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Displaying 5401 - 5425 of 7113

Capacitance and Dissipation Factor Measurements from 1 kHz to 10 MHz

July 1, 1998
Author(s)
Andrew D. Koffman, Bryan C. Waltrip, Nile M. Oldham, S. Avramov
A measurement technique developed by K. Yokoi et al. At Hewlett-Packard Japan, Ltd. Has been duplicated and evaluated at NIST to characterize four-terminal pair capacitors. The technique is based on an accurate three-terminal measurement made at 1 kHz

Workspace Variation of a Hexapod Machine Tool

March 1, 1998
Author(s)
J Conti, C Clinton, Li Zhang, Albert J. Wavering
A method is presented to evaluate the workspace variation of a Stewart platform based machine tool. Three sets of constraints, covering strut lengths, platform and base spherical joint angles, and strut collisions, are formulated using inverse kinematics

High-Accuracy Critical-Dimension Metrology Using a Scanning Electron Microscope

May 1, 1996
Author(s)
J R. Lowney, Andras Vladar, Michael T. Postek
Two Monte Carlo computer codes have been written to simulate the transmitted-, backscattered-, and secondary-electron signals from targets in a scanning electron microscope. The first discussed, MONSEL-II, is applied to semi-infinite lines produced

Airflow and Radon Transport Modeling in Four Large Buildings

January 1, 1995
Author(s)
Jin B. Fang, Andrew K. Persily
Computer simulations of multizone airflow and contaminant transport were performed in four large buildings using the program CONTAM88. This paper describes the physical characteristics of the buildings and their idealizations as multizone building airflow

Temperature-Dependent Yourn's Modulus of an SIC w /Al 2 O 3 Composite

March 1, 1994
Author(s)
M Weller, H M. Ledbetter
Using a computer-controlled resonant-bar apparatus at frequencies near 5 kHz, we determined the temperature-dependent (86-732 K) Young's modulus of a ceramic-ceramic composite with a 0.30 volume fraction of SiC whiskers in an Al 2O 3 matrix. Using a

CFAST: The Consolidated Model of Fire Growth and Smoke Transport.

February 1, 1993
Author(s)
Richard D. Peacock, Glenn P. Forney, Paul A. Reneke, Walter W. Jones, R W. Portier
CFAST is a zone model capable of predicting the environment in a multi-compartment structure subjected to a fire. It calculates the time evolving distribution of smoke and fire gases and the temperature throughout a building during a user-specified fire

AI in Manufacturing: The NBS AMRF as an Intelligent Machine

January 2, 1990
Author(s)
Dennis A. Swyt
Within its Automated Manufacturing Research Facility (AMRF), the U.S. National Bureau of Standards (NBS) is addressing research issues in interface standards for the fully automated factory of the future for the production of small batches of discrete

Distributed Data Interfaces--the Lessons of IMDAS

July 1, 1988
Author(s)
Edward J. Barkmeyer Jr.
In most industrial facilities, existing control, engineering and administrative systems operate on computer systems from many different manufacturers and use many different data systems. They have existing independently designed, and therefore overlapping

Process Planning for a Milling Machine From a Feature-Based Design

April 1, 1988
Author(s)
Thomas R. Kramer
In the Vertical Workstation (VWS) of the NBS Automated Manufacturing Research Facility, metal parts are machined automatically from a feature-based design. A simple two-and-a- half dimensional part may be designed and machined within an hour, allowing half

Research Issues in Process Planning at the National Bureau of Standards

October 1, 1987
Author(s)
Peter Brown, Steven R. Ray
Several years ago, the Automated Manufacturing Research Facility (AMRF) project was established at the Gaithersburg site of the National Bureau of Standards (NBS). This facility is unique in several ways: first, all manufacturing activities are under

Open-Source Excel Tools For Statistical Metrology

Author(s)
Hung-Kung Liu, William F. Guthrie, Juan Soto
In this paper we introduce an approach to construct statistical metrology tools with a Microsoft Excel based interface that use the open source statistical package R as the computational engine. These metrology tools will enable Excel users to access a

A Data Collection Platform for Network Management

April 2, 2024
Author(s)
Amar Abane, Abdella Battou, Abderrahim Amlou, Tao Zhang
Network management relies on extensive monitoring of network state to analyze network behavior, design optimizations, plan upgrades, and conduct troubleshooting. Network monitoring collects various data from network devices through different protocols and

Automated Network Programmability Using OpenConfig YANG Models and NETCONF Protocol

April 2, 2024
Author(s)
Abderrahim Amlou, Amar Abane, Mheni Merzouki, Lydia Ait Oucheggou, Zineb Maasaoui, Abdella Battou
This paper introduces a microservice-based architecture designed to enable automation of network programmability and management. Amid the complexity of today's networks and the diversity of equipment, achieving efficient and reliable network

Network Security Traffic Analysis Platform - Design and Validation

January 20, 2023
Author(s)
Zineb Maasaoui, Anfal Hathah, Hasnae Bilil, Van Sy Mai, Abdella Battou, ahmed lbath, Veton KEPUSKA
Real-time traffic management and control have become necessary in today's networks due to their complexity and cybersecurity risks. With the increase in internet use, threats are more present and require real-time detection and analysis to prevent

Seven-DOF Cable-Suspended Robot with Independent Metrology

October 4, 2004
Author(s)
R L. Williams, B Snyder, James S. Albus, Roger V. Bostelman
This paper presents a new cable-suspended robot. It is a 7-cable spatial design with a closed-form forward pose kinematics solution. Applications include automated machining, construction, and sculpting. This paper presents two new ideas. First, an

Selection of Calibration Particles for Scanning Surface Inspection Systems

August 8, 1996
Author(s)
George W. Mulholland, Nelson P. Bryner, Walter S. Liggett Jr, B W. Scheer, R. K. Goodall
In response to the semiconductor industry's need for both smaller calibration particles and more accurately sized larger particles, a joint SEMATECH, National Institute of Standards and Technology, and VLSI Standards, Inc. project was initiated to
Displaying 5401 - 5425 of 7113
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