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Electrical and Computer Engineering
Florida Institute of Technology
Electrical Engineering and Computer Science Faculty Publications
- Keyword
-
- Wavelet transform (15)
- Denoising (11)
- Wavelet transforms (10)
- Image processing (9)
- Algorithms (8)
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- Image fusion (8)
- Higher-order statistics (6)
- Pattern recognition (6)
- Statistical methods (6)
- Artificial neural networks (5)
- Helical Propagation (5)
- Neural networks (5)
- Wavelet (5)
- Wireless sensor networks (5)
- Clustering (4)
- Color night vision (4)
- Correlation (4)
- Feature extraction (4)
- Gaussian noise (4)
- Genetic algorithms (4)
- Helical propagation (4)
- Image database (4)
- Image reconstruction (4)
- Image transform (4)
- Multiple description coding (4)
- Multiplexing (4)
- Multiresolution (4)
- Neural network (4)
- Optical correlation (4)
- Probability (4)
Articles 31 - 60 of 262
Full-Text Articles in Engineering
Colormap Development For Night Vision From Synthetic Imagery, H. A. Qadir, Samuel Peter Kozaitis
Colormap Development For Night Vision From Synthetic Imagery, H. A. Qadir, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
We presented a method for colorizing fused imagery using a synthetic image as the color source. Imagery acquired at night from two sensors with different spectral bands were fused into a single image. We used a color transfer method based on a look-up table approach to change the false color appearance of the fused image to a natural appearance. Because the resulting multiband fused image is highly dependent on the colors is a reference image, we generated a synthetic reference image. We showed that this approach could lead to more realistic color representation for images acquired in dark environments.
Numerical Modeling Of Scattering Type Scanning Near-Field Optical Microscopy, Arvindvivek T. Ravichandran, Edward C. Kinzel, James Chris Ginn, Jeffrey A. D'Archangel, Eric Z. Tucker, Brian A. Lail, Markus B. Raschke, Glenn D. Boreman
Numerical Modeling Of Scattering Type Scanning Near-Field Optical Microscopy, Arvindvivek T. Ravichandran, Edward C. Kinzel, James Chris Ginn, Jeffrey A. D'Archangel, Eric Z. Tucker, Brian A. Lail, Markus B. Raschke, Glenn D. Boreman
Electrical Engineering and Computer Science Faculty Publications
Apertureless scattering-type Scanning Near-field Optical Microscopy (s-SNOM) has been used to study the electromagnetic response of infrared antennas below the diffraction limit. The ability to simultaneously resolve the phase and amplitude of the evanescent field relies on the implementation of several experimentally established background suppression techniques. We model the interaction of the probe with a patch antenna using the Finite Element Method (FEM). Green's theorem is used to predict the far-field, cross-polarized scattering and to construct the homodyne amplified signal. This approach allows study of important experimental phenomena, specifically the effects of the reference strength, demodulation harmonic, and detector location.
