Digital Commons Network^™

Active Caching For Recommender Systems, Muhammad Umar Qasim

Dissertations

Web users are often overwhelmed by the amount of information available while carrying out browsing and searching tasks. Recommender systems substantially reduce the information overload by suggesting a list of similar documents that users might find interesting. However, generating these ranked lists requires an enormous amount of resources that often results in access latency. Caching frequently accessed data has been a useful technique for reducing stress on limited resources and improving response time. Traditional passive caching techniques, where the focus is on answering queries based on temporal locality or popularity, achieve a very limited performance gain. In this dissertation, we …

Application Of Raman Spectroscopy In Pharmaceuticals, Anna Zarow

Dissertations

Experimental research on the use of Raman spectroscopy as an in- and on-line sensing tool and a complementary characterization technique for pharmaceutical applications is presented in this thesis. In the first chapter following a broad overview, the use of Raman spectroscopy, together with x-ray powder diffraction, scanning electron microscopy (SEM) and differential scanning calorimetry, for multilevel characterization of cryomilled powders, and the melt-grown amorphous phase of griseofulvin, a model active pharmaceutical ingredient (API), is presented and discussed in detail. A key feature was the observation of a broad inelastic background superimposed on the Raman spectra of cryomilled powders, which is …

Modeling Of Non-Uniform Hydrodynamics And Catalytic Reaction In A Solids-Laden Riser, Rajeshkumar Patel

Dissertations

The riser reactors are widely used in a variety of industrial applications such as polymerization, coal combustion and petroleum refinery because of the strong mixing of gas and solids that yields high heat and mass transfer rates, and reaction rates. In a Fluid Catalytic Cracking (FCC) process, the performance of riser reactor is strongly dependent on the interaction between the fluid and catalysts, since the reaction takes place on the active surface of the catalysts. This is why, the local coupling between hydrodynamics and reaction kinetics is critical to the development of riser reaction models. The local gas-solids flow structure …

Numerical And Asymptotic Modeling Of Evolving Nonlinear Ocean Surface Wave Fields, Matt Malej

Dissertations

The main focus of this dissertation is the asymptotic and numerical modeling of nonlinear ocean surface wave fields. In particular, a development of an accurate numerical model for the evolution of nonlinear ocean waves, including extreme waves known as Rogue/Freak waves. Due to their elusive and destructive nature, the media often portrays Rogue waves as unimaginatively huge and unpredictable monsters of the sea. To address these concerns, derivations of asymptotically reduced models, based on the small wave steepness assumption, are presented and their corresponding numerical simulations via a Fourier pseudo-spectral method are discussed. The simulations are initialized with a well-known …

Study Of The Heating And Ignition Of Metal Powder By Electrostatic Discharge, Ervin Beloni

Dissertations

The objective of this work was to understand the processes that lead to ESD stimulated ignition events in metal powders. Several metals were studied: Mg, Al, and Ti. A commercially available ESD test device was adapted for the present experiments. The ESD current and voltage were measured using inductance coils; the data were used to determine the electric circuit impedance, and energy transferred to the powder. A mode of the powder ignition (individual particles vs. dust cloud), ignition delays, burn times, and velocities of ignited and ejected particles were determined from optical measurements.

It was determined that the ESD energy …

Some Contributions To Modeling Usage Sensitive Warranty Servicing Strategies And Their Analyses, Rudrani Banerjee

Dissertations

Providing a warranty as a part of a product's sale is a common practice in industry. Parameters of such warranties (e.g., its duration limits, intensity of use) must be carefully specified to ensure their financial viability. A great deal of effort has been accordingly devoted in attempts to reduce the costs of warranties via appropriately designed strategies to service them. many such strategies, that aim to reduce the total expected costs of the warrantor or / and are appealing in other ways such as being more pragmatic to implement - have been suggested in the literature. Design, analysis and optimization …

