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2003

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Articles 271 - 300 of 2071

Full-Text Articles in Engineering

Cs 790-01: Introduction To Parallel Algorithms, Natsuhiko Futamura Oct 2003

Cs 790-01: Introduction To Parallel Algorithms, Natsuhiko Futamura

Computer Science & Engineering Syllabi

Low-cost parallel computers such as PC clusters are becoming available, and many previously unsolvable problems can be solved using such computers. However, designing algorithms that perform well on parallel computers is often challenging. The focus of this course is on learning how to design algorithms for parallel computers and how to evaluate them.

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Use Of Hierarchical Decision Modeling For Site Selection Of A Major League Baseball Stadium In Portland, Priya Ajgaonkar, Aroonrat Auysakul, Edward Cespedes, Ryan Jefferis, Seiji Shinriki Oct 2003

Use Of Hierarchical Decision Modeling For Site Selection Of A Major League Baseball Stadium In Portland, Priya Ajgaonkar, Aroonrat Auysakul, Edward Cespedes, Ryan Jefferis, Seiji Shinriki

Engineering and Technology Management Student Projects

This paper proposes a hierarchical decision model to select a site from various potential sites for a major league baseball stadium in Portland, Oregon. A short background on MLB in Portland, with all the related factors, is provided. Next this paper describes Hierarchical Decision Modeling using pair wise comparisons and the process of using this as a decision making tool. A detailed description of the HDM developed is then provided. This model includes determination of the number of levels of the HDM and their relationship with each other. It describes all the elements of each level and the process of …

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M-Ary Amplitude Shift Keying Ofdm System, Fuqin Xiong Oct 2003

M-Ary Amplitude Shift Keying Ofdm System, Fuqin Xiong

Electrical and Computer Engineering Faculty Publications

Coherent M-ary amplitude-shift keying (MASK) is proposed for use in orthogonal frequency-division multiplexing (OFDM) systems. The frequency separation between subcarriers is only 1/2T instead of 1/T. With a slightly wider bandwidth, an √M-ary ASK OFDM can achieve the same bit-error rate (BER) of M-ary quadrature amplitude modulation (QAM) OFDM and a better BER than that of M-ary phase-shift keying (MPSK) OFDM. The √M-ary ASK OFDM has the same peak-to-average-power ratio as that of the M-ary QAM OFDM. The MASK OFDM can be implemented digitally and efficiently by fast cosine transform and demodulated by inverse fast cosine transform. Comparisons show that …

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Toward Development Of A Steel Bridge System - Simple For Dead Load And Continuous For Live Load, Atorod Azizinamini, Aaron Jon Yakel, Nick J. Lampe Oct 2003

Toward Development Of A Steel Bridge System - Simple For Dead Load And Continuous For Live Load, Atorod Azizinamini, Aaron Jon Yakel, Nick J. Lampe

Nebraska Department of Transportation: Research Reports

No abstract provided.

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Development Of A Design Guideline For Phase Construction Of Steel Girder Bridges, Atorod Azizinamini Oct 2003

Development Of A Design Guideline For Phase Construction Of Steel Girder Bridges, Atorod Azizinamini

Nebraska Department of Transportation: Research Reports

No abstract provided.

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Vfr Flight Into Imc: Reducing The Hazard, Dale R. Wilson, Teresa Sloan Oct 2003

Vfr Flight Into Imc: Reducing The Hazard, Dale R. Wilson, Teresa Sloan

All Faculty Scholarship for the College of Education and Professional Studies

Aircraft accidents resulting from initiating or continuing visual flight rules (VFR) flight into instrument meteorological conditions (IMC) continue to be one of the leading causes of fatal aircraft accidents. This paper outlines the nature and scope of this hazard and reviews past and present initiatives designed to reduce it. It also suggests future interventions that may be effective in reducing the threat of this aviation hazard.

