54results about How to "Good attack performance" patented technology

A multifunctional shield with guide grooves, relating to the field of police shields, comprising a shield body, a handle, a pad and an elbow locking fixture, the shield body includes a shield body front and a shield body back, the pad It is connected to the back of the shield body, the handle and the elbow locking fixture are connected to the shield body through the pad, the front of the shield body is convex, and the front of the shield body is provided with a left guide groove group and the right guide groove group, the left guide groove group is composed of a plurality of left guide grooves, the right guide groove group is composed of a plurality of right guide grooves, and the shield body also includes a longitudinal axis, so The left guide groove extends from the longitudinal axis to the left edge of the front of the shield body along the inclined downward direction of the outer convex surface, and the left guide groove group and the right guide groove group are arranged symmetrically along the longitudinal axis, The shield includes unloading mode and rebound attack mode when used.

The invention discloses a ship whole elastic-plastic movement response predication method and system under the action of underwater explosion. The method comprises the following steps: S1, simplifying a ship into a free ship body beam with an equal section; S2, dividing load pressure of the free ship body beam into five time phases under the action of the underwater explosion; S3, solving movement displacement of the free ship body beam in the five time phases under the action of the underwater explosion; S4, solving a bending moment of the ship body beam; S5, solving forward plastic movement parameters of the ship body beam; S6, solving backward elastic unloading movement parameters of the ship body beam; S7, solving backward plastic movement parameters of the ship body beam; S8, solving forward plastic movement parameters of the ship body beam. The invention further provides a system for realizing the method. According to the method and the system disclosed by the invention, the ship plastic movement process is analyzed on the basis of comprehensively considering the impact effect on the whole ship body by impact waves and air bubble loads, and engineering predication of ship whole elastic-plastic movement deformation under the action of the underwater explosion can be accurately and conveniently realized.

The embodiment of this specification provides a method and device for generating an adversarial sample. The method includes: obtaining the current adversarial sample to be strengthened in the current round of iterations; and presetting the first number of current adversarial samples in the direction of reducing the target loss function Geometric deformation to obtain a deformed image; perform a second pixel-by-pixel update on the deformed image to obtain the first adversarial sample; perform a third pixel-by-pixel update on the current adversarial sample to obtain a second adversarial sample; determine the first adversarial sample and In the second adversarial example, the adversarial example with a smaller loss value is used as an updated adversarial example; when the stop iteration condition is met, the updated adversarial example is used as the final adversarial example; when the stop iteration condition is not met, the next round is performed based on the updated adversarial example iterate. It can make the generated adversarial samples more aggressive, so as to provide targeted defense.

The invention discloses an active defense method applied to a network attack on an electric power control system. A virtual controller network, a virtual attack sample library and an attack sample generator are constructed through a black box method, and a virtual attack event is constructed, so as to investigate and repair the electric power system. , the active defense method of the present invention is easy to implement, easy to deploy in the power control system, so as to improve the stability of the system, and has a good effect on the investigation of concealed attacks.

An adversarial disturbance generation method for intelligent single intersection based on CW attack. According to the existing DQN algorithm in deep reinforcement learning, an adaptive intelligent traffic light model for controlling single intersection is trained. The degree of preference judges whether the current state has attack value, and generates adversarial samples based on the CW attack combined with the optimal gradient sorting and the discreteness of the input state (ie, the spatial distribution of the vehicle in the corresponding road section). Finally, through the smoothness of the traffic flow in SUMO, the vehicle Changes in queue length and overall waiting time test the effect of the attack. The invention reduces the probability of an attack being discovered, and the attack effect is good.

