Digital Commons Network^™

An Improved Simulation Model For Spaceborne Scatterometer Measurements, David G. Long, Peter K. Yoho

Faculty Publications

Development of scatterometer designs and applications requires extensive data simulation. The advancing capabilities of instruments motivates our proposal for an improved simulation model for noisy scatterometer measurements. Previous simulation models do not separately account for the two forms of random variation - signal fading and additive noise - which affect scatterometer measurements. The proposed model is able to generate data that are statistically equivalent (in a mean and variance sense) to actual instrument measurements by accounting for both variations, while maintaining ease of implementation. The model is particularly adept at handling design tradeoffs related to signal-to-noise ratios by appropriately separating …

Synergetic Control For Dc-Dc Boost Converter: Implementation Options, Enrico Santi, Antonello Monti, Donghong Li, Karthik Proddutur, Roger A. Dougal

Faculty Publications

The theory of synergetic control was introduced in a power electronics context in a previous paper. In this paper, we review the theory, then focus on some practical aspects with reference to both simulations and actual hardware. In particular, we address management of the current limit condition and solve it with several different approaches. Adaptive and other control laws are also introduced to improve the control performance. The various controls are evaluated by applying the classical voltage reference step test and the step load test.

Ordering Tendencies In Octahedral Mgo-Zno Alloys, Gus L. W. Hart, Mahdi Sanati, Alex Zunger

Faculty Publications

Isostrutural II-VI alloys whose components are either rocksalt stable (e.g., CaO-MgO) or zincblende stable (e.g., ZnS-ZnSe) are known to be thermodynamically unstable at low temperatures, showing a miscibility gap and no bulk ordering. In contrast, we show that heterostructural MgO-ZnO is stable, under certain conditions, in the sixfold-coordinated structure for Zn concentrations below 67%, giving rise to spontaneously ordered alloys. Using first-principles calculations, we explain the origin of this stability, the structures of their low-temperature ordered phases, short-range-order patterns, and their optical band-gap properties.

Allowed Mesoscopic Point Group Symmetries In Domain Average Engineering Of Perovskite Ferroelectric Crystals, Dorian M. Hatch, H. T. Stokes, W. Cao

Faculty Publications

In multivariant systems, several energetically degenerate low temperature domain states can be produced at the structural phase transition. Coexistence of these domain states can produce mesoscopic structures that possess symmetries distinct from the microscopic single domain crystal symmetry. Such engineered domain structures in certain ferroelectric materials have been proven to give superior piezoelectric properties and extremely soft shear moduli. The objective of this article is to consider the variety of symmetries that can be produced through domain average engineering in proper ferroelectric systems arising from the cubic Pm[overline 3]m symmetry perovskite structure.

Predictive Joint Motion Limiting In Robotic Applications, Edward Red, Brian Fielding

Faculty Publications

Three joint space algorithms slow the Cartesian path motion when it appears that joint motion is approaching a joint, speed, or acceleration limit. All three algorithms use quadratic curve fitting to predict where the joint motion is heading, followed by a prediction as to how much time would elapse until a limit is reached.

Preaching The David Story, Rolf A. Jacobson

Faculty Publications

The David story is the longest and most complete biblical treatment of any one human life. This allows the story to speak to many stages of the faith journey. The story is not fully present in the pericopes, but the preacher can choose to use this material in a sermon series to address the spiritual and moral contexts of our age.

Pay Secrecy/ Confidentiality Rules And The National Labor Relations Act, Rafael Gely, Leonard Bierman

Faculty Publications

This article seeks to provide a comprehensive account of doctrinal issues related to the use of pay secrecy/confidentiality rules (“PSC rules”) under the NLRA. In Part II, we describe what pay secrecy/confidentiality is and discuss recent survey evidence of their presence in workplaces across the United States. In Part III, we describe the current legal framework under which PSC rules are evaluated under the NLRA, while in Parts IV and V, we explore various doctrinal issues related to these rules in more detail. This leads us to Part VI, where we ponder the future of PSC rules under the NLRA …

World Religions And The Vegetarian Diet, Jo Ann Davidson

Faculty Publications

No abstract provided.

