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Morone, Daniel Justin Reese. "Progressive Collapse: Simplified Analysis Using Experimental Data." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354602937.
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Elvik, Gary G. "Frequency response analysis of T-ACS experimental data." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384673.
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Urgueira, Antonio Paulo Vale. "Dynamic analysis of coupled structures using experimental data." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46590.
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Henning, Gustav. "Visualization of neural data : Dynamic representation and analysis of accumulated experimental data." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166770.
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The scientific method is an integral part of the investigation and exploration of hypotheses. Although procedures may vary from one field to the next, most have common identifiable stages. Today, there is no lack of tools that illustrate data in different graphical mediums. This thesis focuses instead on the type of tools that researchers use to investigate their hypotheses’ validity.When a sufficient amount of data is gathered, it can be presented for analysis in meaningful ways to illustrate patterns or abnormalities that would otherwise go unnoticed when only viewed in raw numbers. However useful static visualization of data can be when presented in ascientific paper, researchers are often overwhelmed by the number of plots and graphs that can be made using only a sliver of data. Therefore, this thesis will introduce software which purpose is to demonstrate the needs of researchers inanalyzing data from repeated experiments in order to speed up the process of recognizing variations between them.Den vetenskapliga metoden är en integral del av undersökningen och utforskandet av hypoteser. Medan procedurer varierar mellan fält liknar de varandra i stora drag. Idag finns det ingen brist på verktyg som visualiserar data i olika grafiska kontexter. Istället fokuserar denna tes på de typ av verktyg som forskare använder för att undersöka integriteten av hypoteser. När tillräckligt med data samlats finns det olika sätt att presentera denna på ett meningsfullt sätt för att demonstrera mönster och avvikelser som skulle förbli osedda i endast siffror. Hurvida användbar statisk visualisering av data är som grafik till vetenskapliga rapporter gäller nödvändigtvis inte samma sak vid analys på grund av de många kombinationer av visualisering som ofta finns. Mjukvara kommer att introduceras för att demonstrera behovet av dynamisk representation vid analys av ackumulerad data för att påskynda upptäckten av mönster och avvikelser.
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Mantrala, Ravi K. "Squeak and rattle detection a comparative experimental data analysis /." Cincinnati, Ohio : University of Cincinnati, 2008. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1204678221.
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Thesis (M.S.)--University of Cincinnati, 2008.Advisor: Dr. Randall J Allemang. Title from electronic thesis title page (viewed Apr.30, 2008). Includes abstract. Keywords: Wavelet Transform, Morlet, Squeak and Rattle. Includes bibliographical references.
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MANTRALA, RAVI K. "Squeak and Rattle Detection: A Comparative Experimental Data Analysis." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204678221.
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Kang, Lulu. "Computer and physical experiments: design, modeling, and multivariate interpolation." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34805.
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Many problems in science and engineering are solved through experimental investigations. Because experiments can be costly and time consuming, it is important to efficiently design the experiment so that maximum information about the problem can be obtained. It is also important to devise efficient statistical methods to analyze the experimental data so that none of the information is lost. This thesis makes contributions on several aspects in the field of design and analysis of experiments. It consists of two parts. The first part focuses on physical experiments, and the second part on computer experiments.
The first part on physical experiments contains three works. The first work develops Bayesian experimental designs for robustness studies, which can be applied in industries for quality improvement. The existing methods rely on modifying effect hierarchy principle to give more importance to control-by-noise interactions, which can violate the true effect order of a system because the order should not depend on the objective of an experiment. The proposed Bayesian approach uses a prior distribution to capture the effect hierarchy property and then uses an optimal design criterion to satisfy the robustness objectives. The second work extends the above Bayesian approach to blocked experimental designs. The third work proposes a new modeling and design strategy for mixture-of-mixtures experiments and applies it in the optimization of Pringles potato crisps. The proposed model substantially reduces the number of parameters in the existing multiple-Scheffé model and thus, helps the engineers to design much smaller experiments.
The second part on computer experiments introduces two new methods for analyzing the data. The first is an interpolation method called regression-based inverse distance weighting (RIDW) method, which is shown to overcome some of the computational and numerical problems associated with kriging, particularly in dealing with large data and/or high dimensional problems. In the second work, we introduce a general nonparametric regression method, called kernel sum regression. More importantly, we make an interesting discovery by showing that a particular form of this regression method becomes an interpolation method, which can be used to analyze computer experiments with deterministic outputs.
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Newton, Wesley E. "Data Analysis Using Experimental Design Model Factorial Analysis of Variance/Covariance (DMAOVC.BAS)." DigitalCommons@USU, 1985. https://digitalcommons.usu.edu/etd/6378.
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DMAOVC.BAS is a computer program written in the compiler version of microsoft basic which performs factorial analysis of variance/covariance with expected mean squares. The program accommodates factorial and other hierarchical experimental designs with balanced sets of data. The program is writ ten for use on most modest sized microprocessors, in which the compiler is available. The program is parameter file driven where the parameter file consists of the response variable structure, the experimental design model expressed in a similar structure as seen in most textbooks, information concerning the factors (i.e. fixed or random, and the number of levels), and necessary information to perform covariance analysis. The results of the analysis are written to separate files in a format that can be used for reporting purposes and further computations if needed.
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Jaques, Alonso V. "Development of advanced methods for analysis of experimental data in diffusion." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3387810.
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Aman, Carolyn J. "The devaluation of women's work: Analysis of national and experimental data." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289050.
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Different explanations have been given for the sex gap in pay between male and female occupations. Comparable worth proponents argue predominantly female occupations pay less than comparable male occupations because of their sex composition, that occupations' sex composition affects their wages. In contrast, Reskin and Roos (1990) and Strober (1984) argue the correspondence between occupational sex composition and wages is due to employers' preferences for male workers. Given first choice of occupations, males choose the better compensated occupations, which results in a causal effect of occupational wages on sex composition. Despite these opposing causal claims, few studies have attempted to ascertain the causal order between occupational sex composition and wages. This research focuses on the relationship between occupational sex composition and wages during the 1980s. Consistent with causal assumption of comparable worth proponents, analyses of Current Population Survey data (Study 1) support a causal effect of occupational sex composition on wages. Study 1 demonstrates that sex composition has a linear effect on wages for females and a nonlinear effect on wages for males. For both males and females, sex composition has a negative effect on wages over the entire range of sex composition. Study 2 revisits the causality question using 1980 and 1990 Census data, supplemented by additional controls from other data sets and finds a nonlinear effect of occupational sex composition on wages for females, but not for males. A negative effect of wages on sex composition was not found in any of the models. These results suggest that males may be less susceptible to the negative effects of sex composition than females. Study III uses an experimental study to determine if a "devaluation by association process" accounts for the lower wages of female occupations. The study found males but not females engage in a devaluation by association process, but neither males nor females devalue occupations based on their association with women. This may be indicative of a decline in the importance of sex as a diffuse status characteristic. The combined results of these studies suggest cautious optimism as far as reducing the sex gap in pay is concerned.
