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Displaying 40851 - 40875 of 74095

A Framework for Multi-mode Authentication: Overview and Implementation Guide

August 1, 2003
Author(s)
Wayne Jansen, Vladimir Korolev, Serban I. Gavrila, T Heute, Clement Seveillac
The use of mobile handheld devices within the workplace is expanding rapidly. These devices are no longer viewed as coveted gadgets for early technology adopters, but have instead become indispensable tools that offer competitive business advantages for

A Hybrid Approach To Manufacturing Enterprise Simulation

August 1, 2003
Author(s)
Luis C. Rabelo, M Helal, Albert T. Jones, J Min, Y J. Son, A S. Deshmukh
Manufacturing enterprise decisions can be classified into four groups: business decisions, design decisions, engineering decisions, and production decisions. Numerous physical and software simulation techniques have been used to evaluate specific decisions

A Link-Level Simulator of the CDMA2000 Reverse-Link Layer

August 1, 2003
Author(s)
Hamid Gharavi, R Wyatt-Millington, F Chin, K Ban
This paper presents the design and implementation of a simulation model for the cdma2000 reverse link. The model includes all the radio configurations and their corresponding data rates in accordance with the IS-2000 specifications. The paper first

A Link-Level Simulator of the cdma2000 Reverse-Link Physical Layer

August 1, 2003
Author(s)
Hamid Gharavi, F Chin, K Ban, R Wyatt-Millington
The cdma2000 system is an evolutionary enhancement of the IS-95 standards which support 3G services defined by the International Telecommunications Union(ITU). cdma2000 comes in two phases: 1XRTT and 3XRTT (1X and 3X indicatesthe number of 1.25 MHz wide

A Logical Model of Conceptual Integrity in Data Integration

August 1, 2003
Author(s)
David W. Flater
Conceptual integrity is required for the result of data integration to be cohesive and sensible. Compromised conceptual integrity results in semantic faults, which are commonly blamed for latent integration bugs. A logical model of conceptual integrity in

A Manufacturing B2B Interoperability Testbed

August 1, 2003
Author(s)
Nenad Ivezic, Boonserm Kulvatunyou, Albert T. Jones
This paper describes the NIST Manufacturing Business-to-Business Interoperability Testbed developed at the Manufacturing Systems Integration Division of the National Institute of Standards and Technology. The testbed is geared to advance state of practice

A Neutral Information Model for Simulating Machine Shop Operations

August 1, 2003
Author(s)
Yung-Tsun Lee, Charles R. McLean, Guodong Shao
Small machine shops typically do not have the resources to develop custom simulations of their operations or data translators to import their data from other manufacturing software applications. This paper presents an overview of an information model

A Semantic Web Service Framework to Intelligent Distributed Manufacturing

August 1, 2003
Author(s)
Boonserm Kulvatunyou, Hyunbo Cho, Y J. Son
As markets become unexpectedly turbulent with a shortened product life cycle and a power shift towards buyers, the need for methods to rapidly and cost-effectively develop products, production facilities and supporting software is becoming urgent. The use

Ab Initio Calculation of the KRb Dipole Moments

August 1, 2003
Author(s)
Svetlana A. Kotochigova, Paul S. Julienne, Eite Tiesinga
The relativistic configuration interaction valence bond method has been used to calculate permanent and transition electric dipole moments of the KRb heteronuclear molecule as a function of internuclear separation. The permanent dipole moment of the ground

Ab Initio Characterization of the Weakly Bound Anions ClOO- and ArCl-

August 1, 2003
Author(s)
Karl K. Irikura
Experimental studies of the energetics and vibrational spectrum of the chloroperoxyl radical, ClOO, are contradictory. The most recent experiment accessed the radical by photodetachment of the corresponding anion, ClOO -. The present study uses both multi-

Ac-dc Difference at Cryogenic Temperatures

August 1, 2003
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Carl D. Reintsema
We are continuing the development of a new primary standard for ac-dc difference that utilizes a superconducting resistive transition-edge device as the sensor. The most recent improvements to the Cryogenic Thermal Transfer Standard (CTTS) include on-chip

Angular Response Characteristics of Ellipsoidal Radiometers

August 1, 2003
Author(s)
A V. Murthy, D P. DeWitt, Gerald T. Fraser
This paper presents an experimental study of the angular response of an ellipsoidal radiometer performed using a 25 mm diameter variable temperature blackbody as a radiant source. The radiometer consists of a highly reflective ellipsoidal cavity with a

Atomistic Description of the Electronic Structure of T-Shaped Quantum Wires

August 1, 2003
Author(s)
Javier Aizpurua, G C. Bryant, W Jaskolski
We use an atomistic tight-binding theory to study arrays of T-shaped GaAs/AlGaAs quantum wires. An atomistic approach allows us to provide a theory of the electron and hole states in T-shaped wires without the approximations that limit the effective mass

Comparison of Concrete Rheometers.

August 1, 2003
Author(s)
Chiara F. Ferraris, L E. Brower
Concrete mixtures require sufficient workability for proper placement. In particular, sprayed, pumped and self-compacting concretes require careful definition and control of their flow properties to produce good workability. The American Concrete Institute

Comparison of Measured and Predicted Tracer Gas Concentrations in a Townhouse

August 1, 2003
Author(s)
Steven J. Emmerich, Steven J. Nabinger, A Gupte, Cynthia H. Reed, L A. Wallace
To further validate the use of the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF6), was manually injected within one room of the house and

Criteria for Water Closet Test Standard--A Survey

August 1, 2003
Author(s)
L S. Galowin, R Hill
Waste loads require test representations with artifacts for actual load which have not achieved researchers' consensus for wide recognition. Disparate practices exist throughout the world for test materials, quantity and load extraction acceptance criteria

Data Driven Design and Simulation System Based on XML

August 1, 2003
Author(s)
Guixiu Qiao, Frank H. Riddick, Charles R. McLean
Implementing a highly flexible manufacturing approach, like mass customization manufacturing, demands an integrated design and simulation system. This system must be able to cope with difficult issues such as a high level of product variety, uncertainty in

Design and Characterization of a Photometer/Colorimeter Standard

August 1, 2003
Author(s)
J Racz, George P. Eppeldauer
A photometer/tristimulus colorimeter has been developed at the National Institute of Standards and TEchnology (NIST) to realize a color scale. A novel construction was developed to implement the spectral responsivity based scale with small uncertainty. The
Displaying 40851 - 40875 of 74095
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