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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 2. Отображено 2.
29-08-2023 дата публикации

Video code stream encryption and decryption method and device

Номер: CN116668743A
Автор: ZHAO SHENG, CHEN SU, YU KAI, XIE LIANLIAN, LIU ZIXUE, ZOU WENLU
Принадлежит:

The invention relates to the technical field of video monitoring, in particular to a video code stream encryption and decryption method and device. The method comprises the following steps that video code stream data to be encrypted are obtained, a video code stream comprises a plurality of messages, and each message comprises a standard frame header and intra-frame data; the standard frame header is encrypted to obtain an encrypted frame header, a user-defined frame identification code is inserted into the message, the user-defined frame identification code and the encrypted frame header form encrypted information, and the encrypted information in each message is not repeated. According to the encryption method, only the frame header of the video data is changed, the frame header is encrypted, the number of frames is not increased, the special frame header can be quickly retrieved and decrypted, the operation is simple, and the calculation pressure is reduced.

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Номер записи: 1
04-07-2023 дата публикации

Machine-made sand vibrating screen fault detection method and system based on multi-factor comprehensive analysis

Номер: CN116383633A
Автор: TAN GUANHUA, WANG ZHENG, FAN QI, GAO BAISONG, TANG BIN, WANG XIAO, JIN LEI, ZHOU SHILONG, TANG JIANPING, LIU YONG, YANG JIE, YU KAI, LIU ZIXUE, YI LIFU, WANG ZICHENG, XIE LIANLIAN, PAN ZHAOMA, YANG XUEFENG, ZOU WENLU, YANG SEN, YU BO
Принадлежит:

The invention relates to the technical field of machine-made sand equipment fault monitoring and early warning, in particular to a multi-factor comprehensive analysis machine-made sand vibrating screen fault detection method and system, and the method comprises the steps: obtaining a data reference of a vibrating screen in a working state according to a sampling period; obtaining vibrating screen monitoring data according to the sampling period; comparing the working current of the vibrating screen with the working current sample of the vibrating screen to obtain a current difference value; and/or comparing the feeding rate of the vibrating screen with the feeding rate sample of the vibrating screen to obtain a feeding rate difference value, and finding out a data reference closest to the vibration data according to a comparison result; and extracting a maximum amplitude reference and a vibration frequency spectrum reference from the vibration data samples of the vibration screen closest ...

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Номер записи: 2