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2007

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Cache Coherence Protocol Verification Using Ωmega, Ki Yung Ahn Jan 2007

Cache Coherence Protocol Verification Using Ωmega, Ki Yung Ahn

Computer Science Faculty Publications and Presentations

We verify some correctness properties of the DASH cache coherence protocol using Ωmega. Ωmega is a language with a rich type system featuring GADTs, type functions, and user-guided type checking rules. Cache coherence protocols have both safety properties and liveness properties. We show how to describe some of the safety properties of DASH cache coherence protocol in mega. Since liveness properties are not easily expressed by types, we investigate invariants sufficient to imply some of the liveness properties of concern, and assert those invariants as well in the type system of Ωmega. Using Ωmega, we can have both a working …

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Vortices And Chaos In The Quantum Fluid, D. A. Wisniacki, E. R. Pujals, F. Borondo Jan 2007

Vortices And Chaos In The Quantum Fluid, D. A. Wisniacki, E. R. Pujals, F. Borondo

Publications and Research

The motion of a single vortex originates chaos in the quantum fluid defined in Bohm's interpretation of quantum mechanics. Here we analize this situation in a very simple case: one single vortex in a rectangular billiard.

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Hierarchical Linear Modeling In Organizational Research: Longitudinal Data Outside The Context Of Growth Modeling, Irvin Sam Schonfeld, David Rindskopf Jan 2007

Hierarchical Linear Modeling In Organizational Research: Longitudinal Data Outside The Context Of Growth Modeling, Irvin Sam Schonfeld, David Rindskopf

Publications and Research

Organizational researchers, including those carrying out occupational stress research, often conduct longitudinal studies. Hierarchical linear modeling (HLM; also known as multilevel modeling and random regression) can efficiently organize analyses of longitudinal data by including within- and between-person levels of analysis. A great deal of longitudinal research has been conducted in the context of growth studies in which change in the dependent variable is examined in relation to the passage of time. HLM can treat longitudinal data, including data outside the context of the growth study, as nested data, reducing the problem of censoring. Within-person equation coefficients can represent the impact …

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Observation Of Microslip Dynamics At High-Speed Microcontacts, Brian Borovsky, Adam M. Booth, Erin Manlove Jan 2007

Observation Of Microslip Dynamics At High-Speed Microcontacts, Brian Borovsky, Adam M. Booth, Erin Manlove

Geology Faculty Publications and Presentations

The high-speed tribological properties of microscale contacts are studied using an indenter probe and quartz crystal microbalance. Elastic and dissipative shear forces are monitored as a function of contact radius for sapphire/gold interfaces with an adsorbed octadecanethiol monolayer. We observe shear force transitions understood as taking the interface from slipping to stuck conditions. We relate this behavior to the presence of interfacial microslip. Dynamic modeling shows that our observations are consistent with an interface that, when sliding, experiences full slip during half of each cycle. We discuss the implications for this technique as a sensitive probe of sliding friction.

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A Game Theory Analysis Of Firm Reaction To External Organizational Demands: The Case Of Animal Welfare Standards, Sheril Sherine Tzul Jan 2007

A Game Theory Analysis Of Firm Reaction To External Organizational Demands: The Case Of Animal Welfare Standards, Sheril Sherine Tzul

Agribusiness and Applied Economics

There has been increasing public concern about farm animal welfare regarding transportation, slaughter, and some management practices, especially in systems where animals are confined for most of their existence. Animal welfare organizations (groups) have traditionally focused on forwarding their agendas through legislation, although more recent attempts have focused on convincing large firms that buy agricultural commodities to require particular production process standards to be met. The strategic interactions of players in the egg industry are modeled using a game theory approach. Two scenarios were explored: a principal-agent contract model between food firms and farmers, and a model where two firms …

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An Econometric Analysis Of Cost Changes In U.S. Trucking And The Implications Of Implementing The Nafta Trucking Provisions, Erica Kay Peterson Jan 2007

An Econometric Analysis Of Cost Changes In U.S. Trucking And The Implications Of Implementing The Nafta Trucking Provisions, Erica Kay Peterson

