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Weber, John Baltzer. « Spread spectrum signal characteristic estimation using exponential averaging and an ad-hoc chip rate estimator ». Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion.exe/07Mar%5FWeber%5FPhD.pdf.
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Dissertation (Ph.D. in Electrical Engineering)--Naval Postgraduate School, March 2007.Dissertation Advisor(s): Clark Robertson. "March 2007." Includes bibliographical references (p. 125-130). Also available in print.
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Herath, Dushanthi N. « Nonparametric Estimation of Receiver Operating Characteristic Surfaces Via Bernstein Polynomials ». Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177212/.
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Receiver operating characteristic (ROC) analysis is one of the most widely used methods in evaluating the accuracy of a classification method. It is used in many areas of decision making such as radiology, cardiology, machine learning as well as many other areas of medical sciences. The dissertation proposes a novel nonparametric estimation method of the ROC surface for the three-class classification problem via Bernstein polynomials. The proposed ROC surface estimator is shown to be uniformly consistent for estimating the true ROC surface. In addition, it is shown that the map from which the proposed estimator is constructed is Hadamard differentiable. The proposed ROC surface estimator is also demonstrated to lead to the explicit expression for the estimated volume under the ROC surface . Moreover, the exact mean squared error of the volume estimator is derived and some related results for the mean integrated squared error are also obtained. To assess the performance and accuracy of the proposed ROC and volume estimators, Monte-Carlo simulations are conducted. Finally, the method is applied to the analysis of two real data sets.
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Esterhuizen, Gerhard. « Generalised density function estimation using moments and the characteristic function ». Thesis, Link to the online version, 2003. http://hdl.handle.net/10019.1/1001.
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BORGSTROM, MARK CRAIG. « ESTIMATION OF RECEIVER OPERATING CHARACTERISTIC (ROC) CURVE PARAMETERS : SMALL SAMPLE PROPERTIES OF ESTIMATORS ». Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184127.
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When studying detection systems, parameters associated with the Receiver Operating Characteristic (ROC) curve are often estimated to assess system performance. In some applied settings it is often not possible to test the detection system with large numbers of stimuli. The resulting small sample statistics many have undesirable properties. The characteristics of these small sample ROC estimators were examined in a Monte Carlo simulation. Three popular ROC parameters were chosen for study. One of the parameters was a single parameter index of system performance, Area under the ROC curve. The other parameters, ROC intercept and slope, were considered as a pair. ROC intercept and slope were varied along with sample size and points on the certainty rating scale to form a four way factorial design. Several types of estimators were examined. For the parameter, Area under the curve, Maximum Likelihood (ML), three types of Least Squares (LS), and Distribution Free (DF) estimators were considered. Except for the DF estimator, the same estimators were considered for the parameters, intercept and slope. These estimators were compared with respect to three characteristics: bias, efficiency, and consistency. For Area under the curve, the ML estimator was the least biased. The DF estimator was the most efficient, and all the estimators except the DF estimator appeared to be consistent. For intercept and slope the LS estimator that minimized vertical error of the points from the ROC curve (line) was the least biased for both estimators. This LS estimator was also the most efficient. This estimator along with the ML estimator also appeared to be the most consistent. The other two estimators had no significant trend toward consistency. These results along with other findings, illustrate that different estimators may be "best" for different sample sizes and for different parameters. Therefore, researchers should carefully consider the characteristics of ROC estimators before using them as indices of system performance.
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Buhr, Dianne C. « Variability in the estimation of item option characteristic curves for the multiple-category scoring model ». Gainesville, FL, 1989. http://www.archive.org/details/variabilityinest00buhr.
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Tseng, Hsin-Wu, Jiahua Fan et Matthew A. Kupinski. « Assessing computed tomography image quality for combined detection and estimation tasks ». SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2017. http://hdl.handle.net/10150/626451.
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Maintaining or even improving image quality while lowering patient dose is always the desire in clinical computed tomography (CT) imaging. Iterative reconstruction (IR) algorithms have been designed to allow for a reduced dose while maintaining or even improving an image. However, we have previously shown that the dose-saving capabilities allowed with IR are different for different clinical tasks. The channelized scanning linear observer (CSLO) was applied to study clinical tasks that combine detection and estimation when assessing CT image data. The purpose of this work is to illustrate the importance of task complexity when assessing dose savings and to move toward more realistic tasks when performing these types of studies. Human-observer validation of these methods will take place in a future publication. Low-contrast objects embedded in body-size phantoms were imaged multiple times and reconstructed by filtered back projection (FBP) and an IR algorithm. The task was to detect, localize, and estimate the size and contrast of low-contrast objects in the phantom. Independent signal-present and signal-absent regions of interest cropped from images were channelized by the dense-difference of Gauss channels for CSLO training and testing. Estimation receiver operating characteristic (EROC) curves and the areas under EROC curves (EAUC) were calculated by CSLO as the figure of merit. The one-shot method was used to compute the variance of the EAUC values. Results suggest that the IR algorithm studied in this work could efficiently reduce the dose by similar to 50% while maintaining an image quality comparable to conventional FBP reconstruction warranting further investigation using real patient data. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Petzschner, Frederike Hermi [Verfasser], et Stefan [Akademischer Betreuer] Glasauer. « Magnitude estimation in humans : a bayesian approach to characteristic behavior in path integration / Frederike Hermi Petzschner. Betreuer : Stefan Glasauer ». München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1033752088/34.
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Ahmadiyan, Sara, et Daniel Mehari. « Estimation of the characteristic in-situ compressive strength class of concrete structures - A case study of the Skuru bridge ». Thesis, KTH, Bro- och stålbyggnad, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-296706.
