UNT Libraries - Browse


An Exploration of the Word2vec Algorithm: Creating a Vector Representation of a Language Vocabulary that Encodes Meaning and Usage Patterns in the Vector Space Structure

Description: This thesis is an exloration and exposition of a highly efficient shallow neural network algorithm called word2vec, which was developed by T. Mikolov et al. in order to create vector representations of a language vocabulary such that information about the meaning and usage of the vocabulary words is encoded in the vector space structure. Chapter 1 introduces natural language processing, vector representations of language vocabularies, and the word2vec algorithm. Chapter 2 reviews the basic mathematical theory of deterministic convex optimization. Chapter 3 provides background on some concepts from computer science that are used in the word2vec algorithm: Huffman trees, neural networks, and binary cross-entropy. Chapter 4 provides a detailed discussion of the word2vec algorithm itself and includes a discussion of continuous bag of words, skip-gram, hierarchical softmax, and negative sampling. Finally, Chapter 5 explores some applications of vector representations: word categorization, analogy completion, and language translation assistance.
Date: May 2016
Creator: Le, Thu Anh

Exploration of Visual, Acoustic, and Physiological Modalities to Complement Linguistic Representations for Sentiment Analysis

Description: This research is concerned with the identification of sentiment in multimodal content. This is of particular interest given the increasing presence of subjective multimodal content on the web and other sources, which contains a rich and vast source of people's opinions, feelings, and experiences. Despite the need for tools that can identify opinions in the presence of diverse modalities, most of current methods for sentiment analysis are designed for textual data only, and few attempts have been made to address this problem. The dissertation investigates techniques for augmenting linguistic representations with acoustic, visual, and physiological features. The potential benefits of using these modalities include linguistic disambiguation, visual grounding, and the integration of information about people's internal states. The main goal of this work is to build computational resources and tools that allow sentiment analysis to be applied to multimodal data. This thesis makes three important contributions. First, it shows that modalities such as audio, video, and physiological data can be successfully used to improve existing linguistic representations for sentiment analysis. We present a method that integrates linguistic features with features extracted from these modalities. Features are derived from verbal statements, audiovisual recordings, thermal recordings, and physiological sensors signals. The resulting multimodal sentiment analysis system is shown to significantly outperform the use of language alone. Using this system, we were able to predict the sentiment expressed in video reviews and also the sentiment experienced by viewers while exposed to emotionally loaded content. Second, the thesis provides evidence of the portability of the developed strategies to other affect recognition problems. We provided support for this by studying the deception detection problem. Third, this thesis contributes several multimodal datasets that will enable further research in sentiment and deception detection.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2014
Creator: Pérez-Rosas, Verónica

An exploration study of the relationship between effectiveness of filial therapy training groups and group cohesion.

Description: This study examined the relationship of group cohesion among heterogeneous and homogeneous groups on individual treatment outcome of child-parent relationship therapy (CPRT). CPRT is a filial therapy model that targets the parent-child relationship as a means for preventing or improving child and/or family problems. This study included 30 parents or caregivers from 9 groups which met for 10 sessions. Participants qualified for this study if their groups ended with at least 3 group members and 2 leaders, all pretest and posttest data on their child between the ages of 2-11 was completed, and if they attended at least 6 of the 10 sessions. Correlation coefficients, t-tests, and effect sizes were calculated. Results demonstrated no statistically significant differences between pretests and posttests on the Child Behavior Checklist (CBCL) for all 30 participants; however, differences in measured effect (η2) between children identified with borderline and clinical behavior problems and children with normal behavior problems suggest that CPRT is more effective among children who demonstrate significant behavior problems. Perceived and observed group cohesion measurements demonstrated no significant difference at the individual outcome level. This finding suggests that group cohesion may not be related to individual outcome. Although there was no significant relationship between group cohesion and individual outcome for this study, results of the group measurements regarding engagement and group cohesiveness, coupled with previous studies on CPRT effectiveness, suggest that CPRT should be utilized in homogeneous groups.
Date: May 2009
Creator: Reed, Kelly Layne

Explorations with optically active, cage-annulated crown ethers.

