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  Partner: UNT Libraries
 Language: English
 Collection: UNT Theses and Dissertations
Boosting for Learning From Imbalanced, Multiclass Data Sets

Boosting for Learning From Imbalanced, Multiclass Data Sets

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Date: December 2013
Creator: Abouelenien, Mohamed
Description: In many real-world applications, it is common to have uneven number of examples among multiple classes. The data imbalance, however, usually complicates the learning process, especially for the minority classes, and results in deteriorated performance. Boosting methods were proposed to handle the imbalance problem. These methods need elongated training time and require diversity among the classifiers of the ensemble to achieve improved performance. Additionally, extending the boosting method to handle multi-class data sets is not straightforward. Examples of applications that suffer from imbalanced multi-class data can be found in face recognition, where tens of classes exist, and in capsule endoscopy, which suffers massive imbalance between the classes. This dissertation introduces RegBoost, a new boosting framework to address the imbalanced, multi-class problems. This method applies a weighted stratified sampling technique and incorporates a regularization term that accommodates multi-class data sets and automatically determines the error bound of each base classifier. The regularization parameter penalizes the classifier when it misclassifies instances that were correctly classified in the previous iteration. The parameter additionally reduces the bias towards majority classes. Experiments are conducted using 12 diverse data sets with moderate to high imbalance ratios. The results demonstrate superior performance of the proposed method compared ...
Contributing Partner: UNT Libraries
Finitness and Verb-Raising in Second Language Acquisition of French by Native Speakers of Moroccan Arabic

Finitness and Verb-Raising in Second Language Acquisition of French by Native Speakers of Moroccan Arabic

Date: August 1996
Creator: Aboutaj, Heidi H. (Heidi Huttar)
Description: In this thesis, the three hypotheses on the nature of early L2 acquisition (the Full Transfer/Full Access view of Schwartz and Sprouse (e.g., 1996), the Minimal Trees view of Vainikka and Young-Scholten (e.g., 1996), and the Valueless Features view of Eubank (e.g., 1996)), are discussed. Analysis of the early French production by two native speakers of Moroccan Arabic is done to determine if the L1 grammar is transferred onto the L2 grammar. In particular, the phenomena of verb-raising (as determined by the verb's position vis-a-vis negation) and finiteness are examined. The results of this study indicate that the relevant structures of Moroccan Arabic do not transfer onto the emerging French grammar.
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Derivatives of 1,4-Naphthoquinone and 1,4-Anthraquinone

Derivatives of 1,4-Naphthoquinone and 1,4-Anthraquinone

Date: August 1959
Creator: Aboytes, Peter
Description: The purpose of this investigation was the synthesis of some 1,4-naphthoquinones and 1,4-anthraquinones. It will be shown that some of these substituted quinones exhibit physiological properties.
Contributing Partner: UNT Libraries
Development of a Cost Effective Wireless Sensor System for Indoor Air Quality Monitoring Applications

Development of a Cost Effective Wireless Sensor System for Indoor Air Quality Monitoring Applications

Date: May 2014
Creator: Abraham, Sherin
Description: Poor air quality can greatly affect the public health. Research studies indicate that indoor air can be more polluted than the outdoor air. An indoor air quality monitoring system will help to create an awareness of the quality of air inside which will eventually help in improving it. The objective of this research is to develop a low cost wireless sensor system for indoor air quality monitoring. The major cost reduction of the system is achieved by using low priced sensors. Interface circuits had to be designed to make these sensors more accurate. The system is capable of measuring carbon dioxide, carbon monoxide, ozone, temperature, humidity and volatile organic compounds. The prototype sensor node modules were developed. The sensor nodes were the connected together by Zigbee network. The nodes were developed in such a way that it is compact in size and wireless connection of sensor nodes enable to collect air quality data from multiple locations simultaneously. The collected data was stored in a computer. We employed linear least-square approach for the calibration of each sensor to derive a conversion formula for converting the sensor readings to engineering units. The system was tested with different pollutants and data collected was ...
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An Art Program Utilizing Discarded Materials in the Improvement of Interiors of Homes of Children in a Low Income Group

An Art Program Utilizing Discarded Materials in the Improvement of Interiors of Homes of Children in a Low Income Group

Date: January 1960
Creator: Abram, W. B.
Description: The problem with which this investigation is concerned is that of planning and carrying out an art program in which a particular group of students in a low income group, by utilizing discarded and inexpensive materials, can create useful and satisfying objects for the improvement of their home interiors.
Contributing Partner: UNT Libraries
Ultrastructural Changes of Tumor Implants in Mice

