42results about How to "Guaranteed to be different" patented technology

The invention discloses a cloud storage ciphertext retrieval method and system. The method includes the following steps: (1) a step of generating a public key and a private key at a retrieval end; (2) an encryption step; (3) a step of generating a retrieval trap door; (4) a retrieval implementation step; (5) a decryption step. Through implementation of the cloud storage ciphertext retrieval method and system, the cloud storage ciphertext retrieval supports a retrieval strategy of nest of logic words such as AND, OR and NOT and the like and users are helped to accurately obtain needed data and thus the transmission cost is reduced and the method and system have the advantages of being simple in process and high in calculation efficiency. At the same time, the cloud storage ciphertext retrieval method and system adopt composite number order group and bilinear pairing for construction and thus known plaintext distribution regularity attacks and attacks targeted at access modes are effectively prevented and thus the security is comparatively high.

In the invention, when making a scramble code scheme for CDMA cell and selecting a scramble code for neighboring cell, the method comprises: selecting a time delay interval [t1, t2]; calculating the maximum value correlated to the scramble code group in time delay interval [t1, t2]; calculating the maximum value correlated to the complex code and its probability distribution to get the mean value and/or variance of maximum value correlated to t complex code; according the maximum value correlated to the scramble code and the mean value and/or variance of maximum value correlated to the complex code, selecting scramble code group to allocate.

The invention relates to a launching and recovery system for a small unmanned aerial vehicle. The launching and recovery system for the small unmanned aerial vehicle comprises a vehicle body; a launching chamber is formed in the rear side, close to the roof position, of the tail part of the vehicle body; a launching mechanism is mounted in the launching chamber; a recovery chamber is formed in therear part, close to the roof position, of the left side of the vehicle body; a recovery mechanism is mounted in the recovery chamber; a through groove, which is used for enabling the launching chamber to be in communication with the recovery chamber, is formed between the launching chamber and the recovery chamber; and a conveying mechanism is mounted in the through groove. The launching and recovery system for the small unmanned aerial vehicle has the advantages of good concealing performance and high maneuvering characteristic.

The invention provides an idempotence control method and device, electronic equipment and a readable storage medium. The idempotent device obtains feature information in an interface request sent to aserver by a calling end; and generating a token uniquely corresponding to the interface request according to the feature information of the interface request, triggering the server to perform serviceprocessing according to the interface request when the generated token does not exist, and enabling the server to give up the interface request when the generated token exists. In this way, idempotence of the interface request is effectively achieved, meanwhile, compared with the related technology, the calling end does not need to specially obtain the token once, and the process of the calling end is simplified, and the user experience is better.

The invention discloses a data generation method and device capable of prolonging the service life of a chip, wherein the method comprises the following steps: step A) acquiring a variable factor according to association information stored in a memory in the chip; step B) reading a hardware serial number of the chip; and step C) carrying out calculation on the variable factor and the hardware serial number to generate basic data. In addition, the step A) further comprises the modification of the stored association information. By adopting the method and the device, the problem of unsafety of an information system caused by the situation that the basic data generated by the chip at the fixed time are same can be solved and the reliability of the system is enhanced.

The invention relates to a login information encryption method and device. The method comprises the following steps of: when an operation action for triggering password input or account number input is detected, carrying out disordered arrangement on key characters in a virtual keyboard; receiving an account number or a password input by a user through the virtual keyboard after disordered arrangement is carried out on the key characters; and displaying the account number or the password as a preset pattern and/or a character on external display equipment. Through such a manner, the account number and password safety of users is greatly ensured. When users wear VR glasses, the virtual keyboard is adopted, so that being compared with an entity keyboard, the operation carried out by the users is more convenient.

The invention belongs to the technical field of optical fiber manufacturing, and particularly discloses a preparation method of a taper-core optical fiber with a gradually-changed core-to-package ratio and the taper-core optical fiber. The method comprises the following steps: depositing a glass particle loose layer on the inner wall of a reaction tube; performing rare earth ion doping on the glass particle loose layer; drying the reaction tube, conducting sintering at high temperature, so as to vitrify the glass particle loose layer, conducting fusing to form a solid preform core rod, and then polishing the solid preform core rod to obtain a conical core rod with a specified taper angle; and conducting processing to obtain a cylindrical glass rod which is provided with a conical hollow hole, combining the glass rod with the conical hollow hole with a conical core rod to obtain a conical core active optical fiber preform, and putting the conical core active optical fiber preform into a wire drawing tower for drawing to obtain the conical core optical fiber with a gradually changed core-to-cladding ratio. The taper core optical fiber is prepared by the method. The core-to-package ratio of the prepared taper core optical fiber with the gradually-changed core-to-package ratio is gradually changed along with the length of the optical fiber, pump light absorption of the optical fiber can be improved, optical fiber heat production can be balanced, and laser output power can be improved.

The invention provides an equipment identification method, device and system and a cloud server, and the method comprises the steps: obtaining the attribute information of target equipment uploaded by a local equipment end and the item information of the target equipment, obtaining an identification code of the target equipment according to the attribute information and the item information of the target equipment, and obtaining the identification code of the target equipment; and feeding back the attribute information, the project information and the identification code of the target equipment to the local equipment end. In the technical scheme, the attribute information and the item information of the target equipment are uploaded to the cloud end through the local equipment end, and the identification codes of the target equipment are uniformly generated by the cloud end and are fed back to the local equipment end, so that the identification codes of the target equipment can be ensured to be different from one another, and the problem that devices provided by different suppliers have the same identifier is avoided.

The invention relates to the technical field of vehicular audio coding., in particular to a method and system for realizing coding of plurality of automobile sound boxes based on a CAN bus, and the method comprises the steps that S1, a test tool is connected with different to-be-tested products through the CAN bus, and broadcasts coding commands with different node codes to the different to-be-tested products; S2, any to-be-tested product receives any coding command, obtains a corresponding node code, and responds to the test tool according to the node code; S3, the test tool sends an operation command with any node code and operation information; and S4, after receiving and executing the operation command, the corresponding to-be-tested product responds to the test tool. The invention mainly solves the problems that the efficiency is low and the advantages and efficiency of the CAN bus cannot be exerted because only one-to-one test and configuration can be performed when the existingvehicle-mounted equipment is subjected to delivery detection.

The invention discloses a test circuit composed of triode and belongs to the demonstration field of teaching tools. The test circuit is composed of a button-type circuit switch, a complementary pulse unit, a test hole, a tubular lifting circuit, a step voltage system, a display system, and a voice level. If a test capacitor is connected to the two ends of a test hole, the current which is produced by the complementary pulse unit runs through a frequency element under the test, then enters the tubular lifting circuit and is subject to amplification, and the output of the circuit excites the step voltage system, etc., and the display of sound and light is realized. The stronger the output signal is, and the brighter the display system is. The complementary pulse unit can become a pulse power supply form having frequencies, and can have a zero frequency, i.e., DC form. The button-type circuit switch provides an opportunity for audience to understand the physical phenomenon of capacitors and inductors in the presence of current and DC having frequencies, and provides dynamic effects which can attract the audience, develop the young's love for science, and helps to improve quality-oriented education for students.