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It is inevitable that Structures become older and their intended use changes or the structuralcodes regulations change. In some regions the damage from seismic activities is a possibility.It becomes, therefore crucial to assess the structural capacity of such structures. The purposeof this study is to assess the different methods used for testing and estimating thecharacteristic in-situ compressive strength which is the most vital parameter required instructural assessment. The focus of the study is for existing structures where there is no prior knowledge about theconcrete strength. This study first investigates and evaluates the merits and demerits of thesemethods for investigation of the condition of in-situ compressive strength of concrete inexisting structures. A case study of the Skuru bridge that was built in 1914 was utilized forthis study. The study is based on information of the construction data and some results fromprior investigation performed by the company COWI. Afterwards, non-destructive tests werecarried out with the UPV and Rebound hammer to assess the quality of the concrete. In addition, the study assesses the use of different interpretation methods with regards toreliability and practical application. The results were interpreted in accordance to theEuropean codes, Swedish codes and other interpretation methods. The difference of theresults from the different interpretation methods are compared and evaluated for reliabilityand efficiency. The test results confirmed that the concrete consisted of the same strength class. However,the results from the different interpretation methods are dissimilar. The reason for obtainingdifferent results is because the methods depend on different methodologies. The studyshowed that some methods can sometimes overestimate the results and become unsafe forstructural assessment. On the contrary, the other methods can yield lower but safer estimates. Moreover, the use of small number of cores is evaluated for various methods. The reasons arebecause in practice, the preference is to avoid large number of cores. As a result, it isrecommended to apply care and proper judgment in selection of the methods andinterpretation of the results. It is also recommended to consider the methods with respect tothe aim of the investigation, their limitations and assumptions.Samtida befintliga konstruktioner blir äldre och de dimensionerade lasterna ökar med tiden.Ifatt med detta ändras även kraven för större laster. Därför bör regelbundna inspektioner ochförbättringar genomföras. I vissa områden kan det även förekomma seismiska rörelser som isin tur förorsakar skador på strukturer. Av bland annat dessa anledningar är det därför viktigtatt bedöma bärförmågan för befintliga konstruktioner. Syftet med arbetet är att granska demetoder och tillvägagångssätt som finns för att kunna bedöma den karaktäristiskatryckhållfastheten för betong i befintliga konstruktioner. Tryckhållfastheten är den styrandeparametern för materialet under tillståndsbedömningar. Huvudfokuset med arbetet är att bedöma den karaktäristiska tryckhållfastheten för befintligakonstruktioner som saknar information om nuvarande tryckhållfasthet. Till en början utfördesen noggrann litteraturstudie för alla applicerbara metoder. Därefter gjordes en undersökningoch bedömning av för- och nackdelar med vardera metod. Syftet med dessa metoder är attkunna mäta den nuvarande tryckhållfastheten för befintliga konstruktioner. Efter en ingående litteraturstudie, valdes de icke-destruktiva metoderna Ultrasonic pulsevelocity och Schmidt Hammer. Dessa metoder applicerades senare på Skuru bron i syfte attutföra icke-destruktiva tester för att bedöma betongens kvalitet. Tidigarekonstruktionshandlingar samt provtagningsrapporter från Skurubron som byggdes år 1914,har legat till grund för detta arbete. Företaget COWI är ansvariga för Skurubron projektet ochhar tillhandahållit all information om bron. Vidare, redovisar detta arbete olika beräkningssätt för samtliga metoder utifrån olikastandarder och tolkningsmetoder. För varje tolkningsmetod har evalueringar och analyserutförts med avseende på tillförlitlighet och praktisk tillämpning. De redovisadeberäkningssätten har använts för att räkna fram resultat från destruktiva och icke-destruktivatester. Resultaten tolkades i enlighet med europeiska koder, svenska koder och andratolkningsmetoder. Skillnaden mellan resultaten från samtliga tolkningsmetoder jämförs ochutvärderas med hänsyn till tillförlitlighet och effektivitet. Testresultaten från UPV och Schmidt Hammer bekräftade att betongen består av sammatryckhållfasthetsklass. Resultaten från de olika tolkningsmetoderna var dock olika.Anledningen till att det blev olika resultat beror på att varje tolkningsmetod utgörs av sinaegna metodiska procedurer. Resultaten visade även att vissa standarder kan övervärderaresultaten vilket kan resultera i fel bedömning av den karaktäristiska tryckhållfastheten. Åandra sidan, resulterade vissa tolkningsmetoder i lägre men säkrare uppskattning avtryckhållfastheten. Utöver detta, utfördes det beräkningar på de destruktiva testerna utifrån olikatolkningsmetoder. Beräkningarna baserades dels på att räkna på ett mindre antal kärnor.Skälet till detta är att man i praktiken vill undvika att borra ett stort antal kärnor. Resultatenvisade att korrekt bedömning och försiktighet vid val av metod och tolkningsmetod behöverimplementeras. Det rekommenderas även att överväga metoderna med hänsyn tillutredningens ändamål, dess begränsningar och antaganden.
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Roshani, Pedram. « The Effect of Temperature on the SWCC and Estimation of the SWCC from Moisture Profile under a Controlled Thermal Gradient ». Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31072.
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In many situations, the upper layers of soil above the ground water table are in a state of unsaturated condition. Although unsaturated soils are found throughout the world, they are predominant in arid or semi-arid regions. In these areas, the soil water characteristic curve (SWCC) which relates the water content to the matric suction could be used as key tool to implement the mechanics of unsaturated soils into the designs of geotechnical structures such as dams, embankments, pavements, canals, and foundations.
Several experimental techniques are available for determining the SWCC in a laboratory environment. However, these experimental techniques are expensive, time consuming typically requiring days or weeks, depending on the soil type, and demanding intricate testing equipment. Due to these reasons, there has been a growing interest to find other means for estimating SWCC and encourage the adoption of unsaturated soils mechanics in geotechnical engineering practice.
Several methods exist to indirectly estimate the SWCC from basic soil properties. Some may include statistical estimation of the water content at selected matric suction values, correlation of soil properties with the fitting parameters of an analytical equation that represents the SWCC, estimation of the SWCC using a physics-based conceptual model, and artificial intelligence methods such as neural networks or genetic programming.
However, many studies have shown that environmental effects such as temperature, soil structure, initial water content, void ratio, stress history, compaction method, etc. can also affect the SWCC. This means that the estimation SWCC from set of conditions may not reliably predict the SWCC in other conditions. Due to this reason, it is crucial for engineers involved with unsaturated soils to take into account all the factors that influence the SWCC.
The two key objectives of the present thesis are the development of a method based on first principles, using the capillary rise theory, to predict the variation of the SWCC as a function of temperature, as well as developing a technique for the prediction of the fixed parameters of a well-known function representing the SWCC based on basic soil properties together with the moisture profile of a soil column subjected to a known temperature gradient.
A rational approach using capillary rise theory and the effect of temperature on surface tension and liquid density is developed to study the relation between temperature and the parameters of the Fredlund and Xing (1994) equation. Several tests, using a Tempe cell submerged in a controlled temperature bath, were performed to determine the SWCC of two coarse-grained soils at different temperatures. A good comparison between the predicted SWCC at different temperatures using the proposed model and the measured values from the Tempe cell test results is achieved.
Within the scope of this thesis, a separate testing program was undertaken to indirectly estimate the SWCC of the same two coarse-grained soils from the measurement of their steady state soil-moisture profile while subjected to a fixed temperature differences. The water potential equation in the liquid and vapor phases is used to analyses the steady state flow conditions in the unsaturated soil. A good comparison is obtained for the SWCC estimated using this technique with the SWCC measured used a Tempe cell submerged in a controlled temperature bath.
The results of this study indicate that knowledge of the moisture content of a soil specimen under a constant thermal gradient and basic soil properties can be used to estimate the SWCC of the soil at the desired temperature.
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Taparugssanagorn, A. (Attaphongse). « Evaluation of MIMO radio channel characteristics from TDM-switched MIMO channel sounding ». Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514286506.
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Abstract
The present dissertation deals with the evaluation of multiple-input multiple-output (MIMO) radio channel characteristics from time-division multiplexing (TDM)-switched MIMO channel sounding. The research can be divided into three main areas. First, the impacts of phase noise in TDM-switched MIMO channel sounding on channel capacity are studied. Second, we focus on those impacts on channel parameter estimation using the SAGE algorithm. And in the last part, spatial correlation, channel eigenvalue distribution, and ergodic capacity in realistic environments are analyzed.
The rationale behind the first two areas is that most advanced MIMO radio channel sounders employ the TDM technique, which has significant problems from phase noise of the TX and RX phase locked loop (PLL) oscillators causing measurement errors in terms of estimated channel capacity and parameters. We propose statistical models that reproduce the capacity estimates. The effects of the sounding mode (SM), the length of pseudo-random noise (PN) sequence L of the sounding signal, and the system size are disclosed. The distinctive basis is to consider the impact of the actual phase noise in TDM switched MIMO channel sounding, instead of assuming white Gaussian-type phase noise. In a reality, the short-term phase noise component affecting one measurement cycle of a MIMO system plays an important role in the traditional estimators of the radio channel parameters and capacity. We show that the performance impairment is less than that been under the hypothesis of uncorrelated white Gaussian phase-noises samples. The difference is due to the non-vanishing correlation of phase-noise within the measurement cycle. Two approaches to mitigating the impact of phase noise are proposed. The former is the simple and efficient sliding averaging method, where the signal-to-noise ratio (SNR) of the channel impulse response can be increased. The latter is the choice of SM and L, which is more thorough. In the second part, two approaches to mitigating its impact on channel parameter estimation using the SAGE algorithm are also discussed. Besides the sliding averaging, which in general can increase the SNR, the new SAGE algorithm based channel parameter estimation based on the improved signal model accounting for the phase noise in the measurement device is proposed. Finally, the channel eigenvalue distribution and ergodic capacity based on complex hypergeometric functions and their asymptotic characteristics are analyzed. It is shown that the derived theoretical expressions closely approximate the simulated results of the measured finite-dimensional MIMO channels. The spatial correlation and the eigenvalue statistics in frequency selective channels for single and dual polarized antennas are investigated. This knowledge is useful when different MIMO and beamforming techniques are applied.