Ultrastructural Changes of Tumor Implants in Mice

Date: January 1970
Creator: Abrams, Joe A.
Description: The purpose of this investigation was to observe the sequential ultrastructural changes in tumor implants of a well established tumor line in isologous mice.
Contributing Partner: UNT Libraries
Proton-Induced L-shell X-Rays of Pr, Sm, Eu, Gd, and Dy

Proton-Induced L-shell X-Rays of Pr, Sm, Eu, Gd, and Dy

Date: August 1974
Creator: Abrath, Frederick G.
Description: None
Contributing Partner: UNT Libraries
Diphenyloxazole Metabolism by Aryl Hydrocarbon Hydroxylase

Diphenyloxazole Metabolism by Aryl Hydrocarbon Hydroxylase

Date: December 1976
Creator: Abreu, Mary E.
Description: 2,5-Diphenyloxazole (PPO) was tested as a potential alternate inducer for the aryl hydrocarbon hydroxylase (AHH) system. Its apparent lack. of carcinogenicity and toxicity provide a possible system for investigation of enzyme systems related to chemical carcinogenesis without exposure of the researcher to potent carcinogenic compounds. These studies found PPO to be an inducer of AHH in cultured human lymphocytes. When PPO was utilized as a substrate for the AHH assay system, the major metabolites produced were strongly fluorescent. A simple fluorometric assay was developed which employed PPO as the substrate and which measured constitutive activity more efficiently than similar assays using benzo(a)pyrene as the substrate. Quantitation of both basal and induced lymphocyte AHH metabolism of PPO may be applicable to human population studies and may provide a tool to determine possible genetic variables with respect to carcinogen metabolism related to cancer risk.
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Immunoflorescence as a Method for the Rapid Identification of Streptococcus Faecalis in Water

Immunoflorescence as a Method for the Rapid Identification of Streptococcus Faecalis in Water

Date: August 1970
Creator: Abshire, Robert Louis
Description: None
Contributing Partner: UNT Libraries
Ultrafast Laser Sampling of a Plant Tissue and ion Conductivity Measurement for Investigation of Light Stress Generation Mechanisms

Ultrafast Laser Sampling of a Plant Tissue and ion Conductivity Measurement for Investigation of Light Stress Generation Mechanisms

Date: August 2010
Creator: Abtahi, Seyed Ali
Description: In this study we applied ultra-short laser pulses on a biological sample (Arabidopsis), in order to cut it precisely in a square pattern and subsequently use it for studying stress generation mechanisms. For this purpose, we utilized femtosecond laser pulses at 100 fs pulse width and 80 MHz repetition rate. We took two processing parameters into consideration such as laser power, laser exposure time which is related to the stage speed. Therefore, we were able to find the laser optimum conditions for ablation of biological tissues. The mutant and wildtype (control) obtained from laser cutting with a size of 500 µm × 500 µm were directly transferred (in-situ with laser cutting) into a microfabricated chamber containing ~500 nanoliters deionized water for measuring ion conductivity. The ion conductivity is a signature of cell-death mechanisms caused by various stresses. A light with intensity of 100 µmol was exposed to the samples for 2 hours and 20 minutes as a source of stress. A quantitative electrical analysis with high accuracy was assured by utilizing a microchamber, which enables a measurement in nanoliter volume. We measured the impedance which is reciprocal of conductivity using a lock-in amplifier and a precise current source at frequency ...
Contributing Partner: UNT Libraries
Application of Synthetic Peptides as Substrates for Reversible Phosphorylation

Application of Synthetic Peptides as Substrates for Reversible Phosphorylation

Date: August 1992
Creator: Abukhalaf, Imad Kazem
Description: Two highly homologous synthetic peptides MLC(3-13) (K-R-A-K-A-K-T-TK-K-R-G) and MLC(5-13) (A-K-A-K-T-T-K-K-R-G) corresponding to the amino terminal amino acid sequence of smooth muscle myosin light chain were utilized as substrates for protein kinase C purified from murine lymphosarcoma tumors to determine the role of the primary amino acid sequence of protein kinase C substrates in defining the lipid (phosphatidyl serine and diacylglycerol) requirements for the activation of the enzyme. Removal of the basic residues lysine and arginine from the amino terminus of MLC(3-13) did not have a significant effect on the Ka value of diacylglycerol. The binding of effector to calcium-protein kinase C appears to be random since binding of one effector did not block the binding of the other.
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An Analysis of Marketing in Saudi Arabia and American Marketing Executives' Knowledge About the Saudi Arabian Market

An Analysis of Marketing in Saudi Arabia and American Marketing Executives' Knowledge About the Saudi Arabian Market

