22 results about "Chain system" patented technology

The invention relates to the technical field of automatic advanced control theory and application, and provides a non-matching disturbance suppression method and equipment based on an extended compensation function observer, and the method aims at a non-integral chain system with non-matching disturbance, carries out the order expansion processing of the non-integral chain system, and obtains an extended system for displaying and presenting the order derivative of the non-matching disturbance. Designing an expansion compensation function observer according to the expansion system, performing error analysis on the expansion compensation function observer, and selecting gain of the expansion compensation function observer according to a convergence principle of an expansion error equation; and a model compensation control strategy is designed according to the extended compensation function observer and the state error feedback, so that the non-matching disturbance of the non-integral chain system is inhibited. According to the method, the non-matching disturbance of which the order derivative approaches zero can be estimated, so that the limitation on the disturbance is greatly relaxed, and an anti-disturbance control solution with higher precision and wider applicability is provided.

Systems, devices, and methods for blockchain abstraction are provided. Via use of the exemplary systems and methods, transactions between one or more blockchains and one or more off-chain systems are made faster and simpler.

The chain system fixed-point resampling method belongs to the technical field of rotating machinery signal processing, and aims to solve the problems that the time domain signal regularity of a single chain link is poor, the dynamics characteristics of the whole system are difficult to directly reflect, and the frequency domain feature extraction cannot be performed. The method comprises the following steps: extracting original data of discrete motion units from multi-body dynamics simulation results; at the preset data monitoring point position of the system, the nearest discrete motion unit is searched as a monitoring unit in real time by calculation; according to the data type, one of a direct method, a synthetic method and an average method is adopted to process the original data of the monitoring unit, and feature data representing the dynamics state of the fixed position are generated; and finally, the feature data are written into a file in time sequence. The time sequence data of the fixed position are collected through the fixed-point resampling method, and the problems that the data is strong in contingency, poor in regularity, and difficult to perform in-depth frequency domain and statistical analysis due to tracking a single motion unit are solved.

The invention discloses a fixed-point resampling method for a chain system, belongs to the technical field of signal processing of rotating machinery, and aims to solve the problems that the regularity of a time domain signal of a single chain link is poor, the dynamic characteristics of the whole system are difficult to directly reflect, and frequency domain feature extraction cannot be carried out. The method comprises the following steps: extracting original data of a discrete motion unit from a multi-body dynamics simulation result; searching the nearest discrete motion unit as a monitoring unit in real time by calculating the distance at a preset data monitoring point position of the system; according to the data type, processing the original data of the monitoring unit by adopting one of a direct method, a synthesis method and an average method, and generating characteristic data representing the dynamic state of the fixed position; and finally, writing the feature data into a file according to a time sequence. According to the method, time sequence data of a fixed position is collected through a fixed-point resampling method, and the problems that due to tracking of a single motion unit, data contingency is high, regularity is poor, and frequency domain deepening and statistical analysis are difficult to carry out are solved.

The application relates to the field of automation advanced control theory and application technology, and provides a non-matching disturbance suppression method and equipment based on an extended compensation function observer.The method is used for a non-integral chain system with non-matching disturbance, the non-matching disturbance is subjected to an extended order processing, and an extended system with non-matching disturbance order derivative display is obtained; the extended compensation function observer is designed according to the extended system, error analysis is carried out on the extended compensation function observer, and the gain of the extended compensation function observer is selected according to the convergence principle of the extended error equation; and the model compensation control strategy is designed according to the extended compensation function observer and the state error feedback, so that the non-matching disturbance of the non-integral chain system is suppressed.The application can estimate the non-matching disturbance with the order derivative tending to zero, so that the restriction on the disturbance is greatly relaxed, and a more accurate and more applicable anti-disturbance control solution is provided.

A block chain system allows mining for new valid values in a system such as a computer game or computer-based trading card system. Instead of each new value being added to the block chain being equivalent, each new value is one of a plurality of possible choices.

