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- Keyword
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- Stars: Oscillations (5)
- White Dwarfs (4)
- Hyperspectral remote sensing (3)
- Stars: Interiors (3)
- Ground truth (2)
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- Image processing (2)
- Image transform (2)
- Interplanetary Medium (2)
- Modeling (2)
- Remote sensing (2)
- Stars: Atmospheres (2)
- Stars: Horizontal-Branch (2)
- Stars: Individual: PG 1325+101 (2)
- Sun: Particle Emission (2)
- Water surface reflectance (2)
- Wavelet (2)
- Wavelet transform (2)
- Wireless sensor networks (2)
- Acceleration Of Particles (1)
- Accretion (1)
- Accretion Disks (1)
- Ad hoc wireless (1)
- Adaptive (1)
- Adaptive optics (1)
- Algorithms (1)
- Aquatic remote sensing (1)
- Arachidonic acid (1)
- Benthic habitat (1)
- Binaries: Close (1)
- Cellular neural networks (1)
- Publication
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- Aerospace, Physics, and Space Science Faculty Publications (18)
- Electrical Engineering and Computer Science Faculty Publications (15)
- Mathematics and System Engineering Faculty Publications (7)
- Ocean Engineering and Marine Sciences Faculty Publications (6)
- Link Foundation Energy Fellowship Reports (3)
Articles 1 - 30 of 53
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Machine Learning For Computer Security, Philip K. Chan, Richard P. Lippmann
Machine Learning For Computer Security, Philip K. Chan, Richard P. Lippmann
Electrical Engineering and Computer Science Faculty Publications
The prevalent use of computers and internet has enhanced the quality of life for many people, but it has also attracted undesired attempts to undermine these systems. This special topic contains several research studies on how machine learning algorithms can help improve the security of computer systems.
Iron In Hot Da White Dwarfs, Stéphane Vennes, Pierre Chayer, Jean François Dupuis, Thierry M. Lanz
Iron In Hot Da White Dwarfs, Stéphane Vennes, Pierre Chayer, Jean François Dupuis, Thierry M. Lanz
Aerospace, Physics, and Space Science Faculty Publications
We present a study of the iron abundance pattern in hot, hydrogen-rich (DA) white dwarfs. The study is based on new and archival far-ultraviolet spectroscopy of a sample of white dwarfs in the temperature range 30,000 K ≲ Teff ≲ 64,000 K. The spectra obtained with the Far Ultraviolet Spectroscopic Explorer, along with spectra obtained with the Hubble Space Telescope Imaging Spectrograph and the International Ultraviolet Explorer, sample Fe III-Fe VI absorption lines, enabling a detailed iron abundance analysis over a wider range of effective temperatures than previously afforded. The measurements reveal abundance variations in excess of 2 orders of …
Target Dna Structure Plays A Critical Role In Rag Transposition, Jennifer E. Posey, Malgorzata J. Pytios, Richard R. Sinden, David B. Roth
Target Dna Structure Plays A Critical Role In Rag Transposition, Jennifer E. Posey, Malgorzata J. Pytios, Richard R. Sinden, David B. Roth
Biomedical Engineering and Sciences Faculty Publications
Antigen receptor gene rearrangements are initiated by the RAG1/2 protein complex, which recognizes specific DNA sequences termed RSS (recombination signal sequences). The RAG recombinase can also catalyze transposition: integration of a DNA segment bounded by RSS into an unrelated DNA target. For reasons that remain poorly understood, such events occur readily in vitro, but are rarely detected in vivo. Previous work showed that non-B DNA structures, particularly hairpins, stimulate transposition. Here we show that the sequence of the four nucleotides at a hairpin tip modulates transposition efficiency over a surprisingly wide (>100-fold) range. Some hairpin targets stimulate extraordinarily efficient …
Further Evidence For Variable Synchrotron Emission In Xte J1118+480 In Outburst, Robert I. Hynes, Edward L. Robinson, Kevin J. Pearson, Dawn M. Gelino, Wei Cui, Yongquan Xue, Matt A. Wood, Todd K. Watson, Don Earl Winget, Isaac M. Silver
Further Evidence For Variable Synchrotron Emission In Xte J1118+480 In Outburst, Robert I. Hynes, Edward L. Robinson, Kevin J. Pearson, Dawn M. Gelino, Wei Cui, Yongquan Xue, Matt A. Wood, Todd K. Watson, Don Earl Winget, Isaac M. Silver
