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Engineering Commons™

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Electrical and Computer Engineering

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Florida Institute of Technology

2008

Articles 1 - 12 of 12

Full-Text Articles in Engineering

The Peer-Reviewing Game, Marius C. Silaghi, Makoto Yokoo Nov 2008

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 …

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Chain-Type Wireless Sensor Network For Monitoring Long Range Infrastructures: Architecture And Protocols, Chang Wen Chen, Yu Wang Oct 2008

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 …

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Parallel Implementation Of High-Speed, Phase Diverse Atmospheric Turbulence Compensation Method On A Neural Network-Based Architecture, William W. Arrasmith, Sean F. Sullivan Apr 2008

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 …

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Subsidence Measurement And Dsm Extraction Of Ifsar Data Using Anisotropic Diffusion And Wavelet Denoising Filters, Kenneth Sartor, Josef De Vaughn Allen, Emile Ganthier, Mark Rahmes, Gnana Bhaskar Tenali, Samuel Peter Kozaitis Apr 2008

Subsidence Measurement And Dsm Extraction Of Ifsar Data Using Anisotropic Diffusion And Wavelet Denoising Filters, Kenneth Sartor, Josef De Vaughn Allen, Emile Ganthier, Mark Rahmes, Gnana Bhaskar Tenali, Samuel Peter Kozaitis

Electrical Engineering and Computer Science Faculty Publications

The most commonly used smoothing algorithms for complex data processing are low pass filters. Unfortunately, an undesired side effect of the aforementioned techniques is the blurring of scene discontinuities in the interferogram. For Digital Surface Map (DSM) extraction and subsidence measurement, the smoothing of the scene discontinuities can cause inaccuracy in the final product. Our goal is to perform spatially non-uniform smoothing to overcome the aforementioned disadvantages. We achieve this by using an Anisotropic Non-Linear Diffuser (ANDI). Here, in this paper we will show the utility of ANDI filtering on simulated and actual Interferometric Synthetic Aperture Radar (IFSAR) data for …

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Shape-Based Recognition Of Targets In Synthetic Aperture Radar Images Using Elliptical Fourier Descriptors, Louis P. Nicoli, Georgios C. Anagnostopoulos Apr 2008

Shape-Based Recognition Of Targets In Synthetic Aperture Radar Images Using Elliptical Fourier Descriptors, Louis P. Nicoli, Georgios C. Anagnostopoulos

Electrical Engineering and Computer Science Faculty Publications

This paper primarily investigates the use of shape-based features by an Automatic Target Recognition (ATR) system to classify various types of targets in Synthetic Aperture Radar (SAR) images. In specific, shapes of target outlines are represented via Elliptical Fourier Descriptors (EFDs), which, in turn, are utilized as recognition features. According to the proposed ATR approach, a segmentation stage first isolates the target region from shadow and ground clutter via a sequence of fast thresholding and morphological operations. Next, a number of EFDs are computed that can sufficiently describe the salient characteristics of the target outline. Finally, a classification stage based …

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Thresholding For Higher-Order Statistical Denoising, Samuel Peter Kozaitis, Tim Young Apr 2008

Thresholding For Higher-Order Statistical Denoising, Samuel Peter Kozaitis, Tim Young

Electrical Engineering and Computer Science Faculty Publications

Hard thresholding seems to work well for denoising signals using higher-order statistics. We statistically examined the best values for hard thresholding and related this to the fraction of wavelet coefficients set to zero to obtain the minimum MSE. In addition, we found that the minimum MSE obtained was less sensitive to the threshold when implemented based on a third-order parameter rather than the noise power. Alternatively, we found that this approach to thresholding could be implemented by setting a fixed fraction of wavelet coefficients to zero.

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Idma: Improving The Defense Against Malicious Attack For Mobile Ad Hoc Networks Based On The Artp Protocol, Chaorong Peng, Chang Wen Chen Apr 2008

Idma: Improving The Defense Against Malicious Attack For Mobile Ad Hoc Networks Based On The Artp Protocol, Chaorong Peng, Chang Wen Chen

Electrical Engineering and Computer Science Faculty Publications

Malicious nodes are mounting increasingly sophisticated attacking operations on the Mobile Ad Hoc Networks (MANETs). This is mainly because the IP-based MANETs are vulnerable to attacks by various malicious nodes. However, the defense against malicious attack can be improved when a new layer of network architecture can be developed to separate true IP address from disclosing to the malicious nodes. In this paper, we propose a new algorithm to improve the defense against malicious attack (IDMA) that is based on a recently developed Assignment Router Identify Protocol (ARIP) for the clustering-based MANET management. In the ARIP protocol, we design the …

