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Conferences

Supporting Relationships in Access Control Using Role Based Access Control

October 29, 1999

Author(s)

John Barkley, Konstantin Benznosov, Jinny Uppal

The Role Based Access Control (RBAC) model and mechanism have proven to be useful and effective. This is clear from the many RBAC implementations in commercial...

TREC-6 1997 Spoken Document Retrieval Track Overview and Results

October 25, 1999

Author(s)

John S. Garofolo, Ellen M. Voorhees, Vincent M. Stanford, K Sparck Jones

This paper describes the 1997 TREC-6 Spoken Document Retrieval (SDR) Track which implemented a first evaluation of retrieval of broadcast news excerpts using a...

Characteristic impedance of microstrip on silicon

October 25, 1999

Author(s)

Dylan F. Williams, Bradley K. Alpert

In this paper, we compare the power-voltage, power-current, and causal definitions of the characteristic impedance of microstrip transmission lines on silicon...

Characteristic Impedance of Microstrip on Silicon

October 25, 1999

Author(s)

Dylan F. Williams, Bradley K. Alpert

We compare power-voltage, power-current, and causal definitions of the characteristic impedance of microstrip transmission lines on silicon substrates.

Polymer Layered-Silicate Nanocomposites: Polyamide-6, Polypropylene and Polystyrene

October 24, 1999

Author(s)

Jeffrey W. Gilman, A B. Morgan, Richard H. Harris Jr., E Manias, E P. Giannelis, M Wuthenow

In many of the cases studied, polymer-clay nanocomposites are materials that have improved thermal properties. Furthermore, most of the nanocomposite systems...

Towards a Measurement Technique for Risk Management

October 20, 1999

Author(s)

D G. Marks

The field of computer security is impeded by a lack of objective, quantitative measures. As a result, most systems, whether theoretical or actual, attempt to...

Statistical Testing of Random Number Generators

October 19, 1999

Author(s)

D L. Banks

Random Number Generators (RNGs) are an important building block for algorithms and protocols in cryptography. They are paramount in the construction of...

Status of the Advanced Encryption Standard (AES) Development Effort

October 19, 1999

Author(s)

James Foti

The purpose of this presentation will be to articulate the status of NIST=s Advanced Encryption Standard (AES) development effort. This presentation will...

Calibration Particles Relevant to the Measurement of Nanosize Particles.

October 11, 1999

Author(s)

George W. Mulholland

The development of technologies associated with nanometer size particles, such as automated wafer inspection systems, requires several monosize calibration...

Benchmark Database for Input and Validation of Multiphase Combustion Models.

October 11, 1999

Author(s)

J F. Widmann, S R. Charagundla, Cary Presser

Control of process efficiency and the formation of species byproducts from industrial thermal oxidation systems (e.g., power generation and treatment of liquid...

Flame Inhibition by Ferrocene, Carbon Dioxide, and Trifluoromethane Blends: Synergistic and Antagonistic Effects

October 11, 1999

Author(s)

Gregory T. Linteris, M D. Rumminger

The production of CF3Br has been banned. As a flame inhibitor, iron pentacarbonyl (Fe(CO)5) is about two orders of magnitude more efficient than CF3Br, but it...

Investigation of Extinguishment by Thermal Agents Using Detailed Chemical Kinetic Modeling of Opposed-Flow Diffusion Flames

October 10, 1999

Author(s)

William M. Pitts, L G. Blevins

The manufacture of halons, which are widely used in fire extinguishing systems, was banned in 1984. The search for effective alternatives continues with a large...

Switching Characteristics of NPT- and PT-IGBTs Under Zero-Voltage Switching Conditions

October 5, 1999

Author(s)

B M. Song, Huibin Zhu, Jih-Sheng Lai, Allen R. Hefner Jr.

In this paper, switching characteristics of non-punch through (NPT) and punch through (PT) Insulated Gate Bipolar Transistors (IGBTs) are evaluated under zero...

Combustion Models for Wooden Brands.

October 4, 1999

Author(s)

J P. Woycheese, P J. Pagni

Eight combustion models for burning brands are reviewed. An averaged stagnation-point burning model, using the chemical properties of wood, is used here...

Modeling Based Examination of Conducted EMI Emissions from Hard- and Soft-Switching PWM Inverters

October 3, 1999

Author(s)

Huibin Zhu, Jih-Sheng Lai, Yi-hua D. Tang, Allen R. Hefner Jr., Celia Chen

For the purpose of investigation of electromagnetic interference (EMI) mechanisms in hard- and soft-switching PWM inverters, empirical models and comparative...