Agribusiness and Applied Economics

The United States trucking industry underwent deregulation starting in 1980. There was much opposition to the process in fears that trucking companies would be adversely affected by increased competition. There were also many proponents and researchers who proved that the increased competition due to regulatory reform only helped strengthen the industry by forcing firms to become more cost efficient. There has been similar opposition and support for the trucking provisions of NAFTA. Although the provisions have not been fully implemented, the trucking industry is well aware it will only be a matter of time. In early 2002 it was announced …

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A Reference Price Model Of Sugar Consumption With Implications On Obesity, Cary Marshall Effertz Jan 2007

A Reference Price Model Of Sugar Consumption With Implications On Obesity, Cary Marshall Effertz

Agribusiness and Applied Economics

Obesity has increased dramatically in the past 25 years. The consumption of added sugar has increased significantly during the same time period. Previous research indicates a direct correlation between the consumption of added sugar and the prevalence of obesity. Sugar has been identified in multiple studies as having addictive or opiate-like qualities. Unquestionably, added sugar consumption has contributed to the current obesity epidemic. Here, we apply a reference price economic model to attempt to describe sugar consumption. Using consumption and price data from the Economic Research Service of the United States Department of Agriculture, we made a reference price estimation …

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Implied World Views In Pictures: Reflections From A Cognitive Psychological And Anthropological Point Of View, Michael Ranta Jan 2007

Implied World Views In Pictures: Reflections From A Cognitive Psychological And Anthropological Point Of View, Michael Ranta

Contemporary Aesthetics (Journal Archive)

In traditional art history, iconological attempts to analyze visual works of art by treating their formal and semantic features as symptoms of more general, implied world views or cultures have occurred rather frequently. Still, such attempts have been criticized for permitting subjective and non-verifiable interpretations. In this paper, however, I will argue that (i) pictorial works of art indeed imply wider world views or schemata, and (ii) that our comprehension of these schemata can be explained by taking into account recent research within cognitive psychology. More specifically, I will argue that intelligence partly consists of the storage and retrieval of …

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Nietzsche's Debt To Kant's Theory Of The Beautiful In 'Birth Of Tragedy', R. Kevin Hill Jan 2007

Nietzsche's Debt To Kant's Theory Of The Beautiful In 'Birth Of Tragedy', R. Kevin Hill

Philosophy Faculty Publications and Presentations

Nietzsche describes Birth of Tragedy as a contribution to “the science of aesthetics”. In this paper, I will argue that a crucial influence on his emerging views was Kant’s Critique of Judgment. Nietzsche’s early aesthetic views are often attributed to some combination of Schopenhauer’s analyses of the plastic arts (inspiring Nietzsche’s conception of the Apollinian) and his analysis of music (inspiring Nietzsche’s conception of the Dionysian) along with Nietzsche’s own original insights into how these combine to form the tragic. As we shall see, the resources of Schopenhauer’s aesthetics were unavailable to Nietzsche due to epistemological commitments he had …

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Fabrication Of Carbon Nanotube-Based Nanodevices Using A Combination Technique Of Focused Ion Beam And Plasma-Enhanced Chemical Vapor Deposition, Jianfeng Wu, Micah Eastman, Timothy Gutu, Madeline Wyse, Jun Jiao, S.-M. Kim, M. Mann, Y. Zhang, K. B. Teo Jan 2007

Fabrication Of Carbon Nanotube-Based Nanodevices Using A Combination Technique Of Focused Ion Beam And Plasma-Enhanced Chemical Vapor Deposition, Jianfeng Wu, Micah Eastman, Timothy Gutu, Madeline Wyse, Jun Jiao, S.-M. Kim, M. Mann, Y. Zhang, K. B. Teo

Physics Faculty Publications and Presentations

This study focuses on the fabrication of two nanodevice prototypes which utilized vertical and horizontal carbon nanotubes used the focused ion beam to localize the catalysts, followed by plasma-enhanced chemical vapor deposition. First, metal-gated carbon nanotube field emitter arrays were fabricated on multilayer substrates containing an imbedded catalyst layer. Second, horizontally aligned single-walled carbon nanotubes were grown on a transmission electron microscopy grid. This allows the carbon nanotubes to be directly analyzed in a transmission electron microscope. It is expected that the methodology introduced here will open up opportunities for the direct fabrication of carbon nanotube based nanodevices.

