Now showing items 1-10 of 24
Real-time performance analysis of wireless multimedia networks based on partially observed, multivariate point processes
Third-generation (3G) wireless networks will support integrated multimedia services based on a cellular extension of a packet-switched architecture using variants of the Internet protocol (IP). Services can be categorized ...
Energy time dispersion of a new class of magnetospheric ion events observed near the Earth's bow shock
We have analyzed high time resolution (\geq6 s) data during the onset and the decay phase of several energetic (\geq35 keV) ion events observed near the Earth's bow shock by the CCE/AMPTE and IMP-7/8 spacecraft, during ...
Adaptive handoff algorithms based on self-organizing neural networks to enhance the quality of service of nonstationary traffic in hierarchical cellular networks
Third-generation (3G) wireless networks, based on a hierarchical cellular structure (HCS), support tiered levels of multimedia services. These services can be categorized as real-time and delay-sensitive, or non-real-time ...
Pattern classification approach to underwater acoustic communications based on the Wigner-Ville distribution
This paper describes an approach and preliminary results associated with the use of pattern recognition techniques to identify transmitted information (symbols) in a temporally variant acoustic channel. The method allows ...
Wavelet-based image compression using randomized quantization
We applied dithered quantization to image compression using a wavelet transform, scalar quantization method. The results indicate that dithered quantization could change the noise characteristics ofthe reconstructed image.
Computation for crosstalk effects in p-on-n Hg1-xCdxTe heterojunction IRFPA radiated by using uniformly parallel light
in our work, a three-dimensional IRFPA model has been constructed to conduct device simulations for drift-diffusion based Hg1 CdTe devices. The model uses the finite element method and numerical errors are automatically ...
Numerical simulation of the marine atmospheric boundary layer flow over the Cape Canaveral region and Gulf Stream using AVHRR SST - an atmospheric seabreeze model
An atmospheric mesoscale numerical model has been developed and applied to the marine atmospheric boundary layer (MABL) in the vicinity of sharp sea-surface temperature (SST) gradients. The Gulf Stream offshore ofEast ...
Bit-allocation considering mean absolute error for image compression
In lossy image compression schemes, often some distortion measure is minimized to arrive at a desired target bit rate. The distortion measure that has been most studied is the mean-squared-error (MSE). However, perceptual ...
Enhanced three-dimensional reconstruction of surfaces using multicolor gratings
Most optical topolography systems use a single-wavelength laser for projection, using a swept spot, a moving line, or a projected grating. In a typical projected grating system, the gratings are shifted and a series of ...
Circular optimal trade-off and distance-classifier correlation filters
We use circular versions of advanced distortion-invariant filters such as optimal trade-off synthetic discriminant function and distance classifier correlation filters to obtain rotation invariance with an optical correlator. ...