62 results about "Distributed GIS" patented technology

Apparatus, systems, methods, and related computer program products for synchronizing distributed states amongst a plurality of entities and authenticating devices to access information and/or services provided by a remote server. Synchronization techniques include client devices and remote servers storing buckets of information. The client device sends a subscription request to the remote serve identifying a bucket of information and, when that bucket changes, the remote server sends the change to the client device. Authentication techniques include client devices including unique default credentials that, when presented to a remote server, provide limited access to the server. The client device may obtain assigned credentials that, when presented to the remote server, provide less limited access to the server.

The invention discloses a file processing method based on a distributed file system, the system, and a client. The method comprises the following steps: the client sends a file writing request to a meta node; the client receives a file identifier, a data block identifier of each data block, the copy quantity of data blocks and a selectivity factor from the meta node; the client performs hashing operation on the file identifier of the file, the data block identifiers of the data blocks and the selectivity factor to obtain a hashing value; the client finds a consistent hashing ring according to the hashing value, obtains the value of a minimal virtual node greater than the hashing value and clockwise selects virtual nodes consistent with the copies in quantity from the virtual node on the consistent hashing ring; and the client sends the data blocks to different storage devices for storage when the selected virtual nodes meet the pre-condition. According to the invention, the occupation of the storage space of the meta node is reduced, the location speed during data writing can be improved, and the load balance of the system is implemented.

A speaker system comprised of more than one speaker, which utilizes the known characteristics and location of each speaker to enhance low frequency (low (bass) frequency) performance of the system.

The invention discloses a distributed GIS accelerating system and a GIS service processing method. The distributed GIS accelerating system is arranged between a client side and a cloud GIS center and comprises at least one management node server and a plurality of work node servers, wherein the management node server is used for managing and dispatching the work node servers, the work node servers are used for receiving a GIS request sent by the client side, directly returning corresponding tile data to the client side when the tile data corresponding to the service of the GIS request exist in the locality of a service agent accelerating module, and forwarding the GIS request to the cloud GIS center when the tile data corresponding to the service of the GIS request do not exist in the locality of the service agent accelerating module. By means of the distributed GIS accelerating system and the GIS service processing method, the bandwidth pressure of the cloud GIS center can be relieved, and the access performance of a terminal user is promoted.

The invention discloses a data analysis system and method based on a distributed multi-dimensional analysis technical scheme. The system comprises the following modules: a data collection module, a data preprocessing module, a data multi-dimensional model design module, a data multi-dimensional analysis module and a data display module. The system and the method have the advantages that the construction process is clear, and the customization capability of each layer is high. Hundred millions of internet log detailed list data containing user information on the daily TB-level data volume can be processed; after the data is converted into a dimension model and a data cube, data of dimensions such as time, geography, network elements, users, terminals and services can be analyzed; and the dimension and indexes of the dimension model are clear, so that the use by business personnel is facilitated. Compared with a distributed big data processing scheme, the number of manually intervened summary models and the development work of data processing tasks can be greatly reduced.

The invention relates to raster data access, in particular to access of a small piece of spatial raster data and discloses a raster data access method based on a distributed multi-stage cache system. According to the raster data access method, a server data storage system, a server cache system and a client are involved, and the client comprises a client cache and a user interface. The raster data access method comprises the following steps that: the user interface receives a raster data request sent by a user, and whether required data exist in the client cache is judged; the server client cache system judges whether data required by the raster data request exist in the server cache system; and the server data storage system returns the data required by the raster data request; and the client cache is updated, and the returned data are stored in the client cache system. The method has the advantages that the spatial raster data storage and cache performance are improved; the reliability and availability are high; and data are optimized and accessed, so that the data request can be responded efficiently.

The invention provides a true environment test platform for a distributed multi-input multi-output wireless communication system, which includes a client end, a sending end, and a receiving end. The three ends are connected with each other through cabled or wireless local area network; the client end is responsible for forming base band sampling data and sending the data to the sending end through the local area network, receiving sampling data from the receiving end through the local area network, and restoring the original signal through base band treatment; the sending end is responsible for receiving sample data from the client end, informing the receiving end, and sending radio frequency analog signal to wireless channels through antenna; the receiving end is responsible for receiving radio frequency analog signal from the sending end through antenna, and returning the base band sampling data to the client end through the local area network. In signal processing arithmetic study and true wireless channel environment test, the prevention can display the advantage of the tested technology more directly and convectively; signals are able to go through the complete communication process in the true wireless channel environment.