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Selective Growth Of Single-Crystalline Zno Nanowires On Doped Silicon, Rolf Könenkamp, Robert Campbell Word, M. Dosmailov, J. Meiss, Athavan Nadarajah Jan 2007

Selective Growth Of Single-Crystalline Zno Nanowires On Doped Silicon, Rolf Könenkamp, Robert Campbell Word, M. Dosmailov, J. Meiss, Athavan Nadarajah

Physics Faculty Publications and Presentations

We report the growth of single-crystalline ZnO nanowires on n- and p-type Si wafers by electrodeposition. On strongly doped n-type Si high-quality nanowires can be grown under similar conditions as used for metallic substrates. For low electron concentrations occurring in weakly n-type or in p-type wafers, nanowire growth is inhibited. This difference allows selective growth in strongly n-type areas. The inhibited growth on weakly n-type and p-type wafers can be improved by applying stronger cathodic electrode potentials or by illuminating the growth area. The wires on n-Si show efficient electroluminescence covering the visible and extending into the ultraviolet spectral range.

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Portland State Magazine, Portland State University. Office Of University Communications Jan 2007

Portland State Magazine, Portland State University. Office Of University Communications

Portland State Magazine

PSU’s alumni magazine, published 2-3 times a year. In this issue: It’s murder told in an unusual way that has this English professor fascinated; students chronicle their Education Abroad experiences through winning photographs; new chemistry faculty and facilities are advancing drug discovery and development; and more.

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Forbidding And Enforcing Of Formal Languages, Graphs, And Partially Ordered Sets, Daniela Genova Jan 2007

Forbidding And Enforcing Of Formal Languages, Graphs, And Partially Ordered Sets, Daniela Genova

USF Tampa Graduate Theses and Dissertations

Forbidding and enforcing systems (fe-systems) provide a new way of defining classes of structures based on boundary conditions. Forbidding and enforcing systems on formal languages were inspired by molecular reactions and DNA computing. Initially, they were used to define new classes of languages (fe-families) based on forbidden subwords and enforced words. This paper considers a metric on languages and proves that the metric space obtained is homeomorphic to the Cantor space. This work studies Chomsky classes of families as subspaces and shows they are neither closed nor open. The paper investigates the fe-families as subspaces and proves the necessary and …

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Johnson’S System Of Distributions And Microarray Data Analysis, Florence George Jan 2007

Johnson’S System Of Distributions And Microarray Data Analysis, Florence George

USF Tampa Graduate Theses and Dissertations

Microarray technology permit us to study the expression levels of thousands of genes simultaneously. The technique has a wide range of applications including identification of genes that change their expression in cells due to disease or drug stimuli. The dissertation is addressing statistical methods for the selection of differentially expressed genes in two experimental conditions. We propose two different methods for the selection of differentially expressed genes. The first method is a classical approach, where we consider a common distribution for the summary measure of equally expressed genes. To estimate this common distribution, the Johnson system of distribution is used. …

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Transfer Track Versus Workforce Development: Implications For Policy Change In Florida Community Colleges, Karen Griffin Jan 2007

Transfer Track Versus Workforce Development: Implications For Policy Change In Florida Community Colleges, Karen Griffin

USF Tampa Graduate Theses and Dissertations

Policy-makers intend community colleges to be the primary vehicles for workforce development education and training. In support of this intent, community college mission statements and curricular patterns should clearly indicate a workforce emphasis. Do these statements and curricular patterns reflect policy intent? If not, are resources being directed appropriately? This study was conducted to determine whether the current composition of the overall Florida public community college curriculum and the content of Florida public community college mission and planning statements provided evidence to support Florida leadership policy statements that portray workforce development as a primary component of the community college mission. …

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Transport Characteristics Using Nor- Dihydroguaiaretic Acid (Ndga)- Polymerized Collagen Fibers As A Local Drug Delivery System, Eric Guegan Jan 2007

Transport Characteristics Using Nor- Dihydroguaiaretic Acid (Ndga)- Polymerized Collagen Fibers As A Local Drug Delivery System, Eric Guegan