Using Feed-Forward Networks To Infer The Activity Of Feedback Neuronal Networks, Xinxian Huang

Dissertations

The nervous system is one of the most important organ systems in a multicellular body. Animals, including human beings perceive, learn, think and deliver motion instructions through their nervous system. The basic structural units of the nervous system are individual neurons which constitute different neuronal networks with distinct functions. In each network, constituent neurons are coupled with different connection patterns, for example, some neurons send feed-forward information to the coupling neurons while others are mutually coupled. Because it is often difficult to analyze large interconnected feedback neuronal networks, it is important to derive techniques to reduce the complexity of the …

Experiences Of International Students Using Information Communication Technology In College In The United States, Olena Zhadko

Dissertations

This study surveyed 262 international students at two four-year institutions of higher education regarding their experiences with technology while in college in the United States. The study evaluated frequency of trends of Information Communication Technology usage by means of descriptive statistics. A sequential mixed methods design (Creswell, 2003) was utilized. Multiple regression analysis was used to determine which demographics of international students predict their comfort level with technology. The study further explores the experiences of international students using technology by means of face-to-face interviews to investigate those results in more depth. The researcher used a basic or generic qualitative study …

Transcriptional Regulation Of Nitrogenase And Identification Of A Fructose Transport System In Anabaena Variabilis, Justin Lynn Ungerer

Dissertations

Little is known about the regulation of nitrogenase genes in cyanobacteria. Transcription of the nifH1 and vnfH genes, encoding dinitrogenase reductases for the heterocyst-specific Mo-nitrogenase and the alternative V-nitrogenase, respectively, was studied using a lacZ reporter. Two promoters were found to be responsible for expression of nifHDK; a weak promoter within nifU1 and a strong promoter upstream of nifB (the nifB1 promoter). The region immediately upstream of vnfH did not drive expression of lacZ, however the region that included the promoter for the upstream gene, ava4055 did. Characterization of the previously reported nifH1 and vnfH transcriptional start sites by 5' …

Cord Blood Collection In Pregnant Women For Stem Cell Research, Irene Carr Phd

Dissertations

Umbilical cord blood (UCB) stem cells form commonly banked types of human tissue. Confusion remains about sources of stem cells and their use. Birth is a once in a lifetime opportunity with 74 million births per year in the world and four million occur in the United States. Cord blood contains hematopoietic stem cells and pluripotent mesenchymal cells (Moise, 2005). There is a surge of interest in the clinical use and research investigation of umbilical cord blood for transplantation and regenerative medicine. Clinicians need increased awareness and education of options for private versus public donation and banking of cord blood …

Organizational Learning And Employee Retention: A Focused Study Examining The Role Of Relationships Between Supervisors And Subordinates, Veeranuch Vatcharasirisook

Dissertations

Focusing on the relationship between supervisors and subordinates, the purpose of this research was to study the causal relationship among seven exogenous variables (Supervisor empathy with subordinates, Supervisor trust of subordinates, Planning and delivery of instruction, Accommodating subordinate uniqueness, Supervisor insensitivity toward subordinates, Subordinate-centered learning process, and Supervisor-centered learning process) and two endogenous variables (Employee’s job satisfaction, and Employee’s intention to remain in the company). The study was based on the belief that the seven factors, which were beliefs, feelings, and behaviors of supervisors in helping adults learn, based on andragogical principles of learning, are not only methods to help …

Political Institutions And Regional Inequality In China: 1949 To 2005, Qiang Yan

Dissertations

Patterns of economic inequality across three Chinese regions-- the West, the Inland, and the Coastal area-- changed twice from 1949 to 2005. During the period 1949 to 1979 regional inequality decreased, and after 1979 inequality increased. Previous studies, including economic models, cultural studies, and international relations theory, cannot fully explain changes in Chinese regional inequality after 1949. This dissertation uses Institutional Theory (IT) to analyze the changing patterns of Chinese regional economic inequality after 1949. Analyzing economic data and political documents with IT, the dissertation shows that changes in Chinese political institutions, including political parties, policy-making agencies, and institutionalized ideologies, …