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Freier, Lars [Verfasser]. "Kriging Based Data Analysis and Experimental Design in Biotechnology / Lars Freier." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2018. http://d-nb.info/1152436848/34.
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Sarmad, Majid. "Robust data analysis for factorial experimental designs : improved methods and software." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2432/.
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Factorial experimental designs are a large family of experimental designs. Robust statistics has been a subject of considerable research in recent decades. Therefore, robust analysis of factorial designs is applicable to many real problems. Seheult and Tukey (2001) suggested a method of robust analysis of variance for a full factorial design without replication. Their method is generalised for many other factorial designs without the restriction of one observation in each cell. Furthermore, a new algorithm to decompose data from a factorial design is introduced and programmed in the statistical computer package R. The whole procedure of robust data analysis is also programmed in R and it is intended to submit the library to the repository of R software, CRAN. In the procedure of robust data analysis, a cut-off value is needed to detect possible outliers. A set of optimum cut-off values for univariate data and some dimensions of two-way designs (complete and incomplete) has also been provided using an improved design of simulation study.
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Chilenski, Mark Alan. "Experimental data analysis techniques for validation of Tokamak impurity transport simulations." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112393.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages [234]-309).
This thesis presents two new techniques for analyzing data from impurity transport experiments in magnetically confined plasmas, with specific applications to the Alcator C-Mod tokamak. The objective in developing these new techniques is to improve the quality of the experimental results used to test simulations of turbulent transport: better characterization of the uncertainty in the experimental results will yield a better test of the simulations. Transport codes are highly sensitive to the gradients of the background temperature and density profiles, so the first half of this thesis presents a new approach to fitting tokamak profiles using nonstationary Gaussian process regression. This powerful technique overcomes many of the shortcomings of previous spline-based data smoothing techniques, and can even handle more complicated cases such as line-integrated measurements, computation of second derivatives, and 2d fitting of spatially- and temporally-resolved measurements. The second half of this thesis focuses on experimental measurements of impurity transport coefficients. It is shown that there are considerable shortcomings in existing point estimates of these quantities. Next, a linearized model of impurity transport data is constructed and used to estimate diagnostic requirements for impurity transport measurements. It is found that spatial resolution is more important than temporal resolution. Finally, a fully Bayesian approach to inferring experimental impurity transport coefficient profiles which overcomes the shortcomings of the previous approaches through use of multimodal nested sampling is developed and benchmarked using synthetic data. These tests reveal that uncertainties in the transport coefficient profiles previously attributed to uncertainties in the temperature and density profiles are in fact entirely explained by changes in the spline knot positions. Appendices are provided describing the extensive work done to determine the derivatives of stationary and nonstationary covariance kernels and the open source software developed as part of this thesis work. The techniques developed here will enable more rigorous benchmarking of turbulent transport simulations, with the ultimate goal of developing a predictive capability.
by Mark Alan Chilenski.
Ph. D.
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Hanna, Richard Matthew 1979. "Viscoelastic polymer analysis : experimental, data analysis, and modeling techniques applied to cellular silicone foam." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89357.
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Larson, Michael Andrew. "A Progressive Refinement of Postural Human Balance Models Based on Experimental Data Using Topological Data Analysis." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami159620428141697.
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Kahyaoglu, Nazli Deniz. "Spectral And Statistical Analyses Of Experimental Radar Clutter Data." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612799/index.pdf.
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The performance of radar detection and imaging systems strongly depends on the characteristics of radar clutter. In order to improve the radar signal processing algorithms, successful analysis and modeling of radar clutter are required. For a successful model of radar clutter, both the spectral and statistical characteristics of the clutter should be revealed. Within the scope of this study, an experimental radar data acquisition system is established to analyze radar clutter. The hardware and the data processing system are first verified using generic signals and then a set of measurements is taken in the open terrain. In this thesis, the limitations and problems encountered during the establishment of the system are explained in detail. The spectral and statistical analyses performed on the recorded data are examined. The temporal
and spatial behavior of the measured clutter data are explored. The hypothetical models proposed so far in the literature are tested on the experimental data and the fitting of models to the experimental data is confirmed using various goodness-of-fit tests. Finally, the results of the analyses are interpreted in the light of the radar system parameters and the characteristics of the illuminated terrain.
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Kleinknecht, Mathias, and Álvarez Alfredo Fernández. "Wind turbine blade modeling - setting out from experimental data." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-26054.
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Complex systems can be divided into simpler substructures. Determining the properties of each subcomponent by experimental procedures is practical and can serve to verify or calibrate finite element models. In this work, an existing model of a wind turbine blade was improved by use of experimental data. Such a blade is a subpart of a complete wind turbine. For calibration purpose, several material tests were made in order to determine the stiffness and mass properties. Later on, vibration tests of the blades were conducted and compared with simulation results of the improved model. Geometry variability within sets of blades was also studied. The blade twist angles and the center of gravity positions were found to vary moderately, which accounts for differences in blades’ dynamic behavior. Correlations between experimental data and analytical model results were very high for the first eight modeshapes. That is, according to the Model Assurance Criterion the calibrated model achieves a high-quality representation of reality. However, torsional modes in the computer model occur at a higher frequency than the experimental ones. Substructuring of the turbine allows the blades to be modeled and validated independently of the other substructures and can later be incorporated into a complete model of the turbine.
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Aerts, Xing Qin. "Time Series Data Analysis of Single Subject Experimental Designs Using Bayesian Estimation." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804882/.
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This study presents a set of data analysis approaches for single subject designs (SSDs). The primary purpose is to establish a series of statistical models to supplement visual analysis in single subject research using Bayesian estimation. Linear modeling approach has been used to study level and trend changes. I propose an alternate approach that treats the phase change-point between the baseline and intervention conditions as an unknown parameter. Similar to some existing approaches, the models take into account changes in slopes and intercepts in the presence of serial dependency. The Bayesian procedure used to estimate the parameters and analyze the data is described. Researchers use a variety of statistical analysis methods to analyze different single subject research designs. This dissertation presents a series of statistical models to model data from various conditions: the baseline phase, A-B design, A-B-A-B design, multiple baseline design, alternating treatments design, and changing criterion design. The change-point evaluation method can provide additional confirmation of causal effect of the treatment on target behavior. Software codes are provided as supplemental materials in the appendices. The applicability for the analyses is demonstrated using five examples from the SSD literature.