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Ozcan, Berkay. « The effects of marital transitions and spousal characteristic on economic outcomes ». Doctoral thesis, Universitat Pompeu Fabra, 2008. http://hdl.handle.net/10803/7251.
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My dissertation aims to improve our understanding of why and how couple dynamics and marital transitions affect four critical economic outcomes: household savings, labour supply, transition to self-employment and income distribution. In all of my papers, behavior of the couple is at the center. First chapter analayzes the likelihood of starting a business and examines at the influence of marriage, its duration and the characteristics of the spouse on the probability to make a transition to entrepreneurship. In the second chapter, I take advantage of Irish Divorce Law introduced in 1996 as quasi-natural experiment for the rise in the risk of divorce and explain its effects on household savings behavior. The third chapterturns its attention to labour supply behaviour of the men on women experiencing a risk in the marital stability. Similarly, the last paper is also concerned about entry and exits from marriage, but it considers these phenomena together with the rise in female employment. Consequently, this chapter sheds light to the mechanisms through which changes in family types and labor supply decisions of women are actually leading to higher or lower inequality. Generally, my dissertation covers both substantive and methodological issues on several fields from inequality research to family demographics and entrepreneurship.Esta tesis tiene el objetivo de ampliar y perfeccionar nuestra comprensión de por qué y cómo la dinámica de pareja afecta cuatro críticos resultados económicos que están directamente realacionados con la desigualdad y la estratificación. Estos resultados son, respectivamente; ser autónomo, la oferta de trabajo, el ahorro de los hogares y la distribución del ingreso. A lo largo de la tesis, con la dinámica de pareja, concibo dos conceptos: en primer lugar implica formar parte de una pareja (es decir, tener una esposa/o con ciertas características) versus ser soltero/a y transiciones entre estos dos estados. Y la segunda se refiere a los cambios en el comportamiento de los esposos debido a un cambio de contexto, como un aumento en el riesgo de disolución de la pareja. Por consiguiente, analiza las implicaciones de estos dos conceptos en cada una de estas variables económicas. La tesis se utiliza una serie de grandes conjuntos de datos longitudinales de diferentes países (p.e. PSID, GSOEP, PHCE, Living in Ireland Survey) y estratégias econométricas. Estas características incluyen el análisis de supervivencia, las estimaciones de diff-en-diff, simulaciones y descomposiciones.
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Ishrat, Tajrin. « Slip control for trains using induction motor drive ». Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/199908/1/Tajrin_Ishrat_Thesis.pdf.
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This research is a railway industry related project, which is concerned with finding improvements in railway traction and wheel slip control in electric drives. A new approach was developed to detect the unknown and immeasurable rail surface. And a novel identification scheme was used to identify the best operating friction level. A new switching controller was operated by the induction motor controller under all possible train operating conditions. Aspects of the study were validated in the laboratory experiment. By exploring the in-rail track condition detection, the best drive torque and desired slip in the railway field were identified.
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Pospíšil, Lukáš. « Analýza ROC křivek zvukových signálů a jejich srovnání ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316445.
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This thesis deals with oportunity of ROC curve usage in the description of methods that work with sound signals. Specifically, it focuses on ways of detecting of stress in speech signals. The detection itselfs is done in a range of frequencies of the sound signal. There is also a classifier designed using ROC curves that decides whether the input signal is stressed or not. The output of this thesis are findings gathered from analyses and also some recommendation based on those analyses.
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ARAÚJO, Raphaela Lima Belchior de. « Família composta Poisson-Truncada : propriedades e aplicações ». Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16315.
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Este trabalho analisa propriedades da família de distribuições de probabilidade Composta N e propõe a sub-família Composta Poisson-Truncada como um meio de compor distribuições de probabilidade. Suas propriedades foram estudadas e uma nova distribuição foi investigada: a distribuição Composta Poisson-Truncada Normal. Esta distribuição possui três parâmetros e tem uma flexibilidade para modelar dados multimodais. Demonstramos que sua densidade é dada por uma mistura infinita de densidades normais em que os pesos são dados pela função de massa de probabilidade da Poisson-Truncada. Dentre as propriedades exploradas desta distribuição estão a função característica e expressões para o cálculo dos momentos. Foram analisados três métodos de estimação para os parâmetros da distribuição Composta Poisson-Truncada Normal, sendo eles, o método dos momentos, o da função característica empírica (FCE) e o método de máxima verossimilhança (MV) via algoritmo EM. Simulações comparando estes três métodos foram realizadas e, por fim, para ilustrar o potencial da distribuição proposta, resultados numéricos com modelagem de dados reais são apresentados.
This work analyzes properties of the Compound N family of probability distributions and proposes the sub-family Compound Poisson-Truncated as a means of composing probability distributions. Its properties were studied and a new distribution was investigated: the Compound Poisson-Truncated Normal distribution. This distribution has three parameters and has the flexibility to model multimodal data. We demonstrated that its density is given by an infinite mixture of normal densities where in the weights are given by the Poisson-Truncated probability mass function. Among the explored properties of this distribution are the characteristic function end expressions for the calculation of moments. Three estimation methods were analyzed for the parameters of the Compound Poisson-Truncated Normal distribution, namely, the method of moments, the empirical characteristic function (ECF) and the method of maximum likelihood (ML) by EM algorithm. Simulations comparing these three methods were performed and, finally, to illustrate the potential of the proposed distribution numerical results with real data modeling are presented.
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Shiga, Yoshinori. « Precise estimation of vocal tract and voice source characteristics ». Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/940.
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This thesis addresses the problem of quality degradation in speech produced by parameter-based speech synthesis, within the framework of an articulatory-acoustic forward mapping. I first investigate current problems in speech parameterisation, and point out the fact that conventional parameterisation inaccurately extracts the vocal tract response due to interference from the harmonic structure of voiced speech. To overcome this problem, I introduce a method for estimating filter responses more precisely from periodic signals. The method achieves such estimation in the frequency domain by approximating all the harmonics observed in several frames based on a least squares criterion. It is shown that the proposed method is capable of estimating the response more accurately than widely-used frame-by-frame parameterisation, for simulations using synthetic speech and for an articulatory-acoustic mapping using actual speech. I also deal with the source-filter separation problem and independent control of the voice source characteristic during speech synthesis. I propose a statistical approach to separating out the vocal-tract filter response from the voice source characteristic using a large articulatory database. The approach realises such separation for voiced speech using an iterative approximation procedure under the assumption that the speech production process is a linear system composed of a voice source and a vocal-tract filter, and that each of the components is controlled independently by different sets of factors. Experimental results show that controlling the source characteristic greatly improves the accuracy of the articulatory-acoustic mapping, and that the spectral variation of the source characteristic is evidently influenced by the fundamental frequency or the power of speech. The thesis provides more accurate acoustical approximation of the vocal tract response, which will be beneficial in a wide range of speech technologies, and lays the groundwork in speech science for a new type of corpus-based statistical solution to the source-filter separation problem.
