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Displaying 53951 - 53975 of 74189

Role Based Access Control for the World Wide Web

October 10, 1997
Author(s)
John Barkley, Anthony V. Cincotta, David F. Ferraiolo, Serban I. Gavrila, David R. Kuhn
One of the most challenging problems in managing large networked systems is the complexity of security administration. This is particularly true for organizations that AWeb (WWW) servers. Today, security administration is costly and prone to error because

On the Fast Track: New Usability Testing Methods for Web Sites

October 2, 1997
Author(s)
Jean C. Scholtz, L L. Downey
The dynamic nature of the Web poses problems for usability evaluations. Development times are rapid, changes to Web sites occur frequently, often without reevaluating the usability of the entire site, and new advances in Web developments change user

The Critical Evaluation of Transition Probabilities of Na-Ca (Z=11 to 20)

October 2, 1997
Author(s)
Daniel E. Kelleher, Larissa Podobedova
We provide a progress report on the critical evaluation of transition probabilities for Na to Ca (Z-11-20), which are to replace the 30 year old NIST/AIP/ACS publication (Journal of Physical and Chemical Reference Data Monograph 7) on this material

A Decision Support System for Material and Manufacturing Process Selection

October 1, 1997
Author(s)
Ronald Giachetti
The material and manufacturing process selection problem is a multi-attribute decision making problem. These decisions are made during the preliminary design stages in an environment characterized by imprecise and uncertain requirements, parameters, and

A Unique Sensor Fusion System for Coordinate Measuring Machine Tasks

October 1, 1997
Author(s)
M Nashman, Billibon H. Yoshimi, Tsai H. Hong, William G. Rippey, Martin Herman
This paper describes a real-time hierarchical system that combines (fuses) data from vision and touch sensors to simplify and improve the operation of a coordinate measuring machine (CMM) used for dimensional inspection tasks. Our emphasis is on sensory

Accuracy of Resonant Ultrasound Spectroscopy: An Experimental Study

October 1, 1997
Author(s)
M C. Renken, Sudook A. Kim, K W. Hollman, C M. Fortunko
We use Resonant Ultrasound Spectroscopy (RUS) to routinely determine elasticstifftness coefficents. To establish the uncertaintly of RUS, we determined the longitudinal wave velocity in a cylinder (25.6 mm x 25.4 mm diam.) of fused silica using three

An Ultrasonic Measurement of Magnetostriction

October 1, 1997
Author(s)
B Igarashi, G A. Alers, P T. Purtscher
The amplitudes of shear horizontal plate waves generated by EMATs (electromagnetic acoustic transducers) are measured to obtain estimated of the magnetostriction of a steel specimen. The wave amplitude is linked to magnetrostriction through an existing

ATP Motor Vehicle Manufacturing Technology [MVMT] Public Workshop

October 1, 1997
Author(s)
J C. Boudreaux, T R. Lettieri
The ATP Motor Vehicle Manufacturing Technology [MVMT] program focuses on technology advances that strengthen manufacturing capabilities along the entire automotive production chain. Extensive, and continuing, contacts with industry have made it clear that

Chapter 6: Virtual Environments for Design and Manufacture

October 1, 1997
Author(s)
Kevin W. Lyons, Scott Angster, Sankar Jayaram
The technology of computer-aided design and computer aided manufacturing (CAD/CAM) has progressed significantly from the two-dimensional wireframe drafting systems of the 1970''s to the parametric and feature-based solid modelers of the 1990''s. There are

Cumulative Seismic Damage of Reinforced Concrete Bridge Piers

October 1, 1997
Author(s)
S K. Kunnath, A El-Bahy, A W. Taylor, William C. Stone
A comprehensive experimental study was undertaken in this research effort to investigate cumulative damage in reinforced concrete circular bridge piers. Twelve identical quarter-scale bridge columns, designed and fabricated in accordance with current
Displaying 53951 - 53975 of 74189
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