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Displaying 52201 - 52225 of 74191

A Revised Model for Role-Based Access Control

July 9, 1998
Author(s)
Wayne Jansen
Role Based Access Control (RBAC) refers to a class of security mechanisms that mediate access to resources through organizational identities called roles. A number of models have been published that formally describe the basic properties of RBAC. This

Moment-Preserving Modeling With Image Applications

July 6, 1998
Author(s)
Anastase Nakassis, Abdou S. Youssef
Linear least-square modeling is a powerful modeling approach. Optimal piece-wise constant modeling is an important special case. In this paper we will develop a piece-wise constant modeling method that preserves the regional means and regional first

450 Golden Gate Project: BACnet's(TM) First Large-Scale Test

July 1, 1998
Author(s)
M A. Applebaum, Steven T. Bushby
The Phillip Burton Federal Building and U.S. Courthouse located at 450 Golden Gate Avenue in San Francisco was selected as the site for the world's first large-scale commercial demonstration of the BACnet standard. BACnet is a standard communication

A framework for control architectures

July 1, 1998
Author(s)
M. K. Senehi, Thomas R. Kramer
The development of architectures for control systems has been an active area of research for at least twenty years. This research has produced many different architectures which use different terminologies and address different issues. In order to analyse

A Guarded Transfer Standard for High Resistance Measurements

July 1, 1998
Author(s)
Dean G. Jarrett
An improved design for a guarded transfer standard in the resistance range 1 M[Ω] to 100 G[Ω] is described. Existing transfer standards and limitations are reviewed. Interchangeable guard networks are used in the improved transfer standards to ensure

A New Technique for Determining Long-Term TDDB Acceleration Parameters of Thin Gate Oxides

July 1, 1998
Author(s)
Y Chen, John S. Suehle, Chien-Chung Shen, J B. Bernstein, C. Messick, P Chaparala
A new technique, the dual voltage versus time curve (V-t) integration technique, is presented as a much faster method to obtain time-dependent dielectric breakdown (TDDB) acceleration parameters ([alpha] and [tau]) of ultra-thin gate oxides compared to

A Reference Quality Equation of State for Nitrogen

July 1, 1998
Author(s)
R Span, Eric Lemmon, R. T. Jacobsen, Wolfgang Wagner
A new formulation describing the thermodynamic properties of nitrogen has been developed. New data sets are now available which have been used to improve the representation of the 0-0-T surface of gaseous, liquid and supercritical nitrogen, including the

A System to Measure Current Transducer Performance

July 1, 1998
Author(s)
Bryan C. Waltrip, Thomas L. Nelson
A special purpose ac current transducer measurement system capable of intercomparing transducers with ac output voltage ratios from 1:1 to 50:1 has been developed to extend the range and accuracy of current transformer, current shunt, and mutual inductor

An Accurate Measurement of Planck's Constant

July 1, 1998
Author(s)
Edwin R. Williams, Richard L. Steiner, David B. Newell
Using a moving coil watt balance, electric power measured in terms of the Josephson and quantum Hall effects is compared with mechanical power measured in terms of the meter, kilogram and second, we find the Planck constant h = 6.62606891(58) x 10 -34 Js

An Object-Oriented Representation for Product and Design Processes

July 1, 1998
Author(s)
Ram D. Sriram, S Gorti, A Gupta, Gerard Kim, A Wong
We report on the development of a knowledge representation model, which is based on the SHARED object model reported in [33,34]. Our current model is implemented as a layered scheme, that incorporates both an evolving artifact and its associated design
Displaying 52201 - 52225 of 74191
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