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Construction Of Tire Shreds Test Embankment, Rodrigo Salgado, Sungmin Yoon, Nayyar Zia Siddiki Oct 2003

Construction Of Tire Shreds Test Embankment, Rodrigo Salgado, Sungmin Yoon, Nayyar Zia Siddiki

JTRP Technical Reports

According to recent research, it is estimated that there are more than 500 million tires stockpiled across the United States, and 270 million more are generated each year. A significant number of tires are left in empty yards and even dumped illegally. Tires have characteristics that make them not easy to dispose, and potentially combustible. For these reasons, there is a strong need to find beneficial ways to recycle or reuse tires. Civil engineering applications constitute one of biggest markets for scrap tires. Tire shreds can be used as fill material, for example. The objective of this research is to …

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Implementation Of Steel Bridge Protection Policy, Luh M. Chang, Po-Han Chen, Sangwook Lee Oct 2003

Implementation Of Steel Bridge Protection Policy, Luh M. Chang, Po-Han Chen, Sangwook Lee

JTRP Technical Reports

Many Departments of Transportation (DOTs) have made tremendous efforts for managing their civil infrastructure systems effectively and to meet public demands for their performance and safety. The introduction of warranties help many DOTs keep their construction with better quality by shifting post-construction responsibilities to contractors. Warranties are applied to numerous items according to each DOT’s needs, and this research focuses on steel bridge painting protection policy for Indiana Department of Transportation (INDOT). This research represents the development of an implementable warranty clause for protecting steel bridge painting and the image processing technique for the objective and quantitative painting quality assessment. …

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Modeling And Analysis Of Fault Tolerant Multistage Interconnection Networks, Minsu Choi, Nohpill Park, Fabrizio Lombardi Oct 2003

Modeling And Analysis Of Fault Tolerant Multistage Interconnection Networks, Minsu Choi, Nohpill Park, Fabrizio Lombardi

Electrical and Computer Engineering Faculty Research & Creative Works

Performance and reliability are two of the most crucial issues in today's high-performance instrumentation and measurement systems. High speed and compact density multistage interconnection networks (MINs) are widely-used subsystems in different applications. New performance models are proposed to evaluate a novel fault tolerant MIN arrangement, thereby assuring performance and reliability with high confidence level. A concurrent fault detection and recovery scheme for MINs is considered by rerouting over redundant interconnection links under stringent real-time constraints for digital instrumentation as sensor networks. A switch architecture for concurrent testing and diagnosis is proposed. New performance models are developed and used to evaluate …

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Resolution Of Multiple Ssdna Structures In Free Solution Electrophoresis, Eve F. Fabrizio, Ali Nadim, James D. Sterling Oct 2003

Resolution Of Multiple Ssdna Structures In Free Solution Electrophoresis, Eve F. Fabrizio, Ali Nadim, James D. Sterling

Business and Information Technology Faculty Research & Creative Works

By using high concentrations of buffer, electroosmotic flow within uncoated channels of a microfluidic chip was minimized, allowing the free solution electrophoretic separation of DNA. More importantly, because of the ability to efficiently dissipate heat within these channels, field strengths as high as 600 V/cm could be applied with minimal Joule heating (< 2 °C). As a result of the higher field strengths, separations within an 8-cm-long channel were achieved within a few minutes. However, when the electrophoretic separation of single-stranded DNA (ssDNA) less than 22 bases in length was performed, containing the fluorophore Texas Red as an end label, more than the expected single peak was observed at this high electric field. On the other hand, the free solution electrophoresis of a double-stranded DNA (dsDNA) consisting of a random sequence did exhibit the expected single peak. The appearance of these multiple peaks for ssDNA is shown to be dependent upon the base content and sequence of the ssDNA as well as on the chemical structure of the fluorophore used to tag the DNA for detection. Specifically, the peaks can be attributed to different secondary structures that result either from hydrophobic interactions between the DNA bases and an uncharged fluorescent dye or from G-quadruplexes within guanine-rich strands.

