145 results about "Distributed source" patented technology

A computerized method used by a distributed Web search engine for computing a ranking score associated with an item, such as a Web page, comprising the steps of: (1) generating a grouping of items in the Web according to Web sites, geographic criterion, and/or field, (2) determining links among groups; (3) for at least some groups, computing a group ranking using only inter-group links, (4) within at least several of the groups, computing a local item ranking for at least some items within the group, (5) for at least one item, locally computing a global item ranking by multiplying said group ranking and said local item ranking. Advantage: no need to retrieve a global link matrix. Method can be distributed. Reduction of cost in computation, better impeding of spamming, fresher ranking results.

The present invention is a method and apparatus for protection of various items against counterfeiting using physical unclonable features of item microstructure images. The protection is based on the proposed identification and authentication protocols coupled with portable devices. In both cases a special transform is applied to data that provides a unique representation in the secure key-dependent domain of reduced dimensionality that also simultaneously resolves performance-security-complexity and memory storage requirement trade-offs. The enrolled database needed for the identification can be stored in the public domain without any risk to be used by the counterfeiters. Additionally, it can be easily transportable to various portable devices due to its small size. Notably, the proposed transformations are chosen in such a way to guarantee the best possible performance in terms of identification accuracy with respect to the identification in the raw data domain. The authentication protocol is based on the proposed transform jointly with the distributed source coding. Finally, the extensions of the described techniques to the protection of artworks and secure key exchange and extraction are disclosed in the invention.

In accordance with one aspect of the present invention, a network topology management system is provided for managing distribution of network topology information between nodes within a network that performs a distributed source routing protocol. The system includes, nodes distributed throughout a network, that are interconnected by node-to-node links, each of which is described by associated link state information. The system includes a control module that is joined to the nodes and that receives the link state information from each node. The control module records the link state information in master routing tables to form an overall topology map of the network. The control module stores predetermined policy statements that define a manner in which the link state information should be distributed between the nodes. The control module creates abridged routing tables by modifying the link state information based on the predetermined policy statements. The abridged routing tables differ from the master routing tables of the overall network topology map. The control module distributes the abridged routing tables to at least one of the nodes in the network. The control module may entirely mask a select link state such that an abridged routing table entirely excludes connectivity between a select node and a select neighboring node. The control module may modify link state attributes to form different first and second sets of abridged routing tables that are provided to different first and second nodes, respectively.

A method implemented within a distributed build system is described comprising: transmitting a first source file from a program build file repository to a first node, the first node using the source file to generate a target file identified in the build process; receiving a request for the first source file from a second node; and redirecting the second node to retrieve the first source file from the first node rather than from the program build file repository.

Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a non-sequential activation is employed to acquire mathematically complete or sufficient projection data. In another embodiment, a distributed source is provided as a generally semicircular segment. In such an embodiment, an alternating activation scheme may be employed to allow one or more helices of image data to be acquired.

Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a distributed source is provided as arcuate segments offset in the X-Y plane and along the Z-axis.

The invention provides a data backup method of a distributed file system. The method includes: setting up a thread pool by a synchronous control node, distributing source files to each thread according to a copy list, and parallelly conducting metadata synchronization of each source file and the corresponding target file; judging content consistency of each file block in the source files and the target files by each thread of the synchronous control node to analyze difference between each distributed source file and the corresponding target file; judging content consistency of each chunk in the source files and the target files by a source data node to analyze difference between the source file blocks and the target file blocks; duplicating data of the source file blocks to the corresponding target file blocks by a target data node according to the difference analyzing results of the source file blocks and the target file blocks. Data transmission among trans-cluster data nodes can be reduced by effectively using existing data of the target files of a target file system, and data backup execution time is shortened since file backup is completed by taking a file block as a unit.

