An Assessment of the Use of Student Price Response Models to Predict Changes in Undergraduate Enrollment at a Metropolitan University

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Most colleges and universities invest substantial resources in an effort to strategically plan for a sound financial base. The revenue for the financial base is dependent on student enrollment that must be effectively managed. Increases in the price of tuition and fees can lead to decreased enrollment and negatively impact the revenue of an institution. The increases can also impact the enrollment of certain student populations such as minority students and high school graduates enrolling in college for the first time. Many studies have analyzed the price elasticity and student price response models that have been developed over time by reviewing historical price increases and enrollment across institutions. Few studies have used the models to predict changes in the enrollment of students for one college or university after the increases in the cost of attendance are imposed on students. This study sought to analyze the effectiveness of the most commonly reviewed student price response and price elasticity models in predicting changes in undergraduate enrollment at one metropolitan academic university. The three models introduced by Leslie and Brinkman, St. John and Heller were used to analyze the tuition and fee increases and to identify the likely percentage of increase or decrease …
Date: December 2004
Creator: Saxon, Randall J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Barrier and Long Term Creep Properties of Polymer Nanocomposites.

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The barrier properties and long term strength retention of polymers are of significant importance in a number of applications. Enhanced lifetime food packaging, substrates for OLED based flexible displays and long duration scientific balloons are among them. Higher material requirements in these applications drive the need for an accurate measurement system. Therefore, a new system was engineered with enhanced sensitivity and accuracy. Permeability of polymers is affected by permeant solubility and diffusion. One effort to decrease diffusion rates is via increasing the transport path length. We explore this through dispersion of layered silicates into polymers. Layered silicates with effective aspect ratio of 1000:1 have shown promise in improving the barrier and mechanical properties of polymers. The surface of these inorganic silicates was modified with surfactants to improve the interaction with organic polymers. The micro and nanoscale dispersion of the layered silicates was probed using optical and transmission microscopy as well as x-ray diffraction. Thermal transitions were analyzed using differential scanning calorimetry. Mechanical and permeability measurements were correlated to the dispersion and increased density. The essential structure-property relationships were established by comparing semicrystalline and amorphous polymers. Semicrystalline polymers selected were nylon-6 and polyethylene terephthalate. The amorphous polymer was polyethylene terphthalate-glycol. Densification …
Date: December 2004
Creator: Ranade, Ajit
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Brownian Movement and Quantum Computers

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This problem in lieu of thesis is a discussion of two topics: Brownian movement and quantum computers. Brownian movement is a physical phenomenon in which the particle velocity is constantly undergoing random fluctuations. Chapters 2, 3 and 4, describe Brownian motion from three different perspectives. The next four chapters are devoted to the subject of quantum computers, which are the signal of a new era of technology and science combined together. In the first chapter I present to a reader the two topics of my problem in lieu of thesis. In the second chapter I explain the idea of Brownian motion, its interpretation as a stochastic process and I find its distribution function. The next chapter illustrates the probabilistic picture of Brownian motion, where the statistical averages over trajectories are related to the probability distribution function. Chapter 4 shows how to derive the Langevin equation, introduced in chapter 1, using a Hamiltonian picture of a bath with infinite number of harmonic oscillators. The chapter 5 explains how the idea of quantum computers was developed and how step-by-step all the puzzles for the field of quantum computers were created. The next chapter, chapter 6, discus the basic quantum unit of information …
Date: December 2004
Creator: Habel, Agnieszka
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Callus Development and Organogenesis in Cultured Explants of Cowpea (Vigna unguiculata (L.) Walp

