8results about How to "Reduce vulnerability" patented technology

The invention discloses a multi-objective optimization design method for a grey-green coupling facility. The method comprises the following steps: S100, collecting and cleaning multi-source data, performing coordinate unification, establishing a digital base data set, and setting regional parameter correction and historical disaster fingerprint calibration; s200, quantifying the regulation, storage and drainage operation rule into an optimizable dynamic variable; s300, establishing a parameterization mechanism model of the grey green facility and a connecting component, coupling life period evolution of degradation-operation and maintenance recovery, and outputting hydraulic power and risk indexes; s400, setting a Level-0 hard constraint and a robust constraint by taking the minimum flood response speed and the minimum full life cycle net cost as a core target; s500, carrying out iteration by adopting NSGA-II / III (Non-dominated Sorting Genetic Algorithm-II / III) to obtain a Pareto non-dominated feasible solution set; s600, calculating a comprehensive risk index based on the risk result and generating a partition and differentiation layout template; and S700, screening a unique recommendation scheme according to the grading evaluation system in combination with AHP-entropy weight coupling weight and landing correction, and outputting engineering accessories such as a parameter list and an operation and maintenance plan.

The invention belongs to the technical field of solid propellants, and particularly relates to a hydroxyl-terminated polybutadiene propellant and a preparation method thereof, and the propellant comprises the following components by mass: 6.5-8.5% of an adhesive; 3.0-4.0% of a plasticizer; 0.3-0.4% of a curing agent; 0.1%-2.0% of a combustion rate regulator; 0.01%-0.5% of a bonding agent; 15-19% of metal fuel; 5-18% of a nitramine explosive; 55-65% of an oxidizing agent; wherein the adhesive is a mixture formed by mixing hydroxyl-terminated polybutadiene and carboxyl-terminated polybutadiene in a mass ratio of (4-1.5): 1, and the burning rate regulator is a mixture of ferrocenecarboxaldehyde and copper phthalate and / or ferric oxide; the response grade of the hydroxyl-terminated polybutadiene propellant to a bullet shooting test, a fragment impact test and a shaped charge jet impact test is combustion.

The utility model is suitable for metal processing equipment technical field provides a kind of mechanism of cover steel seal stamping lock catch, mechanism includes rack, stamping drive arrangement, detachable punch assembly, swing arm, push rod, fixture, pull rod and tension spring etc., and stamping drive arrangement includes motor, belt pulley, belt and the cam structure consisting of cam and bearing.Its working principle is: motor drives belt pulley and cam rotation by belt, bearing on cam drives swing arm swing by connecting rod, swing arm drives push rod and steel seal die to complete stamping action, reset is realized through tension spring simultaneously, and automation processing is realized by cooperation material conveying platform.The mechanism positioning is accurate, impact force is controllable, and degree of automation is high, and it can adapt to different specifications workpieces, effectively improve processing efficiency, and reduce production cost.

The invention discloses a verifiable electronic health record ciphertext search scheme in a cloud-assisted electronic environment. The method comprises the following steps: (1) a system establishment stage: a trusted center (such as a government) BC determines a security level and establishes system parameters; (2) a key generation stage: the trusted center authenticates actual identities of the DO and the DU and issues valid certificates respectively; and (3) an updating stage: the DO encrypts the file and the index, generates proof of all keywords, and sends ciphertext of the file and the index to the CS. The certification of the keyword is publicly verified after being submitted to the BC. And (4) a trap door generation stage: the DU generates a search trapdoor of a request keyword, and sends the search trapdoor to the CS through the block chain. And (5) a search stage: the CS searches all matched search results and returns the search results to the DU through the BC. And (6) a verification stage: any participant can verify the correctness of a returned result according to the keyword proof sent by the DU and the corresponding trapdoor. And (7) a decryption stage: after receiving a result returned by the BC, the DU decrypts the result to obtain a corresponding index.

The application discloses an electric propeller, an aircraft and a cluster control method, relates to the technical field of aircrafts, and discloses the electric propeller, which comprises a propelling main body, a capturing mechanism and a propelling device, the propelling main body comprises gas inlets and ion outlets arranged at two ends of the propelling main body, the gas inlets are communicated with the external environment to supply gas into the propelling main body, and the ion outlets are communicated with the external environment; the capturing mechanism is arranged in the propelling main body and close to one side of the gas inlets, and can capture gas in a rarefied atmosphere; the propelling device is arranged in the propelling main body and close to one side of the ion outlets and is communicated with the capturing mechanism, can ionize the gas captured by the capturing mechanism to obtain environmental gas ions, and can discharge the environmental gas ions after acceleration from the ion outlets, so that a large amount of propellants carried with the aircraft is not needed, long-term tasks can be completed, and the application range is wider. The aircraft disclosed by the application can reduce the launch mass and cost of the aircraft, and the cluster control method can reduce the vulnerability of the aircraft system.

This application provides a zero-trust gateway data access method, client, gateway, communication system, storage medium, and computer program product. The method is applied to a client and includes: sending a single-packet authorization request message to the zero-trust gateway; receiving a single-packet authorization response message including ciphertext of a first key factor; decrypting the first key factor using a first private key; sending the first authentication information and the second key factor ciphertext to the zero-trust gateway, so that the zero-trust gateway generates a session key based on the first and second key factors using a preset algorithm; simultaneously, the client also generates a session key based on the first and second key factors using a preset algorithm; and establishing a connection channel with the zero-trust gateway based on the session key. This application uses a zero-trust gateway, which offers high security; and the data packet structure is designed with privacy in mind, resulting in fewer vulnerabilities and a lower risk of attack.

The invention discloses a multi-scene simulation verification and multi-objective optimization method based on a power distribution network protection scheme, and the method comprises the steps: obtaining the multi-dimensional data of a power distribution network, enabling the multi-dimensional data to comprise the topology and equipment parameters of the power distribution network, the model parameters of a demand side energy supply system, and the parameters of a protection setting model, and carrying out the preprocessing of the multi-dimensional data; constructing a digital twinborn model based on the preprocessed multi-dimensional data; presetting a plurality of scenes based on the operation risk of the power distribution network, and generating scene variables through a random algorithm; constructing a simulation environment for each scene, starting the digital twin model to perform simulation in the simulation environment, and outputting a simulation result; constructing an evaluation index system, determining a weight by an analytic hierarchy process, and performing weighted calculation on a comprehensive evaluation value of a simulation result; and taking the comprehensive evaluation value as a target, iteratively optimizing a protection scheme and demand side resource configuration by adopting a multi-target genetic algorithm, searching a Pareto optimal solution, and ensuring that the scheme gives consideration to multi-target balance of safety, economy and environment.

A TEE system that includes a first platform that runs a first TEE, a second platform that runs a second TEE, and a merging unit that is adapted to merge a first output from the first TEE of the first platform, with a second output from the second TEE of the second platform, so as to form an output of the TEE system. The first TEE and the second TEE are based on different implementations. In this way, the security of the system is improved, as a malicious actor even be able to access "t" machines, still would not be able to retrieve the secret unless there are multiple exploitable TEE vulnerabilities on all executing TEE platforms at the same time.