5687results about How to "Improve fault tolerance" patented technology

An uninterruptible power supply (UPS) system and control method thereof is provided. The system contains a plurality of UPS modules connected in parallel, and each module is equipped with full uninterruptible power supply capabilities, and redundant control logic and functional capabilities for self-initiated role detection, master arbitration and parallel processing. The UPS system is self-initialized through a master arbitration process to elect a virtual master among the peers for maintaining inter-unit signaling between parallel UPS modules and controlling the parallel operation. If the virtual master is failed, other UPS modules will initiate the role detection and master arbitration to re-elect a new virtual master. Parallel operation is accomplished without any external controller; the system can be operated with only one UPS module; distribution of adequate resource to each module is properly arranged, thus the risks of system-level single-point failure are much reduced.

The invention discloses a design method for a distributed hydrological model by using a grid as an analog unit, which is called as ESSI for short. The design method comprises the following steps of: obtainment of a distributed parameter: converting vector data into grid data; generalization of a watershed hydrological process: establishing a universal runoff generating type for the grid; design of a runoff generating process: respectively computing the water-quantity distributing condition of each part according to different prior-period soil water conditions; design of a flow collecting process: respectively designing a Muskingum-Cunge method, a delay algorithm and a riverway segmentation Muskingum method for the flow collecting process computation of the model under different conditions; and model development and integration. The invention not only can finish the watershed hydrological process simulation at an arid region and a humid region, but also can realize the short-term flood forecast and the long-term rainfall-runoff process simulation and prediction of a watershed by using modularization and integration ideas as means, thereby providing scientific reference bases for deeply learning about the physical mechanism of water circulation by people, reducing the drought and water-logging disasters and reasonably developing and utilizing water resources.

A permanent magnetically excited electrical rotary drive for a blood pump is proposed, comprising a permanent magnetic rotor and a stator, said stator comprising a drive winding having at least two loops for the production of a magnetic drive field which produces a torque on the rotor, with each loop belonging to a different electrical phase, furthermore comprising a setting device which supplies each loop in each case with a phase current or in each case with a phase voltage as a setting parameter, with the setting device comprising a separate power amplifier for each loop so that the setting parameter for each loop can be regulated independently of the setting parameter for the other loops.

A combined navigation method for space vehicles based on multiple information integration belongs to automatic navigation methods of space vehicles. The navigation method includes the following steps of building a satellite motion state equation based on dynamics of orbits; building a satellite automatic navigation system based on X ray detector; building a satellite automatic navigation sub-system based on infrared horizon sensor and star sensor; building a satellite automatic navigation sub-system based on radar altimeter; building a satellite automatic navigation sub-system based on ultraviolet triaxial sensor; carrying through information integration processing on the output of the four sub-systems; outputting navigation information; adopting the detecting method of x<2> to detect the system that has a fault and insulating the faulty sub-system. The combined navigation method can realize automatic navigation with high precision of deep space detectors and has the advantages of high reliability and fault-tolerance capacity.

A communications system with distributed intelligence thereby allowing easy expansion of the system while also providing a high degree of fault tolerance. The communications system allows for conversion, transmission and restoration of the human voice over a digital network. A telephone can be used as the input device for receiving the analog signal, or human voice. The telephone is also used to select a destination for the analog signal. The information is transmitted over the digital network and may also traverse through a private branch exchange and a wireless network before it arrives at its destination. At the destination the transmitted information is restored to an analog signal and played over one or more speakers. The present system is especially suited for use with an existing network.

A surveillance system having a plurality of MPEG compressed data streams each originating from a separate video/audio source. The data is streamed onto a plurality of media of different type in real time. The plurality of media are selected from the group consisting of: a digital tape, a hard disk, a semiconductor memory, a CVD, a DVD, and an optical disk. The system generates directory information which is also stored on a plurality of different media.

A distributed software architecture implements a routing protocol as a set of processes running on a set of processors of a router. The distributed processes cooperate in a manner that internally exploits the distributed set of processors, yet externally presents an appearance/behavior of a single routing protocol process communicating with its peers in the network. The distributed nature of the architecture is achieved without altering the fundamental routing protocol, but by apportioning certain functions/tasks of the protocol among various processes in the multiprocessor router.