USF Tampa Graduate Theses and Dissertations

Dexamethasone and dexamethasone 21-phosphate were loaded into NDGA-polymerized collagen fibers and release rate studies were performed to calculate their diffusion coefficients. Dexamethasone loaded fibers were placed in a PBS solution for specified time intervals (1, 3, 6, 7, 12, 24, 30, and 48 hours) after which the eluant was removed and analyzed by capillary zone electrophoresis (CZE). CZE is a tool that can be utilized for quantitative analysis of chemical compounds. This data was incorporated into mathematical models to determine the diffusion coefficient. The diffusion coefficient (D) for dexamethasone in NDGA-polymerized collagen fibers is D = 1.86 x 10-14 …

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Comprehensive School Reform In The Wake Of No Child Left Behind: Teacher Perceptions In Dodgeland, Allyson Regina Haag Jan 2007

Comprehensive School Reform In The Wake Of No Child Left Behind: Teacher Perceptions In Dodgeland, Allyson Regina Haag

USF Tampa Graduate Theses and Dissertations

This thesis is an analysis of teacher perceptions of the implementation of their school's comprehensive school reform, and the George W. Bush administration's federal educational policy, the No Child Left Behind Act (NCLB). Data were collected by a research team as a part of the National Longitudinal Evaluation of Comprehensive School Reform (NLECSR), a project under the direction of the American Institutes for Research (AIR). The thesis is a supplemental qualitative analysis by the author who was part of the NLECSR research team from 2004 through 2005. The NLECSR had a quantitative component (called the Core Study) consisting of a …

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Development Of A Method To Determine Vapor Pressure Data Of Low Volatile Chemicals From A Knudsen Effusion Technique, Andrew R. Harshman Jan 2007

Development Of A Method To Determine Vapor Pressure Data Of Low Volatile Chemicals From A Knudsen Effusion Technique, Andrew R. Harshman

USF Tampa Graduate Theses and Dissertations

Vapor pressure data are vital to understanding impacts that substances, specifically pesticides, may exert on the environment. They enter into atmospheric deposition models for such chemicals which determine the fate and transport of these species in the environment. At normal application temperatures (i.e. room temperature) the vapor pressures of many of these chemicals are too low to be determined by conventional means. An isothermal Knudsen effusion technique was designed and developed in our laboratory for such measurements. The effusion mass as a function of time is measured in our technique using a thickness shear mode (TSM) acoustic wave sensor, which …

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A Gis-Based Inventory Of Terrestrial Caves In West-Central Florida: Implications On Sensitivity, Disturbance, Ownership, And Management Priority A Gis-Based Inventory Of Terrestrial Caves In West-Central Florida: Implications On Sensitivity, Disturbance, Ownership, And Management Priority, Grant L. Harley Jan 2007

A Gis-Based Inventory Of Terrestrial Caves In West-Central Florida: Implications On Sensitivity, Disturbance, Ownership, And Management Priority A Gis-Based Inventory Of Terrestrial Caves In West-Central Florida: Implications On Sensitivity, Disturbance, Ownership, And Management Priority, Grant L. Harley

USF Tampa Graduate Theses and Dissertations

Active cave management, which represents any continuous action to conserve, restore, or protect a cave environment, is virtually non-existent in west-central Florida. This study focuses on developing an inventory to rank terrestrial caves in west-central Florida by management priority. A GIS-based cave inventory system, including a cave sensitivity index and cave disturbance index, were used as a tool to gain an understanding of the management priority of west-central Florida caves. The inventory was applied to 36 terrestrial caves in west-central Florida, which demonstrated a wide range of sensitivity and disturbance. The results show that by relying solely on sensitivity and …

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Implementing Differentiated Instruction In Urban, Title I Schools: Effects Of Facilitated Support Groups And Program Fidelity On Student Achievement, Deborah W. Hellman Jan 2007

Implementing Differentiated Instruction In Urban, Title I Schools: Effects Of Facilitated Support Groups And Program Fidelity On Student Achievement, Deborah W. Hellman

USF Tampa Graduate Theses and Dissertations

This study presents the results of a mixed methodology study and pilot that investigated the effects of facilitated teacher support groups and differentiated instruction on student achievement at two urban, Title I middle schools. Both general education and students with special needs being served in a collaborative co-taught setting were included in the study. Implications for research to practice and effective inclusive strategies were addressed and the field-tested Differentiated Instruction: Fidelity Implementation Tool (DI: FIT) used to assess teacher fidelity is included. During the first year, the principal investigator developed and field-tested the DI: FIT observation tool, field-tested a facilitated …