Phylogenetics And Diversification Of Escallonia (Escalloniaceae), Felipe Zapata

Dissertations

Despite a large accumulation of evidence on the high richness of plant species in the mountains of South America, little is known about the historical underpinnings of this diversity. To contribute to our understanding of the origin and diversification of plant species in these mountains, I analyzed geographic patterns of variation in molecular and phenotypic characters for the genus Escallonia L.f. (Escalloniaceae), a group of shrubs widespread in montane habitats in South America. Molecular phylogenetic analyses using chloroplast and nuclear loci revealed i) that Escallonia is monophyletic, ii) a remarkable level of geographical phylogenetic structure, and iii) a widespread absence …

Race And Justice In Mississippi's Central Piney Woods, 1940-2010, Patricia Michelle Buzard-Boyett

Dissertations

“Race and Justice in Mississippi’s Central Piney Woods, 1940-2010,” examines the black freedom struggle in Jones and Forrest counties. The writer concludes that more than any other region of Mississippi, the Central Piney Woods became the pivotal theater in the war for racial justice because the intensity of its racial oppression combined with its unparalleled suffrage campaign, and watershed street protests forced a federal alliance, instigated landmark court rulings, and generated black political victories that lay the foundations for a more equitable racial order. To obtain a broader perspective on the forces that transformed racial justice over time, this community …

Outsiders Within: A Framing Analysis Of Eight Black And White U.S. Newspapers' Coverage Of The Civil Rights Movement, 1954-1964, Yolanda Denise Campbell

Dissertations

This study offers an important contribution to communication research about how Black and White Newspapers covered one of the most significant periods of racial unrest in the history of the U.S. besides slavery—the Civil Rights Movement. Specifically, this paper examined the unique combination of eight U.S. newspapers—The Pittsburgh Post-Gazette, The Pittsburgh Courier, The Birmingham News, The Birmingham World, The Clarion Ledger, The Jackson Advocate, The Chicago Tribune, and The Chicago Defender from 1954-1964, the beginning and end of the Civil Rights Movement. Through a qualitative framing analysis of the eight newspapers exploring the …

Pre-Kindergarten And Kindergarten Teachers' Perceptions Of Kindergarten Readiness, Joshua Aaron Bressler

Dissertations

The purpose of this study was to determine if there was a difference in perception between pre-kindergarten and kindergarten teachers on kindergarten readiness. In addition, this study sought to find out if there was any difference in PEAK assessment scores between those students who attended pre-kindergarten versus those students who did not attend pre-kindergarten.

The instruments used for this research were the Pascagoula Early Assessment for Kindergarten (PEAK) scores and the Kindergarten Readiness Questionnaire. The PEAK scores measured students‟ readiness by assessing their knowledge on language, writing communication, math, and fine motor development from the onset upon entering kindergarten. The …

One-To-One Laptop Project: Perceptions Of Teachers, Parents, And Students, Matthew D. Constant

Dissertations

One-to-one laptop programs are becoming more prevalent across the world in K-12 institutions. School districts are searching for more engaging tools that seek to have impact on school success, such as grade achievement, college/career preparation, and/or 21st-century skill preparation and attainment. Additionally, boards of education continuously want some positive indication of the return on their substantial financial investment.

This study utilized surveys of three important stakeholder groups (parents, students, and teachers) related to a one-to-one laptop project in a moderately-sized rural Midwestern school district. Perceptions about how often laptops were used in the classroom setting and across content areas (Language …

Motivation For High School Students To Read:Differences Among Student Perceptions And Differences Between Student And Teacher Perceptions, Angela Dawn Gunter

Dissertations

Many high school teachers are unaware of, or mistaken about, specific strategies and practices that actually motivate their students to read, and that what motivates one group of students may not motivate another. Although content-area instructors may not have been trained in teaching reading strategy and may feel as though teaching reading is not their job, it is an expectation that could largely be met by the implementation of motivational strategies.