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Spiess, Malte [Verfasser]. « Characteristics of Poisson cylinder processes and their estimation / Malte Spiess ». Ulm : Universität Ulm. Fakultät für Mathematik und Wirtschaftswissenschaften, 2012. http://d-nb.info/1024534057/34.
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Park, Junhyeok, et Junhyeok Park. « Estimation of Rock Comminution Characteristics by Using Drill Penetration Rates ». Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/621838.
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The characterization of rock properties is a vital task in the challenge for hard rock mining operation. A simplified and straightforward characterization of rock properties provides information about the safety of ground structure (e.g. slope, tunnel, etc.), and the strategy to improve productivity in terms of rock breakage process. The penetration-rate of drilling has been proposed to quantify the comminution characteristics of rock by virtue of real-time logging of drilling performance otherwise the data is obtained from a time- and cost-consuming laboratory test; this is called measurement while drilling. In the mining industry, this technique can be a useful tool that has allowed for the meticulous and routine data collection of geological information from blasthole drilling operations. In this study, the mechanical performance of drill and its interaction with the rock properties is investigated in laboratory scale. The rock properties include tensile strength, hardness, and grindability, which is considered as the influential parameters of the required energy consumption for the comminution processes. For sandstone samples, the penetration-rate data shows a good correlation with tensile strength, hardness, and Bond work index; this implies that penetration-rate data can be a good indicator to estimate comminution characteristics. Additionally we carried out the same test with limestone samples. Second, field study is conducted to investigate the interaction between current blast design and rock fragmentation. Fabricating the blast design and fragmentation through the blast operation might enable to construct proper strategy to reduce the energy cost of downstream processes including crushing and grinding by using the rock characteristics measured from the blasthole drilling. The concept of this process is a part of Mine-to-Mill optimization. The thesis proposed the blueprint of Mine-to-Mill optimization, providing a guideline for further in-situ research.
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Khalili, Mata. « Estimation of human characteristics for controlling a robotic walking aid ». Versailles-St Quentin en Yvelines, 2014. http://www.theses.fr/2014VERS0044.
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Cette thèse vise à spécifier un système d’assistance basé sur la coopération des modules robotisés distribués dans l’environnement. Elle se caractérise par une adaptation aux besoins des utilisateurs en fonction de leurs capacités physiques. Nous avons proposé une architecture générique pour spécifier le système d’assistance ambiante pouvant être déployé dans l’espace public. Par ailleurs, nous avons proposé des méthodes d’ajustement et d’adaptation pour les ressources d’assistance robotisées. Ces méthodes sont basées sur la détection à distance et de l'estimation automatique. Les tests expérimentaux réalisés avec des personnes à mobilité réduite, dans cette thèse, portent sur l’aide à la marche par l’usage d’un déambulateur robotisé. Deux études ont permis de valider ce travail : identification à distance de caractéristiques physiques des utilisateurs, estimation des caractéristiques sur les utilisateurs lors de l’interaction homme-machine avec le déambulateurThis thesis aims to specify an assistance system based on the cooperation of the distributed robotic devices in the environment. It is characterized by adaptation to users' needs according to their physical abilities, their profile and their situation. It also relies on the collaboration between the assistive devices and the environment. We proposed a generic architecture to specify an ambient assistance system that can be deployed in the public spaces. In addition, we have proposed the methods of adjustment and adaptation of the robotic assistive devices. These methods are based on the remote sensing and automatic estimation. The experimental tests performed in this thesis are focused on the ambulation aid system for people with reduced mobility. Two studies with persons with reduced mobility have validated this work: the remote identification of physical characteristics of users, real time estimation of user's capacity of ambulation through the interaction with the walker
19
Chen, Liping. « Soil Characteristics Estimation and Its Application in Water Balance Dynamics ». Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc9789/.
Texte intégralRésumé :
This thesis is a contribution to the work of the Texas Environmental Observatory (TEO), which provides environmental information from the Greenbelt Corridor (GBC) of the Elm Fork of the Trinity River. The motivation of this research is to analyze the short-term water dynamic of soil in response to the substantial rainfall events that occurred in North Texas in 2007. Data collected during that year by a TEO soil and weather station located at the GBC includes precipitation, and soil moisture levels at various depths. In addition to these field measurements there is soil texture data obtained from lab experiments. By comparing existing water dynamic models, water balance equations were selected for the study as they reflect the water movement of the soil without complicated interrelation between parameters. Estimations of water flow between soil layers, infiltration rate, runoff, evapotranspiration, water potential, hydraulic conductivity, and field capacity are all obtained by direct and indirect methods. The response of the soil at field scale to rainfall event is interpreted in form of flow and change of soil moisture at each layer. Additionally, the analysis demonstrates that the accuracy of soil characteristic measurement is the main factor that effect physical description. Suggestions for model improvement are proposed. With the implementation of similar measurements over a watershed area, this study would help the understanding of basin-scale rainfall-runoff modeling.
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Chen, Liping Acevedo Miguel Felipe. « Soil characteristics estimation and its application in water balance dynamics ». [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-9789.
Texte intégral
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Filostrat, John E. « Estimation of Sediment Resuspension and Deposition in Coastal Waters ». ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1796.
Texte intégralRésumé :
The Louisiana Gulf Coast is a dynamic system of heavy influence on the cultures that live and prosper around it. Land in this area is in jeopardy of being lost. In 2017, the Coastal Protection and Restoration agency will issue a new State Master and this thesis provides a more intricate way of numerically predicting the behaviors of associated sediments. A model for the estimation of resuspension and deposition is proposed and prepared for integration into the existing model. The silt and clay fractions of the bed sediment and the sediment inflow were modeled by the widely used hydrodynamic models of Delft3D and ECOMSED, using the Young and Verhagen wave properties to obtain orbital velocities and bed shear stress. The critical shear stress for erosion was based on empirical formulas developed by van Rijn.
22
Ngai, Christopher. « Estimating the demand structure of housing characteristics : a nonparametric approach ». Oberlin College Honors Theses / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1342186655.
Texte intégral
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Vasudeva, Sumit. « Estimation of Elastic and Damping Characteristics of Viscoelastically Constrained Carbon Strands ». Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36467.
Texte intégralRésumé :
Traditional large space structure construction incorporates the use of lightweight tubular metal alloys that have good strength to weight and stiffness to weight ratio. Recently, however, space structure construction has shifted focus on materials that are ultra lightweight, have high strength, have low package volume and possess excellent damping characteristics. Substantial damping is required in space since there is no surrounding medium to provide damping. Such a construction uses composites in a fabric form that displays viscoelastic behavior. The viscoelastic behavior is attributed to energy dissipation because of the shear stresses between the various fibrous strands that are kept in place by constraining viscoelastic layers. This type of vibration control falls under the rubric of passive damping of structures and has been found to have certain advantages over active damping such as less complexity as it does not require sensors, actuators and power supply that are needed for active damping.
One such material consists of woven carbon strands constrained by layers of viscoelastic damping material. Dynamics and buckling behavior of a structure in the form of a tube made from this material with metallic end caps is modeled and analyzed using commercially available Finite Element Analysis code ABAQUS®. The current analysis deals with the non-pressurized tube since the structure can maintain the tubular configuration as well as support end caps on account of the stiffness provided by the composites. Since no simple analytical approaches are available to predict damping of these materials, experimental data was used to estimate the damping characteristics of the material. The mass of the end cap was also estimated from the experimental impulse response as exact mass of the end cap (that was rigidly fixed to the tube) was unknown.
Master of Science
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Johnson, Carey Kell. « Estimating values of a quality characteristic after product conversion ». Online version, 1999. http://www.uwstout.edu/lib/thesis/1999/1999johnsonc.pdf.