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Modeling Larval Connectivity Among Coral Habitats, Acropora Palmata Populations, And Marine Protected Areas In The Florida Keys National Marine Sanctuary, Christopher John Higham Jan 2007

Modeling Larval Connectivity Among Coral Habitats, Acropora Palmata Populations, And Marine Protected Areas In The Florida Keys National Marine Sanctuary, Christopher John Higham

USF Tampa Graduate Theses and Dissertations

The Florida Keys National Marine Sanctuary (FKNMS) encompasses North America's only living coral barrier reef and the third longest barrier reef in the world, making it a unique national treasure of international notoriety (FKNMS, 2005). Recent evidence of environmental decline within the sanctuary has created a sense of urgency to understand and protect the valuable resources within. This thesis contributed to the understanding of habitat connectivity to aid managers and decision makers in the creation of additional Marine Protected Areas (MPAs) in the FKNMS to help prevent further environmental decline. This research specifically focused on modeling larval transport and larval …

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Numerical Modeling And Simulation For Analysis Of Convective Heat And Mass Transfer In Cryogenic Liquid Storage And Hvac&R Applications, Son Hong Ho Jan 2007

Numerical Modeling And Simulation For Analysis Of Convective Heat And Mass Transfer In Cryogenic Liquid Storage And Hvac&R Applications, Son Hong Ho

USF Tampa Graduate Theses and Dissertations

This work presents the use of numerical modeling and simulation for the analysis of transport phenomena in engineering systems including zero boil-off (ZBO) cryogenic storage tanks for liquid hydrogen, refrigerated warehouses, and human-occupied air-conditioned spaces. Seven problems of medium large spaces in these fields are presented. Numerical models were developed and used for the simulation of fluid flow and heat and mass transfer for these problems. Governing equations representing the conservation of mass, momentum, and energy were solved numerically resulting in the solution of velocity, pressure, temperature, and species concentration(s). Numerical solutions were presented as 2-D and 3-D plots that …

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High-Stakes Testing In Florida: Media Portrayals And Parental Realities, Jennifer Gilroy Hunsecker Jan 2007

High-Stakes Testing In Florida: Media Portrayals And Parental Realities, Jennifer Gilroy Hunsecker

USF Tampa Graduate Theses and Dissertations

In 1998, Florida implemented a system of standardized testing known as the Florida Comprehensive Assessment Test (FCAT). While initially designed as one among many tools to assess student and school progress, the FCAT has become a high-stakes test. Schools whose students fail to meet certain benchmarks are in danger of losing their students to "school choice plans" (which enable parents of children attending failing schools to choose another, more highly rated school) while parents must contend with ever broadening educational policies. The implications of this policy have been far reaching. Textbook makers now market individualized textbooks that teach FCAT content, …

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Numerical Simulation Of Steady State And Transient Heat Transfer In Microchannels, Phaninder Injeti Jan 2007

Numerical Simulation Of Steady State And Transient Heat Transfer In Microchannels, Phaninder Injeti

USF Tampa Graduate Theses and Dissertations

In this project we studied the effect of different parameters on heat transfer in two-dimensional microchannels, microtubes and also tube-in-block heat exchangers for various engineering applications. These included the use of flow restrictions to enhance local heat or mass transfer rate, enhancement of conjugate heat transfer with discrete heating and magnetic coolers (or heaters) associated with magnetic refrigeration system. The results of this research will help in designing the heating or cooling systems and selection of their appropriate geometrical dimensions and materials for specific applications. Types of problems studied in this project are: steady state analysis of forced convection around …

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The Development Of Leadership Skills Through Diversity Of Student Organizational Leadership, Daniel M. Jenkins Jan 2007

The Development Of Leadership Skills Through Diversity Of Student Organizational Leadership, Daniel M. Jenkins

USF Tampa Graduate Theses and Dissertations

The steady increase of racial and ethnic diversity in public universities has provided student leaders with many challenges. However, little is known about the effects of racial and ethnic diversity on the development of these student leaders. This study aims to evaluate the effects of racial and ethnic diversity in college student organizations on the development of student leaders and the perceived value of such diversity on their development. The sample consists of 833 student leaders from Florida's ten public universities who completed online surveys. The questions asked were designed to evaluate their past and present leadership roles and skills, …

