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Displaying 53401 - 53425 of 73697

Comparing Simple Role Based Access Control Models and Access Control Lists

November 7, 1997
Author(s)
John Barkley
The RBAC metaphor is powerful in its ability to express access control policy in terms of the way in which administrators view organizations. The functionality of simple Role Based Access Control (RBAC) models are compared to access control lists (ACL). A

Specifying and Managing Role-Based Access Control Within a Corporate Intranet

November 7, 1997
Author(s)
David F. Ferraiolo, John Barkley
In order for intranets to reach their full potential, access control and authorization management mechanisms must be in place that can regulate user access to information in a manner that is consistent with the current set of laws, regulations, and

Tool Wear Mechanism in Continuous Cutting of Hardened Tool Steels

November 4, 1997
Author(s)
Y K. Chou, Christopher J. Evans
Precision hard turning provides an alternative to grinding in some finishing applications. Rapid tool wear, however, remains an impediment to the process being economically viable. This experimental study investigates microstructural aspects of cubic boron

Application of Transmission Electron Detection to SCALPEL Mask Metrology

November 1, 1997
Author(s)
R Farrow, Michael T. Postek, William J. Keery, Samuel N. Jones, J R. Lowney, M Blakey, L Fetter, J Griffith, J E. Liddle, L C. Hopkins, H A. Huggins, M Peabody, A Novembre
Linewidth measurements were performed on a 4X scattering with angular limitation in projection electron lithography (SCALPEL) e-beam lithography mask using the transmitted electron signal in a modified scanning electron microscope. Features as small as 0

Application of Trasmission Electron Detection to Scalpel Mask Metrology

November 1, 1997
Author(s)
R Farrow, Michael T. Postek, William J. Keery, Samuel N. Jones, J R. Lowney, M Blakey, L Fetter, A Liddle, L C. Hopkins, H A. Huggins, M Peabody, A Novembre, J Griffith
Linewidth measurements were performed on a 4X scattering with angular limitation in projection electron lithography (SCALPEL) e-beam lithography mask using the transmitted electron signal in a modified scanning electron microscope. Features as small as 0

Applications of the Rapidly Renewable Lap

November 1, 1997
Author(s)
R E. Parks, E Robert, Christopher J. Evans, David J. Roderick, J David, John A. Dagata
The rapidly renewable lap is based on the simple concept of generating the figure needed in a lap substrate and then replicating it into a thin film slumped over the substrate. Based on this concept, we describe how efficient laps can be constructed for

Data Structures for the Fire Data Management System, FDMS 2.0 (NISTIR 6088)

November 1, 1997
Author(s)
Rebecca W. Portier, Richard Peacock, Paul A. Reneke
Fire Data Management System, FDMS, is a design for a computer database to store and retrieve fire test results obtained from bench-scale and real-scale tests as well as fire simulation programs. By storing available fire test values in a common format

Development of a Message Model to Support Integrated Design and Manufacturing

November 1, 1997
Author(s)
Venkat Allada, Shaw C. Feng, Steven R. Ray
Mere data sharing between engineering design systems and manufacturing systems does not represent an ideal integrated system. While data sharing represents an important aspect of an integrated design and manufacturing environment, an equally critical

Digital Recording and Analysis of Positive Partial Discharges in Air

November 1, 1997
Author(s)
Yicheng Wang, X. Han, Richard J. Van Brunt, J. C. Horwath, D. L. Schweickart
A new Surface-mediated burst mode of partial discharges is discovered in which a partial discharge pulse has a fixed probability to induce a following pulse, forming a burst of evenly separated pulses. The probability is determined for several gap voltages
Displaying 53401 - 53425 of 73697
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