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1,489 Matching Results

Start Over Year 2004

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(open access)

"Respect is active like an organism that is not only cumulative but has a very personal effect": A grounded theory methodology of a respect communication model in the college classroom.

This study examined the notion of respect in the college classroom. While pedagogical researchers had previously studied the phenomenon, each found challenges in defining it. Moreover, communication scholars do not examine respect as a primary pedagogical factor with learning implications. Focus groups provided venues for topic-specific discussion necessary for better understanding the diversity of students' worldviews regarding respect in the college classroom. Grounded theory allowed for searching theoretical relevance of the phenomenon through constant comparison with categorical identification. The most practical contributions of this research identifies as several major notions including, the importance of relationships within the process, student self-esteem, and global-classroom respect. In addition, implications emerged from the data as learning, motivation, and environment. One other practical contribution exists as a respect communication model for the college classroom. Further, examining students' worldviews of respect in the classroom provides benefits for pedagogical scholars, students, and instructors.

Date: August 2004

Creator: Martinez, Alma

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

Communication patterns and allocation strategies.

Motivated by observations about job runtimes on the CPlant system, we use a trace-driven microsimulator to begin characterizing the performance of different classes of allocation algorithms on jobs with different communication patterns in space-shared parallel systems with mesh topology. We show that relative performance varies considerably with communication pattern. The Paging strategy using the Hilbert space-filling curve and the Best Fit heuristic performed best across several communication patterns.

Date: January 1, 2004

Creator: Leung, Vitus Joseph; Mache, Jens Wolfgang & Bunde, David P.

Object Type: Report

System: The UNT Digital Library

(open access)

Position Estimation of Transceivers in Communication Networks

With rapid developments in wireless sensor networks, there is a growing need for transceiver position estimation independent of GPS, which may not be available in indoor networks. Our approach is to use range estimates from time-of-flight (TOF) measurements, a technique well suited to large bandwidth physical links, such as in ultra-wideband (UWB) systems. In our UWB systems, pulse duration less than 200 psecs can easily be resolved to less than a foot. Assuming an encoded UWB physical layer, we first test positioning accuracy using simulations. We are interested in sensitivity to range errors and the required number of ranging nodes, and we show that in a high-precision environment, such as UWB, the optimal number of transmitters is four. Four transmitters with {+-}20ft. range error can locate a receiver to within one or two feet. We then implement these algorithms on an 802.11 wireless network and demonstrate the ability to locate a network access point to approximately 20 feet.

Date: January 20, 2004

Creator: Dowla, F. & Kent, C.

Object Type: Article

System: The UNT Digital Library

(open access)

Understanding communication in counterterrorism crisis management.

This report describes the purpose and results of the two-year, Sandia-sponsored Laboratory Directed Research and Development (LDRD) project entitled Understanding Communication in Counterterrorism Crisis Management The purpose of this project was to facilitate the capture of key communications among team members in simulated training exercises, and to learn how to improve communication in that domain. The first section of this document details the scenario development aspects of the simulation. The second section covers the new communication technologies that were developed and incorporated into the Weapons of Mass Destruction Decision Analysis Center (WMD-DAC) suite of decision support tools. The third section provides an overview of the features of the simulation and highlights its communication aspects. The fourth section describes the Team Communication Study processes and methodologies. The fifth section discusses future directions and areas in which to apply the new technologies and study results obtained as a result of this LDRD.

Date: October 1, 2004

Creator: Djordjevich, Donna D.; Barr, Pamela K.; Arnold, Jason Darrel; Johnson, Michael M.; Sa, Timothy J.; Hawley, Marilyn F. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

JAC: A Journal of Composition Theory, Volume 24, Number 4, 2004

JAC: A Journal of Composition Theory contains a collection of papers regarding writing and rhetoric: "The JAC is a forum for theory, research and pedagogy regarding (1) those writing courses beyond the freshman courses, excluding technical and creative writing, (2) writing in courses which are not themselves writing courses, particularly in the liberal arts and sciences, and (3) work in theory, research or pedagogy which is advanced or progressive and will shed light on the field as a whole while at the same time providing insights for advanced composition" (volume 1, number 1).

Date: 2004

Creator: Association of Teachers of Advanced Composition (U.S.)

Object Type: Journal/Magazine/Newsletter

System: The UNT Digital Library

(open access)

JAC: A Journal of Composition Theory, Volume 24, Number 3, 2004

Date: 2004

Creator: Association of Teachers of Advanced Composition (U.S.)