The invention discloses a data processing method, device and equipment of a block chain system, a medium and a product. The method is applied to a node device of a block chain system, a multi-layer cache structure is arranged in the node device, the multi-layer cache structure comprises a plurality of hierarchies, the multi-layer cache structure is used for caching data of the block chain system according to the hierarchies, and the method comprises the steps that a data query request is received, the data query request is used for requesting to query first data, the data query request carries a first index value of first data; in response to the data query request, the priority of each level of the multi-layer cache structure is obtained, the query sequence of the levels is determined by the priorities of the levels, and the higher the priority of the levels is, the higher the query popularity of the index values of the cached data in the levels is; on the basis of the first index value, querying the first data in each hierarchy of the multi-layer cache structure according to the priority from high to low; and outputting a data query result. According to the embodiment of the invention, the data query efficiency of the block chain system can be effectively improved.

The invention provides a cross-chain system function evaluation method, which comprises the following steps of: deploying and starting a cross-chain system, and initializing the cross-chain system; obtaining system description information, system parameters and operation environment parameters of the cross-chain system, generating test case information, and constructing a test case based on the test case information; a universal adapter interface is requested, and a cross-chain information verification function and a cross-chain transaction atomicity guarantee function test are carried out; and recording an actual result of executing the test case by the cross-chain system, and comparing the actual result with an expected result of the test case to obtain an evaluation result of the cross-chain system. The invention further provides a cross-chain system function evaluation device, a computer readable storage medium and electronic equipment. According to the invention, based on a standardized process framework of parameter configuration, test execution and result processing, different types of block chain drives are developed for different test functions, so that the functions of different cross-chain systems are objectively and fairly evaluated.

The invention discloses a Sybil attack detection method based on machine learning in a block chain, and the method specifically comprises the steps: constructing a fixed-length binary code based on a time behavior sequence of an address, and fusing a Hamming distance, a global frequency difference and a local segmentation frequency difference, designing a customized distance measurement algorithm for measuring address time behavior similarity; an interaction sequence of the address and the block chain protocol is regarded as text data, and saliency features used by the protocol are extracted by adopting a word frequency-inverse document frequency technology; and a multi-stage density clustering model is constructed, and automatic clustering and identification of suspected Sybil addresses are realized. Compared with the prior art, the method has the advantages that the user-defined distance measurement and text feature modeling method is introduced, the accuracy and robustness of Sybil address recognition are effectively improved, the attack implementation difficulty is increased, the defense capability of a block chain system to Sybil attacks is enhanced, a new technical path is provided for on-chain security governance, and the method is worthy of popularization and application. The method has high practical value and wide popularization prospect.

The invention discloses an arbitration-assisted cross-fragment transaction fair verification method. The method is specifically implemented according to the following steps: step 1, initializing a fragment block chain system; step 2, cross-fragment transaction generation of the sender; step 3, the receiver makes a cross-fragment transaction response; step 4, constructing a k-player game mechanism; step 5, carrying out cross-fragment transaction arbitration; according to the method, the atomicity of cross-fragment transaction is realized by using a public verifiable secret sharing algorithm, and the final consistency of transaction verification results is ensured; a dynamic arbitration set design is introduced, and a k-player game mechanism is constructed to assist transaction arbitration, so that a correct and fair cross-fragmentation transaction verification result is realized, and the operation security and robustness of a fragmentation block chain system are improved.

The invention relates to the technical field of block chains, in particular to an assembly line consensus protocol based on inter-fragment cooperation in a block chain system, which realizes distributed cross-fragment verification based on 3PC (3rd Personal Computer) by using submission intention and submission proof, so that the system obtains higher security, and the user experience is improved. The ticket right of the Byzantine node in one fragment at most can be tolerated to exceed one third of the total ticket right of the fragment; the overall security of the fragmentation system is improved through a cross validation mechanism, the same number of nodes can be distributed to more fragments under the condition that the security hypothesis is the same as the traditional non-cooperative consensus protocol, and the expandability of the system is improved; according to the method, data required by cross validation is packaged by using assembly line blocks, so that an aggregation signature generated by each round of element voting can be used as QC of different stages of continuous six blocks, the average submission overhead of each block is reduced to one round of voting, and the additional consensus overhead brought by a cross validation mechanism is counteracted to a certain extent.

