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Unmanned Air Vehicle Testbed For Cooperative Control Experiments, Timothy W. Mclain, Randal W. Beard Jul 2004

Unmanned Air Vehicle Testbed For Cooperative Control Experiments, Timothy W. Mclain, Randal W. Beard

Faculty Publications

This paper describes the MAGICC Lab unmanned air vehicle (UAV) testbed at Brigham Young University. Motivation for pursuing experimental research with UAVs is given as well as a historical perspective of the UAV testbed development. Lessons learned through the development and use of the testbed over the past several years are summarized.

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Learning Nursing Research Through Faculty-Mentored Projects, Patricia K. Ravert, Ben Boyer, Kirsten Harmon, Holly Scoffield Jul 2004

Learning Nursing Research Through Faculty-Mentored Projects, Patricia K. Ravert, Ben Boyer, Kirsten Harmon, Holly Scoffield

Faculty Publications

Baccalaureate nursing educators have incorporated nursing research content into the curriculum for many years. Our university also proposes that students have a faculty-mentored learning experience at least once during their undergraduate education. Student research, guided by a faculty mentor, provides an excellent opportunity for students to learn about and participate in nursing research. The authors describe a unique experience of nursing students working as research assistants in a faculty research project using a human patient simulator.

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Experimental And Numerical Investigation Of Turbulent Flow Induced Pipe Vibration In Fully Developed Flow, Matthew T. Pittard, R. Daniel Maynes, Jonathan D. Blotter, Robert P. Evans Jun 2004

Experimental And Numerical Investigation Of Turbulent Flow Induced Pipe Vibration In Fully Developed Flow, Matthew T. Pittard, R. Daniel Maynes, Jonathan D. Blotter, Robert P. Evans

Faculty Publications

Flow-induced pipe vibration caused by fully developed pipe flow has been observed but not fully investigated when turbulent flow prevails. This article presents experimental results that indicate a strong correlation between the volume flow rate and a measure of the pipe vibration. In this work, the standard deviation of the frequency-averaged time-series signal, measured using an accelerometer attached to the pipe, is used as the measure of pipe vibration. A numerical, fluid-structure interaction (FSI) model used to investigate the relationship between pipe wall vibration and the physical characteristics of turbulent flow is also presented. This numerical FSI approach, unlike commercial …

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Autostereoscopic 3d Display Based On Micromirror Array, Gregory P. Nordin, C. H. Ahn, H. J. Cho, S. T. Kowel, J. H. Kulick, J. Yan Jun 2004

Autostereoscopic 3d Display Based On Micromirror Array, Gregory P. Nordin, C. H. Ahn, H. J. Cho, S. T. Kowel, J. H. Kulick, J. Yan

Faculty Publications

A novel approach for three-dimensional (3-D) display systems implemented with a micromirror array was proposed, designed, realized, and tested. The major advantages of this approach include the following: 1 micromirrors are reflective and hence achromatic (panchromatic), 2 a wide variety of displays can be used as image sources, and 3 time multiplexing can be introduced on top of space multiplexing to optimize the viewing zone arrangements. A two-view (left and right) 3-D autostereoscopic display system was first constructed. Left- and right-eye views in the forms of both still and motion 3-D scenes were displayed, and viewers were able to fuse …

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Ethnic/Racial Matching Of Clients And Social Workers In Public Child Welfare, Robin Perry, Gordon E. Limb Jun 2004

Ethnic/Racial Matching Of Clients And Social Workers In Public Child Welfare, Robin Perry, Gordon E. Limb

Faculty Publications

Although considerable debate exists throughout the human-service literature regarding the potential benefits and limitations associated with ethnic/racial matching of clients and workers, there are few studies that examine the prevalence of this practice with large representative samples. This study utilizes a secondary analysis of data collected from 4813 public-child-welfare workers throughout California. Using census data to control for county-specific population demographics, American-Indian, Hispanic/Latino(a), Caucasian, and Asian-American child-welfare workers are more than two times more likely to have caseloads with a high percentage of clients who match their race/ethnicity than workers self-identified as another race/ethnicity. African-American workers are 1.28 times more …

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Accountability Matters (Lecture), Melvin J. Dubnick Jun 2004

Accountability Matters (Lecture), Melvin J. Dubnick

Faculty Publications

This document explores the importance, challenges, and misconceptions surrounding accountability in governance, emphasizing its core role beyond promises.

