124results about How to "Save communication bandwidth" patented technology

The invention discloses a weak authentication and key agreement method based on a symmetrical password, comprising the following steps: 1) presetting a long-term shared secret key k between any two network node equipment A and B; 2) respectively arranging a clock on a node A and a node B, wherein, the error between each clock and standard time does not exceed T0 second; 3) internally installing an encryption algorithm E between the node A and the node B; and 4) building an authentication and session key between the node A and the node B by utilizing the encryption algorithm E and the long-term shared secret key k. The method of the invention has low energy-consumption computation and communication, rapid execution speed and high authentication efficiency, and is suitable for resource-restricted communication environments. As the invention uses a symmetric cryptographic algorithm DES or AES, the difficult degree that opponents capture authentication message to obtain the long-term shared key or a ciphertext is relative to the difficult degree of decoding the DES or AES algorithm, thus ensuring the safety of the ciphertext and the key.

The invention discloses a WSN abnormity detection method and system based on artificial immunization and k-means clustering. The method comprises that S1) original monitoring data collected by WSN nodes is obtained to form a time sequence, the time sequence is normalized, compression and dimension reduction are carried out on the normalized sequence, and the mean value and variance of each sequential segments in the compressed sequence are calculated; S2) the Euclidean distance between node data and each cluster head is calculated, and an artificial immunization algorithm is used to search an optimal initial cluster head set for K-means classification; S3) whenever new data is distributed into a corresponding cluster, iterative update is carried out on the cluster head value of the cluster till the amount of all data in the cluster does not change; and S4) the WSN determines abnormity according to the amount of data in the cluster in a K-means clustering result. According to the invention, abnormity information in monitoring data can be discovered accurately, the instantaneity and reliability of abnormity event detection of the WSN are improved, and energy and communication bandwidth of the WSN are greatly reduced.

The invention discloses a coding device and a decoding device of low code rate video super-resolution reconstruction in the video processing field. In the invention, the coding device part provides auxiliary code stream to improve efficiency and precision of the low code rate video super-resolution reconstruction; the decoding device part uses the very little auxiliary code stream provided by the coding terminal to guide the super-resolution reconstruction of the decoding terminal; the coding device part uses the very little super-resolution constructed by pre-decoding closed loop feedback with super-resolution reconstruction to reconstruct the auxiliary code stream, and uses a human eye interested region analyzing module in the coding module to guide and correct with the emphasis on the super-resolution reconstruction of the human eye interested region, to further improve subjective quality input by video decoding. Compared with common video super-resolution ''blind'' reconstruction, the invention reduces complexity of the super-resolution reconstruction obviously, improves the reconstruction efficiency, meanwhile strengths the adaptive capacity of the super-resolution reconstruction to the high dynamic and diversified video image data, and improves the reconstruction precision.

A federated learning global model training method based on differential privacy and quantification comprises the following steps that a central server issues a pre-trained federated learning global model, a local model gradient of each local user is generated, and noise adding, threshold quantification and compression quantification is sequentially performed on the local model gradient of each local user, and the compressed and quantified local model gradient is uploaded to the central server, the central server performs weighted aggregation on the uploaded local model gradient by the central server, updates a global model, issues the global model to each local user, and training is ended when the privacy budget value of each local user is exhausted or the federal learning global model is converged. According to the method, on the premise that the precision of the federal learning global model is not lost, the privacy of local users is protected, the communication overhead in the transmission process is reduced, and the training efficiency of the federal learning global model is improved.

The invention belongs to the technical field of data encryption and privacy protection, and discloses a verifiable ideal on-grid threshold proxy re-encryption method and system, and the method comprises the following steps: generating a first public and private key and a second public and private key through a KeyGen algorithm; encrypting the original message according to the first public key to generate a ciphertext; generating an agent key through a ReKeyGen algorithm according to the first private key and the second public key, dividing the agent key into a plurality of key shares, and signing each key share through a homomorphic signature technology to obtain a plurality of key share signatures; converting the ciphertext into a plurality of ciphertext shares according to the pluralityof key shares, and converting the plurality of key share signatures into a plurality of ciphertext share signatures; verifying the legality of the corresponding ciphertext share according to each ciphertext share signature; combining the legal ciphertext shares into a re-encrypted ciphertext; decrypting the re-encrypted ciphertext according to the second private key to get the original message. According to the invention, the method and system have the advantages of high availability, low trust and strong security, can effectively resist quantum attacks, and is high in encryption efficiency.