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Hasan, Ahmad Bilal. "Multi-node experimental data analysis for wireless link characterization using SensorFlock system." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453488.
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Nair, Hema. "Evaluation of an Experimental Data Management System for Program Data at the College Level." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2016. http://digitalcommons.auctr.edu/cauetds/45.
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An experimental data management system has been designed, developed, and implemented in this dissertation. The system satisfies the requirements specifications of the Department of Curriculum and Instruction in the School of Education. The university in this study has installed some learning management systems and assessment systems, such as Banner®, Canvas®, TracDat®, and Taskstream® (university’s name is omitted for anonymity purposes). These systems individually do not perform the necessary data analysis and data management to generate appropriate reports. The system developed in this study can generate more metrics and quantitative measures for reporting purposes within a shorter time. These metrics provide credible evidence for accreditation.
Leadership is concerned with improving the effectiveness, efficiency, accountability, and performance of educational programs. The continuity, sustainability, and financial support of programs depend on demonstrating the evidence that they are effective and efficient, that they meet their objectives, and that they contribute to the mission and the vision of the educational institution. Leadership has to employ all means at its disposal in order to collect such evidence. The data management system provides comprehensive data analysis that can be utilized as evidence by the leadership to accomplish its goals.
The pilot system developed in this research is web-based and platform independent. It leverages the power of Java® at the front-endand combines the reliability and stability of Oracle® as the back-end database. It has been tested on-site by some members of the departmental faculty and one administrator from the Dean’s Office in the School of Education.
This research is a mixed methods study with quasi-experimental treatment. It is a single case experimental study. There is no control group. The sample chosen is a convenient sample.
The results of this study indicate that the system is highly usable for assessment work. The data analysis results generated by the system are also actionable. These results assist by identifying gaps in student performance and in curriculum and instruction practices.
In the future, the system developed in this dissertation can be extended to other departments in the School of Education. Some implications are provided in the concluding chapter of this dissertation.
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Emerton, Guy. "Data-driven methods for exploratory analysis in chemometrics and scientific experimentation." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86366.
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Thesis (MSc)--Stellenbosch University, 2014.ENGLISH ABSTRACT: Background New methods to facilitate exploratory analysis in scientific data are in high demand. There is an abundance of available data used only for confirmatory analysis from which new hypotheses can be drawn. To this end, two new exploratory techniques are developed: one for chemometrics and another for visualisation of fundamental scientific experiments. The former transforms large-scale multiple raw HPLC/UV-vis data into a conserved set of putative features - something not often attempted outside of Mass-Spectrometry. The latter method ('StatNet'), applies network techniques to the results of designed experiments to gain new perspective on variable relations. Results The resultant data format from un-targeted chemometric processing was amenable to both chemical and statistical analysis. It proved to have integrity when machine-learning techniques were applied to infer attributes of the experimental set-up. The visualisation techniques were equally successful in generating hypotheses, and were easily extendible to three different types of experimental results. Conclusion The overall aim was to create useful tools for hypothesis generation in a variety of data. This has been largely reached through a combination of novel and existing techniques. It is hoped that the methods here presented are further applied and developed.
AFRIKAANSE OPSOMMING: Agtergrond Nuwe metodes om ondersoekende ontleding in wetenskaplike data te fasiliteer is in groot aanvraag. Daar is 'n oorvloed van beskikbaar data wat slegs gebruik word vir bevestigende ontleding waaruit nuwe hipoteses opgestel kan word. Vir hierdie doel, word twee nuwe ondersoekende tegnieke ontwikkel: een vir chemometrie en 'n ander vir die visualisering van fundamentele wetenskaplike eksperimente. Die eersgenoemde transformeer grootskaalse veelvoudige rou HPLC / UV-vis data in 'n bewaarde stel putatiewe funksies - iets wat nie gereeld buite Massaspektrometrie aangepak word nie. Die laasgenoemde metode ('StatNet') pas netwerktegnieke tot die resultate van ontwerpte eksperimente toe om sodoende ân nuwe perspektief op veranderlike verhoudings te verkry. Resultate Die gevolglike data formaat van die ongeteikende chemometriese verwerking was in 'n formaat wat vatbaar is vir beide chemiese en statistiese analise. Daar is bewys dat dit integriteit gehad het wanneer masjienleertegnieke toegepas is om eienskappe van die eksperimentele opstelling af te lei. Die visualiseringtegnieke was ewe suksesvol in die generering van hipoteses, en ook maklik uitbreibaar na drie verskillende tipes eksperimentele resultate. Samevatting Die hoofdoel was om nuttige middele vir hipotese generasie in 'n verskeidenheid van data te skep. Dit is grootliks bereik deur 'n kombinasie van oorspronklike en bestaande tegnieke. Hopelik sal die metodes wat hier aangebied is verder toegepas en ontwikkel word.
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Davis, Roosevelt. "Determinig dynamic properties of elastic coupling using experimental data and finite element analysis." Master's thesis, Mississippi State : Mississippi State University, 2003. http://library.msstate.edu/etd/show.asp?etd=etd-07242003-163336.
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MacKelvie, Erin. "A Comparison of Traditional Aggregated Data to a Comprehensive Second-by-Second Data Depiction in Functional Analysis Graphs." Scholarly Commons, 2021. https://scholarlycommons.pacific.edu/uop_etds/3730.
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Functional analyses (FAs) are an important component of treatment and the data gathered from FAs are often graphed in an aggregate or summary format, such as mean rate per session. Given the prevalence of undifferentiated analyses, it may be that this common method of data depiction is incomplete. In this paper, we compare the traditional aggregate method to a comprehensive second-by-second demonstration of the data including all appropriate and inappropriate responses emitted, as well as programmed and accidental antecedent and consequent variables, which may help further clarify the results of a functional analysis. We compared the functional analysis results of two participants when the data were depicted using the traditional rate aggregate method and depicted using a comprehensive second-by-second method. Although both rate and comprehensive second-by-second data depiction resulted in similar conclusions regarding the maintaining variables for the participants, comprehensive second-by-second data depiction allowed us to draw the conclusions in less time. Additional advantages and disadvantages of each method as it relates to efficiency, therapeutic risk and safety, and practicality are also discussed. Keywords: efficiency, functional analysis, problem behavior, safety, within-session second-by-second analysis.
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Arango, Lisa Lewis. "The utility of an integrated qualitative/quantitative data analytic strategy (IQ-DAS) to evaluate the impact of youth development interventions on positive qualitative change in the life course." FIU Digital Commons, 2003. http://digitalcommons.fiu.edu/etd/1294.
