Steven J. Henkind

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A number of security models including the military model, the Institute of Medicine model, and the matrix model have been utilized, or proposed, for protecting clinical information systems. These models have a number of limitations, however, and of particular concern, they focus on security as opposed to access. In this paper we describe a multilevel access(More)
There has been a considerable amount of work on uncertainty in knowledge-based systems. This work has generally been concerned with uncertainty arising from the strength of inferences and the weight of evidence. In this paper we discuss another type of uncertainty: that which is due to imprecision in the underlying primitives used to represent the knowledge(More)