Digital Commons Network^™

Optimal Allocation Of Blood Products, Godson A. Tetteh

Dissertations

The high cost of collection and the short shelf life of apheresis platelets demand efficient inventory management to reduce outdates and shortages. Apheresis platelets are licensed for seven days, and blood centers are keen on knowing the consequences of various product collection and distribution strategies. To reduce outdates, inventory managers typically distribute the older units first, thereby following first-in first-out (FIFO) policy; however, hospital blood banks would prefer that the blood center issues out the freshest units first, equivalent to a last-in first-out (LIFO) policy. This study addresses the optimal distribution policy to achieve a desired outdate, shortage and average …

Micro, Meso And Macro Materials Processing Using High-Speed Liquid Projectiles, Veljko Samardzic

Dissertations

The objective of this research is developmentof aknowledge base of materials processing by the impact of high-speed liquid projectiles. The work involved experimental study of generation and applications of high-speed liquid projectiles. The projectiles were generated by the launchers, which used gunpowder as an energy source. The experiments were carried out at the low (O.35g of the powder), middle (1.2g) and high (10g to 70g) levels of energy consumptions and at several different launchers modification.

Experimental investigation of effect of gun powder mass on energy of projectile was conducted for ductile and brittle targets. An array of experimental …

Dynamics Of Online Chat, Mihai Moldovan

Dissertations

Millions of people use online synchronous chat networks on a daily basis for work, play and education. Despite their widespread use, little is known about their user dynamics. For example, one does not know how many users are typically co-present and actively engaged in public interaction in the individual chat rooms of any of the numerous public Internet Relay Chat (IRC) networks found on the Internet; or what are the factors that constrain the boundaries of user activity inside those chat rooms. Failure to collect and present such data means there is a lack of a good understanding of the …

Perception Gaps And The Adoption Of Information Technology In The Clinical Healthcare Environment, Karen Hare

Dissertations

Implementation of information systems has lagged in many areas of clinical healthcare for a variety of reasons. Economics, data complexity and resistance are among the often quoted roadblocks. Research suggests that physicians play a major part in the adoption, use and diffusion of information technology (IT) in clinical settings. There are also other healthcare professionals, clinical and non-clinical, who play important roles in making decisions about the acquisition of information technology. In addition to these groups there are information technology professionals providing the services required within the healthcare field. Finally within this group are those IT professionals who have sufficient …

Modeling Inventory And Responsiveness Costs In A Supply Chain, Robert Nearier

Dissertations

Evaluation of supply chain performance is often complicated by the various interrelationships that exist within the network of suppliers. Currently many supply chain metrics cannot be analytically determined. Instead, metrics are derived from monitoring historical data, which is commonly referred to as Supply Chain Analytics. With these analytics it is possible to answer questions such as: What is the inventory cost distribution across the chain? What is the actual inventory turnover ratio? What is the cost of demand changes to individual suppliers? However, this approach requires a significant amount of historical data which must be continuously extracted from the associated …

The Impact Of Cultural Differences In Temporal Perception On Global Software Development Teams, Richard William Egan

Dissertations

This dissertation investigated the impact of cultural differences in temporal perception on globally dispersed software development teams. Literature and anecdotal evidence suggest that these temporal differences affect individual communication quality, which in turn will affect individual satisfaction and trust within global teams. Additionally, the temporal dispersion of the team was expected to affect an individual's sense of temporal disruption which, in turn, was expected to affect individual satisfaction and trust. Differences in temporal perception were expected to moderate this impact on perceived temporal disruption. A Fortune 100 Company that carried out software testing in Ireland, the United States, China and …

The 2002 No Child Left Behind Act (Nclb), The Amended 2004 Individuals With Disabilities Educational Act (Idea), And Promoting The American Democratic Ideals Of Equity And Access, Bambi Rene' Bethel-Leitschuh

