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Search Publications

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Displaying 29301 - 29325 of 73829

Using Reverberation Chambers to Determine the Shielding Effectiveness of Physically Small, Electrically Large Enclosures/Cavities

November 20, 2008
Author(s)
Christopher L. Holloway, David A. Hill, Marco Sandroni, John M. Ladbury, Jason B. Coder, Galen H. Koepke, Andrew C. Marvin
With the proliferation of small electric devices in recent years, along with various other applications, there is a growing need to test and determine the shielding properties or shielding effectiveness (SE) of physically small (but electrically large)

Raman Spectroscopic Determination of Electron Concentration in n-Type GaSb

November 19, 2008
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang
Phonon-plasmon coupled mode Raman spectra of n-type GaSb were measured at room temperature as a function of electron concentration. These spectra were obtained using an optical system based on 752.55 nm excitation. Utilization of this wavelength permits

Building Networks and Public Safety Communications

November 18, 2008
Author(s)
David G. Holmberg, Stephen J. Treado, William D. Davis, Steven T. Bushby, Alan B. Vinh, Michael A. Galler, R Vettori
The Building Networks and Public Safety Communications project has three components: (1) addressing feasibility of using building networks for bridging first responder radio communications into buildings, (2) recommending changes to the SAFECOM Statement

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 efficient handoff scheme, due to the frequent user mobility. To address this issue, we propose a

Disordered Nanoparticle Interfaces for Defect-Tolerant Self-Assembly

November 17, 2008
Author(s)
Kevin G. Yager, Brian Berry, Kirt A. Page, Derek L. Patton, Alamgir Karim, Eric J. Amis
Self-assembly is a promising route for controlling the nanoscale structure and material properties of coatings, yet it remains difficult to control the microstructure of these systems. In particular, self-assembling materials typically have complex and

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. Other applications and private services are also permitted in order to lower the cost and to

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 attempts to maximize the overall throughput in the network and that takes into account traffic

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, re-authentication and pre-authentication. We provide a detailed analysis of each mechanism, and

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 proximity RFID systems are used in an increasing number of financial, identification, and access

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 compensation for probe-pattern effects. We provide a simple uncertainty analysis to estimate

Beta-Sheet Formation and RGD-Presentation Effects on Osteoblast Differentiation

November 15, 2008
Author(s)
Carl G. Simon Jr., Matthew Becker, Sheng Lin-Gibson, Kristen E. Roskov, David L. Kaplan, Abby W. Morgan
This report highlights our recent investigation into -sheet formation and RGD epitope presentation on the surface of blended silk films.1 Surface characterization of biomaterials for tissue engineering applications is of great importance to understand how

Cancellation of Vibration-Induced Phase Noise in Optical Fibers

November 15, 2008
Author(s)
Archita Hati, Craig W. Nelson, Jennifer A. Taylor, David A. Howe
Vibration causes mechanical distortions in fiber-optic transmission lines that induce phase fluctuations. A scheme is described which enables electronic cancellation of vibration-induced phase noise in an optical fiber wound on a spool. We report 20 dB or

Preparation and Characterization of Patchy Particles

November 14, 2008
Author(s)
Thuy Chastek, Steven D. Hudson, Vincent A. Hackley
The self-assembled organization of partilces depends on the symmetry of their interactions, and strides are being made in producing nanoaparticles of controlled shape and functionalization. This paper describes the use of particles adsorption to control

Unusual Heavy-mass Nearly Ferromagnetic State with a Surprisingly Large Wilson Ratio in Double Layered Ruthenates (Sr 1-x Ca x ) 3 Ru 2 O 7

November 14, 2008
Author(s)
Z Qu, L Spinu, H Q. Yuan, V Dobrosavljevic, Wei Bao, Jeffrey Lynn, M Nicklas, J Peng, T J. Liu, F Fobes, E Flesch, Z Q. Mao
We report a very unusual heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio Rw (e.g., Rw 700 for x = 0.2) in double layered ruthenates (Sr 1- xCa x) 3Ru 2O 7. This state does not evolve into a long-range ferromagnetic order

Timely Effective Handover Mechanism in Heterogeneous Wireless Networks

November 13, 2008
Author(s)
Sang J. Yoo, David E. Cypher, Nada T. Golmie
Next-generation wireless networks should be able to coordinate and integrate different communication systems. It has been a challenging problem to support a seamless handover in these diverse wireless network environments. Link level triggers can provide

Recommendation for Key Derivation Using Pseudorandom Functions

November 12, 2008
Author(s)
Lidong Chen
This Recommendation specifies techniques for the derivation of additional keying material from a secret key, either established through a key establishment scheme or shared through some other manner, using pseudorandom functions.

A Low Cost Fiducial Reference for Computed Tomography

November 11, 2008
Author(s)
Zachary H. Levine, Steven Grantham, Daniel S. Sawyer, Anthony P. Reeves, David F. Yankelevitz
Rationale and Objectives. To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in lesion size
Displaying 29301 - 29325 of 73829
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