311results about How to "Reduce storage space requirements" patented technology

The invention discloses an unmanned path planning method, a system and a device thereof. The method comprises the following steps: acquiring environment perception information and vehicle positioningand navigation information, wherein the environment perception information contains barrier information, curb information and lane line information, and the vehicle positioning and navigation information contains vehicle pose and a target path; conducting subpath generation according to the environment perception information and the vehicle positioning and navigation information to obtain a candidate subpath which satisfies vehicle constraints; conducting collision detection on the candidate subpath which satisfies vehicle constraints, so as to obtain a collisionless candidate subpath; conducting subpath search on the collisionless candidate subpath by A* search algorithm; and obtaining a vehicle local path according to the subpath search result. The requirement on storage space is low, and the requirement on nonholonomic constraints of vehicles can be met. The method of the invention has advantages of good adaptability and good extensibility, and can be widely applied in the field ofautomatic drive.

The invention discloses a OSD controller of images integrated on a video processing chip, which is composed of a bitmap data decompression module, a memory operation control module, a programmable colour mapping module, a OSD image scaling module, an image display management module, a register operation management module and a MCU interface module; through one of serial I2C and parallel work modules provided by the MCU interface module, setting display parameters and operation parameters of the register operation management module, thereby controlling storage, display of OSD data and reading status of the OSD controller; according to setting parameters of the OSD controller, the OSD image display management module controlls the superposition mode of multilayer image OSD data, the mixed mode of OSD images and original video signals, dispaly window size of OSD images and display characteristics, etc.; utilizing off-chip SDRAM as a dispaly memory of image data, utilizing on-chip double port RAM as a control memory of image operation, being convenient to integrate and share resoure with the video processing system.

The invention provides a class synchronization system based on the wireless network. The class synchronization system based on the wireless network comprises a wireless router, an all-in-one computer, a mobile terminal and a server side. The method adopted in the class synchronization system comprises the monitoring step, the judging step and the outputting step. In the monitoring step, the picture information of a brush panel of the mobile terminal is monitored in real time, and a picture synchronization order is sent to the server side to request for the synchronous displaying. In the judging step, whether the picture of the brush panel changes or not is judged, wherein if yes, a screen synchronization processor packages the coordinate pixel points and the corresponding color values of the changing parts in real time and transmits the coordinate pixel points and the corresponding color values of the changing parts to the server side to be processed, and synchronization picture information is generated. In the outputting step, the synchronization picture information is output to the all-in-one computer to be displayed. The screen picture of the mobile terminal can be synchronized to the all-in-one computer to be displayed in real time, the consumption on the CPU, the internal storage and the wireless network flow is reduced, the speed and running efficiency are high, and the synchronization picture is fluent.

The invention belongs to the technical field of block chains. The scheme comprises four kinds of entities including a data user, a block chain, an oracle machine node and a data provider, and the block chain deploys a system management contract, an oracle machine contract, a data storage contract, a data request contract and a user-defined contract; wherein the oracle machine node comprises a request adaptation node, a response adaptation node and a request execution node; according to the scheme, cooperative sharing of the on-chain data and the off-chain data is realized by using the distributed oracle machine, the network bandwidth and the on-chain storage space demand are reduced, and the data integrity can be verified through the on-chain evidence storage; according to the scheme, homomorphic encryption is used for protecting data privacy in the processing process of the oracle machine and realizing basic under-chain computing capacity, better universality and verifiable safety areachieved. Meanwhile, data aggregation operation is set under a chain, and the processing performance is improved compared with on-chain aggregation.

