388 results about "Synchronization algorithm" patented technology

Integrated surface-subsurface modeling has been shown to have a critical impact on field development and optimization. Integrated models are often necessary to analyze properly the pressure interaction between a reservoir and a constrained surface facility network, or to predict the behavior of several fields, which may have different fluid compositions, sharing a common surface facility. The latter is gaining a tremendous significance in recent deepwater field development. These applications require an integrated solution with the following capabilities: * to balance a surface network model with a reservoir simulation model in a robust and efficient manner. * To couple multiple reservoir models, production and injection networks, synchronising their advancement through time. * To allow the reservoir and surface network models to use their own independent fluid descriptions (black oil or compositional descriptions with differing sets of pseudo-components). * To apply global production and injection constraints to the coupled system (including the transfer of re-injection fluids between reservoirs). In this paper we describe a general-purpose multi-platform reservoir and network coupling controller having all the above features. The controller communicates with a selection of reservoir simulators and surface network simulators via an open message-passing interface. It manages the balancing of the reservoirs and surface networks, and synchronizes their advancement through time. The controller also applies the global production and injection constraints, and converts the hydrocarbon fluid streams between the different sets of pseudo-components used in the simulation models. The controller's coupling and synchronization algorithms are described, and example applications are provided. The flexibility of the controller's open interface makes it possible to plug in further modules (to perform optimization, for example) and additional simulators.

The subject invention relates to integrating agents, control logic, and simulations in order to simulate and validate a control strategy for a physical system. The systems and methods integrate agents and control logic with simulations, and utilize the integrated agents, control logic, and simulations to generate a proxy. The proxy can be employed to couple one or more controllers executing the agents and control logic with the simulations. Visualization is utilized to visualize the simulation, including the agents and the control logic. In addition, the systems and methods utilize a synchronization algorithm to synchronize the execution times of the controllers and the simulations. The foregoing mitigates validation through building and testing physical system and / or test beds. Upon validating control strategies, associated agents and logic can be loaded in one or more industrial controllers controlling the physical system, and the simulation can be utilized to represent the physical system.

A host system is provided with a shared resource (such as work queues and completion queues); multiple processors arranged to access the shared resource; and an operating system arranged to allow multiple processors to perform work on the shared resource concurrently while supporting updates of the shared resource. Such an operating system may comprise a synchronization algorithm for synchronizing multiple threads of operation with a single thread so as to achieve mutual exclusion between multiple threads performing work on the shared resource and a single thread updating or changing the state of the shared resource without requiring serialization of all threads.

The method comprises: newly adding a communication scheduling layer into original data link layer of Ethernet; in relation to the standard channel using TCP / IP, newly adding a real time channel; according to the greatest common divisor of control cycle in the actual control area, using a three segmentation dividing principal to divide macro cycle into three time segmentations on time axis; the bus arbitration uses a approach of combining the distribution with the concentration, and uses a time slot distribution based scheduling approach to send the cyclic data relating to the realization of control function in the time segmentation, uses the centralized scheduling approach with priority controlling function to send the system data and non cyclic data in the time segmentation; all slave devices in the system keep the time consistence with the master device by using a clock synchronous algorithm; the logic addressing is made based on the device ID; realizing the real time Ethernet determinacy communication.

The invention provides a hierarchical structure based wireless sensor network time synchronization method. According to the hierarchical structure based wireless sensor network time synchronization method, gateway nodes and aggregation nodes are distributed in a monitoring site in advance and sensor nodes are carried by operators; the gateway nodes send hierarchy establishment broadcast data packages with time stamps; the aggregation nodes and the sensor nodes within the communication distance range extract hierarchy information after receiving the data packages, hierarchies of the aggregation nodes and the sensor nodes are changed by adding one to the current hierarchies, and local clocks are modified according to the time stamps; the gateway nodes are served as global time after network hierarchies are built, the timed polling sends time synchronization data packages to aggregation sub-nodes and the aggregation nodes synchronize the local clock time and the global time through the time synchronization algorithm; the sensor nodes perform time synchronization on the local clocks by intercepting time synchronization mutual data package information. The hierarchical structure based wireless sensor network time synchronization method achieves high accuracy time synchronization and improves the wireless sensor network channel utilization rate and the network life cycle.