Dissertations

Abstract There is a long history relative to the purpose of American public education. Since at least the Founders, in particular Thomas Jefferson, the purpose of public education has been to prepare children to assume the primary political office, that of citizen. The reasoning was that for a democracy to endure citizens would have to make political judgments relative to both preserving the democracy and furthering democratic ideals including equity and access to the ?good life.? This educational philosophy took root more firmly during the 19th century with the advancement of the Common School. The twentieth century saw the dramatic …

The Relationship Between Learning Styles And Student Performance On The Palmetto Achievement Challenge Test In A Low Performing, Low Socioeconomic-Status School, Joseph Lassale Williams

Dissertations

The intention of this research was to bring light to the current state mandated testing, and possible solutions in assisting educators to address the issues of students not meeting the standards. In more general terms, this study is looking to prove to what extent a student's learning style has on their performance on the Palmetto Achievement Challenge Test (PACT). This study analyzed four of the twenty-six learning preference areas identified by the Learning Style Instrument (LSI) of middle school students in a traditional public middle school in seventh grade. The four areas that were looked at were kinesthetic, tactile, auditory, …

Teachers' Participation In Formal Induction Programs And Their Subsequent Level Of Professional Growth In Wisconsin Public Schools, Paul Edmund Blanford Sr.

Dissertations

This study investigated the relationship between teachers' participation in formal induction programs and their subsequent level of professional growth as measured by two variables (graduate level credits/graduate degrees attained) as reported by public school teachers in the State of Wisconsin. In addition, selected demographic variables (teachers' age; teachers grade level taught; teachers' school district size; training and support provided to teachers in their first years of teaching; participation by teachers in mentoring and induction programs; teachers' level of education) were examined for their predictive relationships with teacher induction and professional development.

This study was conducted during the spring of 2007. …

The Effect Of The Middle School Concept On Student Achievement In Coastal Mississippi Middle Level Schools, Mary Lee Davis

Dissertations

In this study, the researcher examined the effect of the implementation of the middle school concept on student achievement in coastal Mississippi middle level schools with a grade configuration of 6-8. The study was conducted in the fall semester of the 2006-2007 school year; archival data were collected from the Mississippi Department of Education's Web site. There were 15 schools identified as housing grades 6-8; of those 15, participants included 12 coastal Mississippi middle level schools. There was a total of 9 schools identified as implementing the middle school concept, and 6 schools were identified as not implementing the concept; …

Differences In Learning Motivations Of Professionals And Nonprofessionals Participating In Two South Mississippi Institutes For Learning In Retirement, Constance Marie Farmer

Dissertations

This study investigated the differences in learning motivations of (a) professional and nonprofessional, and (b) urban and rural members of two south Mississippi Institutes for Learning in Retirement (ILR) programs in an attempt to expand C. O. Houle's conceptual model of continuing professional education into the retirement years and to determine if the life transitions of the older adult unite the learning orientations of these subpopulations into self-actualizing (growth) motives as part of the maturation process identified y Abraham Maslow.

Ninety urban ILR and 60 rural ILR members were recruited. Professional was defined as having completed a bachelor's degree or …

Student Achievement And Teacher Perception In Small Schools And Large Schools, Frances Irene Dearman

Dissertations

The study analyzed student achievement in various school sizes and teachers' perceptions of relationships and interactions with colleagues, students, and parents depending on the size of the school in which teachers work. The purpose was to assist school leaders when they are faced with decisions about school size.

Simple linear regression was used to analyze the relationship of achievement and school size of fourth-grade students. The variables mathematics achievement and size and language arts achievement and size were positively correlated. These findings suggest that as the size of a school increases, achievement increases. After holding the variables socioeconomic status and …

The Effects Of Positive Behavior Intervention Support On Office Discipline Referrals, Third And Fourth Grade Reading And Math Scores, And Perceptions Of Teachers Regarding Discipline And Safety In Alabama Elementary Schools, Denise Yvonne Pavlovich