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Cowpea, Vigna unguiculata (L.) Walp is an excellent source of protein, vitamins and minerals and a major food crop many parts of Africa. Optimal production levels are hampered by insect pests and diseases. Biotechnological techniques such as tissue culture and genetic engineering can aid in the development of varieties with resistance to insect pests and diseases. The objective of this study was to investigate conditions necessary for the development of a reproducible tissue culture system that can be applied to regenerate transformed cells from culture. The in vitro manipulation of cowpea using Murashige and Skoog (MS) medium, auxins and cytokinins resulted in the formation of callus and rhizogenesis. Calli that were formed were separated into six classes based on color and texture. Yellowish friable callus, yellowish compact, soft yellowish callus and green and white were composed of largely vacuolated cells and were non-regenerative. Friable green callus was the most prevalent callus type and could form of roots in some hormone combinations. Green spots were formed on hard compact green callus. The green spots became nodular, forming root primordia and ultimately giving rise to roots. None of the six calli types gave rise to the formation of shoots. Embryogenic callus was …
Date: December 2004
Creator: Omwenga, George Isanda
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Confederate Pension Systems in Texas, Georgia, and Virginia: The Programs and the People

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The United States government began paying pensions to disabled Union veterans before the Civil War ended in April 1865. By 1890 its pension programs included any Union veteran who had fought in the Civil War, regardless of his financial means, as well as surviving family members, including mothers, fathers, brothers, and sisters. Union veterans did not hesitate to "wave the bloody shirt" in their attempts to liberalize pension laws. Pension programs for Confederate veterans were much slower to develop. Lacking any higher organization, each southern state assumed the responsibility of caring for disabled and/or indigent Confederate veterans and widows. Texas began paying Confederate pensions in 1899, Georgia in 1888 and Virginia in 1889. Unlike Texas, Georgia and Virginia provided artificial limbs for their veterans long before they started paying pensions. At the time of his enlistment in the 1860s, the typical future pensioner was twenty-five years of age, and fewer than half were married heads of households. Very few could be considered wealthy and most were employed in agriculture. The pensioners of Georgia, Texas, and Virginia were remarkably similar, although there were some differences in nativity and marital status. They were all elderly and needy by the time they asked …
Date: December 2004
Creator: Wilson, Mary L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Destruction of a Society: A Qualitative Examination of the Use of Rape as a Military Tool

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This thesis explores the conditions under which mass rapes are more likely to be incorporated into the strategy of military or paramilitary groups during periods of conflict. I examine three societies, Rwanda , the former Yugoslavia , and Cambodia in a comparative analysis. To determine what characteristics make societies more likely to engage in rape as a military tool, I look at the status of women in the society, the religious cultures, the degree of female integration into the military institutions, the cause of the conflicts, the history of the conflict, and finally, the status of minority ethnic groups in each of these societies.
Date: December 2004
Creator: Finley, Briana Noelle
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Equity of access: Exploring Internet connectivity within Oklahoma public schools.

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The purpose of this study was to ascertain if conditions or combinations of conditions existed within Oklahoma public schools that created inequities in the availability of classroom Internet connections. A stratified random sample of the 471 school districts was used to identify 300 specific schools for the purpose of data analysis. Data was gathered utilizing a database provided by the Oklahoma State Department of Education and a researcher developed questionnaire. The database provided data relating to four independent variables (region, district size, school type, and school size,). The dependent variable, percentage of classrooms connected to the Internet, was obtained by the researcher designed questionnaire. The state database also provided percentage information relating to students who qualify as minorities and qualify for free or reduced lunches. The data was tested using a series of ANOVAs and a Pearson product-moment correlation coefficient. The findings of the study are as follows: (a) The analysis of variance showed that none of the independent variables had a significant effect upon the percentage of classrooms connected to the Internet; (b) The Pearson product-moment correlation coefficient revealed little or no correlation between the percentage of disadvantaged or minority students and the percentage of classroom Internet connections.
Date: December 2004
Creator: Garrett, Galen
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Hamiltonian cycles in subset and subspace graphs.

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In this dissertation we study the Hamiltonicity and the uniform-Hamiltonicity of subset graphs, subspace graphs, and their associated bipartite graphs. In 1995 paper "The Subset-Subspace Analogy," Kung states the subspace version of a conjecture. The study of this problem led to a more general class of graphs. Inspired by Clark and Ismail's work in the 1996 paper "Binomial and Q-Binomial Coefficient Inequalities Related to the Hamiltonicity of the Kneser Graphs and their Q-Analogues," we defined subset graphs, subspace graphs, and their associated bipartite graphs. The main emphasis of this dissertation is to describe those graphs and study their Hamiltonicity. The results on subset graphs are presented in Chapter 3, on subset bipartite graphs in Chapter 4, and on subspace graphs and subspace bipartite graphs in Chapter 5. We conclude the dissertation by suggesting some generalizations of our results concerning the panciclicity of the graphs.
Date: December 2004
Creator: Ghenciu, Petre Ion
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The impact of leisure travelers' characteristics on hotel Website attributes preference.