The invention relates to a data storage optimization method for a hash joint. The method includes the steps of selecting a foreign key of a radix hash storage on a fact table, determining a dimension table, setting n bits of radix base numbers, determining 2n hash partition storages, setting 2n radix hash partition queues, storing the fact table and the dimension table by means of a page chain table, carrying out PAX column storage in a page, carrying out radix hash on recorded hash partition attribute values according to low n bits when records are inserted, storing the hash partition attribute values in corresponding pages, dynamically applying a new page after a certain radix hash partition page is filled with the records, directly having access to a specific radix hash partition queue according to a hash value of a connection key, having access to all records of the radix hash partition according to page addresses stored in the queue, having access to the records according to an original physical page link sequence of the tables when full-table scan is carried out, storing a small table R and a large table S in a partition manner, adopting a column type connection method to the fact table during hash joint in a database, and increasing or reducing the bits of the radix hash partitions to achieve dynamic increasing and reducing of the hash partitions.

The invention provides a method for implementing an SM2 white-box digital signature based on a residue number system. The method carries out research in allusion to problems that a key is unsafe in operation in an incredible environment and that a malicious attacker can acquire the key of the system through a means of white-box attacks. Splitting of a big number is realized through using the residue number system, so that the size of a key table is reduced; an intermediate result is ensured to be invisible to the attacker through using scrambling and confounding; and the uncertainty of a terminal key operation relation is ensured through using a random factor of the cloud, the safety of a signature private key in the terminal signature operation process is realized, and verification can be performed by using a standard SM2 signature verification algorithm at the same time. The method provided by the invention is small in required storage space, high in calculation efficiency, good in safety and high in practicability.

The embodiments of the present invention disclose a cache data control method. The cache data control method comprises the following steps: receiving a data access request sent by a source node by a node controller, wherein the data access request carries an access address and an access type; if the access type is a share request, querying whether a first directory entry of the access address exists in a first directory or not by the node controller, and determining that cache data corresponding to the access address are of an exclusive state if the first directory entry of the access address exists in the first directory; determining a target node where the cache data are located according to a storage location in the first directory entry; sending a first interception message to the target node by the node controller, wherein the first interception message is used for indicating the target node to return the cache data to the node controller; and returning the cache data to the source node by the node controller and deleting the first directory entry in the first directory. The embodiments of the present invention also disclose the node controller. By adopting the cache data control method and the node controller, the requirements of directories on storage space can be lowered.

The invention relates to a method and a device for querying OLAP (on-line analytical processing) in real time. The method comprises the following steps of obtaining dimension table information, fact table information and query parameters of a to-be-queried file sent by a client; according to the query parameters and dimensional table information, filtering the corresponding dimensional table, and building a multi-dimensional Bloom filter according to the filtering results; transmitting the multi-dimensional Bloom filter to each node in a broadcasting way, and filtering cube data corresponding to the fact table information; connecting the filtered dimensional table and the filtered cube data, so as to obtain query result; sending the query result to the corresponding query request client. The method has the advantages that the algorithm is quickly found by the multi-dimensional Bloom filter, the storage space is a bit vector, and the smaller storage space requirement is met; the fact table can be filtered in the broadcasting way, the passing number of I / O (input / output) is reduced, and the query efficiency is improved.

A container for creating a microenvironment is disclosed. The container includes a shell, a door and a plurality of supports having a unique design which are used to securely retain items, such as silicon wafers, in a spaced apart parallel relationship. The supports are removable. An electrical path is provided to ground the supports. Kinematic coupling structures are also provided for positioning the container on a surface so as to, for example, properly align the door with the port of a wafer processing tool.

The invention relates to a laptop artificial limb multi-movement-mode identifying method based on support vector data description. All present myoelectric signal classification algorithms have defects. By the support vector data description method, the invention provides a dynamic model with multi-mode characteristic extracting capability and realizes the self-adaptive adjustment of a multi-mode characteristic space. The method first obtains body lower limb myoelectric signal sample data, then establishes a support vector data description multi-type classifier, and then judges the affiliation of a test sample, and finally carries out the support vector data description incremental learning, including sample addition and sample deletion. The method well satisfies the requirement of multi-movement-mode identification during laptop lower artificial limb control, and overcomes the defects that a support vector data description off-line training method cannot effectively treat the sample data reflecting object characteristic change and the like. The method has wide application prospect in the multi-movement-mode identification of intelligent artificial limb control.