Dissertations

This study examined the relationship between Positive Behavior Intervention Strategies and school-wide discipline problems after a school had been trained in Positive Behavior Intervention Support, the difference in educators' perceptions about the relationship between positive school climate, SAT scores, and academic achievement. The researcher surveyed 35 schools in Alabama and collected office discipline referral data, SAT scores, and teacher/administrator perception data. Some of the data were gathered via the Internet for the years prior to implementation, during implementation, and the year following implementation. A survey was sent to each of the schools to collect perception data. Results indicated a significant …

An Analysis Of The Career Maturity Levels Of Intellectually Gifted Adolescents, Yolanda Yvette Baker Cobb

Dissertations

This research project was conducted to analyze the career maturity level scores of intellectually gifted middle school students. The Career Maturity Inventory-Revised (Crites & Savickas, 1995) was used to compare the career-choice readiness of the intellectually gifted students to their typical middle school-age peers, as well as to the 9th through 12th graders in the norm sample. In addition, a comparison of the career maturity levels of intellectually gifted male and female 6th and 7th graders was also conducted. It was also hypothesized that the intellectually gifted students' career maturity score would increase as the students' grade level increased T-tests …

Photopolymerization And Characterization Of Crosslinked Thiol-Ene Networks And Poss/Thiol-Ene Nanocomposites, Tolecia Sharonda Shaunee Clark

Dissertations

Interests in the area of thiol-ene photopolymerization are rapidly expanding due to the numerous advantages over the polymers produced by traditional solvent based polymerizations. Although current research of photoinitiated thiol-ene polymerization is diverse, numerous opportunities are available for investigating structure/property and structure/reactivity relationships and novel material applications. This research in this dissertation includes a fundamental study of the effect of monomelic thiol functionality on thiol-ene polymerization kinetics and formation of the thiol-ene network structure, and an investigation of the development of novel silicate based thiol-ene nanocomposites. The first fundamental study investigates the effect of thiol functionality on the kinetics and …

Effects Of Nonfiction Guided Interactive Read-Alouds And Think-Alouds On Fourth Grader's Depth Of Content Area Science Vocabulary Knowledge And Comprehension, Tania Tamara Henderson Hanna

Dissertations

Effects of nonfiction guided interactive read-alouds and think-alouds as a supplement to basal science textbooks on three vocabulary measures, definitions, examples, and characteristics, and one multiple-choice comprehension measure were assessed for 127 fourth graders over three time periods: pretest, posttest, and a 2-week delayed posttest. Two of three fourth grade elementary science teachers implemented a series of 12 content enhanced guided interactive scripted lessons. Two of these teachers implemented two treatments each. The first condition employed basal science textbooks as the text for guided interactive read-alouds and think-alouds while the second treatment employed basal science textbooks in conjunction with nonfiction …

The Design, Synthesis, And Controlled Polymerization Of Cationic And Zwitterionic Norbornene Derivatives, David Allen Rankin

Dissertations

Ring-opening metathesis polymerization (ROMP) has been exploited for the controlled polymerization of cationic and zwitterionic norbornene-based monomers and employed in the preparation of homo- and block-copolymer systems in homogeneous organic media without the use of post-polymerization modification or protecting group chemistries. Relying on previous knowledge of certain halogenated alcoholic organic solvents capable of solubilizing hydrophilic monomers, the first study, describes the synthesis and controlled polymerization of a series of new permanently cationic ammonium exo-7- oxanorbornene derivatives M31 via ROMP, with the first generation Grubbs catalyst 17, in a novel solvent mixture comprised of 1:1 vol/vol 2,2,2-trifluoroethanol (TFE)/methylene chloride (CH2CI2). This …

Synthesis And Characterization Of Polymeric Materials Derived From Multifunctional Alkyl A-Hydroxymethylacrylates, Jean-Francois Morizur

Dissertations

The research presented in this dissertation covers the investigation of new materials derived from alkyl a-hydroxymethylacrylates (RHMA). The first project exposed in Chapter II involves the synthesis, characterization of RHMA-based reactive surfactants and their successful incorporation in acrylic latexes. The amphiphilic monomers testify of a good copolymerization behavior with other acrylic monomers such as methyl methacrylate and butyl acrylate although their extensive bulkiness. They led to the formation of well-defined polymeric particles via a seeded emulsion polymerization process and permitted decreasing significantly the water sensitivity of the resulting films as compared to film incorporating conventional emulsifier such as sodium dodecyl …

