67results about How to "Reduce transfer data" patented technology

A system and method for efficiently correcting block errors in packet-based digital communications are provided whereby the ratio of redundant symbols/message symbols over the length of a data packet decreases in order to more efficiently use available bandwidth. The reduction of this ratio, and subsequently the change in a corresponding framing schedule, may be determined through negotiations between the transmitting device and the receiving devices. Each receiving device calculates a redundancy requirement based on signal-to-noise ratio samples. This requirement is returned to the transmitting device in the form of a schedule request. The transmitting device determines if a new framing schedule is needed based on the schedule request, and communicates this new framing schedule to the receiving device. Once the receiving device acknowledges receipt of the new schedule, the transmitting device switches to the new framing schedule for future data packet transmissions.

A receiving processing unit receives identical SD pictures transmitted a plurality of number of times, and performs addition for weighting an SD picture stored in a storage and the received SD pictures. The receiving processing unit stores the obtained values as a new SD picture in the storage. A picture-quality determining unit determines the picture quality of the new SD picture stored in the storage, and based on the determined picture quality, a request-signal transmitting unit requests class codes representing classes obtained by classifying the pixels of an HD picture in which the quality of an SD picture is increased. A receiving-control unit receives class codes which are transmitted in response to the request, and based on the SD picture and the class codes, an adaptive processing unit calculates predicted values of an HD picture corresponding to the SD picture.

The invention provides a method for obtaining contact person data in instant messenger tool. An instant messaging client saves the data and a version number of a contact person into a local database, and synchronizes with an instant messaging server through the version number; the instant messaging client obtains the version number of the contact person from the instant messaging server when the user logs on; if the version number is consistent, the local data is used, otherwise the contact person is obtained from the instant messaging server. The client does not need to download the data of contact persons in most cases, which greatly reduces the data needed during the logging on, thereby improving the speed of the logging on, saving network resources and decreasing the pressure to the server.

The invention discloses an intelligent aerial photographing system. The intelligent aerial photographing system is characterized by comprising an aerial photographing image collecting device and an aerial photographing image processing device; the aerial photographing image collecting device comprises an aerial photographing aircraft and a camera device; the aerial photographing processing device comprises a primary processing device on the aircraft and an advanced processing device on the ground; an unmanned aerial vehicle is adopted as the aerial photographing aircraft and comprises an air flying subsystem and a ground control subsystem; the camera device comprises a high-definition camera installed on the lower portion of an unmanned aerial vehicle body. The invention further discloses a method for carrying out primary processing on images with the primary processing device and a method for carrying out advanced processing on images with the advanced processing device. The aerial photographing system comprises the unmanned aerial vehicle which is capable of achieving automatic flying continuation and automatic control; meanwhile, high-definition images are automatically collected and processed multiple times, and complete and clear images can be obtained.

The invention relates to a method for realizing positioning based on a Beidou short message transmission differential signal. The method is provided in order to improve the applicability of satellite differential positioning, and is used to perform differential positioning in an area with neither network base station nor mobile communication base station. The method comprises the following steps: a reference station terminal gets a differential correction number according to a received satellite signal and the coordinate of a reference station, and stores the differential correction number in an internal memory of the reference station terminal; a moving station terminal generates a differential data request including differential start time and differential frequency, and sends the differential data request to the reference station terminal; the reference station terminal sends corresponding differential data to a reference station coding module after receiving the differential data request sent by the moving station terminal; the reference station terminal sends a single piece of differential data information through a Beidou short message, and multiple cards send differential data information in turn to meet the requirement of the moving station terminal for positioning frequency; and the moving station terminal receives differential data of multiple epochs, uses the data to fit a pseudo-range differential correction number through Chebyshev polynomial interpolation, and uses a correction number obtained by extrapolation to perform differential positioning.

The invention discloses a nonlinear truck trailer system fuzzy control method based on an event trigger mechanism. The method comprises the steps that a dynamic mathematical model of a truck trailer system is established; 2 an event trigger condition of the truck trailer system is set based on the event trigger mechanism, and a fuzzy controller of the truck trailer system is constructed; and 3 a fuzzy control law u (t) transmits a control signal command to an actuator of the system through an event triggering device to realize control. According to the nonlinear truck trailer system fuzzy control method based on the event trigger mechanism, a relatively ideal dynamic characteristic is acquired; the method is robust to the change of the parameters of the system and external disturbance signals, so that the system is stable; in addition, due to the introduction of an event-triggered communication mechanism, the time-varying delay characteristic of the truck trailer system is effectivelysuppressed, and transmission data in a network are reduced; and the burden of the bandwidth occupancy rate of the network is reduced.