The invention discloses a large-sized air-inflating thin film light-shielding cover structure with expanded space. The large-sized air-inflating thin film light-shielding cover structure comprises a light-shielding cover base fixedly connected with a space camera base, and folding cylinders distributed along the light-shielding cover base; the folding cylinders are sleeved with an air-inflating pipe framework; the large-sized air-inflating thin film light-shielding cover structure also comprises adjusting rope-rods which are expanded and pulled on the surface of the air-inflating pipe framework and used for performing unfolding control of the air-inflating pipe framework, and a light-shielding thin film which is glued on the outer side of the air-inflating pipe framework to form rope net reinforcement of the light-shielding cover; and air-inflating tanks which are corresponding to and connected with the air-inflating pipe framework are arranged on the light-shielding cover base, wherein the air-inflating tanks and the folding cylinders on the light-shielding cover base are fixedly connected with the light-shielding cover base in a manner of inward arrangement in sequence based on the peak position of a regular n polygon in the radial direction. By adoption of the large-sized air-inflating thin film light-shielding cover structure, feedback control can be performed by only adjusting the rope length / rope force in the unfolding process, without needing other driving and sensing apparatuses; and in addition, the large-sized air-inflating thin film light-shielding cover structure has the advantages of simple structure, light weight, small size, low storage space requirement, low manufacturing cost and the like, and can satisfy the light weight requirement of a spacecraft.

The invention discloses a Fourier series based measurement method of a phase angle of a partial discharge pulse, which comprises the following steps: adopting a first sensor to detect a high-frequency partial discharge pulse signal, and adopting a second sensor to detect a power frequency signal; adopting a first acquisition system to segmentedly acquire the high-frequency partial discharge pulse signal transmitted by the first sensor, the first acquisition system starting to acquire the high-frequency partial discharge pulse signal transmitted by the first sensor and simultaneously outputting a trigger signal so as to trigger a second acquisition system, so that the second acquisition system synchronously acquire the power frequency signal transmitted by the second sensor; transmitting the acquired high-frequency local discharge pulse signal and power frequency signal to a data analysis system by the first acquisition system and the second acquisition system; and calculating the phase angle of the high-frequency partial discharge pulse signal according to the triggered initial power frequency signal by the data analysis system.

The invention relates to a compression and message matching method for deep message detection deterministic finite automation (DFA) state transfer tables. Before network equipment carries out seven-layer deep detection on the messages, a character library described in regular expression is needed to be converted into the DFA state transfer table, and the table is generally very large and is difficult to store and to realize high-speed message matching. In the method, a bitmap coding mode is used to compress the DFA state transfer table, a compressible part can be stored in a high-speed memory after being compressed, and an incompressible part is stored in a dynamic random access memory (DRAM), so the storage space occupied by the DFA state transfer table is effectively reduced, and the high-speed message matching is easily realized.

The invention discloses a method for autonomous ephemeris prediction of a GPS receiver. The method comprises the following steps: step one, computing a location speed vector of a satellite in ephemeris effective time according to input broadcast ephemeris as an observation value of precise orbital determination; step two, performing precise orbital determination according to the observation value,computing by utilizing an orbital determination program to obtain a precise location speed vector at initial moment of an orbital determination segmental arc, and a satellite area-mass ratio in a solar radiation pressure model parameter; step three, performing orbital forecast, taking the precise location speed at the initial moment of the orbital determination segmental arc as the starting, taking the satellite area-mass ratio as the satellite equivalent area-mass ratio parameter to perform orbit extrapolation, and extrapolating to turn-on moment; and step four, fitting the location speed quantity at the turn-on moment as the broadcast ephemeris to give out the forecast ephemeris, and directly applying the forecast ephemeris to positioning resolution of a receiver location. The first positioning duration of the receiver not in warm start is greatly shortened, a requirement on a chip storage space is reduced, and the cost control of the chip is convenient.