Texte intégral
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Acreman, Michael Charles. « Estimating flood statistics from basin characteristics in Scotland ». Thesis, University of St Andrews, 1985. http://hdl.handle.net/10023/2888.
Texte intégralRésumé :
Estimation of the probability of occurrence of future flood events at a site is frequently required for the design of bridges, culverts, dams and other river engineering works. This study considers a method for estimating the flood frequency distribution from the physical characteristics of the drainage basin for use in Scotland when adequate records of river discharge are not available. The data base collated includes 3071 station years of annual maximum flood peaks for 168 high quality gauging stations and 12 physical characteristics for each drainage basin. A linear regression model is derived which explains 91% of the variation in the average magnitude of floods using five physical characteristics indexing drainage area, rainfall, stream density, soil type and lake storage. This model appears robust over the range of basin types and shows no improvement when shrinkage or ridge regression is employed. Five physically homogeneous subsets of basins are derived using a clustering algorithm (NORMIX) and the same five characteristics, with the addition of an index of channel slope. For each of subsets 1, 3, 4 and 5, the individual dimensionless flood frequency distributions for each station are not significantly different from a single GEV distribution derived for that subset. Consequently these subsets are considered to be hydrologically homogeneous in addition to their physical homogeneity. Dimensionless regional flood frequency distributions are produced for each subset which allow the estimated average flood magnitude to be scaled to estimate floods of less frequent occurrence. These regional 'growth curves' imply a larger return period for a given magnitude flood than those from the Natural Environment Research Council Flood Studies Report (NERC, 1975). When the floods are described by a lognormal model which allows for cross-correlation between stations the respective return periods are smaller.
26
Ottosson, Anton, et Viktor Karlstrand. « Gaussian Process Methods for Estimating Radio Channel Characteristics ». Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289449.
Texte intégralRésumé :
Gaussian processes (GPs) as a Bayesian regressionmethod have been around for some time. Since proven advant-ageous for sparse and noisy data, we explore the potential ofGaussian process regression (GPR) as a tool for estimating radiochannel characteristics.Specifically, we consider the estimation of a time-varyingcontinuous transfer function from discrete samples. We introducethe basic theory of GPR, and employ both GPR and its deep-learning counterpart deep Gaussian process regression (DGPR)for estimation. We find that both perform well, even with fewsamples. Additionally, we relate the channel coherence bandwidthto a GPR hyperparameter called length-scale. The results show atendency towards proportionality, suggesting that our approachoffers an alternative way to approximate the coherence band-width.Gaussiska processer (Gaussian processes,GPs) har länge använts för Bayesiansk regression. Då de visat sigfördelaktiga för gles och brusig data utforskar vi möjligheternaför GP-regression (Gaussian process regression, GPR) som ettverktyg för att estimera egenskaper hos radiokanaler.Isynnerhetbetraktasskattningaventidsvarierandeöverföringsfunktion utifrån diskreta samplingar. Vi presenterarden grundläggande teorin kring GPR, och använder både GPRoch dess djupinlärningsmotsvarighet DGPR (deep Gaussian pro-cess regression) för skattning. Båda ger goda resultat, även när samplingarna är få. Utöver detta så relaterar vi koherens-bandbredden hos en radiokanal till en hyperparameter i GPR-modellen. Resultaten visar på en tendens till proportionalitet,vilket antyder att vår metod kan användas som ett alternativt sätt att approximera koherensbandbredden.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
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Szabó, Balázs. « High density EMG based estimation of lower limb muscle characteristics using feature extraction ». Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289859.
Texte intégralRésumé :
Electromyography (EMG) is a common tool in electrical muscle activity measurement and can be used in multiple areas of clinical and biomedical applications, mainly in identifying neuromuscular diseases, analyzing movement or in human machine interfaces. Traditionally a pair of electrodes were used to measure the signals, but in recent years the use of high density surface EMG (HD-sEMG) gained more popularity as it can sample myoelectric activities from multiple electrodes in an array on a single muscle and provide more information. In this thesis a measurement setup and protocol is proposed that can provide a reliably measurement, furthermore multiple features are extracted from the collected signals to characterise the major muscles around the ankle. 5 healthy subjects were tested using an ankle dynamometer with 5 HD-sEMG placed on the Tibialis Anterior, the Gastrocnemius Medialis, the Soleus, the Gastrocnemius Lateralis, and on the Peroneus Longus. Several tests were conducted using different initial angle of the ankle joint and different percentages of the maximum voluntary contraction. The reliability of the setup was assessed by comparing the variance between the collected signals of the same subject in a repeated test, and by comparing different subjects to each other. Results show a reasonably good reliability with less than $10\%$ variance, and adequate selectivity as well. To examine the muscle characteristics, 7 features were extracted from the collected and processed signals, then the features were plotted and compared to signs for muscle characteristics such as muscle fatigue, activation, and spatial distribution of activation. Correlations between features of mean average value (MAV) and zero crossing (ZC), and different muscle characteristics could be observed.
28
Erdem, Munire Tugba. « Modeling Diseases With Multiple Disease Characteristics : Comparison Of Models And Estimation Methods ». Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613531/index.pdf.
Texte intégralRésumé :
Epidemiological data with disease characteristic information can be modelled in several ways. One way is taking each disease characteristic as a response and constructing binary or polytomous logistic regression model. Second way is using a new response which consists of disease subtypes created by cross-classification of disease characteristic levels, and then constructing polytomous logistic regression model. The former may be disadvantageous since any possible covariation between disease characteristics is neglected, whereas the latter can capture that covariation behaviour. However, cross-classifying the characteristic levels increases the number of categories of response, so that dimensionality problem in parameter space may occur in classical polytomous logistic regression model. A two staged polytomous logistic regression model overcomes that dimensionality problem. In this thesis, study is progressen in two main directions: simulation study and data analysis parts. In simulation study, models that capture the covariation behaviour are compared in terms of the response model parameter estimators. That is, performances of the maximum likelihood estimation (MLE) approach to classical polytomous logistic regression, Bayesian estimation approach to classical polytomous logistic regression and pseudo-conditional likelihood (PCL) estimation approach to two stage polytomous logistic regression are compared in terms of bias and variation of estimators. Results of the simulation study revealed that for small sized sample and small number of disease subtypes, PCL outperforms in terms of bias and variance. For medium scaled size of total disease subtypes situation when sample size is small, PCL performs better than MLE, however when the sample size gets larger MLE has better performance in terms of standard errors of estimates. In addition, sampling variance of PCL estimators of two stage model converges to asymptotic variance faster than the ML estimators of classical polytomous logistic regression model. In data analysis, etiologic heterogeneity in breast cancer subtypes of Turkish female cancer patients is investigated, and the superiority of the two stage polytomous logistic regression model over the classical polytomous logistic model with disease subtypes is represented in terms of the interpretation of parameters and convenience in hypothesis testing.
29
Nakagawa, F. « Estimation of the size and characteristics of HIV-positive populations in Europe ». Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1471810/.
Texte intégralRésumé :
HIV remains a key public health issue, despite the introduction of effective antiretroviral therapy (ART) which has led to huge improvements in the prognosis of HIV-positive individuals. In order to be best informed about an HIV epidemic, it is desirable to have estimates to complement data already available from national and international surveillance, not only on the total number of people living with HIV, but which also describe the characteristics of HIV-positive populations such as the number diagnosed, CD4 count and viral load distribution and the cascade of care. The aims of this thesis were to develop a method based on an individual-based progression model of HIV and the effect of ART to reconstruct and hence better understand the HIV-positive population, for use in Europe. Using this model, I first investigated the projected life expectancy of men-who-have-sex-with-men (MSM) according to timing of diagnosis. I then updated the model to incorporate new data after a review of the literature as well as statistical analyses of viral load and CD4 count changes in the absence of ART, based on data from a large pan-European cohort collaboration. Next, I developed a method using data on MSM in the UK, which calibrates the model to observational and surveillance data of HIV from European countries, and then uses the parameter sets which best fit to the observed data to describe the status of their HIV-positive populations. Plausibility ranges are also estimated to reflect the uncertainty regarding any model parameters. The method is also applied to data on MSM in the Netherlands, and for all HIV-positive individuals in Spain and Estonia. The advantages and disadvantages of this approach compared with other existing approaches are considered. To conclude, I reflect on future modelling needs that are particularly relevant to informing public health in Europe.
