Call number: LD2668 .T4 1956 L54 / Master of Science

Call number: LD2668 .T4 1963 R47 / Master of Science

Performance monitoring in communication networks, which isthe main topic of this thesis, is an essential part ofperformance and network management. The applications cover anumber of different areas such as daily operations andmaintenance, usage information for billing purposes, customerreports, traffic control, planning, and dimensioning. The main purpose of the thesis is to develop a single methodfor measurement of the most significant network performanceparameters in IP networks. It is a continuation from a previouslicentiate thesis that focused on performance monitoring incell-based networks. The development of a measurement method that combines activeand passive approaches using monitoring blocks is the maincontribution of this work. A traffic flow performance meterbased on these principles has been implemented as an extensionto the open source flow meter NeTraMet and tested. Theresolution and precision of the results are determined by thesize of the monitoring block, which is the method’s mainparameter. Relevant statistical issues regarding packet lossesand delays are analysed. Finally, the measurement method isdiscussed in the context of applications, as well as networkand service management systems in general.

No description available.

<p> A common goal among nurse educators is to adequately prepare graduates to be competent, caring professionals who deliver the highest standard of care. For the nursing school graduate, the first step to attaining this goal is success on the NCLEX-RN. Nurse educators are constantly seeking new strategies to help better prepare graduates for first time NCLEX-RN success. The purpose of this study was to examine the relationship between student access to computer-adaptive quizzing software program during the final semester of a baccalaureate nursing program and first time NCLEX-RN success. </p><p> Employing the principles of retrieval practice theory, computer-adaptive quizzing is a strategy used in nursing education to allow students to study, evaluate, remediate, and reevaluate mastery of nursing concepts. Computer-adaptive quizzing was developed using the foundational principles of computer-adaptive testing and item response theory, which have been utilized in education, psychology, and computer science for many years. </p><p> A retrospective, descriptive correlational design was used to compare NCLEX-RN outcomes of one cohort of students who did not have access to the computer-adaptive quizzing software (<i>n</i>=99) and one cohort who did have access (<i>n</i>=96). The computer-adaptive quizzing software program that was used in this study was PassPoint^&reg;, a product of Wolters Kluwer Health. There were no statistically significant differences between the two cohorts related to age, gender, race, pre-nursing science GPA, nursing GPA, nursing course failures, and if other degrees were held. There were no major course changes or revisions over the four semesters of the study other than the implementation of the PassPoint adaptive quizzing software. Chi-square analysis suggested that there was an association between having access to and using the software and NCLEX-RN success (<i>p</i>&lt; .001; <i>df</i>=1) with 16.16% of those not having access being unsuccessful on the NCLEX-RN compared to 1.05% of those with access being unsuccessful. Logistic regression showed the predictive model significantly predicted that 18% of the variability of NCLEX-RN success could be linked with usage of the adaptive quizzing software.</p>

<p> Research has shown that the working environment of physical education influences teacher motivation. Identifying the characteristics of teachers&rsquo; working environment may contribute to developing a productive and motivating working environment for physical education teachers. </p><p> The first part of this dissertation study was focused on developing and validating an instrument that measures physical education teachers&rsquo; job demands/resources perception on five theorized dimensions: organizational resources, physical resources, cognitive demands, physical demands, and emotional demands. The content validity was achieved through expert evaluation of the consistency between the items and the dimensions they represent. The evaluation rendered an average consistency rating of 3.6 on a 5 point scale. The construct validity and reliability were determined with a physical education teacher sample (n=193). Exploratory factor analysis (EFA) established a five-dimension construct structure matching the theoretical construct with factor loadings ranging from .57 to .85. The intraclass correlational coefficients ranged from .75 to .80 for job resources and from .80 to .83 for job demands, respectively. The inter-scale correlational coefficients ranged from .14 to .25, showing both convergent and divergent validity. Confirmatory factor analysis (CFA) confirmed the construct structure found in the EFA with high dimensional factor loadings ranging from .47 to .81 for job resources scale and from .51 to .86 for job demands scale. The model fit tests produced acceptable indices including the RMSEA &lt; .05. It is concluded that the instrument met the required psychometric standards to be useful to measure physical education teachers&rsquo; perception of their working environment. </p><p> The second part of the study was to determine the extent to which the perceived job demands and resources influence physical education teachers&rsquo; motivation regulatory processes and motivation. An <i>a priori</i> model was proposed for testing based on the integration of the Self-Determination Theory (SDT) and Job Demands-Resources Model. Certified physical education teachers in two southeastern states (n=193) provided self-reported data on perceived job demands and resources in the working environment, motivation regulatory processes, and motivation to teach. Structural equation modeling analysis revealed that increasing job demands in working environment enabled the teachers to adopt more autonomous regulatory processes, such as integrated regulation (&gamma; = .20) but not more controlling regulatory processes, such as external regulation (&gamma; = -.16) and introjected regulation (&gamma; = -.22). The findings of the study provide empirical evidence that relate perceptions of working environment to physical education teachers&rsquo; motivation to teach.</p>