Object Type: Journal/Magazine/Newsletter

System: The UNT Digital Library

(open access)

JAC: A Journal of Composition Theory, Volume 24, Number 2, 2004

Date: 2004

Creator: Association of Teachers of Advanced Composition (U.S.)

Object Type: Journal/Magazine/Newsletter

System: The UNT Digital Library

(open access)

Pathways, Networks, and Systems: Theory and Experiments

The international conference provided a unique opportunity for theoreticians and experimenters to exchange ideas, strategies, problems, challenges, language and opportunities in both formal and informal settings. This dialog is an important step towards developing a deep and effective integration of theory and experiments in studies of systems biology in humans and model organisms.

Date: October 30, 2004

Creator: Nadeau, Joseph H. & Lambris, John D.

Object Type: Article

System: The UNT Digital Library

Instigating a Necessary Epiphany in Visual Message-Making for Design Educators and Future Communication Designers

Access: Use of this item is restricted to the UNT Community

Man has used graphic signs and symbols to express a variety of thoughts and feelings since before the invention of writing; they have helped him to preserve the ideologies that have enabled him to articulate his conception of the world. Every culture in every historical era has invested the objects, animals and plants around it with a multitude of different psychological meanings to communicate its essential belief systems and social aspirations. In my document, I chose to shed light on the responsibility I believe design educators must assume regarding their ability to understand and teach the importance of how similar graphic signs, symbols, ideograms and icons are perceived differently by different cultures in the hyper-connected, inter-global economy of 21st century. It is very crucial not to discount the influence and correlation of symbolic, fundamental building blocks of design with the basic psychological functions that inform our subconscious, and are also informed by our individual social and cultural upbringings. People from different cultures may cognate these shapes similarly, but they perceive and encode their meanings based on their particular social and cultural influences. One-size-fits-all communication design solutions rarely work, especially when they are distributed to culturally diverse audiences, because various ethnic …

Date: May 2004

Creator: Sarkaria, Gagandeep

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

Theory Of Alkyl Terminated Silicon Quantum Dots

We have carried out a series of ab-initio calculations to investigate changes in the optical properties of Si quantum dots as a function of surface passivation. In particular, we have compared hydrogen passivated dots with those having alkyl groups at the surface. We find that, while on clusters with reconstructed surfaces a complete alkyl passivation is possible, steric repulsion prevents full passivation of Si dots with unreconstructed surfaces. In addition, our calculations show that steric repulsion may have a dominant effect in determining the surface structure, and eventually the stability of alkyl passivated clusters, with results dependent on the length of the carbon chain. Alkyl passivation weakly affects optical gaps of silicon quantum dots, while it substantially decreases ionization potentials and electron affinities and affect their excited state properties. On the basis of our results we propose that alkyl terminated quantum dots may be size selected taking advantage of the change in ionization potential as a function of the cluster size.

Date: August 19, 2004

Creator: Reboredo, F & Galli, G

Object Type: Article

System: The UNT Digital Library

(open access)

The Sandia GeoModel : theory and user's guide.

The mathematical and physical foundations and domain of applicability of Sandia's GeoModel are presented along with descriptions of the source code and user instructions. The model is designed to be used in conventional finite element architectures, and (to date) it has been installed in five host codes without requiring customizing the model subroutines for any of these different installations. Although developed for application to geological materials, the GeoModel actually applies to a much broader class of materials, including rock-like engineered materials (such as concretes and ceramics) and even to metals when simplified parameters are used. Nonlinear elasticity is supported through an empirically fitted function that has been found to be well-suited to a wide variety of materials. Fundamentally, the GeoModel is a generalized plasticity model. As such, it includes a yield surface, but the term 'yield' is generalized to include any form of inelastic material response including microcrack growth and pore collapse. The geomodel supports deformation-induced anisotropy in a limited capacity through kinematic hardening (in which the initially isotropic yield surface is permitted to translate in deviatoric stress space to model Bauschinger effects). Aside from kinematic hardening, however, the governing equations are otherwise isotropic. The GeoModel is a genuine unification …

Date: August 1, 2004

Creator: Brannon, Rebecca Moss & Fossum, Arlo Frederick

Object Type: Report

System: The UNT Digital Library

(open access)

National Park Foundation: Better Communication of Roles and Responsibilities Is Needed to Strengthen Partnership with the National Park Service

A letter report issued by the General Accounting Office with an abstract that begins "In 1967, the Congress created the National Park Foundation (Foundation)--a nonprofit organization with the sole purpose of providing private support to the National Park Service (Park Service). However, some Park Service officials have raised concerns that the Foundation's support is not meeting parks' priority needs. In this context, congressional requesters asked GAO to review the activities of the Foundation by determining the (1) Foundation's roles and responsibilities for raising funds to support the Park Service, (2) amount and kinds of donations the Foundation has raised between fiscal years 1999 and 2003, and (3) extent to which the contributions obtained by the Foundation assisted the Park Service in addressing park priorities."

