Search

With the explosive growth of medical data, the tendency to store medical data on cloud is extremely widespread. However, large-scale medical data have put great pressure on cloud storage systems since redundancy of data wastes much storage space and increases economic expense. Besides, security is also highly important for medical data stored in the cloud. In order to reduce redundancy and ensure security of medical data simultaneously, this study proposes an efficient and secure deduplication scheme ESDedup. Compared with existing works, the redundancy of medical data is summarized and denoising of deduplication is firstly presented to decrease the storage overhead. Afterward, the rewriting algorithm based on similarity instead of the time attribute eliminates more fragments. Meanwhile, the auditing strategy of blockchain is designed to promote the auditing efficiency and security. Experiments demonstrate that ESDedup not only promotes the scalability and system performance, but also improves the deduplication ratio by 55.9% compared with the state-of-the-art method. [ABSTRACT FROM AUTHOR]

The influence of storage conditions on the mechanical recycling of pre-consumer waste (PRE-CW) from the manufacture of multilayer packaging films starting from starch compounds using a renewable-based polymer with PCL and PBAT, which are biodegradable conventional-based polyesters, was studied. It was found that, unlike materials based on conventional-origin polymers that accumulate in the environment for hundreds of years, the studied compounds degraded, even in the solid state, duringstorage in unventilated spaces and during the rainy hot summers with alternatingheat and rain. The degradation of the mechanically recycled compounds obtained from PRE-CW stored in such conditions was highlighted by the comparative analysis with the primary compounds, which proved the following: specific FTIR spectra changes; 2–3-times higher melt fluidity than for primary compounds; melting in successive processes over the entire positive temperatures range, up to 115 °C, such as in cases of compositional de-mixing of incompatible blends, faced to a single melting endotherm with a maximum at around 120 °C for the primar thermal degradation with the movement of the main destruction stages towards higher temperatures; a high quantity residue at 750 °C in air; dispersed mechanical resistance properties y compounds; crystallization at temperatures 10 °C–15 °C higher. The elimination of storage before the mechanical recycling of the pre-consumer waste from this type of polymeric compound fabrication is a way to increase the mechanical recycling efficiency while obtaining new materials with functional properties required by the applications. [ABSTRACT FROM AUTHOR]