<p> This quantitative, ex post facto study examined the impact a districtwide high school one-to-one mobile technology initiative had on the number of 10^th grade students in the Forney Independent School District (ISD) (Texas) who passed their standardized TAKS tests during the 2010 academic year. The research study used annual public Forney ISD (Texas) data obtained from the Texas Education Agency (TEA) website. The study compared the 2009 academic year when 10^th grade students (n=520) did not have one-to-one mobile technology and the 2010 academic year when 10^th grade students (n=530) were able to use one-to-one mobile technology as their personal school and home device. Findings from the study determined if there was a statistically significant relationship between one-to-one mobile technology and the number of 10^th grade students who passed their standardized TAKS tests during the 2010 academic year. With a chi-square critical value of 3.84 the results of the study showed a statistically significant relationship between the number of 10^th grade students who passed their TAKS tests in 2010 with one-to-one mobile technology. In 2010, the number of 10^th grade students who passed the English Language Arts test increased by 5% (92% to 97%) with a chi-square statistic of 12.86. The number of students who passed the Math test increased by 18% (65% to 83%) with a chi-square statistic of 44.39. The number of students who passed the Science test increased by 12% (70% to 82%) with a chi-square statistic of 21.04. The number of students who passed the Social Studies test increased by 6% (90% to 96%) with a chi-square statistic of 14.79. The number of 10^th grade students who passed all of their TAKS tests increased by 18% (57% to 75%) with a chi-square statistic of 38.67. The theoretical framework was constructed by the dual coding theory of Alan Pavio and the multiple intelligence theory of Howard Gardner.</p>

No description available.

A method for acquiring and analyzing ultrasonic wavefields to characterize scattering from defects is described. A laser vibrometer and XY scanner are used to record high resolution wavefield data for angle-beam waves propagating in both a defect-free plate and a plate containing crack-like defects emanating from a through-hole. The properties of angle-beam wave propagation are first studied, which include wave generation mechanisms, propagation trajectories, and apparent phase velocities on the measurement surface. Scattering from a defect of interest is then analyzed by subtracting wavefields recorded before and after introduction of the defect. Wavefield subtraction is very sensitive to unavoidable spatial misalignment, which must be corrected prior to subtraction. Two methods for aligning wavefield data sets prior to subtraction are described and their performance is assessed. Several methods for characterizing scattering, including radial energy plots and scattering patterns, are described and used to quantify scattering from the introduced defects. Finally, efficacy of the scattering characterization methods is discussed and recommendations are made for future work.

This thesis defines a methodology for the evaluation of the worth of streamflow data using a Bayes risk approach. Using regional streamflow data in a regression analysis, the Bayes risk can be computed by considering the probability of the error in using the regionalized estimates of bridge or culvert design parameters. Cost curves for over- and underestimation of the design parameter can be generated based on the error of the estimate. The Bayes risk can then be computed by integrating the probability of estimation error over the cost curves. The methodology may then be used to analyze the regional data collection effort by considering the worth of data for a record site relative to the other sites contributing to the regression equations. The methodology is illustrated by using a set of actual streamflow data from Missouri. The cost curves for over- and underestimation of the streamflow design parameter for bridges and culverts are hypothesized so that the Bayes risk might be computed and the results of the analysis discussed. The results are discussed by demonstrating small sample bias that is introduced into the estimate of the design parameter for the construction of bridges and culverts. The conclusions are that the small sample bias in the estimation of large floods can be substantial and that the Bayes risk methodology can evaluate the relative worth of data when the data are used in regionalization.