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Displaying 54101 - 54125 of 74348

Uncertainty and Dimensional Calibrations

November 1, 1997
Author(s)
Theodore D. Doiron, John R. Stoup
The calculation of uncertainty for a measurement is an effort to set reasonable bounds for the measurement result according to standardized rules. Since every measurement produces only an estimate of the answer, the primary requisite of an uncertainty

Concrete Mixture Optimization Using Statistical Mixture Design Methods.

October 22, 1997
Author(s)
E S. Lagergren, Kenneth A. Snyder, M J. Simon
The optimization of mixture proportions for high-performance concretes, which contain many constituents and are often subject to several performance constraints, can be a difficult and time-consuming task. Statistical experiment design and analysis methods

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
Displaying 54101 - 54125 of 74348
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