The invention provides a distributed source center direction-of-arrival estimation method based on Bayesian compressed perception, and belongs to the technical field of wireless mobile communication. The invention mainly aims to solve the problem concerning inherent error of center direction-of-arrival estimation when the center angle of arrival of an information source is not on an angle sampling grid. According to the invention, an antenna array composed of parallel uniform linear arrays is arranged; an approximate array data reception model of a distribution source is established; the space-domain angle is sampled; a parameterized over-complete redundant dictionary is constructed by using an array steering vector so as to make the problem of distributed source center direction-of-arrival estimation converted into the problem of sparse matrix equation solving; a Bayesian compressed perception method is adopted to solve the equation set and obtain the most sparse solution of an unknown sparse vector; and the estimated value of the center direction of arrival is obtained according to the one-to-one correspondence relationship between sparse solutions and space-domain angles. The method of the invention is low in computing complexity, and has the characteristics of high resolution and accuracy under the condition of a small number of snapshots.

Systems and methods are provided for acquiring and reconstructing projection data using a computed tomography (CT) system having stationary distributed X-ray sources and detector arrays. In one embodiment, a non-sequential activation of X-ray source locations on an annular source is employed to acquire projection data. In another embodiment, a distributed source is tilted relative to an axis of the scanner to acquire the projection data. In a further embodiment, a plurality of X-ray source locations on an annular source are activated such that the aggregated signals correspond to two or more sets of spatially interleaved helical scan data.

A method of detecting an interruption of grid electrical power at an output of an inverter power train coupled to an electrical grid includes generating a reference waveform representing a power train output current waveform with a current control loop. An out-of-phase control signal is generated, which is synchronized and out-of-phase with a grid voltage waveform, with a voltage control loop coupled to the output of the inverter power train, the voltage control loop having a gain proportional to an inverter power train load impedance. The reference waveform and the out-of-phase control signal are combined to generate a power train control signal for producing a small phase difference between the inverter power train output current waveform and the grid voltage waveform. The inverter power train output is monitored for a change and the inverter power train is turned off in response to a change in the inverter power train output caused by an increase in inverter power train load impedance resulting from an interruption in the grid electrical power.

The invention provides a virtual machine CPU source monitoring and dynamic distributing method. The method comprises the steps of monitoring the operation condition of various virtual machines in the present period and obtaining monitoring information, wherein the monitoring information comprises the distribution limit value of various VCPU sources of virtual machines and the limit value of source consumption; using the specific value of the sum of the limit value of VCPU source consumption of various virtual machines and the sum of the distribution limit value to calculate CPU source utilization rates of various virtual machines according to the monitoring information, and adjusting the source weight request amount of various virtual machines in the next period according to the CPU source utilization rates; management devices of various virtual machines deciding the source weight distribution amount of various virtual machines in the next period according to the source weight request amount of various virtual machines; distributing source weights to various virtual machine sources according to the source weight request amount of various virtual machines. The virtual machine CPU source monitoring and dynamic distributing method can accurately calculate CPU source amount needed by various machines and VCPUs, distributes CPU source amount according to requirements, and can improve the source utilization rate of the CPU of the virtual machine.

The invention discloses a distributed type source monitoring method and a distributed type source monitoring system based on a content delivery network. The mistaken failure alarming caused by accidental delete operation of a worker is avoided, the load pressure of a source station is reduced, and network failure problems of operators can be differentiated. The technical scheme includes that the method comprises that a distributed node of the content delivery network edge sends a back source request; the distributed node determines whether the source is back to a server, and the request is sent to the source server if the source is back to the server; if the source server is in an abnormal state, the distributed node submits abnormal data to a central monitoring module; and the central monitoring module determines whether the abnormal data meet preset alarming conditions, the alarming is conducted if the abnormal data meet preset alarming conditions, and the alarming is not conducted if the abnormal data fail to meet preset alarming conditions.

A wideband four noise parameter measurement system and method uses electro-mechanical wideband tuners and fast noise and small signal receivers (network analyzers) to collect noise data in fast frequency sweeps over a large number of randomly distributed source tuner states; because of the random nature of source impedances, additional monitoring equipment allow evaluating critical device parameters in view of output mismatch and instabilities in order to validate the measured data. Multiple noise parameter extractions for all possible cross-combinations of source impedance states at each measured frequency allows reliable and physically meaningful generation of wideband noise parameters, even for very low noise and potentially unstable DUT's.

A system and method are provided that employ web service applications to obtain up-to-date information from a plurality of distributed sources in substantially real-time over a network. The system includes web service applications that reside at a plurality of distributed devices. One or more client terminal devices submit data requests, which are broadcast over the network to the plurality of distributed devices. The web service applications receive data requests and authenticate the source of the data request. If authenticated, the web service applications analyze the data request and retrieve information corresponding to the data request from the distributed devices. The retrieved information is forwarded to associated servers and merged into up-to-date reports or other documents.

