2results about How to "Reduce rebuild time" patented technology

This invention discloses a method for reconstructing magnetoacoustic electromagnetic particle concentration images based on compressed sensing, belonging to the field of medical imaging technology. The method includes: acquiring voltage signals, reciprocal current density data, and vibration velocity data of the reconstructed region from the detection electrode based on a simulation model; constructing a linear equation between the voltage signal and the magnetic particle concentration distribution, and finding the optimal sparse basis; introducing a compressed sensing reconstruction method, constraining the magnetic particle concentration distribution through sparse priors, transforming the concentration distribution reconstruction problem into an optimization problem with regularization terms; solving the magnetic particle concentration distribution under the condition of consistent voltage measurement data; and plotting the solution based on the results. This invention enables rapid reconstruction of magnetoacoustic electromagnetic particle concentration images based on compressed sensing.

The application relates to a database backup machine incremental reconstruction idempotent retry method and device. The method comprises the following steps: dividing a reconstruction process into three stages of pre-preparation, intermediate transmission and post-closing, and allowing retry only in the first two stages; first calculating and persisting a master-standby common WAL consistency site common-checkpoint and a difference structure filemap, then sequentially copying a WAL, a serialized change-block mirror and a filemaptarget to a disk; after fault recovery, reverse serializing and continuing transmission, realizing incremental level idempotent retry; if the error context is the same for two times in succession, immediately converging. Through accurate retry control and state persistence, the application significantly reduces the full amount construction triggering probability, improves the data consistency guarantee capability, simultaneously has the non-invasive integration advantage, and can effectively improve the availability and operation and maintenance efficiency of a database system.