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Articles 11251 - 11280 of 21803

Full-Text Articles in Engineering

Bist Design For Ccd Based Digital Imaging System, Bin Jin, Nohpill Park, Serge N. Demidenko, Minsu Choi, Fabrizio Lombardi May 2007

Bist Design For Ccd Based Digital Imaging System, Bin Jin, Nohpill Park, Serge N. Demidenko, Minsu Choi, Fabrizio Lombardi

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a BIST design for CCD-based digital imaging system. Pixels on a CCD are not free from defective or faulty pixels due to numerous causes such as imperfect fabrication, excessive exposure to light, radiation, sensing element aging, and excessive mechanical shock, to mention a few. Today's high demand for high resolution CCDs is dictating defect/fault-tolerance in such devices. Especially, traditional on-device BIST cannot be readily employed on the imaging devices such as CCD due to the unique requirement that no pixel can be utilized to repair or bypass a defect on any other pixels. Therefore, the BIST technique …

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Raman Spectroscopy Of The Human Nail: A Potential Tool For Evaluating Bone Health?, Mark R. Towler, A. Wren, N. Rushe, J. Saunders, N. M. Cummins, P. M. Jakeman May 2007

Raman Spectroscopy Of The Human Nail: A Potential Tool For Evaluating Bone Health?, Mark R. Towler, A. Wren, N. Rushe, J. Saunders, N. M. Cummins, P. M. Jakeman

Chemical and Biochemical Engineering Faculty Research & Creative Works

Dual X-ray absorptiometry (DEXA) is the current gold standard for the diagnosis of osteoporosis. However, patients can suffer osteoporotic fractures despite normal bone mineral density, partly because of unmeasured influences of both the protein and mineral phases of bone that are affected in osteoporosis. There is currently no clinically applicable method of evaluating the health of the protein phase. The proteins in human nail (keratin) and bone (collagen) require sulphation and disulphide bond (S-S) formation for structural integrity and disorders of either sulphur metabolism or cystathione beta-synthase can lead to structural abnormalities in these tissues. Raman protein spectra provide a …

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Management Of An Intelligent Argumentation Network For A Web-Based Collaborative Engineering Design Environment, Xiaoqing Frank Liu, Man Zheng, Ganesh K. Venayagamoorthy, Ming-Chuan Leu May 2007

Management Of An Intelligent Argumentation Network For A Web-Based Collaborative Engineering Design Environment, Xiaoqing Frank Liu, Man Zheng, Ganesh K. Venayagamoorthy, Ming-Chuan Leu

Computer Science Faculty Research & Creative Works

Conflict resolution is one of the most challenging tasks in collaborative engineering design. In our previous research, a web-based intelligent collaborative system was developed to address this challenge based on intelligent computational argumentation. However, two important issues were not resolved in that system: priority of participants and self-conflicting arguments. In this paper, we develop two methods for incorporating priorities of participants into the computational argumentation network: 1) weighted summation and 2) re-assessment of strengths of arguments based on priority of owners of the argument using fuzzy logic inference. In addition, we develop a method for detection of self-conflicting arguments. Incorporation …

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Commensurate Phases Of Gases Adsorbed On Carbon Nanotubes, Angela D. Lueking, W. Milton Cole May 2007

Commensurate Phases Of Gases Adsorbed On Carbon Nanotubes, Angela D. Lueking, W. Milton Cole

Chemical and Biochemical Engineering Faculty Research & Creative Works

A study is presented of the nature of ordered phases of various gases adsorbed on an isolated carbon nanotube. Because the spacing between neighboring adsorption sites depends on the tube's radius R, the equilibrium structure of the ground state is predicted to differ from that observed on planar graphite. Results for this structure are presented for the inert gases and hydrogen as a function of R for zigzag nanotubes.