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This study reports one of the first controlled studies to examine the impact of a school based positive youth development program (Lerner, Fisher, & Weinberg, 2000) on promoting qualitative change in life course experiences as a positive intervention outcome. The study built on a recently proposed relational developmental methodological metanarrative (Overton, 1998) and advances in use of qualitative research methods (Denzin & Lincoln, 2000). The study investigated the use the Life Course Interview (Clausen, 1998) and an integrated qualitative and quantitative data analytic strategy (IQDAS) to provide empirical documentation of the impact the Changing Lives Program on qualitative change in positive identity in a multicultural population of troubled youth in an alternative public high school. The psychosocial life course intervention approach used in this study draws its developmental framework from both psychosocial developmental theory (Erikson, 1968) and life course theory (Elder, 1998) and its intervention strategies from the transformative pedagogy of Freire's (1983/1970).
Using the 22 participants in the Intervention Condition and the 10 participants in the Control Condition, RMANOVAs found significantly more positive qualitative change in personal identity for program participants relative to the non-intervention control condition. In addition, the 2X2X2X3 mixed design RMANOVA in which Time (pre, post) was the repeated factor and Condition (Intervention versus Control), Gender, and Ethnicity the between group factors, also found significant interactions for the Time by Gender and Time by Ethnicity.
Moreover, the directionality of the basic pattern of change was positive for participants of both genders and all three ethnic groups. The pattern of the moderation effects also indicated a marked tendency for participants in the intervention group to characterize their sense of self as more secure and less negative at the end of the their first semester in the intervention, that was stable across both genders and all three ethnicities. The basic differential pattern of an increase in the intervention condition of a positive characterization of sense of self relative to both pre test and relative to the directionality of the movement of the non-intervention controls, was stable across both genders and all three ethnic groups.
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Jakobsen, Fredrik G. "Estimation of Seismic Parameters by Source Strength Variation : An Experimental Analysis using Valhall Data." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22431.
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In 2008 at SEG's annual meeting Professor Martin Landrø proposed a new way of deriving 4D noise by source strength variation. It was proposed that by shooting two surveys over the exact same area and process the datasets as two surveys in a 4D survey, the sensitivity of the 4D set-up could be determined. Based on this proposal BP Norge decided to shot a test with firing pressure 1750 psi, in contrast to the 2000 psi production pressure. These two datasets constitutes the data analysed in this thesis. No known work has been done one this type of data and an experimental approach was used in order to find application for the extra information given by varying the source strength.Several analysis done on the amplitude effect of the pressure variation suggested a less dramatical change in amplitude (around 5\%) than the established literature suggested (8.5\%). The frequency dependence of the amplitude change has also been investigated and is still not perfectly understood.Estimation of a noise profile has been done by several different methods suggesting both a continuously increase in noise with depth as well as a more intricate behaviour. The validity of these noise estiamtion are not perfectly understood and care should be given when evaluating the results.A new method for deriving the formation quality factor is also proposed. This method is considered to have great potential and although the derived quality factors were found to be inconsistent and illogical, it is believed that with better processing and greater source amplitude change this method could be used by the industry.
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Huang, Chen-Fen. "A Bayesian approach to matched-field geoacoustic inversion with analysis of ASIAEX experimental data /." Diss., Connect to a 24 p. preview or request complete full text in PDF formate. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3191986.
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Bell, Edwina E. "The development of an expert systems approach to the statistical analysis of experimental data." Thesis, University of Greenwich, 1988. http://gala.gre.ac.uk/5798/.
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This thesis is concerned with the application of expert systems techniques in the field of statistics. An expert statistician in industry has a twofold role; undertaking the design and analysis of data from complex experiments and providing supervision and help for research workers who analyse data from simpler designs. There is, therefore, a potential role for a statistical expert system which could be used by research workers to enable them to carry out valid analyses. The expert statistician would be freed from the more straightforward analyses and would only need to deal with referrals from the system and to initially 'tune' the system to their own application area. The design and development of such a prototype expert system, THESEUS, is the basis of this work. The area of application chosen for the prototype system is completely randomised designs with one trial factor. It was initially important to limit the area of study so that knowledge acquisition for the system would be a manageable task. However, once the difficulties in developing an expert system have been tackled, much of the expertise used in analysing this simple type of study could be readily extended to more complex designs. The knowledge acquisition phase, the most time consuming part of developing any expert system, concentrated on developing a rational prototype rule base by reviewing the available literature, interviewing practising statisticians and undertaking workshops where the analysis of particular data sets was discussed. The prototype software is a production rule system and is written in Turbo Pascal on an IBM-AT. Pascal was chosen because of the need to access statistical routines during the consultation process. The prototype uses a combination of forward and backward chaining to process the rules. Information required by the system can come from the user, the data or the rules. The overall system design also includes facilities for entering and editing data, altering and adding knowledge and a report generator. Implementation of these facilities is not incorporated as part of this thesis. A small number of trial sites were selected for industrial trials in order to validate the system and evaluate the results of the local experts 'tuning' of the rule base to their own particular application area.
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Ruhnow, Felix. "Estimating the motility parameters of single motor proteins from censored experimental data." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-216854.
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Cytoskeletal motor proteins are essential to the function of a wide range of intra-cellular mechano-systems. The biophysical characterization of the movement of motor proteins along their filamentous tracks is therefore of large importance. Towards this end, in vitro stepping motility assays are commonly used to determine the motor’s velocities and runlengths. However, comparing results from such experiments has proved difficult due to influences from variations in the experimental setups, the experimental conditions and the data analysis methods. This work describes a novel unified method to evaluate traces of fluorescently-labeled, processive dimeric motor proteins and proposes an algorithm to correct the measurements for finite filament length as well as photobleaching. Statistical errors of the proposed evaluation method are estimated by a bootstrap method. Numerical simulation and experimental data from GFP-labeled kinesin-1 motors stepping along immobilized microtubules was used to verify the proposed approach and it was shown (i) that the velocity distribution should be fitted by a t location-scale probability density function rather than a normal distribution, (ii) that the temperature during the experiments should be controlled with a precision well below 1 K, (iii) that the impossibility to measure events shorter than the image acquisition time needs to be accounted for, (iv) that the motor’s runlength can be estimated independent of the filament length distribution, and (v) that the dimeric nature of the motors needs to be considered when correcting for photobleaching. This allows for a better statistical comparison of motor proteins influenced by other external factors e.g. ionic strength, ATP concentration, or post-translational modifications of the filaments. In this context, the described method was then applied to experimental data to investigate the influence of the nucleotide state of the microtubule on the motility behavior of the kinesin-1 motor proteins. Here, a small but significant difference in the velocity measurements was found, but no significant difference in the runlength and interaction time measurements. Consequently, this work provides a framework for the evaluation of a wide range of experiments with single fluorescently-labeled motor proteins.