Systems and methods for conducting a multi-endpoint video signal conference are provided. Conferencing endpoints are linked by pairs of a reliable and a less reliable communication channel. Conference video signals are scaleable coded in base layer and enhancement layers format. Video signal base layers, which correspond to a minimum picture quality, are communicated over reliable channels. The video signal enhancements layers may be communicated over the less reliable channels. A conference server mediates the switching of video layer information from transmitting endpoints to receiving endpoints without any intermediate coding or re-coding operations. The video conference can be integrated with an audio conference using either scalable coded audio signals or non-scaleable coded audio signals.

The invention relates to the technical field of search engines, specifically relating to a distributed real-time search engine. A system construction and operation method of the search engine at least comprises the following steps: A, designing a functional structure of a system; B, designing a data index structure of the system; C, creating an index; D, updating the index; and E, searching the index. The distributed real-time search engine can construct an updating index and a combining index simultaneously in the memory of the system, and can access the updating index and the combining index simultaneously while searching the index; when the number of the documents of the updating index is accumulated to a threshold value, the updating index is submitted to a disk index and changed as a combining index, and the original combining index is changed as a new updating index; and therefore, the updating data can be searched, and the real time property of the retrieval data of the search engine can be improved.

The invention discloses a dual-computer redundancy fault-tolerant system and the redundancy switching method. The system comprises an A computer, a B computer, redundancy switch control units in the A and B computers transmit respective switch signals to a redundancy switch selecting unit, and the final control signal generated by the redundancy switch selecting unit is transmitted to a controlled unit. The redundancy switch control unit includes an arbitrary switch unit, a heartbeat receiving unit, a power on-off unit and a monitoring unit. The method comprises the following steps: the two computers are powered up, a master computer and a slavery computer are decided by power up strategy; the states of the two computers are judged; if the two computers have no fault, the task segment of a system is judged: if the system is in normal task segment, a working computer powers up a backup computer, and executes cold backup strategy; if the system is in key task segment, the working computer powers down the backup computer, and executes hot backup strategy; if a single computer has fault which is restorable, the fault is restored, or else, the system enters into single computer state. The system has simple structure and reliable signal transmission; the method is easy to control, the system fault rate is greatly reduced, thus having good fault-tolerant effect.

The invention relates to SINS/GPS magnetic compass integrated navigation system data fusion method. It includes the following steps: processing position speed error combination for the SINS and GPS; estimating carrier position, speed, and altitude error by the first Kalman filtering to feed back and rectify SINS; calculating direction cosine matrix from carrier coordinate system to level coordinate system by outputted roll angle and pitch angle to assist magnetic compass to gain carrier magnetic course angle, and course angle; processing course angle error combination for the SINS and magnetic compass; estimating carrier altitude error by the second Kalman filtering to feed back and rectify SINS; outputting carrier position, speed, and altitude information from SINS to user. The invention has the advantages of simple computing, high precision, strong fault tolerant ability and wide application. Thus it can be used to increase magnetic compass altitude fixing precision, navigation precision of the SINS/GPS magnetic compass integrated navigation system used in space craft, aircraft, shipping, or surface car.

Systems and methods for conducting a multi-endpoint video signal conference are provided. Conferencing endpoints are linked by pairs of a reliable and a less reliable communication channel. Conference video signals are scaleable coded in base layer and enhancement layers format. Video signal base layers, which correspond to a minimum picture quality, are communicated over reliable channels. The video signal enhancements layers may be communicated over the less reliable channels. A conference server mediates the switching of video layer information from transmitting endpoints to receiving endpoints without any intermediate coding or re-coding operations. The video conference can be integrated with an audio conference using either scalable coded audio signals or non-scaleable coded audio signals.