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Self-Consistent Modification To The Electron Density Of States Due To Electron-Phonon Coupling In Metals, Fatih Dogan, Frank Marsiglio Oct 2003

Self-Consistent Modification To The Electron Density Of States Due To Electron-Phonon Coupling In Metals, Fatih Dogan, Frank Marsiglio

Materials Science and Engineering Faculty Research & Creative Works

The "standard" theory of a normal metal consists of an effective electron band which interacts with phonons and impurities. The effects due to the electron-phonon interaction are often delineated within the Migdal approximation; the properties of many simple metals are reasonably well described with such a description. On the other hand, if the electron-phonon interaction is sufficiently strong, a polaron approach is more appropriate. The purpose of this paper is to examine to what degree the Migdal approximation is self-consistent, as the coupling strength increases. We find that changes in the electron density of states become significant for very large …

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Time Domain Dielectric Spectroscopy Analysis Of Hl-60 Cell Suspensions After Microsecond And Submicrosecond Pulsed Electric Fields, Allen Laurence Garner Oct 2003

Time Domain Dielectric Spectroscopy Analysis Of Hl-60 Cell Suspensions After Microsecond And Submicrosecond Pulsed Electric Fields, Allen Laurence Garner

Electrical & Computer Engineering Theses & Dissertations

Pulsed electric fields (PEF's) above a certain voltage threshold cause electroporation for microsecond pulses and intracellular effects for submicrosecond pulses. Models describing these effects often depend on the electrical properties of the cell, which are altered by the PEF. Time domain dielectric spectroscopy was used to provide data for these models and to measure changes in the conductivity of HL-60 cell suspensions due to single 50 μs and 10 ns PEF's of the same energy. For 1.1 kV/cm, 50 μs pulses, the conductivity rose within a minute after the pulse and dropped dramatically approximately forty minutes after the pulse. For …

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Bs News Oct 2003

Bs News

Building Services Engineering

No abstract provided.

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Method For Performing Accelerated Characterization Of Viscoelastic Constitutive Behavior Of Asphaltic Concrete, Curtis Berthelot, D. H. Allen, Chad Searcy Oct 2003

Method For Performing Accelerated Characterization Of Viscoelastic Constitutive Behavior Of Asphaltic Concrete, Curtis Berthelot, D. H. Allen, Chad Searcy

Department of Engineering Mechanics: Faculty Publications

Constitutive models based in continuum mechanics are formulated for modeling the time dependent mechanical re¬sponse of asphaltic concrete. The model chosen for the initial phase of study is linear viscoelastic, resulting in stress-strain re¬lations that are of the single integral Boltzmann type in time. Experimental equipment and testing protocols are described for obtaining material properties within the viscoelastic framework selected for characterization. A frequency sweep experimental technique is described for obtaining composite properties from short-term tests that can be used to predict long-term, time-depen¬dent material behavior. Mathematical techniques are described for converting experimentally obtained complex compliances to creep compliances and …

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Phosphorus Management, Bahman Eghball, J.F. Shanahan, Gary E. Varvel, John E. Gilley Oct 2003

Phosphorus Management, Bahman Eghball, J.F. Shanahan, Gary E. Varvel, John E. Gilley

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Soils with high levels of P can contribute to excess P in runoff and subsequently pollute the surface water. Excess P in the soil can be removed from the system by harvesting crops. The objectives of this study were to evaluate corn (Zea mays L.) P removal effects on soil P reduction, and to evaluate various corn hybrids and soybean [Glycine max (L.) Merr.] varieties for differences in grain P concentration and P removal. Soil with varying P levels as a result of annual or biennial beef cattle (Bos Taurus) feedlot manure or compost application was …

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Inside Unlv, Cate Weeks, Diane Russell, Carol C. Harter, Martin Watson Oct 2003

Inside Unlv, Cate Weeks, Diane Russell, Carol C. Harter, Martin Watson

Inside UNLV

No abstract provided.