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A Novel Cylindrical Punch Method To Characterize Interfacial Adhesion And Residual Stress Of A Thin Polymer Film, Bing Feng Ju, Kuo Kang Liu, Ming Fung Wong, Kai Tak Wan May 2007

A Novel Cylindrical Punch Method To Characterize Interfacial Adhesion And Residual Stress Of A Thin Polymer Film, Bing Feng Ju, Kuo Kang Liu, Ming Fung Wong, Kai Tak Wan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Adhesion of a pre-stressed silicone rubber film to a planar graphite surface was investigated by a new cylindrical punch method. a homemade apparatus was constructed to meet force and displacement resolutions of 0.1 μN and 10 nm. When the punch approached the intersurface force range across the punch-film gap, the film jumped into contact at "pull-in". Upon unloading, once the tensile load reached a threshold, a spontaneous delamination occurred at "pull-off" with a non-zero contact circle. a theoretical model was constructed based a simple energy balance. the new method can be used to characterize an adhesion interface between a pre-stressed …

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Accurate Macro-Modeling For Leakage Current For IDdq Test, Kyung Ki Kim, Yong-Bin Kim, Minsu Choi, Nohpill Park May 2007

Accurate Macro-Modeling For Leakage Current For IDdq Test, Kyung Ki Kim, Yong-Bin Kim, Minsu Choi, Nohpill Park

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a new precise macro-modeling for leakage current in BSIM4 65nm technology considering subthreshold leakage, gate tunneling leakage, stack effect, and fanout effect. Using the accurate macro-model, a heuristic algorithm is developed to estimate the leakage power and generate input test pattern for minimum leakage. The algorithm applies to ISCAS85 benchmark circuits, and the results are compared with the results of Hspice. The experimental result shows that the leakage power estimation using our macro-model is within 5% difference when comparing to Hspice results.

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High Resolution Millimeter Wave Inspecting Of The Orbiter Acreage Heat Tiles Of The Space Shuttle, Joseph Toby Case, Sergey Kharkovsky, R. Zoughi, Frank L. Hepburn May 2007

High Resolution Millimeter Wave Inspecting Of The Orbiter Acreage Heat Tiles Of The Space Shuttle, Joseph Toby Case, Sergey Kharkovsky, R. Zoughi, Frank L. Hepburn

Electrical and Computer Engineering Faculty Research & Creative Works

The physical cause of Space Shuttle Columbia's catastrophic failure was a breach in its thermal protection system, caused by a piece of external tank insulating foam (SOFI) separating from the external tank and striking the leading edge of the left wing of the orbiter. Consequently, there is an urgent need for a rapid, robust and life-circle oriented nondestructive testing (NDT) technique capable of inspecting the SOFI as well as the orbiter's protective heat tiles and its fuselage prior and subsequent to a launch. Microwave and millimeter wave NDT methods have shown great potential to achieve these goals using real focused …

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Impedance Identification Of Integrated Power System Components Using Recurrent Neural Networks., Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine May 2007

Impedance Identification Of Integrated Power System Components Using Recurrent Neural Networks., Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine

Electrical and Computer Engineering Faculty Research & Creative Works

Impedance characteristics of shipboard power systems provide important information for studies on system stability and integration. Existing injection based impedance measurement techniques require multiple tests on the system to obtain characteristics over wide frequency ranges. In this paper, recurrent neural networks (RNNs) are used to model the small signal dynamics of power electronic systems based on a single test in which randomized signals are injected into the system. The trained RNN is then used to extract the small-signal impedances/admittances of the system. A number of tests have been carried out in simulation to verify the effectiveness of the proposed method.