This exploratory study utilized the expectancy theory of motivation and wasconducted to determine which strategies and practices would be most motivational for high school students to read. In a …

Bitter-Sweet Home: The Pastoral Ideal In African-American Literature, From Douglass To Wright, Robyn Merideth Preston-Mcgee

Dissertations

Discussions of the pastoral mode in American literary history frequently omit the complicated relationship between African Americans and the natural world, particularly as it relates to the South. The pastoral, as a sensibility, has long been an important part of the southern identity, for the mythos of the South long depended upon its association with a new “Garden of the World” image, a paradise dependent upon slave labor and a racial hierarchy to sustain it. For African Americans, the rural South has been both a home and a place of violence and oppression, particularly during the period of slavery through …

"Reading" The Apprentice: Commerce, Culture, And The Manufacturing Of Reality, Sharon Simpson Terrell

Dissertations

This study examines the six original seasons of the reality television series The Apprentice as a postmodern, cultural artifact. Grounded in Burke’s (1967) “literature as equipment for living,” and Brummett’s (1984) consideration that televised content constitutes literature, the theory of “televised discourse as equipment for living” provided the guide to examine the series. Hall’s (1980) “reading against the grain” oppositional reading technique was utilized to interrogate both the manifest and latent content. The content of the series may indeed provide the audience with a guide to ideological beliefs of both commerce and culture, thereby creating a manufactured reality for its …

Full Court Press: How Mississippi Newspapers Helped Keep State College Basketball Segregated, 1955-1973, Jason Ashley Peterson

Dissertations

During the civil rights era, Mississippi was cloaked in the hateful embrace of the Closed Society, historian James Silver’s description of the white caste systems that used State’s Rights to enforce segregation and promote the subservient treatment of blacks. Surprisingly, challenges from Mississippi’s college basketball courts brought into question the validity of the Closed Society and its unwritten law, a gentleman’s agreement that prevented college teams in the Magnolia State from playing against integrated foes. Led by Mississippi State University’s (MSU) basketball team, which won four Southeastern Conference championships in a five-year span, the newspapers in Mississippi often debated the …

Running In Absentia, Jeffrey David Tucker

Dissertations

Running in Absentia is a collection of short fiction, short-short fiction (also known as flash fiction), and poetry, with a critical introduction.

Examining Nursing Presence In The Acute Care Setting As An Indicator Of Patient Satisfaction With Nursing Care, Wendy Hansbrough Phd, Msn, Rn

Dissertations

Nursing presence is conceptualized as occurring within the nurse-patient relationship when the nurse acknowledges the uniqueness of the patient, within his or her context of being and chooses to intervene on the patient's behalf with a patient who allows the nurse into a reciprocal relationship. Nursing presence is described as occurring in varying levels and nurse expertise is suggested as one antecedent. Quantification of nursing presence would be useful in examination of nursing care outcomes, quality management and research. The Presence of Nursing Scale, PONS (Kostovich, 2002) was used in this study to test its reliability and determine its validity …

The Post Deployment Lived Experience Of U.S. Military Troops After Combat-Related Blast Exposure, Shirely A. Jett Phd

Dissertations

Blast-induced neurotrauma (BINT) is a newly emerging re-occurrence of an old combat-related injury in U.S. military troops returning from deployment in Afghanistan and Iraq. BINT is leading to a silent epidemic of symptomatic troops who face barriers to accessing healthcare and suffer debilitating symptoms in silence. The purpose of this hermeneutic phenomenological study was to discover the meaning of the lived experience of U.S. troops returning from Afghanistan and Iraq after combat-related blast exposure. Eleven service members and veterans ranging in age from 21 to over 30 years old participated in semi-structured face to face interviews. These service members and …