A blockchain system according to an embodiment comprises a plurality of peers. Each peer is provided with a control unit and an execution unit. The control unit reads an effective version from a recording unit, and launches the smart contract execution software for the effective version. Upon receiving a first transaction request including data to be subjected to smart contract processing, the execution unit processes the data to be subjected to smart contract processing by executing the smart contract execution software for the effective version, and records, in the blockchain, a first transaction record including the result of processing the data to be subjected to smart contract processing.

According to the consensus processing method in the block chain system, a consensus protocol operated by the block chain system supports election of a unique main node in each round of consensus, and the main node is used for proposing a block corresponding to the current round of consensus to other consensus nodes participating in the consensus; comprising the following steps: receiving a proposal block which is broadcasted by a main node and corresponds to a current consensus; broadcasting the proposal block to a plurality of consensus nodes randomly selected from the block chain system by the main node; iteratively carrying out multiple rounds of random sampling voting on the proposed block with other consensus nodes participating in the consensus; after each round of random sampling voting is finished, determining whether the number of rounds of random sampling voting with the voting result of voting passing reaches a preset threshold value or not; if the number of rounds reaches a preset threshold value, determining that the consensus for the proposed block is passed; and otherwise, continuing to carry out the next round of random sampling voting until the voting result is that the number of rounds of random sampling voting passing voting reaches the threshold value.

Systems, devices, and methods for blockchain abstraction are provided. Via use of the exemplary systems and methods, transactions between one or more blockchains and one or more off-chain systems are made faster and simpler.

The application relates to a security control method for a non-integrity constraint chain multi-agent system under a Dos attack. 1) A communication topology graph of a multi-agent system is defined based on graph theory, an adjacency matrix and a Laplacian matrix of the communication topology graph are given, and the input assumption of a leader is considered under the Dos attack. 2) A detection mechanism of a Dos attack model is established, a high-order chain multi-agent system dynamic equation is considered, and an observer is developed to estimate the leader information in a limited time. 3) By establishing an elastic distributed observer nonlinear protocol, the consistency tracking control problem of a chain system is converted into the tracking control problem of a single chain system. 4) Based on the backstepping control, it is proved that, for the given leader and follower chain dynamic equations, the safe consistency tracking in a limited time is realized under the Dos attack.

The invention discloses a node switching method, device and system and a computer readable storage medium, and belongs to the field of main and standby node switching, in the invention, a standby node can periodically read a heartbeat signal newly written by a main node in a block chain system, and then under the condition that the read heartbeat signal reflects that the main node is not survived, the standby node can be switched to the standby node; according to the method and the device, the data fingerprint newly written by the main node in the block chain system is read, and the self is upgraded to the main node of the computer system under the condition that the read data fingerprint reflects that the main node is consistent with the overall data of the self, and due to the standby node in the method and the device, the self can be upgraded to the main node of the computer system without depending on a network between the main node and the standby node. Through the heartbeat signal and the data fingerprint in the block chain system, the survival state of the main node and the data consistency between the main node and the standby node are verified, even if the network between the main node and the standby node is disconnected, the standby node cannot be blindly upgraded to the main node, and the brain split condition and the data conflict are avoided.