Raft Synthesis Of Water-Soluble, Stimuli-Responsive Ab Diblock Copolymers, Ran Wang

Dissertations

A series of water-soluble, stimuli-responsive AB diblock copolymers were synthesized via the reversible addition-fragmentation chain transfer (RAFT) polymerization technique employing 2-(2- carboxyethylsulfanylthiocarbonylsulfanyl)propionic acid (CTA26) as the RAFT mediating agent.

First, a series of diacid functional trithiocarbonate chain transfer agents (CTA's) were synthesized and examined for their effectiveness as mediating agents in controlling the polymerization of «-butyl acrylate (nBA). Overall, CTA26 demonstrated good control in the homopolymerization of nBA with respect to the molecular weight and the molecular weight distribution, as well as its ability to form block copolymers with high reinitiating efficiency, and thus was chosen as the CTA for …

Private And Public University Students' Perceptions Of Cultural Adjustment Problems In Study Abroad Programs, Walter R. Heinecke Edd

Dissertations

In a world that is increasingly integrated by economics, communications, and politics, higher education is asked to deliver graduates who can function professionally in the international arena. One way to do this is through study abroad programs, which have skyrocketed in popularity among American students over the last 15 years, increasing by 83% to more than 205,000 students in 2007. Despite the obvious benefits associated with such programs, there are challenges to living abroad as well—especially for young adults. To get some sense of these challenges, during the 2005-2006 academic year 114 study abroad students from 2 Southern California universities …

Teachers' Beliefs About The Factors That Support Successful Second Language Acquisition Of Elementary School Students, Joann M. Mcdonald Edd

Dissertations

Second language acquisition has increased in importance in elementary schools throughout the United States due, in part, to the growing numbers of English Language Learners (ELLs) as well as an economic and social demand for native English speakers to learn world languages. The purpose of this study was to investigate elementary teachers' beliefs regarding the factors that contribute to successfully learning a second language, whether students are ELLs learning English as a new language or English speakers learning a new language. More specifically, this study compared the opinions of elementary teachers of successful ELLs with teachers of English speakers successfully …

School Web Sites Within The Educational Marketplace: A Case Study Investigating The Parents As Engaged Consumer-Users, Claudia Jane Beeman Edd

Dissertations

Schools -- like their corporate counterparts -- recognize the many advantages that the Internet affords. Today's schools vie for students, and thus use the web to market their services and showcase their management team (administrators, teachers, staff) and academic accomplishments. In a sense, then, web sites are the public face of education; those that are well-designed and multi-featured can enhance a district's public image and create the perception of excellence and competence. This case study explores how one suburban, K-8 school district approaches web site development, specifically, the process by which decisions about design, development, and maintenance are made (and …

Broadband Dielectric Spectroscopy Studies Of Nafion, David Walter Rhoades

Dissertations

In light of available literature regarding Nafion® materials, it is apparent that an information gap exists between the current state of understanding of Nafion relaxations and the dielectric behavior of these materials. Although the currently available dielectric relaxation data is accurate it is very limited in its scope—specifically in-depth broadband analyses are not available. As a result, very little information is available regarding the dependence of the relaxation processes on frequency and temperature. This presents an important opportunity for the exploration of the dielectric broadband relaxation behavior of Nafion® materials. The primary intent of this research is to quantify the …

The Impact Of Systematic Professional Development On Selected Areas Of Student Performance In Selected Missouri School Buildings, Clifford J. Carver

Dissertations

With the constraints under the No Child Left Behind Act, schools face the challenges of meeting extremely high standards with students. Recent research generally focuses on the role of professional development in school reform. Although a great deal has been written on the topic of professional development, the empirical literature on the topic is much less extensive. Few studies have actually documented its impact on student achievement. The purpose of this study was to determine the impact of systematic professional development on selected areas of student performance in selected Missouri school buildings. This research study was quantitative in nature and …

A Proof Of Concept For Oppnets And Its Resource Utilization Techniques With Qos Constraints, Zill-E-Huma Kamal

Dissertations

The increased number of embedded devices/systems in our environment and the evolution of the internet as a service oriented network connote two things: the demand for ubiquitous computing, and, the abstraction of users as consumers and applications as services, as in Service Oriented Computing (SOC) and Web Service domains.