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Single-Phase Ac Impedance Modeling For Stability Of Integrated Power Systems, Jing Huang, Keith Corzine, M. Belkhayat May 2007

Single-Phase Ac Impedance Modeling For Stability Of Integrated Power Systems, Jing Huang, Keith Corzine, M. Belkhayat

Electrical and Computer Engineering Faculty Research & Creative Works

To date, the only power system stability requirement that can be decomposed or quantitatively "flowed" down to component design requirements are impedance based. Impedance based requirements have been advanced for both dc and three-phase ac but none for single-phase ac interfaces. What are ultimately needed are universal stability requirements that are applicable to dc, single-phase ac, and three-phase ac interfaces as well as a measurement tool which can be used to enforce the requirements at all interfaces without changing the fundamental structure of the impedance measurement device. These advanced techniques should be applicable to all voltage levels currently in use …

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The Use Of Accelerated Full-Wave Modeling To Analyze Power Island Coupling In A Hyperbga Scm, Jason Morsey, Alina Deutsch, J. P. Libous, C. Surovic, Barry J. Rubin, Lijun Jiang, L. Eisenberg May 2007

The Use Of Accelerated Full-Wave Modeling To Analyze Power Island Coupling In A Hyperbga Scm, Jason Morsey, Alina Deutsch, J. P. Libous, C. Surovic, Barry J. Rubin, Lijun Jiang, L. Eisenberg

Electrical and Computer Engineering Faculty Research & Creative Works

Presented here are results and recommendations for reducing coupling between adjacent power islands based on full-wave simulations of a HyperBGA SCM (single-chip module). These simulations highlight the use of IBM's internally developed accelerated full-wave solver based on the precorrected fast Fourier transform approach. Speedups of 100 x and memory reductions of 12 x are shown for real engineering problems, as compared to direct integral equation solutions. © 2007 IEEE.

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On The Formation And Propagation Of Nonlinear Internal Boluses Across A Shelf Break, Subhas K. Venayagamoorthy, Oliver B. Fringer Apr 2007

On The Formation And Propagation Of Nonlinear Internal Boluses Across A Shelf Break, Subhas K. Venayagamoorthy, Oliver B. Fringer

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

High-resolution two- and three-dimensional numerical simulations are performed of first-mode internal gravity waves interacting with a shelf break in a linearly stratified fluid. The interaction of nonlinear incident waves with the shelf break results in the formation of upslope-surging vortex cores of dense fluid (referred to here as internal boluses) that propagate onto the shelf. This paper primarily focuses on understanding the dynamics of the interaction process with particular emphasis on the formation, structure and propagation of internal boluses on shelf. A possible mechanism is identified for the excitation of vortex cores that are lifted over the shelf break, from …

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Coupled-Mode Theory For Stimulated Raman Scattering In High-Q/Vm Silicon Photonic Band Gap Defect Cavity Lasers, Xiaodong Yang, C. W. Wong Apr 2007

Coupled-Mode Theory For Stimulated Raman Scattering In High-Q/Vm Silicon Photonic Band Gap Defect Cavity Lasers, Xiaodong Yang, C. W. Wong

Mechanical and Aerospace Engineering Faculty Research & Creative Works

We examine the dynamics of stimulated Raman scattering in designed high-Q/Vm silicon photonic band gap nanocavities through the coupled-mode theory framework towards optically-pumped silicon lasing. The interplay of other X(3) effects such as two-photon absorption and optical Kerr, related free-carrier dynamics, thermal effects, as well as linear losses such as cavity radiation and linear material absorption are included and investigated numerically. Our results clarify the relative contributions and evolution of the mechanisms, and demonstrate the lasing and shutdown thresholds. Our studies illustrate the conditions for continuous-wave and pulsed highly-efficient Raman frequency conversion for practical realization in monolithic silicon …

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Short-Term Stock Market Timing Prediction Under Reinforcement Learning Schemes, Hailin Li, Cihan H. Dagli, David Lee Enke Apr 2007

Short-Term Stock Market Timing Prediction Under Reinforcement Learning Schemes, Hailin Li, Cihan H. Dagli, David Lee Enke

Engineering Management and Systems Engineering Faculty Research & Creative Works

There are fundamental difficulties when only using a supervised learning philosophy to predict financial stock short-term movements. We present a reinforcement-oriented forecasting framework in which the solution is converted from a typical error-based learning approach to a goal-directed match-based learning method. The real market timing ability in forecasting is addressed as well as traditional goodness-of-fit-based criteria. We develop two applicable hybrid prediction systems by adopting actor-only and actor-critic reinforcement learning, respectively, and compare them to both a supervised-only model and a classical random walk benchmark in forecasting three daily-based stock indices series within a 21-year learning and testing period. The …