Aerospace, Physics, and Space Science Faculty Publications
We present simultaneous multicolor infrared and optical photometry of the black hole X-ray transient XTE Jill 8+480 during its short 2005 January outburst, supported by simultaneous X-ray observations. The variability is dominated by short timescales, ∼10 s, although a weak superhump also appears to be present in the optical. The optical rapid variations, at least, are well correlated with those in X-rays. Infrared JHKS photometry, as in the previous outburst, exhibits especially large-amplitude variability. The spectral energy distribution (SED) of the variable infrared component can be fitted with a power law of slope α = -0.78 ± 0.07, where Fᵧ …
Oxidized Derivatives Of Ω-3 Fatty Acids: Identification Of Ipf 3Α-Vi In Human Urine, John A. Lawson, Seongjin Kim, William S. Powell, Garret Gerald A. Fitzgerald, Joshua Rokach
Oxidized Derivatives Of Ω-3 Fatty Acids: Identification Of Ipf 3Α-Vi In Human Urine, John A. Lawson, Seongjin Kim, William S. Powell, Garret Gerald A. Fitzgerald, Joshua Rokach
Chemistry and Chemical Engineering Faculty Publications
Isoprostanes (iPs) are prostaglandin-like molecules derived from autoxidation of polyunsaturated fatty acids (PUFAs). Urinary iP levels have been used as indices of in vivo lipid peroxidation. Thus far, it has only been possible to measure iPs derived from arachidonic acid in urine, because levels of iPs/neuroprostanes (nPs) derived from ω3-PUFAs have been found to be below detection limits of available assays. Because of the interest in ω3-PUFA dietary supplementation, we developed specific methods to measure nPF4α-VI and iPF3α-VI [derived from 4,7,10,13,16,19-docosahexaenoic acid (DHA) and 5,8,11,14,17-eicosapentaenoic acid (EPA)] using a combination of chemical synthesis, gas chromatography/mass spectrometry (GC/MS), andliquid chromatography tandem …
Denoising Of Imagery For Inspection Tasks Using Higher-Order Statistics, Samuel Peter Kozaitis
Denoising Of Imagery For Inspection Tasks Using Higher-Order Statistics, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
We reduced noise in images using a higher-order, correlation-based method. In this approach, wavelet coefficients were classified as either mostly noise or mostly signal based on third-order statistics. Because the higher than second-order moments of the Gaussian probability function are zero, the third-order correlation coefficient may not have a statistical contribution from Gaussian noise. Using a detection algorithm derived from third-order statistics, we determined if a wavelet coefficient was noisy by looking at its third-order correlation coefficient. Using imagery of space shuttle tiles, our results showed that the minimum mean-squared error obtained using third-order statistics was often less than that …
Optimal Band Selection For Hyperspectral Remote Sensing Of Aquatic Benthic Features - A Wavelet Filter Window Approach, Charles R. Bostater
Optimal Band Selection For Hyperspectral Remote Sensing Of Aquatic Benthic Features - A Wavelet Filter Window Approach, Charles R. Bostater
Ocean Engineering and Marine Sciences Faculty Publications
This paper describes a wavelet based approach to derivative spectroscopy. The approach is utilized to select, through optimization, optimal channels or bands to use as derivative based remote sensing algorithms. The approach is applied to airborne and modeled or synthetic reflectance signatures of environmental media and features or objects within such media, such as benthic submerged vegetation canopies. The technique can also applied to selected pixels identified within a hyperspectral image cube obtained from an board an airborne, ground based, or subsurface mobile imaging system. This wavelet based image processing technique is an extremely fast numerical method to conduct higher …
A Pixel To Pixel Hyperspectral Synthetic Image Model Inter-Comparison Study, Charles R. Bostater, Luce Bassetti
A Pixel To Pixel Hyperspectral Synthetic Image Model Inter-Comparison Study, Charles R. Bostater, Luce Bassetti
Ocean Engineering and Marine Sciences Faculty Publications