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Singleton, Michael David. "Nonlinear Hierarchical Models for Longitudinal Experimental Infection Studies." UKnowledge, 2015. http://uknowledge.uky.edu/epb_etds/7.
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Experimental infection (EI) studies, involving the intentional inoculation of animal or human subjects with an infectious agent under controlled conditions, have a long history in infectious disease research. Longitudinal infection response data often arise in EI studies designed to demonstrate vaccine efficacy, explore disease etiology, pathogenesis and transmission, or understand the host immune response to infection. Viral loads, antibody titers, symptom scores and body temperature are a few of the outcome variables commonly studied. Longitudinal EI data are inherently nonlinear, often with single-peaked response trajectories with a common pre- and post-infection baseline. Such data are frequently analyzed with statistical methods that are inefficient and arguably inappropriate, such as repeated measures analysis of variance (RM-ANOVA). Newer statistical approaches may offer substantial gains in accuracy and precision of parameter estimation and power. We propose an alternative approach to modeling single-peaked, longitudinal EI data that incorporates recent developments in nonlinear hierarchical models and Bayesian statistics. We begin by introducing a nonlinear mixed model (NLMM) for a symmetric infection response variable. We employ a standard NLMM assuming normally distributed errors and a Gaussian mean response function. The parameters of the model correspond directly to biologically meaningful properties of the infection response, including baseline, peak intensity, time to peak and spread. Through Monte Carlo simulation studies we demonstrate that the model outperforms RM-ANOVA on most measures of parameter estimation and power. Next we generalize the symmetric NLMM to allow modeling of variables with asymmetric time course. We implement the asymmetric model as a Bayesian nonlinear hierarchical model (NLHM) and discuss advantages of the Bayesian approach. Two illustrative applications are provided. Finally we consider modeling of viral load. For several reasons, a normal-errors model is not appropriate for viral load. We propose and illustrate a Bayesian NLHM with the individual responses at each time point modeled as a Poisson random variable with the means across time points related through a Tricube mean response function. We conclude with discussion of limitations and open questions, and a brief survey of broader applications of these models.
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Ganatra, Nirmal Kirtikumar. "Validation of computer-generated results with experimental data obtained for torsional vibration of synchronous motor-driven turbomachinery." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/499.
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Torsional vibration is an oscillatory angular twisting motion in the rotating members of a system. It can be deemed quite dangerous in that it cannot be detected as easily as other forms of vibration, and hence, subsequent failures that it leads to are often abrupt and may cause direct breakage of the shafts of the drive train. The need for sufficient analysis during the design stage of a rotating machine is, thus, well justified in order to avoid expensive modifications during later stages of the manufacturing process. In 1998, a project was initiated by the Turbomachinery Research Consortium (TRC) at Texas A&M University, College Station, TX, to develop a suite of computer codes to model torsional vibration of large drive trains. The author had the privilege of developing some modules in Visual Basic for Applications (VBA-Excel) for this suite of torsional vibration analysis codes, now collectively called XLTRC-Torsion. This treatise parleys the theory behind torsional vibration analysis using both the Transfer Matrix approach and the Finite Element approach, and in particular, validates the results generated by XLTRC-Torsion based on those approaches using experimental data available from tests on a 66,000 HP Air Compressor.
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Rivai, Kathryn. "Data analysis of experimental test results of a wave energy converter for the WECfarm project." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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There are different technologies to exploit marine energy, one of these is wave energy converters (WEC), that use the energy of the waves to produce electricity. To maximize the power production, the WECs are placed in arrays with specific geometric configurations, therefore it is important to study the interaction between the WECs (near-field interactions) and the effects of the WEC array on the waves behind the array (far-field effects).
A single ‘Master WEC’ is being developed, tested and fine-tuned prior to the array layout tests. The aim is to investigate and improve the behavior of the new WEC design, through tests in different waves conditions. The new shape of the WEC has been designed using a numerical study in order to improve the behavior of the WEC, reducing the surge force and increasing its radiation. The objective of this master dissertation is to study the behavior of the scale model (scale factor 0.525) of the hydrodynamic part of the WEC. Several tests were performed in the wave flume in the laboratory of Ghent University, and the obtained database was subsequently analyzed.
First a free decay test was performed to determine the natural period and the damping factor of the buoy.
Then the results from regular waves tests were analyzed to determine the interaction between two buoys using regular waves with different wave periods.
Several tests were conducted to quantify the horizontal and vertical forces acting on the buoy unit, with differing dispositions of the load cells and differing wave heights and periods.
All the tests were performed with a water depth of 0.65 m.
The data obtained from the measuring devices in the tests was processed with MATLAB to check the repeatability of the tests, to obtain graphs, averaged values of the forces and the acceleration acting on the buoy unit, amplitude and phase of the oscillatory motion of the buoy.
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Orlandea, Marcela P. "Analysis of water quality data and experimental study of weathering products in mine waste rock." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/MQ32500.pdf.
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Gelmi, Claudio A. "A novel probabilistic framework for microarray data analysis from fundamental probability models to experimental validation /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 177 p, 2007. http://proquest.umi.com/pqdweb?did=1257806411&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Haar, Marcel von der [Verfasser]. "DNA microarray experimental design and software based data normalization and analysis / Marcel von der Haar." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1150173785/34.
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Llerena, Herrera Isbel. "An automated software for analysis of experimental data on decay heat from spent nuclear fuel." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-188831.
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The Swedish Nuclear Fuel and Waste Management Company (SKB) has developed a method for final disposal of spent nuclear fuel. This technique requires accurate measurement of the residual decay heat of every assembly. For this purpose, depletion codes as well as calorimetric and gamma-ray spectroscopy experimental methods have been developed and evaluated. In this work a prototype analysis tool has been developed to automate the analysis of both calorimetric and gamma-ray spectroscopy measurements. The performance of the analysis tool has been investigated by comparing its output with earlier results and calculations. Parallel to the software development, new measurements on 73 BWR assemblies were performed. The results obtained for the determination of the residual decay heat are presented. Finally, suggestions for further development are outlined and discussed.
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Liu, Chang. "Data Analysis of Minimally-Structured Heterogeneous Logs : An experimental study of log template extraction and anomaly detection based on Recurrent Neural Network and Naive Bayes." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191334.
