47results about How to "Avoid frequent updates" patented technology

The invention discloses a route exchange method suitable for a GEO/LEO double layered constellation network. According to the method, a system period is divided into equal-duration time sections based on a dynamic boundary value; a GEO layer satellite high in on-board processing capacity is used for calculating the best route and the second best route for each LEO satellite; in the processes of information transmission and exchange, when loads of the LED satellites are large, the GEO satellite shares part of low priority services in time for the LED satellites, and it is guaranteed that important information is reliably transmitted in real time; when link congestion, node ineffectiveness and other emergency conditions happen in the satellite network, in order to avoid rerouting of the whole network, and the GEO satellite only calculates rerouting for affected routes; after link congestion is eliminated, the LED satellites recover route information in time before congestion in order to avoid link resource waste in the network. In the network that topology time varying happens, links are prone to congestion, on-board resources are limited, continuous high-load flows are prone to being generated, and nodes are prone to being ineffective at the special period, the method can reduce constellation system cost, shorten convergence time, save the on-board resources, increase the utilization rate of the link resources, guarantee that important information is reliably transmitted in real time and improve invulnerability and robustness of the satellite network.

The invention discloses a prediction method of a crack propagation life of an aircraft body. The prediction method comprises the following steps: obtaining a random loading spectrum of an aircraft in flight according to the practical flight situation of the aircraft; dividing the obtained random loading spectrum into a plurality of sections, and respectively performing rain-flow counting and constant amplitude on each section, so that each section is approximated as a block loading spectrum; according to an Miners progressive damage theory, calculating a cycle life lambda effected on a crack of each block loading spectrum under the state of a corresponding stress ratio R, performing a fatigue test under the suitable stress ratio, and obtaining a corresponding stress-life curve; according to an equal defect theory, selecting the correspondence life curve under the suitable stress ratio R in the stress-life curve, and obtaining the equivalent stress Seq corresponding to the same life by a point tracing method; then, according to the R and the Seq, obtaining a maximum stress value sigma max and a minimum stress value sigma min of the equivalent cyclic stress; according to parameters of the equivalent cyclic stress, calculating the propagation rate of the crack when the obtained block loading spectrum is acted on the aircraft body.

The invention discloses a distributed data management system, which consists of application module and data supervisor, wherein the application module installs data access module and data buffer; the data supervisor has subscription control module, subscription listing module, notice module and data accumulator; the application module installs dynamic subscription control module and data logging module; the data supervisor installs data distribution module; the data distribution module connects data supervisor; the dynamic subscription control module connects data record module, data buffer and data access module; the subscription control module connects inform module and data issue module. The invention discloses a dynamic subscription data method.

The invention discloses a multi-time scale cascading failure prediction method of a power system under a typhoon weather condition. The method comprises the steps of 1, acquiring meteorological data and line parameters, and building a dynamic model of typhoon weather; 2, calculating initial fault probabilities of lines to form an initial fault set; 3, switching on or off any line of the initial fault set under an initial load level; 4, enabling the power system to sequentially carry out short-time scale judgment and corresponding control process and line overload control process of the short-time scale judgment; 5, carrying out fuzzy clustering on correlation indexes of the line, and taking the class with the highest relevance in a clustering result as an on-off line in the next stage; 6,updating the load level of the power system and weather indexes of the line; 7, repeating the steps 4-6, and until completion conditions are met, recording and outputting accident chain data. According to the method, an accident chain of the power system under the typhoon weather condition can be more really simulated when typhoon comes, so that guidance can be provided for research on cascading failures in typhoon.

The invention relates to a live broadcast room cover updating method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring current state information of a live broadcasting room; when the current state information reaches a preset condition, acquiring a wonderful fragment corresponding to the live broadcast room; and updating the live broadcast cover of the live broadcast room according to the wonderful fragments. According to the technical scheme disclosed by the invention, the effect of timely drainage can be realized based on the current state information of the live broadcasting room; and the live broadcast room cover can be dynamically updated and can also be prevented from being frequently updated.