The purpose of this paper is to present simulation results comparing e a Monte Carlo Hyperspectral Simulation Model (MCHSIM) which generates synthetic images with realistic water wave surface to an iterative layered radiative transfer model used to generate hyperspectral synthetic images with realistic water wave surfaces. The Monte Carlo model is divided into 5 steps: (1) generation of the photons, (2) tracking of the photon optical path and simultaneously (3) recording of the photon's location within the water column, (4) a tabulation of the photon location or positions, and conversion to meaningful radiometric quantities and (5) a calculation and processing …
Sensor Motion Control & Mobile Platforms For Aquatic Remote Sensing, Charles R. Bostater
Sensor Motion Control & Mobile Platforms For Aquatic Remote Sensing, Charles R. Bostater
Ocean Engineering and Marine Sciences Faculty Publications
Modern remote sensing systems used in repetitive environmental monitoring and surveillance applications are used on various platforms. These platforms can be categorized as stationary (fixed) or moving platforms. The sensing systems monitor the ambient environment which also may have inherent motion, such as the water surface with water waves. This is particularly the case for airborne or ship borne sensing of aquatic environments and is true for ground based walking or crawling systems. The time sequential comparison and spatial registration of sensor images, particularly "hyperspectral imagery" requires pixel to pixel registration for science based change and target (or medium) detection …
Link Foundation Fellowship Report, Patrick Flannery
Link Foundation Fellowship Report, Patrick Flannery
Link Foundation Energy Fellowship Reports
The last 25 years have seen dramatic maturation of the wind energy industry. Increases in wind energy production have been tied to advancements in turbine technology, reliability, and grid compatibility; wind resource assessment, and reductions in costs. Wind energy is economically competitive with, and environmentally superior to conventional fossil and nuclear fuel-based electric power plants. Wind turbine grid connection requirements have become more demanding concomitant with increasing grid penetration. Wind generation system are now required to perform many of the duties of conventional electric power plants, such as stabilization of the grid during fault events. Unfortunately the most common and …
Implementation Of A Ground Truth Process For Development Of A Submerged Aquatic Vegetation (Sav) Mapping Protocol Using Hyperspectral Imagery, Carlton R. Hall, Charles R. Bostater, Robert W. Virnstein
Implementation Of A Ground Truth Process For Development Of A Submerged Aquatic Vegetation (Sav) Mapping Protocol Using Hyperspectral Imagery, Carlton R. Hall, Charles R. Bostater, Robert W. Virnstein
Ocean Engineering and Marine Sciences Faculty Publications
Protocol development for science based mapping of submerged aquatic vegetation (SAV) requires comprehensive ground truth data describing the full range of variability observed in the target. The Indian River Lagoon, Florida, extends along 250 km of the east central Florida coast adjacent to the Atlantic Ocean. The lagoon crosses the transition zone between the Caribbean and Carolinian zoogeographic provinces making it highly diverse. For large scale mapping and management of SAV four common and three uncommon species of seagrass (Tracheophyta) and three broad groups of macroalgae; red algae (Rhodophyta), green algae (Chlorophyta), and brown algae (Phaeophyta) are recognized. Based on …
Evaluation And Engineering Of Saccharomyces Cerevisiae For Cellulase Expression And Growth On Insoluble Cellulose, John Mcbride
Evaluation And Engineering Of Saccharomyces Cerevisiae For Cellulase Expression And Growth On Insoluble Cellulose, John Mcbride
Link Foundation Energy Fellowship Reports
The conversion of cellulosic biomass into fuels and chemicals promises to be a major revolution for the United States economy, but is dependent on the advancement of low-cost conversion technology. Of the natural resources available to human societies, biomass is one of the most abundant, and is the sole sustainable source of organic fuels, chemicals, and materials [1]. Biomass derived fuels and chemicals can achieve net zero carbon emissions on a lifecycle basis, provide substantial income to rural communities, and eliminate the security issues associated with fossil resources. Cellulosic biomass (wood, grass, agricultural residues, etc.) can be produced cheaply and …