Directional Thermal Emission From A Leaky-Wave Frequency-Selective Surface, Edward C. Kinzel, James Chris Ginn, Eric Z. Tucker, Jeffrey A. D'Archangel, Louis A. Florence, Brian A. Lail, Glenn D. Boreman
Directional Thermal Emission From A Leaky-Wave Frequency-Selective Surface, Edward C. Kinzel, James Chris Ginn, Eric Z. Tucker, Jeffrey A. D'Archangel, Louis A. Florence, Brian A. Lail, Glenn D. Boreman
Electrical Engineering and Computer Science Faculty Publications
We design, fabricate, and characterize a frequency-selective surface (FSS) with directional thermal emission and absorption for long-wave infrared wavelengths. The FSS consists of an array of patch antennas connected by microstrips, the ensemble of which supports leaky-wave-type modes with forward and backward propagating branches. The branches are designed to intersect at 9.8 μm and have a broadside beam with 20-deg full width at half maximum at this wavelength. The absorption along these branches is near unity. Measurement of the hemispherical directional reflectometer shows good agreement with simulation. The ability to control the spectral and directional emittance/absorptance profiles of surfaces has …
Frequency-Selective Surface Coupled Metal-Oxide-Metal Diodes, Edward C. Kinzel, Robert Laurent Brown, James Chris Ginn, Brian A. Lail, Brian A. Slovick, Glenn D. Boreman
Frequency-Selective Surface Coupled Metal-Oxide-Metal Diodes, Edward C. Kinzel, Robert Laurent Brown, James Chris Ginn, Brian A. Lail, Brian A. Slovick, Glenn D. Boreman
Electrical Engineering and Computer Science Faculty Publications
Metal-Oxide-Metal diodes offer the possibility of directly rectifying infrared radiation. To be effective for sensing or energy harvesting they must be coupled to an antenna which produces intense fields at the diode. While antennas significantly increase the effective capture area of the MOM diode, it is still limited and maximizing the captured energy is still a challenging goal. In this work we investigate integrating MOM diodes with a slot antenna Frequency Selective Surface (FSS). This maximizes the electromagnetic capture area while minimizing the transmission line length which helps reduce losses because metal losses are much lower at DC than at …
Antenna Coupled Detectors For 2d Staring Focal Plane Arrays, Michael A. Gritz, Borys P. Kolasa, Brian A. Lail, Robert J. Burkholder, Leonard Chen
Antenna Coupled Detectors For 2d Staring Focal Plane Arrays, Michael A. Gritz, Borys P. Kolasa, Brian A. Lail, Robert J. Burkholder, Leonard Chen
Electrical Engineering and Computer Science Faculty Publications
Millimeter-wave (mmW)/sub-mmW/THz region of the electro-magnetic spectrum enables imaging thru clothing and other obscurants such as fog, clouds, smoke, sand, and dust. Therefore considerable interest exists in developing lowcost millimeter-wave imaging (MMWI) systems. Previous MMWI systems have evolved from crude mechanically scanned, single element receiver systems into very complex multiple receiver camera systems. Initial systems required many expensive mmW integrated-circuit low-noise amplifiers. In order to reduce the cost and complexity of the existing systems, attempts have been made to develop new mmW imaging sensors employing direct detection arrays. In this paper, we report on Raytheon's recent development of a unique …
Architecture Of An All Optical De-Multiplexer For Spatially Multiplexed Channels, Syed H. Murshid, Michael F. Finch, Gregory L. Lovell
Architecture Of An All Optical De-Multiplexer For Spatially Multiplexed Channels, Syed H. Murshid, Michael F. Finch, Gregory L. Lovell
Electrical Engineering and Computer Science Faculty Publications
Multiple channels of light can propagate through a multimode fiber without interfering with each other and can be independently detected at the output end of the fiber using spatial domain multiplexing (SDM). Each channel forms a separate concentric ring at the output. The typical single pin-diode structure cannot simultaneously detect and demultiplex the multiple channel propagation supported by the SDM architecture. An array of concentric circular pindiodes can be used to simultaneously detect and de-multiplex the SDM signals; however, an all optical solution is generally preferable. This paper presents simple architecture for an all optical SDM de-multiplexer.