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Nowadays, the ideas of continuous integration and continuous delivery are under heavy usage in order to achieve rapid software development speed and quick product delivery to the customers with good quality. During the process ofmodern software development, the testing stage has always been with great significance so that the delivered software is meeting all the requirements and with high quality, maintainability, sustainability, scalability, etc. The key assignment of software testing is to find bugs from every test and solve them. The developers and test engineers at Ericsson, who are working on a large scale software architecture, are mainly relying on the logs generated during the testing, which contains important information regarding the system behavior and software status, to debug the software. However, the volume of the data is too big and the variety is too complex and unpredictable, therefore, it is very time consuming and with great efforts for them to manually locate and resolve the bugs from such vast amount of log data. The objective of this thesis project is to explore a way to conduct log analysis efficiently and effectively by applying relevant machine learning algorithms in order to help people quickly detect the test failure and its possible causalities. In this project, a method of preprocessing and clusering original logs is designed and implemented in order to obtain useful data which can be fed to machine learning algorithms. The comparable log analysis, based on two machine learning algorithms - Recurrent Neural Network and Naive Bayes, is conducted for detecting the place of system failures and anomalies. Finally, relevant experimental results are provided and analyzed.
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Christiansen, Jonas Myhre. "DVB-T based Passive Bistatic Radar : Simulated and experimental data analysis of range and Doppler walk." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9849.
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Davis, Roosevelt. "A PREDICTION OF ELASTIC PROPERTIES OF AN ELASTIC COUPLING USING EXPERIMENTAL DATA AND FINITE ELEMENT ANALYSIS." MSSTATE, 2003. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-163336/.
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The dynamic properties of the elastic coupling are not readily known; therefore testing has to be performed in order to determine these properties. This is the primary objective for this thesis. The dynamic properties in question are the stiffness and damping. An attempt to determine the dynamic properties was also be carried out through the use of finite element analysis. There are two different configurations of couplings. One configuration forms the coupling from several elastic elements, referred to as HRC elements, which are manufactured in three sizes: A, B, and C. The second configuration, referred to as the HEMD coupling, has a single elastic member in the form of a hollow rubber/fabric ring connecting the input to the output. The couplings have cords made of either polyester or nylon. These cords will affect the dynamic properties of the coupling.
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Xu, Hong [Verfasser], and X. [Akademischer Betreuer] Cheng. "Improvement of PWR (LOCA) safety analysis based on PKL experimental data / Hong Xu ; Betreuer: X. Cheng." Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1222109468/34.
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Colgary, James J. Jr. "An experimental study of the one Atmosphere Diving Suit (ADS) and data analysis of military diving." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104301.
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Thesis: Nav. E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 93-94).
The Atmospheric Diving Suit (ADS) is a one-man submarine with moveable, humanlike appendages with internal pressure maintained at one atmosphere. This precludes the possibility of common diving related illnesses while giving the operator an increased depth of operation compared to traditional diving systems. The ADS provides additional capability for industries and militaries around the world, but is not without its own unique challenges and limitations. Current ADS maneuverability, specifically that associated with joint rotation, lacks natural movement and range of motion, rendering most normal underwater tasks more challenging and taxing on the operator. Concerns about the lack of maneuverability and usability of the current ADS, primarily raised by the US Navy and ADS operators, prompted the Office of Naval Research (ONR) to fund an investigation into the next-generation ADS. In partnership under a Small Business Technology Transfer (STTR) contract, Mid6 Technology and MIT teamed up to investigate new joint design. To better understand the existing ADS and characterize the kinematics of elbow and shoulder rotation, an experimental test was completed with the commercial OceanWorks 1200 ft HARDSUITTM ADS at Phoenix International. Using a suite of Inertial Measurement Units (IMUs), equivalent ADS elbow and shoulder flexion/extension angles were extracted. A custom MATLAB® script was written to process data based on previous MIT IMU research associated with spacesuit design and other biomedical IMU research. The ADS pilot's movement inside the suit characterized the current suit's maneuverability, baselining capability. This study will inform future joint design by improving the understanding of the current ADS. In conjunction with the kinematic study, a numerical analysis of all military diving data was completed to better understand "how" the military dives. All military dive data is available to the public via www.militarydivingdata.com or http://divingresearch.scripts.mit.edu/militarydivingdata/ .
by James J. Colgary, Jr.
Nav. E.
S.M.
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Rosenblum, Michael. "Phase synchronization of chaotic systems : from theory to experimental applications." Thesis, Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2005/70/.
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In einem klassischen Kontext bedeutet Synchronisierung die Anpassung der Rhythmen von selbst-erregten periodischen Oszillatoren aufgrund ihrer schwachen Wechselwirkung. Der Begriff der Synchronisierung geht auf den berühmten niederläandischen Wissenschaftler Christiaan Huygens im 17. Jahrhundert zurück, der über seine Beobachtungen mit Pendeluhren berichtete. Wenn zwei solche Uhren auf der selben Unterlage plaziert wurden, schwangen ihre Pendel in perfekter Übereinstimmung.
Mathematisch bedeutet das, daß infolge der Kopplung, die Uhren mit gleichen Frequenzen und engverwandten Phasen zu oszillieren begannen.
Als wahrscheinlich ältester beobachteter nichtlinearer Effekt wurde die Synchronisierung erst nach den Arbeiten von E. V. Appleton und B. Van der Pol gegen 1920 verstanden, die die Synchronisierung in Triodengeneratoren systematisch untersucht haben. Seitdem wurde die Theorie gut entwickelt, und hat viele Anwendungen gefunden.
Heutzutage weiss man, dass bestimmte, sogar ziemlich einfache, Systeme, ein chaotisches Verhalten ausüben können. Dies bedeutet, dass ihre Rhythmen unregelmäßig sind und nicht durch nur eine einzige Frequenz charakterisiert werden können.
Wie in der Habilitationsarbeit gezeigt wurde, kann man jedoch den Begriff der Phase und damit auch der Synchronisierung auf chaotische Systeme ausweiten. Wegen ihrer sehr schwachen Wechselwirkung treten Beziehungen zwischen den Phasen und den gemittelten Frequenzen auf und führen damit zur Übereinstimmung der immer noch unregelmäßigen Rhythmen. Dieser Effekt, sogenannter Phasensynchronisierung, konnte später in Laborexperimenten anderer wissenschaftlicher Gruppen bestätigt werden.
Das Verständnis der Synchronisierung unregelmäßiger Oszillatoren erlaubte es uns, wichtige Probleme der Datenanalyse zu untersuchen.
Ein Hauptbeispiel ist das Problem der Identifikation schwacher Wechselwirkungen zwischen Systemen, die nur eine passive Messung erlauben. Diese Situation trifft häufig in lebenden Systemen auf, wo Synchronisierungsphänomene auf jedem Niveau erscheinen - auf der Ebene von Zellen bis hin zu makroskopischen physiologischen Systemen; in normalen Zuständen und auch in Zuständen ernster Pathologie.