Heavy-Ion Elemental Abundances In Large Solar Energetic Particle Events And Their Implications For The Seed Population, Mihir I. Desai, Glenn M. Mason, Robert E. Gold, Stamatios M. Krimigis, Christina M.S. Cohen, Richard A. Mewaldt, Joseph E. Mazur, Joseph R. Dwyer
Heavy-Ion Elemental Abundances In Large Solar Energetic Particle Events And Their Implications For The Seed Population, Mihir I. Desai, Glenn M. Mason, Robert E. Gold, Stamatios M. Krimigis, Christina M.S. Cohen, Richard A. Mewaldt, Joseph E. Mazur, Joseph R. Dwyer
Aerospace, Physics, and Space Science Faculty Publications
We have surveyed the ∼0.1-10 MeV nucleonˉ¹ abundances of heavy ions from ³He through Fe in 64 large solar energetic particle (LSEP) events observed on board the Advanced Composition Explorer from 1997 November through 2005 January. Our main results are (1) the 0.5-2.0 MeV nucleonˉ¹ ³He/⁴He ratio is enhanced between factors of ∼2-150 over the solar wind value in 29 (∼46%) events. (2) The Fe/O ratio in most LSEP events decreases with increasing energy up to ∼60 MeV nucleonˉ¹. (3) The Fe/O ratio is independent of CME speed, flare longitude, event size, the ³He/⁴He ratio, the pre-event Fe/O ratio, and …
The Role Of Interplanetary Scattering In Western Hemisphere Large Solar Energetic Particle Events, Glenn M. Mason, Mihir I. Desai, Christina M.S. Cohen, Richard A. Mewaldt, Edward C. Stone, Joseph R. Dwyer
The Role Of Interplanetary Scattering In Western Hemisphere Large Solar Energetic Particle Events, Glenn M. Mason, Mihir I. Desai, Christina M.S. Cohen, Richard A. Mewaldt, Edward C. Stone, Joseph R. Dwyer
Aerospace, Physics, and Space Science Faculty Publications
Using high-sensitivity instruments on the ACE spacecraft, we have examined the intensities of O and Fe in 14 large solar energetic particleevents whose parent activity was in the solar western hemisphere. Sampling the intensities at low (∼273 keV nucleonˉ¹) and high (∼12 MeV nucleonˉ¹) energies, we find that at the same kinetic energy per nucleon, the Fe/O ratio decreases with time, as has been reported previously. This behavior is seen in more than 70% of the cases during the rise to maximum intensity and continues in most cases into the decay phase. We find that for most events if we …
Whole Earth Telescope Observations Of The Pulsating Subdwarf B Star Pg 0014+067, Maja Vučković, Matt A. Wood, V. Wilkat
Whole Earth Telescope Observations Of The Pulsating Subdwarf B Star Pg 0014+067, Maja Vučković, Matt A. Wood, V. Wilkat
Aerospace, Physics, and Space Science Faculty Publications
PG 0014+067 is one of the most promising pulsating subdwarf B stars for seismic analysis, as it has a rich pulsation spectrum. The richness of its pulsations, however, poses a fundamental challenge to understanding the pulsations of these stars, as the mode density is too complex to be explained only with radial and nonradial low-degree (l < 3) p-modes without rotational splittings. One proposed solution, suggested by Brassard et al. in 2001 for the case of PG 0014+067 in particular, assigns some modes with high degree (l - 3). On the other hand, theoretical models of sdB stars suggest that they may retain rapidly rotating cores, and so the high mode density may result from the presence of a few rotationally split triplet (l = 1) and quintuplet (l = 2) modes, along with radial (l = 0)p-modes. To examine alternative theoretical models for these stars, we need better frequency resolution and denser longitude coverage. Therefore, we observed this star with the Whole Earth Telescope for two weeks in 2004 October. In this paper we report the results of Whole Earth Telescope observations of the pulsating subdwarf B star PG 0014+067. We find that the frequencies seen in PG 0014+067 do not appear to fit any theoretical model currently available; however, we find a simple empirical relation that is able to match all of the well-determined frequencies in this star.