The embodiment of the invention provides an authentication method and system, and the method comprises the steps: enabling a device side to transmit a first authentication request to a server, whereinthe first authentication request comprises a first identification of the device side and a first random number, and the first random number is a character string which is generated by the device siderandomly; receiving a second authentication request sent by the server, wherein the second authentication request is a request sent by the server after the server performs the authentication of the device side based on the first identification and the authentication is passed, and comprises the first random number and a second random number, and the second random number is a character string generated by the server randomly; judging whether the first random number in the second authentication request is the same as a first random number stored locally or not: giving a first authentication reply to the server when the first random number in the second authentication request is the same as the first random number stored locally, so as to notify the server that the authentication is passed.According to the embodiment of the invention, the method reduces the requirements for the storage space of the device side to a certain degree, and reduces the production cost of the device side to acertain degree.

The invention provides a mode for fast synchronization and simple and precise data storage of a block chain system, wherein an account hash is added in a block header data structure of the block chainsystem, which represents a hash summary of a complete account. During the synchronization of block chain system, synchronizing all block headers first, get the ledger hash from the latest block header, then according to the book hash, synchronizing a full account from the network, to reduce the synchronization of block data, on the one hand, the synchronization time and the storage space requirement of the whole node in the block chain system are greatly reduced; on the other hand, the old block data can be deleted at any time during the operation of the node in the block chain system, so asto reduce the storage space requirement in the operation process.

The invention discloses a horizontal parking control method. The horizontal parking control method comprises: defining a coordinate system; dividing a parking phase; planning a parking trajectory; calculating curve parameters of the parking trajectory; determining a parking target position; calculating a parking starting position; planning a geometric path; calculating the rotation angle of a vehicle; calculating and obtaining the curvature of each point on the parking trajectory; and performing conversion to obtain the steering angle of a steering wheel. The invention also discloses a horizontal parking control system by using the horizontal parking control method. The characteristic parameters of the parking trajectory and the steering wheel target steering angle of each point on the trajectory can be directly calculated online in real time, which greatly reduces the requirement of the automatic parking control algorithm for ECU calibration data storage space, and can effectively reduce the system cost. Moreover, the characteristic parameters of parking trajectory and the steering wheel target steering angle of each point on the trajectory adopt real-time online calculation to more effectively correct the parking trajectory in real time, avoid collision occurrence, and obtain better steering continuity.

The invention discloses a transformation method of input data of simulation software of a power system, which can transform an input data file with PSASP (Power System Analysis Software Package) program format into the file with PSS / E (Power System Simulator / Engineering) program format, so as to solve the problems that the PSS / E software simulation research of the power system is difficult to build a model and has large modeling capacity. The method comprises the steps of after transforming data type of bus data, load data, parallel capacitance reactor data, generator data, alternating-current line data, two-winding transformer data and three-winding transformer data with PSASP program formats, writing the data into a load flow calculation input data source file with PSS / E program format according to the bus number order; after transforming data type of the generator and regulator data with PSASP program format, writing the data into a dynamic analysis input data file with PSS / E program forma according to the PSS / E self-defined model format. The method not only enables the PSS / E software simulation modeling of the power system in our country to be possible, but also provides a quick path for preparing PSS / E simulation modeling base data for a major power grid, thus, a great amount of data input working is saved.

The invention discloses a video SoftCast method based on residual distributed compressed sensing, and belongs to the technical fields of video encoding-decoding and wireless transmission. The method comprises the steps of encoding at a transmitting end, channel transmission and decoding at a receiving end. At the transmitting end, a video sequence is read and blocked, and video blocks are observed in order to obtain observed values of frames; in an image group, the observed values of reference frames are subtracted from the observed values of non-reference frames respectively in order to obtain residual observed values; the residual observed values and the observed values of the reference frames are averagely allocated to a plurality of data packets; and meanwhile, energy allocation is performed on the observed value in the packets, so that energy distortions are minimized. During the channel transmission, the data packets are subjected to simple constellation mapping, and input into an orthogonal frequency division multiplexing (OFDM) channel to be transmitted to a decoding end. At the decoding end, users obtain different quantities of observed values according to acceptance capabilities of the users. An initial solution is obtained according to the observed values and an observation matrix; Wiener filtering is performed; multi-direction motion estimation and motion compensation are performed with correlation among videos; an SPL algorithm is used for updating; and repeated iteration is performed till the end of decoding. The different users recover different video qualities by decoding according to actually-accepted data packets.