Date: May 17, 2004

Creator: United States. General Accounting Office.

Object Type: Report

System: The UNT Digital Library

(open access)

The Impact of Downsizing on Survivors' Career Development: A Test of Super's Theory

The present study compared the career development concerns and other vocationally relevant variables of employees of organizations who have and have not engaged in downsizing within a one year timeframe. The sample consisted of 162 participants, 72 layoff survivors (those who remained in an organization after its downsizing) and 92 non-survivors (employees in organizations who have not downsized within 12 months). Significant results were found that differentiated the career related experiences of participants in the survivors group, survivors from non-survivors, and participants in general regardless of survivorship status. In general, results indicated that non-survivors reported greater job satisfaction and job security than layoff survivors, that being married with children may increase job satisfaction, and social support may buffer the grief reactions that survivors have to the loss of their co-worker friends. Furthermore, Super's age-associated stages within the Life-Span, Life-Space Theory were moderately upheld in the sample, especially for the Exploration stage. However, younger workers demonstrated more Maintenance concerns that would be predicted by the theory. A discussion of the relevant literature is included as well as possible explanations of the results, small sample size, and implications for future research.

Date: August 2004

Creator: Lahner, Jessica M.

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

The Tevatron tune tracker pll - theory, implementation and measurements

The Tevatron tune tracker is based on the idea that the transverse phase response of the beam can be measured quickly and accurately enough to allow us to track the betatron tune with a phase locked loop (PLL). The goal of this paper is to show the progress of the PLL project at Fermilab. We will divide this paper into three parts: theory, implementation and measurements. In the theory section, we will use a simple linear model to show that our design will track the betatron tune under conditions that occur in the Tevatron. In the implementation section we will break down and examine each part of the PLL and in some cases calculate the actual PLL parameters used in our system from beam measurements. And finally in the measurements section we will show the results of the PLL performance.

Date: December 1, 2004

Creator: Tan, Cheng-Yang

Object Type: Report

System: The UNT Digital Library

(open access)

2nd International Conference on Pathways, Networks, and Systems: Theory and Experiments

With the availability of whole genome sequences, research attention shifts from gene sequences and genome content to protein functions and systems biology. Genes comprise a major component of the ''parts list'' that is required for building and maintaining of living organisms. Genome DNA sequences reveal the genetic inventory for a rapidly increasing number of species. Defining and interpreting the instruction manual for protein functions, individually and collectively, is the emerging challenge. Defining protein functions is a complex problem because each gene typically encodes several distinct proteins. As a result, the protein inventory includes as many as 100,000 distinct proteins. Protein functions can vary with developmental stage, anatomical location, and environmental context. Like the problem of sequencing the human genome, the multidimensional nature of protein functions in time, space and context constitutes one of the ''big'' problems in biomedical research. Resolving this problem is key to revolutionizing health care where a deep understanding of complex biological systems will lead to more powerful and specific ways to treat, and perhaps, even prevent birth defects and adult diseases. The meeting addressed the above issues.

Date: October 1, 2004

Creator: Aegean Conferences

Object Type: Article

System: The UNT Digital Library

(open access)

Electron-Cloud Simulation and Theory for High-Current Heavy-Ion Beams

Stray electrons can arise in positive-ion accelerators for heavy ion fusion or other applications as a result of ionization of ambient gas or gas released from walls due to halo-ion impact, or as a result of secondary- electron emission. We summarize the distinguishing features of electron cloud issues in heavy-ion-fusion accelerators and a plan for developing a self-consistent simulation capability for heavy-ion beams and electron clouds. We also present results from several ingredients in this capability: (1) We calculate the electron cloud produced by electron desorption from computed beam-ion loss, which illustrates the importance of retaining ion reflection at the walls. (2) We simulate of the effect of specified electron cloud distributions on ion beam dynamics. We consider here electron distributions with axially varying density, centroid location, or radial shape, and examine both random and sinusoidally varying perturbations. We find that amplitude variations are most effective in spoiling ion beam quality, though for sinusoidal variations which match the natural ion beam centroid oscillation or breathing mode frequencies, the centroid and shape perturbations can also have significant impact. We identify an instability associated with a resonance between the beam-envelope ''breathing'' mode and the electron perturbation. We estimate its growth rate, which …

Date: July 26, 2004

Creator: Cohen, R; Friedman, A; Lund, S; Molvik, A; Lee, E; Azevedo, T et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Dependence in probabilistic modeling, Dempster-Shafer theory, and probability bounds analysis.