Emergence Delirium In U.S. Military Combat Veterans, Jason M. Mcguire Phd, Crna

Dissertations

This dissertation study examined the phenomenon of emergence delirium in U.S. military combat veterans. Emergence delirium is a post-anesthetic phenomenon that occurs immediately following emergence from general anesthesia and is characterized by agitation, confusion, and violent physical and/or verbal behavior. Clinical evidence suggests that emergence delirium is occurring with greater frequency among military personnel returning from conflict in the Middle East. This body of work is a culmination of three distinctive phases and is presented in three individual manuscripts. The first manuscript, "Risk Factors for Emergence Delirium in U.S. Military Members," was published in the Journal of PeriAnesthesia Nursing with …

Nutritional Status And Clinical Outcomes Of Residents Admitted To A Nursing Home, Sheryl Nespor Phd

Dissertations

Purpose The purpose of this research study was to describe the nutritional status (well nourished, at risk for malnutrition, or malnourished) of residents admitted to nursing homes and adverse clinical outcomes in those residents after four weeks. Methodology A descriptive, correlational design utilizing medical record data was used to examine the relationship between nutritional status and adverse clinical outcomes of weight loss and pressure ulcers. Results The sample (n=69) was predominately Caucasian (90%) with 38% having one or more pressure ulcers on admission. Most of the residents were admitted from an acute care facility (97%) and were either malnourished or …

California School Nurse Survey, Rachel Van Niekerk Phd

Dissertations

The purpose of this study was to obtain evidence to support the assumption that school nurses have a positive effect on school attendance and medication administration practices and to hear the voice of the California school nurse. Data from this exploratory, descriptive study came from an online researcher developed survey consisting of both forced choice and open-ended questions completed by California school nurses representing the three major regions of California (Northern, Central, and Southern). The following three research questions guided the study: 1) What is the relationship between school and nurse factors on student outcomes? 2) How valued do California …

Tapping The Hidden Job Market Through Informational Interviews: A Qualitative Examination Of Students' And Professionals' Perspectives, Kimberly S. Hogelucht Phd

Dissertations

A growing body of literature suggests that networking promotes not only learning about one's field of interest but also employment opportunities, without requiring a formal job search. Considering three-fourths of job openings are never advertised (Koss-Feder, 1999), it appears networking is a powerful strategy in successful job attainment. This study focuses on a less-than-obvious networking strategy, the informational interview. An informational interview is an interview with a professional that is conducted by a student or job seeker with the intention of finding out more about the professional's occupation or career field. In this study, informational interviews were examined, not only …

Parental Support Of Latinos In Higher Education, Maria Lorena Meza Phd

Dissertations

Many universities grapple with Latino student retention issues. Latinos are the largest and fastest-growing ethnic group in the United States, yet they also are the group that has the least amount of formal education. The literature suggests that parental support helps Latinos succeed academically in elementary, middle, and high schools. However, there has been little research on how or even whether Latino parental support influences academic success at the postsecondary level. Consequently, there is a lack of knowledge about (a) Latino parental behavior and attitudes during the years their children attend college and (b) the relationship between parents' behavior and …

What Do They Say? Students From A Private, Faith-Based, Four-Year University Share Their Perspectives On College As A Mentoring Environment, Jeffrey Andrew Bolster Edd

Dissertations

Research indicates that the term mentor in the context of higher education currently has multiple definitions and is used to describe a variety of programs, efforts, and formal as well as informal activities. In recent years, interdisciplinary perspectives on traditional undergraduate students have been converging around the idea that the functions and characteristics of mentoring students could be shared across the institution, creating what Daloz Parks (2000) has called a mentoring environment. This sharing of responsibility has the possibility to address what Baxter Magolda (2009) has recently identified as missing in higher education, a "holistic, theoretical perspective to promote the …