Characteristics and Utilization of a New Class of Low On-Resistance MOS-Gated Power Device

October 3, 1999

Author(s)

Jih-Sheng Lai, David W. Berning, Allen R. Hefner Jr., Chien-Chung Shen, B M. Song, R Zhou

A new class of MOS-gated power semiconductor devices Cool MOS has recently been introduced with a supreme conducting characteristic that overcomes the high on...

Representation of the RCS Reference Model Architecture Using An Architectural Description Language

October 2, 1999

Author(s)

Elena R. Messina, Christopher E. Dabrowski, Hui-Min Huang, John A. Horst

Software Engineering, Robotics & Intelligent Systems, Miscellaneous

Colorimetric Accuracies and Concerns in Spectroradiometry of LEDs

October 2, 1999

Author(s)

C Jones, Yoshi Ohno

LEDs are narrow-band emission sources and present special problems in colorimetric characterization. Chromaticity space is mapped using Gaussian spectral models...

Air-Java: Networking for Smart Spaces

October 1, 1999

Author(s)

Kevin L. Mills

Increasingly people work and live on the move. To support this mobile lifestyle, especially as work becomes more intensely information-based, companies are...

Pore Scale Modeling of Fluid Transport Using Lattice Boltzmann Methods

October 1, 1999

Author(s)

Nicos Martys, John G. Hagedorn, J E. Devaney

The utility of the lattice Boltzmann method for modeling fluid flow in complex geometries like porous materials is examined. After study of some simple test...

Radar Cross Section Calibration Errors and Uncertainties

October 1, 1999

Author(s)

Lorant A. Muth

To develop standards for radar cross section measurements a complete uncertainty analysis is needed.

Concealment and Obstacle Detection for Autonomous Driving

October 1, 1999

Author(s)

Tommy Chang, Tsai Hong Hong, Steven Legowik, Marilyn N. Abrams

Obstacle detection and mapping are essential for unmanned autonomous driving. This paper describes both the sensors and the supporting software used in our...

Monte Carlo Simulation of Reverberation Chamber

October 1, 1999

Author(s)

John M. Ladbury

This paper describes how to simulate a reverberation chamber using a uniform random number generator and mathematical manipulation.

Shaping of Filamentary Streamers by the Ambient Field

October 1, 1999

Author(s)

H A. Fowler, J E. Devaney, John G. Hagedorn

We have simulated the fast streamer stage of liquid dielectric breakdown as stochastic growth of a branching fractal tree. Breakdown and threshold properties of...

Anisotropic Small-Angle Neutron Scattering Studies of Ceramics

October 1, 1999

Author(s)

Andrew J. Allen, Lin-Sien H. Lum, K T. Faber, M H. Zimmerman, Jay S. Wallace

This paper discusses how small-angle neutron scattering studies can be applied in two variations to obtain a representative characterization of the large...

The Effect of Thermal Shock on the Thermal Conductivity of a Functionally Graded Material

October 1, 1999

Author(s)

Andrew J. Slifka, M Packer, A Kumakawa, Bernard J. Filla, J M. Phelps, N Shimoda

We have measured the thermal conductivity of a ni20Cr / 8% yttria-partially-stabilized-zirconia functionally graded 1.1 mm thick coating on a substrate of 403...

Stabilizing and Measuring Optical Frequencies

October 1, 1999

Author(s)

John L. Hall, M S. Taubman, Scott A. Diddams, B Tiemann, Jun Ye, L -. Ma, D J. Jones, Steven T. Cundiff

Many factors are coming together to make this an exciting time in the development of optical frequency standards. These include improved strategies for...

Studies of Hydration and Drying in Cement Pastes by Scanning X-Ray Absorptiometry

October 1, 1999

Author(s)

K K. Hansen, Dale P. Bentz

Hydration and drying in cement pastes are studied by the x-ray environmental chamber at DTU. By using the x-ray detector to detect changes in internal density...

An Improved Wide Band Antenna Test Cell: The Co-Conical Field Generation System

October 1, 1999

Author(s)

David R. Novotny, Robert T. Johnk, Arthur Ondrejka

We introduce a prototype test cell for generating wide-band standard fields suitable for antenna and immunity testing.

Antenna Gain Measurements at the National Institute of Standards and Technology: The Three-Antenna Extrapolation Method

October 1, 1999

Author(s)

Katherine MacReynolds, Michael H. Francis

This paper describes the extrapolation measurement method for determining gain of directive antennas at quasi-near-field distances.

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