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On the role of roles

Proceedings of the ninth ACM symposium on Access control models and technologies, 2004
This paper maintains that for an access-control (AC) mechanism tosupport a wide range of policies, it is best to dispense with any built-insemantics for roles in the mechanism itself---be it the semantics of RBAC, orany other---leaving such semantics to be defined by particular policies.
Xuhui Ao, Naftaly H. Minsky
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Sex Roles and Street Roles

International Journal of the Addictions, 1976
A proposed typology of the street roles of female addicts was tested through interviews with 62 female addicts. Five role types are identified which are distinct from one another and exhaust the range of roles reported by respondents. A number of limitations to the typology are isolated and discussed.
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Dopamine's Role

Science, 1997
Ingrid Wickelgren's Special News Report “Getting the brain's attention” ([3 Oct., p. 35][1]) presents the views of those who question the current orthodoxy that dopamine acts in the nucleus accumbens as a key neurotransmitter underlying the behavioral effects of positive reinforcement or ...
Jeffrey A. Gray   +2 more
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The role of role models

BMJ, 2007
I come from a developing country where to leave or to stay is an omnipresent topic-from official debates to conversations in the corridors. As we approach graduation, this talk becomes more heated. Often the students who most seriously contemplate leaving the country and who also have the best chance are among the best and most ambitious graduates.
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