The invention belongs to the technical field of English distance education, and discloses an English distance education and test system and method. The system comprises an image collection module, a voice collection module, a data collection module, a data processing module, an account management module, a wireless communication module, a display module, a radio base station, a remote server, andan intelligent mobile terminal. The image collection module and the voice collection module are connected with the data collection module through circuit lines, the data collection module is connectedwith the data processing module through the circuit line, and the data processing module is connected with the account management module and the display module through circuit lines. Sentence pronunciation speed, accent, content, rhythm and intonation indicators are fully considered due to a Chinese-English translation module and an English pronunciation detection module, and the system has highdetection accuracy and high reliability, and makes distance network English learning data much more safer due to the account management module.

The invention relates to a fire boundary vector information real-time extraction and visualization method and system. With the advantage that an unmanned aerial vehicle is not affected by harsh conditions in the wild being made full utilization of, the unmanned aerial vehicle is equipped with a GPS module, a trajectory control module and a data preprocessing module and the like, and operating personnel can control the unmanned aerial vehicle to fly right over the boundary of a fire scene and record the flight path at regular time under the guidance of ground platform real-time videos, wherein the recorded flight path of the unmanned aerial vehicle can represent the boundary of the fire scene; after re-sampling pretreatment of the trajectory, the forest fire boundary data can be transmitted to a remote server through a communication module; a server program analyzes a message and writes the whole boundary of the fire scene into a database; for large-range forest fire, the invention also considers a multi-UAV collaborative boundary obtaining method; and finally, decision-aid visualized software can read data from the database and updates the data regularly, and decision personnel can know fire scene situations in a two-dimensional or three-dimensional virtual forest environment in real time.

Provided are a method and a system of video transmission. The method includes the steps that frame pictures of a transmission video are acquired according to an original video; circumscribed polygons of displacement of moving objects and position information of the moving objects in the frame pictures are calculated; according to the position information, background pictures of the circumscribed polygons are collected, and moving objects videos of all frame pictures inside the circumscribed polygons are collected; and the video transmission is conducted according to the position information, the background pictures and the moving object videos. According to the method and the system of the video transmission, video data of the minimum region of the displacement of the moving objects of the transmission video are transmitted, images, except for the minimum region, only need to be transmitted for one time, transmission of the redundant data size of the background part is reduced, transmission data are effectively reduced, and speed and efficiency of the video transmission are improved.

The invention discloses a railway shunting top-delivery operation smart control system. The railway shunting top-delivery operation smart control system comprises information perception and processingequipment, vehicle-loaded monitoring equipment, a ground server, a point-to-point high-speed wireless transmission system and an Internet communication system, wherein the information perception andprocessing equipment is mounted on an end wall of a vehicle at the forefront pushed by a shunting top-delivery operation train set, and is used for acquiring front-end operation information of top-delivery operation, and transmitting the acquired information back to the vehicle-loaded monitoring equipment in a cab through the high-speed point-to-point wireless data transmission system; a driver controls the shunting top-delivery operation according to the transmitted front-end operation information, and transmits the front-end operation information and driver operation information to the ground server through the Internet communication system; ground control personnel performs real-time monitoring on the shunting top-delivery operation to realize railway shunting top-delivery operation smart control. By adopting the railway shunting top-delivery operation smart control system, the problem of poor front lookout of a shunting driver in the top-delivery operation is solved, and the safetylevel and operation efficiency of the shunting top-delivery operation can be improved effectively.

The invention relates to a virtual reality device and control device and method thereof. The control method includes performing pairing with the virtual reality device; identifying user operation and generating operation data; processing operation data and generating command data and calling a Bluetooth module to send instruction data to the virtual reality device. According to the invention, the virtual reality device is controlled through rich control functions of a prior smart mobile terminal. Problems of single function, incompatibility and carrying inconvenience of a prior Bluetooth handle are solved. Cost of the virtual reality device is reduced and interaction experience is improved.

The invention discloses an information forwarding method based on an International Electrotechnical Commission (IEC) 61850data set. The method comprises steps of (1) constructing a scheduling data set forwarding information module for every scheduling system; (2) loading the scheduling data set forwarding information modules by using a scheduling system; (3) loading the scheduling data set forwarding information modules of the scheduling system which is communicated with a substation by using the substation, and constructing the configuration of the scheduling data set forwarding information module to a forwarding information data module subset; (4) enabling the substation to use the sane data set to generate a report example, sending a non-buffering report directing and executing the step (5) by using a buffering report, and (5), acquiring the corresponding relation between the scheduling system and the report example, modifying the data set associated with the report example and deleting data which cannot meet a rule of a buffering region. The report information can be filtered for different clients, the report service of different forwarding information modules is provided, and the problem of forwarding information filter of the substation and the scheduling of the IEC 61850 communication is solved.

