Now showing items 883-902 of 1934

(1972)
• #### Investigations in improving image visualization and quality in positron emission tomography/computed tomography (PET/CT) imaging ﻿

(2010)
Positron Emission Tomography/Computed Tomography (PET/CT) is a widely used imaging modality for managing patients with cancer. The combination of PET and CT can provide both functional and anatomic information of disease ...
• #### IO-lite: A copy-free UNIX I/O system ﻿

(1997)
Memory copy speed is known to be a significant barrier to high-speed communication. We perform an analysis of the requirements for a copy-free buffer system, develop an implementation-independent applications programming ...
• #### Ionization of Rydberg atoms by half-cycle pulses: Effect of pulse shape and rise time ﻿

(1998)
The ionization of potassium np Rydberg atoms with $n\sim388$ by pulsed unidirectional electric fields, termed half-cycle pulses (HCPs), with various well-characterized shapes (rectangular, triangular, and sawtooth) and ...
• #### Isolating the Performance Impacts of Network Interface Cards through Microbenchmarks ﻿

(2004-06-01)
This paper studies the impact of network interface cards (NICs) on network server performance, testing six different Gigabit Ethernet NICs. Even with all other hardware and software configurations unchanged, a network ...
• #### Isotropic Seebeck coefficient of aligned single-wall carbon nanotube films ﻿

(2018)
How the morphology of a macroscopic assembly of nanoobjects affects its properties is a long-standing question in nanomaterials science and engineering. Here, we examine how the thermoelectric properties of a flexible thin ...
• #### Issues in myoelectric teleoperation of complex artificial hands ﻿

(1995)
This dissertation introduces a novel method of teleoperation of complex anthropomorphic robotic hands: converting the myoelectric signal generated by an operator's muscles during movement into robot commands replicating ...
• #### Issues related to data mining with self organizing maps ﻿

(2004)
This thesis demonstrates that the clustering by Kohonen's Self-Organizing Map algorithm (KSOM) can be significantly improved by magnification control. As a second contribution, the thesis proposes a fully automated technique ...
• #### Iterative design of l(p) digital filters ﻿

(2008)
The design of digital filters is a fundamental process in the context of digital signal processing. Being essential building blocks, digital filters are used in diverse areas ranging from medical imaging or audio and video ...
• #### Iterative Multiuser Detection and Decoding ﻿

(1998-11-20)
An iterative detection and decoding algorithm is explored for a convolutionally coded DS-CDMA system. The optimum decoding strategy is to consider the trellises of all the users simultaneously, but this has exponential ...

(1972)
• #### Jacobi-like Matrix Factorizations with CORDIC-based Inexact Diagonalizations ﻿

(1994-06-20)
We propose a CORDIC-based Jacobi-like method for parallel computation of the eigenvalues of Hermitian (and real symmetric) matrices and the SVD of real matrices using inexact diagonalizations. It is predicted on the fact ...
• #### Joint Compression and Speckle Reduction of SAR Images using Embedded Zerotree Models ﻿

(1996-03-01)
We propose a new method for speckle reduction in synthetic aperture radar (SAR) imagery based on the embedded zerotree image compression algorithm. This new approach to denoising is inspired by the realization that the ...
• #### Joint Detection Strategies for Orthogonal Frequency Division Multiplexing ﻿

(2000-04-20)
Traditional OFDM implementations use conventional Fourier filters for data modulation, via the IFFT operation. Much research suggests wavelet based OFDM provides performance gains, due to superior spectral containment ...
• #### Joint detection strategies for orthogonal frequency division multiplexing ﻿

(2000)
Traditional OFDM implementations use conventional Fourier filters for data modulation, via the IFFT operation. Much research suggests wavelet based OFDM provides performance gains, due to superior spectral containment ...
• #### Joint Distributions for Arbitrary Variables ﻿

(1994-10-01)
We compare the methods of Cohen (1971) and of Baraniuk and Jones (see Proc. IEEE ICASSP-93, p.320-323, 1993) for obtaining joint distributions for arbitrary variables. We show that the two methods produce identical results ...
• #### Joint Distributions of Arbitrary Variables Made Easy ﻿

(1998-10-01)
In this paper, we propose a simple framework for studying certain distributions of variables beyond time-frequency and time-scale. When applicable, our results turn the theory of joint distributions of arbitrary variables ...
• #### Joint Distributions of Arbitrary Variables Made Easy ﻿

(1998-09-01)
The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency ...
• #### Joint Distributions of Arbitrary Variables Made Easy ﻿

(1996-09-01)
The successful application of joint time-frequency distributions to problems in time-varying spectral analysis has stimulated considerable interest in distributions of other variables for use when a strict time-frequency ...
• #### Joint multipath-Doppler diversity in fast fading channels ﻿

(1998-11-20)
We present a new framework for code-division multiple access (CDMA) communication over fast fading mobile wireless channels. The performance of the RAKE receiver, which is at the heart of existing CDMA systems, degrades ...