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The accompanying diagram is a general hierarchical model which shows functional manufacturing levels using computerised control of an industrial control system. Referring to the diagram; Level 0 contains the field devices such as flow and temperature sensors, and final control elements, such as control valves
Hierarchy of hazard control is a system used in industry to prioritize possible interventions to minimize or eliminate exposure to hazards. [ a ] It is a widely accepted system promoted by numerous safety organizations.
The hierarchy is traditionally depicted as a vertical listing of hazard control and exposure control options in descending order of priority, beginning at the top with elimination of the hazard as the most effective control, followed by substitution of a less hazardous option, followed by engineering controls to prevent exposures, followed by ...
PERA Reference model: Decision-making and control hierarchy, 1992. Purdue Enterprise Reference Architecture (PERA), or the Purdue model, is a 1990s reference model for enterprise architecture, developed by Theodore J. Williams and members of the Industry-Purdue University Consortium for Computer Integrated Manufacturing.
ICS basic organization chart (ICS-100 level depicted) The Incident Command System (ICS) is a standardized approach to the command, control, and coordination of emergency response providing a common hierarchy within which responders from multiple agencies can be effective.
In object oriented programming terms, the tree role hierarchy is single inheritance, while the partial hierarchy allows multiple. [1] When treated as a partial order, the role hierarchy example given above could be extended to a role such as ‘branch manager’ to inherit all permissions of ‘savings manager’, ‘loan manager’, and ...
With the concepts of role hierarchy and constraints, one can control RBAC to create or simulate lattice-based access control (LBAC). Thus RBAC can be considered to be a superset of LBAC. When defining an RBAC model, the following conventions are useful: S = Subject = A person or automated agent
Perceptual control theory (PCT) is a model of behavior based on the properties of negative feedback control loops. A control loop maintains a sensed variable at or near a reference value by means of the effects of its outputs upon that variable, as mediated by physical properties of the environment.