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Corrosion And Mass Transport Processes In Carbon Steel Miniature Waste Packages, James Cizdziel, Kaveh Zarrabi, Susan Lestrange, Amy J. Smiecinski Oct 2003

Corrosion And Mass Transport Processes In Carbon Steel Miniature Waste Packages, James Cizdziel, Kaveh Zarrabi, Susan Lestrange, Amy J. Smiecinski

Publications (YM)

In this study, we have systematically investigated corrosion and mass transport processes in carbon steel miniature waste packages (MWP) in dynamic systems (water in, water out) under varying chemical conditions. The MWP were fabricated to have similar configuration to the DOE Spent Nuclear Fuel (SNF) waste package and that individual components to be in scale with each other compare to the SNF waste package. Two MWP configurations were studied: a "bathtub" model and a "flow-through" model. By slowly dripping 4 different solutions (groundwater obtained from well water J-13 located near Yucca Mountain, and J-13 water adjusted to low-pH, high-salinity, and …

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Multi-Criteria Decision Analysis With Probabilistic Risk Assessment For The Management Of Contaminated Ground Water, I. Khadam, Jagath J. Kaluarachchi Oct 2003

Multi-Criteria Decision Analysis With Probabilistic Risk Assessment For The Management Of Contaminated Ground Water, I. Khadam, Jagath J. Kaluarachchi

Civil and Environmental Engineering Faculty Publications

Traditionally, environmental decision analysis in subsurface contamination scenarios is performed using cost–benefit analysis. In this paper, we discuss some of the limitations associated with cost–benefit analysis, especially its definition of risk, its definition of cost of risk, and its poor ability to communicate risk-related information. This paper presents an integrated approach for management of contaminated ground water resources using health risk assessment and economic analysis through a multi-criteria decision analysis framework. The methodology introduces several important concepts and definitions in decision analysis related to subsurface contamination. These are the trade-off between population risk and individual risk, the trade-off between the …

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Seven Principles Of Efficient Human Robot Interaction, Michael A. Goodrich, Dan R. Olsen Jr. Oct 2003

Seven Principles Of Efficient Human Robot Interaction, Michael A. Goodrich, Dan R. Olsen Jr.

Faculty Publications

Advances in robot technology and artificial intelligence have increased the range of robot applications as well as the importance of supporting human interaction with robots and robot teams. Previous work by the authors has highlighted the importance of creating neglect tolerant autonomy and efficient interfaces. In this paper, lessons learned from evaluating neglect tolerance and interface efficiency are compiled into a set of principles for efficient interaction. Emphasis is placed on designing efficient interfaces, but many of the principles require autonomy levels that support the principles. Each principle is illustrated by an example and motivated by citing relevant factors from …

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Multi-Agent Coalition Via Autonomous Price Negotiation In A Real-Time Web Environment, Hoong Chuin Lau, Wei Sian Lim Oct 2003

Multi-Agent Coalition Via Autonomous Price Negotiation In A Real-Time Web Environment, Hoong Chuin Lau, Wei Sian Lim

Research Collection School Of Computing and Information Systems

In e-marketplaces, customers specify job requests in real-time and agents form coalitions to service them. This paper proposes a protocol for self-interested agents to negotiate prices in forming successful coalitions. We propose and experiment with two negotiation schemes: one allows information sharing while the other does not.

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The Effect Of Pruning And Compression On Graphical Representations Of The Output Of A Speech Recognizer, Yang Liu, Mary P. Harper, Michael T. Johnson, Leah H. Jamieson Oct 2003

The Effect Of Pruning And Compression On Graphical Representations Of The Output Of A Speech Recognizer, Yang Liu, Mary P. Harper, Michael T. Johnson, Leah H. Jamieson

Electrical and Computer Engineering Faculty Research and Publications

Large vocabulary continuous speech recognition can benefit from an efficient data structure for representing a large number of acoustic hypotheses compactly. Word graphs or lattices have been chosen as such an efficient interface between acoustic recognition engines and subsequent language processing modules. This paper first investigates the effect of pruning during acoustic decoding on the quality of word lattices and shows that by combining different pruning options (at the model level and word level), we can obtain word lattices with comparable accuracy to the original lattices and a manageable size. In order to use the word lattices as the input …

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Characterization And Removal Of Tributyltin (Tbt) From Shipyard Washwasters Laboratory And Full-Scale Studies, Ram Prasad Oct 2003

Characterization And Removal Of Tributyltin (Tbt) From Shipyard Washwasters Laboratory And Full-Scale Studies, Ram Prasad