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Travel is now the largest online business-to-consumer product in the United States. Online hotel bookings are the second largest segment of online travel. Leisure travelers online spending will increase dramatically from 2002 to 2007. However, a majority of hospitality companies do not currently take advantage of the Internet as the cheapest and most efficient distribution medium. The purpose of this study examined leisure travelers' demographic and psychographic characteristics, online booking and travel frequency that influence travelers' desired hotel Website features and functions. The results found out that demographics (gender, occupation, and ethnicity), and psychographics (travel benefit sought), number of leisure travel trips per year, and number of online hotel bookings per year have impact on hotel Website attribute preferences.
Date: December 2004
Creator: Zhang, Li
Object Type: Thesis or Dissertation
System: The UNT Digital Library

An Investigation into how CACREP Accredited Institutions meet the CACREP Practicum Standards

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This study was designed to determine how institutions accredited by the Council for the Accreditation of Counseling and Related Educational Programs (CACREP) meet the practicum requirements set forth in CACREP's 2001 standards. Practicum is a vital part of the matriculation process of counselors in training. This clinical based course allows students to practice the skills they have learned in previous, more didactic based courses. Trainees can stretch skills, all under the watch of a counselor supervisor with greater experience. Although CACREP instructs all accredited counseling programs to have such a course in place, the standards are not specific. Schools are often interpreting the standards in a multitude of ways, presumably to successfully meet the standards while still serving the student as well as the clientele who seek out mental health assistance (Pitts, 1992a). The purpose of this study was to determine what measures CACREP accredited institutions enact to meet the clinical practicum standards. The difference between this study and prior research that has addressed the practicum requirement is that the instrument used in this study specifically addressed every CACREP practicum standard, including technology, diversity, and concerns with supervision and meeting the direct client contact hour requirement. The results of the …
Date: December 2004
Creator: Muro, Joel Hart
Object Type: Thesis or Dissertation
System: The UNT Digital Library

An NMR Study of Trimethylsilylmethyllithium Aggregates and Mixed Trimethylsilylmethyllithium/Lithium trimethylsilylmethoxide Aggregates

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An NMR spectroscopy study of trimethylsilylmethyllilthium, TMSM-Li, indicates that TMSM-Li exists as two different aggregates in cyclopentane solution. Using previously reported colligative properties of TMSM-Li in different solutions in connection with new 13C and 6Li NMR data collected in this study, aggregation states were assigned as octamer and hexamer. Low temperature 13C and 6Li NMR peak intensities indicated an equilibrium exists between the two aggregates that shifts toward the octamer as the temperature decreases. ΔH was calculated to be 5.23 + 0.15 kcal/mol and ΔS was calculated to be 17.9 + 0.6 eu for the hexamer/octamer equilibrium system. Samples of TMSM-Li were mixed with TMSM-OH in attempts to form mixed alkyllithium/lithium alkoxide aggregates. 13C NMR data for these mixtures gave inconclusive results whether or not these compounds formed, which is different from other primary alkyllithium compounds studied in the past. A study of neopentyllithium, NpLi, indicates only one aggregate in solution with the aggregation state unknown using low temperature 13C NMR spectroscopy.
Date: December 2004
Creator: Medley, Marilyn S.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

De novo prediction of the ground state structure of transition metal complexes.

