Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Conferences

Steering a Time Scale

December 1, 2008

Author(s)

Judah Levine

A time scale is a procedure for combining the data from an ensemble of clocks or frequency standards. The input data to the ensemble algorithm are generally the...

Locking a Rubidium Oscillator to a Remote Time Scale Using Real-Time Common-View GPS Measurements

December 1, 2008

Author(s)

Michael A. Lombardi, A.P. Dahlem

This paper introduces a new device, a prototype common-view disciplined oscillator (CVDO) that can be locked to a remote time scale through the use of real-time...

Vibration-induced PM Noise of A Rigid Optical Fiber Spool

December 1, 2008

Author(s)

Jennifer A. Taylor, Craig W. Nelson, Archita Hati, Neil Ashby, David A. Howe

Oscillators operating in field applications are subject to much more strenuous environmental effects than those in the laboratory. These environmental effects...

Progress on a portable rubidium fountain frequency standard

December 1, 2008

Author(s)

Paul D. Kunz, Thomas P. Heavner, Steven R. Jefferts

We are developing a simple and transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. The optical package for this system uses DFB...

Time and Frequency Transfer Activities at NIST

December 1, 2008

Author(s)

Victor S. Zhang, Michael A. Lombardi

The National Institute of Standards and Technology (NIST) maintains one of the world s most accurate and stable time scales, and also developed and maintains...

GPS Changes Before and After Implementation of the Architecture Evolution Plan

December 1, 2008

Author(s)

Marc A. Weiss

We characterize the performance of GPS signals before, and after Architecture Evolution Plan (AEP) implementation. We use the period from May 20 through...

PTTI Capabilities of the Modernized LORAN System

December 1, 2008

Author(s)

Kirk Montgomery, Michael A. Lombardi

This paper covers the current status and future plans of the modernized LORAN systems in North America, the European Union, Asia, & Saudi Arabia. Special focus...

Non-Coherent Amplify-and-Forward Generalized Likelihood Ratio Test Receiver

November 30, 2008

Author(s)

Michael R. Souryal

This paper proposes a simple non-coherent amplify-and-forward receiver for the relay channel and evaluates its diversity performance for Rayleigh fading...

A Secure VANET MAC Protocol for DSRC Applications

November 30, 2008

Author(s)

Yi Qian, Nader Moayeri, Kejie Lu

Vehicular ad hoc networking is an important component of Intelligent Transportation Systems. The main benefit of vehicular ad hoc network (VANET) communication...

A Novel Topology Control Scheme for Future Wireless Mesh Networks

November 30, 2008

Author(s)

Yi Qian, Kejie Lu, Tao Zhang, Shengli Fu

In this paper, we address the topology control issue for future wireless mesh networks (WMNs) based on the principle of service-oriented design. In particular...

Security Challenges in Seamless Mobility - How to ``Handover'' the Keys?

November 30, 2008

Author(s)

Katrin Hoeper, Lidong Chen, Antonio Izquierdo Manzanares, Nada T. Golmie

In this paper, we discuss key management challenges for seamless handovers across heterogeneous wireless networks. We focus on fast access authentication...

A New Protocol for Semi-Automatic Generation of Reference Data for High Resolution Biological Images

November 30, 2008

Author(s)

Adele P. Peskin, Joe Chalfoun, Alden A. Dima, James J. Filliben

We compare manually segmented masks of cell images that are independently hand-selected by several different people, with a new semi-automated method for...

Diversity Performance of a Practical Non-Coherent Detect-and-Forward Receiver

November 30, 2008

Author(s)

Michael R. Souryal, Huiqing You

We propose a non-coherent receiver for the fixed detect-and-forward relay channel and derive a closed-form tight upper bound on its bit error probability in...

Computational Parameters in Simulation of Microscope Images

November 28, 2008

Author(s)

Egon Marx, James E. Potzick

The simulation of microscope images computed from scattered fields determined using integral equations depend on a number of parameters that are not related to...

Integral Equations for 3-D Scattering: Finite Strip on a Substrate

November 28, 2008

Author(s)

Egon Marx

Singular integral equations that determine the exact fields scattered by a dielectric or conducting finite strip on a substrate are presented. The computation...

Managing Materials Information in the Supply Chain

November 28, 2008

Author(s)

John V. Messina, Eric D. Simmon

One important aspect of sustainable manufacturing is the acquisition and management of product material information. This information may be used to improve the...