This report summarizes methods to incorporate information (or lack of information) about inter-variable dependence into risk assessments that use Dempster-Shafer theory or probability bounds analysis to address epistemic and aleatory uncertainty. The report reviews techniques for simulating correlated variates for a given correlation measure and dependence model, computation of bounds on distribution functions under a specified dependence model, formulation of parametric and empirical dependence models, and bounding approaches that can be used when information about the intervariable dependence is incomplete. The report also reviews several of the most pervasive and dangerous myths among risk analysts about dependence in probabilistic models.

Date: October 1, 2004

Creator: Oberkampf, William Louis; Tucker, W. Troy (Applied Biomathematics, Setauket, NY); Zhang, Jianzhong (Iowa State University, Ames, IA); Ginzburg, Lev (Applied Biomathematics, Setauket, NY); Berleant, Daniel J. (Iowa State University, Ames, IA); Ferson, Scott (Applied Biomathematics, Setauket, NY) et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Induced Polarization With Electromagnetic Coupling: 3D Spectral Imaging Theory: EMSP Project No. 73836

The principal objective of the project was to develop a non-invasive imaging technique, based on spectral induced polarization (SIP), to characterize in-situ distribution of organic and inorganic contaminants. This was to be an advance over a similar technique offered by the DC resistivity method. The motivation for the choice of IP over resistivity is rooted in the fact that resistivity response is governed by volume distributions of electrical parameters and therefore is relatively insensitive to small changes contributed by the presence of contaminants. IP response on the other hand is governed by the electrochemical properties of the rock-grain pore-fluid interface, which can be significantly altered by the incoming contaminant (ions) over long residence times. Small concentrations of contaminants are the rule rather than the exception thus, the detection threshold for IP, which is more sensitive to small concentrations, is much lower than for resistivity (IP field threshold for PCE/TCE is about 1mg/g). Additionally, the observation that IP depends on the chemistry of the contaminants provided the motivation that a spectral IP response could lead to a database of identifying signatures by which contaminants can be discriminated.

Date: December 31, 2004

Creator: Morgan, F. Dale & Lesmes, David

Object Type: Report

System: The UNT Digital Library

(open access)

Induced Polarization with Electromagnetic Coupling: 3D Spectral Imaging Theory, EMSP Project No. 73836

This project was designed as a broad foundational study of spectral induced polarization (SIP) for characterization of contaminated sites. It encompassed laboratory studies of the effects of chemistry on induced polarization, development of 3D forward modeling and inversion codes, and investigations of inductive and capacitive coupling problems. In the laboratory part of the project a physico-chemical model developed in this project was used to invert laboratory IP spectra for the grain size and the effective grain size distribution of the sedimentary rocks as well as the formation factor, porosity, specific surface area, and the apparent fractal dimension. Furthermore, it was established that the IP response changed with the solution chemistry, the concentration of a given solution chemistry, valence of the constituent ions, and ionic radius. In the field part of the project, a 3D complex forward and inverse model was developed. It was used to process data acquired at two frequencies (1/16 Hz and 1/ 4Hz) in a cross-borehole configuration at the A-14 outfall area of the Savannah River Site (SRS) during March 2003 and June 2004. The chosen SRS site was contaminated with Tetrachloroethylene (TCE) and Trichloroethylene (PCE) that were disposed in this area for several decades till the …

Date: December 14, 2004

Creator: Morgan, F. Dale & Sogade, John

Object Type: Report

System: The UNT Digital Library

(open access)

Robust message routing for mobile (wireless) ad hoc networks.

This report describes the results of research targeting improvements in the robustness of message transport in wireless ad hoc networks. The first section of the report provides an analysis of throughput and latency in the wireless medium access control (MAC) layer and relates the analysis to the commonly used 802.11 protocol. The second section describes enhancements made to several existing models of wireless MAC and ad hoc routing protocols; the models were used in support of the work described in the following section. The third section of the report presents a lightweight transport layer protocol that is superior to TCP for use in wireless networks. In addition, it introduces techniques that improve the performance of any ad hoc source routing protocol. The fourth section presents a novel, highly scalable ad hoc routing protocol that is based on geographic principles but requires no localization hardware.

Date: January 1, 2004

Creator: Goldsby, Michael E.; Johnson, Michael M.; Kilman, Dominique Marie (Sandia National Laboratories, Albuquerque, NM); Bierbaum, Neal Robert; Chen, Helen Y.; Ammerlahn, Heidi R. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Cyberbullying: When Bullies Follow You Home.