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One of the main goals of computational methods is to identify reasonable geometries for target materials. Organometallic complexes have been investigated in this dissertation research, entailing a significant challenge based on transition metal diversity and the associated complexity of the ligands. A large variety of theoretical methods have been employed to determine ground state geometries of organometallic species. An impressive number of transition metals entailing diverse isomers (e.g., geometric, spin, structural and coordination), different coordination numbers, oxidation states and various numbers of electrons in d orbitals have been studied. Moreover, ligands that are single, double or triple bonded to the transition metal, exhibiting diverse electronic and steric effects, have been investigated. In this research, a novel de novo scheme for structural prediction of transition metal complexes was developed, tested and shown to be successful.
Date: December 2004
Creator: Buda, Corneliu
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Past tense marking in Chinese-English interlanguage.

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This data study concentrates on the past tense marking in the interlanguage (IL) of Chinese speakers of English. Following the assumptions of Hawkins & Lizska, (2003), it is assumed that unlike native speakers of English, Chinese speakers of English have a higher level of optionality within the past tense marking of their grammars. It is claimed that the primary reason for this occurrence is the lack of the functional feature T(ense) [+/-past] in Mandarin Chinese. If a particular functional feature is missing in a learner's L1 grammar, it is thought that it will be absent in one's L2 grammar as well. Three advanced Chinese speakers of English were tested on the past tense marking in their IL production. Both spontaneous oral and reading speech were used for this data analysis.
Date: December 2004
Creator: Flahive, Patrick J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Peptide-based hidden Markov model for peptide fingerprint mapping.

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Peptide mass fingerprinting (PMF) was the first automated method for protein identification in proteomics, and it remains in common usage today because of its simplicity and the low equipment costs for generating fingerprints. However, one of the problems with PMF is its limited specificity and sensitivity in protein identification. Here I present a method that shows potential to significantly enhance the accuracy of peptide mass fingerprinting, using a machine learning approach based on a hidden Markov model (HMM). This method is applied to improve differentiation of real protein matches from those that occur by chance. The system was trained using 300 examples of combined real and false-positive protein identification results, and 10-fold cross-validation applied to assess model discrimination. The model can achieve 93% accuracy in distinguishing correct and real protein identification results versus false-positive matches. The receiver operating characteristic (ROC) curve area for the best model was 0.833.
Date: December 2004
Creator: Yang, Dongmei
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Police Officer Burnout: An Examination of Officer Stress, the Policing Subculture and the Advantages of Family Counseling

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The work of a police officer is stressful and could potentially lead to burnout. As a result, a variety of reactions may occur which include, cynicism, abuse of authority, and in extreme cases suicide. One method which has been proven to be effective in treating officer stress is counseling; however, because of the policing subculture the opportunity to seek counseling has been ignored. In order to successfully manage officer stress, the subculture must be dealt with. Additionally, the officers' family must also be acknowledged as being affected by officer burnout. Counseling services must be made available to the officer's family and through training they can become a source of support instead of an added source of stress to the officer.
Date: December 2004
Creator: Yanez, Luiz
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Reconsidering the Lament: Form, Content, and Genre in Italian Chamber Recitative Laments: 1600-1640

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Scholars have considered Italian chamber recitative laments only a transitional phenomenon between madrigal laments and laments organized on the descending tetrachord bass. However, the recitative lament is distinguished from them by its characteristic attitude toward the relationship between music and text. Composer of Italian chamber recitative laments attempted to express more subtle, refined and sometimes complicated emotion in their music. For that purpose, they intentionally created discrepancies between text and music. Sometimes they even destroy the original structure of text in order to clearly deliver the composer's own voice. The basic syntactic structure is deconstructed and reconstructed along with their reading and according to their intention. The discrepancy between text and music is, however, expectable and natural phenomena since text cannot be completely translated or transformed to music and vice versa. The composers of Italian chamber recitative laments utilized their innate heterogeneity between two materials (music and text) as a metaphor that represents the semantic essence of the genre, the conflict. In this context, Italian chamber recitative laments were a real embodiment of the so-called seconda prattica and through the study of them, finally, we more fully able to understand how the spirit of late Renaissance flourished in Italy in …
Date: December 2004
Creator: Chung, Kyung-Young
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Religiousness, current substance use, and early risk indicators for substance abuse and dependence among nursing students.