Cultural Variations Of Internet Development And Use, Hong Xu, Bin Li, Silvia Barcellos Southwick, Anita Komlodi, Tracy Haidar

Faculty Publications

We are rapidly constructing a global network infrastructure for moving information across national boundaries. Is there a universal way of developing and using the Internet across different geographic areas with different culture? The first panelist in this session will discuss cultural, economic, political systems differences between United States and China in Internet development and Internet use. Second presentation will focus on cultural and social issues in adopting Internet technology in Brazil. The next two presentations will examine how cultural background affects information seeking behavior of Web users from different culture.

Un Glossario Bernense, Scott Gwara

Faculty Publications

No abstract provided.

Long Memory Inflationary Dynamics: The Case Of Brazil, Mark E. Jensen, Valderio A. Reisen, Francisco Cribari-Neto

Faculty Publications

It has been argued by several authors that the inflationary dynamics in Brazil follow a unit root process, thus displaying some inertia. Indeed, Cati, et al. (Journal of Applied Econometrics, 1999) have found that the inflationary dynamics in Brazil are nearly fully inertial. We estimate the fractional differencing parameter using an ARFIMA specification for the inflation rate in that country and our results suggest that the inflationary dynamics are better modeled by a long memory process than by a unit root mechanism, thus implying that there is no inertia in inflation, contrary to what has been found by other researchers. …

Public Child Welfare And The American Indian: A California Profile, Gordon E. Limb, Robin Perry

Faculty Publications

Historically, American Indians have been disproportionately represented in public child welfare services. This article reports findings from a survey of all public child welfare workers in California (N= 5,741) in 1998. A descriptive profile of American Indian clients (where they reside and who works with them) and American Indian child welfare workers ( n= 1 71) is detailed. Attempts are made to identify counties with a disproportionately high number of American Indians represented on public child welfare caseloads and to estimate the probability that an American Indian worker would have a higher proportion of American Indians on his or her …

An Evening To Remember, Ivan Davis

Faculty Publications

No abstract provided.

Developing And Implementing A State Assessment Program, Judith E. Rink, Lori Williams

Faculty Publications

No abstract provided.

Insights And Reflections On A State Assessment Program, Judith E. Rink, Susan Stewart

Faculty Publications

No abstract provided.

Student Performance Data, School Attributes And Relationships, Murrary F. Mitchell, Darla M. Castelli, Skip Strainer

Faculty Publications

No abstract provided.

Instructional Variables And Student Knowledge And Conceptions Of Fitness, Susan E. Stewart, Murrary F. Mitchell

Faculty Publications

No abstract provided.

The Risks Of Professionalizing Local History: The Campaign To Suppress My Book, Robert R. Weyeneth

Faculty Publications

No abstract provided.

Physical Activity And Stroke Risk: A Meta-Analysis, Chong Do Lee, Aaron R. Folsom, Steven N. Blair

Faculty Publications

Background and Purpose - Whether physical activity reduces stroke risk remains controversial. We used a meta-analysis to examine the overall association between physical activity or cardiorespiratory fitness and stroke incidence or mortality.

Methods - We searched MEDLINE from 1966 to 2002 and identified 23 studies (18 cohort and 5 case-control) that met inclusion criteria. We estimated the overall relative risk (RR) of stroke incidence or mortality for highly and moderately active individuals versus individuals with low levels of activity using the general variance-based method.

Results - The meta-analysis documented that there was a reduction in stroke risk for active or …

Follow The Worker, Not The Work: Hard Lessons From Failed London Music Hall Magazines, Scott B. Fosdick

Faculty Publications

London’s music hall stages and the variety entertainment that flourished there at the turn of the 20th century gave rise to a raft of magazines hopeful of gaining an audience from fans and/or performers and theater managers. Some flourished for a time, but all died with the artform, unlike their American cousin, Variety, which still thrives nearly a century after its first issue. This article compares the founding missions of these magazines to that of Variety in search of guiding principles for magazine management, particularly of business publications, in industries undergoing rapid change. The conflict between two long-standing principles of …

Toward Common Content: An Analysis Of Online College And University Collecting Policies, Jennifer A. Marshall

Faculty Publications

Collecting policies have been advocated as tools to help archivists build stronger collections. The model proposed by Faye Phillips in 1984 is the most detailed framework for collecting policies in the archival literature. This paper presents the results of a pilot study of the collecting policies of college and university archives available online to investigate whether a consensus has been reached about the content of these documents. Future studies of this kind for other types of archives could facilitate the identification, refinement, and dissemination of professional best practice and standards for collecting policies.