Minimizing N-Points Interpolation Curvature, Heuristics For Solutions Using Arcs And Lines, Rahul Vishen, Marius C. Silaghi
Minimizing N-Points Interpolation Curvature, Heuristics For Solutions Using Arcs And Lines, Rahul Vishen, Marius C. Silaghi
Electrical Engineering and Computer Science Faculty Publications
Knowing a set of points on a curve, the interpolation problem is to hypothesize the location of the intermediary ones. A large set of interpolation techniques are known. We address the problem of generating a path with minimal maximum curvature, passing through N ordered points and joining the two end-points at predefined directions. This is related to R-geodesics, which have been used to generate paths with minimum average curvature between two given points that have to be joined at predefined directions and curvature. For example, when interpolating GPS points to reconstruct a vehicle’s trajectory, we may know that the centripetal …
A Neurocomputing Approach For Monitoring Plinian Volcanic Eruptions Using Infrasound, Fredric M. Ham, Ishwarya Iyengar, Bereket Mathewos Hambebo, Milton A. Garcés, John E. Deaton, Anna Bellesiles, Brian Williams
A Neurocomputing Approach For Monitoring Plinian Volcanic Eruptions Using Infrasound, Fredric M. Ham, Ishwarya Iyengar, Bereket Mathewos Hambebo, Milton A. Garcés, John E. Deaton, Anna Bellesiles, Brian Williams
Electrical Engineering and Computer Science Faculty Publications
Plinian volcanic eruptions can inject a substantial amount of volcanic ash and gas into the stratosphere, which can present a severe hazard to commercial air traffic. A hazardous volcanic ash eruption was reported on April 14, 2010, and London's aviation authority issued an alert that an ash plume was moving from an eruption in Iceland towards northwestern Europe. This eruption resulted in the closure of large areas of European airspace. Large plinian volcanic eruptions radiate infrasonic signals that can be detected by a global infrasound array network. To reduce potential hazards for commercial aviation from volcanic ash, these infrasound sensor …
Black Box Software Testing Instructor's Manual: Foundations In Software Testing, Bug Advocacy, And Test Design Courses, Rebecca L. Fiedler, Cem Kaner, Douglas Hoffman
Black Box Software Testing Instructor's Manual: Foundations In Software Testing, Bug Advocacy, And Test Design Courses, Rebecca L. Fiedler, Cem Kaner, Douglas Hoffman
Electrical Engineering and Computer Science Faculty Publications
We prepared this manual for instructors interested in using BBST materials in their own classes. It explains how to acquire your own copies of course materials; acquaints you with other resources for teaching software testing; and introduces the BBST philosophy, course model, and our pedagogical strategies. In Section One, we emphasize general skills useful for working in a fully or partially online environment. Later sections focus on how to use specific subsets of the BBST materials. Each subset is suitable for a short, professional development course. If you work in an academic environment, you can combine subsets into one or …
Mathematical Modeling And Experimental Analysis Of Multiple Channel Orbital Angular Momentum In Spatial Domain Multiplexing, Syed H. Murshid, Hari Priya Muralikrishnan, Samuel Peter Kozaitis
Mathematical Modeling And Experimental Analysis Of Multiple Channel Orbital Angular Momentum In Spatial Domain Multiplexing, Syed H. Murshid, Hari Priya Muralikrishnan, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
A novel multiplexing technique known as Spatial Domain multiplexing (SDM) has been developed in recent years and offers many advantages over its counterparts. With multiple channel transmission of the same wavelength over a single multimode carrier fiber, SDM increases the data capacity by multiple folds. Input channels are launched at appropriate input angles to produce skew ray propagation. The output of the system when projected on a screen is observed as concentric rings. These SDM beams carry orbital angular momentum. Experiments show that two input sources with the same launch conditions, but opposite topological charge take different helical paths inside …
Orbital Angular Momentum In Four Channel Spatial Domain Multiplexing System For Multi-Terabit Per Second Communication Architectures, Syed H. Murshid, Hari Priya Muralikrishnan, Samuel Peter Kozaitis
Orbital Angular Momentum In Four Channel Spatial Domain Multiplexing System For Multi-Terabit Per Second Communication Architectures, Syed H. Murshid, Hari Priya Muralikrishnan, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
Bandwidth increase has always been an important area of research in communications. A novel multiplexing technique known as Spatial Domain Multiplexing (SDM) has been developed at the Optronics Laboratory of Florida Institute of Technology to increase the bandwidth to T-bits/s range. In this technique, space inside the fiber is used effectively to transmit up to four channels of same wavelength at the same time. Experimental and theoretical analysis shows that these channels follow independent helical paths inside the fiber without interfering with each other. Multiple pigtail laser sources of exactly the same wavelength are used to launch light into a …