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Implementation Of Static And Semi-Static Versions Of A 24+8x8 Quad-Rail Null Convention Multiply And Accumulate Unit, R. Sankar, V. Kadiyala, S. Kumar, S. Mohan, F. Kacani, Waleed K. Al-Assadi, Scott C. Smith, Ravi Bonam Apr 2007

Implementation Of Static And Semi-Static Versions Of A 24+8x8 Quad-Rail Null Convention Multiply And Accumulate Unit, R. Sankar, V. Kadiyala, S. Kumar, S. Mohan, F. Kacani, Waleed K. Al-Assadi, Scott C. Smith, Ravi Bonam

Electrical and Computer Engineering Faculty Research & Creative Works

This paper focuses on implementing a 2s complement 8x8 dual-rail bit-wise pipelined multiplier using the asynchronous null convention logic (NCL) paradigm. The design utilizes a Wallace tree for partial product summation, and is implemented and simulated in VHDL, the transistor level, and the physical level, using a 1.8V 0.18mum TSMC CMOS process. The multiplier is realized using both static and semi-static versions of the NCL gates; and these two implementations are compared in terms of area, power, and speed.

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Ncl Implementation Of Dual-Rail 2S Complement 8x8 Booth2 Multiplier Using Static And Semi-Static Primitives, Mandar V. Joshi, Sagar R. Gosavi, V. Jegadeesan, A. Basu, S. Jaiswal, Waleed K. Al-Assadi, Scott C. Smith Apr 2007

Ncl Implementation Of Dual-Rail 2S Complement 8x8 Booth2 Multiplier Using Static And Semi-Static Primitives, Mandar V. Joshi, Sagar R. Gosavi, V. Jegadeesan, A. Basu, S. Jaiswal, Waleed K. Al-Assadi, Scott C. Smith

Electrical and Computer Engineering Faculty Research & Creative Works

In this work, we use static and semi-static versions of NULL Convention Logic (NCL) primitives (i.e., threshold gates) to implement a dual-rail 8times8 2s complement multiplier using the Modified Booth2 algorithm for partial product generation and a Wallace tree for partial product summation. We establish the multiplier's functionality utilizing VHDL-based simulations of the gate-level structural design. The design is then implemented at the transistor-level and layout-level using both static and semi-static threshold gates, for a 1.8V 0.18mum TSMC CMOS process; and these two implementations are compared in terms of area, power, and speed.

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Efficient Sampling For Non-Intrusive Polynomial Chaos Applications With Multiple Uncertain Input Variables, Serhat Hosder, Robert W. Walters, Michael Balch Apr 2007

Efficient Sampling For Non-Intrusive Polynomial Chaos Applications With Multiple Uncertain Input Variables, Serhat Hosder, Robert W. Walters, Michael Balch

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The accuracy and the computational efficiency of a Point-Collocation Non-Intrusive Polynomial Chaos (NIPC) method applied to stochastic problems with multiple uncertain input variables has been investigated. Two stochastic model problems with multiple uniform random variables were studied to determine the effect of different sampling methods (Random, Latin Hypercube, and Hammersley) for the selection of the collocation points. The effect of the number of collocation points on the accuracy of polynomial chaos expansions were also investigated. The results of the stochastic model problems show that all three sampling methods exhibit a similar performance in terms of the the accuracy and the …

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A Framework For The Detection Of Crosstalk Noise In Fpgas, Sindhu Kakarla, Waleed K. Al-Assadi Apr 2007

A Framework For The Detection Of Crosstalk Noise In Fpgas, Sindhu Kakarla, Waleed K. Al-Assadi

