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2,963 Matching Results
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Charge Collection Studies on Integrated Circuit Test Structures using Heavy-Ion Microbeams and MEDICI Simulation Calculations
Ion induced charge collection dynamics within Integrated Circuits (ICs) is important due to the presence of ionizing radiation in the IC environment. As the charge signals defining data states are reduced by voltage and area scaling, the semiconductor device will naturally have a higher susceptibility to ionizing radiation induced effects. The ionizing radiation can lead to the undesired generation and migration of charge within an IC. This can alter, for example, the memory state of a bit, and thereby produce what is called a "soft" error, or Single Event Upset (SEU). Therefore, the response of ICs to natural radiation is of great concern for the reliability of future devices. Immunity to soft errors is listed as a requirement in the 1997 National Technology Roadmap for Semiconductors prepared by the Semiconductor Industry Association in the United States. To design more robust devices, it is essential to create and test accurate models of induced charge collection and transport in semiconductor devices. A heavy ion microbeam produced by an accelerator is an ideal tool to study charge collection processes in ICs and to locate the weak nodes and structures for improvement through hardening design. In this dissertation, the Ion Beam Induced Charge Collection …
Date:
May 2000
Creator:
Guo, Baonian
System:
The UNT Digital Library
An Analysis of the Composition Process of Bartók's Eight Improvisations on Hungarian Peasant Songs, Op. 20
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This is a study of Bartók's compositional process as it relates to the Improvisations, Op. 20. The study, which focuses on the analysis of the draft manuscript 50PS1, compares the draft and other relevant sources with the final composition. Bartók's framework for the entire Improvisations is based on a compositional strategy of pairing individual improvisations combined with systematic revision of the draft copy by the introduction of tritones as tonal equivalents and movement by fifths from semitones, to achieve structural coherence in the individual improvisations. The tonic-dominant relationship is used to rearrange the individual improvisations in the draft and tritones as tonal equivalents are used to propel the movement between the improvisations to produce a coherent whole.
Date:
May 2000
Creator:
Kochbeck, Olivia M.
System:
The UNT Digital Library
Empirical Evidence of Pricing Efficiency in Niche Markets
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Unique and proprietary data of the illiquid, one-year non cancelable for three month Bermudan swaps (1Y NC 3M swaps) and one-year non callable for three months Bermudan CDs (1Y NC 3M CDs), provides evidence of market efficiency. The 1Y NC 3M swap and 1Y NC 3M CD markets efficiently reflected unexpected economic information. The 1Y NC 3M swaption premiums also followed the European one-year into three-month (1Y into 3M) swaption volatilities. Swaption premiums were computed by pricing non-optional instruments using the quoted 1Y NC 3M swap rates and the par value swap rates and taking the difference between them. Swaption premiums ranged from a slight negative premium to a 0.21 percent premium. The average swaption premium during the study period was 0.02 percent to 0.04 percent. The initial swaption premiums were over 0.20 percent while the final swaption premiums were 0.02 percent to 0.04 percent. Premiums peaked and waned throughout the study period depending on market uncertainty as reflected in major national economic announcements, Federal Reserve testimonies and foreign currency devaluations. Negative swaption premiums were not necessarily irrational or quoting errors. Frequently, traders obligated to provide market quotes to customers do not have an interest and relay that lack of …
Date:
May 2000
Creator:
Koch, Sandra Idelle
System:
The UNT Digital Library
Young-Jo Lee's Variations on the theme of Baugogae: In search of his own language, a lecture recital, together with three recitals of selected works of J. Haydn, S. Rachmaninoff, R. Schumann, O. Messiaen, and F. Liszt
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The objective of the dissertation is to examine Young-Jo Lee's (b. 1943) musical language as exhibited in his piano composition, Variations on the theme of Baugogae. Subjects of discussion include Lee's use of direct and indirect musical borrowings from past European composers and traditional Korean folk idioms. Also included are a biographical sketch of the composer and historical overview of modern Korean composers. This dissertation investigates Lee's effort to synthesize traditional Korean music and Western music in one art form and ultimately, to create his own musical language.
