2results about How to "Maintain scalability" patented technology

The utility model discloses a bridge expansion joint's water stop device, features include multistage along the length direction of bridge expansion joint head -to -tail connected water stop unit, and water stop unit includes two support hanging plate, two connecting hanging plate and the open upward U shape elastic rubber water stop belt, two support hanging plate symmetrical fixed setting on the two side walls of bridge expansion joint, and the upper portion of each connecting hanging plate is suspended with the lower portion of corresponding one support hanging plate between through the suspension connection mechanism suspended connection, and the both sides of U shape elastic rubber water stop belt respectively upwards bending and through a plurality of detachable pressure device with the lower portion of one connecting hanging plate fixed seal connection, and the edge of the support hanging plate of two adjacent water stop units is mutually overlapped and fixedly connected between, and the edge of the U shape elastic rubber water stop belt of two adjacent water stop units is mutually overlapped and fixed seal connection between, advantage is convenient to install, easy to maintain, can gather and clean up sundries effectively and has strong adaptability.

This application discloses a blockchain-based multi-level encryption and access control system for medical data, including a medical data acquisition module, a medical data encryption module, a blockchain network module, an access control module, and a user processing module. It also discloses a blockchain-based multi-level encryption and access control method for medical data, including: acquiring medical data; applying a multi-level encryption strategy to process the data to obtain encrypted medical data, an encrypted symmetric key, and an initial hash value; generating a new block; uploading the encrypted medical data, symmetric key, and initial hash value to the new block; re-hashing the encrypted medical data and symmetric key; comparing the hash value with the initial hash value to verify that the data has not been tampered with; after verification, using a smart contract for access control; decrypting the symmetric key to decrypt the encrypted medical data; and accessing and managing the medical data through a user interface. This application can increase the difficulty of data decryption in the system, ensuring data integrity and security.