Electrical and Computer Engineering Faculty Research & Creative Works

In recent years, crosstalk noise has emerged a serious problem because more and more devices and wires have been packed on electronic chips. As integrated circuits are migrated to more advanced technologies, it has become clear that crosstalk noise is the important phenomenon that must be taken into account. Despite of being more immune to crosstalk noise than their ASIC (application specific integrated circuit) counterparts, the dense interconnected structures of FPGAs (field programmable gate arrays) invite more vulnerabilities with crosstalk noise. Due to the lack of electrical detail concerning FPGA devices it is quite difficult to test the faults affected …

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Application Of Neural Networks For Data Modeling Of Power Systems With Time Varying Nonlinear Loads, Joy Mazumdar, Ganesh K. Venayagamoorthy, Ronald G. Harley Apr 2007

Application Of Neural Networks For Data Modeling Of Power Systems With Time Varying Nonlinear Loads, Joy Mazumdar, Ganesh K. Venayagamoorthy, Ronald G. Harley

Electrical and Computer Engineering Faculty Research & Creative Works

Nowadays power distribution systems typically operate with nonsinusoidal voltages and currents. Harmonic currents from nonlinear loads propagate through the system and cause harmonic pollution. The premise of IEEE 519 is that there exists a shared responsibility between utilities and customers regarding harmonic control. Maintaining reasonable levels of harmonic voltage distortion depends upon customers limiting their harmonic current injections and utilities controlling the system impedance characteristics. Measurements of current taken at the point of common coupling (PCC) to a customer are expected to determine whether the customer is in compliance with IEEE 519. These measurements yield the combination of nonlinear load …

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Teaching Asynchronous Digital Design In The Undergraduate Computer Engineering Curriculum, Scott C. Smith, Waleed K. Al-Assadi Apr 2007

Teaching Asynchronous Digital Design In The Undergraduate Computer Engineering Curriculum, Scott C. Smith, Waleed K. Al-Assadi

Electrical and Computer Engineering Faculty Research & Creative Works

As demand continues for circuits with higher performance, higher complexity, and decreased feature size, asynchronous (clockless) paradigms will become more widely used in the semiconductor industry, as evidenced by the International Technology Roadmap for Semiconductors' (ITRS) prediction of a likely shift from synchronous to asynchronous design styles in order to increase circuit robustness, decrease power, and alleviate many clock-related issues. ITRS predicts that asynchronous circuits will account for 19% of chip area within the next 5 years, and 30% of chip area within the next 10 years. To meet this growing industry need, students in Computer Engineering should be introduced …

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Variable Regularized Fast Affine Projections, Steven L. Grant, Asif Iqbal Mohammad, Deepak Challa Apr 2007

Variable Regularized Fast Affine Projections, Steven L. Grant, Asif Iqbal Mohammad, Deepak Challa

Electrical and Computer Engineering Faculty Research & Creative Works

This paper introduces a variable regularization method for the fast affine projection algorithm (VR-FAP). It is inspired by a recently introduced technique for variable regularization of the classical, affine projection algorithm (VR-APA). In both algorithms, the regularization parameter varies as a function of the excitation, measurement noise, and residual error energies. Because of the dependence on the last parameter, VR-APA and VR-FAP demonstrate the desirable property of fast convergence (via a small regularization value) when the convergence is poor and deep convergence/immunity to measurement noise (via a large regularization value) when the convergence is good. While the regularization parameter of …

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Combined Training Of Recurrent Neural Networks With Particle Swarm Optimization And Backpropagation Algorithms For Impedance Identification, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine Apr 2007

Combined Training Of Recurrent Neural Networks With Particle Swarm Optimization And Backpropagation Algorithms For Impedance Identification, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine

Electrical and Computer Engineering Faculty Research & Creative Works

A recurrent neural network (RNN) trained with a combination of particle swarm optimization (PSO) and backpropagation (BP) algorithms is proposed in this paper. The network is used as a dynamic system modeling tool to identify the frequency-dependent impedances of power electronic systems such as rectifiers, inverters, and DC-DC converters. As a category of supervised learning methods, the various backpropagation training algorithms developed for recurrent neural networks use gradient descent information to guide their search for optimal weights solutions that minimize the output errors. While they prove to be very robust and effective in training many types of network structures, they …