Instrumented Indentation for Quantifying Quasi-static and Transient Properties of Polymeric Coatings

November 26, 2008

Author(s)

Aaron M. Forster, Peter Krommenhoek, Li Piin Sung, Chris A. Michaels, Kurt Wood

Instrumented indentation was used to investigate the mechanical properties of coatings for automotive and architectural applications. First, the mechanical...

Boundary Slip Effects on the Linear Stability of Circular and Spiral Poiseuille Flow

November 25, 2008

Author(s)

Geoffrey B. McFadden, David L. Cotrell

In this work, we consider the effect of boundary slip on the linear stability of various internal flows having boundary curvature. For the case of annular flow...

Nathan D. Lemke, Andrew Ludlow, Zeb Barber, N Poli, C.W. Hoyt, Long-Sheng Ma, Jason Stalnaker, Christopher W. Oates, Leo Hollberg, James C. Bergquist, A. Brusch, Tara Fortier, Scott Diddams, Thomas P. Heavner, Steven R. Jefferts, Tom Parker

We describe the development and latest results of an optical lattice clock based on neutral Yb atoms, including investigations based on both even and odd...

Using the EAP Framework for Fast Media Independent Handover Authentication

November 17, 2008

Author(s)

Antonio Izquierdo Manzanares, Nada T. Golmie, Katrin Hoeper, Lidong Chen

In this paper we compare different authentication techniques that may be used in order to reduce the time and resources required to perform a handover, namely...

Performance Evaluation of a Secure Mac Protocol for Vehicular Networks

November 17, 2008

Author(s)

Yi Qian, Kejie Lu, Nader Moayeri

The main benefit of vehicular communication is seen in active safety systems that increase passenger safety by exchanging warning messages between vehicles...

Call Admission Control for Mobile Agent Based Handoff in Wireless Mesh Networks

November 17, 2008

Author(s)

Yi Qian, Bo Rong, Kejie Lu, Michel Kadoch

Wireless mesh network (WMN) has emerged recently as a promising technology for next-generation wireless networking. In WMN, it is important to provide an...

Performance of A Novel Topology Control Scheme for Future Wireless Mesh Networks

November 17, 2008

Author(s)

Yi Qian, Kejie Lu, Tao Zhang, Shengli Fu, Ayat Jafari

In this paper, we address the topology control issues for future wireless mesh networks (WMNs). In particular, we propose a novel topology control scheme that...

Predictive Handover Mechanism based on Required Time Estimation in Heterogeneous Wireless Networks

November 17, 2008

Author(s)

Sang J. Yoo, David E. Cypher, Nada T. Golmie

In most conventional layer 2 triggering approaches, a pre-defined threshold for a specific perspective such as the received signal strength is used. This may...

Near-Field Spherical Scanning: Uncertainties in Test-Zone Field Measurements

November 16, 2008

Author(s)

Randy Direen, Ronald C. Wittmann, Michael H. Francis

The electromagnetic field within a test volume can be measured using spherical scanning techniques. Characterization of the field within the sphere requires...

HF Proximity RFID Electromagnetic Emissions and Performance

November 16, 2008

Author(s)

Jeffrey R. Guerrieri, David R. Novotny, Catherine A. Remley, Michael H. Francis

We examined the emissions, and performance of commercial High-Frequency Radio Frequency Identification (HF RFID) systems to interrupt and eavesdropping. These...

Polarimetric calibration of indoor and outdoor polarimetric radar cross section systems

November 16, 2008

Author(s)

Lorant A. Muth

We use a set of dihedrals to perform polarimetric calibrations on an indoor RCS measurement range. We obtain simultaneously hh, hv, vh, and vv polarimetric data...

Access Control Policy Composition for Resource Federation Networks Using Semantic Web and Resource Description Framework (RDF)

November 13, 2008

Author(s)

Chung Tong Hu, Stephen Quirolgico, Karen A. Scarfone

The availability of global, pervasive information relies on seamless access to federated resources through sharing and trust between the participating members...

USE OF COMBUSTION EFFLUENT DATA IN TENABILITY ASSESSMENT

November 11, 2008

Author(s)

Richard G. Gann

Typical prescriptive and performance-based assessments of life safety in building fires do not explicitly consider the contributions of the toxic potency of...

Fire Effluent, People, and Standards: Standardization Philosophy for the Effects of Fire Effluent on Human Tenability ON HUMAN TENABILITY

November 11, 2008

Author(s)

Richard G. Gann

It has been known for decades that people die from inhaling fire gases and that visible smoke presents challenges to people trying to escape from fires in homes...

Was this page helpful?