Solar Cycle Variations In The Composition Of The Suprathermal Heavy-Ion Population Near 1 Au, Mihir I. Desai, Glenn M. Mason, Joseph E. Mazur, Joseph R. Dwyer
Solar Cycle Variations In The Composition Of The Suprathermal Heavy-Ion Population Near 1 Au, Mihir I. Desai, Glenn M. Mason, Joseph E. Mazur, Joseph R. Dwyer
Aerospace, Physics, and Space Science Faculty Publications
We have measured the annual variation in the quiet-time composition of interplanetary suprathermal ions between 0.04 and 1 MeV nucleon-1 from 1994 November 20 through 2006 January 1. Our results show the following: (1) The C/O and Fe/O ratios are similar to the corresponding values measured in the solar wind and corotating interaction regions (CIRs) during solar minimum conditions of 1994-1997 and 2005. (2) During periods of increased solar activity between 1998 and 2002, the C/O ratio is similar to that measured in solar energetic particle (SEP) events, while the Fe/O ratio lies between the values measured in coronal mass …
Lp 400-22, A Very Low Mass And High-Velocity White Dwarf, Adéla Kawka, Stéphane Vennes, Terry D. Oswalt, J. Allyn Smith, Nicole M. Silvestri
Lp 400-22, A Very Low Mass And High-Velocity White Dwarf, Adéla Kawka, Stéphane Vennes, Terry D. Oswalt, J. Allyn Smith, Nicole M. Silvestri
Aerospace, Physics, and Space Science Faculty Publications
We report the identification of LP 400-22 (WD 2234+222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 ± 140 K and a surface gravity of log g = 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M⊙. The tangential velocity of this white dwarf is 414 ± 43 km s-1, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this …
Basic Properties Of Sobolev's Spaces On Time Scales, Ravi P. Agarwal, Victoria Otero-Espinar, Kanishka Perera, Dolores R. Vivero
Basic Properties Of Sobolev's Spaces On Time Scales, Ravi P. Agarwal, Victoria Otero-Espinar, Kanishka Perera, Dolores R. Vivero
Mathematics and System Engineering Faculty Publications
We study the theory of Sobolev's spaces of functions defined on a closed subinterval of an arbitrary time scale endowed with the Lebesgue Δ-measure; analogous properties to that valid for Sobolev's spaces of functions defined on an arbitrary open interval of the real numbers are derived.
Spectroscopic Identification Of Cool White Dwarfs In The Solar Neighborhood, Adela Kawka, Stéphane Vennes
Spectroscopic Identification Of Cool White Dwarfs In The Solar Neighborhood, Adela Kawka, Stéphane Vennes
Aerospace, Physics, and Space Science Faculty Publications
The New Luyten Two-Tenths catalog contains a large number of high proper motion white dwarf candidates that remain to be spectroscopically confirmed. We present new spectroscopic observations, as well as SDSS archival spectra of 49 white dwarf candidates selected from the revised NLTT catalog of Salim & Gould. Of these, 34 are cool DA white dwarfs with temperatures ranging from approximately 5000 up to 11,690 K, and 11 are DC white dwarfs with temperatures ranging from 4300 K (NLTT 18555) up to 11,000 K. Three of the DA white dwarfs also display abundances of heavy elements (NLTT 3915, NLTT 44986, …
Image Fusion For Improved Perception, Michel Ouendeno, Samuel Peter Kozaitis
Image Fusion For Improved Perception, Michel Ouendeno, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
We developed a method to fuse imagery for from different sensor types. The core of our method uses different forward transforms of input images and a common transform to reconstruct the final result. When measuring the entropy and power of the fused result, we found that our method gave generally better results when compared to a more conventional approach. Our method could form the basis of a new image fusion approach because it offers results not possible with a conventional approach.