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A Fuzzy-Pso Based Controller For A Grid Independent Photovoltaic System, Richard L. Welch, Ganesh K. Venayagamoorthy Apr 2007

A Fuzzy-Pso Based Controller For A Grid Independent Photovoltaic System, Richard L. Welch, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a particle swarm optimization (PSO) method for optimizing a fuzzy logic controller (FLC) for a photovoltaic (PV) grid independent system consisting of a PV collector array, a storage battery, and loads (critical and non-critical loads). PSO is used to optimize both the membership functions and the rule set in the design of the FLC. Optimizing the PV system controller yields improved performance, allowing the system to meet more of the loads and keep a higher average state of battery charge. Potential benefits of an optimized controller include lower costs through smaller system sizing and a longer battery …

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Adaptive Power System Stabilizers Using Artificial Immune System, Ganesh K. Venayagamoorthy, Mani Hunjan Apr 2007

Adaptive Power System Stabilizers Using Artificial Immune System, Ganesh K. Venayagamoorthy, Mani Hunjan

Electrical and Computer Engineering Faculty Research & Creative Works

Power system stabilizers (PSSs) are used to damp intra-area and inter-area oscillations in a power network. They provide effective supplementary control by supplying auxiliary control signals to the excitation system of the generators. The proper tuning of PSSs has a significant influence on its effectiveness in providing the required damping under different operating conditions and disturbances. Various algorithms have been successfully implemented to simultaneously design multiple optimal PSSs in power systems. As the power network's operating conditions change, the performance of PSSs degrade. Optimal PSS parameters obtained using bacteria foraging algorithm (BFA) have shown to successfully damp out system oscillations …

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Impact-Induced Damage Characterization Of Composite Plates Using Neural Networks, Steve Eugene Watkins, Farhad Akhavan, Rohit Dua, K. Chandrashekhara, Donald C. Wunsch Apr 2007

Impact-Induced Damage Characterization Of Composite Plates Using Neural Networks, Steve Eugene Watkins, Farhad Akhavan, Rohit Dua, K. Chandrashekhara, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

Impact-induced damage in fiber-reinforced laminated composite plates is characterized. An instrumented impact tower was used to carry out low-velocity impacts on thirteen clamped glass/epoxy composite plates. A range of impact energies was experimentally investigated by progressively varying impactor masses (holding the impact height constant) and varying impact heights (holding the impactor mass constant). The in-plane strain profiles as measured by polyvinylidene fluoride (PVDF) piezoelectric sensors are shown to indicate damage initiation and to correlate to impact energy. Plate damage included matrix cracking, fiber breakage, and delamination. Electronic shearography validated the existence of the impact damage and demonstrated an actual damage …

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Automatic Speech Recognition Using A Predictive Echo State Network Classifier, Mark D. Skowronski, John G. Harris Apr 2007

Automatic Speech Recognition Using A Predictive Echo State Network Classifier, Mark D. Skowronski, John G. Harris

Electrical and Computer Engineering Faculty Research & Creative Works

We have combined an echo state network (ESN) with a competitive state machine framework to create a classification engine called the predictive ESN classifier. We derive the expressions for training the predictive ESN classifier and show that the model was significantly more noise robust compared to a hidden Markov model in noisy speech classification experiments by 8±1 dB signal-to-noise ratio. The simple training algorithm and noise robustness of the predictive ESN classifier make it an attractive classification engine for automatic speech recognition. © 2007 Elsevier Ltd. All rights reserved.