The invention discloses a method for connecting to WIFI (Wireless Fidelity) by NFC (Near Field Communication). The method comprises the steps that mobile terminal equipment is close to an NFC label, the NFC label is activated, an application program which is prestored in the NFC label is installed in the mobile terminal equipment, the NFC label starts a synchronization algorithm which is synchronized by events, a plurality of groups of dynamic passwords are generated to be sent to the mobile terminal equipment, the mobile terminal equipment sends the obtained dynamic password data package to a WIFI router, a synchronization algorithm which is operated in a dynamic password decoding module built-in the WIFI router is consistent with the synchronization algorithm in the NFC label, base band information which is received is dynamically decoded, an SSID (Service Set Identifier) and a login password of a WIFI hot spot are decoded, a communication channel between the mobile terminal equipment and the WIFI hot spot is built, and the interconnection and the data interaction of two pieces of equipment are completed. According to the method, a user does not need to input a password when WIFI connection is carried out, and the WIFI can be connected by a dynamic password mode through an NFC technology.

The embodiment of the invention discloses a method for implementing a network scalability block chain, which comprises the following steps: slicing and leadership election, consensus synchronization based on slicing leadership, reputation evaluation mechanism and global synchronization algorithm. The embodiment of the invention proposes a parallel chain structure, which separates the transaction and the consensus into two chains, so as to improve the scalability of the block chain network. The consensus part is carried out in the reputation chain. The network of reputation chain pays attentionto the security and supports the high-speed transaction of the network of transaction chain with proper speed. Based on the advantages of the reputation evaluation mechanism, the embodiment of the invention proposes a network slicing method based on the reputation evaluation mechanism. After the network slicing, the honest and excellent performance node has a greater probability to become the leader of the slicing, so as to realize the high throughput of the network without reducing the safety of the block chain network.

The invention discloses a jamming perception self-adaption blending MAC protocol which is suitable for a wireless sensor network and belongs to the field of computer networking technology. In the low loading network situation, a node runs the CSMAMAC protocol at the normal working condition; when the network has burst data or detects the jamming nearby the node of a bottleneck, a TDMA mechanism is embedded in the jamming area in a self-adaption way; the node of the jamming area runs the local TDMAMA protocol; and after the jamming releases, the node recovers the normal working condition and runs the CSMAMAC protocol. The invention detects the jamming according to the local information and does not need any synchronization algorithm; according to the jamming degree, the local TDMA is embedded in the CSMA network in a self-adaption way so that performance indexes such as the throughout capacity, packet loss rate and time delay and the like are improved and the performance of the network is increased.

The invention discloses a method and system for ensuring streaming media service quality. The method comprises the steps of monitoring the performance of a current network and triggering switch when monitoring that the performance of the current network is insufficient to meet the demands on the service quality of steaming media service; determining a target network, notifying a mobile node aboutthe relevant information for switching the target network, and sending service quality parameter information of the steaming media service of the mobile node to a target service quality proxy functionmodule in a target network node from an original service quality proxy function module in the original access network node; using the target service quality proxy function module in the target network node for establishing service quality mapping; and adopting different switch strategies according to different types of the mobile nodes: adopting a synchronous algorithm for carrying out data transmission when the mobile node is dual interfaces and adopting the switch strategy based on cache when the mobile node is a single interface. The method and the system can avoid the problem of low datatransmission efficiency due to the use of dual network interface cards in the prior art, lead a plurality of access modes to work cooperatively and realize seamless switch.

A method is provided for iteratively reconstructing an image of an object. The method includes accessing measurement data associated with the image, and using a simultaneous algorithm to reconstruct the image. Using the simultaneous algorithm to reconstruct the image includes determining a scaling factor that is voxel-dependent, and applying the voxel-dependent scaling factor to a gradient of an objective function to reconstruct the image.

The invention provides a centralized method for realizing 1588 time synchronization on a distributed system, and relates to the field of 1588 time synchronization. The method comprises: a master clock node sending a synchronization message, carrying t1 and t1'-t1, t1' being time when a same node wire board sends the synchronization message, a slave clock node receiving the synchronization message, marking t2' and t2, calculating a synchronization message correction time delay value; the slave clock node sending a delay request message, carrying t3 and t3'-t3, t3' being the time when the same node wire board sends the delay request message, receiving the delay request message by the master clock node, marking t4' and t4, calculating a delay request message corrected delay value, inserting the delay request message corrected delay value and the t4 into a delay response message, sending to the slave clock node, the slave clock node obtaining all timestamps and two corrected delay values, through a time synchronization algorithm, completing time synchronization. The method can reduce development and debugging workload, simplifies backboard wiring, reduces synchronizing signal interference, and shows for the external by integrated time source information.