Researchers have studied adolescent bullying behavior since the 1970s, however, today's technological advances have opened the door to a new form of abuse. Teens can no longer escape the wrath of their bullies once they have left the school grounds, because bullies are following them home. Cyberbullying is a new phenomenon in which bullies use computer-mediated communication (CMC) to torment their victims. This research project focused on uncovering some of the mysteries surrounding this new means of bullying. A grounded theory analysis of stories written by victims revealed cyberbullies often use synchronous chat tools, e-mail, web sites, and cell phone text messages to reach their victims. Data analysis also revealed victims use of contextualization, descriptions of their bullying episodes, and discussions of their responses and outcomes to characterize their experiences. Interestingly, the researcher found victims of cyberbullying generally were also victims off face-to-face bullying as well.

Date: August 2004

Creator: Phillips Newton, Ann E.

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

The role of technology in reducing health care costs. Phase II and phase III.

In Phase I of this project, reported in SAND97-1922, Sandia National Laboratories applied a systems approach to identifying innovative biomedical technologies with the potential to reduce U.S. health care delivery costs while maintaining care quality. The effort provided roadmaps for the development and integration of technology to meet perceived care delivery requirements and an economic analysis model for development of care pathway costs for two conditions: coronary artery disease (CAD) and benign prostatic hypertrophy (BPH). Phases II and III of this project, which are presented in this report, were directed at detailing the parameters of telemedicine that influence care delivery costs and quality. These results were used to identify and field test the communication, interoperability, and security capabilities needed for cost-effective, secure, and reliable health care via telemedicine.

Date: April 1, 2004

Creator: Cilke, John F.; Parks, Raymond C.; Funkhouser, Donald Ray; Tebo, Michael A.; Murphy, Martin D.; Hightower, Marion Michael et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Landau Damping and Anomalous Skin Effect in Low-pressure Gas Discharges: Self-consistent Treatment of Collisionless Heating

In low-pressure discharges, where the electron mean free path is larger or comparable with the discharge length, the electron dynamics is essentially nonlocal. Moreover, the electron energy distribution function (EEDF) deviates considerably from a Maxwellian. Therefore, an accurate kinetic description of the low-pressure discharges requires knowledge of the nonlocal conductivity operator and calculation of the non-Maxwellian EEDF. The previous treatments made use of simplifying assumptions: a uniform density profile and a Maxwellian EEDF. In the present study a self-consistent system of equations for the kinetic description of nonlocal, nonuniform, nearly collisionless plasmas of low-pressure discharges is reported. It consists of the nonlocal conductivity operator and the averaged kinetic equation for calculation of the non-Maxwellian EEDF. This system was applied to the calculation of collisionless heating in capacitively and inductively coupled plasmas. In particular, the importance of accounting for the nonuniform plasma density profile for computing the current density profile and the EEDF is demonstrated. The enhancement of collisionless heating due to the bounce resonance between the electron motion in the potential well and the external radio-frequency electric field is investigated. It is shown that a nonlinear and self-consistent treatment is necessary for the correct description of collisionless heating.

Date: January 30, 2004

Creator: Kaganovich, Igor D.; Polomarov, Oleg V. & Theodosiou, Constantine E.

Object Type: Report

System: The UNT Digital Library

(open access)

An Observational Investigation of On-Duty Critical Care Nurses' Information Behavior in a Nonteaching Community Hospital

Critical care nurses work in an environment rich in informative interactions. Although there have been post hoc self-report survey studies of nurses' information seeking, there have been no observational studies of the patterns and content of their on-duty information behavior. This study used participant observation and in-context interviews to describe 50 hours of the observable information behavior of a representative sample of critical care nurses in a 20-bed critical care hospital unit. The researcher used open, in vivo, and axial coding to develop a grounded theory model of their consistent pattern of multimedia interactions. The resulting Nurse's Patient-Chart Cycle describes nurses' activities during the shift as centering on a regular alternation with the patient and the patient's chart (various record systems), clearly bounded with nursing "report" interactions at the beginning and the end of the shift. The nurses' demeanor markedly changed between interactions with the chart and interactions with the patient. Other informative interactions were observed with other health care workers and the patient's family, friends and visitors. The nurses' information seeking was centered on the patient. They mostly sought information from people, the patient record and other digital systems. They acted on or passed on most of the information …

Date: May 2004

Creator: McKnight, Michelynn

Object Type: Thesis or Dissertation

System: The UNT Digital Library

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