Description: A variety of optically active macrocyclic crown ethers that serve as "host" systems that are capable of differentiating between enantiomeric "guest" molecules during host-guest complexation have been prepared via incorporation of chiral elements into the crown ring skeleton. The ability of these crown ethers to recognize the enantiomers of guest salts, i.e., (+) a-methyl benzylamine and to transport them enantioselectively in W-tube transport experiments were studied. The ability of these crown ethers to perform as chiral catalysts in an enantioselective Michael addition was studied. The extent of asymmetric induction, expressed in terms of the enantiomeric excess (%ee), was monitored by measuring the optical rotation of the product and comparing to the literature value.
Date: May 2003
Creator: Ji, Mingzhe

Explorations with Polycarbocyclic Cage Compounds

Description: A variety of novel cage-functionalized pyridyl containing crown ethers have been prepared for use in selective alkali metal complexation studies. A highly preorganized, cage-functionalized cryptand also has been designed and has been synthesized for use as a selective Li+ complexant. The alkali metal picrate extraction profiles of these cage-functionalized crown ethers also have been studied. Novel cage-functionalized diazacrown ethers have been prepared for selective alkali metal complexation studies. Alkali metal picrate extraction experiments have been performed by using this new class of synthetic ionophores to investigate the effects of cage-annulation and the influence of N-pivot lariat sidearms upon their resulting complexation properties. Novel pyridyl containing calix[4]arene receptors were prepared. Analysis of their respective 1H NMR and 13C NMR spectra suggests that calix[4]arene moieties in the ligand occupy the cone conformation. The complexation properties of these host molecules were estimated by performing a series of alkali metal picrate extraction experiments. An optically active cage-functionalized crown ether which contains a binaphthyl moiety as the chiral unit was prepared. The ability of the resulting optically active crown ether to distinguish between enantiomers of guest ammonium ions (i.e., phenylethylamonium and phenylglycinate salts) in transport experiments was investigated. Hexacyclo[,12.05,10.05,15.010,14]hexadeca-6,8-diene-4,11-dione was prepared from hexacyclo[,9.03,7.04,14.06,15] pentadeca-10,12-diene-2,8-dione. Unanticipated but remarkable acid and base promoted rearrangements of this new cage dione to novel polycyclic systems were observed and subsequently were investigated. The structures of the new systems thereby obtained were determined unequivocally by application of X-ray crystallographic methods. It is noteworthy that the reactions reported herein each provide the corresponding rearranged product in high yield in a single synthetic step. Pi-facial and regioselectivity in the thermal Diels-Alder cycloaddition between hexacyclo[,12.05,10.05,15.010,14]hexadeca-6,8-diene- 4,11-dione and ethyl propiolate have been explored. This reaction proceeds via stereospecific approach of the dienophile toward the syn face of the diene p -system. However, [4+2]cycloaddition proceeds with ...
Date: August 1999
Creator: Chong, Hyun-Soon

An Exploratory Analysis of Judicial Activism in the United States Supreme Court's Nullification of Congressional Statutes

Description: This study analyzes activist behavior of Supreme Court justices in 132 decisions which struck down congressional statutes as unconstitutional in 1789-1990. Analysis of the justices' activist rates and liberalism scores demonstrate that these votes are ideologically based. Integrated models containing personal attribute and case factor variables are constructed to explore the votes as activist behavior. The same models are also tested with a new dependent variable constructed to measure the nullification votes as liberal votes. The models which explain the votes as ideological responses better explain the votes than the models which explain the votes as activism or restraint. The attribute variables offer better explanation in the late 20th century models and the case factors offer better explanation in the early period models.
Date: August 1994
Creator: Keith, Linda Camp

Exploratory Analysis of Social E-health Behavior

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 exist for those who report engaging in social e-health behavior. This study is important because it underscores the fact that engagement in social e-health behavior is differentially distributed in the general U.S. population according to patterned sociodemographics.
Date: May 2014
Creator: Acadia, Spencer

An Exploratory Analysis of the Food Consumption Behavior of Up-scale Asian-American Consumers

Description: The first objective of this research was to identify whether Asian-Americans having higher than average levels of income and education represent an appropriate target market for four food product categories. Second, the impact of national origin membership, demographic variables, and level of acculturation on food consumption was determined. In addition, perceptions related to sensory and nutritional factors and the cultural acceptability of the products were identified and interpreted to determine if the variables differed among specific groups of Asian-American consumers.
Date: August 1993
Creator: Boykin, Nancy J. (Nancy Jo)

