13results about How to "Secure transmission" patented technology

The invention relates to a BD-RIS-based auxiliary satellite RSMA system safety performance improvement method. The method comprises the following steps of: decomposing information to be transmitted into a public stream and a private stream by using an RSMA technology according to a cascade channel coefficient from a satellite to a legal user and an illegal node, and calculating a receiving signal-to-noise ratio of the two parties so as to obtain a public stream communication rate and a private stream communication rate of the legal user and an eavesdropping rate of an eavesdropper. And constructing a target function according to the rates, and establishing a BD-RIS reflection coefficient and satellite emission beamforming vector optimization model in combination with a preset loss function. And solving by adopting a double-circulation PDD algorithm, splitting the problem through a BCD method, processing non-convexity through SCA, firstly relaxing symmetric unitary constraint of a reflection coefficient matrix, and then projecting to obtain an optimized vector and matrix. By adopting the method to calculate the system security transmission rate, the security performance is enhanced.

This invention discloses a fiber Bragg grating level sensor based on liquid pressure conversion, comprising a fiber Bragg grating demodulator, a 2×1 fiber coupler, a transmission fiber, and a sensing unit. The sensing unit consists of a strain-sensing fiber Bragg grating, a temperature-compensated fiber Bragg grating, a sealed cylinder, a support beam, a pressure block, a pressure tension frame, a sealing membrane, and a stop. The pressure block and the pressure tension frame convert liquid level changes into longitudinal displacement changes, causing axial strain in the strain-sensing fiber Bragg grating. This results in a drift in the center wavelength of the strain-sensing fiber Bragg grating, and the liquid level height of the container is measured by monitoring this wavelength change. This invention eliminates the influence of temperature on the liquid level measurement results through a temperature-compensated fiber Bragg grating, offering advantages such as a large measurement range, good practicality, simple structure, low cost, good stability, high sensitivity, and safety and reliability, meeting the needs of measuring liquid levels in large storage tanks and other applications.

This utility model relates to the field of brake calipers, and discloses a built-in brake clamping force transmission module assembly and its brake motor assembly. The clamping force transmission module includes an upper module and a lower module, with upper and lower pins respectively injection-molded in the upper and lower modules. The upper and lower pins are electrically connected via a flexible flat cable. Several PCBA elastic contact pins are mounted on the PCBA board, and a pin module is provided on the force sensor. The pin module includes several sensor elastic pins for transmitting brake clamping force signals. The sensor elastic pins are connected to the lower pins, and the PCBA elastic contact pins are connected to the upper pins, so that the signal emitted by the force sensor is transmitted to the PCBA through the clamping force transmission module. In this utility model, the clamping force transmission module, PCBA, and force sensor are all connected by elastic pin contacts. When the elastic pin contacts are connected, precise alignment is not required during assembly, reducing the requirements for the production and assembly accuracy of related components, simplifying the assembly process, and avoiding losses caused by improper assembly.

The utility model relates to low -voltage cable technical field discloses waterproof shearing force resistance low -voltage cable, including cable body, the inside of cable body is provided with conductor layer, the outside of conductor layer is provided with insulating layer, the outside of insulating layer is provided with water -resisting rope, the outside of water -resisting rope is provided with inner shield layer, the outside of inner shield layer is provided with outer shield layer, the outside of outer shield layer is provided with water -resisting layer, the outside of water -resisting layer is provided with ultraviolet protection layer, the outside of ultraviolet protection layer is provided with shearing force resistance layer, the outside of shearing force resistance layer is provided with fire -resistant layer, the outside of fire -resistant layer is provided with sheath layer, in the utility model, realized the effective improvement of cable's performance, makes it can safely and reliably transmit electric energy under complex and harsh environment, improves the service life of cable.

The utility model belongs to the technical field of aluminum door and window processing, and particularly relates to an assembly roller line body device capable of automatically conveying small door and window frames, which comprises a rack, the top end of the rack is fixedly connected with a table-board frame, a plurality of first rollers are rotatably mounted on the inner wall of the table-board frame, and the side wall of the rack is fixedly connected with an air cylinder support. A cylinder base of a telescopic cylinder is hinged to the cylinder support, one end of the table top frame is hinged to one end of a turnover frame, a connecting support is fixedly connected to the inner wall of the turnover frame, an inclined lug base is fixedly installed on one side of the connecting support, and a fisheye bearing base is fixedly installed at the output end of the telescopic cylinder. One end of the fisheye bearing is sleeved on the inclined lug base; by means of the automatic transmission device, safe and effective passing of personnel between door and window assembly line groups can be guaranteed, effective and automatic transmission of small-size window frames can be achieved, the utilization rate of the assembly lines is increased, the productivity is improved, and the problems of cost and efficiency such as caching and shunting caused by window type classification are reduced.

The application discloses a kind of three-level n-dimensional digital twin systems supporting coupling operation of coal mine robot group, including terminal layer, edge layer and cloud end layer three levels.The robot group in terminal physical layer generates single-machine behavior level twin in terminal virtual layer based on real-time data through terminal AI model, realizes virtual and real two-way control, and field operator obtains augmented information through AR equipment, feeds back decision-making opinion, and multi-modal control node;Edge virtual layer generates collaborative task level twin based on single-machine behavior level twin, and constructs n-dimensional edge twin system through edge AI model.The computer host of cloud end physical layer provides computing power support for n-dimensional cloud end twin system, and centralized control operator accesses cloud end twin system through VR equipment, to realize remote monitoring and control;Cloud end virtual layer generates global planning level twin based on edge side data, and parallel analysis of n-dimensional cloud end twin system is realized through cloud end AI model, and the optimal global planning is comprehensively obtained.