A Parametric Analysis Of Microbolometer Pixel Designs, Matthew J. Dumas, Brian A. Lail
A Parametric Analysis Of Microbolometer Pixel Designs, Matthew J. Dumas, Brian A. Lail
Electrical Engineering and Computer Science Faculty Publications
As microbolometer pixel dimensions for infrared imagers continue to decrease, the need for full-wave analysis in the design process is enhanced. Using reflectance as the validation point, an electromagnetic model of a dual-layer microbolometer pixel design was created for a 25 μm pixel design, and an in-depth study of the design was performed. With this model validated, further explorations were completed with a reduced size pixel. While simulating multiple variations of specific parameters, such as bridge thickness, upper and lower cavity heights, and different absorber configurations, a new evaluation metric of dissipated power in the structure was studied. This metric, …
Denoising Medical Imagery Using A Novel Framework, Samuel Peter Kozaitis, Jeetkumar M. Mehta, S. Ponkia
Denoising Medical Imagery Using A Novel Framework, Samuel Peter Kozaitis, Jeetkumar M. Mehta, S. Ponkia
Electrical Engineering and Computer Science Faculty Publications
We proposed a novel framework that allows a method optimized for white noise to be used for denoising CT imagery. We considered low-dose x-ray CT imagery where lowering the dose of x-rays results in an increase in quantum noise. We first denoised an image independently several times using different parameters. Then, we selected pixels from those denoised images to form a final composite image. We produced results using blockmatching denoising, but in principle other methods could work within this framework, as well. The proposed method was able to better reproduce regions of low-contrast than the conventional BM3D approach.
Blood Vessel Segmentation In Magnetic Resonance Angiography Imagery, Samuel Peter Kozaitis, Raghu Chandramohan
Blood Vessel Segmentation In Magnetic Resonance Angiography Imagery, Samuel Peter Kozaitis, Raghu Chandramohan
Electrical Engineering and Computer Science Faculty Publications
Small blood vessels may be difficult to detect in magnetic resonance angiography due to the lack of blood flow caused by disease or injury. Our method, which uses a block-matching denoising approach to segment blood vessels, works well in the presence of noise. We examined extended regions of an image to determine whether they contained blood vessels by fitting a Gaussian mixture model to a region's histogram. Then, dissimilar regions were denoised separately. This approach was beneficial in low-contrast settings. It can be used to detect higher-order blood vessels that may be difficult to detect under normal conditions.
Attenuation And Bit Error Rate For Four Co-Propagating Spatially Multiplexed Optical Communication Channels Of Exactly Same Wavelength In Step Index Multimode Fibers, Syed H. Murshid, Abhijit Chakravarty
Attenuation And Bit Error Rate For Four Co-Propagating Spatially Multiplexed Optical Communication Channels Of Exactly Same Wavelength In Step Index Multimode Fibers, Syed H. Murshid, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Spatial domain multiplexing (SDM) utilizes co-propagation of exactly the same wavelength in optical fibers to increase the bandwidth by integer multiples. Input signals from multiple independent single mode pigtail laser sources are launched at different input angles into a single multimode carrier fiber. The SDM channels follow helical paths and traverse through the carrier fiber without interfering with each other. The optical energy from the different sources is spatially distributed and takes the form of concentric circular donut shaped rings, where each ring corresponds to an independent laser source. At the output end of the fiber these donut shaped independent …
Free-Space Optical Communication Link Using Spatial Optical Encryption, Syed H. Murshid, William B. Howard, Abhijit Chakravarty
Free-Space Optical Communication Link Using Spatial Optical Encryption, Syed H. Murshid, William B. Howard, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Free-space optical links are ideal for short-range (1 km to 3 km) communications. An innovative new technique called Spatial Optical Encryption can be used to secure laser data communications. With this technique, data can be encoded and transmitted spatially through a single fiber, and then transmitted over a free-space optical link. Different sources of data could be simultaneously sent over the same fiber. This endeavor demonstrates the design and performance issues of such a transmitter and receiver using Spatial Optical Encryption over an environmental link of 100 meters.