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Geminal Model Chemistry Ii. Perturbative Corrections, Vitaly A. Rassolov, Feng Xu, Sophya Garashchuk Jun 2004

Geminal Model Chemistry Ii. Perturbative Corrections, Vitaly A. Rassolov, Feng Xu, Sophya Garashchuk

Faculty Publications

We introduce and investigate a chemical model based on perturbative corrections to the product of singlet-type strongly orthogonal geminals wave function. Two specific points are addressed (i) Overall chemical accuracy of such a model with perturbative corrections at a leading order; (ii) Quality of strong orthogonality approximation of geminals in diverse chemical systems. We use the Epstein–Nesbet form of perturbation theory and show that its known shortcomings disappear when it is used with the reference Hamiltonian based on strongly orthogonal geminals. Application of this model to various chemical systems reveals that strongly orthogonal geminals are well suited for chemical models, …

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Stickiness And The Adaptation Of Organizational Practices In Cross-Border Knowledge Transfers, Robert J. Jensen, Gabriel Szulanski Jun 2004

Stickiness And The Adaptation Of Organizational Practices In Cross-Border Knowledge Transfers, Robert J. Jensen, Gabriel Szulanski

Faculty Publications

The re-use of organizational practices in multiple locations is a fundamental way MNCs leverage knowledge to seek competitive advantage. Scholars approaching the issue of adaptation from both a market and an institutional perspective argue that, in order to achieve fit with the local environment, some degree of adaptation is advisable with the need for adaptation increasing as the institutional distance between source and recipient locations increases. However, arguments to date have examined the effect of adaptation primarily on a subsidiary's long term performance. A necessary precursor is to understand the effect of adaptation on the transfer process itself as transfer …

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Health Care Barriers For Latino Children And Provision Of Culturally Competent Care, Jane H. Lassetter, Joan H. Baldwin Jun 2004

Health Care Barriers For Latino Children And Provision Of Culturally Competent Care, Jane H. Lassetter, Joan H. Baldwin

Faculty Publications

The demography of the United States is rapidly changing. The impressive growth rate of Latino populations within the United States has great impact on health care. This article includes discussion of a significant increase from 1988 to 2000 in Latino utilization of emergency department and inpatient services at a pediatric medical center in Salt Lake City, Utah, information on health care barriers for Latinos, and suggestions for providing culturally competent care.

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Response To Comments On “Passivity-Based Control Of Saturated Induction Motors”, Levent U. Gökdere, Marwan A. Simaan, Charles W. Brice Jun 2004

Response To Comments On “Passivity-Based Control Of Saturated Induction Motors”, Levent U. Gökdere, Marwan A. Simaan, Charles W. Brice

Faculty Publications

Contrary to the claims made in the comments to our paper, the passivity-based controller developed for induction motors has already been tested on the same demanding trajectories used for the input–output linearization controller. The experimental results show that the passivitybased controller provides closer tracking of the same mechanical trajectory, when compared with the input–output linearization controller.