Disclosed is a low-complex adaptive block compressing sensing image coding method based on visual perception. The low-complex adaptive block compressing sensing image coding method based on visual perception is characterized in that I. Block compressing sensing: 1. Coding: reading images and separating images; block observing; sending observed values and observed rates to decoding end; 2. Decoding: measurement matrix is obtained from the observed rates; finding an initial solution; wiener filtering; updated by procedural language (PL); discrete cosine transform (DCT) switching; bivariate threshold denoising disposing; inverse discrete cosine transform (IDCT); updated by the PL; repeated till finish of initial phrase; II. Visual analysis: analyzing each refactoring DCT coefficient block; classifying blocks; entering feedback channel; III. The adaptive block compressing sensing instructed by visual perception: 1. Coding: adaptive observe according to feedback results;sending observed values and observed rates to decoding end; 2. Decoding: combining the observed values; last phrase recover image as a first value; wiener filtering; updated by PL; DCT switching; bivariate threshold denoising disposing; IDCT; updated by the PL; till end of the decoding; next phrase analysis, adaptive observe and refactoring, till the recover image meets the need.

The invention provides a method for encoding a progressive image based on adaptive block compressed sensing, belonging to the technical field of image ending. The method is characterized by comprising two encoding layers, namely a basic layer and a reinforced layer, wherein the basic layer is used for reading an image and dividing the image into blocks, observing the image blocks, sending observation values and observation rates to a decoding terminal so as to obtain an observation matrix according to the observation rates and obtain an initial solution according to the observation values and the observation matrix, carrying out Wiener filtering, updating with a picewise linear (PL) algorithm, carrying out contourlet wavelet transformation, carrying out bivariate shrinkage threshold processing on a wavelet coefficient, carrying out inverse wavelet transformation, updating with the PL algorithm, and repeatedly iterating until decoding is finished; and the reinforced layer is used for classifying the image blocks, observing the different classes of blocks with different observation rates, sending observation values and observation rates to the decoding terminal, using the restoration image of the basic layer as an initial value of the current decoding, carrying out the Wiener filtering, updating with the PL algorithm, carrying out contourlet wavelet transformation, carrying out bivariate shrinkage threshold processing, carrying out inverse wavelet transformation, updating with the PL algorithm, repeatedly iterating until the decoding is finished, and then carrying out observation and decoding of the next stage until the restoration image meets the requirements.

The invention discloses a soft output parallel stack MIMO (multiple input multiple output) signal detection method, which comprises the following steps: S1, performing QR decomposition on a channel matrix of an MIMO system; S2, performing parallel expansion on nodes in different stacks by adopting a metric-first tree search method under the condition that nodes except leaf nodes on each layer correspond to one stack; working out the log-likelihood ratio of each bit by utilizing a double maximum posterior probability method according to maximum likelihood path metric assumption obtained in the step 2 and candidate likelihood path metric assumption. According to the soft output parallel stack MIMO signal detection method disclosed by the invention, an independent stack is distributed for each layer through tree search, and therefore, the calculated amount of ranking of the nodes in the stacks is reduced, and the storage space requirement is reduced. Meanwhile, the parallel expansion is performed on all the stacks, so that the hardware efficiency is increased, and the complexity of MIMO detection is reduced and the storage requirement is lowered while the signal detection performance is ensured.