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The Relationship Between Technology Integration And Achievement Using Multi-Level Modeling, Tina N. Hohlfeld Jan 2007

The Relationship Between Technology Integration And Achievement Using Multi-Level Modeling, Tina N. Hohlfeld

USF Tampa Graduate Theses and Dissertations

The purpose of this longitudinal study was to examine the relationship between technology integration indicators and school level achievement. Four years of school level secondary data from publicly available databases maintained by the Florida Department of Education were combined for all public elementary, middle, and high schools in the state. This study examined approximately 2300 schools that participated each year in the Florida Innovates Survey about technology integration between 2003-04 and 2006-07. Complexity theory supported the use of multi-level modeling to examine the relationships between technology integration and outcomes. Three achievement outcomes (reading, mathematics, and writing) and two mediating behavioral …

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The Principal’S Role In Building Teacher Leadership Capacity In High-Performing Elementary Schools: A Qualitative Case Study, Rahim Jamal Jones Jan 2007

The Principal’S Role In Building Teacher Leadership Capacity In High-Performing Elementary Schools: A Qualitative Case Study, Rahim Jamal Jones

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to explore how public elementary school principals develop teacher leadership capacity within their schools, as well as the effect of this effort on a school's performance. After examining a variety of sources, such as journal articles and web-based search engines, the researcher determined that there was scant information explaining the process principals undergo to create teacher leadership roles in an effort to develop a high-performing school. To accomplish the goals of this study, salient reports in the field of teacher leadership were reviewed. The insights afforded from these reports guided the researcher in developing …

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Computer-Mediated Peer Response In A Level-Iv Esl Academic Writing Class: A Cultural Historical Activity Theoretical Perspective, Li Jin Jan 2007

Computer-Mediated Peer Response In A Level-Iv Esl Academic Writing Class: A Cultural Historical Activity Theoretical Perspective, Li Jin

USF Tampa Graduate Theses and Dissertations

Very few studies focus on how English as a second language (ESL) students' agency and their unique histories as an integral part of the social cultural environment influence his or her participation in computer-mediated peer response tasks, particularly in a multimedia-based synchronous communication environment. Considering each ESL student as an active agency with unique historical bearings, the dissertation investigated ESL students' participation in computer-mediated peer response (CMPR) tasks that used instant messenger (IM) as the communication technology between students from the cultural historical activity theoretical (CHAT) perspective, which views all human interaction as a dynamic developmental process. A case study …

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Technology In Low Socio-Economic K-12 Schools: Examining Student Access And Implementation, Katherine J. Kemker Jan 2007

Technology In Low Socio-Economic K-12 Schools: Examining Student Access And Implementation, Katherine J. Kemker

USF Tampa Graduate Theses and Dissertations

Over the past twenty years, there has been an enormous financial investment in technology for K-12 schools to help bridge the digital divide between high and low socioeconomic (SES) students. These investments have included hardware, software, professional development, and research studies on the effectiveness of technology in the classroom. This dissertation explored the essential conditions for the integration of technology, access, student-centered learning environment, and teacher use in the curriculum. Florida's elementary schools were divided into quartiles based on free and reduced lunch to investigate differences between the top quartile of high SES schools (n=400) and the lower quartile of …

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Rkem Implementation For Strain Gradient Theory In Multiple Dimensions, Abhishek Kumar Jan 2007

Rkem Implementation For Strain Gradient Theory In Multiple Dimensions, Abhishek Kumar

USF Tampa Graduate Theses and Dissertations

The Reproducing Kernel Element Method (RKEM) implementation of the Fleck-Hutchinson phenomenological strain gradient theory in 1D, 2D and 3D is implemented in this research. Fleck-Hutchinson theory fits within the framework of Touplin- Mindlin theories and deals with first order strain gradients and associated work conjugate higher-order stress. Theories at the intrinsic or material length scales find applications in size dependent phenomena. In elasticity, length scale enters the constitutive equation through the elastic strain energy function which depends on both strain as well as the gradient of rotation and stress. The displacement formulation of the Touplin Mindlin theory involve diffrential equations …

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