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In the preprocessing of digital image information hiding, the common scrambling method Arnold based on locational space canpsilat change the statistical character of an image. Because of using fixed form matrix, the image is detected and attacked easily. Combining with the Fermat number transformation matrix changeable, the fast algorithm like FFT and solving the inverse matrix simply, this paper...
Security management of geospatial data is a relatively unsolved problem in Geographical Information Systems. In this paper a new storage model for distributed GIS spatial data based on object-based storage (OBS) has been constructed, which gives an integrated solution to both offer high-performance storage services and secure data sharing. The mechanism is composed of three security protocols: GIS...
A new system of IPN hydrogels composed of diallyldimethylammonium chloride (DADMAC) and natural macromolecule, Kappa-Carrageenan (KC) were prepared by γ-irradiation. Their gel fraction and swelling behavior were studied. Elemental analysis and gel strength measurement results showed that there was an amount of KC that remained in the gels and the gel strength was enhanced obviously.
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