30results about How to "Does not affect availability" patented technology

The invention discloses a privacy protection query language PQL and a system thereof; the system comprises a PQL statement and a system, and the system comprises an analysis module, a query module anda noise adding module; the analysis module comprises a lexical analyzer and a syntactic analyzer; a user inputs a PQL statement according to a preset semantic grammar rule, and after receiving the PQL statement, an analysis module performs error check on the PQL statement through a lexical analyzer and sends a correct result to a grammar analyzer; performing grammar and semantic check on the PQLstatement by a grammar analyzer, and generating a mapping table and a parameter table according to a correct result; the query module encapsulates the mapping table into an SQL statement after receiving the mapping table, and verifies the encapsulated SQL statement; the noise adding module acquires a final query result of the query module and calculates noise adding sensitivity according to the parameter table; according to the invention, the security of data privacy is ensured, and the availability of the data is not influenced by the added noise.

The invention discloses an application method of a multistage-mapping-based large-scale multi-copy distributed storage system. The problems of data hash imbalance, incapability of supporting copies and node weights, great difficulty in management and the like of the large-scale distributed storage system in the prior art are solved. The multistage-mapping-based large-scale multi-copy distributed storage system comprises a storage node cluster, a management node, a client and a regular node cluster, wherein the storage node cluster is used for storing resources; the management node and the client are connected with the storage node cluster respectively; the management node manages the storage node cluster; the client acquires the storage positions of the resources according to a hash mechanism; and the regular node cluster is connected with the management node and the client and managed by the management node, and provides hash mapping rules for the client.

The present invention provides a method and system for protecting user privacy information against vertical attacks, which is suitable for a network system composed of an information collection terminal and several information providing terminals. , after denoising, the information provided by each information provider is obtained. The present invention realizes that when the overall data frequency information is counted, the collector cannot directly obtain the user's private information through the data report sent by a single information provider, and cannot obtain the user's private information by repeatedly collecting the data report of a certain user by using a vertical attack method User privacy; after all data reports must be aggregated, user privacy information must be counted through methods such as denoising and regression analysis, so as to take into account privacy protection and data availability, and improve privacy protection while increasing data availability.

The invention discloses a method for creating redundancy array of disc RAID, comprising the following steps: a disc storage controller combines at least two small-volume discs into a virtual disc, creates RAID according to the virtual disc and a large-volume disc, strips the RAID and reads and writes data with the striped RAID. In the invention, when discs of different volumes are available, the small-volume discs are combined together to form the virtual disc for creating the RAID with the virtual disc and the large-volume disc, thereby increasing the use ratio of useful space of discs; besides, the usability of the whole RAID is not affected when two discs in different positions of the virtual disc are damaged.

The invention discloses a method and system for quickly recovering from a virtual machine fault. By backing up the virtual machine address mapping table, the physical page of the host machine corresponding to the virtual machine is set as read-only, and the copy-on-write technology is used to realize the content of the physical memory of the virtual machine corresponding to the host machine. protection, the virtual machine can quickly recover to the state of the previous backup of the virtual machine after a failure. The invention has the advantages of small amount of backup data, fast backup and recovery speed, etc., and ensures the reliable operation of the virtual machine.

A service providing method and system for a database. The method comprises: when a master database server (301) receives a service providing request of a client, changing data in a database according to the service providing request, writing change information about the database into a first transaction log, and sending the first transaction log to a slave database server (302); and when a network connection between the master database server (301) and the slave database server (302) is disconnected or times out, or when the number of accumulated transaction logs, failing to be successfully sent, in the master database server (301) exceeds a pre-set value, or when the sending time of the first transaction log exceeds a pre-set time, the master database server (301) transmitting the first transaction log or information about an update object corresponding to the first transaction log to a buffer region (303). It can be seen therefrom that when a standby database temporarily cannot receive a log, a master database sends the log to the buffer region (303) so as to prevent the log from being lost.

The invention discloses a multi-tenant-oriented cloud network system. The cloud network system includes: a computing node, a virtual router cluster, and a cloud gateway. The virtual machine included in the computing node exchanges messages with the public server in the private network through the virtual router cluster; and, the virtual machine communicates with the virtual router cluster and The cloud gateway realizes message exchange with the public network; wherein, the virtual router cluster includes at least two virtual routers, and each of the virtual routers issues the same IP address to the private network switch; the cloud gateway includes at least two gateway nodes, each The gateway node publishes an equivalent default route to the private network switch, and each of the gateway nodes publishes the same floating IP address to the public network router or public network switch, so as to realize the cluster expansion of the cloud network system, and avoid the problem caused by a single node Failures affect the availability of the entire network, improving the network's attack defense capabilities.

The invention provides an IoT-based perimeter vibration alarm system to solve the low overall processing efficiency of a conventional alarm system due to the sensor structure in the conventional alarmsystem. The IoT-based perimeter vibration alarm system includes a vibration sensor for forming vibration measurement signals in associated directions in an associated enclosed space; and a data repeater for providing a re-routable data transmission link for the vibration measurement signals. The enclosed space reduces the interference factors of an acquisition environment. Forming a plurality ofassociated acquisition directions for vibration states in the enclosed space can comprehensively acquire the vibration states in all directions, so that the acquired signals of respective associated acquisition directions include the associated vibration information in the same vibration direction that can be quantified, thereby providing additional associated vibration information for subsequentsignal processing, and reducing the computational resource consumption of association analysis between vibration signals. Further, by the re-routable data transmission links, the increase or decreaseof the sensors does not affect the availability of the transmission link, thereby reducing system maintenance cost.

The invention relates to a method and a device for message processing. The device comprises an authority management unit, a message routing unit, a message management unit and a message transmitting and receiving unit. When one process needs to be implemented by a first client side, an application is sent to the message processing device, whether the first client side has the authority of access to a domain established by the authority management unit is judged by the authority management unit according to a username and a password input by the first client side, and if the first client side has the authority of access to the domain established by the authority management unit, a message routing unit and a message management unit required for the process are selected from message routing units and message management units specified by the domain with a process corresponding to the username and the password input by the client side, a corresponding relationship to the process is established, and the selected message routing unit and the selected message management unit are bound by set binding rules. The method and the device have the advantages of good universality and portability.

The invention provides a method for detecting faults of an anti-surge device in a train automatic control system. The method comprises that an input acquiring circuit acquires a ground signal in a circuit and detects whether a signal is outputted by the output end of the input acquiring circuit; if a signal is outputted, it is determined that short circuit occurs to the anti-surge device; and that if no signal is outputted, it is determined that short circuit does not occur to the anti-surge device. According to the method for detecting faults of an anti-surge device in a train automatic control system, fault detection on the anti-surge device using the input acquiring circuit in the train automatic control system does not need additional components and parts, does not influence the availability of the train automatic control system, and does not generate external wire tangle.