37results about How to "Fast and accurate search" patented technology

Systems, methods and apparatus are provided through which, in one aspect, one or more wholes and parts of wholes are searched in a database, presented to a user, sold and / or distributed.

Systems, methods and apparatus are provided through which, in one aspect, one or more sub-products of a product are searched in a database, presented to a search, sold and / or distributed.

The invention discloses a keyword or multi-keyword based searchable encryption method and system. The keyword based searchable encryption method comprises the following steps: generating a public key in an encryption process according to a random parameter and a system public coefficient, then encrypting a keyword in a file through the public key and a private key to obtain a keyword ciphertext, and searching the keyword ciphertext according to a keyword input by a user to obtain a ciphertext required by the user. The keyword based searchable encryption method has the advantages of low computing expense, simple algorithm, high speed and suitability for multiple user models. The multi-keyword based searchable encryption method comprises the following steps: storing all keywords of each file through a structural tree, generating the public key according to the random parameter and the system public coefficient, establishing relations between all the keywords in the file and ciphertexts of the keywords through a hidden part of the structural tree according to the public key, and encrypting to obtain all keyword ciphertexts in the file, wherein for a plurality of keywords input by the user, a cloud ciphertext required by the user can be searched only if the ciphertexts of all the keywords are searched. The multi-keyword based searchable encryption method has the advantage of higher safety.

The invention relates to a hydrogen internal combustion engine ignition correct time calibration optimization system based on an L-M neural network and an optimization method thereof. The system comprises a data acquisition module, a signal conditioning module, a control unit, a power supply module, a clock module, a storage module, a performing unit, an interface circuit and a monitoring module. The control unit comprises a data processing unit and an ignition correct time optimization control module. The data processing unit performs neural network optimization training by utilizing an L-M optimizing algorithm according to all the condition parameters received by the control unit so as to obtain the optimal ignition correct time of the current condition and transmit the optimal ignition correct time to the ignition correct time optimization control module. The ignition correct time optimization control module transmits the received optimal ignition correct time to an ignition performer. Hydrogen internal combustion engine overall condition optimization control is accurately and rapidly performed based on the L-M neural network so that the error of ignition correct time calibration is low, speed is high, the ideal prediction effect can be achieved, and the system and the method thereof have important meaning for the experimental research of the hydrogen internal combustion engine.

The invention discloses an image storage system, which at least comprises an image capture device, an image capture control module, an upload module, an image storage module and a physical operation module, wherein the image capture device is used to establish image data; the image capture control module is electrically connected with the image capture device and is used to control the image capture device to obtain the image data; the upload module is electrically connected with the image capture control module and is connected to the Internet to transfer the image data; the image storage module is connected to the Internet to receive and store the image data; and the physical operation module is used to obtain physical information.

The present disclosure provides a zero-correlation linear cryptanalysis method, system, medium and electronic equipment, including the following steps: obtaining an adjustable block cipher to be analyzed; treating the obtained adjustable block cipher as a vector Boolean function, constructing plaintext, cipher The key sum adjusts the mapping relationship with the vector Boolean function, and sets the linear approximation expression of the vector Boolean function; searches for a linear approximation that makes the correlation value of the linear approximation expression zero, and distinguishes according to the obtained linear approximation, that is, zero correlation The device is converted into an integral distinguisher to judge whether the key used for reverse decryption is correct; wherein, the correlation of the zero-correlation linear approximation approximation expression is obtained by traversing all possible values ​​of the plaintext, key and adjustment; in this disclosure, the plaintext , keys and adjustments are treated equally, realizing fast and accurate search for linear approximation, can determine the accuracy of keys more quickly, reduce the complexity of decryption, and improve the success rate of integral attacks.