The invention discloses a classified warning method for pipeline safety incidents based on a distributed fiber-optic sensor. The method includes the steps of converting two interfering light signals input by a photoelectric conversion unit into analog voltage signals; acquiring total energy of the analog voltage signals x(n) under a sliding window by wavelet transform, calculating proportion of each scale signal energy in the sliding window, accounting for the total energy, to obtain signal feature values ; and extracting vibration signal feature vectors; determining threat level of the incidents according to the vibration signal feature vectors and a signal strength threshold; and correspondingly screening the pipeline invasion incidents according to the threat level. The method has the advantages that the incidents threatening pipeline safety are handled timely, resource waste is reduced, and property loss is avoided.

The invention discloses a small file access method accelerated based on a solid state disk for a distributed file system. The small file access method comprises the following steps of setting the threshold value of the size of an embedded file; when a client establishes a file, if the size of the established file is less than the threshold value of the size of the embedded file, embedding and storing the established file in a file metadata area, which is located in the solid state disk, of a metadata server as the embedded file, otherwise, storing the established file in an object storage server; when a process of the client opens the file, according to a storage position in file metadata information, responding to the access request of a user and returning an execution result by the metadata server or the object storage server. According to the small file access method, the data of a small file are directly stored in a metadata area of the solid state disk; the computing time of the storage position of the data of the small file is saved; the access communication time delay of the small file is saved; the access performance of the small file is promoted; the small file is conveniently optimized; the load of the metadata server cannot be aggravated; the overall performance of the distributed file system cannot be decreased.

The invention relates to a secure communication method for a distributed multi-granularity controller of a software defined network based on proxy, and belongs to the technical field of inter-domain secure communication of a multi-domain SDN. The method comprises the following steps: designing architecture of a distributed multi-granularity security controller, wherein the architecture comprises a message data packet format between controllers, establishing a communication tunnel via the connection between a controller domain and inter-domain proxies and the connection between the inter-domain proxies, and completing neighbor discovery between the controller, two-step identity authentication and encrypted transmission to achieve direct communication between multi-domain network controllers. In the communication method, the infrastructure is based on the security controller and the inter-domain proxies, a message of a control plane is released to a data plane by the inter-domain proxies for transmission, and thus the communication problem between independent control planes is solved; and meanwhile, the two-step authentication scheme of communication of the controller is given based on a challenge response mechanism and a DTLS protocol, service supply can be defended and refused, and the identity authentication is completed to improve the security.

The invention relates to an auction bidding system based on a distributed non-blocking asynchronous message processing mode and an operation method thereof. The auction bidding system comprises an nginx server, a node server, a Tomcat cluster, a message queue, a bidding logic processing module cluster, and an Oracle database. A user initiates a request through a user terminal, and sends the request to the Tomcat cluster through the nginx server. The Tomcat cluster converts the request into a message, saves the message to the message queue, and gives a feedback to the user for response, wherein the feedback is used to remind the user that the request has been received and is being processed. The bidding logic processing module cluster processes the message in the message queue, and notifies the user of the processing result through the node server.

The invention discloses an open source map-based distributed GIS state monitoring system, and solves the problem that position information of a monitoring point free of surveying and mapping data cannot be determined. According to the key points of the technical scheme, a map display layer comprises a map display module used for displaying a current map region; and a business processing layer is used for inputting address information of each monitoring point, performing coordinate mapping on the address information in an inverse coordinate deduction mode to determine a coordinate position, and performing display in the map display module. According to the open source map-based distributed GIS state monitoring system, the inverse coordinate deduction is that address matching is performed in a geocoding manner, conversion from known address description to corresponding longitude and latitude coordinates is performed, and point coordinates corresponding to the address are queried, so that address-to-coordinate mapping is realized; and the longitude and latitude coordinates of each monitoring point can be obtained without entrusting a surveying and mapping department to perform data surveying and mapping, so that the manpower and material resources are saved and the position information of each monitoring point can be accurately obtained.

The invention provides an efficient caching server based on distributed files. The caching server is used for communicating with a client and comprises an inputting processor, a reader-writer, a caching listener and an outputting processor. The inputting processor is used for receiving reading and writing requests from the client, identification of the client and request types of the client, and transmitting legitimate requests to the reader-writer for processing. The reader-writer is used for verifying the requests of the client transmitted by the inputting processor, outputting read data and processing written data. The caching listener is used for listening business and system events. The outputting processor is used for sending data information read by the reader-writer or return states of the written data to the client. The caching server has the advantages that large file data storage is guaranteed while small data performance can be supported.