The invention discloses a shield with capture devices. The shield comprises a shield body, a handheld handle, a protection pad and an elbow locking and fixing device. The shield body comprises a shield body front face and a shield body back face, the protection pad is connected with the shield body back face, and the handheld handle and the elbow locking and fixing device penetrate through the protection pad to be connected with the shield body. The transverse section of the shield body front face comprises a top point and two side points, a top point intersection is formed by the top point, side point intersections are formed by the side points, side edges are formed from the top point to the side points, the height of the top point intersection is gradually reduced, the top point intersection stretches to the side point intersections to form side faces, guide grooves are formed in the side faces, the guide grooves comprise groove heads, groove tails and groove bodies, and the capturedevices arranged on the groove tails are bag-shaped capture devices. The bag-shaped capture devices comprise bag openings and bag bodies, the bag openings are provided with guide edges or expansion grooves, the bag openings are made of rigid or semi-rigid materials, and the bag bodies are made of anti-corrosion fiber materials.

The invention relates to a novel method for preventing DoS attack of a wireless disassociation frame based on a rough set, and provides a disassociation frame validity decision rule based on various types of characteristic attributes of an 802.11 frame, wherein the characteristic attributes mainly comprises nine parts: frame number difference, the type of a previous frame, a time interval between a frame and the previous frame, field control byte configuration, frame receiver address setting, frame sender address setting, BSSID setting, Reason Code setting, and Duration ID setting. The method comprises the steps: building a decision table for discriminating whether the disassociation frame is legal or not according to the research of WiFi wireless communication features and the attribute characteristics of the disassociation frame; carrying out the attribute reduction of a conventional method which employs nine condition attributes for discriminating whether the disassociation frame is legal based on the rough set theory, wherein the novel method just needs three condition attributes for judging the authenticity of the disassociation frame; and building a novel '802.11w-rough set filtering ' method, wherein the method can enable a WiFi LAN to effectively prevent the DoS attack of the wireless disassociation frame at low and high attack rates.

The invention discloses a ship whipping motion response prediction method and system under a combined effect of underwater explosive shock waves and bubbles. The ship whipping motion response prediction method comprises the steps that step 1, a ship is equivalent to a uniform cross section free ship body girder, and therefore the prediction of ship motion responses are equivalent to the predication of free ship body girder motion responses; step 2, the load pressure process of the free ship body girder under the underwater explosion effect is divided into five time phases, and a shock wave pressure peak value, a bubble pulsation phase negative pressure peak value and a bubble first time pulsation pressure peak value are collected; step 3, motion displacements in the five time phases of underwater explosion of the free ship body girder are solved. The invention further provides a ship whipping motion response prediction system. The ship whipping motion response prediction method and system comprehensively consider the shock effect of the shock wave and the bubble load on the whole ship, the underwater explosion load pressure is simplified to be five phases, the motion displacements of a ship in different phases are calculated, and therefore project prediction of ship elastic motion or whipping motion responses under medium and distal field explosion effect is achieved accurately, simply and conveniently.

The invention relates to a nano metal powder material, in particular to a special nano iron powder for damaging satellite through spraying which can lead a satellite to lose reconnaissance function for ever. The preparation method includes the steps as follows: processing raw materials into nano iron powder under the temperature of 10-5 DEG C below zero and under the condition of setting the high frequency cutting times as 4,500-5,500 times / minute, then respectively sorting the powder materials on which the particles ( D3 is equal to 41nm D25 is equal to 62.1nm D50 is equal to 125nm, D75 is equal to 177.2nm, and D97 is equal to 230.3nm) are distributed, cladding for anti-oxidation and processing the surface. 75 percent of aggressive nano iron powder particles can be deeply embedded in the surface of the whole satellite to completely cause the satellite blind.

The present invention provides a method and device for generating a directional attack adversarial patch. The method adopts a plurality of consecutive white-box models with different structures to iteratively update the adversarial patch, so that the obtained target general adversarial patch can be better for the black-box model with unknown structure. attack effect. By introducing the triplet loss, the success rate of the output target category can be improved during the directed attack. By introducing the attention shift loss, the migration effect of the target general adversarial patch to the model attention area can be improved, so as to greatly improve the directional attack effect of the target general adversarial patch. By introducing a smoothing loss, it is possible to reduce the gap between the pixel points of the target common adversarial patch, which is not easy to attract the attention of the human eye. Furthermore, by adding anti-patches, targeted attacks can be carried out at the physical and digital levels at the same time, which is easier to implement.