Mit unseren Methoden konnten wir eine Anpassung in den Rhythmen von Herz-Kreislauf und Atmungssystem in Menschen feststellen, wobei der Grad ihrer Interaktion mit der Reifung zunimmt. Weiterhin haben wir unsere Algorithmen benutzt, um die Gehirnaktivität von an Parkinson Erkrankten zu analysieren. Die Ergebnisse dieser Kollaboration mit Neurowissenschaftlern zeigen, dass sich verschiedene Gehirnbereiche genau vor Beginn des pathologischen Zitterns synchronisieren. Außerdem gelang es uns, die für das Zittern verantwortliche Gehirnregion zu lokalisieren.
In a classical context, synchronization means adjustment of rhythms of self-sustained periodic oscillators due to their weak interaction. The history of synchronization goes back to the 17th century when the famous Dutch scientist Christiaan Huygens reported on his observation of synchronization of pendulum clocks: when two such clocks were put on a common support, their pendula moved in a perfect agreement. In rigorous terms, it means that due to coupling the clocks started to oscillate with identical frequencies and tightly related phases. Being, probably, the oldest scientifically studied nonlinear effect, synchronization was understood only in 1920-ies when E. V. Appleton and B. Van der Pol systematically - theoretically and experimentally - studied synchronization of triode generators. Since that the theory was well developed and found many applications.
Nowadays it is well-known that certain systems, even rather simple ones, can exhibit chaotic behaviour. It means that their rhythms are irregular, and cannot be characterized only by one frequency. However, as is shown in the Habilitation work, one can extend the notion of phase for systems of this class as well and observe their synchronization, i.e., agreement of their (still irregular!) rhythms: due to very weak interaction there appear relations between the phases and average frequencies. This effect, called phase synchronization, was later confirmed in laboratory experiments of other scientific groups.
Understanding of synchronization of irregular oscillators allowed us to address important problem of data analysis: how to reveal weak interaction between the systems if we cannot influence them, but can only passively observe, measuring some signals. This situation is very often encountered in biology, where synchronization phenomena appear on every level - from cells to macroscopic physiological systems; in normal states as well as in severe pathologies. With our methods we found that cardiovascular and respiratory systems in humans can adjust their rhythms; the strength of their interaction increases with maturation. Next, we used our algorithms to analyse brain activity of Parkinsonian patients. The results of this collaborative work with neuroscientists show that different brain areas synchronize just before the onset of pathological tremor. Morevoever, we succeeded in localization of brain areas responsible for tremor generation.
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Takiya, Carlos. "Problemas inversos em física experimental: a secção de choque fotonuclear e radiação de aniquilação elétron-pósitron." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24022014-113716/.
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Os métodos para resolução de Problemas Inversos aplicados a dados experimentais (Regularização, Bayesianos e Máxima Entropia) foram revistos. O procedimento de Mínimos Quadrados com Regularização por Mínima Variância (MQ-RMV) foi desenvolvido para resolução de Problemas Inversos lineares, tendo sido aplicado em: a) espectros unidimensionais simulados; b)determinação da secção de choque ANTPOT.34 S (, xn) a partir de yield de bremsstrahlung; c)análise da radiação de aniquilação elétron-pósitron em alumínio de experimento de coincidência com dois detetores semicondutores. Os resultados são comparados aos obtidos por outros métodos.The methods used to solve inverse problems applied to experimental data (Regularization, Bayesian and Maximum Entropy) were revised. The Least-Squares procedure with Minimum Variance Regularization (LS-MVR) was developed to solve linear inverse problems, being applied to: a)simulated one-dimensional histograms; b) 34S (, xn) cross-section determination radiation in Aluminum from coincidence experiments with two semiconductor detectors. The results were compared to that obtained by other methods.
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Erdman, Robert W. "Using experimental design and data analysis to study the enlisted specialty model fo the U.S. Army GI." Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Jun/10Jun%5FErdman.pdf.
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Thesis (M.S. in Operations Analysis)--Naval Postgraduate School, June 2010.Thesis Advisor(s): Johnson, Rachel ; Second Reader: Lucas, Tom. "June 2010." Description based on title screen as viewed on July 14, 2010. Author(s) subject terms: Enlisted specialty model, manpower, design of experiments, linear programming, Plackett-Burman design, D-optimal Latin hypercube Includes bibliographical references (p. 49). Also available in print.
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Lawrence, Michael. "Interactive graphics, graphical user interfaces and software interfaces for the analysis of biological experimental data and networks." [Ames, Iowa : Iowa State University], 2008.
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Erdman, Robert W. "Using experimental design and data analysis to study the enlisted specialty model for the U.S. Army G1." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5313.
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Approved for public release; distribution is unlimitedEvery month the U.S. Army G1 uses an Enlisted Specialty (ES) model consisting of a simulation and an optimization to forecast the Army's enlisted manpower program by Military Occupational Specialty and grade. The model is responsible for operating a 30.64 billion dollar manpower program that currently manages 460,000 enlisted Soldiers. The research in this thesis studies the objective function coefficients associated with decision variables in the ES optimization model. Experimental design and analysis techniques were used to study how changes in the coefficients affect the assignment of current enlisted soldiers to vacant positions in the Army. Results of the thesis show that by adjusting eight of the coefficients in the optimization model, the deviation between authorizations and inventory can be reduced by 14%. This improves the U.S. Army's force structure alignment and ensures the Army is ready to fight the nation's wars.
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Barra, Cortés Maximiliano Hernán. "Analysis of beams with transverse opening using a shear-flexure interaction model and validation with experimental data." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/136162.
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Ingeniero CivilUn modelo que combina las respuestas de corte y flexión fue desarrollado por Massone et al. (2006). Este modelo ha sido validado para muros esbeltos y muros cortos (Massone et al., 2009). El modelo fue adaptado para su uso en vigas simplemente apoyadas con ciertas particularidades, como fibras de acero en la mezcla de hormigón o la utilización de hormigón de auto consolidación (Galleguillos, 2010 y Gotschlich, 2011 respectivamente). El modelo de interacción corte-flexión fue adaptado para simular vigas de hormigón armado en cantiléver con una abertura rectangular en la dirección transversal horizontal al centro de su luz. El objetivo era el de validar el modelo para su uso en elementos de esta naturaleza, que son comunes en edificios modernos, en donde se busca aprovechar la altura completa de pisos. Las aberturas se utilizan para el paso de conductos y tuberías. Los resultados obtenidos mediante el modelo de interacción fueron comparados con resultados experimentales, descritos por Lemnitzer et al. (2013). La respuesta global predicha se acerca considerablemente a la respuesta experimental, mostrando curvas de carga desplazamiento razonables. Las limitaciones del modelo fueron evidentes al estimar la zona de falla del Espécimen 1, que presenta daño en su abertura. Otras discrepancias son la alta ductilidad que entrega el modelo analítico, retrasando la degradación por la contribución de corte, así como la alta rigidez inicial que presentan las simulaciones. La acumulación de daño por corte en ciertas zonas fue bien capturada mediante el modelo para los tres especímenes que fallaron en su interfaz con el bloque de reacción, pero no así la acumulación de daño por flexión. La máxima capacidad de los especímenes fue bien predicha, con discrepancias iguales o menores a un 10%. Una variación en la discretización inicial de las vigas junto a una baja en las resistencias de los elementos en el modelo permite inducir la falla en la zona de la abertura. Esta última discretización es recomendada para estudios a futuro.