Studying "Working Fathers": Comparing Fathers' And Mothers' Work-Family Conflict, Fit, And Adaptive Strategies In A Global High-Tech Company, E. Jeffrey Hill, Alan J. Hawkins, Vjollca Märtinson, Maria Ferris

Faculty Publications

Working fathers are underrepresented-conceptually and empirically-in work-family research. Using a global corporate sample of working fathers from 48 countries (N = 7,692), this study compares working fathers to working mothers on key work-family variables as suggested by Voydanoff's (2002) application of ecological systems theory. It examines the direction and the path of the predictors of work-family fit and whether a scarcity or expansion model better explains these results. Finally, it considers what work-family adaptive strategies may affect those relationships. Although fathers consistently reported less family-to-work conflict than mothers, they reported equal amounts of work-to-family conflict. That is, fathers struggled as …

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 …

W & M Law School Came First. Why Care?, W. Taylor Reveley Iii

Faculty Publications

No abstract provided.

Envisioning A Global Legal Culture, Charles H. Koch Jr.

Faculty Publications

No abstract provided.

Rhetorically Reasonable Police Practices: Viewing The Supreme Court's Multiple Discourse Paths, Kathryn R. Urbonya

Faculty Publications

This Article analyzes the United States Supreme Court's numerous and shifting rhetorical discourse paths for declaring whether particular governmental practices constituted unreasonable searches or seizures under the Fourth Amendment to the United States Constitution. It examines how the Court has manipulated classic discourse paths arising from text, history, precedent and structure. It reveals that among and within each of these categories, the Court has created conflicting approaches. The Article argues that the Court's construction of Fourth Amendment reasonableness has depended upon which discourse paths it has selected as well as how it has characterized the values embedded within the discourse …

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. …

Search For ΝΜ→ΝE Oscillations In The Nomad Experiment, Nomad Collaboration, P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, M. Banner, G. Bassompierre, K. Benslama, N. Besson, I. Bird, B. Blumenfeld, F. Bobisut, J. Bouchez, S. Boyd, A. Bueno, S. Buyatov, L. Camilleri, A. Cardini, P. W. Cattaneo, V. Cavasinni, Roberto Petti, Et. Al.

Faculty Publications

We present the results of a search for ν_µ → ν_e oscillations in the NOMAD experiment at CERN. The experiment looked for the appearance of ν_e in a predominantly ν_µ wide-band neutrino beam at the CERN SPS. No evidence for oscillations was found. The 90% confidence limits obtained are ∆m² < 0.4 eV² for maximal mixing and sin²(2θ)−3 for large ∆m². This result excludes the LSND allowed region of oscillation parameters with ∆m² ≳∆10 eV².

Trust Negotiation For Authentication And Authorization In Healthcare Information Systems, Charles D. Knutson, Kent E. Seamons, Tore L. Sundelin, David K. Vawdrey

Faculty Publications

The expanding availability of health information in an electronic format is strategic for industry-wide efforts to improve the quality and reduce the cnst of health care. The implementation of electronic medical record systems has been hindered by inadequate security provisions. This paper describes the use of frust negotiation as a framework for providing authentication and access control services in healthcare information systems. nust negotiation enables two parties with no pre-existing relationship to establish the trust necessary to perform sensitive transactions via the mutual disclosure of attributes contained within digital credentials. An extension of this system, surrogate irusf negoikiion is introduced …

Evaluating Tmr Techniques In The Presence Of Single Event Upsets, Paul S. Graham, Nathaniel Rollins, Michael J. Wirthlin, Michael P. Caffrey

Faculty Publications

Sponsorship: Los Alamos National Labs (LA-UR-03-7525). Field programmable gate arrays (FPGAs) are sensitive to radiation-induced single event upsets (SEUs) within the configuration memory. Triple modular redundancy (TMR) is a technique commonly used to mitigate against design failures caused by SEUs. This paper evaluates the effectiveness and cost of TMR on two different counter designs in the presence of SEUs. The evaluation measures the reliability, area cost, and speed of different TMR styles. The tests show that when feedback TMR is used with triplicated clocks, it is possible to have counter design which is insensitive to any single configuration upset.