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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Mathews, V. John | A new model of perceptual threshold functions for application in image compression systems | This paper discusses the development of a perceptual threshold model for the human visual system. The perceptual threshold functions describe the levels of distortions present at each location in an image that human observers can not detect. Models of perceptual threshold functions are useful in ima... | 1995 | |
| 2 |
 | Mathews, V. John | Adaptive volterra filters using orthogonal structures | Abstract- This paper presents an adaptive Volterra filter that employs a recently developed orthogonalization procedure of Gaussian signals for Volterra system identification. The algorithm is capable of handling arbitrary orders of nonlinearity P as well as arbitrary lengths of memory N for the sys... | 1995 | |
| 3 |
 | Mathews, V. John | An optimal design procedure for intraband vector quantized subband coding | AbstTact- Subband coding with vector quantization is addressed in this paper. Forming the data vectors from both between and within the subbands is considered. The former of these two schemes is referred to as interband coding and the latter as intraband coding. Interband coder design is relatively ... | 1995 | |
| 4 |
 | Stringfellow, Gerald B. | Atomic force microscopy study of ordered GaInP | Examines the nature of the steps on the surface of gallium indium phosphide lattice layers matched to gallium arsenide substrates using atomic force microscopy. Temperatures of organometallic vapor phase epitaxy used; Relation of height of steps with misorientation angle; Link of supersteps with the... | Surface chemistry; Lattice theory | 1995 |
| 5 |
 | Stringfellow, Gerald B.; Williams, Clayton C. | Atomic ordering of GaInP studied by Kelvin probe force microscopy | The atomic ordering of GaInP has been established and studied by a variety of methods, including transmission electron microscopy, cathodoluminescence, and photoluminescence. In this work, a Kelvin probe force microscope _x0002_KPFM_x0003_ has been employed to image several GaInP samples previous... | Cathodoluminescence; Photoluminescence; Surface morphology | 1995 |
| 6 |
 | Mathews, V. John | Massively parallel algorithm for vector quantization | This paper is concerned with the parallel implementation of a vector quantizer system on Maspar MP-2, a single-instruction, multiple-data (SIMD) massively parallel computer. A vector quantizer (VQ) consists of two mappings: an encoder and a decoder. The encoder assigns to each input vector the inde... | 1995 | |
| 7 |
 | Mathews, V. John | Orthogonalization of correlated gaussian signals for volterra system identification | This letter presents a simple method for orthogonalizing correlated Gaussian input signals for identification of truncated Volterra systems of arbitrary order of nonlinearity P and memory length N. The procedure requires a Gram-Schmidt orthogonalizer for a vector containing N elements and some nonli... | 1995 | |
| 8 |
 | Mathews, V. John | Output-error LMS bilinear filters with stability monitoring | ABSTRACT This paper introduces output-error LMS bilinear filters with stability monitoring. Bilinear filters are recursive nonlinear systems that belong to the class of polynomial systems. Because of the feedback structure, such models are able to represent many nonlinear systems efficiently. ... | 1995 | |
| 9 |
 | Stringfellow, Gerald B. | Surface photo-absorption studies of the chemical structure of GaInP grown by organometallic vapor phase epitaxy | The surface structure of Ga0.52In0.48P was studied by surface photoabsorption. An absorption peak due to P dimers on Ga0.52In0.48P was observed at 400 nm, shorter than for InP (430 nm). From comparison with results for GaAs and InP, the data are interpreted to indicate that at a tertiarybutylphos... | Absorption peak; Ordering; Substrate orientation | 1995 |
| 10 |
 | Myers, Chris J. | Technology mapping of timed circuits | Abstract This paper presents an automated procedure for the technology mapping of timed circuits to practical gate libraries. Timed circuits are a class of asynchronous circuits that incorporate explicit timing information in the specification which is used throughout the design process to optimi... | 1995 | |
| 11 |
 | Mathews, V. John | Vector quantization of images using the L∞ distortion measure | This paper considers vector quantization of signals using the Loo distortion measure. The key contribution is a result that allows one to characterize the centroid of a set of vectors for the Loo distortion measure. A method similar to the LBG algorithm for designing codebooks has been develope... | 1995 | |
| 12 |
 | Furse, Cynthia M.; Gandhi, Om P. | Why the DFT is faster than the FFT for FDTD time-to-frequency domain conversions | Although it is a time-domain method, the finite difference time-domain (FDTD) method has been used extensively for calculating frequency domain parameters such as specific absorption rate, radar cross-section, and S-parameters. When a broad frequency band is of interest, using a broad-band pulsed ... | Discrete Fourier transform; DFT; Fast Fourier transform; FFT; Finite-difference time-domain; FDTD; Frequency domain parameters | 1995-10 |
| 13 |
 | Stringfellow, Gerald B. | Effect of step structure on ordering in GaInP | Examines the effect of step structure on ordering in gallium indium phosphite (GaInP) using atomic force microscopy. Coverage of the surface by islands several monolayers in height with elongated direction; Formation of the edges of the islands; Role of the observations in explaining the nature of t... | Gallium indium phosphite (GaInP); Twin boundaries | 1995-11-12 |
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