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Charonko, John James. "Studies of Stented Arteries and Left Ventricular Diastolic Dysfunction Using Experimental and Clinical Analysis with Data Augmentation." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26875.
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Cardiovascular diseases are among the leading causes of deaths worldwide, but the fluid mechanics of many of these conditions and the devices used to treat them are only partially understood. This goal of this dissertation was to develop new experimental techniques that would enable translational research into two of these conditions. The first set of experiments examined in-vitro the changes in Wall Shear Stress (WSS) and Oscillatory Shear Index (OSI) caused by the implantation of coronary stents into the arteries of the heart using Particle Image Velocimetry. These experiments featured one-to-one scaling, commercial stents, and realistic flow and pressure waveforms, and are believed to be the most physiologically accurate stent experiments to date. This work revealed distinct differences in WSS and OSI between the different stent designs tested, and showed that changes in implantation configuration also affected these hemodynamic parameters. Also, the production of vortices near the stent struts during flow reversal was noted, and an inverse correlation between WSS and OSI was described.
The second set of experiments investigated Left Ventricular Diastolic Dysfunction (LVDD) using phase contrast magnetic resonance imaging (pcMRI). Using this technique, ten patients with and without LVDD were scanned and a 2D portrait of blood flow through their heart was obtained. To augment this data, pressure fields were calculated from the velocity data using an omni-directional pressure integration scheme coupled with a proper-orthogonal decomposition-based smoothing. This technique was selected from a variety of methods from the literature based on an extensive error analysis and comparison. With this coupled information, it was observed that healthy patients exhibited different flow patterns than diseased patients, and had stronger pressure differences during early filling. In particular, the ratio of early filling pressure to late filling pressure was a statistically significant predictor of diastolic dysfunction. Based on these observations, a novel hypothesis was presented that related the motion of the heart walls to the observed flow patterns and pressure gradients, which may explain the differences observed clinically between healthy and diseased patients.Ph. D.
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Williams, Vincent Troy. "An Experimental Study of Distance Sensitivity Oracles." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3697.
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The paper \A Nearly Optimal Oracle for Avoiding Failed Vertices and Edges" by
Aaron Bernstein and David Karger lays out a nearly optimal algorithm for nding the
shortest distances and paths between vertices with any given single failure in constant
time without reconstructing the oracle. Using their paper as a guideline, we have
implemented their algorithm in C++ and recorded each step in this thesis. Each step
has its own pseudo-code and its own analysis to prove that the entire oracle construction
stays within the stated running time and total space bounds, from the authors. The
effciency of the algorithm is compared against that of the brute-force methods total
running time and total space needed. Using multiple test cases with an increasing
number of vertices and edges, we have experimentally validated that their algorithm
holds true to their statements of space, running time, and query time.
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Foerster, Andrew T. "Bayesian Analysis, Endogenous Data,and Convergence of Beliefs." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/1477.
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Problems in statistical analysis, economics, and many other disciplines often involve a trade-off between rewards and additional information that could yield higher future rewards. This thesis investigates such a trade-off, using a class of problems known as bandit problems. In these problems, a reward-seeking agent makes decisions based upon his beliefs about a parameter that controls rewards. While some choices may generate higher short-term rewards, other choices may provide information that allows the agent to learn about the parameter, thereby potentially increasing future rewards. Learning occurs if the agent's subjective beliefs about the parameter converge over time to the parameter's true value. However, depending upon the environment, learning may or may not be optimal, as in the end, the agent cares about maximizing rewards and not necessarily learning the true value of the underlying parameter.
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Peterle, Emmanuel. "Gender differences and discrimination in the labor market : experimental and econometric analysis." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1G011/document.
Full textAbstract:
Malgré une amélioration significative de la place des femmes sur le marché du travail depuis les années 60, des inégalités femmes-hommes en termes de salaire et de position dans l’emploi subsistent toujours. Dans cette thèse, nous utilisons à la fois des données d’enquête et des données expérimentales afin d’étudier ce problème. Nous réalisons tout d’abord une étude empirique sur données d’enquête afin d’identifier les déterminants structurels de ces différences femmes-hommes. Nos résultats indiquent qu’une part significative de ces inégalités ne peut être expliquée par des écarts en termes de caractéristiques observables. Nous faisons ensuite appel à l’économie expérimentale afin d’explorer deux facteurs potentiels de cet écart résiduel : la discrimination et les différences femmes-hommes en termes de préférences. Nous nous intéressons à la discrimination en réalisant une première expérience contrôlée en laboratoire. Nous observons une discrimination à l’embauche à l’encontre des femmes dans un cadre d’information imparfaite. Cette discrimination semble provenir du manque d’information à disposition de l’employeur, plutôt que de ses préférences. Dans une seconde expérience en laboratoire, nous mettons en avant les différences entre femmes et hommes en termes d’attitude face à la compétition. Nos résultats suggèrent que les femmes sont moins enclines à entrer en compétition, notamment car elles ont moins confiance en leurs aptitudes que les hommes. Si la discrimination est un facteur potentiel des inégalités femmes-hommes sur le marché du travail, nous montrons dans ces travaux que les différences en termes de préférences sont aussi à considérerDespite a substantial evolution in the participation of women in the labor market since the 60s, there still subsist significant gender inequalities in earnings and occupations. In this dissertation, we use both survey and experimental data to address this issue. We first undertake an empirical study using survey data to isolate the structural determinants of these gender differences. Our findings indicate that a significant part of these inequalities could not be explained by gender differences in observed characteristics. Then, we appeal to experimental economics in order to explore two potential factors of this residual gap: employer discrimination and gender differences in preferences. We first implement a controlled experiment in laboratory to address the issue of discrimination. We find evidence of hiring discrimination against women when information is imperfect. This discrimination seems to arise from the lack of information available to the employer, rather than from her preferences. In a second laboratory experiment, we shed light on gender differences in attitude toward competition. Our results suggest that women are less inclined to enter competition, especially since they are less self-confident than men. Although discrimination consists in a potential factor of gender inequalities in the labor market, we show in this dissertation that gender differences in preferences have also to be considered