Date: December 1981
Creator: Abunabaa, Abdelaziz M.
Description: None
Contributing Partner: UNT Libraries
Corporate Christians and Terrible Turks: Economics, Aesthetics, and the Representation of Empire in the Early British Travel Narrative, 1630 - 1780

Corporate Christians and Terrible Turks: Economics, Aesthetics, and the Representation of Empire in the Early British Travel Narrative, 1630 - 1780

Date: December 2003
Creator: Abunasser, Rima Jamil
Description: This dissertation examines the evolution of the early English travel narrative as it relates to the development and application of mercantilist economic practices, theories of aesthetic representation, and discourses of gender and narrative authority. I attempt to redress an imbalance in critical work on pre-colonialism and colonialism, which has tended to focus either on the Renaissance, as exemplified by the works of critics such as Stephen Greenblatt and John Gillies, or on the later eighteenth and early nineteenth centuries, as in the work of scholars such as Srinivas Aravamudan and Edward Said. This critical gap has left early travel narratives by Sir Francis Moore, Jonathan Harris, Penelope Aubin, and others largely neglected. These early writers, I argue, adapted the conventions of the travel narrative while relying on the authority of contemporary commercial practices. The early English travelers modified contemporary conventions of aesthetic representation by formulating their descriptions of non-European cultures in terms of the economic and political conventions and rivalries of the early eighteenth century. Early English travel literature, I demonstrate, functioned as a politically motivated medium that served both as a marker of authenticity, justifying the colonial and imperial ventures that would flourish in the nineteenth century, and as ...
Contributing Partner: UNT Libraries
Exploratory Analysis of Social E-health Behavior

Exploratory Analysis of Social E-health Behavior

Date: May 2014
Creator: Acadia, Spencer
Description: Extant literature has documented well that people seek health information via the internet as patients and consumers. Much less, however, is known about interaction and creation behaviors in the development of new online health information and knowledge. More specifically, generalizable sociodemographic data on who engages in this online health behavior via social media is lacking in the sociological literature. The term “social e-health” is introduced to emphasize the difference between seeking behaviors and interaction and creation behaviors. A 2010 dataset of a large nationally representative and randomly sampled telephone survey made freely available from the Pew Research Center is used to examine social e-health behavior according to respondents’ sociodemographics. The dependent variable of social e-health behavior is measured by 13 survey questions from the survey. Gender, race, ethnicity, age, education, and income are used as independent variables. Logistic regression analysis was used to determine the odds of engagement in social e-health behavior based on the sociodemographic predictors. The social determinants of health and digital divide frameworks are used to help explain why socioeconomic variances exist in social e-health behavior. The findings of the current study suggest that predictable sociodemographic patterns along the dimensions of gender, race, age, education, and income ...
Contributing Partner: UNT Libraries
Love Attitudes and Marital Adjustment Through Five Stages of the Marital Life-Cycle in Protestant Nigerian Society

Love Attitudes and Marital Adjustment Through Five Stages of the Marital Life-Cycle in Protestant Nigerian Society

Date: December 1988
Creator: Acho, Onyebuchi S. (Onyebuchi Sunday)
Description: This study examined the relationship between love attitude and marital adjustment across five stages of the marital life-cycle in Nigerian society. The subjects for this study were 202 volunteers from six protestant churches representing six cities in the southern part of Nigeria. An average of 20 couples were representatives of each of the five marital life-cycles. Each of the subjects completed the Love Attitude Inventory (LAI), and the Marital Adjustment Test (short form) (MAT). Wilk's multivariate analysis revealed no significant differences between husbands' and wives' love attitude and marital adjustment across the five stages of the marital life cycle. Multivariate analysis split-plot 5.2 with repeated measures revealed no significant difference for the total sample among the groups, but indicated a significant difference between love attitude and marital adjustment for the total sample using sex as a factor. A univariate test of the MAT and LAI indicated that the MAT accounted for the difference. A canonical correlation indicated a significant positive relationship between husbands1 and wives' marital adjustment and love attitude within each of the five groups. The findings suggest that husbands and wives included in this study have a good understanding of their roles in the marriage relationship and that ...
Contributing Partner: UNT Libraries
Cognitive Congruence and Interactional Behavior of Cotherapists

Cognitive Congruence and Interactional Behavior of Cotherapists

Date: August 1980
Creator: Achterberg, Gloria Jeanne
Description: None
Contributing Partner: UNT Libraries
Haves, Halves, and Have-Nots: School Libraries and Student Achievement in California

Haves, Halves, and Have-Nots: School Libraries and Student Achievement in California