The invention discloses a method for publishing and broadcasting streaming media on the Internet in a live mode. The method is realized based on a system for publishing and broadcasting streaming media on the Internet in a live mode, and the system comprises a publishing client side, a server side and a playing client side, wherein the publishing client side is interactive with the server side through an HTTP method and uploads streaming media blocks to the server side, the server side merges and stores the streaming media blocks into streaming media subsections according to set streaming media subsection time and creates an index corresponding to the sequence of a plurality of streaming media subsections, and the playing client side is interactive with the server side and downloads the streaming media subsections from the server side for playing according to the index sequence. The method for publishing and broadcasting the streaming media on the Internet in the live mode is based on the HTTP protocol system, can be in simple application integration with a collecting side in a low coupling and non-intrusive mode, is easy to realize on various terminal platforms, is short in time delay of live broadcast, is good in robustness and fault tolerance, and supports large-scale deployment on the Internet and a CDN deployment mode.

The invention belongs to the technical field of privacy protection in cloud computing and discloses a privacy protection method in face authentication system based on edge calculation. The method comprises the steps that: a camera collects a face image and uploads the face image to a connected edge computing node, an authority assigning mechanism sends a permission vector Li of a user to the edgecomputing node after collecting user face information, an edge computing device carries out feature extraction on a face image of a user requesting registration to obtain a feature vector by using a method based on a deep convolutional neural network, a safe nearest neighbor algorithm is performed to encrypt the feature vector of a registered user, and a secret sharing homomorphic algorithm is performed and n sub-secrets are generated according to the feature vector and are distributively stored in n edge computing devices. The direct upload of sensitive data to a cloud server is avoided, theprivacy of the face data is protected, and the fault tolerance of a system is improved. Results prove that the accuracy of face recognition under a ciphertext of the present invention is completely equal to the accuracy of face recognition under a plaintext.

The present invention provides a ground three-dimensional laser scanning point cloud and image fusion and registration method, and the limitation of the scanning of the ground three-dimensional laser scanning technology is overcome. The point cloud data obtained by ground three-dimensional laser scanning often comprises various areas which can not be measured, point cloud holes are generated, and thus local area information of a scanned object is lost. The holes cause that a model can not realize visualization correctly, and model subsequent processing is influenced too. For the above problems, the invention aims to solve the problems through the following technical scheme that an SIFT image is used to carry out mosaic processing of collected image photos by means of an algorithm to obtain a panoramic image, the intensive reconstruction is carried out through the panoramic image to obtain the 3D point cloud data generated by the image photo, and an iterative closest point algorithm (ICP) is used to realize the registration working of laser scanning point cloud and image data generation point cloud.

The invention discloses a gatherer of deep soil of the moon. An upper end surface of a housing of the gatherer is provided with a drilling machine and mechanical arm connecting device. A first separator plate, a second separator plate and a third separator plate are installed in the housing from top to bottom. A screw driving motor is installed on the first separator plate and drives a screw by a gear. A slide block in cooperation with the screw is fixed on a slider. Four guide rods pass through four through holes located at an end of the slider. A drill pipe driving motor is installed in the middle of the four guide rods. The drill pipe driving motor drives a drill pipe connector by a gear. Electromagnet driven wedges are arranged in the drill pipe connector. The electromagnet driven wedges stretch out from pin grooves of inner conical surfaces of corresponding drill pipes. A drill pipe rotating disk is installed in the center of the second separator plate. The drill pipe rotating disk is in cooperation with a drill pipe rotating disk driving motor by a gear. The third separator plate is arranged under a clamping device. Multiple drills are installed on a drill rotating disk along a circumferencial direction. On the third separator plate, a drill rotating disk driving motor is in cooperation with the drill rotating disk by a gear. A lunar soil bag is enclosed in the drill pipes having hollow structures. The gatherer of deep soil of the moon has the characteristics of compact structure, small floor space, high reliability of a transmission mode, large drilling and production depth, large sampling amount and simple and reliable sample recovery.

A distributed computing system can be operated in a fault tolerant manner using a set of computing devices. A set of computing devices can tolerate a number of failures by implementing identical replicas of a state machine and selecting proposals. The set of computing devices participating in the distributed computing system by hosting replicas can be modified by adding or removing a computing device from the set, or by specifying particular computing devices for participation. Changing the participating computing devices in the set increases fault tolerance by replacing defective devices with operational devices, or by increasing the amount of redundancy in the system.