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Articles 1 - 14 of 14
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Blur Identification Based On Higher Order Spectral Nulls, Andreas Savakis, Roger L. Easton
Blur Identification Based On Higher Order Spectral Nulls, Andreas Savakis, Roger L. Easton
Articles
The identification of the point spread function (PSF) from the degraded image data constitutes an important first step in image restoration that is known as blur identification. Though a number of blur identification algorithms have been developed in recent years, two of the earlier methods based on the power spectrum and power cepstrum remain popular, because they are easy to implement and have proved to be effective in practical situations. Both methods are limited to PSF's which exhibit spectral nulls, such as due to defocused lens and linear motion blur. Another limitation of these methods is the degradation of their …
Chaos, Period-Doubling And Reverse Bifurcations In An Optically Injected Semiconductor Laser, Vassilios Kovanis, Athanasios Gavrielides, Thomas Simpson
Chaos, Period-Doubling And Reverse Bifurcations In An Optically Injected Semiconductor Laser, Vassilios Kovanis, Athanasios Gavrielides, Thomas Simpson
Articles
In conclusion, we have observed a reverse bifurcation from chaotic to periodic dynamics in a semiconductor laser subject to strong optical injection at its free-running frequency. Spontaneous emission noise effects obscure specific spectral features in the reverse period-doubling region, but by measuring the dynamic parameters of the laser we have shown that the coupled complex-field and carrier density model accounts for the observed spectra.
Controlling Unstable Periodic Orbits In A Nonlinear Optical System: The Ikeda Map, Paul Alsing, Athanasios Gavrielides, Vassilios Kovanis
Controlling Unstable Periodic Orbits In A Nonlinear Optical System: The Ikeda Map, Paul Alsing, Athanasios Gavrielides, Vassilios Kovanis
Articles
With the publication of the seminal paper by Ott, Grebogi and Yorke (OGY) [l] the concept of controlling chaos has become part of the lexicon of physicists and engineers dealing with chaotic nonlinear dynamical systems. The authors showed that by using small, judiciously applied perturbations the unstable periodic orbits, which are dense in a chaotic attractor, could be stabilized. The strength of their approach lies in the absence of the necessity for any a priori analytical model of the chaotic system in order to affect the control. The information required to construct the controlling perturbations can be extracted from experimental …
The Psychological Consequence Of A Bypass Operation: All Of The Things About A Heart Bypass Operation That Your Physicians Were Too Busy To Tell You!, Morton Isaacs
Articles
No abstract provided.
Ion Implantation Of Porous Silicon, C. Peng, Philippe M. Fauchet, J. M. Rehm, G. L. Mclendon, F. Seiferth, Santosh K. Kurinec
Ion Implantation Of Porous Silicon, C. Peng, Philippe M. Fauchet, J. M. Rehm, G. L. Mclendon, F. Seiferth, Santosh K. Kurinec
Articles
Investigates the ion implantation of porous silicon (Si). Properties of light-emitting Si; Application of continuous-wave and time dependent photoluminescence spectroscopies; Comparison of dopant implantation effect in varying doses.
Optimal Nonlinear Estimation Of Linear Stochastic Systems, Mark Hopkins, H.F. Vanlandingham
Optimal Nonlinear Estimation Of Linear Stochastic Systems, Mark Hopkins, H.F. Vanlandingham
Articles
No abstract provided.
Flexible, Dry-Released Process For Aluminum Electrostatic Actuators, Christopher Storment, David Borkholder, Victor Westerlind
Flexible, Dry-Released Process For Aluminum Electrostatic Actuators, Christopher Storment, David Borkholder, Victor Westerlind
Articles
We present an all-aluminum MEMS process (Al- MEMS) for the fabrication of large-gap electrostatic actuators with process steps that are compatible with the future use of underlying, pre-fabricated CMOS control circuitry. The process is purely additive above the substrate as opposed to processes that depend on etching pits into the silicon, and thereby permits a high degree of design freedom. Multilayer aluminum metalization is used with organic sacrificial layers to build up the actuator structures. Oxygen-based dry etching is used to remove the sacrificial layers. While this approach has been previously used by other investigators to fabricate optical modulators and …
Approximate Solutions Of Systems Of Fuzzy Relation Equations, George Klir, Bo Yuan
Approximate Solutions Of Systems Of Fuzzy Relation Equations, George Klir, Bo Yuan
Articles
In this paper, we generalize our previous results regarding approximate solutions of fuzzy relation equations to systems of fuzzy relation equations. By employing the equality index proposed by Gottwald, we introduce a goodness measure of the performance of approximate solutions and derive a lower bound and an upper bound of solvability of s stems of fuzzy relation equations. We also show that our results generalize those presented for one-dimensional fuzzy relation equations in [2].