The invention discloses a 1-hop and 2-hop clusters coexistent adaptive clustering method based on density estimation in VANETs. The method comprises the following steps: estimating the 1-hop neighbor node density in the future time, as the formula, based on the current position and current speed of a node, comparing the 1-hop neighbor node density with a threshold, and judging whether the node is suitable to form the 1-hop cluster or the 2-hop cluster, and initializing the node as a cluster head node; in each cluster, selecting a node with the minimum relative mobility, that is the formula is the minimum, as a cluster head, reducing other nodes in the cluster to cluster members, and if there are two or multiple nodes with the minimum relative mobility, then selecting a node with the minimum ID as the cluster head; and performing post maintenance of a cluster structure based on the possible situations in the network. A clustering algorithm disclosed by the invention has the advantages of being low in delay and low in packet loss.

The invention discloses a method, device and system for updating the key of a general guide architecture. The method for updating the key of the general guide architecture comprises the following steps of: receiving a Ks_NAF (Network Application Function) acquisition request with a BSF (Bootstrapping Server Function); obtaining a key parameter, and generating a Ks_NAF according to the formula that Ks_NAF=KDF(Ks, a preset character string, RAND: random, IMPI:IP Multimedia Private Identity, NAF_ID and the key parameter); storing and returning the Ks_NAF and the key parameter. When the method for updating the key of the general guide architecture disclosed by the invention is used for updating a GBA (Genetic Bootstrapping Architecture) key, frequent updating of Ks which is not out of date is avoided, and the key updating load of the BSF and a service platform is reduced.

The embodiment of the invention discloses a method for updating a key. The method comprises the following steps: receiving a bootstrapping service identifier from network application function (NAF) and inquiring whether a root key is in the valid period according to the bootstrapping service identifier; if the root key is not in the valid period, returning the error message to user equipment (UE) by NAF and ensuring NAF to initiate generic bootstrapping architecture (GBA) with the UE; and if the root key is in the valid period, generating a random number, obtaining a service key according to the random number, sending the service key, the valid period of the service key and the random number to NAF and ensuring NAF to carry out two-way authentication with the UE according to the service key and the random number. The embodiment of the invention reduces the load of bootstrapping server function (BSF) and the load of a service server. The embodiment of the invention also discloses a device and system applying the method.

According to the risk minimization-based dangerous waste transportation path real-time planning method provided by the embodiment of the invention, risk factors are incorporated into an optimal path planning process, dangerous waste vehicles, road parameters, environmental parameters, traffic information and driving behaviors are comprehensively considered, a transportation risk evaluation function model is constructed, and the risk minimization-based dangerous waste transportation path real-time planning method is provided. And the risk of dangerous waste transportation is subjected to refined evaluation, so that the planned path is more comprehensive and more objective.

The invention discloses a virtual private network access method and a virtual private network access device for a mobile user. The method and the device support the mobile user to access the virtual private network. The method comprises the following steps of: establishing a permanent layer 2 tunneling protocol (L2TP) channel between an L2TP network server (LNS) and a first L2TP access concentrator (LAC), and also establishing the permanent L2TP channel between the LNS and a second LAC in an LAC active initiation way; establishing a public session and synchronizing the second LAC after an L2TP session between a terminal and the first LAC is established; and when the terminal moves from a first LAC network into a second LAC network, rapidly accessing the LNS and establishing the L2TP session without changing an Internet protocol (IP) address of the terminal. The LACs and the LNS are provided with a terminal information table entry and a revocation timer, the LNS is also provided with a message synchronization device for conveniently realizing LAC information synchronization. By the method and the device, the terminal can access the virtual private network by using the same IP address when the terminal moves, so that all service applications based on network IP and network rights are not changed during roaming.

The method comprises: embedding a dependable computing chip into a digital set-top box; the right object of digital media content, decrypt key and decrypt program are packaged into the dependable computing chip; with digital right management technology, each operation in the dependable computing chip can be effectively supervised and controlled to ensure that the digital media content can not be illegally used. In addition, the frequent renew of decrypt key can be avoided, and the renew operation time period can be reduced to 3-6 months.