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Empirical Analysis Of Computational And Accuracy Tradeoffs Using Compactly Supported Radial Basis Functions For Surface Reconstruction, Weiming Liu, Bryan S. Morse, Lauralea Otis Jun 2004

Empirical Analysis Of Computational And Accuracy Tradeoffs Using Compactly Supported Radial Basis Functions For Surface Reconstruction, Weiming Liu, Bryan S. Morse, Lauralea Otis

Faculty Publications

Implicit surfaces can be constructed from scattered surface points using radial basis functions (RBFs) to interpolate the surface’s embedding function. Many researchers have used thin-plate spline RBFs for this because of their desirable smoothness properties. Others have used compactly supported RBFs, leading to a sparse matrix solution with lower computational complexity and better conditioning. However, the limited radius of support introduces a free parameter that leads to varying solutions as well as varying computational requirements: a larger radius of support leads to smoother and more accurate solutions but requires more computation. This paper presents an empirical analysis of this radius …

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Simulation Of Hot Electron And Quantum Effects In Algan/Gan Heterostructure Field Effect Transistors, N. Braga, R. Mickevicius, R. Gaska, H. Xu, M. S. Shur, M. Asif Khan, Grigory Simin, J. Yang Jun 2004

Simulation Of Hot Electron And Quantum Effects In Algan/Gan Heterostructure Field Effect Transistors, N. Braga, R. Mickevicius, R. Gaska, H. Xu, M. S. Shur, M. Asif Khan, Grigory Simin, J. Yang

Faculty Publications

We report on simulations of electrical characteristics of AlGaN/(InGaN)/GaN heterostructurefield effect transistors with quantum and hot electroneffects taken into account. Polarization charges lead to quantum confinement of electrons in the channel and to the formation of two-dimensional electron gas. The electron quantization leads to the spread of the electronwave function into the barrier and bulk but does not have significant impact on dc electrical characteristics.Hot electrons play an important part in the charge transport by spilling over into the bulk GaN where they are captured by traps. This leads to negative differential conductivity, which is also observed experimentally. The simulation …

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President's Page, Samantha K. Hastings Jun 2004

President's Page, Samantha K. Hastings

Faculty Publications

No abstract provided.

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Responding To Policies At Runtime In Trustbuilder, Michael D. Jones, Kent E. Seamons, Bryan Smith Jun 2004

Responding To Policies At Runtime In Trustbuilder, Michael D. Jones, Kent E. Seamons, Bryan Smith

Faculty Publications

To preview my talk, I will first give a brief overview of trust negotiation and policy exchange. Third, I will discuss the limitations of current compliance checkers and adaptations needed for trust negotiation. Finally, I will outline the contributions of this research.

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The Impact Of Species Concept On Biodiversity Studies, Keith A. Crandall, Paul-Michael Agapow, Olaf R. P. Bininda-Emonds, John L. Gittleman, Georgina M. Mace, Jonathon C. Marshall, Andy Purvis Jun 2004

The Impact Of Species Concept On Biodiversity Studies, Keith A. Crandall, Paul-Michael Agapow, Olaf R. P. Bininda-Emonds, John L. Gittleman, Georgina M. Mace, Jonathon C. Marshall, Andy Purvis

Faculty Publications

Species are defined using a variety of different operational techniques. While discussion of the various methodologies has previously been restricted mostly to taxonomists, the demarcation of species is also crucial for conservation biology. Unfortunately, different methods of diagnosing species can arrive at different entities. Most prominently, it is widely thought that use of a phylogenetic species concept may lead to recognition of a far greater number of much less inclusive units. As a result, studies of the same group of organisms can produce not only different species identities but also different species range and number of individuals. To assess the …

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Correlation And Covariance Of Satellite Scatterometer Measurements, David G. Long, Peter K. Yoho Jun 2004

Correlation And Covariance Of Satellite Scatterometer Measurements, David G. Long, Peter K. Yoho

Faculty Publications

Capable scatterometer designs have been developed that seek improved resolution through the use of higher pulse sampling rates. The high sampling rates bring the traditional scatterometry assumption of measurement independence into question. This paper uses fundamental scattering theory to derive general expressions for correlation and covariance between scatterometer measurements and provides practical analysis using current and future instruments as examples. The paper derives expressions for the measurement variance parameter Kp when measurement correlation due to Rayleigh fading effects is present and relates Kp to the statistics of multiple pulse measurements. A function of the transmit signal modulation and receive processing, …