Exploratory and Confirmatory Factor Analysis of the Clinical Scales of the Luria-Nebraska Neuropsychological Test Battery, Form II

Description: The factor structure of the Luria Nebraska Neuropsychological Battery (LNNB) Form II was examined. A principle components factor analysis was performed on a sample of 102 psychiatric and neurologic subjects. It was necessary to remove 45 items from the analysis due to perfect performance by most subjects. The results were orthogonally rotated to simple structure using a Varimax method of rotation, and then compared to previous LNNB Form I and Form II results. Thirty-three factors were generated in the Exploratory Factor Analysis (EFA) . There was a very high agreement with the factors from Form I. Only one new factor was identified that didn't have a comparable Form I factor, and this factor appears to have neurological support. The similarity of the factor solutions between the two forms supports the continued use of factors derived from Form I for the interpretation of Form II, and supports the underlying structure presupposed by Lurian constructs. The present study also tested the significance of the hypothesized factor structures through confirmatory factor analysis (CFA). No hypothesis about the underlying factor structure based on previous exploratory studies was supported. The CFA did suggest that the best factor solution to the LNNB Form II is one that (a) has correlated factors and (b) has items loading on more than one factor. The confirmatory results were interpreted as not supporting the current exploratory results, or the previous factor analytic results. Problems notwithstanding, researchers may be better directed to propose factor models for the LNNB that have correlated factors, and to work samples approaching the 10 to 1 recommended sample size for multivariate analysis. One conclusion that was drawn from the concurrence between the two Form II studies pertains to psychiatric populations used in both studies. It was necessary to exclude a large number of items in each ...
Date: May 1990
Creator: Nagel, Jeffrey A.

An Exploratory Empirical Investigation of Information Processing among Incubator-Housed Manufacturers during Channel Member Selection

Description: The purpose of this research was to conduct an exploratory study of the information processing utilized by incubator-housed manufacturers during channel member selection. The study included the evaluation of the decision models used by the manufacturers as well as criteria used in the selection process. The study was specifically designed to achieve the following objectives. First, the research was to identify the evaluation modes used by the manufacturers as either compensatory or noncompensatory. Second, the study was to evaluate the effect of the task on the selection of the evaluation model(s) used during the channel member selection process. Third, the study was to evaluate the effect of the selected decision strategy on the amount of information used during the decision process. Finally, the study was to identify and examine the importance of the criteria used by the manufacturers in the selection process. The methodology in this study consisted of primary research using protocol analysis as the main data gathering technique. A ranking instrument was also mailed to the respondents prior to the protocol session. The population for the study was identified as all manufacturers located in publicly-sponsored business incubators. A total of 235 incubators were in existence with approximately 47 percent of them being publicly-sponsored. Approximately 42 percent of the incubators house at least one manufacturing firm. It was estimated that there were approximately 46 manufacturing firms located in public incubators. A sample of six was used in this study. The statistical analysis included frequencies, cross tabulations, correlations, paired comparisons, and measures of association. The findings of this study suggest that the incubator-housed manufacturers' choice of evaluation models was not affected by the task nor did the selected strategy influence the amount of information used by the manufacturers. The findings indicate a need for further research to evaluate the relationships ...
Date: December 1988
Creator: Fontenot, Gwen F.

Exploratory Factor Analysis of the Geriatric Depression Scale Among Cardiac Patients

Description: The Geriatric Depression Scale (GDS) was originally designed as a measure for screening depression among elderly medical patients. Although this instrument is well validated among a general medical population, it has never been evaluated with specific regard to cardiac patients, the largest single group of medical patients over 40 years of age. A general cardiac sample of 655 patients completed the GDS within 10 weeks of the cardiac event. Exploratory factor analyses were conducted on the main sample, then on several subgroups of participants with regard to diagnostic category, gender, and age. The GDS generally produces factor structures with several symptom domains with a high rate of total variance. The myocardial infarction group endorsed general symptoms of depression whereas the coronary artery bypass graft group reported greater levels of despair regarding their condition. Overall, males primarily reported agitation and hopelessness while females reported symptoms of depressed mood.
Date: May 1998
Creator: Hupp, Gregory S.