The invention discloses a binary image coding method through combination of bit operation and probability prediction. The method comprises a coding process and a decoding process. The decoding processis an inverse process of the coding process. The coding process comprises the following steps of predicting a value of a current pixel based on coded pixels in a binary image; carrying out bit operation on a predicted value and a true value of the current pixel to obtain a residual, and obtaining prediction accuracy; and coding the residual into a bit stream through utilization of a entropy coding algorithm, and taking the prediction accuracy as a global context probability model of a binary arithmetic coding algorithm if the binary arithmetic coding algorithm in the entropy coding algorithmis employed. A fixed coding interval is employed, and the complexity of the coding process is greatly reduced.

The invention provides an application updating method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining multiple pieces of historical use time information of using a target application by a target user side in a preset historical time period, and obtaining update package release time information of the target application; predicting predicted use time information of using the target application next time by the target user side based on the plurality of pieces of historical use time information; and determining update time information for updating the target application based on the predicted use time information and the update package release time information of the target application. According to the embodiment of the invention, the use rule of each target application and the update package release time rule are combined, so that not only can unnecessary update be reduced, but also the target user side can be effectively ensured to be in the latest version when using each target application, and better application service can be provided for a user.

The invention discloses a feature rule matching library updating method, a feature rule matching library updating device, a storage medium and electronic equipment. The method comprises the followingsteps: receiving a feature rule processing instruction which comprises a feature rule processing type and feature rule information; determining a target sub-library according to the feature rule processing instruction, and updating the target sub-library based on the feature rule processing type and the feature rule information; determining a target sub-library updated in a preset time interval according to the preset time interval; and compiling the updated target sub-library, and updating a feature rule matching library according to the compiled feature rule matching sub-library. The space for storing the feature rules is divided into the multiple independent sub-libraries, the sub-libraries are small in capacity and high in compiling speed, the sub-libraries are independent of one another and can be compiled in parallel, compiling time is shortened, compiling efficiency of the feature rule matching library is improved, and compiling real-time performance of the feature rule matchinglibrary is improved.

The invention provides an APT heuristic detection method and system based on abnormal component association. The method includes the steps of monitoring all startup processes in the system; recordingcall relations and component environment information of all components and buffering the call relations and the component environment information into a cache knowledge base; recording call relationsand component environment information of components newly acquired by the system; matching the call relations and the component environment information of the newly-acquired components with the cacheknowledge base, and determining whether the components in the system are abnormal based on matching rules; if yes, making an alarm to users and performing risk prompting, or else storing the call relations and the component environment information of the newly-acquired components into the cache knowledge base. The invention further provides a corresponding system and a storage medium. Through themethod, detect modularization, engineering, high concealment and complex APT attacks can be effectively detected.

A method in a terminal for inter RAT access selection is provided. The terminal is capable to operate in one or more RATs. The terminal receives (201) (202), from a network node, one or more dedicated parameters relating to inter RAT access selection, and one or more broadcasted parameters relating to inter RAT access selection. The one or more broadcasted parameters correspond to the respective one or more dedicated parameters. The one or more broadcasted parameters relate to inter RAT access selection. The terminal then acts (203) for inter RAT access selection according to any one out of: one or more updated dedicated parameters, updated based on changes to corresponding one or more broadcast parameters, and any one out of the one or more received dedicated parameters, updated dedicated parameters, or corresponding broadcasted parameters, based on whether one or more conditions are fulfilled or not.

The invention discloses a laser radar simulation method and device. A road model comprises a model boundary and a loading boundary located outside the model boundary. The laser radar simulation methodcomprises the following steps of: when the field of view of a target vehicle collides with the loading boundary, establishing an index of road grid data, wherein the index is a data structure used for managing grids; and after the index is established, updating the road information in the road model. The road model further comprises a vanishing boundary located outside the loading boundary, and when the field of view of the target vehicle leaves the vanishing boundary, a road in the model boundary is deleted. According to the laser radar simulation method and the device, the jamming phenomenon of the laser radar during road updating can be avoided at least; and the situation of frequent road updating can be avoided by increasing the disappearance boundary.