Optical Encryption As A Function Of Polarization In Optical Fiber Communications, Syed H. Murshid, Hari Priya Muralikrishnan, Jayachandran Tamilarasan, Abhijit Chakravarty, John H. Caulfield
Optical Encryption As A Function Of Polarization In Optical Fiber Communications, Syed H. Murshid, Hari Priya Muralikrishnan, Jayachandran Tamilarasan, Abhijit Chakravarty, John H. Caulfield
Electrical Engineering and Computer Science Faculty Publications
An optical encryption technique based on polarization property of light is proposed. Many techniques using polarization beam splitters to encrypt the signal have been proposed earlier. They are based on splitting and interference of two light signals, namely message and noise. Only by placing suitable mirrors and a second beam splitter in a suitable position, the two signals are reconstructed at the output. In this paper we report the fiber optic version of a polarization based encryption technique that also has the potential to double the data carrying capacity of the fiber. Using polarization dependent couplers in the fiber optic …
Enhanced Ulf Radiation Observed By Demeter Two Months Around The Strong 2010 Haiti Earthquake, M. A. Athanasiou, Georgios C. Anagnostopoulos, A. C. Iliopoulos, G. P. Pavlos, C. N. David
Enhanced Ulf Radiation Observed By Demeter Two Months Around The Strong 2010 Haiti Earthquake, M. A. Athanasiou, Georgios C. Anagnostopoulos, A. C. Iliopoulos, G. P. Pavlos, C. N. David
Electrical Engineering and Computer Science Faculty Publications
In this paper we study the energy of ULF electromagnetic waves that were recorded by the satellite DEMETER, during its passing over Haiti before and after a destructive earthquake. This earthquake occurred on 12 January 2010, at geographic Latitude 18.46° and Longitude 287.47°, with Magnitude 7.0 R. Specifically, we are focusing on the variations of energy of Ez-electric field component concerning a time period of 100 days before and 50 days after the strong earthquake. In order to study these variations, we have developed a novel method that can be divided in two stages: first we filter the signal, keeping …
Cad Simulated And Experimental Beam Profile Analysis Of Single-Mode Tapered Fibers For Optical Bandwidth Enhancement Applications, Syed H. Murshid, Raka Biswas, Abhijit Chakravarty
Cad Simulated And Experimental Beam Profile Analysis Of Single-Mode Tapered Fibers For Optical Bandwidth Enhancement Applications, Syed H. Murshid, Raka Biswas, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Most developments in data transfer techniques are incremental by nature and the goal of increasing total capacity in optical communications and networking requires new concepts for basic transmission media. The transmission data rates can only be enhanced by introducing new modulation and multiplexing techniques. In this paper different single mode tapered fiber waveguides are used to design a Spatial Multiplexer Unit (SMU) for a novel optical fiber multiplexing technique called the Spatial Domain Multiplexing (SDM) that allows co-propagation of two or more channels of exactly same wavelength without interfering with each other. This paper also presents a CAD model for …
Novel Wavelength Diversity Technique For High-Speed Atmospheric Turbulence Compensation, William W. Arrasmith, Sean F. Sullivan
Novel Wavelength Diversity Technique For High-Speed Atmospheric Turbulence Compensation, William W. Arrasmith, Sean F. Sullivan
Electrical Engineering and Computer Science Faculty Publications
The defense, intelligence, and homeland security communities are driving a need for software dominant, real-time or near-real time atmospheric turbulence compensated imagery. The development of parallel processing capabilities are finding application in diverse areas including image processing, target tracking, pattern recognition, and image fusion to name a few. A novel approach to the computationally intensive case of software dominant optical and near infrared imaging through atmospheric turbulence is addressed in this paper. Previously, the somewhat conventional wavelength diversity method has been used to compensate for atmospheric turbulence with great success. We apply a new correlation based approach to the wavelength …
Sdm Propagation Model For Multiple Channels Using Ray Theory, Syed H. Murshid, Ebad Zahir, Abhijit Chakravarty
Sdm Propagation Model For Multiple Channels Using Ray Theory, Syed H. Murshid, Ebad Zahir, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Spatial Domain Multiplexing (SDM) is a novel optical fiber multiplexing technique where multiple channels of the same wavelength are launched at specific angles inside a standard step index multimode carrier fiber. These channels are confined to specific locations inside the fiber and they do not interfere with each other while traversing the length of the fiber. Spatial filtering techniques are employed at the output end to separate, route and process the individual channels. These skew ray channels inside the SDM system follow a helical trajectory along the fiber. The screen projection of the skew rays resembles a circular polygon. A …
Denoising Of X-Ray Imagery With Spatially-Varying Estimates Of Noise Variance, Samuel Peter Kozaitis
Denoising Of X-Ray Imagery With Spatially-Varying Estimates Of Noise Variance, Samuel Peter Kozaitis
Electrical Engineering and Computer Science Faculty Publications
We described a way to use a block-matching 3-D denoising algorithm to reduce noise in x-ray imagery. We first filtered an image multiple times using different estimates of the noise variance. From a simple estimate of the denoised image, we then estimated the noise variance at each pixel of the image. Using this approach, we obtained improved results when compared to using a single value of estimate for the noise variance. Even a small number of quantization levels of the estimates of the noise showed improved results.