Characterization Of Transmission Lines At Ir, Tasneem A. Mandviwala, José Manuel López-Alonso, Brian A. Lail, Glenn D. Boreman
Characterization Of Transmission Lines At Ir, Tasneem A. Mandviwala, José Manuel López-Alonso, Brian A. Lail, Glenn D. Boreman
Electrical Engineering and Computer Science Faculty Publications
We demonstrate the first long wave infrared (LWIR) transmission line design and characterization. Two of the widely used transmission-lines: coplanar striplines (CPS) and microstrip (MS) lines are characterized at IR frequency (28.3THz), in terms of transmission line parameters: characteristic impedance (Z₀, attenuation constant (α) and effective index of refraction (nᵉᶠᶠ), through modeling, fabrication and measurement. These transmission-line parameters cannot be directly measured, what can be measured is the antenna response. So we compute, measure and compare the response of the dipole antenna connected to these transmission lines as a function of transmission-line length. The response depends on the transformation of …
Communications Protocol For Rf-Based Indoor Wireless Localization Systems, Tamas Kasza, Mohammad Mehdi Shahsavari, Veton Z. Këpuska
Communications Protocol For Rf-Based Indoor Wireless Localization Systems, Tamas Kasza, Mohammad Mehdi Shahsavari, Veton Z. Këpuska
Electrical Engineering and Computer Science Faculty Publications
A novel application-specific communications scheme for RF-based indoor wireless localization networks is proposed. In such a system wireless badges, attached to people or objects, report positions to wireless router units. Badges have very limited communication, energy, and processing capabilities. Routers are responsible for propagating collected badge information hop-by-hop toward one central unit of the system and are significantly less constrained by battery than the badges. Each unit can radiate a special sequence of bits at selected frequencies, so that any router in the wireless neighborhood can sense, store, aggregate and forward Received Signal Strength Indicator (RSSI) information. Once the central …
Intelligent Routing Protocol For Ad Hoc Wireless Network, Chaorong Peng, Chang Wen Chen
Intelligent Routing Protocol For Ad Hoc Wireless Network, Chaorong Peng, Chang Wen Chen
Electrical Engineering and Computer Science Faculty Publications
A novel routing scheme for mobile ad hoc networks (MANETs), which combines hybrid and multi-inter-routing path properties with a distributed topology discovery route mechanism using control agents is proposed in this paper. In recent years, a variety of hybrid routing protocols for Mobile Ad hoc wireless networks (MANETs) have been developed. Which is proactively maintains routing information for a local neighborhood, while reactively acquiring routes to destinations beyond the global. The hybrid protocol reduces routing discovery latency and the end-to-end delay by providing high connectivity without requiring much of the scarce network capacity. On the other side the hybrid routing …
Information-Aware Collaborative Routing In Wireless Sensor Network, Ji Sun Lee, Chang Wen Chen
Information-Aware Collaborative Routing In Wireless Sensor Network, Ji Sun Lee, Chang Wen Chen
Electrical Engineering and Computer Science Faculty Publications
In this paper, we propose a new approach to routing protocol called information-aware collaborative routing for wireless sensor networks. Clustering and local data aggregation schemes have been developed to reduce the energy for transmitting redundant data in the wireless sensor network. Most existing approaches have been developed for the cases when there is direct communication between cluster head and base station. Even though these schemes are able to reduce data redundancy to be transmitted from the cluster heads to the base station, they have not exploited the data redundancy between neighboring clusters. In this research, we study a more general …
An Adaptive Distributed Data Aggregation Based On Rcpc For Wireless Sensor Networks, Guogang Hua, Chang Wen Chen
An Adaptive Distributed Data Aggregation Based On Rcpc For Wireless Sensor Networks, Guogang Hua, Chang Wen Chen
Electrical Engineering and Computer Science Faculty Publications
One of the most important design issues in wireless sensor networks is energy efficiency. Data aggregation has significant impact on the energy efficiency of the wireless sensor networks. With massive deployment of sensor nodes and limited energy supply, data aggregation has been considered as an essential paradigm for data collection in sensor networks. Recently, distributed source coding has been demonstrated to possess several advantages in data aggregation for wireless sensor networks. Distributed source coding is able to encode sensor data with lower bit rate without direct communication among sensor nodes. To ensure reliable and high throughput transmission with the aggregated …