Date:
May 2000
Creator:
Kwon, Suk-Rahn
System:
The UNT Digital Library
Effects of Implementing a Competency-Based Performance Management System on Measures of Sales Performance
Use of competency models has exploded in recent years. Unfortunately, the empirical research to validate such systems is scarce. This study explores the relationship between Competency-based Performance Management Systems and sales performance to determine whether the use of these systems increases performance. Performance data from sales representatives in a medical products company were examined to determine changes in performance following the introduction of the Competency-based Performance Management System (N=64). Correlations with performance were obtained for each competency dimension to determine if any factors were highly correlated with performance and if state-factors were more positively correlated with performance than trait-factors (N=66). The study found no significant relationship between implementation of a Competency-based Performance Management System and sales performance. Also state-factors were not more positively correlated with sales performance than trait-factors.
Date:
May 2000
Creator:
Lynch, Ronald
System:
The UNT Digital Library
Utilization of the family medical leave act: A case study
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American businesses have confronted a changing world economy marked by increasing competition , technological innovation, and instability. Many more women have entered the labor force. Many families' caregiving needs are now being met by family members who also are holding down jobs. This, in turn, has fueled the rising need among employees for workplace policies that enable them to meet the often competing demands of job and home. In 1993, Congress passed the Family and Medical Leave Act (FMLA of the Act) to provide a national policy that supports families in their efforts to strike a workable balance between the competing demands of the workplace and the home. The objective of this study is to examine the amount of FMLA lost time at one particular company in order to determine a demographic and job characteristic profile of employees who take time away from their jobs for reasons that are protected by the Act.
Date:
May 2000
Creator:
Mahdi, Taalib-Din N.
System:
The UNT Digital Library
Creating a Criterion-Based Information Agent Through Data Mining for Automated Identification of Scholarly Research on the World Wide Web
This dissertation creates an information agent that correctly identifies Web pages containing scholarly research approximately 96% of the time. It does this by analyzing the Web page with a set of criteria, and then uses a classification tree to arrive at a decision. The criteria were gathered from the literature on selecting print and electronic materials for academic libraries. A Delphi study was done with an international panel of librarians to expand and refine the criteria until a list of 41 operationalizable criteria was agreed upon. A Perl program was then designed to analyze a Web page and determine a numerical value for each criterion. A large collection of Web pages was gathered comprising 5,000 pages that contain the full work of scholarly research and 5,000 random pages, representative of user searches, which do not contain scholarly research. Datasets were built by running the Perl program on these Web pages. The datasets were split into model building and testing sets. Data mining was then used to create different classification models. Four techniques were used: logistic regression, nonparametric discriminant analysis, classification trees, and neural networks. The models were created with the model datasets and then tested against the test dataset. Precision …
Date:
May 2000
Creator:
Nicholson, Scott
System:
The UNT Digital Library
The Reformation-Era Church Courts of England: A Study of the Acta of the Archidiaconal and Consistory Court at Chester, 1540-1542
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Much work has been done over the last fifty years in the study of the English ecclesiastical courts. One court that thus far has escaped much significant scholarly attention, however, is the one located in Chester, England. The author analyzes the acta of that court in order to determine what types of cases were being heard during the years 1540-42. His analysis shows that the Chester court did not deviate significantly from the general legal and theological structure and function of Tudor church courts of the period.
Date:
May 2000
Creator:
Mitchener, Donald Keith
System:
The UNT Digital Library
The United States Supreme Court's Volitional Agendas, 1801-1993: Historical Claims versus Empirical Findings
In this study, I examined the Supreme Court's agenda from 1801 to 1993 to determine the composition and dynamics of the issues that have dominated the business of the Court. Specifically, I set out to test empirically Robert G. McCloskey's (now standard) characterization of the Supreme Court's history, which sees it as dominated by nationalism/federalism issues before the Civil War, by economic issues just after the War through the 1930s, and by civil rights and liberties since the 1930s. The question that drove my investigation was "Is McCloskey's interpretation, which appears to be based on the great cases of Supreme Court history, an accurate description of the agenda represented in the Supreme Court's total body of reported decisions?" To test McCloskey's historical theses I employed concepts adapted from Richard Pacelle's (1991) important work on the agenda of post-Roosevelt Court and used the methods of classical historical analysis and of interrupted time-series analysis. Data for my research came from existing datasets and from my own collection (I coded the manifest content of thousands of Supreme Court's decisions from 1887 back to 1801). The most important finding from my analyses is that McCloskey not withstanding, the pre-Civil War Supreme Court's agenda was …
Date:
May 2000
Creator:
Ogundele, Ayodeji O.