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The purposes of this study were to examine the prevalence of current substance use and early risk indicators for substance abuse and dependence, and to investigate the relationships among religiousness, current substance use, and early risk indicators among nursing students at seven Seventh-day Adventist colleges. Data for this descriptive study were collected through Efinger's Alcohol Risk Survey (EARS) (Efinger, 1984), the CAGE Questionnaire ( Ewing , 1984), and the Intrinsic/Extrinsic-Revised Scale (Gorsuch & McPherson, 1989). Participants were 241 nursing students enrolled in their first year of nursing courses at seven colleges and universities located across the United States . Findings indicated that 42% of students scored higher than the EARS mean; 24% reported current substance use; and 15% scored in the probable abuse/dependence category of CAGE. Students who reported current substance use and those scoring in the probable substance abuse/dependence category were significantly more likely to score above the EARS median. Intrinsic religiousness demonstrated a significant inverse relationship with current substance use. Significantly lower rates of current substance use were associated with higher rates of attendance at religious services. Respondents who indicated that their religion prohibited alcohol consumption reported significantly lower rates of current substance use than those who answered …
Date: December 2004
Creator: Gnadt, Bonnie
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Role of Violence in Hunt County, Texas, during Reconstruction

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The post Civil War period known as Reconstruction remains a topic of interest for historians. Having avoided the experience of invasion by Northern troops during the Civil War, the people living in the interior of the state of Texas accepted Confederate defeat at first. However, with the instituting of Northern efforts at Reconstruction, such as the installation of Republican interim government officials, the arrival of Freedmen's Bureau agents, and in some parts the stationing of federal troops, conservative whites throughout the state became defiant toward the federal government and its policies. Some white southerners even went so far as to take up arms and become embroiled in open conflict with the federal government and its local institutions. As a result, Unionist whites and freedmen found themselves to be the targets of groups of desperados committed to upholding the Southern Cause and ensuring the return of the conservative Democratic party to power in Texas politics. This study focuses on Hunt County from the years 1860 - 1873 to determine to what extent violence played a role in the era of Reconstruction. An analysis of data primarily from county, state, and federal records forms the basis of this study. The information obtained …
Date: December 2004
Creator: Hathcock, James A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Selected Lute Music from Paris, Rés. Vmd. Ms. 27 from the Bibliothèque Nationale: Reconstruction, Edition, and Commentary

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Paris . Rés. Vmd. Ms. 27, known as Tl.1, or the Thibault Manuscript, is one of the earliest extant sources of lute music, containing twenty-four solos and eighty-six accompaniments for vocal compositions. The manuscript was copied in Italian lute tablature lacking rhythm signs, which makes it inaccessible for modern performance. Each selection contains a full score of the four-part vocal concordance, and the reconstructed lute part in both the original notation and keyboard transcription. The introductory study elaborates upon the creation dates for Tl.1 (ca. 1502-1512) through its relationship with the sources of the time and with the older unwritten tradition of Italian secular music that is apparent in the formal treatment of the music.
Date: December 2004
Creator: Sequera, Héctor J.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The "Sixties" Come to North Texas State University, 1968-1972

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North Texas State University and the surrounding Denton community enjoyed a quiet college atmosphere throughout most of the 1960s. With the retirement of President J. C. Matthews in 1968, however, North Texas began witnessing the issues most commonly associated with the turbulent decade, such as the struggle for civil rights, the anti-Vietnam War movement, the fight for student rights on campus, and the emergence of the Counterculture. Over the last two years of the decade, North Texas State University and the surrounding community dealt directly with the 1960s and, under the astute leadership of President John J. Kamerick, successfully endured trying times.
Date: December 2004
Creator: Phelps, Wesley Gordon
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Solid phase microextraction of amino-dinitrotoluenes in tissue.