30
Kim, Yeonsu. « Probabilistic Estimation of River Discharge Considering Channel Characteristics Uncertainty with Particle Filters ». 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180482.
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Yilmaz, Emre. « Algorithms for estimating reverberation characteristics for single channel dereverberation ». Thesis, KTH, Signalbehandling, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168016.
Texte intégralRésumé :
Speech enhancement systems achieving a joint suppression of reverberation and background noise can be used in digital hearing aids, voice controlled systems or hands-free telephony. Demanding requirements for computational complexity, signal delay and speech quality must be fulfilled in order to achieve a satisfactory performance. The speech quality depends on how accurate the reverberation characteristics such as the reverberation time or the spectral variance of the late reverberant speech are estimated. In this thesis, an efficient algorithm for a blind reverberation time estimation based on maximum likelihood approach is introduced. The new algorithm allows to estimate reverberation times from a much wider range with acceptable accuracy. Variance of the late reverberant speech is another important quantity in dereverberation systems. Two late reverberant spectral variance estimation methods are compared with regard to estimation accuracy and computational complexity. Finally, the performance of the considered speech enhancement system is analyzed with the improved reverberation time estimator.
32
Thambidorai, Ganesh. « Multiresponse Optimization Methodology Considering Related Quality Characteristics ». Thesis, North Dakota State University, 2011. https://hdl.handle.net/10365/29174.
Texte intégralRésumé :
Engineering problems often involve many conflicting quality characteristics that must be optimized simultaneously. Engineers are required to select suitable design parameter values which provide better trade-off among all quality characteristics. Multiresponse optimization is one of the most essential tools for solving engineering problems involving multiple quality characteristics. Optimizing several quality characteristics when the quality characteristics are correlated makes the optimization process more complex. The aim of this research is to evaluate the performance of several existing multiresponse
optimization methods and investigate their capabilities in dealing with correlated quality characteristics. This study also investigates the impact of uncertainty in terms of input parameter selection. A new multi-response optimization approach has been proposed for solving correlated quality characteristics. The proposed approach is compared with the existing methods and found more robust in terms dealing with
uncertainty in target selection. The comparative study and application of the proposed approach is demonstrated by considering two examples from the literature having correlated quality characteristics.
33
Rodríguez, Cortés Francisco Javier. « Modelling, Estimation and Applications of Second-Order Spatio-Temporal Characteristics of Point Processes ». Doctoral thesis, Universitat Jaume I, 2014. http://hdl.handle.net/10803/394025.
Texte intégralRésumé :
Esta tesis se centra principalmente en el desarrollo de propiedades y características de los estimadores de segundo orden de procesos puntuales y espacio-temporales. En primer lugar, se presenta un marco teórico acerca de procesos puntuales espaciales y espacio-temporales. El resto de la tesis se organiza como sigue. En el capítulo 2, se presenta una nueva familia de kernel positivos y óptimos, además se propone un estimador insensgado alternativo para la función de la densidad del producto. Su rendimiento se compara para varios kernel mediante MISE. En el capítulo 3, se dada un nuevo estimador kernel de la función de la densidad producto espacio-temporal y también se desarrollan expresiones cerradas para la varianza en el caso de Poisson. En el Capítulo 4, nos centramos en los métodos de orientación de segundo orden los cuales proporcionan una herramienta para el análisis natural para los datos espaciales anisótropicos. Finalmente, se proporciona una descripción general de los proyectos de investigación actualmente en curso que han surgido motivadas por la estrecha relación con las propiedades de segundo orden de los procesos puntuales espaciales y espacio-temporales.This thesis is mainly focused on developing properties and estimators for second-order characteristics of spatio-temporal point processes. First, we present a theoretical framework of spatial and spatio-temporal point processes. The rest of the thesis is organized as follows. In Chapter 2 we present a new family of optimal and positive kernels an alternative unbiased estimator for the product density function. Its performance is compare under several kernel through MISE. In Chapter 3 a new kernel estimator of spatio-temporal product density function are given and also are developed close expressions for the variance under the Poisson case. En el capítulo 4 nos centramos en los métodos de orientación de segundo orden que proporcionan una herramienta natural para el análisis de los datos de proceso Punto espaciales anisótropas. Finally, we provide a general description of the currently ongoing research projects which have emerged motivated by the close relationship with the second-order properties.
34
Ozan, Cem. « Estimation Of Grain Characteristics Of Soils By Using Cone Penetration Test (cpt) Data ». Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1088988/index.pdf.
Texte intégralRésumé :
Due to lack of soil sampling during a conventional cone penetration testing (CPT), it is necessary to classify soils based on recorded tip and sleeve friction and pore pressure (if available) values. However, currently available soil classification models are based on deterministic and judgemental determination of soil classification boundaries which do not address the uncertainties intristic to the problem. Moreover, size and quality of databases used in the development of these soil classification models are undocumented and thus questionable. Similar limitations do also exist in the development of SPT-CPT correlations which are widely used in SPT dominated design such as soil liquefaction triggering. To eliminate these discussed limitations, within the confines of this study it is attempted to present (1) a new probabilistic CPT- based soil classification methodology, and (2) new SPT-CPT correlations which address the uncertainties intrinsic to the problems. For these purposes, a database composed of 400 CPT/SPT boring data pairs was compiled. It is intended to develop probabilistic models, which will correlate CPT tip and sleeve friction values to actual soil classification and CPT tip resistance to SPT blow count N. The new set of correlations, model parameters of which estimated by implementing maximum likelihood methodology, presented herein are judged to represent a robust and defensible basis for (1) prediction of soil type based on CPT data and, (2) estimation of SPT-N value for given CPT data.
35
Yu, Jun. « Empirical characteristics function in time series estimation and a test statistic in financial modelling ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ31169.pdf.
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Magalhães, Luciana Vigorito. « Estimativa de sexo pelo índice canino mandibular em população da região Sudeste do Brasil ». Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/17/17143/tde-17102018-135239/.
