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Displaying 49076 - 49100 of 74193

Lessons from 342 Medical Device Failures

November 17, 1999
Author(s)
D Wallace, David R. Kuhn
Today's highly complex systems often contain software. Lessons can be learned about softwaredevelopment and assurance concerning quality practices, from system failures activated bysoftware faults. This paper presents an analysis of failures of medical

On the Diffraction Limit for Lensless Imaging

November 17, 1999
Author(s)
Klaus Mielenz
The diffraction limit for lensless imaging, defined as the smallest obtainable point image, is analyzed and compared to the corresponding limit for imaging with lenses by means of theoretical considerations and numerical computations using the Fresnel

Status Report on the First Round of the Development of the Advanced Encryption Standard

November 17, 1999
Author(s)
James R. Nechvatal, Elaine B. Barker, Donna F. Dodson, Morris J. Dworkin, James Foti, E Roback
In 1997, the National Institute of Standards and Technology (NIST) initiated a process to select a symmetric-key encryption algorithm to be used to protect sensitive (unclassified) Federal Information, in furtherance of NIST's statutory responsibilities

Acquiring and Deploying Intrusion Detection Systems

November 16, 1999
Author(s)
Peter M. Mell
This ITL Bulletin provides basic information about intrusion detection systems (IDSs) to help organizations avoid common pitfalls in acquiring, deploying, and maintaining IDSs.

Using Chaos to Generate White Noise

November 15, 1999
Author(s)
Richard L. Kautz
Numerical simulations reveal that a phase-locked loop can be operated in a chaotic regime to generate a high level of noise which is approximately white over a broad frequency range. Heuristic arguments indicate that the low-frequency power spectrum may be

A Knowledge-Based Inspection Workstation

November 3, 1999
Author(s)
Elena R. Messina, John A. Horst, Thomas R. Kramer, Hui-Min Huang, Tsung-Ming Tsai, E Amatucci
We are building an inspection workstation development environment to use as a testbed for understanding what types of knowledge, e.g., data, algorithms, and processes, can increase the productivity of inspection operations. Inspection can be more efficient

The Engineering of Mind

November 2, 1999
Author(s)
James S. Albus
While the mind remains a mysterious and inaccessible phenomenon, many of the components of mind, such as perception, behavior generation, knowledge representation, value judgment, reason, intention, emotion, memory, imagination, recognition, learning

A General Quantitative Method to Validate Instrument Calibration Techniques

November 1, 1999
Author(s)
Steven D. Phillips
In this paper a method to validate proposed calibration procedures for coordinate measuring machines (CMMs) is presented. Conceptually, the validation procedure is based on a computer generated population of CMMs assumed to include any real CMM that a

Acoustic Evidence Against BCS Behavior in Monocrystal YBa 2 Cu 3 0 7

November 1, 1999
Author(s)
M Lei, Albert Migliori, H M. Ledbetter
Using a detwinned YBa 2Cu 30 7 monocrystal and acoustic-resonance spectroscopy, we measured internal friction Q- = A If through the 91-K superconducting-transition temperature. We show measurements for the first ten macroscopic resonance frequencies f r

An Information System to Support Calibration

November 1, 1999
Author(s)
Kevin G. Brady
The National Institute of Standards and Technology (NIST) performs calibrations that achieve the highest level of measurement quality for the makers and users of precision devices world-wide. The information system that administers these calibrations

Antenna-Coupled Niobium Bolometers for MM-Wave Imaging Arrays

November 1, 1999
Author(s)
Shalva Nolen, Jonathan A. Koch, Nicholas Paulter, Carl D. Reintsema, Erich N. Grossman
Antenna-coupled thin-film niobium microbolometers designed for mm-wave imaging arrays have been fabricated and their electrical properties measured. The niobium bolometers are operated at room temperature and are located at the feeds of half-wave dipole

Applicability of Metrology to Information Technology

November 1, 1999
Author(s)
M M. Gray
In 1959, the Director of the National Bureau of Standards declared The emergence of science and technology as the paramount concern of the Nation in the 20th century demanded the highest order of measurement competence, in order to provide the standards

Application of Laser Polarimetry to the Measurement of Specific Heat Capacity and Enthalpy of the Alloy 53Nb-47Ti (mass%) in the Temperature Range 1600 K to 2000 K by a Millisecond-Resolution Pulse Heating Technique

November 1, 1999
Author(s)
D Basak, Ursula R. Kattner, J L. McClure, Daniel Josell, A Cezairliyan
The determination of the specific heat capacity, enthalpy and electrical resistivity of the alloy, 53Nb-47Ti (mass%), in the temperature range 1600 K to 2000 K is described. The method is based on rapid resistive self-heating of a solid cylindrical

Arrayed DBR Waveguide Lasers for the ITU Grid

November 1, 1999
Author(s)
D. L. Veasey, David S. Funk, Gregory E. Obarski, M. A. Mccoy, M. P. Bendett, Joseph S. Hayden
Waveguide lasers fabricated in Yb/Er-codoped phosphate glass operating at wavelengths between 1520-1590 nm are promising low-cost laser sources for use in future DWDM Systems and in WDM component test beds.
Displaying 49076 - 49100 of 74193