressed VC field.

The invention relates to a method for synchronizing a first clock C to a reference clock A, the first clock C being connected to said reference clock A via a processing unit B. The invention moreover relates to a processing unit B and to a synchronization system. In order to enable a synchronization of said first clock C to said reference clock A via said processing, unti B. it is proposed that the processing unit B generates a correction message cmsg for the first clock C based on timestamps exchanged between the processing unit B and the reference clock A, which exchanged of timestamps is triggered by clock pulses cclk received in the processing unit B from the first clock C.

A telemetry system includes many radio transmitters using frequency hopping carriers to intermittently transmit transmissions indicative of status of sensors associated with the transmitters. The transmitters transmit transmissions independently of a receiver receiving the transmissions and independently of each other. The carrier frequency and the time between transmissions are changed according to a frequency-time hopping sequence that is different for each transmitter. The sequences and the resulting frequency ad time hopping are predictable and can be reproduced in the receiver based on the transmitter ID number. The system also includes one or more receivers containing a plurality of memory registers to hold, simultaneously for each transmitter, digital data indicative of (a) expected time and (b) expected frequency of the next transmission occurrence. The data is updated based on the time and the content of the received transmissions. The receiver authenticates the received transmissions by discriminating transmissions received at a wrong frequency and time. In addition, each transmitter encrypts the transmission using a variable encryption key that is varied with each transmission. The key variations are based on the frequency and time hopping sequence and are different for each transmitter. Alternatively, prior to encryption, each transmitter modifies data for transmission, using a modifier that is varied based on the frequency and time hopping sequence that is different for each transmitter. In addition, for faster acquisition and robust operation, the receiver includes and RSSI circuit based on FFT to detect transmitted carrier power at several different frequencies. The receiver also includes one or more frequency selective circuits that are tuned in response to the outputs from FFT and the status of the time and frequency registers.

The embodiment of the invention discloses a data modification and synchronization method, apparatus and device and a storage medium of a block chain. The data modification method of the block chain isapplied to inspect the inspection node in the block chain network. The method comprises the following steps: the inspection node obtains at least one synchronization block from an ordinary node, andthe synchronization block is an ordinary block; The checking node checks the data of the synchronous block according to the set modification rules to determine the target modification data; The inspection node modifies the target modification data; The checking node generates a checkpoint according to the synchronization block, and calculates and generates a checkpoint mark according to the data of the synchronization block. The checking node associates the checkpoint identifier with the synchronization block for recording; The checking node confirms the checkpoint identification by the checking node in the checking block chain network for storing in the checking block. A synchronization block is used for synchronous downloading of a common node. Through the technical proposal provided bythe embodiment of the invention, harmful data can be removed from the block chain.