Civil & Environmental Engineering Theses & Dissertations

Tributyltin has long been used as a biocide in many consumer products to prevent biological growth and fouling. One of the persistent uses of tributyltin is as an antifouling agent in marine paints where its use prevents biological growths on hulls and greatly improves the fuel efficiency of ships. Due to observed adverse effects (tributyltin is an endocrine disrupter) on non-target organisms like shellfish, oysters and snails, the use of tributyltin in marine paints has been banned in many nations and its point source discharge is now regulated through the Virginia Permit Discharge Elimination System (VPDES) program (first state to …

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Brownian Dynamics Simulation Studies Of Ion Throughput During Cellular Electroporation, Juan A. Gonzalez-Cuevas Oct 2003

Brownian Dynamics Simulation Studies Of Ion Throughput During Cellular Electroporation, Juan A. Gonzalez-Cuevas

Electrical & Computer Engineering Theses & Dissertations

The purpose of the present research work is to analyze the flow of ions through pores formed in the plasma membrane of biological cells during electroporation. In this regard, simulations have been conducted to track the movement of ions in 3-D space based on a Brownian dynamics model, which is mostly deterministic but has some stochastic properties to account for ionic scattering. From the Brownian dynamics simulations, it has been possible to estimate the pore's conductance as well as transport parameters such as the diffusion coefficient and mobility within the pore region, of which there is no experimental data currently …

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Ua66/1/5 Applied Research & Technology Program Newsletter, Issue 1, Wku Applied Research & Technology Program Sep 2003

Ua66/1/5 Applied Research & Technology Program Newsletter, Issue 1, Wku Applied Research & Technology Program

WKU Administration Documents

Newsletter created by and about the Applied Research & Technology Program.

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Progress In The Development Of A Recombinant Vaccine For Human Hookworm Disease: The Human Hookworm Vaccine Initiative, Peter J. Hotez, Bin Zhan, Jeffrey M. Bethony, Alex Loukas, Angela Williamson, Gaddam Narsa Goud, John M. Hawdon, Azra Dobardzic, Reshad Dobardzic, Kashinath Ghosh, Maria Elena Bottazzi, Susana Mendez, Bernard Zook, Yan Wang, Sen Liu, Idong Essiet-Gibson, Sophia Chung-Debose, Shuhua Xiao, David Knox, Michael Meagher, Mehmet Inan, Rodrigo Correa-Oliviera, Paul Vilk, Herman R. Shepherd, Walter Brandt, Philip K. Russell Sep 2003

Progress In The Development Of A Recombinant Vaccine For Human Hookworm Disease: The Human Hookworm Vaccine Initiative, Peter J. Hotez, Bin Zhan, Jeffrey M. Bethony, Alex Loukas, Angela Williamson, Gaddam Narsa Goud, John M. Hawdon, Azra Dobardzic, Reshad Dobardzic, Kashinath Ghosh, Maria Elena Bottazzi, Susana Mendez, Bernard Zook, Yan Wang, Sen Liu, Idong Essiet-Gibson, Sophia Chung-Debose, Shuhua Xiao, David Knox, Michael Meagher, Mehmet Inan, Rodrigo Correa-Oliviera, Paul Vilk, Herman R. Shepherd, Walter Brandt, Philip K. Russell

Michael Meagher Publications

Hookworm infection is one of the most important parasitic infections of humans, possibly outranked only by malaria as a cause of misery and suffering. An estimated 1.2 billion people are infected with hookworm in areas of rural poverty in the tropics and subtropics. Epidemiological data collected in China, Southeast Asia, and Brazil indicate that, unlike other soil-transmitted helminth infections, the highest hookworm burdens typically occur in adult populations, including the elderly. Emerging data on the host cellular immune responses of chronically infected populations suggest that hookworms induce a state of host anergy and immune hyporesponsiveness. These features account for the …

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Remote Monitoring Of Repository Integrity Using Passive Seismic Arrays, Barbara Luke, Evangelos Yfantis Sep 2003

Remote Monitoring Of Repository Integrity Using Passive Seismic Arrays, Barbara Luke, Evangelos Yfantis

Publications (YM)

