99results about How to "Ensure security requirements" patented technology

The invention relates to an electronic contract off-line signing method based on a trusted third party. According to the electronic contract off-line signing method based on the trusted third party, an electronic signature digital certificate, a user private key and a contract proof public key are obtained from the trusted third party by a user; then, the Hash digest value of the electronic contract is calculated; the Hash digest value is subjected to encryption operation by the user private key and the proof public key; an encryption result is two strings of key sequences; finally, the key sequences and the digital certificate watermark of a signer are embedded into a signature picture; then signature picture embedded with the watermark is stamped to an electronic contract document. According to the electronic contract off-line signing method based on the trusted third party, which is disclosed by the invention, the requirement on the contract signing platform safety in the contract signing process can be favorably lowered, and the contract signing platform can finish the electronic contract signing process only by taking the responsibilities of approving and putting to the proof to the electronic signature without damaging the safety.

The invention provides a variable time scale optimization dispatching method for a microgrid, and aims to solve the contradiction between operating economy and photovoltaic fluctuations of a conventional unit on system reliability after photovoltaic grid-connection permeability is improved. According to the method, system power supply reliability is divided into two indexes, including safety and adequacy, and the indexes are quantized and converted into constraint criteria for changing time scale; a variable time scale coordination dispatching model is proposed to realize the conditions as follows: when photovoltaic predicted electric energy production fluctuation is relatively low, the time scale is enlarged to lower the economic operating cost of the system; and when the photovoltaic predicted electric energy production fluctuation is relatively high, the prediction accuracy is improved by reducing time scale so as to reduce the quantity of interruptible loads, so that reliability requirement of the system can be ensured.

A gravel-filling or a bypass gravel-filling tool comprises a filling assembly (1) and an exterior assembly (2). The tool is characterized in that the exterior assembly (2) comprises a switch short section (4) and a lower joint (17), both of which are arranged below an outer short section (3) and connected in sequence; a positioning lock spring (5) mounted inside the switch short section (4) and a sealing short section (6) below the positioning lock spring (5); a connecting lock spring (7), a lock ring (8), a conversion inner body (13), a uniflux valve (14) and a limiting short section (16) are connected in sequence under the sealing short section (6); a bypass filling sliding bush (9) and a filling bush (11) are mounted in the annular space between the switch short section (4) and the conversion inner body (13); a positioning ring (15) is arranged between the switch short section (4) and the limiting short section (16), and the filling assembly (1) is arranged inside the exterior assembly (2). The tool adopts the converting and filling structure and has the following characteristics: the tool can prevent blocking, sticking and filling interruption, and can be widely used in the technology of filling an oil well with gravel after oil exploitation.

The invention discloses a mobile phone charger and a safety authentication method and system thereof. When a mobile phone is connected with the charger for charging, wireless communication between the mobile phone and the charger is started, charging parameters of the mobile phone are obtained, and the mobile phone carries out step-by-step adjustment on charging currents according to charging parameters of the charger from small to large. The step-by-step adjustment is carried out in such a way that charging safety matching is performed from preset safe charging currents, an adjustment current scope is calculated according to the charging parameters of the charger, then maximum charging currents are determined according to a charging safety matching result, and finally, the mobile phone is charged according to the maximum charging currents. According to the invention, through safety matching on the charger, charging safety hidden trouble caused by an unauthenticated charger in a charging process can be eliminated, the demand for charging efficiency can be met, and the safety requirement for charging can be better guaranteed.

