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The role-based access control model, often related to the permissions of hierarchical role. The encryption mechanism was introduced to this article, put forward a hierarchical management program of the role master key which based on the elliptic curve, to carry out the key management of the objective resources by the role master key, to realize the mechanism of hierarchical role character in the RBAC...
Retinal image registration is essential and crucial for ophthalmologists to diagnose various diseases. A great number of methods have been developed to solve this problem, however, fast and accurate retinal image registration is still a challenging problem since the great content complexity and low image quality of the unhealthy retina. This paper provides a new retinal image registration method based...
The researches of imaging algorithms for synthetic aperture radar (SAR) is focused on the air- and space-borne SAR from the theory of SAR was formed . In this paper, we propose a modified frequency scaling algorithm for missile-borne SAR imaging. According to the characters of missile-borne SAR including high flight speed, non-straight movement with non-constant velocity and big squint angle, which...
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