Once radioactive waste is emplaced in the repository, the challenge of monitoring the continued integrity of the excavated openings (e.g., emplacement drifts) escalates tremendously. We envision a seismic monitoring array installed on the surface at Yucca Mountain, which operates automatically to monitor repository opening stability in the long term. The objective is to monitor and validate the structural integrity of the emplacement drifts through identifying and localizing rock falls that could compromise drift access, hinder waste retrievability, and potentially reduce the effective life of waste canisters. Collateral benefits of the system include the ability to address some outstanding uncertainties regarding …

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Compliant Centrifugal Clutches: Design, Analysis, And Testing, Nathan B. Crane Sep 2003

Compliant Centrifugal Clutches: Design, Analysis, And Testing, Nathan B. Crane

Theses and Dissertations

Existing classes of centrifugal clutch concepts were reviewed. The pseudo-rigid-body model (PRBM), rigid-body replacement synthesis, force-deflection analysis, compliance potential evaluation, and compliant concept evaluation were used to develop effective new centrifugal clutch concepts. These methods helped develop and model four novel compliant centrifugal clutch designs, model two existing designs, and identify a concept with excellent potential for low-cost centrifugal clutch applications. This concept, the floating opposing arm (FOA) clutch, doubles the torque capacity metric relative to existing compliant designs. Torque and engagement speed models for this clutch were developed and verified against four prototype clutches. Additional novel designs devel-oped through …

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A Texture Evolution Model In Cubic-Orthotropic Polycrystalline System, Brent L. Adams, H. Garmestani, D. S. Li Sep 2003

A Texture Evolution Model In Cubic-Orthotropic Polycrystalline System, Brent L. Adams, H. Garmestani, D. S. Li

Faculty Publications

This work has been funded under the AFOSR Grant # F49620-03-1-0011 and Army Research Lab Contract # DAAD17-02-P-0398 and DAAD 19-01-1-0742. B.L. Adams acknowledges support of Army Research Office, Proposal No. 42566-MS. The authors express their sincere gratitude to Professor Surya Kalidindi, for helpful suggestions and correspondence for the derivation of the processing path functions. A new methodology based on a conservation principle in the orientation space is developed to simulate the texture evolution in a cubic-orthotropic polycrystalline system. A least squares error method was used to improve the accuracy of the simulation results obtained from the texture evolution function. …

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Predictability Of Seasonal Runoff In The Mississippi River Basin, Edwin P. Maurer, Dennis P. Lettenmaier Sep 2003

Predictability Of Seasonal Runoff In The Mississippi River Basin, Edwin P. Maurer, Dennis P. Lettenmaier

Civil, Environmental and Sustainable Engineering

Recent advances in climate prediction and remote sensing offer the potential to improve long-lead streamflow forecasts and to provide better land surface state estimates at the time of forecast. We characterize predictability of runoff at seasonal timescales in the Mississippi River basin due to climatic persistence (represented by El Niño-Southern Oscillation and the Arctic Oscillation) and persistence related to the initial land surface state (soil moisture and snow). These climate and land surface state indicators, at varying lead times, are then used in a multiple linear regression to explain the variance of seasonal average runoff. Soil moisture dominates runoff predictability …

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Directional Solidification And Convection In Small Diameter Crucibles, Jun Chen, P. K. Sung, D. R. Poirier, H. C. De Groh Iii Sep 2003

Directional Solidification And Convection In Small Diameter Crucibles, Jun Chen, P. K. Sung, D. R. Poirier, H. C. De Groh Iii

Chemical & Biomedical Engineering Faculty Publications

Pb–2.2 wt.% Sb alloy was directionally solidified in 1, 2, 3 and 7 mm diameter crucibles. Pb–Sb alloy presents a solutally unstable case. Under plane–front conditions, the resulting macrosegregation along the solidified length indicates that convection persists even in the 1 mm diameter crucible. Al–2 wt.% Cu alloy was directionally solidified because this alloy was expected to be stable with respect to convection. Nevertheless, the resulting macrosegregation pattern and the microstructure in solidified examples indicated the presence of convection. Simulations performed for both alloys show that convection persists for crucibles as small as 0.6 mm of diameter …

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