John F. Koegel

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Several years have passed since penetration studies of operating systems were reported in the literature [1,2,3]. The intervening time has permitted the results of these studies Lo be incorporated into commercial products. Advances have also been made in related areas of computer architecture and layered software design that have led to computer system(More)
The prevailing vision for next generation multimedia communication systems is a digital one. However, we anticipate a transitional period in which hybrid networks involving both analog and digital technology will coexist. These analog facilities will include crossbar audio-video switches, CATV distribution systems, and dedicated lines. For some scale of(More)
Various multimedia authoring environments have been developed, resulting in a variety of approaches as to how such presentations are structured and authored. Implicit in these systems is a data model for composing multimedia objects and a user interface model for the authoring activity. Making these models explicit is one goal of this work, since we think(More)
A novel desi n for a secure distributed system is described and evaluated. A capabi ity based computer architecture is combined with crypto3. graphic network security techniques to protect global objects and preserve access rights across system boundaries. The resulting architecture is evaluated against several criteria, including the DOD Computer System(More)