An Exploratory Field Study of Adolescent Consumer Behavior: The Family Purchasing Agent

Description: An exploratory field study was conducted to examine internal and external factors that influence adolescents' consumer behavior when serving as the family purchasing agents. Demographic, lifestyle, and marketing activities were examined to determine the influences that affect whether the adolescent will purchase the preferred family brands or other brands. Participating adolescents were sent by their parents to the grocery store on two separate occasions to purchase four preselected grocery items. The brands purchased were recorded and compared to the preferred brand names provided by the parents. While no statistical significance was found, occasional trends were observed. The analysis indicated that adolescents who experience a pluralistic family communication style will purchase products other than the preferred household brands. Adolescents who are exposed to television and radio tend to deviate more from the preferred family brands more often than do adolescents with less media exposure. Adolescents who work are more likely to go to the grocery store more often for their families than do nonworking adolescents. Also, adolescents seem to possess a price sensitivity to both high and low-involvement grocery items.
Date: August 1989
Creator: Hardy, Jane P.

An Exploratory Investigation of Marital Role Expectations and their Relationships to Perceived Parent-Child Relations and Perceived Family Integration

Description: Fifty-one male and 57 female college undergraduate students enrolled in an introductory psychology course responded to the Roe-Siegelman PCR Questionnaire, a modified form of Tharp's (1963b) Marital Role Expectation Form (MRE), and a Family Integration Scale as fulfillment of research participation requirements. Previous research had indicated that generally children who experienced love and warmth in their childhood home had marital role expectations of friendliness, spontaneity, adaptability, trust, responsibility, and leadership, while those who experienced rejecting and neglecting parental behaviors were more likely to have expectations of being seclusive, guilty, hostile, rigid, mistrustful, and irresponsible.
Date: May 1973
Creator: Hopewell, Clifford Alan

An Exploratory Investigation of Socio-Economic Phenomena that May Influence Accounting Differences in Three Diverse Countries

Description: This dissertation attempts to provide an exploratory structure to respond to, and tries to resolve, an existing void in international accounting research. The void is a lack of coherently structured, nation-specific, descriptive research to investigate socio-economic phenomena which may influence financial accounting. This dissertation's salient features include a political economy theory, an exploratory, sociological method, and a case study format. The political economy of accounting, introduced by Tinker [1980] and refined by Cooper and Sherer [1984], emphasizes a persuasive social relations dimension. This theory motivates selection of three countries (the United States, France, and Japan) that appear to have divergent socio-cultural environments. An exploratory and analytical approach of modified (enlarged) exogenism, developed by Smith [1973, 1976] and adapted to accounting by McKinnon [1986], provides an analytic structure for this exploratory investigation. Modified exogenism focuses upon an open, dynamic social system (the process of financial accounting), and provides analysis reflecting four major areas (the environment, intrusive events, intra-system activity, and trans-system activity). After examining the nation-specific financial accounting (socio-economic) structures for each country, an analysis of selected financial disclosures attempts to gain a better understanding of how socio-economic factors have influenced the development of financial accounting. My primary objective is to attempt to provide some insight about ,how diverse socio-political factors have impacted the development of financial accounting in three countries. Library research of nation-specific literature attempts to extract a relatively accurate picture of social, political, and economic institutions and policies, and relates such findings to financial accounting processes for each nation. This dissertation attempts to provide a necessary foundation for future theoretical international accounting harmonization studies.
Date: August 1989
Creator: Hudack, Lawrence R. (Lawrence Ralph)

An exploratory investigation of the effects of co-production and co-consumption on the characteristics and adoption of service innovations: the customer's perspective.