Date: December 2008
Creator: Achterman, Douglas L.
Description: This descriptive, non-experimental study examines the strength of the relationship between California school library media programs and student achievement, using data from California criterion-referenced state-wide tests, publically available school and community demographic data, and a state survey of school library programs. Results indicate a substantial discrepancy in library staffing levels from the elementary grades through the high schools. Nevertheless, statistically significant correlations were found between certificated staffing levels and student achievement at each grade. Significant correlations persisted at the elementary and middle school when controlling for five of six school and community variables, and at the high school when controlling for all six of those variables. Bivariate correlations between total staffing and student achievement were significant at both the middle school and high school level when controlling for all school and community variables. Generally, the strength of the correlations between both certificated and total staffing tended to increase with grade level; at the high school level, correlations were among the strongest reported in any statewide study to date. There was a significant positive relationship between a majority of the 21 library services regularly provided and student achievement at all levels. Total library services were significantly related to student achievement at ...
Contributing Partner: UNT Libraries
Victorian Ideology and British Children's Literature 1830-1914

Victorian Ideology and British Children's Literature 1830-1914

Date: December 1984
Creator: Ackerman, Ann Trugman
Description: None
Contributing Partner: UNT Libraries
A Study to Determine the Relationship of Versatile Behavior to Individual Demographics, Job Characteristics, Organizational Climate Performance Feedback and Job Satisfaction

A Study to Determine the Relationship of Versatile Behavior to Individual Demographics, Job Characteristics, Organizational Climate Performance Feedback and Job Satisfaction

Date: May 1988
Creator: Ackerman, Raymond L. (Ramond Lorens)
Description: The behavioral characteristics of leaders have been subjects of study for centuries. The scope of these studies has grown to encompass task analysis, follower needs and situational requirements. Current leadership theories consistently recognize the need for a successful leader to adjust behavior to meet the needs of the task, followers and situation. The problem of this research is to define this ability to modify one's behavior, measure it and test its relationship to demographic and job characteristics. The purpose of this study is to evaluate the correlation of individuals" ability to modify their behavior to job function, hierarchy, climate, feedback, satisfaction and their demographic characteristics. The hypotheses held that high ability to modify behavior would correlate positively with job characteristics, climate, feedback and satisfaction and show no correlation to individual demographics. Data were collected through the administration of three research instruments to 138 managers of three business firms. The instruments were the Participant Data Form providing job and demographic characteristics, Descriptive Adjective Questionnaire measuring an individual ability to modify behavior, and Climate and Satisfaction Evaluation Index measuring climate, feedback and satisfaction. Perason's correlation coefficients were calculated to identify possible relationship between the manager's ability to modify behavior, called versatility, and ...
Contributing Partner: UNT Libraries
DNA-DNA Hybridization of Methane Oxidizing Bacteria

DNA-DNA Hybridization of Methane Oxidizing Bacteria

Date: December 1976
Creator: Ackerson, Jill W.
Description: Bacteria classified in the family Methylomonadaceae must derive their carbon from one-carbon compounds. They are characterized by the possession of internal membranes of two types. Type I membranes are layered and fill the middle of the cells while type II membranes form concentric layers around the periphery of the cells. Also, there are two metabolic pathways by which the methylobacteria assimilate one-carbon compounds. Further evidence of this dichotomy was sought by DNA-DNA saturation hybridization of DNAs from both types of methylobacteria. Very low DNA-DNA homology was seen between types I and II or within the types. It was not possible, therefore, to correlate the degree of genetic relatedness with either the nature of the internal membranes or the pathway of carbon assimilation.
Contributing Partner: UNT Libraries
Perceived Effect of the Quarter System on the Programs of Selected Middle Schools in the State of Texas

Perceived Effect of the Quarter System on the Programs of Selected Middle Schools in the State of Texas

Date: August 1977
Creator: Acuff, George D.
Description: None
Contributing Partner: UNT Libraries
The Value of Filmstrips in the Third Grade

The Value of Filmstrips in the Third Grade

Date: 1950
Creator: Adair, Elva Gaynelle
Description: The purpose of this study is to determine the possible influence of the use of filmstrip material upon a group of third-grade pupils as compared with another group of third-grade pupils not using filmstrip materials.
Contributing Partner: UNT Libraries
A Working Bibliography on the Art of Drawing

A Working Bibliography on the Art of Drawing

Date: August 1974
Creator: Adair, Rosalind Emily
Description: None
Contributing Partner: UNT Libraries
Vibrational Spectra and Potential Function of Tetrachlorocyclopropene

Vibrational Spectra and Potential Function of Tetrachlorocyclopropene

Date: August 1981
Creator: Adame, I. Ernesto
Description: None
Contributing Partner: UNT Libraries