System:
The UNT Digital Library
Identifying At-Risk Students: An Assessment Instrument for Distributed Learning Courses in Higher Education
The current period of rapid technological change, particularly in the area of mediated communication, has combined with new philosophies of education and market forces to bring upheaval to the realm of higher education. Technical capabilities exceed our knowledge of whether expenditures on hardware and software lead to corresponding gains in student learning. Educators do not yet possess sophisticated assessments of what we may be gaining or losing as we widen the scope of distributed learning. The purpose of this study was not to draw sweeping conclusions with respect to the costs or benefits of technology in education. The researcher focused on a single issue involved in educational quality: assessing the ability of a student to complete a course. Previous research in this area indicates that attrition rates are often higher in distributed learning environments. Educators and students may benefit from a reliable instrument to identify those students who may encounter difficulty in these learning situations. This study is aligned with research focused on the individual engaged in seeking information, assisted or hindered by the capabilities of the computer information systems that create and provide access to information. Specifically, the study focused on the indicators of completion for students enrolled in …
Date:
May 2000
Creator:
Osborn, Viola
System:
The UNT Digital Library
A Study of Graphically Chosen Features for Representation of TREC Topic-Document Sets
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Document representation is important for computer-based text processing. Good document representations must include at least the most salient concepts of the document. Documents exist in a multidimensional space that difficult the identification of what concepts to include. A current problem is to measure the effectiveness of the different strategies that have been proposed to accomplish this task. As a contribution towards this goal, this dissertation studied the visual inter-document relationship in a dimensionally reduced space. The same treatment was done on full text and on three document representations. Two of the representations were based on the assumption that the salient features in a document set follow the chi-distribution in the whole document set. The third document representation identified features through a novel method. A Coefficient of Variability was calculated by normalizing the Cartesian distance of the discriminating value in the relevant and the non-relevant document subsets. Also, the local dictionary method was used. Cosine similarity values measured the inter-document distance in the information space and formed a matrix to serve as input to the Multi-Dimensional Scale (MDS) procedure. A Precision-Recall procedure was averaged across all treatments to statistically compare them. Treatments were not found to be statistically the same and …
Date:
May 2000
Creator:
Oyarce, Guillermo Alfredo
System:
The UNT Digital Library
Sorry Guard
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Sorry Guard is a collection of poems with a critical introduction on poetic form. Form in poetry can be revealed vocally (how the poem sounds), temporally (how the poem makes use of time), and spatially (how the poem is visualized, both physically on the page due to typography and imagistically due to the shape and movement of its subject matter). In this preface, I will address these three aspects of form in relation to three distinct twentieth century poets: Robert Hass, W.S. Merwin, and W.H. Auden. I am most interested in how particular formal decisions shape meaning and value in poetry. My aesthetic approach here primarily dwells on what Helen Vendler calls, "the music of what happens." The urgency of Robert Hass's spoken word is important to me because I wish to make poems that should be spoken aloud and remembered. While W.S. Merwin's rejection of punctuation is not my own aesthetic outlook, I strive to achieve through close attention to temporal form the mythic voice of his poemsthe immediacy of his lines and images, especially in his second four books. And Auden's deft use of spatial form is only a small aspect of his remarkable verse. All three poets …
Date:
May 2000
Creator:
Poch, John
System:
The UNT Digital Library
Exogenous Influences and Paths To Activism
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The focus of this research was to ascertain the indirect effects upon activism of intervening variables and recognized exogenous influences upon activism. In addition, this research also focused upon the differences and similarities of a recruited activist model and spontaneous activist model. Regression and path analysis were used to measure the direct and indirect effects of the exogenous and intervening variables. This research found that when the intervening variables, political interest, political awareness, exposure to media, altruism, and self-interest were introduced to both the recruited and spontaneous models, the direct effects of the variables were enhanced.