The invention provides a software tracing method, which comprises the following steps: arranging tracing information filter condition; collecting the information of each tracing point in the tested software system to obtain the tracing information; filtering the tracing information by the filter condition; sizing and composing the tracing information by the attribute; doing analysis display to the sized and composed information. The invention also provides a software tracing system.

The invention discloses a wireless sensor network abnormal event detection method and system based on secondary mixed compression. The method comprises the steps that S1. primary compression is performed on original data sequences by a compression sensing method; and secondary compression is performed on the compressed sequences by a piecewise linear fitting method so that state edge operators are obtained; S2. edge amplitude and edge intensity of each data point in the compressed sequences are calculated, and new edge point sequences are formed by selecting edge points of low interpolation error from edge point sequences; S3. characteristic value sequences are obtained according to edge point sequences; S4. local accessible density and local abnormal factors are calculated; and S5. event detection is performed in corresponding time sequence intervals according to the size of the local abnormal factors after mixed compression. Search efficiency and abnormal data accurate positioning capacity of wireless sensor network nodes can be enhanced so that abnormal events can be more efficiently and rapidly found; and timeliness of abnormity detection can be enhanced so that energy and communication bandwidth can be greatly saved.

The application relates to the field of intelligent monitoring, and discloses an intelligent security and protection video monitoring method and system, and a monitoring terminal. The flow of monitoring image uploading and the calculation amount of a cloud server can be greatly reduced without lowering the target recognition accuracy. In the present invention, the monitoring terminal performs filtering based on image recognition analysis on the captured image, filters images which do not include a target feature, and uploads an image containing the target feature to a cloud server; and the cloud server performs target recognition on the filtered image uploaded by the monitoring terminal.

A system and method for organizing and distributing electronic healthcare records (EHRs) copies the EHRs from an EHR database to a separate, remote server computer. The remote server generates viewable and printable electronic documents from the EHRs while omitting information that is not needed by the healthcare professional viewing the electronic documents. Electronic documents for patient appointments in a predetermined window are transferred from the remote server to client computers located in a health care facility. The electronic documents may also be transferred between the client computers to save on network bandwidth from the server computer. The server computer routinely updates the electronic documents based on new EHRs received form the EHR database. Stale electronic documents with out-of-date information are tagged as such.

The embodiment of the invention discloses a decoding method which comprises the following steps: acquiring CNG parameters of a first frame of a first superframe from a speech coding frame at the frontof the first frame of the first superframe; carrying out background noise decoding to the first frame of the first superframe according to the CNG parameters, wherein the CNG parameters comprise target excitation gains and LPC filter coefficients, wherein the target excitation gains are determined by fixed codebook gains quantized by the long-term and smooth speech coding frame, and the LPC filter coefficients are defined by LPC filter coefficients quantized by the long-term and smooth speech coding frame. The invention also discloses a decoding device. By utilizing the embodiment, the occupied bandwidth can be remarkably reduced under the condition of ensuring the signal quality.

The embodiment of the invention provides an in-vehicle entertainment product and a corresponding voice transmission method and system, and belongs to the technical field of vehicles. The voice transmission method for the in-vehicle entertainment product comprises the steps: building a data connection between the in-vehicle entertainment product and a mobile terminal when the mobile terminal is located in a vehicle; collecting voice information of a driver; judging whether the frequency and decibel of voice information are respectively within a preset frequency range and a preset decibel rangeor not: filtering the voice information if the frequency and decibel of voice information are not respectively within the preset frequency range and the preset decibel range, or else transmitting thevoice information to the mobile terminal based on the data connection. According to the embodiment of the invention, the method can achieve the filtering of a noise signal collected by the in-vehicleentertainment product, enables the noise signal not to be transmitted to the mobile terminal, thereby saving the communication bandwidth between the in-vehicle entertainment product and the mobile terminal, enabling the in-vehicle entertainment product and the mobile terminal not to carry out the processing of the noise signal, and facilitating the resource allocation of the in-vehicle entertainment product and the mobile terminal.

A method for synchronising a first machine of a manufacturing process section arranged to carry out a production cycle comprising a working part and a non-working part, which said first machine is operated in conjunction with at least one second machine. The first machine carries out a process during the working part of the cycle on a workpiece which is loaded into and/or unloaded out of said first machine by said at least one second machine during the non-working part of each process cycle. The first machine is preferably a mechanical press and the second machine is preferably an industrial robot arranged to carry out a loader and/or unloader function. A system for carrying out the method and a computer program are also described.