Texte intégralRésumé :
A estimativa sexual constitui um dos aspectos primordiais da identificação, uma vez que por si só restringe grande parte da população de suspeitos. Diversos estudos vêm utilizando parâmetros odontométricos para a estimativa sexual e o canino é o dente que tem apresentado maior dimorfismo sexual na dentição humana, no entanto, esses parâmetros são população-específicos. O objetivo deste trabalho foi definir, em uma população da região sudeste do Brasil, os valores do índice canino mandibular (MCI) e MCI Standard proposto por Rao e colaboradores (1989) e suas respectivas acurácias na estimativa do sexo, bem como sua validação por meio da análise de classificação multivariada. Em uma amostra composta por 45 homens e 45 mulheres com idade entre 18 a 35 anos, as medidas mésio-distal do dente 43 (MD43) e distância intercanina (DIC) inferior foram coletadas diretamente na boca dos voluntários, com o auxílio de um paquímetro digital, por três diferentes examinadores. Encontrou-se MCI de 0,255 e 0,248, respectivamente, para os sexos masculino e feminino e MCI Standard de 0,240 com acurácia média de 52,22%. Tal resultado poderia indicar que as medidas utilizadas não apresentam dimorfismo sexual significativo ou apenas a ineficácia da metodologia nesta população. Para confirmação, aplicou-se a análise de classificação multivariada, que apontou a correlação entre as medidas MD43, DIC inferior e sexo, com acurácia média de cerca de 75 a 80%, confirmando o dimorfismo sexual nesses parâmetros. Portanto, concluiu-se que as medidas que compõe o MCI são boas para a predição do sexo, no entanto, as fórmulas do MCI não são eficazes na população estudadaSex estimation is one of the primary aspects of identification, since it restricts a large part of the suspect population. Several studies have used odontometric parameters for sex estimation and the canine is the tooth that has presented greater sexual dimorphism in the human dentition, however, these parameters are populationspecific. The aim of this study was to define the values of the mandibular canine index (MCI) and MCI Standard proposed by Rao et al. (1989) in a Brazilian Southeast population and their respective accuracy in the sex estimation as well as its validation through the multivariate classification analysis. In a sample of 45 men and 45 women aged 18 to 35 years, the measurements of the mesio-distal distance of the right lower canine (MD43) and the inferior intercanine distance (DIC) were collected directly in the mouth with the aid of a digital caliper by three different examiners. MCI was 0.255 and 0.248 respectively, for the male and female, MCI Standard of 0.240, with an average accuracy of 52.22%. This result could indicate that the measures used do not present significant sexual dimorphism or only the ineffectiveness of the methodology in this population. For confirmation, the multivariate classification analysis was applied, which pointed out the correlation between the measurements MD43, DIC and sex, with an average accuracy of about 75 to 80%, confirming the sexual dimorphism in these parameters. Therefore, it was concluded that the measures that make MCI are good for sex prediction, however, MCI formulas are not effective in the study population
37
Galing, Steven E. « Estimating commute distances of U.S. Army Reservists by regional and unit characteristic ». Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA239946.
Texte intégralRésumé :
Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 1990.Thesis Advisor(s): Johnson, Laura. "September 1990." Description based on title screen as viewed on December 15, 2009. DTIC Identifier(s): Travel time, commute distance, short range (distance), regression analysis, geographic areas, theses. Author(s) subject terms: Euclidean distance, power transformation, maximum likelihood estimators, multiple regression. Includes bibliographical references (p. 104-108). Also available in print.
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Belousov, Dennis. « Development of a Vehicle Simulation Model Consisting of Low and High Frequency Dynamics ». Thesis, Linköpings universitet, Fordonssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-133236.
Texte intégralRésumé :
As vehicle testing on existing vehicles is both time and resource consuming, the work of testing safety algorithms on vehicle is desired to be made more efficient. Therefore the goal of this thesis is to study and develop a vehicle simulation model that can simulate desired dynamics of existing and non-existing vehicles. The developed model consist of two areas of application: slow dynamics and vibrational dynamics. These areas are developed and validated using different methods, but as a part of the simulator, they are to be simulated together. For the slow, low frequency, vehicle motion, a three state transient motion model is derived and examined. The possibility of parametrisation is studied and performed using prediction error minimisation. For the vibration, high frequency model, a combination of a linear quarter car model with wheel motion is used to estimate road vibration characteristics. The modelled road is used to simulate the vehicle behaviour. The suggested methods regarding the vibration modelling and road estimation are performed using power spectral density as the road is not known determinately. Wheel speeds are used to study the power spectral densities as they are available at high sampling frequencies. The available tools and sensors used during this thesis are limited to existing vehicle sensors and GPS signals. The effect of this limitation is studied and the results are discussed.
39
Alshatshati, Salahaldin Faraj. « Estimating Envelope Thermal Characteristics from Single Point in Time Thermal Images ». University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1512648630005333.
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Yilmaz, Deniz. « Estimation Of Specific Flow Duration Curves Using Basin Characteristics Of Rivers In Eastern Blacksea Basin ». Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613279/index.pdf.
Texte intégralRésumé :
New and renewable energy resources are important in view of reduction of greenhouse gasses causing climate change and in eliminating of dependence on foreign sources in energy respects. Within this context, hydraulic energy is evaluated as one of the prior energy resources that should be utilized. Turkey has 26 basins and Eastern Black Sea Basin is one of the most feasible basins with a lot of small hydroelectric power plants. In the other hand, there is not enough number of discharge gauging stations in the basin. For that reason, up to now generally area ratio method has been used to estimate the project discharges of small hydroelectric power plants. Objective of this study is to estimate &ldquothe project discharge&rdquo
which is corresponding to 5 flow percentiles (5%, 10%, 15%, 20%, 25%) depending on topographical, meteorological, hydrologic and soil-land cover parameters through developing a multilinear statistical model for Iyidere Basin as a part of Eastern Black Sea Basin. Perimeter of the basin, the ratio of the basin perimeter to the main stream length of the same basin, the drainage frequency, the mean slope of basin, v the mean annual precipitation and the curve number are the parameters that have been analysed for the multilinear statistical model. Principal Component Analysis, Multiple Regression Analysis and Stepwise Regression Analysis have been run for the data sets. For the computed discharges validation has been done. As a result of validation, it has been seen that the stepwise regression gives much closer discharge values to the observed values than the multiple regression results.
41
Lee, Hyeonju. « Estimation of visual quality and canopy characteristics of turfgrass using spectral reflectance and digital imagery ». Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/922.
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Heydari, F. « On the estimation of stability and control characteristics of a generalised forward swept wing aircraft ». Thesis, Cranfield University, 1986. http://hdl.handle.net/1826/3389.
Texte intégralRésumé :
The research which is the subject of this thesis was sponsored by the Ministry of Defence(Procurement Executive) under the terms of Research Agreement no. 2028/0156 XR/AERO.Recent advances in composite structures and active control systems have made the concept of a forward swept wing aircraft a viable alternative to the more conventional configurations. This thesis encompasses some of the work resulting from a three year research program covering the dynamic behaviour and characteristics of a FSW aircraft having a closely coupled canard. The dynamic model has been based on the output of a first order optimisation routine with emphasis on minimum induced drag and static margin as the two most important criteria. Stability characteristics of the dynamic model were extracted from the transient response tests in both longitudinal and lateral modes by means of a statistical method, namely Extended Kalman Filter (E. K. F. ). In carrying out the dynamic tests, use was made of the facilies outlined by Ref. 8. Validated through computer based experiments, the Extended Kalman Filter algorithm has successfully been applied to the open-loop wind tunnel tests. Simulations of the equations of motion using estimates of stability derivatives obtained in this way closely match the observed behaviour. Furthermore, substitution of aerodynamic data obtained via static wind tunnel measurements in theoretically derived expressions for some of the stability derivatives has resulted in an alternative set of stability derivative estimates. ' Finally, estimates of the stability derivatives obtained with the E. K. F., first order optimisation program and static tests are compared. Although the results are limited to very low subsonic Mach numbers, nevertheless, they are very encouraging. It is hoped that future work might extend the studies into unstable flight regimes.
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Kishida, Kiyoshi. « Experimental study on the estimation of discontinuity characteristics and mechanical properties of jointed rock masses ». Kyoto University, 1999. http://hdl.handle.net/2433/77927.
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Galing, Steven E. « Estimating commute distances of U.S. Army Reservists by regional and unit characteristics ». Thesis, Monterey, California : Naval Postgraduate School, 1990. http://hdl.handle.net/10945/34891.