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When Do Fair Beliefs Infiuence Bargaining Behavior? Experimental Bargaining In Japan And The United States, Nancy R. Buchan, Rachel T.A. Croson, Eric J. Johnson Jun 2004

When Do Fair Beliefs Infiuence Bargaining Behavior? Experimental Bargaining In Japan And The United States, Nancy R. Buchan, Rachel T.A. Croson, Eric J. Johnson

Faculty Publications

In this research, we examine the influence of beliefs about fairness on bargaining behavior. Using a repeated ultimatum game, we examine bargaining contexts in Japan and the United States in which buyers' or sellers' fair beliefs are either in alignment with or in conflict with their own self-interest. We suggest that understanding the relationship between fair beliefs and self-interest is central to understanding when fair beliefs will influence bargaining behavior. Our results demonstrate that fair beliefs predict bargaining behavior when they are aligned with one's own self-interest.

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Linear Voltage To Current Conversion Using Submicron Cmos Devices, David J. Comer, Donald Comer, Aaron Shreeve May 2004

Linear Voltage To Current Conversion Using Submicron Cmos Devices, David J. Comer, Donald Comer, Aaron Shreeve

Faculty Publications

Sponsorship: AMIS--American Micro-Systems, Inc. This paper investigates the linearity of submicron gate length CMOS devices and their behavior in open loop voltage to current (V-I) converters. Methods are developed to estimate the deviation from linearity in V-I converters due to short-channel effects. Using these methods, a converter is designed and fabricated on a 0.35 micron process. The measured deviation from linearity is less than 1% and the simulated bandwidth is 1 GHz.

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Property Rights And Sacred Sites: Federal Regulatory Responses To American Indian Religious Claims On Public Land, Marcia A. Yablon-Zug May 2004

Property Rights And Sacred Sites: Federal Regulatory Responses To American Indian Religious Claims On Public Land, Marcia A. Yablon-Zug

Faculty Publications

No abstract provided.

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Impossibility Of C∞ Variation Or Formal Power Series Variation In Solutions To Hilbert's 17th Problem, Charles N. Delzell May 2004

Impossibility Of C∞ Variation Or Formal Power Series Variation In Solutions To Hilbert's 17th Problem, Charles N. Delzell

Faculty Publications

No matter how a positive semidefinite polynomial f ∈ ℝ[X1,...,Xn] is represented (according to E. Artin's 1926 solution to Hilbert's 17th problem) in the form f = ∑ piri2 (with 0 ≤ Pi ∈ ℝ and ri ∈ ℝ(X1,..., Xn), the pi and the coefficients of the ri cannot be chosen to depend in a C∞ (i.e., infinitely differentiable) manner upon the coefficients of f (unless deg f ≤, 2); formal powers series variation is also impossible. This answers a question we had raised in 1990 [Contemp. Math., vol. 155, Amer. Math. Soc., 1994, pp. 107-117], where we had already …

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Chasing The Albatross: Gendering Theory And Reading With Dual-Voiced Journals, Mary E. Styslinger May 2004

Chasing The Albatross: Gendering Theory And Reading With Dual-Voiced Journals, Mary E. Styslinger

Faculty Publications

No abstract provided.

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Control Strategies For Active Power Sharing In A Fuel-Cell-Powered Battery-Charging Station, Zhenhua Jiang, Roger A. Dougal May 2004

Control Strategies For Active Power Sharing In A Fuel-Cell-Powered Battery-Charging Station, Zhenhua Jiang, Roger A. Dougal

Faculty Publications

This paper presents an effective system design for a fuel-cell-powered battery-charging station and three control strategies for active power sharing among the batteries. This battery-charging station allows multiple batteries to be simultaneously charged. Three control strategies were investigated to coordinate the active power distribution among the battery-charging branches. The baseline control strategy Was equal rate charging. Two advanced control strategies, proportional rate charging and pulse current charging, were compared to the baseline strategy. These control strategies were realized in MaTLaB/Simulink, and the current and voltage regulations were implemented using the classical proportional-integral control approach. The system simulation was conducted in …