Sdm Propagation Model For Multiple Channels Using Electromagnetic Theory And Vortex Analysis, Syed H. Murshid, Ebad Zahir, Raka Biswas, Abhijit Chakravarty
Sdm Propagation Model For Multiple Channels Using Electromagnetic Theory And Vortex Analysis, Syed H. Murshid, Ebad Zahir, Raka Biswas, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Spatial Domain Multiplexing (SDM) is a novel technique in optical fiber communications. Single mode fibers are used to launch Gaussian beams of the same wavelength into a multimode step index fiber at specific angles. Based on the launch angle, the channel follows a helical path. The helical trajectory is explained with the help of vortex theory. The electromagnetic wave based vortex formation and propagation is mathematically modeled for multiple channels and the results are compared against experimental and simulated data. The modeled output intensity is analyzed to show a relationship between launch angle and the electric field intensity.
Comparison Of Experimental And Mathematical Models Of Attenuation And Dispersion For Co-Propagating Helical Channels Of Same Wavelength In Optical Fibers, Syed H. Murshid, Abhijit Chakravarty
Comparison Of Experimental And Mathematical Models Of Attenuation And Dispersion For Co-Propagating Helical Channels Of Same Wavelength In Optical Fibers, Syed H. Murshid, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Spatial reuse of optical frequencies in optical fibers is possible through a novel Spatial Domain Multiplexing (SDM) technique that enables simultaneous propagation of two or more spatially multiplexed channels of exactly the same wavelength by confining them to unique spatial locations inside the fiber. Spatial filtering techniques are employed at the output end to separate the individual optical channels. The SDM channels follow helical path inside the carrier fiber and do not interfere with each other. This paper presents electromagnetic wave based model to analyze two such co-propagating SDM channels and then compares the model predictions to experimental data. The …
A Crisis Management Approach To Mission Survivability In Computational Multi-Agent Systems, Marco Carvalho, Aleksander Byrski, Marek Kisiel-Dorohinicki
A Crisis Management Approach To Mission Survivability In Computational Multi-Agent Systems, Marco Carvalho, Aleksander Byrski, Marek Kisiel-Dorohinicki
Electrical Engineering and Computer Science Faculty Publications
In this paper we present a biologically-inspired approach for mission survivability (consideredas the capability of fulfilling a task such as computation) that allows the system to be aware ofthe possible threats or crises that may arise. This approach uses the notion of resources usedby living organisms to control their populations.We present the concept of energetic selectionin agent-based evolutionary systems as well as the means to manipulate the configuration ofthe computation according to the crises or user’s specific demands.