This invention discloses a compensation method for a hybrid distribution transformer, relating to the field of transformer technology. It is applicable to interconnected transformers consisting of a first hybrid distribution transformer, an energy storage control device, and a second hybrid distribution transformer connected in sequence. The method involves acquiring the first three-phase operating data of the first hybrid distribution transformer, the second three-phase operating data of the second hybrid distribution transformer, and the current energy storage information of the energy storage control device based on a preset sampling period. Based on the first and second three-phase operating data, compensation information for the first and second hybrid distribution transformers is calculated. Based on the compensation information and the current energy storage information of the energy storage control device, the conduction direction and power flow direction of the energy storage control device are determined. The switching on and off of the interconnected transformers is then controlled based on the conduction direction and power flow direction to complete the compensation.

The application belongs to the technical field of wireless communication, and particularly relates to a RIS-assisted ISAC network transmission method based on hardware impairment and imperfect channel, which comprises the following steps: constructing an ISAC network system model based on RIS assistance; constructing a target function with the maximization of perceptual beamforming gain as an optimization target; constructing a perceptual beamforming gain maximization model in combination with four constraint conditions of user signal-to-noise ratio, eavesdropper signal-to-noise ratio, RIS amplitude and base station transmission power; and obtaining an optimal transmission scheme and performing data transmission by solving the perceptual beamforming gain maximization model; the application realizes the maximization of perceptual beamforming gain under the premise of considering HWIs and imperfect CSI, and can safely transmit user information while guaranteeing the robustness of the system.

The application discloses a Bluetooth transmission method and system, the method comprises the following steps: sending a plurality of Bluetooth data packets while detecting Bluetooth connection; after sending the Bluetooth data packet each time, judging whether the ACK response is correctly received; if yes, increasing the initial maximum transmission window of Bluetooth in response to the correct reception of the ACK response; if not, using dichotomy to find the optimal window size of the current transmission between the initial maximum transmission window and the transmission window threshold, the transmission window threshold being smaller than the initial maximum transmission window; repeatedly calculating the optimal window size of several transmissions, and determining the best Bluetooth transmission window based on the optimal window size of several transmissions for data transmission; the application can improve the efficiency of Bluetooth transmission data.

The utility model relates to a net bag shaped submarine cable protection structure comprising a protection net bag and aggregate, the protection net bag comprises an upper layer protection net and a lower layer protection net, the aperture of the upper layer protection net and the aperture of the lower layer protection net are both smaller than the external diameter of the aggregate, and a filling cavity is formed between the upper layer protection net and the lower layer protection net. And the aggregate is filled in the filling cavity and forms a whole with the protective net bag. According to the protection structure, the flexibility and the deformability of the protection net bag are utilized, so that the protection structure can well adapt to fluctuation changes of submarine topography, the protection net bag can be tightly attached whether cables in a reef group area are suspended or complex landforms in a near-shore area, all-around protection is provided for the cables, and cable damage caused by topographic factors is avoided; and the broken stones filled in the protective net bag and the alloy steel wire rope net bag form an organic whole, so that external force can be dispersed and absorbed when the impact of water flow and sea waves is resisted, the cable is effectively prevented from being directly scoured and impacted, and the risk of cable exposure and damage is greatly reduced.

This invention discloses an automatic positioning device and method for a transport box, relating to the field of transport box positioning technology. It includes a conversion box body, with a transfer motor mounted on its side wall. The output end of the transfer motor is connected to a positioning motor base located inside a cavity. A positioning motor is mounted on the positioning motor base, and the output end of the positioning motor is rotatably connected to an electromagnet passing through the positioning motor base. The electromagnet is used to magnetically fix the transport box from the transmission tube. The positioning motor drives the electromagnet and the transport box to rotate relative to the positioning motor base, thereby adjusting the position of the transport box. The transfer motor drives the positioning motor base to rotate relative to the receiving tube, ensuring that the transport box on the positioning motor base is concentric with the receiving tube. This invention uses two sets of driving devices within the conversion box body to achieve position adjustment and direction of movement adjustment of the transport box, ensuring that the transport box is in an ideal position when it arrives at the receiving point.

A low-resistance lithium battery connecting terminal belongs to the technical field of connecting terminals, and aims to solve the problems of insufficient conductivity and high cost of existing lithium battery connecting terminals. The technical points are as follows: a detachable connecting column is arranged in the center of an insulating substrate, the wide head end of the connecting column has an internal threaded groove, the other end of the connecting column is sleeved with a cable with an annular connector and is locked by a fastening nut; the connecting column and the fastening nut are made of high-purity oxygen-free copper conductive base material, the surface of which is electroplated with a high-conductivity silver layer, and the surface of the high-conductivity layer is vapor-deposited with an extremely thin diamond-like coating film as a wear-resistant protective layer; the insulating substrate is detachably provided with a protective assembly. This structure reduces the terminal resistance, efficiently and safely transmits current, protects the high-conductivity layer to prolong the service life, and each component is detachable, facilitating installation, maintenance and replacement, and the insulating substrate and the protective cover enhance the safety in use.

This application discloses a communication method and apparatus, a storage medium, and an electronic device. The method includes: acquiring user account data sent by a blockchain node, wherein the account data includes at least the user's account identifier and whether the user has subscribed to satellite communication services; the account data is configured to be determined by the terrestrial operator's service platform and sent to the blockchain node for storage; synchronizing the account data to the satellite core network, so that when the user initiates registration with the satellite core network through a terminal device, the satellite core network verifies the user's roaming capability to indicate whether the user is allowed to use the terminal device for data interaction. This application solves the technical problem that there is currently no data synchronization mechanism between terrestrial operators and satellite operators, making it difficult to guarantee the effectiveness of communication control.