Description: Customers play an active role throughout the marketing process. This dissertation concerns itself with customer's co-creation of value for self (co-production) and for other customers (co-consumption) during service production and delivery. With the servuction system as its overarching framework, this study explains how changes in the customer's perceived co-production and co-consumption, caused by a service innovation, influence her perceptions of service innovation characteristics and modify her adoption behavior. It draws on a multidisciplinary body of knowledge and develops a conceptual framework and a set of substantive propositions. The empirical research was contextualized in three services: self check-out at grocery stores, Build-A-Bear stores, and meal assembly centers. It focused on members of Generations X and Y who were familiar with these services. The qualitative investigations and pilot study helped adapt the extant scales and construct new scales. In line with prior works, the focal service encounters were simulated through a series of consumption scenarios. The exploratory factor analysis in the pilot study and the confirmatory factor analysis in the main study indicated that the instruments were culturally informed, internally reliable, and construct-wise valid. The results indicate that co-production and co-consumption play important roles in explaining innovation characteristics and adoption decisions. More specifically, the focal customer's co-production of the service for self (CPS), other customers' co-production of the service for the focal customer (OCP), the number and the nature of other customers (crowding and homophily) can help to explain the focal customer's evaluation of service innovation characteristics as well as her adoption decision. The focal customer's disposition to participate (DTP) and its interaction with CPS are also useful explanatory constructs. Focal customer's co-production of the service for other customers (CPO) and its interaction with DTP emerged as non-significant. In comparing the high- and low-DTP groups, it was found that the former was ...
Date: August 2007
Creator: Zolfagharian, Mohammadali

An Exploratory Investigation of the Origins and Regulatory Actions of the United Kingdom's Financial Reporting Review Panel

Description: In 1990, the accounting profession and the British government worked together to establish a new regulatory framework for financial reporting in the United Kingdom (UK), the Financial Reporting Council (FRC) and its two subsidiaries, the Accounting Standards Board (ASB) and the Financial Reporting Review Panel (FRRP). The FRRP enforces companies' compliance with the ASB's accounting standards and the accounting provisions of the UK Companies Act. Only one study, Brandt et al. (1997), has examined the activities and effectiveness of the FRRP. This dissertation attempts to extend Brandt et. al (1997) and add to understanding of the origins and regulatory actions of the FRRP.
Date: December 1998
Creator: Styles, Alan K. (Alan Keith)

An Exploratory Study of a Self-Rating, Sentence Completion Method for Evaluating Marital Difficulties

Description: The purpose of this study is to explore a possible method of diagnosing marital difficulties. This is an exploratory investigation into the possibility of developing a particular method for marital diagnosis rather than a specific test for such a diagnosis. This method consists of a series of related sentence stems which the subject completes and then rates as to their degree of difficulty.
Date: August 1969
Creator: Walker, Martha Jane

Exploratory Study of Animal Assisted Therapy Interventions Used by Mental Health Professionals

Description: The purpose of this study was to explore the various animal assisted interventions mental health professionals incorporate in the therapeutic treatment process, as well as the various therapeutic purposes intended with each technique. Participants were recruited from animal assisted therapy related databases. Participants included professionals who practiced in the mental health field. Thirty one participants qualified for the study. A survey was developed based on information found reviewing literature related to animal assisted therapy. Nineteen animal assisted therapy techniques and ten therapeutic intentions were identified from a review of the literature. Participants were asked to rate on a Likert scale how often they incorporated each technique in their treatment process. Additionally, participants were asked to identify which therapeutic purposes they intended with each technique. Results indicated participants incorporated a variety of animal assisted techniques for various therapeutic intentions. Results indicated seven animal assisted techniques were incorporated by more than 50% of the participants. Building rapport in the therapeutic relationship was the most common therapeutic intention reported with a variety of animal assisted techniques.
Date: May 2008
Creator: O'Callaghan, Dana M.

An Exploratory Study of Factors Influencing the Effectiveness of the Amob/vll Program for Participants in North Central Texas

Description: This study assessed falls efficacy and confidence-related changes among participants attending the a Matters of Balance/Volunteer Lay Leader (AMOB/VLL) falls prevention program for older adults, based on their residential location. Data were examined from 431 older Texans enrolled in AMOB/VLL during a two-year period, and assessed at baseline and post-intervention. Results indicate that participants significantly increased falls efficacy, reduced activity interference due to their health, and decreased the number of days limited from usual activity. Regression models show that participants, despite entering the program with lower reported health status, reported greater rates of positive change for falls efficacy and health interference compared with their baseline pre-intervention counterparts. Overall program attendance and attendance at major sessions showed the greatest influence. Findings contribute to the understanding of cognitive restructuring and strengthening variations with falls prevention program outcomes.
Date: December 2011
Creator: Ewing, Charles W.