2,605 research outputs found
Authorization algorithms for permission-role assignments
Permission-role assignments (PRA) is one important process in Role-based access control (RBAC) which has been proven to be a flexible and useful access model for information sharing in distributed collaborative environments. However, problems may arise during the procedures of PRA. Conflicting permissions may assign to one role, and as a result, the role with the permissions can derive unexpected access capabilities. This paper aims to analyze the problems during the procedures of permission-role assignments in distributed collaborative environments and to develop authorization allocation algorithms to address the problems within permission-role assignments. The algorithms are extended to the case of PRA with the mobility of permission-role relationship. Finally, comparisons with other related work are discussed to demonstrate the effective work of the paper
Self-protected nanoscale thermometry based on spin defects in silicon carbide
Quantum sensors with solid state electron spins have attracted considerable
interest due to their nanoscale spatial resolution.A critical requirement is to
suppress the environment noise of the solid state spin sensor.Here we
demonstrate a nanoscale thermometer based on silicon carbide (SiC) electron
spins.We experimentally demonstrate that the performance of the spin sensor is
robust against dephasing due to a self protected machenism. The SiC thermometry
may provide a promising platform for sensing in a noisy environment ,e.g.
biological system sensing
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