Date:
May 2000
Creator:
Ray, Grady Dale
System:
The UNT Digital Library
An Online Academic Support Model for Students Enrolled in Internet-Based Classes
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This doctoral dissertation describes a research study that examined the effectiveness of an experimental Supplemental Instruction (SI) program that utilized computer-mediated communication (CMC) rather than traditional SI review sessions. During the Spring 1999 semester, six sections of an introductory computer course were offered via the Internet by a suburban community college district in Texas. Using Campbell and Stanley's Nonequivalent Control Group model, the online SI program was randomly assigned to four of the course sections with the two remaining sections serving as the control group. The students hired to lead the online review sessions participated in the traditional SI training programs at their colleges, and received training conducted by the researcher related to their roles as online discussion moderators. Following recommendations from Congos and Schoeps, the internal validity of the groups was confirmed by conducting independent t-tests comparing the students' cumulative credit hours, grade point averages, college entrance test scores, and first exam scores. The study's four null hypotheses were tested using multiple linear regression equations with alpha levels set at .01. Results indicated that the SI participants earned better course grades even though they had acquired fewer academic credits and had, on average, scored lower on their first course …
Date:
May 2000
Creator:
Rockefeller, Debra J.
System:
The UNT Digital Library
Work-family responsiveness in organizations: The influence of resource dependence and institutionalization on program adaptation
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Changes in workforce demographics, employee sentiments, and working conditions have increased attention on employees' needs to balance the demands of work life and family life. Despite apparent growing interest among companies to be responsive to these needs, the number of companies demonstrating high levels of work-family responsiveness is relatively small. The frameworks of resource dependence theory and institutional theory were used to develop a model to explain differences in work-family responsiveness among for-profit companies. The theoretical models were tested on survey data collected through a stratified random sample of 692 for-profit companies. The data were further enhanced with secondary data sources. While the institutional model explained more variance in work-family responsiveness than the resource dependence model, a model combining both theories best explains work-family responsiveness among for-profit companies. High industry-region diffusion of family-friendly benefits was one of several strong predictors of work-family responsiveness. Also, the greater the proportion of professionals in a company's industry, the greater was the level of work-family responsiveness. Companies that measured effectiveness outcomes were more likely to offer family-friendly benefits. The same was true for companies with more positive assessments regarding the impact of their family-friendly benefits. Organizations that were large, publicly traded, or had human …
Date:
May 2000
Creator:
Ruggiere, Paul
System:
The UNT Digital Library
Virginia Carter Smith: Her Career and Contributions to Advancement in Higher Education
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Most research studies of women in the college and university advancement profession measure the number of women in advancement positions, report their corresponding salaries and reflect on the differences between male and female employees in the same position. Little research explores how women achieve high ranking advancement positions and very few provide an analysis of the characteristics, influences and careers of successful female advancement professionals. This dissertation describes the life and work of Virginia Carter Smith, founding editor of the Council for Advancement and Support of Education's award winning publication CURRENTS. The career and contributions of Virginia Carter Smith are relevant and helpful to advancement professionals in colleges, universities and K-12 institutions. This study explores Smith's formative years as a child, describes her educational and extra-curricular preparation and identifies individuals who influenced her life and provided direction for her future. It also examines Smith's role in the formation and direction of CASE and CURRENTS. Smith successfully launched CURRENTS in 1975 when few women held senior-level positions in advancement-related fields. With Smith's contributions, CASE became the dominate professional organization for advancement professionals working in educational institutions, and CURRENTS continues to be an exemplary professional development periodical for individuals working in advancement. …
Date:
May 2000
Creator:
Russell, Kimberly A.
System:
The UNT Digital Library
Macroinvertebrate Community Structure as an Indicator of Watershed Health in the Upper Trinity River Basin, North Central Texas
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This study describes macroinvertebrate community structure and assesses its potential in detecting point and non-point sources of disturbance associated with rural and urban areas in the Upper Trinity River Basin. Geospatial techniques were used to quantify landuse within the watershed in a GIS. At rural sites near the headwaters of the Trinity River, collector-gathering burrowers that are adapted to minimal flow comprised the majority of taxa. Destinies of taxa compositions at downstream sites increased and shifted toward psammophilic and rheophilic invertebrates, including primarily collector-filtering clingers, that are characteristic of shifting sand habitats in large prairie rivers. Benthic community structure generally benefited from point source impacts including wastewater treatment plant effluents that maintained higher flow. Community indices were negatively associated with forest landuse and positively associated with urban landuse. Partial CCA determined that flow and landuse contributed equally to species dispersions. Comparisons with historical biomonitoring studies in upper Trinity River Basin indicate improved watershed health.