The invention discloses an intelligent mechanical system fault diagnosis method based on multi-level multi-mode feature extraction. The method comprises the steps that an original vibration sequence of a to-be-detected mechanical part is acquired; Performing first feature extraction on the original vibration sequence by adopting a principal component analysis method to obtain a first target sampleof the to-be-detected mechanical part; Carrying out second feature extraction on the first target sample by adopting a non-negative matrix factorization method to obtain a second target sample of theto-be-detected mechanical component; Two vibration sequence predictors obtained through training based on a PID neural network and an extreme learning machine are used for predicting the two target samples respectively to obtain two predicted vibration sequences, and weighted fusion is carried out to obtain a fusion prediction vibration sequence; And outputting the fault type of the to-be-detected mechanical part according to the fusion prediction vibration sequence by using an intelligent mechanical system fault classification model obtained based on training of the support vector machine. The method is high in mechanical part fault diagnosis accuracy and high in robustness and timeliness.

The invention is suitable for the technical field of terminals, and provides a method and device for guaranteeing the security of POS machine firmware. The method includes the steps that according to the type of a CPU, a loading mode corresponding to the type of the CPU is preset, and according to the loading mode, first stage starting firmware is loaded by selecting an embedded multi-medium card e MMC starting medium. With the method, loading from other starting media capable of being connected with the exterior can be avoided; it is prevented that through the starting media, the firmware in a POS machine is replaced or tampered, and therefore it is guaranteed that the POS machine meets the requirement for security.

The invention provides a safety linkage locking device for a quick valve of a pressure vessel. The safety linkage locking device comprises a locking hook, inclined iron, inclined face pad iron, a first hinge pin, a second hinge pin, a pull rod, a sliding ring, a third hinge pin, a fixing lifting lug and an air cylinder or oil cylinder. The sliding ring is driven by the air cylinder or the oil cylinder. The locking hook comprises the hook head end, the hook tail end and a bending rod connecting the hook head end and the hook tail end. The inclined iron is fixedly arranged at the hook head end. The inclined face pad iron is installed on a flange of the pressure vessel. The inclined face pad iron is matched with the inclined iron and the locking hook to form a hook mechanism. The hook tail end is connected with the sliding ring through the second hinge pin. The bending rod is connected with one end of the pull rod through the first hinge pin, and the other end of the pull rod is connected with the fixing lifting lug through the third hinge pin. The safety linkage locking device lowers the requirement for the processing and manufacturing precision of parts in the processing, manufacturing, debugging and using processes and is convenient to operate, and the linkage locking performance is stable and reliable.

The invention relates to a locomotive touch display system. The system comprises a plurality of touch displays, a communication module and a lower computer, wherein, each of the touch displays comprises a touch screen, a mainboard, a display screen, a backlight inverter unit and a power source, any one of the touch displays can be set as a host and the other computers are set as slaves based on setting, and the host exchanges data with the slaves by a TCP/IP network; the mainboard comprises a central processing unit, a touch control unit, a check and storage unit, a display driving unit, backup batteries and a plurality of outgoing interfaces; the communication module provides communication link between the touch displays and a lower computer, and the lower computer collects the data of various systems of a locomotive by a sensor package, inquires instructions based on the data of the host in the touch displays, transmits response data based on a communication protocol to control the operating logic of the locomotive, and transmits the response data to the touch displays by the communication module to display conditions of the locomotive. The locomotive touch display system meets the use needs of the current railway locomotives and user operation habits, is convenient for use and maintenance, and is applicable to the use of DF7-type locomotives.

The invention provides a cellular automata and chaotic mapping-based digital image encryption method and a decryption method thereof. The encryption method includes the following steps that: a 288-bit key is utilized to generate chaotic mapping parameters and cellular automaton evolution rules which are required by an encryption algorithm; pre-processing such as three-dimensional decomposition and blocking, is carried out on an original image; 3D chaotic mapping is adopted to scramble pixel positions; cross-exclusive-OR operation is performed on image blocks to be encrypted; and a 2D second-order cellular automata used for generating boundaries, which is provided by the present invention, is utilized to carry out iterative encryption on an unfolded plaintext, pixels are mixed, and iteration is repeated until an iteration requirement is satisfied; and reverse pre-processing is carried out, and blocked ciphertext images are combined into a ciphertext image.