The invention provides a data transmitting method and system of an instantaneous communication. The transfer transmitting switches in the date between the client end and the object client end. The method comprises: a) choosing the client end with data transfer ability as node; b) choosing the node for providing the data transfer server to the client end and the object client end and then allocating a node key to the node; c) establishing the node transfer communicating channel; d) using the node transfer communicating channel to switch the data of between the client end and the object client end.

The invention provides a multi-terminal data synchronization method based on ACK synchronization. According to the method, a server and all terminals keep respective latest transmission control character sequence numbers; the server is firstly started to read in the latest value of the own transmission control character sequence number, and then all the terminals are started to read in the latest values of the respective transmission control character sequence numbers; when data is newly added to one terminal, the terminal sends the data to the server; the server saves the data, updates the own transmission control character sequence number, and broadcasts the data to all the terminals; after receiving the data broadcasted by the server, any one terminal parses the transmission control character sequence number of the broadcasted data, and judges whether the transmission control character sequence number of the broadcasted data is equal to the value of the local transmission control character sequence number plus one or not; if yes, the terminal updates the broadcasted data to the local end, and updates the value of the local transmission control character sequence number; if no, the terminal discards the broadcasted data, and uploads a synchronization request containing the value of the local transmission control character sequence number to the server; after obtaining the corresponding data, the terminal updates both the local data and the value of the local transmission control character sequence number.

The invention discloses an efficient and safe multi-keyword-supporting searching method in a mobile cloud. The method is based on a TF-IDF (Term Frequency-Inverse Document Frequency) search model; a data owner stores an encrypted document and an encrypted document index in a cloud end, and a data user inputs a keyword which is encrypted by Fast Accumulated Hashing to search the encrypted document stored in the cloud end, so that search safety is realized. The isolation of search is realized through the addition of noise. The search control is realized through user registration and verification. The high efficiency of search is realized through one-time communication, keyword compression, establishment of search cache and binary set. The efficient and safe multi-keyword-supporting searching method in the mobile cloud guarantees security of document collection, keywords and indexes involved in the search process in the aspect of security, simplifies the search process, increases the search efficiency, compresses total communication amount and reduces communication bandwidth in the aspect of efficiency, and solves the bandwidth bottleneck problem of the encrypted search on a cloud platform.

The invention relates to the voice signal processing field, and especially relates to an adaptive voice activity detection method mixing three thresholds and based on time domain and frequency domain characteristic extractions; the method can control the equipment work states by detecting whether a voice system has active voices or not; when no active voice is detected, the equipment can be in a low power state or a suspended state, thus reducing equipment operation requirements and power consumption, and reducing the communication bandwidth for the voice communication equipment.

The invention discloses a distributed voltage source converter cooperative control method and an AC-DC hybrid microgrid. The distributed voltage source converter cooperative control method comprises the following steps of: adjusting a power flow between an AC sub-grid and a DC sub-grid through a bidirectional interconnection converter; when the load of the AC sub-grid suddenly changes, calculating the total optimal power input of the AC sub-grid, and judging whether the DER total power in the current AC sub-grid reaches the total optimal power input of the AC sub-grid or not; if so, calculating the input power contribution of each DER in the AC sub-grid through using a virtual inertia algorithm; and if not, indicating that the DER in the DC sub-grid has redundant power, the DC sub-grid participates in cooperative control. According to the distributed voltage source converter cooperative control method, the inertia of the micro-grid is remarkably improved, the communication bandwidth is reduced, the service life of storage equipment is prolonged, and the method has the characteristic of quick and stable control.

The invention belongs to the technical field of network communication. The invention discloses a 1588 synchronization method, a 1588 synchronization system and a 1588 synchronization device for a high-speed TTE cascade network. The 1588 synchronization method comprises steps of enabling a port to calculate link delay; enabling a switching node to receive data frames, stamping receiving timestamps,analyzing the synchronous frame Sync and extracting the frame content; caching timestamp information, calculating time deviation, correcting a local clock, forwarding a synchronization frame Sync toa sending port, sending arbitration, sending analysis and caching a frame type, performing MAC sending processing, taking a sending timestamp, extracting the cached sending frame type, modifying a Sync frame correction domain, and finishing transparent transmission. According to the invention, the data frame type is analyzed at the data link layer and then MAC sending processing is carried out, sothat timestamp correction can be carried out rapidly when a synchronization frame is about to be transmitted to a high-speed network port; and meanwhile, the switching node is designed to adopt a transparent clock and common slave clock working mode, so that the universality and functional diversity of a synchronization scheme are improved.