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Displaying 36601 - 36625 of 74045

mLab: A Mobile Ad Hoc Network Test Bed

July 14, 2005
Author(s)
Tom T. Karygiannis, Emmanouil Antonakakis
Over the last few years, research in the area of mobile ad hoc networks (MANETs) has focused on routing protocol performance improvements, security enhancements, power consumption optimizations, and quality of service metrics. The availability of

Knowledge Representation and Decision Making for Mobile Robots

July 13, 2005
Author(s)
Elena R. Messina, Stephen B. Balakirsky
Knowledge is central to a mobile robot's ability to carry out its missions and adapt to changes in the environment it is traversing. The knowledge subsystem must support acquisition of information from external sources, maintain prior knowledge, infer new

Toward an Improved Color Rendering Metric

July 13, 2005
Author(s)
Wendy L. Davis, Yoshihiro Ohno
Several aspects of the Color Rendering Index (CRI) are flawed, limiting its usefulness in assessing the color rendering capabilities of LEDs for general illumination. At NIST, we are developing recommendations to modify the CRI that would overcome these

Vapor pressures of n-heptane determined by comparative ebulliometry

July 13, 2005
Author(s)
Jesus Sanchez Ochoa, Michael B. Ewing
The vapor pressures of n-heptane have been measured using comparative ebulliometry with water as the reference substance. The measurements cover the temperature and pressure range 372 K and 102 kPa to 537 K and 2621 kPa and were correlated by a Wagner type

Electron Probe Microanalysis with Cryogenic Detectors

July 9, 2005
Author(s)
Dale E. Newbury, Kent D. Irwin, Gene C. Hilton, David A. Wollman, John A. Small, John M. Martinis
Electron probe x-ray microanalysis is based upon the use of a focused, high current density electron beam, 5 keV to 30 keV in energy, to excite characteristic x-rays from a picogram mass of a solid target. X-ray spectral measurements are currently

A New Technique for Evaluating Diffusion Mobility Parameters

July 7, 2005
Author(s)
Carelyn E. Campbell
The development and evaluation of a multicomponent diffusion mobility database for Ni-rich alloys are reviewed. In an effort to more directly evaluate the mobility parameters in the database, a method for optimizing the mobility parameters as a function of

CCQM-K27-Subsequent: Key Comparison (subsequent) for the Determination of Ethanol in Aqueous Matrix

July 7, 2005
Author(s)
Michele M. Schantz, David L. Duewer, Reenie M. Parris, Willie E. May, M Archer, C Mussell, D Carter, L A. Konopelko, Y A. Kustikov, A I. Krylov, O V. Fatina
Ethanol is important both forensically ('drunk driving' or driving while under the influence, 'DWI', regulations) and commercially (alcoholic beverages). Blood- and breath-alcohol testing can be imposed on individuals operating private vehicles such as

In-Situ Hardening Hydroxyapatite-Based Scaffold for Bone Repair

July 7, 2005
Author(s)
Yu Zhang, Hockin D. Xu, Shozo Takagi, Laurence C. Chow
Musculoskeletal conditions are becoming a major health concern because of an aging population and sports- and traffic-related injuries. While sintered hydroxyapatite implants require machining, calcium phosphate cement (CPC) bone repair material is

A comprehensive evaluation of an outdoor vehicular test range

July 4, 2005
Author(s)
Robert T. Johnk, David R. Novotny, Chriss A. Grosvenor, Seturnino Canales, Janalee A. Graham, Louis L. Nagy, Doug Martin, Scott Yencer, Donald Hibbard, Tyrone L. Roach
This paper summarizes a joint industry/govenment effort to eveluate a large outdoor automotive antenna test range owned by a large automotive manufacturer.

A Review of Building Evacuation Models

July 1, 2005
Author(s)
Erica D. Kuligowski, Richard D. Peacock
Evacuation calculations are increasingly becoming a part of performance-based analyses to assess the level of life safety provided in buildings. In some cases, engineers are using back-of-the-envelope (hand) calculation to assess life safety, and in others

A Review of Building Evacuation Models

July 1, 2005
Author(s)
Erica D. Kuligowski, Richard D. Peacock
Evacuation calculations are increasingly becoming a part of performance-based analyses to assess the level of life safety provided in buildings. In some cases, engineers are using back-of-the-envelope (hand) calculation to assess life safety, and in others

A Review of Current Research Work on BGP Security

July 1, 2005
Author(s)
Kotikalapudi Sriram
We examine the performance of multimodal biometric authentication systems using state-of-the-art Commercial Off-the-Shelf (COTS) fingerprint and face biometric systems on a population approaching 1,000 individuals. Majority of prior studies of multimodal

A Simulation Study of Repeatability and Bias in the CD-SEM

July 1, 2005
Author(s)
John S. Villarrubia, Andras Vladar, Michael T. Postek
Abstract: The ability of a critical dimension scanning electron microscope (CD-SEM) to resolve differences in the widths of two lines depends on the instrument?s measurement repeatability and any sample dependent biases. The dependence of repeatability and
Displaying 36601 - 36625 of 74045
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