The invention relates to the technical field of data storage and traceability, in particular to a block chain-based multi-modal data hierarchical storage and traceability system, which comprises one or more processors, one or more memories and functional modules driven by the processors, computer readable codes are stored in the memory, and when the one or more processors run, the computer readable codes enable the one or more processors to drive the function modules to run cooperatively, so that collaborative traceability of multi-modal data is realized; through the adaptation module, the storage granularity and position can be dynamically adjusted according to the data semantic value and the node real-time state, while the data accessibility is guaranteed, the overall storage pressure and synchronization delay of the block chain system are significantly reduced, and the game module introduces a weighted decision mechanism based on node reputation.

1. The name of the design product: the main body of the chain link. 2. The use of the design product: the assembly of the chain in the chain system for transportation and power supply. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design. 6. Other circumstances that need to be explained: this application is a partial design, and the part shown by the dashed line in each view is not claimed.

This invention discloses an improved extended state observer model-free control method for random load disturbance conditions, relating to the field of speed control technology under nonlinear loads and disturbance conditions. The method includes: establishing the mechanical motion equations of a coal unloading crawler device; the coal unloading crawler device consists of a chain system, a scraper bucket, a tensioning mechanism, a drive motor, and a main frame; establishing a hyperlocal model of the coal unloading crawler device based on model-free control theory and rewriting the extended state equations; addressing the limitations of the finite difference method by introducing an extended state observer to estimate all unknown dynamics in real time; and introducing a compensation function to construct an improved extended state observer, correcting estimation errors, thereby designing a model-free controller. This invention proposes an improved extended state observer structure, which suppresses high-frequency noise interference in disturbance estimation by introducing a filtering compensation mechanism, improving the observer's frequency domain performance and the system's dynamic response speed.

Provided in the present description are methods and apparatus for cross-chain resource transfer in a cross-chain system, and a system. A cross-chain system comprises a first blockchain and a second blockchain; a first resource contract, a first transition contract and a first cross-chain contract are deployed on the first blockchain; a second resource contract, a second transition contract and a second cross-chain contract are deployed on the second blockchain. A method is executed by a node of the first blockchain and comprises: receiving a first transaction which calls the first resource contract, the first transaction instructing transfer of a first resource from a first account of the first blockchain to a second account of the second blockchain; and, on the basis of the first transaction, transferring the first resource from the first account to the first transition contract, calling a transmission interface of the first cross-chain contract by means of the first transition contract, and transmitting a cross-chain message to the second blockchain, the cross-chain message being used for instructing transfer of the first resource to the second account by means of the second resource contract and the second transition contract.

The invention discloses a cross-chain smart contract execution tracking system and method based on identity binding, relates to the technical field of block chain cross-chain, and aims to solve the verification black box problem of opaque execution process and difficult auditing in the existing cross-chain system. The method comprises the steps of obtaining an identity label and a contract parameter of a calling request; collecting stage data in each predefined cross-chain logic stage, and constructing a process state sequence in sequence; performing causal logic verification on the sequence to ensure that time and state logic are consistent; after the verification is passed, generating a unique track data unit in combination with the identity and parameters; the units are sequentially Hash-linked and stored as an execution track chain which cannot be tampered; and rapid retrieval and audit output based on identities or contract addresses are supported.

The invention provides a block chain contract calling routing method and device, equipment and a storage medium, and relates to the technical field of contract calling. The method comprises the following steps: abstracting a life cycle of an intelligent contract on a chain to obtain a plurality of continuous contract cycle stages; a contract interface of each contract period stage is defined, and the contract interface is integrated to a block chain system in a plug-in form; calculating contract metadata of the smart contract, and encapsulating the metadata on a source code of the smart contract to obtain a contract route; obtaining a contract calling request of a transaction, and matching a corresponding contract virtual machine through a contract route; and finally, starting the contract virtual machine to respond to the request, executing the transaction and returning an execution result. According to the method, the life cycle of the intelligent contract on the chain is abstracted into a plurality of stages, and the interface is integrated to the block chain in the form of the plug-in, so that the capability of dynamically expanding the contract virtual machine is realized, and meanwhile, the association binding relationship is established between the contract type and the virtual machine, so that intelligent routing of contract calling is realized.