Characters of the invention are that video sequence codes of each viewpoint are divided into I frame, P frame and SW frame. In each image set, first frame is I frame, and then multiple P frames and SW frames. H.264 standard is adopted to encode and decode I frame, and P frames, and SW frames are as viewpoint switch frames. When encoding SW frames, the invention carries out motion estimation and entropy coding for SW frame and previous frame in sequence so as to obtain bit stream of motion vectors. Carrying out displacement estimation and entropy coding for SW frame and video frame at same position of adjacent viewpoint, the invention obtains bit stream of displacement vectors between viewpoints. After carrying out transforms, quantification, dividing into bit planes, and channel encoding, the invention obtains bit stream of verification information. At decoding end, SW frames are rebuilt by the invention.

The invention provides a data live broadcast system and method which aim to solve the problem that an existing live broadcast system can cause network congestion and even network paralysis easily. The data live broadcast system comprises a live broadcast data source server and cache servers, wherein the live broadcast data source server is used as a root node, the cache servers are used as child nodes, and accordingly a tree topology structure is formed. According to the system, the live broadcast data source server is used for storing live broadcast source data, the live broadcast data source server only distributes source data which require to be subjected to live broadcast to the first level of cache servers, and thus the phenomenon that congestion and paralysis happen to the live broadcast data source server due to the fact that excessive nodes are accessed simultaneously can be avoided. Under the tree topology structure, after the cache servers receive data live broadcast requests, the cache servers can sequentially request data sources towards the previous level of cache servers in a classification mode, and therefore the problem that congestion and paralysis happen due to the fact that excessive nodes are connected into all the levels of cache servers is solved. The source data which require to be subjected to live broadcast can be provided quickly, and the live broadcast quality of the source data is improved.

A system and method are provided for summarizing dynamic data from distributed sources through the use of histograms. In particular, the method comprises receiving a first data signal at a first location, determining a first array sketch of the first data signal, and constructing a first output histogram from the first array sketch and a first robust histogram via a first hybrid histogram. Array sketches of a number of data signals may be calculated, and added to yield a single vector sum. The histogram is constructed from the vector sum. In that way, the vector sum may be analyzed without revealing the individual data signals that form the basis of the sum.

An active millimeter wave imaging system and method. The system includes a spatially distributed broadband millimeter-wave illuminating source for illuminating a field of view and a millimeter-wave imaging receiver for imaging the field of view. The subject area to be imaged is illuminated simultaneously from many different angles by the distributed source. Reflections from the subjected area are then collected and used to form images. These images in preferred embodiments are compared with passive images made without the millimeter wave illumination from the millimeter wave source. The spatially distributed illumination source in preferred embodiments includes a broadband millimeter-wave noise generator producing millimeter wave radiation at frequencies at which the passive receiver is sensitive and a large reflector. In preferred embodiments the reflector has the shape of a section of an ellipse defining two foci.

Systems and methods are provided for acquiring and reconstructing projection data that is mathematically complete or sufficient acquired using a computed tomography (CT) system. In one embodiment, a distributed source is provided as arcuate segments offset in the X-Y plane and along the Z-axis. In another embodiment, a set of projection data representative of a sampled portion of a cylindrical surface is provided. The set of projection data is reconstructed using a suitable cone-beam reconstruction algorithm. In another embodiment, two or more sets of spatially interleaved helical projection data are processed using helical interpolation. The helically interpolated set of projection data is reconstructed using a two-dimensional axial reconstruction algorithm or a three-dimensional reconstruction algorithm.

A task distribution program which converts a source program for a single processor into a program for a multiprocessor device having a plurality of processors causes a computer to construct task distribution unit for, by referencing a definition file, which is stored in memory, and which associates one of the processors of the multiprocessor device with tasks of the source program, converting the source program into a distributed source program in which the plurality of tasks of the source program are distributed among the plurality of processors, and adding, as an argument, to the distributed tasks a processor ID of a task subject to processing by the distributed task. A task distribution device, in which this task distribution program is installed, is also provided.