The Measurement Of Surface-Topography Of Materials By Analysis Of Goniometric Reflection Of Light - Factors Governing Precision And Accuracy, Jonathan Arney, Theodore Tantalo, D. Stewart
The Measurement Of Surface-Topography Of Materials By Analysis Of Goniometric Reflection Of Light - Factors Governing Precision And Accuracy, Jonathan Arney, Theodore Tantalo, D. Stewart
Articles
No abstract provided.
An Algebraic Mask For Halftone Dithering, Peter Anderson
An Algebraic Mask For Halftone Dithering, Peter Anderson
Articles
This article may be accessed on the publisher's website (additional fees may apply) at: http://www.imaging.org/store/epub.cfm?abstrid=2450 We present a novel class of dispersed-dot masks for digital halftoning. These masks are based on simple algebraic rules using a Fibonacci-like number sequence (also known as linear pixel shuffling (Anderson, 1993)), which permits masks of an unlimited variety of sizes and number of discrete gray levels to be easily constructed. The masks tile the plane, but not necessarily ina rectangular manner. They produce seamless halftoned images.
The Paradoxical Success Of Fuzzy Logic, Charles Elkan
The Paradoxical Success Of Fuzzy Logic, Charles Elkan
Articles
1993 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Applications of fuzzy logic in heuristic control have been highly successful, but which aspects of fuzzy logic are essential to its practical usefulness? This paper shows that an apparently reasonable version of fuzzy logic collapses mathematically to two-valued logic. Moreover, there are few if any published reports of …
Simulation Study Of Changes In Ultrasound Speckle Statistics With The System Point Spread Function, Navalgund A. H. K. Rao, Hui Zhu
Simulation Study Of Changes In Ultrasound Speckle Statistics With The System Point Spread Function, Navalgund A. H. K. Rao, Hui Zhu
Articles
The intensity point signal-to-noise ratio, SNRI, characterizing the ultrasound speckle statistics, depends on the tissue scattering microstructure and the imaging systems point spread function. Both should be described in three-dimensional space. Therefore, a three-dimensional simulation model is used in this paper to generate a rf signal and study the variations in SNRI with the transducer center frequency and bandwidth. Results are in agreement with existing theoretical predictions. A possible method to analyze the SNRI data is also presented that can produce a straight line slope as a feature value that depends on the tissue scattering microstructure only. Such a feature …
Paths, Cycles And Wheels In Graphs Without Antitriangles, Stanislaw Radziszowski, Xia Jin
Paths, Cycles And Wheels In Graphs Without Antitriangles, Stanislaw Radziszowski, Xia Jin
Articles
We investigate paths, cycles and wheels in graphs with independence number of at most 2, in particular we prove theorems characterizing all such graphs which are hamiltonian. Ramsey numbers of the form R (G,K3), for G being a path, a cycle or a wheel, are known to be 2n (G) - 1, except for some small cases. In this paper we derive and count all critical graphs 1 for these Ramsey numbers.
On (N,5,3)-Turan Systems, Elizabeth Boyer, Donald Kreher, Stanislaw Radziszowski
On (N,5,3)-Turan Systems, Elizabeth Boyer, Donald Kreher, Stanislaw Radziszowski
Articles
The minimal number of triples required to represent all quintuples on an n-element set is determined for n <= 13 and all extremal constructions are found. In particular we establish that there is a unique minimal system on 13 points, namely the 52 collinear triples of the projective plane of order 3.