Robust Image Transmission Over Mimo Space-Time Coded Wireless Systems, Daewon Song, Chang Wen Chen
Robust Image Transmission Over Mimo Space-Time Coded Wireless Systems, Daewon Song, Chang Wen Chen
Electrical Engineering and Computer Science Faculty Publications
We present in this paper an integrated robust image transmission scheme using space-time block codes (STBC) over multi-input multi-output (MIMO) wireless systems. First, in order to achieve an excellent error resilient capability, multiple bitstreams are generated based on wavelet trees along the spatial orientations. The spatial-orientation trees in the wavelet domain are individually encoded using SPIHT. Error propagation is thus limited within each bitstreams. Then, Reed-Solomon (R-S) codes as forward error correction (FEC) are adopted to combat transmission errors over error-prone wireless channels and to detect residual errors so as to avoid error propagation in each bitstream. FEC can reduce …
Unconventional Optical Imaging Using A High Speed, Neural Network Based Smart Sensor, William W. Arrasmith
Unconventional Optical Imaging Using A High Speed, Neural Network Based Smart Sensor, William W. Arrasmith
Electrical Engineering and Computer Science Faculty Publications
The advancement of neural network methods and technologies is finding applications in many fields and disciplines of interest to the defense, intelligence, and homeland security communities. Rapidly reconfigurable sensors for real or near-real time signal or image processing can be used for multi-functional purposes such as image compression, target tracking, image fusion, edge detection, thresholding, pattern recognition, and atmospheric turbulence compensation to name a few. A neural network based smart sensor is described that can accomplish these tasks individually or in combination, in real-time or near real-time. As a computationally intensive example, the case of optical imaging through volume turbulence …
A Far-Ultraviolet Study Of The Hot White Dwarf In The Dwarf Nova Ww Ceti, Patrick Godon, Laura Seward, Edward M. Sion, Paula Szkody
A Far-Ultraviolet Study Of The Hot White Dwarf In The Dwarf Nova Ww Ceti, Patrick Godon, Laura Seward, Edward M. Sion, Paula Szkody
Aerospace, Physics, and Space Science Faculty Publications
We present a synthetic spectral analysis of IUE archival and FUSE (Far Ultraviolet Spectroscopic Explorer) far-UV spectra of the peculiar dwarf nova WW Cet. During the quiescence of WW Cet, a white dwarf with T wd ∼ 26,000 ± 1000 K can account for the far-UV flux and yields the proper distance. However, the best agreement with the observations is provided by a two-temperature white dwarf model with a cooler white dwarf at T wd = 25,000 K providing 75% of the far-UV flux and a hotter region (accretion belt or optically thick disk ring) with T = 40,000 K …
Dynamic Branch&Bound, An Optimization Counterpart For Dynamic Backtracking, Marius C. Silaghi
Dynamic Branch&Bound, An Optimization Counterpart For Dynamic Backtracking, Marius C. Silaghi
Electrical Engineering and Computer Science Faculty Publications
Here we show how the idea of dynamic backtracking can be applied to branch and bound optimization. This is done by exploiting the concept of valued nogood. However, simple replacement of nogoods with valued nogoods does not lead to a correct algorithm. We show that a way to achieve correctness is to use at each variable a separate nogood storage for each position that the variable holds in the order on assigned variables. This is a different version to the one in [dago97]. Constraint Satisfaction Problems (CSPs) are typically addressed with some kind of backtracking algorithm. A seminal work that …
Classification Of Infrasound Events Using Hermite Polynomial Preprocessing And Radial Basis Function Neural Networks, Christopher G. Lowrie
Classification Of Infrasound Events Using Hermite Polynomial Preprocessing And Radial Basis Function Neural Networks, Christopher G. Lowrie
Electrical Engineering and Computer Science Faculty Publications
A method of infrasonic signal classification using hermite polynomials for signal preprocessing is presented. Infrasound is a low frequency acoustic phenomenon typically in the frequency range 0.01 Hz to 10 Hz. Data collected from infrasound sensors are preprocessed using a hermite orthogonal basis inner product approach. The hermite preprocessed signals result in feature vectors that are used as input to a parallel bank of radial basis function neural networks (RBFNN) for classification. The spread and threshold values for each of the RBFNN are then optimized. Robustness of this classification method is tested by introducing unknown events outside the training set …