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A Novel Normalized Cross-Correlation Based Echo-Path Change Detector, M. A. Izbal, Steven L. Grant Apr 2007

A Novel Normalized Cross-Correlation Based Echo-Path Change Detector, M. A. Izbal, Steven L. Grant

Electrical and Computer Engineering Faculty Research & Creative Works

A double-talk detector is used to freeze acoustic echo canceller's (AEC) filter adaptation during periods of near-end speech. Increased sensitivity towards double-talk results in declaring echo-path changes as double-talk which adversely effects the performance of an AEC as we freeze adaptation when we really need to adapt. Thus, we need an efficient and simple echo-path change detector so as to differentiate any echo-path variations from double-talk condition. In this paper, we derive a novel test statistic for echo-path change detection. The proposed decision statistic detects any echo-path variations, is normalized properly and is computationally very efficient as compared to existing …

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Nanofabric Pla Architecture With Double Variable Redundancy, Mandar V. Joshi, Waleed K. Al-Assadi Apr 2007

Nanofabric Pla Architecture With Double Variable Redundancy, Mandar V. Joshi, Waleed K. Al-Assadi

Electrical and Computer Engineering Faculty Research & Creative Works

It has been shown that fundamental electronic structures such as Diodes, and FET's can be constructed using selectively doped semiconducting carbon nanotubes or silicon nanowires (CNT's, SiNW's) at nanometer scale. Memory and Logic cores using these technologies have been proposed, that use the configurable junctions in two-dimensional crossbars of CNT's. These memories and logic arrays at this scale exhibit significant amount of defects that account for poor yield. Configuration of these devices in presence of defects demands for an overhead in terms of area and programming time. In this work, we introduce a PLA (programmable logic array) configuration that makes …

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Microwave And Millimeter Wave Nondestructive Testing And Evaluation -- Overview And Recent Advances, Sergey Kharkovsky, R. Zoughi Apr 2007

Microwave And Millimeter Wave Nondestructive Testing And Evaluation -- Overview And Recent Advances, Sergey Kharkovsky, R. Zoughi

Electrical and Computer Engineering Faculty Research & Creative Works

This article focuses on three recent applications of microwave and millimeter wave NDT&E techniques that involve novel instrumentation development and measurements, including: 1) disbond detection in strengthened concrete bridge members retrofitted with carbon fiber reinforced polymer (CFRP) composite laminates; 2) corrosion and precursor pitting detection in painted aluminum and steel substrates; and 3) detection of flaws in spray-on foam insulation and the acreage heat tiles of the Space Shuttle through focused and synthetic imaging techniques. These applications have been performed at the Applied Microwave Nondestructive Testing Laboratory (amntl) at the University of Missouri-Rolla.

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Systems Architecting Heuristics For Systems Engineering Management And Embedded Systems Engineering, Mark S. Anderson, Cihan H. Dagli Apr 2007

Systems Architecting Heuristics For Systems Engineering Management And Embedded Systems Engineering, Mark S. Anderson, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Software development for United States Air Force (USAF) weapon systems is a "right here, right now" prize captured by those who can rapidly develop requirements and deliver a quality product. The Air Logistics Centers (ALCs) located at Tinker Air Force Base (AFB), Oklahoma, Warner-Robins AFB, Georgia, and Hill AFB, Utah develop requirements utilizing 3400 funding to capture this prize. The ALCs identify these requirements as corrective maintenance or perfective and adaptive maintenance. Colleen A. Calimer and John L. BeVier introduce the concept of the "Embedded Systems Engineer" in their 2004 INCOSE paper "Embedded Systems Engineering: Managing Systems Complexity, Change, and …

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System Evaluation And Description Using Abstract Relation Types (Art), Joseph J. Simpson, Ann K. Miller, Cihan H. Dagli Apr 2007

System Evaluation And Description Using Abstract Relation Types (Art), Joseph J. Simpson, Ann K. Miller, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Two abstract relation types (ART) are developed to represent, describe and establish a computational framework for a system. An abstract relation type is closely related to and builds upon two fundamental ideas. The first idea is the binary relation and structural modeling techniques developed by John N. Warfield. The second idea is the concept of abstract data types. These two ideas are combined to create an abstract relation type that provides a structured representation and computational method for systems and system components. The complete system description approach is based on six abstract relation types: context, concept, functions, requirements, architecture, and …

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