The invention provides a substation intelligent inspection system. The system comprises smart glasses, a miniature microphone, a mobile terminal, a cloud server, an electronic lock and a controller. The controller is installed in a control room of a substation and is connected with the cloud server through a communication network or a power private network, the mobile terminal is connected with the cloud server through the mobile communication network, the electronic lock is installed on the door of the substation, the electronic lock is connected with the controller, and the smart glasses andthe miniature microphone are in wireless connection with the mobile terminal, the smart glasses are configured to shoot images and videos of devices to be inspected in the substation and send the captured images or videos to the mobile terminal, and the miniature microphone is configured to collect the field sound and send the collected audio to the mobile terminal. The substation intelligent inspection system can monitor the working condition of the substation in the whole process so as to improve the efficiency and the accuracy of the substation inspection.

The invention relates to a quantum communication service station digital signcryption method and system based on an asymmetric key pool. A quantum communication service station is provided with a service station key card; each participant is provided with a client key card; the method comprises the following steps: at a signcryption party, extracting a parameter Kia1 from an asymmetric public keypool of a client by utilizing a random number, extracting a parameter Kia1 from an asymmetric private key pool of the client, extracting a parameter Kia2 from an asymmetric key pool of a service station, and performing calculating by utilizing the parameter Kia2 to obtain a first intermediate parameter and a second intermediate parameter; encrypting the first original text by using the first intermediate parameter to obtain a first ciphertext; using a Hash function to act on the first original text and the second intermediate parameter to obtain a parameter ra; performing calculating by usingthe parameter ra and the parameter kia1 to obtain a parameter sa; calculating the parameter Kia2 and the parameter Kia1, using a Hash function to act on the calculation result and the parameter ra toobtain a parameter rka, and using the parameter rka to encrypt the parameter sa to obtain a parameter srka; and sending the first ciphertext, the parameter ra and the parameter srka as signatures to apassword verification party for signature verification.

A knit goods simulation device converts design data of knit goods to myoneme data that express loops by myonemes. The knit goods simulation device expresses the loop by polygonal columns, divides side surfaces of the polygonal column into polygons, and stores the polygon apical coordinates in a polygon memory. The knit goods simulation device extracts loops in a simulation image displayed on a monitor, processes them at a graphic CPU, and limits the processing scope. Further, the knit goods simulation device stores a part of the apical data in a graphic memory so as to make its transfer from the polygon memory unnecessary. The knit goods simulation device can process a three-dimensional image at high speed.

The invention relates to a file management consistency maintenance method in a real-time cloud file-system. A load balancing algorithm is employed for processing mass data efficiently in a cloud environment. When the number of cooperative people is very low, data can be rapidly processed by a server, and the data is directly processed through the server. When the number of cooperative people is high and reaches a set critical value, data is distributed. A plurality of servers work at the same. The servers process the data rapidly and feed back partial processing results to the server for finalprocessing. A COT algorithm is improved to adapt to new centralized architecture in the cloud environment. Unnecessary data transmission is reduced. A relatively high timeliness demand is achieved byreducing query and conversion time. A file model under cloud storage is improved into a cooperative cloud file management system. For three operations: create, delete and rename of a file node in thefile model, the improved COT algorithm is applied to the file management in the cooperative file-system.

The invention relates to a distributed network asset surveying and mapping method and device, computer equipment and a storage medium, and the method comprises the steps that a distributed network asset surveying and mapping node responds to the received network asset surveying and mapping request information, and obtains the current data transmission quantity of seed equipment corresponding to the surveying and mapping node in real time, whether the seed equipment is in an idle state or not is judged according to the data transmission quantity; when it is judged that the seed equipment is inthe idle state, a scanning instruction is sent to electronic equipment directly connected with the seed equipment so as to scan the electronic equipment to obtain a scanning result of the electronic equipment; and the distributed network asset surveying and mapping node compares the current scanning result of the electronic equipment with a previous scanning result, generates a local surveying andmapping result according to a comparison result, and sends the local surveying and mapping result to a network asset surveying and mapping server.

The invention provides a transmission channel number conversion system and a conversion transfer method of a low-voltage differential signal. The system comprises a control module, an image source device, a channel number conversion transfer module and a channel number receiving conversion module. The method comprises that: synchronizing an output channel number of an image source device with a receiving channel number of a channel number conversion transfer module to carry out data transmission; carrying out data transmission under different conditions according to the number mutual relation between the receiving channel number and the output channel number of the channel number conversion transfer module (the number of the two channels is not equal); synchronizing the output channel number of the channel number conversion transfer module and a receiving channel number of a channel number receiving conversion module to carry out data transmission, and carrying out data transmission under different conditions according to the number mutual relation between the receiving channel number and an output channel number of the channel number receiving conversion module (the number of the two channels is not equal).