Risk-Adaptable Access Control (RAdAC) This paper considers the impediments of traditional access control approaches to sharing of. information. It describes a concept for an access control model that emulates real world decision-. making, considering operational need and security risk as part of each access control decision, and.
Turbulence can occur in the lowest part of the troposphere during the daytime when heating of the sun causes convective mixing of the air. Once the airplane rises above this turbulent boundary layer, the air becomes smoother. But other processes can also cause these up- and down-drafts.
In a final report released today, the National Transportation Safety Board said the probable cause of the crash was the loss of consciousness of two pilots caused by a loss in cabin pressure and a failure to get emergency oxygen. However, NTSB officials were unable to determine what caused the cabin pressure to drop.