Texte intégralRésumé :
Approved for public release; distribution unlimited.This thesis develops a multiple regression model using regional and unit characteristics to estimate commuting distances of U.S. Army Reservists. The data were obtained from a 1988 file established by the Defense Manpower Data Center containing locational and biodemographic information on 238,174 enlisted reservists. A random sample of 91 reserve centers was selected for the analysis. The logistic and normal distributions were evaluated as possible candidates for fitting the commuting distance distribution. It was found that a power transformation of the fractional distance traveled fit both distributions quite well. Parameters for the two distributions are obtained through a method of maximum likelihood estimation. Finally, a multiple regression equation is used to estimate the parameters of the commute distance distribution as a function of reserve center and market characteristics.
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Law, Eugene L. « Estimating the Characteristics of the Aeronautical Telemetry Channel during Bit Error Events ». International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608759.
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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, NevadaThis paper presents estimated aeronautical telemetry channel characteristics during bit error events. A T-39 aircraft was flown around various test corridors while transmitting a filtered 10 Mb/s pseudo-noise (PN) sequence binary phase shift keying (BPSK) signal. The received signal was down converted to 70 MHz, digitized when trigger criteria were met, and stored for later analysis. Received signal strength was also recorded. The first step in data analysis consisted of dividing the fast Fourier transform (FFT) of the recorded signal by the FFT of the expected signal. The received signal strength data was then used to correct for flat fade effects. The resulting signal is the difference (dB) between the expected signal at the receiver intermediate frequency (IF) output and the measured receiver IF output during the error event. This difference is the aeronautical telemetry channel characteristic. The characteristics of this difference signal were then matched against a 2-ray and 3-ray multipath fading model with reflected signal amplitude and path delay as the variables.
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Moore, Therese C. « Estimation of the source signal characteristics and variability of blue whale calls using a towed array ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA366864.
Texte intégralRésumé :
Thesis (M.S. in Meteorology and Physical Oceanography) Naval Postgraduate School, June 1999.June 1999" Thesis advisor(s): Ching-Sang Chiu, Curtis A. Collins. Includes bibliographical references (p. 43-45). Also available online.
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Kealey, Courtney Gail. « Estimation of genetic parameters of yearling scrotal circumference and semen characteristics in line 1 Hereford bulls ». Thesis, Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/kealey/KealeyC0805.pdf.
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Objectives of this research were to estimate heritabilities of scrotal circumference and semen traits, and genetic correlations among these traits and birth weight. Line 1 Hereford bulls (n = 841), born in 1963 or from 1967 to 2000, were selected for use by USDA-ARS at Miles City, Montana or for sale. Semen was collected by electro-ejaculation when the bulls were approximately one year of age (mean = 446d) and all samples were evaluated by one person. Traits analyzed were scrotal circumference, color, volume, concentration, swirl, motility, and percents normal, live, abnormal heads, abnormal mid-pieces, proximal distal droplets, bent tails, coiled tails, distal proximal droplets, and primary and secondary abnormalities. Data were analyzed using MTDF-REML. Models included fixed effects for contemporary group, age of dam, age of bull at evaluation, inbreeding of the bull and his dam, and random animal, maternal, permanent maternal environmental, and residual effects. Heritability estimates for scrotal circumference, color, volume, concentration, swirl, motility, and percents normal, live, abnormal mid-pieces, proximal distal droplets, coiled tails, and primary and secondary abnormalities were 0.57, 0.15, 0.09, 0.16, 0.21, 0.22, 0.23, 0.34, 0.17, 0.34, 0.30 0.34, and 0.29, respectively. Estimates of genetic correlations between birth weight and scrotal circumference, color, volume, concentration, swirl, motility, and percents normal, live, abnormal mid-pieces, proximal distal droplets, coiled tails, and primary and secondary abnormalities were 0.36, 0.60, 0.07, 0.58, 0.44, 0.21, 0.20, 0.34, -0.03, -0.52, -0.20, -0.25, and 0.05, respectively. The moderate estimates of heritability for many of the traits indicate potential for favorable selection response. Positive genetic correlations between birth weight and majority of the traits suggest selection to reduce birth weight may compromise semen traits. However, for most traits the expected correlated responses are small. Desirable genetic correlations among scrotal circumference and semen traits suggest selection for one trait would not compromise the other semen traits. Expected correlated responses in semen traits to selection for increased scrotal circumference appear favorable.
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Karaaslan, Huseyin Nail. « Estimation Of Specific Flow Duration Curves Using Basin Characteristics Of Rivers In Solakli And Karadere Basins ». Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612873/index.pdf.
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Demand for energy is constantly growing both in the world and in Turkey. Sustainable development being an important concept, development of small hydro power projects has been popular in recent years. Eastern Black Sea Basin in Turkey has a lot of small hydro power potential because of high amount of precipitation and existence of steep slopes. Since the amount of river runoff is the only parameter that is variable in order to determine the power potential, it is vital to estimate the project discharge in ungauged basins accurately that have hydro power potential. Projects discharges of hydro-power plants in ungauged basins have been calculated using conventional methods up to now. This study aims to introduce a statistical model in linear and multi-variate form using the topographical and morphological parameters derived from GIS and hydro-meteorological variables to estimate the specific flow duration curves of potential small hydro-power locations for the selected study areas in Eastern Black Sea Region namely Solakli and Karadere basins. As well as developing an annual regression model using the annual values of hydro-meteorological parametersseasonal regression model (spring season) has also been developed by including the mean seasonal (spring) air temperature variable instead of snow covered area (SCA) in addition to basin parameters. By studying the spring model, effect of different variables from the annual model were tested and discussed with some recommendations for the future studies.
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Ghaffari, Novin. « Estimation with stable disturbances ». Thesis, 2014. http://hdl.handle.net/2152/29165.
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The family of stable distributions represents an important generalization of the Gaussian family; stable random variables obey a generalized central limit theorem where the assumption of finite variance is replaced with one of power law decay in the tails. Possessing heavy tails, asymmetry, and infinite variance, non-Gaussian stable distributions can be suitable for inference in settings featuring impulsive, possibly skewed noise. A general lack of analytical form for the densities and distributions of stable laws has prompted research into computational methods of estimation. This report introduces stable distributions through a discussion of their basic properties and definitions in chapter 1. Chapter 2 surveys applications, and chapter 3 discusses a number of procedures for inference, with particular attention to time series models in the ARMA setting. Further details and an application can be found in the appendices.text
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Chen, Kai-Fu, et 陳凱復. « Estimation of multivariate characteristic values in geotechnical design ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/39j5w3.
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碩士國立臺灣大學
土木工程學研究所
105
The definition of characteristic value has two different parts. First of all, the value affecting the occurrence of the limit state and cautious estimate. In this research, cautious estimate is the core issue. Moreover, the geotechinical parameter which conform in affecting the occurrence of the limit state is called mobilized value. Eurocode 7 hopes the estimate of mobilized value supposed to locate in confidence level of 95%. This cautious estimate is about 5% fractile. However, there are two possible interpretations for the 5% quantile for the characteristic value in Eurocode 7. The first interpretation is that the 5% quantile is on the input geotechnical parameters. The second interpretation is that the 5% quantile is on the output limit state G. The major issue of this research explains the two ideas above which is the closest to Eurocod 7’s purpose. According to Eurocode 7’s purpose, the probability value of estimate should be controlled in 5% which is lower than genuine in-situ strength parameter. By going through first and second interpretation, structure deisgn would be simulated. Figuring out the probabilty of structur failure, First interpretation is found that probaility of failure has highly variable and the failure probability is very small. However, second interpretation does not has those problems. However, second interpretation requires the CDF of the limit state G and the ability to control this CDF. The two requirements are very unrealistic for engineer. This research hope to propose an approximate fulfilling second interpretation.