The invention relates to a method and system for distributed multi-stage persistence of a huge number of messages. The system comprises a service bus proxy, a service call monitoring subsystem, a log analysis engine and a log storage engine, wherein the service bus proxy is used for storing asynchronous request messages received by a message processing platform in an asynchronous message queue; the service call monitoring subsystem comprises a log receiving engine for receiving log files sent by an asynchronous message sending process; the log analysis engine is used for combining and analyzing the log files; the log storage engine is used for storing statistical information and message information processed by the log analysis engine. By adopting the method and the system with the structure for distributed multi-stage persistence of a huge number of messages, persistent asynchronous storage and persistent distributed storage can be realized by borrowing ideas from asynchronous and distributed file systems, and the performance of the message processing platform is greatly improved through multi-stage persistence, so that the method and the system have wider application ranges.

The invention discloses a cooperative transmission method based on a distributed non-binary LDPC (Low Density Parity Check) code and belongs to the wireless communication field. A source node independently broadcasts data to a destination node and a relay node, the relay node achieves distributed non-binary LDPC encoding to the correctly received data of the source node and then forwards the data, the destination node merges signals from the source node and the relay node to form a code word of the non-binary LDPC code, and soft-input and soft-output iterative decoding is carried out to restore data of the source node. According to the cooperative transmission method provided by the invention, the encoding and transmission of the source node and the relay node are realized in a distributed manner, so that the processing complexity is low; as the non-binary LDPC code is adopted as the encoding scheme, and the diversity gain and the encoding gain are acquired at the same time through iterative decoding, so that noise and fading are effectively prevented.

The present disclosure relates to data distribution amongst nodes in a computing system. For example, a controller device of the computing system may first identify one or more nodes in a network that are available for data processing and/or storage tasks. The controller device may next assign data processing and/or storage tasks to one or more nodes. Data processing and/or storage tasks may be efficiently (e.g., randomly and/or evenly) distributed amongst one or more core processors of the assigned nodes. Techniques described herein help to balance the utilization of computing resources and minimize the risk of lost data during reconfigurations and/or network failures.

The invention discloses a design method for a distributed multi-activity data center based on cloud computing. The design method comprises the following steps: (1) adopting a large two-layer architecture design for a data center network, extending a large-scale two-layer network and VLAN (virtual local area network) to realize large-scale transfer, inside a data center, of a virtual machine; (2) realizing fault isolation of the data center network through a virtual exchanger technology; (3) accessing an exchanger into the data center network through a board card extension technology which can be used for enabling the data center network to sense the virtual machine; (4) designing and constructing a cross data center network which is physically separated, but logically integrated to realize interconnection of the data center, and establishing a distributed virtual data center based on the cross data center network; (5) adopting multi-level safety protection for the data center, wherein the multi-level safety protection includes equipment-level safety protection, network-level safety protection and system-level active safety protection.

In the context of problems associated with self-healing in autonomic computer systems, and particularly, the problem of fast and efficient real-time diagnosis in large-scale distributed systems, a “divide-and-conquer” approach to diagnostic tasks is disclosed. Preferably, parallel (i.e., multi-thread) and distributed (i.e., multi-machine) architectures are used, whereby the diagnostic task is preferably divided into subtasks and distributed to multiple diagnostic engines that collaborate with each other in order to reach a final diagnosis. Each diagnostic engine is preferably responsible for some subset of system components (its “region”) and performs the diagnosis using all available observation about these components. When the regions do not intersect, the diagnostic task is trivially parallelized.

The invention provides a data processing method based on a distributed file system and a server. The method includes the steps that file processing commands for indicating data needing processing are received, attribute caches of the data indicated by the file processing commands are queried, whether attribute caches of data copies corresponding to the data are the same as the queried attribute caches or not is judged, if yes, operation indicated by the file processing commands is executed on the data copies to generate a first operation result, and the first operation result is sent to a first client. Due to the fact that the attribute caches of the data and the data copies corresponding to the data are prestored, the number of the times that the first client has access to the server through a network and then processes data, including files or contents, in a second client through a network between the server and the second client is reduced, and the technical problem that in the distributed file system, data processing performance is greatly affected by network conditions is solved.