This invention discloses an on-line video-on-demand method and a system based on a moving platform. The on-line video-on-demand method comprises: a user client transmits a video-on-demand request to a dispatch server; the dispatch server searches the downloading information of the demanded video which is converted to a mobile video format in a cloud transcoding server through a video conversion list according to the request information of the video, and transmits searched downloading information to the user client; the user client establishes a download task according to the downloading information and downloads the demanded video file which is converted to the mobile video format from the cloud transcoding server through a P2P mean; and the user client plays the downloaded demanded video file. The on-line video-on-demand method and the system have advantages of a C / S model and the P2P model. On one hand, the stress on the server can be reduced through P2P download, and on the other hand, the decoding stress on the mobile terminal is relieved, so that the smooth demanding can be realized.

State mask is adopted in the method to indicate ready state of user's task in a task table arranged in sequence according to priority high and low. Then, dichotomy search is realized by using shift comparison to locate task with highest priority rapidly, based on which, despatcher carries out task scheduling and switching. The method uses first level mask to indicate priority distribution of tasks in ready state. Dichotomy search is utilized to raise efficiency for locating task with highest priority, and to reduce number of time for accessing memory. The invention possesses advantages of stable dispatching time delay, high efficiency and less memory space used. The method implemented in MPC555 hardware platform is as a part of Tsinghua open system of electrical car (Tsinghua OSEK).

The invention discloses an Internet-of-Things-based intelligent doorbell photographing and monitoring system and a control method of the system. An intelligent doorbell in the intelligent doorbell photographing and monitoring system is suitable for doors of home users; when a visitor triggers a switch module of the intelligent doorbell, a built-in camera is used for photographing the visitor and then a photo is transmitted to a remote server of internet by virtue of a home wifi gateway; the remote server is used for sending an instant message to an intelligent client terminal of an intelligent terminal of a house owner; the intelligent client terminal is capable of promoting the house owner by manners of displaying, sending prompt tone or vibrating; the house owner can download the photo from the remote server for checking, so that the requirements of people on the home safety can be effectively solved and met by using a simple and convenient method.

The invention belongs to the technical field of data sharing and particularly provides a method sharing a file according to access permission. The method comprises the steps that a sharer establishes a storage path according to the catalog grade of the file and uploads the file to a server according to the storage path; the sharer selects the file to be shared and a shareree ID, sets the access permission of the shareree ID to the file to be shared, and sends a sharing instruction to the shareree ID; the shareree ID receives the sharing instruction and reads the file to be shared from the server according to the access permission through the sharing instruction. A system for sharing the file according to access permission comprises a storage path establishing unit, a file uploading unit, a sharing permission setting unit, a file sharing unit, a file reading unit and an encryption subunit. Through the method and system, the file can be shared among multiple clients conveniently and quickly.

The embodiment of the invention provides a terminal positioning method and terminal positioning equipment, relates to the field of communication, and aims to reduce resource demand on software and hardware in the terminal positioning process. The terminal positioning method comprises the following steps: segmenting a local sequence corresponding to a subframe of a positioning reference signal (PRS) by a terminal to obtain a segmented local sequence, wherein a starting orthogonal frequency division multiplexing (OFDM) symbol and a finishing OFDM symbol of each segment of the segmented local sequence contain the PRS and the segments of the segmented local sequence are separated by OFDMs which do not contain the PRS; respectively obtaining sub-correlation values of the segmented local sequence and a corresponding received signal in a search window; superposing the sub-correlation values to obtain a correlation value of the local sequence and the corresponding received signal; according to the correlation value, obtaining a reference signal time difference (RSTD), and sending the RSTD to network side equipment so as to position the terminal by the network side equipment according to the RSTD. The terminal positioning method and the terminal positioning equipment are used for positioning the terminal.

The invention provides a white-box software realization method based on remainder system for a commercial cipher SM2 encryption algorithm and provides a white-box software realization scheme based on technology of a lookup table and the scrambling mixing. The white-box software is realized through cooperative computing of a cloud server end and a client, so safety of a terminal private key during storage and operation can be effectively protected, and the white-box software realization method can be used by combining the standard SM2 encryption algorithm. In addition, by use of the remainder system theory to resolve the big integer operation, the size of the lookup table is reduced and storage space required for the operation is reduced.