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Performance Study Of Mpls And Ds Techniques To Improve Qos Routing For Critical Applications On Ip Networks, Salim Alsharif, Mohammad Mehdi Shahsavari Apr 2008

Performance Study Of Mpls And Ds Techniques To Improve Qos Routing For Critical Applications On Ip Networks, Salim Alsharif, Mohammad Mehdi Shahsavari

Electrical Engineering and Computer Science Faculty Publications

This paper aims to analyze the QoS performance of two main technology mechanisms, Multi-Protocol Label Switching (MPLS) and Differentiated Services (DS). The introduction of both mechanisms to support throughput and delay sensitive real-time media traffic will have an impact on critical applications with respect to QoS and traffic engineering. MPLS is a traffic forwarding mechanism that allows traffic to use multiple paths and DS is a mechanism that provides for aggregate traffic to be classified and conditioned at the edge of the network routers. The two modeled techniques and their performance will be evaluated with respect to their end-to-end delay. …

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Direct, Object Brightness Estimation From Atmospheric Turbulence Degraded Images Using A New, High-Speed, Modified Phase Diversity Method, William W. Arrasmith Mar 2008

Direct, Object Brightness Estimation From Atmospheric Turbulence Degraded Images Using A New, High-Speed, Modified Phase Diversity Method, William W. Arrasmith

Electrical Engineering and Computer Science Faculty Publications

The well known phase diversity technique has long been used as a premier passive imaging method to mitigate the degrading effects of atmospheric turbulence on incoherent optical imagery. Typically, an iterative, slow method is applied that uses the Zernike basis set and 2-D Fourier transforms in the reconstruction process. In this paper, we demonstrate a direct method for estimating the un-aberrated object brightness from phase or phase difference estimates that 1) does not require the use of the Zernike basis set or the intermediate determination of the generalized pupil function, 2) directly determines the optical transfer function without the requirement …

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Securing Manets With Bitsi: Danger Theory And Mission Continuity, Marco Carvalho, Richard A. Ford, William H. Allen, Gerald A. Marin Mar 2008

Securing Manets With Bitsi: Danger Theory And Mission Continuity, Marco Carvalho, Richard A. Ford, William H. Allen, Gerald A. Marin

Electrical Engineering and Computer Science Faculty Publications

MANET (Mobile Ad hoc Network) environments are becoming increasingly important as potential users recognize the benefits of being able to create a functional network using little or no fixed infrastructure. Unfortunately, the very properties that provide such flexibility also cause significant complications in terms of security. The collaborative nature of the system combined with its continual state of flux requires solutions that are highly dynamic, and that can adapt to massive changes in system resources, traffic patterns and network topology. In this paper, we outline a new approach to MANET security called BITSI (the Biologically-Inspired Tactical Security Infrastructure). BITSI is …

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Porous Silicon Surface Feature Size Estimation Using The Reflectance Spectrum, Christopher G. Lowrie, Susan K. Earles, Maria E. Pozo De Fernandez Feb 2008

Porous Silicon Surface Feature Size Estimation Using The Reflectance Spectrum, Christopher G. Lowrie, Susan K. Earles, Maria E. Pozo De Fernandez

Electrical Engineering and Computer Science Faculty Publications

In this paper we excite the surface of porous silicon with incoherent, broad band white light and observe the spectrum of colors reflected from the surface. Using an atomic force microscope images from red and green porous silicon samples are collected. In this paper we relate the optical color of the surface to the size of scattering features on the textured surface. From image segmentation using the watershed transform the height distributions of the optical scattering features are determined. The heights of these surface features are then used as input variables to a computer simulation of a reflective grating. The …

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Hydrogen Sensor Using Optical Reflectance From Porous Silicon With A Palladium Thin Film, Christopher G. Lowrie, Susan K. Earles, Maria E. Pozo De Fernandez Feb 2008

Hydrogen Sensor Using Optical Reflectance From Porous Silicon With A Palladium Thin Film, Christopher G. Lowrie, Susan K. Earles, Maria E. Pozo De Fernandez

Electrical Engineering and Computer Science Faculty Publications

Results of a hydrogen sensor based on light scattering from a porous silicon surface coated with a thin palladium film are discussed. Reflected light scattered from the rough surface of porous silicon surface with a thin palladium film is compared before and after exposure to hydrogen gas. After exposure to hydrogen gas the sensor's optical reflectance is decreased indicating the presence of hydrogen.

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