A method for realizing frequency synchronization in orthogonal FDM system features the combination of the fraction in orthogonal FDM system features the combination of the fraction multiplying synchronization with integer multiplying one, and includes such steps as frequency tracking before FFT, estimating fraction multiplying frequency shift, preliminary correcting, then capturing the frequency, estimating integer multiplying frequency shift, and fine frequency correction by discrete Fourier transformation and serial-parallel conversion. Its advantage is high synchronization precision.

The invention provides a sampling value transmission and synchronization method with a path delay measurement function. The method of the invention comprises the steps of measuring data exchange delay on a switch of a process layer and synchronizing a message on IED equipment. According to the method of the invention, by measuring the data exchange delay on the switch of the process layer, uncertain dynamic delay of storage, queuing, forwarding and cascading of sampling value data in the switch is accurately accumulated and packaged into a sampling value message, and a compensation parameter is provided for a synchronization algorithm of the IED equipment; and in addition, the data structure of the existing sampling value message is expanded, a transmission delay correction field is added, and the position and length of the correction field can be configured. Transmission delay from a merging unit to a protection device is stored in the correction field, which enables the IED equipment to parse the parameter and apply the parameter to the synchronization algorithm after receiving the sampling value message.

The invention discloses a coding orthogonal frequency division multiplexing wireless signal receiving and processing device and a processing method thereof. The device comprises a receiving synchronizer, a channel equalizer and a decoder. The receiving synchronizer comprises a frame detection module, a time domain decimal frequency offset rectifying module, a sign timing rectifying module, a frequency rectifying module, a Fourier transform module, an integer frequency offset estimation module, a pilot frequency extraction module, a frequency domain decimal frequency offset estimation module, a sign timing offset estimation module, an inherent spurious frequency offset tracking module and a sampling frequency offset rectifying module. The receiving synchronizer comprehensively takes the effects of carrier synchronization offset, carrier phase offset, sampling interval offset, sampling timing offset and orthogonal frequency division multiplexing (OFDM) sign timing offset on OFDM signal demodulation into consideration to design a receiving synchronization algorithm from the three aspects of carrier synchronization, sign timing synchronization and sampling synchronization. The coding orthogonal frequency division multiplexing wireless signal receiving and processing device further has the advantages of being high in video definition, small in transmission delay, strong in interference resistance, high in reliability and the like. The invention further discloses the processing method of the device.

The invention, aiming at an OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system, provides a timing synchronization algorithm which can be easily and simply implemented in a receiver. A 62-point frequency domain ZC (Zadoff-Chu)sequence is generated by a generation formula of a frequency domain ZC sequence, two ends of the generated sequence are added with 33 zeros, then, three zeros are inserted between neighboring points so as to expand the sequence to have 512 points, and synchronization sequence obtained by performing IFFT (Inverse Fast Fourier Transform) is usedas a synchronizing signal of the OFDM wireless communication system; the receiver firstly quantifies the received synchronization sequence, then, performs conjugated correlation with a local synchronization sequence, and simultaneously, calculates a cross correlation coefficient amplitude based on sum of absolute values of a real part and an imaginary part. In this way, the correlation operation and the cross correlation coefficient amplitude calculation only contain addition and subtraction, use of a multiplying unit is avoided, operation complexity is greatly reduced, processing efficiency is improved and resource is saved, so that the timing synchronization of the receiver can be implemented easily and simply, and can be implemented more effectively on receiver hardware.

The invention discloses an adaptive free space optical communication (FSO)-orthogonal frequency division multiplexing (OFDM) transmission system. The transmission system comprises an adaptive orthogonal frequency division multiplexing (AOFDM) transmission part, an optical up-conversion module, an optical down-conversion module and an AOFDM receiving part which are sequentially connected. An adaptive FSO-OFDM transmission method of the invention has the advantages of expanding a carrier deviation estimation range and simultaneously solving problems on the estimation of carrier deviations underthe condition of inconsistency of each carrier deviation caused by the frequency-selective fading characteristic of an atmosphere channel by adopting a high-order cumulant-based carrier blind-synchronization algorithm, providing an effective way for improving a transmission rate and reducing the bit error rate of the system for free space optical communication by realizing the modeling of the optimal adaptive FSO-OFDM transmission system with maximum transmission capacity, and providing novel methods and theoretical bases for further improving the transmission efficiency of the adaptive system and improving system performance by adopting high-order cumulant-based blind channel estimation and blind signal detection technology.