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Examining The Relationship Between Religious Orientation And Eating Disturbances, Melissa H. Smith, P. Scott Richards, Christopher J. Maglio May 2004

Examining The Relationship Between Religious Orientation And Eating Disturbances, Melissa H. Smith, P. Scott Richards, Christopher J. Maglio

Faculty Publications

The relationship between religion and eating concerns is receiving increasing empirical attention. The current investigation sought to examine the relationship between eating attitudes and religious orientation, utilizing the fourfold typology of religious orientation. A curvilinear relationship was found between religious orientation and eating attitudes among a subclinical college population and a clinical population of individuals receiving inpatient treatment for eating disorders, particularly among extrinsically orientated individuals with diagnosis of bulimia nervosa.

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Discerning Trends, Contours, And Boundaries In Comparative Education: A Survey Of Comparativists And Their Literature, Steven J. Hite, Bradley J. Cook, Erwin H. Epstein May 2004

Discerning Trends, Contours, And Boundaries In Comparative Education: A Survey Of Comparativists And Their Literature, Steven J. Hite, Bradley J. Cook, Erwin H. Epstein

Faculty Publications

Surely the health and vitality of any academic field relies on the periodic review of its intellectual history, evolving theoretical frameworks, and thematic shifts. Attempts to define a field typically involve lively debates over boundary maintenance. Indeed, the question of whether cooperative education is a "discipline" has been debated at least since the earliest issues of the Comparative Education Review and has continued to be debated in different forums. Leon Tikly and Michael Crossley believe that a comparative and international canon is discernible, although it is one that is "continually being challenged by new theories and approaches from the arts, …

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A Politically Viable Approach To Sovereign Debt Restructuring, A. Mechele Dickerson May 2004

A Politically Viable Approach To Sovereign Debt Restructuring, A. Mechele Dickerson

Faculty Publications

The failure to enact a statutory system to restructure sovereign debt suggests that the international community is still unwilling to adopt a unified global response to insolvency issues. Since nations refused to enact uniform legislation to facilitate more orderly business insolvencies within a sovereign, it is not surprising that recent attempts to create uniform legislation that addresses the insolvency of sovereigns themselves have been unsuccessful. While a comprehensive statutory approach can predictably and efficiently restructure all of a sovereign's debts, the failed experience with uniform cross-border insolvency legislation suggests that sovereigns will not accept an inflexible statutory scheme that contains …

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Identification Of An Il-17-Producing Nk1.1neg Inkt Cell Population Involved In Airway Neutrophilia, Paul B. Savage, Marie-Laure Michel, Alexandre Castro Keller, Christophe Paget, Masakazu Fujio, Francois Trottein, Chi-Huey Wong, Elke Schneider, Michael Dy, Maria C. Leite-De-Moraes Apr 2004

Identification Of An Il-17-Producing Nk1.1neg Inkt Cell Population Involved In Airway Neutrophilia, Paul B. Savage, Marie-Laure Michel, Alexandre Castro Keller, Christophe Paget, Masakazu Fujio, Francois Trottein, Chi-Huey Wong, Elke Schneider, Michael Dy, Maria C. Leite-De-Moraes

Faculty Publications

Invariant natural killer T (iNKT) cells are an important source of both T helper type 1 (Th1) and Th2 cytokines, through which they can exert beneficial, as well as deleterious, effects in a variety of inflammatory diseases. This functional heterogeneity raises the question of how far phenotypically distinct subpopulations are responsible for such contrasting activities. In this study, we identify a particular set of iNKT cells that lack the NK1.1 marker (NK1.1neg) and secrete high amounts of interleukin (IL)-17 and low levels of interferon (IFN)-{gamma} and IL-4. NK1.1neg iNKT cells produce IL-17 upon synthetic ({alpha}-galactosylceramide [{alpha}-GalCer] or PBS-57), as well …