This Thesis studies Class 2 Opportunistic Networks, Oppnets--in short. Oppnets propagate dynamic interconnection of heterogeneous devices/networks/systems and the integration of their resources or services-such as computation, communication, sensing, actuation, and storage -irrespective of the discrepancies in hardware, software, protocols, or standards employed, to enable ubiquitous computing. The novelty of Oppnets …

The Role Of Prediction In The Teaching And Learning Of Algebra, Lisa Kasmer

Dissertations

Research has shown that including prediction questions within reading and science instruction has been advantageous for students, yet minimal research existed regarding the use of such questions within mathematics instruction. In order to extend and build on our knowledge about the effects of prediction in mathematics instruction, this study explored the impact of this paradigm in the teaching and learning of algebra. Specifically, this study probed whether utilizing prediction questions provided students opportunities for engaging in mathematical thinking, retrieving prior knowledge, and discussing related mathematical ideas, could increase such students' conceptual understanding and mathematical reasoning in the content area of …

Interactive Visual Exploration Of Large Relation, Mustafa Sanver

Dissertations

As data become ubiquitous and immense in many activities from business decision making to scientific analysis, effective analysis of such data becomes an important research area. Data analysis requires active involvement of human beings and visualization is a powerful tool to capture profound insights from data. However, interactive visual exploration of massive data poses fundamental technical challenges to both data visualization and database management systems. Millions of billions of data records clutter the screen and existing database management systems are inadequate for overview-and-drill-down data access for interactive data exploration.

We have proposed a density-based methodology to address the above challenge. …

Missing Data Treatment Of A Level-2 Variable In A 3-Level Hierarchical Linear Model, Xiaofan Cai

Dissertations

Data used in educational research often come with a hierarchical structure such as students nested in classrooms and classrooms nested in schools. Hierarchical linear model (HLM) analysis allows applied researchers to incorporate the hierarchical structure of the data into data analysis to examine effects of variables at each level. However, problems such as missing data pose analytical challenges of biased estimation. With missing data occurring in level-2 variables in a 3-level HLM analysis, the choice of the missing data treatment may affect parameter estimation at all levels.

This Monte Carlo simulation study was designed to compare performance of six missing …

A Study Of The Effectiveness Of A School District's Mentoring / Professional Development Plan For Beginning Teachers, Henry William St. Pierre

Dissertations

The purpose of the study of the mentoring/ professional development program within the teaching profession was to determine the extent and perceived value of the existing formal mentoring program in the Fort Zumwalt School District. The study found that the district's mentoring and professional development program for new teachers is effective as perceived by both beginning teachers and their administrators. The instrument used in this study was a survey designed by the District and distributed to beginning teachers who finished their first year of teaching and the formal mentor program during the 2002-2003 through the 2006-2007 school years. Surveys were …

Prospective Faculty Developing Understanding Of Teaching And Learning Processes In Science, Jose I. Pareja

Dissertations

Historically, teaching has been considered a burden by many academics at institutions of higher education, particularly research scientists. Furthermore, university faculty and prospective faculty often have limited exposure to issues associated with effective teaching and learning. As a result, a series of ineffective teaching and learning strategies are pervasive in university classrooms. This exploratory case study focuses on four biology graduate teaching fellows (BGF) who participated in a National Science Foundation (NSF) GK-12 Program. Such programs were introduced by NSF to enhance the preparation of prospective faculty for their future professional responsibilities. In this particular program, BGF were paired with …