The invention discloses an AVC (Automatic Voltage Control) system constant value regulation method based on probability statistics characteristic. The method comprises the following steps of firstly, extracting and loading related data system to a data warehouse; by virtue of denoised data, extracting AVC voltage reactive power historical data and AVC system constant value data of each area, calculating fluctuation ratio of voltage reactive power in each period, forecasting the voltage reactive power for one regulation cycle, and obtaining a voltage reactive power data forecasting sequence; calculating a comprehensive system risk probability value P; obtaining the AVC system constant value based on probability statistics characteristic according to upper and lower limit values of the AVC system in each area; and by virtue of the upper and lower limit values, performing analog emulational regulation test on the system according to the voltage reactive power data forecasting sequence, updating a data source of the data warehouse after operating for one regulation cycle, and repeatedly obtaining a new system constant value. The method provided by the invention dynamically and periodically regulates the system constant value, thereby enabling system regulation to besuitable for operation characteristics of a power system in different periods.

The invention discloses a nonlinear air spring. The nonlinear air spring comprises an upper cover plate, a support plate, air bags, an annular rubber pile and an abrasion plate; the support plate is coaxially arranged below the upper cover plate, upper and lower sub-openings are arranged at the air bags on the upper cover plate and the support plate, the annular rubber pile is coaxially bonded atthe bottom of the support plate, and the abrasion plate is fixed to the top surface of the support plate; the center position of the support plate is provided with a limiting projection that projectsdownwardly into an inner cavity of the annular rubber pile, the center position of a bottom plate of the annular rubber pile is provided with a limiting stop which protrudes upwards, the top surface of the limiting stop is a groove shape to form a limiting groove, the limiting protrusion extends into the limiting groove along the central axis and is not in contact with the limiting groove, the nonlinear air spring is characterized in that the limiting protrusion is sleeved with an elastic stop, and the elastic stop extends into the limiting groove and is not in contact with the limiting groove. The three-stage transverse nonlinear rigidity is realized, various line conditions are better adapted, and the safety requirement of a vehicle is guaranteed. The invention further provides a transverse rigidity design method of the nonlinear air spring.

The invention discloses a steel pipe sheet negative ring structure and an optimal design thereof. The steel pipe sheet negative ring structure comprises a steel pipe sheet negative ring comprising five steel pipe sheets. The invention relates to the technical field of steel pipe sheet negative rings. The steel pipe sheet negative ring structure and the optimal design thereof are provided. After soil pressure is applied to the steel pipe sheets at different optimized parts, the stress condition of the circumferential bolt group is changed between 11 MPa and 15 MPa. Therefore, the damage condition of the bolt is not considered. Commercial three-dimensional software and Abaqus simulation software are used for carrying out simulation analysis on structural stress distribution, displacement anddeformation conditions. Then the structural layout of the steel pipe sheets is optimized, the purposes that the structure is more reasonable, and the safety requirement is guaranteed are achieved, the whole structural optimization is designed and optimized on the basis of the principles of safety priority, practicability and economy, and the processes of machining, manufacturing, carrying, erecting, safe using and the like of the pipe sheets can be smoothly carried out.

The invention discloses a lifting stage control device and a control method thereof. The lifting stage control device comprises a master controller, a PLC (programmable logic controller), a plurality of servo motors, lifting platforms, pressure sensors, position sensors and rotating-speed sensors. The number of the lifting platforms is as same as that of the servo motors. The pressure sensors are arranged on the lifting platforms. At least one position sensor is arranged on each lifting platform. The rotating-speed sensors are arranged on the servo motors. The PLC is electrically connected with the servo motors. The servo motors are electrically connected with corresponding lifting platforms. The rotating-speed sensors, the pressure sensors and the position sensors are electrically connected with the master controller respectively. A display screen is arranged on the master controller. The lifting stage control device and the control method thereof have the advantages that lifting conversion efficiency of a stage and safety needs of performers during performance can be guaranteed, modification cost is low, and multiple operating modes of the stage in an unloaded or loaded state can be realized.