Cad Model For Co-Propagating Spatially Multiplexed Channels Of Same Wavelength Over Standard Multimode Fibers, Syed H. Murshid, Raka Biswas, Abhijit Chakravarty
Cad Model For Co-Propagating Spatially Multiplexed Channels Of Same Wavelength Over Standard Multimode Fibers, Syed H. Murshid, Raka Biswas, Abhijit Chakravarty
Electrical Engineering and Computer Science Faculty Publications
Spatial Domain Multiplexing (SDM) is a novel technique that allows co-propagation of two or more optical communication channels of the same wavelengths over a single strand of optical fiber cable by maintaining spatial separation between the channels. Spatial multiplexer known as the beam combiner module (BCM) supports helical propagation of light to ensure spatial separation between the channels. It is inserted at the input end of the system. Spatial de-multiplexing is achieved by a unit named beam separator module (BSM). This unit is inserted at the receiving end of the system and it routes the optical energy from individual channels …
Denoising Using Adaptive Thresholding And Higher Order Statistics, Samuel Peter Kozaitis, Tim Young
Denoising Using Adaptive Thresholding And Higher Order Statistics, Samuel Peter Kozaitis, Tim Young
Electrical Engineering and Computer Science Faculty Publications
We showed that a hard threshold for wavelet denoising based on higher order statistics is comparable to a second order soft threshold. The hard threshold can be made adaptive by using a third order statistic as an estimate of the noise. In addition, the relationship between an adaptive hard threshold and retaining a fraction of wavelet coefficients is shown. Qualitative and quantitative metrics based on the mean-squared error are used to compare the hard thresholding and a soft-thresholding technique, BayesShrink.
The Peer-Reviewing Game, Marius C. Silaghi, Makoto Yokoo
The Peer-Reviewing Game, Marius C. Silaghi, Makoto Yokoo
Electrical Engineering and Computer Science Faculty Publications
We model a family of peer-reviewing processes as game-theoretic problems. The model helps to understand elements of existing peer-reviewing procedures, and to predict the impact of new mechanisms. The peer-reviewing for evaluation of scientific results submitted to conferences involves complex decision processes of independent participants. Significant tax-payer money is spent by governments for the advancement of science, and such governmental decisions are often based on outcomes of peer-reviewing in scientific conferences. Here we propose to analyze and design improved mechanisms for conference peer-reviewing, based on game-theoretic approaches. Real world conference peer-reviewing processes are overly complex and here we define and …
Chain-Type Wireless Sensor Network For Monitoring Long Range Infrastructures: Architecture And Protocols, Chang Wen Chen, Yu Wang
Chain-Type Wireless Sensor Network For Monitoring Long Range Infrastructures: Architecture And Protocols, Chang Wen Chen, Yu Wang
Electrical Engineering and Computer Science Faculty Publications
We present in this paper an investigation of a special class of wireless sensor networks for monitoring critical infrastructures that may extend for hundreds of miles in distances. Such networks are fundamentally different from traditional sensor networks in that the sensor nodes in this class of networks are deployed along narrowly elongated geographical areas and form a chain-type topology. Based on careful analysis of existing sensor network architectures, we first demonstrate the need to develop new architecture and networking protocols to match the unique topology of chain-type sensor networks. We then propose hierarchical network architecture that consists of clusters of …
Parallel Implementation Of High-Speed, Phase Diverse Atmospheric Turbulence Compensation Method On A Neural Network-Based Architecture, William W. Arrasmith, Sean F. Sullivan
Parallel Implementation Of High-Speed, Phase Diverse Atmospheric Turbulence Compensation Method On A Neural Network-Based Architecture, William W. Arrasmith, Sean F. Sullivan
Electrical Engineering and Computer Science Faculty Publications
Phase diversity imaging methods work well in removing atmospheric turbulence and some system effects from predominantly near-field imaging systems. However, phase diversity approaches can be computationally intensive and slow. We present a recently adapted, high-speed phase diversity method using a conventional, software-based neural network paradigm. This phase-diversity method has the advantage of eliminating many time consuming, computationally heavy calculations and directly estimates the optical transfer function from the entrance pupil phases or phase differences. Additionally, this method is more accurate than conventional Zernike-based, phase diversity approaches and lends itself to implementation on parallel software or hardware architectures. We use computer …