Date:
May 2000
Creator:
Stephenson, Jaynie M.
System:
The UNT Digital Library
Scanning Tunneling Microscopy of Homo-Epitaxial Chemical Vapor Deposited Diamond (100) Films
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Atomic resolution images of hot-tungsten filament chemical-vapor-deposition (CVD) grown epitaxial diamond (100) films obtained in ultrahigh vacuum (UHV) with a scanning tunneling microscope (STM) are reported. A (2x1) dimer surface reconstruction and amorphous atomic regions were observed on the hydrogen terminated (100) surface. The (2x1) unit cell was measured to be 0.51"0.01 x 0.25"0.01 nm2. The amorphous regions were identified as amorphous carbon. After CVD growth, the surface of the epitaxial films was amorphous at the atomic scale. After 2 minutes of exposure to atomic hydrogen at 30 Torr and the sample temperature at 500° C, the surface was observed to consist of amorphous regions and (2x1) dimer reconstructed regions. After 5 minutes of exposure to atomic hydrogen, the surface was observed to consist mostly of (2x1) dimer reconstructed regions. These observations support a recent model for CVD diamond growth that is based on an amorphous carbon layer that is etched or converted to diamond by atomic hydrogen. With further exposure to atomic hydrogen at 500° C, etch pits were observed in the shape of inverted pyramids with {111} oriented sides. The temperature dependence of atomic hydrogen etching of the diamond (100) surface was also investigated using UHV STM, and …
Date:
May 2000
Creator:
Stallcup, Richard E.
System:
The UNT Digital Library
The Cluster Hypothesis: A Visual/Statistical Analysis
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By allowing judgments based on a small number of exemplar documents to be applied to a larger number of unexamined documents, clustered presentation of search results represents an intuitively attractive possibility for reducing the cognitive resource demands on human users of information retrieval systems. However, clustered presentation of search results is sensible only to the extent that naturally occurring similarity relationships among documents correspond to topically coherent clusters. The Cluster Hypothesis posits just such a systematic relationship between document similarity and topical relevance. To date, experimental validation of the Cluster Hypothesis has proved problematic, with collection-specific results both supporting and failing to support this fundamental theoretical postulate. The present study consists of two computational information visualization experiments, representing a two-tiered test of the Cluster Hypothesis under adverse conditions. Both experiments rely on multidimensionally scaled representations of interdocument similarity matrices. Experiment 1 is a term-reduction condition, in which descriptive titles are extracted from Associated Press news stories drawn from the TREC information retrieval test collection. The clustering behavior of these titles is compared to the behavior of the corresponding full text via statistical analysis of the visual characteristics of a two-dimensional similarity map. Experiment 2 is a dimensionality reduction condition, in …
Date:
May 2000
Creator:
Sullivan, Terry
System:
The UNT Digital Library
Violence Prevention: Evaluation of an Adapted Curriculum
The Prothrow-Stith violence prevention curriculum for high school students was adapted and presented to middle school students. An adaptation in materials, reading level and administration should not adversely effect the outcome of program participation, as the concepts that form the foundation of this curriculum are applicable to all ages. The essential question addressed in this study is as follows: Is the adapted curriculum effective? The evaluation instrument used for both pretests and posttest showed three distinct sections that were composed of general knowledge statements; statements that indicated an attitudinal predisposition toward violence; and statements that indicated a behavioral predisposition toward violence. After factor analysis the general knowledge section showed three grouping factors: factual knowledge, murder knowledge and alcohol knowledge. Factor analysis of the attitude section yielded two factors: a positive attitudinal predisposition toward violence and a negative predisposition toward violence. Seven hypotheses were tested. The analysis showed in a significant difference between the pretest and posttest for all respondents as an increase in factual knowledge; a decrease in negative attitude predisposition toward violence; and, a decrease in behavioral predisposition toward violence. There was a significant difference between the participating schools; there was no significant difference between the ages; and, results …
Date:
May 2000
Creator:
Walker, Sharon Lee
System:
The UNT Digital Library
Calling Up the Dead
Calling Up the Dead is a collection of seven short stories which all take place over the final hours of December 31, 1999 and the first few hours of January 1, 2000. The themes of time, history, and the reactions toward the new millennium (positive, negative, indifferent) of a variety of cultures are addressed. Each of the six major continents has a story, along with its cultural perspective, delivered by narrators both young and old, three female, three male and one balcony.