The invention belongs to the field of airborne embedded software, and particularly relates to an aircraft-ground network system file transmission service communication method. The method supports taking the ground as a server side and taking an aircraft as a client, wherein the aircraft initiates a registration request to the ground. Meanwhile, the method also supports taking the ground as a client and taking the aircraft as a server side, wherein the ground initiates a registration request to the aircraft. Thus, communication is established to perform data interaction. In an interaction process, a method of 'data request specific to data block (Block# field)' is adopted, so that the method is general to Ethernet connection, airport Wi-Fi access or a cellular network and even a transmission protocol for a parallel transmission link way of a plurality of paths of cellular networks; the blank of cross-link transmission protocol is filled up; a management process is fused with a data transmission process; and the business efficiency is increased effectively.

The invention relates to a natural film coating agent applied to food and healthcare products. The natural film coating agent comprises the following raw materials in parts by weight: 40-67 parts of cellulose ether derivatives, 3-32 parts of seaweed polysaccharides, 1-10 parts of natural pigments, 2-25 parts of micromolecular sugar alcohol and 4-15 parts of lecithin. According to the coating agent, natural plant materials are adopted, pollution of heavy metal lead and arsenic is very low and cannot directly influence the coating agent, and the actually measured heavy metal lead and arsenic content also meets the regulations and standards of food additives; the coating agent does not contain chemical synthesized materials and is free from harmful compounds and monomer residues, so that the requirements of the food and the healthcare products on the safety are fully met; main ingredients in the natural coating agent can be dissolved in water, so that an organic solvent does not need to be used in a coating process and the production cost is greatly saved; a water solution is used for performing a coating process, so that coated drugs do not contain organic solvent residues and the safety of the drugs is improved.

The invention relates to the field of energy storage power generation and discloses a wind-driven generator tower air storage device for compressed air energy storage. An existing wind-driven generator tower is combined with the compressed air energy storage power generation process, the space inside the structure of the existing wind-driven generator tower is utilized for storing compressed air, the wind-driven generator tower is integrated with a traditional compressed air energy storage power generation system, a large-capacity air storage space is obtained by connecting a plurality of wind generating sets in parallel, so that the problem of limitations of existing air storage devices is solved; meanwhile, the safety of the wind-driven generator tower is guaranteed, system economy is achieved as well, and the cost of an air storage device of a compressed air energy storage system is reduced.

The invention discloses an access credibility and rapid permission assignment based smart power grid access control method. The method comprises that a smart power grid system is deployed; a smart power grid dispatching center is in charge of distributing power to a data control center according to actual needs of a smart power grid data control center; a detection and authentication module of the smart power grid data control center sends detection and authentication information to a credibility computation module after access authentication is completed, the credibility computation module performs credibility computation processing on the detection and authentication information and transmits credibility computation results to an access granularity distribution module, and the access granularity distribution module performs fine granularity distribution according to the credibility computation results and performs mapping with a common permission set computation module and an advanced permission distribution module to obtain a final access permission range. According to the method, the credibility computation module is arranged, so that internal resources are prevented from being accessed illegally, and the system access safety is guaranteed. By means of the arranging of the common permission set computation module, the power grid permission distribution efficiency is improved on the premise that the safety is guaranteed.

The invention discloses a cross-laminated timber transshipping transportation device. The cross-laminated timber transshipping transportation device comprises multiple carrying vehicles, multiple pressing machines and transshipping vehicles moving along a transverse rail; a longitudinal rail is arranged on one side of the transverse rail, and the pressing machines are arranged on the other side of the transverse rail; the transshipping vehicles can be connected with the longitudinal rail when the transshipping vehicles move to the side face of the longitudinal rail along the transverse rail, and therefore the carrying vehicles can move onto the transshipping vehicles from the longitudinal rail or move out of the transshipping vehicles to move along the longitudinal rail; the transshipping vehicles can be connected with pressing machine rails arranged in the pressing machines when the transshipping vehicles move to material ports of the pressing machines along the transverse rail, and therefore the carrying vehicles can move onto the transshipping vehicles from the pressing machine rails or move out of the transshipping vehicles to move into the pressing machines along the pressing machine rails. According to the device, blank assembling can be conducted by fully utilizing the blank pressing time, blank assembling and blank pressing form good circulation, the condition that personnel and equipment are idle is avoided, the transshipping circulation transportation efficiency and the overall working efficiency are greatly improved, and the labor time is shortened; the safety is high, and the safety requirements on a timber production environment can be guaranteed.