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TNT (2,4,6-trinitrotoluene) readily and predominantly transforms to 2ADNT (2-amino-4,6-dinitrotoluene) and 4ADNT (4-amino-2,6-dinitrotoluene) in environmental matrixes and tissues. Solid phase microextraction (SPME) was used to extract ADNTs (amino-dinitrotoluenes) from tissue as a potential method to investigate the recalcitrance of metabolically-generated ADNTs versus absorbed ADNTs. Tubifex tubifex was allowed to metabolize TNT into ADNTs in 24-hr static non-renewal exposure test followed by 24-hr depuration in clean reconstituted hard water. Polyacrylate-coated (PA) SPME fibers were then deployed and agitated in tissue homogenates containing metabolically-generated ADNTs for 48 hr to provide a measure of available ADNTs. Extractability of ADNTs from T. tubifex tissue containing metabolically-generated ADNTs was significantly less than extractability of ADNTs from T. tubifex tissue containing absorbed ADNTs: 50-60% and 81-90% of expected extractability based on fiber-water partition ratio. The lower SPME extractability of metabolically-generated ADNTs may stem from the unavailability of metabolically-generated ADNTs sequestered in tissue or bound to tissue macromolecules during metabolism of TNT to ADNT. Tissue extractions using SPMEs may be able to estimate such bound organic residues in tissue and serve as potential indicators of toxicological bioavailability and biomagnification potential of tissue-associated organic compounds.
Date: December 2004
Creator: Tsui-Bowen, Alethea
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Transplants

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The body of work originating from this Problem in Lieu of Thesis consists of paintings on canvas that incorporate representations of plant material. The impetus for the paintings was black and white photocopies created from mounds of plant material placed on a copy machine. The resulting copies contained forms that were organic in appearance, but unrecognizable as known objects. Parts of the most interesting and ambiguous copies were used to develop the imagery of the paintings. The new forms served the purpose of creating visual interest from unexpected images. Combined with traditional painting techniques, the selected forms produced paintings of mysterious and playful worlds similar to those parts of the environment not readily accessed, such as galactic space, microscopic organisms, and ocean depths.
Date: December 2004
Creator: Holden, Susan Morrow
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Treatment efficacy in a chronic pain population: Pre- to post-treatment.

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The purpose of the current study was to investigate the effects of a multidisciplinary pain management program on five measures of subjective psychosocial factors. Ninety-five participants in the comprehensive multidisciplinary treatment group and the standard medical intervention control group were surveyed about various psychosocial factors using Axis II of the West Haven - Yale Multidimensional Pain Inventory (MPI), pre- to post-treatment. It was hypothesized that post-treatment levels would be significantly lower than pre-treatment levels for all five psychosocial variables. Additionally, gender and ethnicity variables were examined. Based on preliminary analyses indicating pre-treatment differences between the experimental and control group, five 2 x 2 x 3 analyses of covariances (ANCOVAs) were used to examine the above hypotheses. Results indicated significant differences between the treatment conditions on measures of control, with the comprehensive group feeling more in control than the standard group at post-treatment. No other significant main effects for treatment condition were found on the measures of pain severity, interference with daily activities, negative mood, or social support. However, a significant gender main effect was found for social support at post-treatment, with females reporting more social support than males. A significant gender x ethnicity interaction was also found for post-treatment control, …
Date: December 2004
Creator: Bernstein, Dana N.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Voting Operating System (VOS)

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The electronic voting machine (EVM) plays a very important role in a country where government officials are elected into office. Throughout the world, a specific operating system that tends to the specific requirement of the EVM does not exist. Existing EVM technology depends upon the various operating systems currently available, thus ignoring the basic needs of the system. There is a compromise over the basic requirements in order to develop the systems on the basis on an already available operating system, thus having a lot of scope for error. It is necessary to know the specific details of the particular device for which the operating system is being developed. In this document, I evaluate existing EVMs and identify flaws and shortcomings. I propose a solution for a new operating system that meets the specific requirements of the EVM, calling it Voting Operating System (VOS, pronounced 'voice'). The identification technique can be simplified by using the fingerprint technology that determines the identity of a person based on two fingerprints. I also discuss the various parts of the operating system that have to be implemented that can tend to all the basic requirements of an EVM, including implementation of the memory manager, …
Date: December 2004
Creator: Venkatadusumelli, Kiran
Object Type: Thesis or Dissertation
System: The UNT Digital Library