The invention discloses a scheme for implementing carrier synchronization ultra wide-band (CS-UWB) signals. In the scheme, a UWB system comprises a time-hopping phase modulation module, a pulse formation module, a carrier modulation module and a filter module. By providing a CS-UWB implementation method capable of conducting the time-hopping / cycle synchronized modulation on information sequences and thus generating CS-UWB sending signals, the invention can greatly reduce the complexity of synchronization algorithms at a receiving terminal, improve the receiving performance of the UWB system and can be widely applied to the field of short-distance wireless communication.

The invention provides a method and a device for receiving a preamble, in view of at least one time domain symbol with a predetermined three-section time domain structure. The method and the device are characterized in that a preliminary timing synchronization mode comprises: by using a unique processing relationship and / or modulation relationship between the predetermined three-section time domain structures, delayed slip autocorrelation is carried out to acquire one group or multiple groups of cumulative correlation values; based on the one group or multiple groups of cumulative correlation values, after delay relationship matching and / or unique predetermined mathematical operation are / is carried out, an operation value is used for preliminary timing synchronization. As the method and the device are in view of at least one time domain symbol with a predetermined three-section structure, timing synchronization is carried out by using the delay relationship matching and / or the predetermined mathematical operation based on the three-section relationship between multiple time domain signals, the performance can be enhanced maximally, the timing synchronization algorithm is universal, and the complexity is low.

The invention discloses a synchronization method for a single carrier frequency domain equalization system, which comprises a multiplex technique and a bit synchronization method based on training characters. According to the method, three training characters are added at a frame head and used for completing various types of synchronization and signaling estimation algorithm, so that the load of the frame head is lowered, and effective transmission rate of data is improved. The invention discloses bit synchronization algorithm, and the algorithm is divided into an initial synchronism and accurate synchronization, after the range of the initial synchronism is confirmed, an accurate synchronization position is found out in the range by adopting accurate synchronization method, compared with a conventional bit synchronization method, other peak value of the algorithm can not exist out the range of the initial synchronization, and the algorithm has more accurate bit synchronization position judegement ability and has more high working efficiency.

The invention provides a method for a blockchain data authentication system. A blockchain network node module realizes a blockchain technology through utilization of a cryptography technology, a P2P network, a consensus algorithm, a synchronization algorithm and the like and provides a RPC interface for interaction with an interface module. The interface (API) module provides interfaces such as adata insertion interface, a query interface and an authentication interface for a blockchain account registration module, a blockchain browser module, a blockchain data input module, a blockchain dataquery module and a wallet module (an APP and a client). The blockchain account registration module provides a system employing entry for a user and registers user information with a blockchain. The blockchain browser module provides an open transparent query function for the user. The blockchain data input module adds authoritative data to the blockchain. The blockchain data query module determines whether data exists or not by querying keywords and provides authoritative authentication. The wallet module provides convenient key management, account management and key backup and restoration functions for the user. The system is high in security, low in resource occupation rate and high in user experience.

A system for electronic medication administration records comprising a cart station located at a skilled nursing facility, administration web pages, and a healthcare server not located at the skilled nursing facility. The cart station utilizes a plan builder algorithm to build a plan for each patient based on data contained in the cart station database. The plan comprises a list of the patient's procedures for a given day and information indicating whether such procedures have been completed. The cart station utilizes a plan runner algorithm to maintain and update the plan for each patient. The administration web pages allow an administrator to manage utilization of the system. The healthcare server and the cart station utilize a synchronization algorithm to maintain accurate and timely data for all of the skilled nursing facilities that use the system. A method of maintaining electronic medication administration records using the system described above.

A system and method for eliminating synchronization errors using speech recognition. Using separate audio and visual speech recognition techniques, the inventive system and method identifies visemes, or visual cues which are indicative of articulatory type, in the video content, and identifies phones and their articulatory types in the audio content. Once the two recognition techniques have been applied, the outputs are compared to determine the relative alignment and, if not aligned, a synchronization algorithm is applied to time-adjust one or both of the audio and the visual streams in order to achieve synchronization.