A microprocessor system for controlling or regulating at least some safety-critical processes. A microprocessor system (50) for controlling or regulating at least some safety-critical processes, comprising: two central processing units (1, 2) integrated in a chip package; a first and a second bus system; at least one full memory (7) on a bus system; at least one test data storage device (51) on a second bus system having a reduced storage range compared to the full memory on the first bus system, and wherein storing test data linked to data in a memory (7) on a first bus system, the bus system comprising comparison and/or driver components allowing data exchange and/or data comparison between the two bus systems, and hardware The test data generator (4) is arranged at least on the second bus system, in which case at least part of the full memory on the first bus additionally uses the test data on the first bus and a further test data storage (5) Make a backup. The invention also relates to the use of the microprocessor system described above in a motor vehicle controller.

The invention discloses a self-adaptive three-step method-based truck formation driving following vehicle control method. A vehicle longitudinal dynamics equation is established according to a stresssituation of a vehicle in a running process; by using the vehicle longitudinal dynamics equation, taking expected vehicle distance deviation and speed deviation as state variables, and taking an expected output torque as a control variable, establishing a nonlinear state space equation; then establishing queue integral Lyapunov, and then based on this, establishing a form of a controller referenceinput signal; and based on a three-step method control theory, designing a controller, determining a parameter self-adaptation law of the three-step method controller, obtaining a control rate of thecontroller, determining an output control variable by the controller according to state information at each moment and in combination with an expression form of a control law, and applying the outputcontrol variable directly serving as a driving/braking torque signal to the controlled vehicle. A Lyapunov function method is used in a design process of a controller reference input, and the three-step method controller is used for adjusting the parameters of the controller in real time under the adjustment of the self-adaptive law.

The embodiment of the invention provides a vehicle lamp control method and an automobile, which relates to the technical field of vehicle control. The rainfall sensor determines the visibility level of the current environment according to the rainfall level and the light intensity level output from the sunlight sensor, a first double flashing light opening command is sent to the BCM when the visibility level does not exceed a preset level, and a second double flashing light opening command is sent to the BCM when the airbag controller judges that the vehicle is in collision; the BCM executes asecond double flashing light on command when the vehicle speed is less than or equal to a preset value. When the automobile speed is greater than the preset value, if the turn signal light on commandis received, the turn signal light on command is executed to control the left turn signal light or the right turn signal light on; if the turn signal light on command is not received, the first double-flashing light on command is executed. The automobile automatically switches on double flashes in the event of low visibility or collision in rainy weather and ensures normal use of the turn signalfunction.

The invention provides a private data distribution method based on proxy re-encryption, and the method is characterized by comprising the following steps: a ciphertext cA and a unique identifier GA corresponding to a public key pkA are stored in a server; wherein the data owner has a public key pkA, a private key skA and a plaintext m, the first data receiver has a public key pkB and a private keyskB, and the first data receiver sends the public key pkB to the data owner; the data owner uses the private key skA and the public key pkB to create a re-encryption key rkA-> B; according to the private data distribution method based on proxy re-encryption, data is distributed between a data owner and a data receiver; the two parties do not need to be online at the same time, the two parties cancomplete the operation by means of the method, the server does not need to obtain private data content of the two parties in the related operation process, and safety requirements of the two partiesfor private data are guaranteed.