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Quality At Time Of Purchase Of Dried Milk Products Commercially Packaged In Reduced Oxygen Atmosphere, Michelle A. Lloyd, J. Zou, H. Farnsworth, Oscar A. Pike Apr 2004

Quality At Time Of Purchase Of Dried Milk Products Commercially Packaged In Reduced Oxygen Atmosphere, Michelle A. Lloyd, J. Zou, H. Farnsworth, Oscar A. Pike

Faculty Publications

Nonfat dry milk (NDM) and powdered whey beverages are available at the retail level, packaged in No. 10 cans in a reduced oxygen atmosphere to prolong shelf life. The objective of this research was to determine the sensory and nutritional quality of these dried milk products at the time of purchase. In the 10 brands tested, wide variation existed in headspace oxygen, can seam quality, sensory quality, and vitamin A (with 6 of 10 brands entirely lacking the vitamin). Manufacturers of dried milk products packaged in cans for long-term storage need to give careful attention to can seam quality, product …

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Removing Surface Contaminants From Silicon Wafers To Facilitate Euv Optical Characterization, Richard L. Sandberg, David D. Allred, A. L. Jackson, J. E. Johnson, W. Evans, T. Doughty, A. E. Baker, K. Adamson, A. Jacquier, R. E. Robinson Apr 2004

Removing Surface Contaminants From Silicon Wafers To Facilitate Euv Optical Characterization, Richard L. Sandberg, David D. Allred, A. L. Jackson, J. E. Johnson, W. Evans, T. Doughty, A. E. Baker, K. Adamson, A. Jacquier, R. E. Robinson

Faculty Publications

The extreme ultraviolet (EUV) is becoming increasingly important. Principal applications include orbital space-based astronomy and lithography for integrated circuit computer chips. A main impediment to further development of efficient mirrors is the lack of reliable optical constants for various materials in this region of the electromagnetic spectrum. One reason for the unreliability of the optical constants is that the sample surfaces are often contaminated with foreign material, especially organic compounds, when exposed to laboratory air. Several cleaning techniques were evaluated, namely: 1) strippable solid optical cleaner (Opticlean®); 2) oxygen plasma etch; 3) high energy UV light/ozone; 4) strippable coating followed …

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On Noncoherent Detection Of Cpm, Michael D. Rice, Erik Perrins Apr 2004

On Noncoherent Detection Of Cpm, Michael D. Rice, Erik Perrins

Faculty Publications

This work was supported under a grant from the Air Force ARTM program (Contracts F04700-02-P-0080 and F04700-02-P-0081). It is well understood that the performance of noncoherent receivers with multi-symbol observation intervals approaches that of coherent receivers as the observation interval grows arbitrarily large. However, since complexity also grows exponentially with observation length, there are practical limits to this approach. In this paper we present a noncoherent receiver for continuous phase modulation (CPM) whose structure is a hybrid between existing coherent and noncoherent receiver architectures. The presentation is given in the most general M-ary multi-h terms, with some emphasis on the …

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Molecular-Dynamics Simulation Of The Effect Of Ions On A Liquid–Liquid Interface For A Partially Miscible Mixture, Richard L. Rowley, Kent E. Wardle, Eric Carlson, Douglas Henderson Apr 2004

Molecular-Dynamics Simulation Of The Effect Of Ions On A Liquid–Liquid Interface For A Partially Miscible Mixture, Richard L. Rowley, Kent E. Wardle, Eric Carlson, Douglas Henderson

Faculty Publications

Molecular-dynamics simulations were performed to model the effect of added salt ions on the liquid-liquid interface in a partially miscible system. Simulations of the interface between saturated phases of a model 1-hexanol + water system show a bilayer structure of 1-hexanol molecules at the interface with OH heads of the first layer directed into the water phase and the opposite orientation for the second layer. The alignment of the polar OH groups at the interface stabilizes a charge separation of sodium and chloride ions when salt is introduced into the aqueous phase, producing an electrical double layer. Chloride ions aggregate …

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