The invention discloses a self-adaptive bandwidth transmitting and playing method based on audio and video frequency synchronization, and relates to a video data transmission processing technology of a public mobile communication device. The method comprises the steps: generating a video stream data according to an H.264 coding; dynamically adjusting size of transmitted data quantity in real time according to the condition of current wireless bandwidth, transmitting the data to an outer network server via a wireless network; receiving and displaying audio and video data received by a client; creating an audio and video data buffer area, displaying and playing the video by a certain playing strategy according to the speed of receiving data quantity, and ensuring synchronization of the real-time video and audio frequency through an audio and video synchronization algorithm in an entire process. According to the method disclosed by the invention, operation and maintenance efficiency is improved; manpower cost is reduced; the video can be detected in real time; the problem of vibration of the wireless bandwidth is solved; the audio and video are synchronous, and the method has the advantages of strong generality, strong transportability and flexible expansibility.

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) time synchronization algorithm based on a conjugate symmetric sequence. The OFDM time synchronization algorithm comprises the steps of constructing a sequence with conjugate symmetry; carrying out symmetric related calculation at a receiving end by using the conjugate symmetry of the sequence so as to obtain a related peak value of a timing measurement function; and determining a beginning position of an OFDM signal by using the position of the related peak value so as to finish time synchronization. By using the invention, the adverse effect on the time synchronization, caused by a cyclic prefix and the conjugate symmetry of the sequence, is overcome, and higher timing accuracy is obtained; and the OFDM time synchronization algorithm based on the conjugate symmetric sequence, provided by the invention, can be effectively used for the time synchronization of the OFDM system under a multipath channel.

The invention discloses a synchronization method suitable for a broadband wireless communication system. A synchronous sequence with a special repetitive structure is generated by multiplying a certain section of an original repetitive structure synchronous sequence by a spread spectrum sequence; the receiving end multiplies the received time domain sampling signal by the same spread spectrum sequence of the transmitting end for despreading, then calculates a delay autocorrelation function of the received signal, and realizes symbol timing synchronization and frequency offset estimation through peak detection of the delay autocorrelation function; In the process, the precision of symbol timing and frequency offset estimation is ensured by repeating the structure delay autocorrelation sharppeak value, the influence of noise and interference signals on the peak value of the delay autocorrelation function is reduced through spectrum spreading, and compared with a traditional delay autocorrelation synchronization algorithm, the robustness on the interference and the noise can be obviously enhanced. The invention further discloses a synchronizing device and equipment suitable for the broadband wireless communication system and a computer readable storage medium, and the technical effects can also be achieved.

A method is provided for iteratively reconstructing an image of an object. The method includes accessing measurement data associated with the image, and using a simultaneous algorithm to reconstruct the image. Using the simultaneous algorithm to reconstruct the image includes determining a scaling factor that is voxel-dependent, and applying the voxel-dependent scaling factor to a gradient of an objective function to reconstruct the image.

The invention provides a surveying instrument, which comprises a horizontal rotating unit and a measuring unit installed on the horizontal rotating unit, wherein the horizontal rotating unit comprises a driving unit for rotating the measuring unit, a horizontal angle detector for measuring horizontal angle data, a first synchronization data generating unit, a first storage unit and a first control unit, wherein the first synchronization data generating unit outputs first synchronization data which indicate a timing at a time of acquisition of the horizontal angle data of the horizontal angle detector, the first control unit associates the horizontal angle data with the first synchronization data and stores in the first storage unit, wherein the measuring unit comprises a distance measuring unit for performing a distance measurement, a vertical angle detector for detecting a vertical angle at a time of distance measurement, a second synchronization data generating unit, a second storage unit and a second control unit, wherein the measuring unit acquires two-dimensional measurement data based on distance measurement data by the distance measuring unit and vertical angle data by the vertical angle detector, the second synchronization data generating unit outputs second synchronization data which indicate timings of a time of acquisition of the distance measurement data and a time of acquisition of the vertical angle data, the second control unit associates the two-dimensional measurement data with the second synchronization data and stores in the second storage unit, and the horizontal angle data and the two-dimensional measurement data can be converted to three-dimensional data based on the first synchronization data and the second synchronization data.

The invention discloses a method of a 1588 system for achieving synchronization, comprising steps that a main clock acquires a timestamp; the main clock calculates a master-slave time difference according to the acquired timestamp; a control value and / or a phase control value of an adjusted frequency is calculated according to the master-slave time difference and a configured synchronization algorithm; the calculated control value is sent to a slave clock; and the slave clock carries out time synchronization. The invention also provides the 1588 system. According to the technical scheme disclosed by the invention, the synchronization precision of the whole-network clocks based on the 1588 system can be improved.