Date:
May 2000
Creator:
Weaver, Brett
System:
The UNT Digital Library
The Validity of Health Claims on the World Wide Web: A Case Study of the Herbal Remedy Opuntia
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The World Wide Web has become a significant source of medical information for the public, but there is concern that much of the information is inaccurate, misleading, and unsupported by scientific evidence. This study analyzes the validity of health claims on the World Wide Web for the herbal Opuntia using an evidence-based approach, and supports the observation that individuals must critically assess health information in this relatively new medium of communication. A systematic search by means of nine search engines and online resources of Web sites relating to herbal remedies was conducted and specific sites providing information on the cactus herbal remedy from the genus Opuntia were retrieved. Validity of therapeutic health claims on the Web sites was checked by comparison with reports in the scientific literature subjected to two established quality assessment rating instruments. 184 Web sites from a variety of sources were retrieved and evaluated, and 98 distinct health claims were identified. 53 scientific reports were retrieved to validate claims. 25 involved human subjects, and 28 involved animal or laboratory models. Only 33 (34%) of the claims were addressed in the scientific literature. For 3% of the claims, evidence from the scientific reports was conflicting or contradictory. Of …
Date:
May 2000
Creator:
Veronin, Michael A.
System:
The UNT Digital Library
Conformational Studies of Myosin and Actin with Calibrated Resonance Energy Transfer
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Resonance energy transfer was employed to study the conformational changes of actomyosin during ATP hydrolysis. To calibrate the technique, the parameters for resonance energy transfer were defined. With conformational searching algorithms to predict probe orientation, the distances measured by resonance energy transfer are highly consistent with the atomic models, which verified the accuracy and feasibility of resonance energy transfer for structural studies of proteins and oligonucleotides. To study intramyosin distances, resonance energy transfer probes were attached to skeletal myosin's nucleotide site, subfragment-2, and regulatory light chain to examine nucleotide analog-induced structural transitions. The distances between the three positions were measured in the presence of different nucleotide analogs. No distance change was considered to be statistically significant. The measured distance between the regulatory light chain and nucleotide site was consistent with either the atomic model of skeletal myosin subfragment-1 or an average of the three models claimed for different ATP hydrolysis states, which suggested that the neck region was flexible in solution. To examine the participation of actin in the powerstroke process, resonance energy transfer between different sites on actin and myosin was measured in the presence of nucleotide analogs. The efficiencies of energy transfer between myosin catalytic domain and actin …
Date:
May 2000
Creator:
Xu, Jin
System:
The UNT Digital Library
The Developmental Stages of Concern of Teachers Toward the Implementation of the Information Technology Curriculum in Kuwait
Change is best carried out by individual teachers, and, thus, identifying and resolving teachers concerns about an innovation is imperative in guiding the change process to a successful point of implementation. The purpose of this study was to identify concerns that teachers experienced when implementing the Information Technology curriculum in all intermediate schools in Kuwait and to examine the relationships among teachers reported stages of concern and other factors, such as gender and experience. The stages of concern, one dimension of the Concerns-Based Adoption Model (CBAM), was applied to reveal teachers concerns. The Stages of Concern Questionnaire (SoCQ) and a demographic survey were completed by 248 respondents. The SoCQ measures seven stages of concern that reflect three dimensions: self (awareness, informational, and personal); task (management); and impact (consequence, collaboration, and refocusing Group profile analysis revealed that teachers had four high concerns related to collaboration, personal, refocusing, and informational stages. Teachers also reported low concerns at the management and awareness stages. Both females and males reported collaboration as their greater concern. Teachers with more years of experience reported higher impact concerns. The analysis of individuals peak concerns revealed that the majority of the respondents were adopters of the innovation. The analysis …
Date:
August 2000
Creator:
Alshammari, Bandar S.
System:
The UNT Digital Library