Дисертації з теми "Estimability analysis of parameters"
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1
Bouchkira, Ilias. "Modélisation thermodynamique des solutions d'acides sulfurique et phosphorique en présence du minerai de phosphate : applications à l'encrassement, à la cristallisation et à l'optimisation multicritère d'une unité industrielle de production d'acide phosphorique." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0056.
Анотація:
Ce travail de thèse traite du développement d’un modèle thermodynamique et de son exploitation dans la modélisation, la simulation et l’optimisation des procédés de fabrication d’acide phosphorique. Il est décrit par des équations de bilans de matière et de charge, des équations d’équilibres chimiques, et l’équation du modèle de Pitzer. Il met en jeu plusieurs paramètres inconnus à identifier à partir de mesures expérimentales issues d’une base de données construite dans ce travail. Elle contient des mesures de spéciation d’acides phosphorique et sulfurique, des mesures de solubilité de dix minéraux, et des mesures de l’activité de l’eau de huit systèmes binaires. Ces mesures sont effectuées dans des conditions de températures allant de 298K à 353K et des concentrations allant de 0 mol/kg d’eau à 20 mol/kg d’eau. Une méthode basée sur l'analyse de sensibilité globale des paramètres est ensuite développée et utilisée pour évaluer l'estimabilité des paramètres inconnus. Ceux qui sont estimables sont alors identifiés, et les valeurs de ceux qui ne le sont pas sont fixées à partir de la littérature ou de précédentes études. Des mesures expérimentales, différentes de celles qui ont servi pour l’identification des paramètres, sont réalisées pour valider le modèle. Le test statistique F de Fisher-Snedecor et le test de Kolmogorov-Smirnov sont notamment utilisés. Les résultats de ces tests confirment les qualités de prédiction du modèle. Ce dernier est d’abord exploité dans l’optimisation multicritère d’une unité industrielle de production d’acide phosphorique, notamment pour la minimisation des pertes chimiques en phosphate et l’amélioration du rendement de l’unité. Il est ensuite utilisé dans l’analyse des problèmes d’encrassement qui se produisent lors de la production d’acide phosphorique et altèrent les performances des différentes unités du procédé de fabrication. Il est enfin exploité dans la modélisation et la simulation de la cristallisation des sulfates de calcium lors de la production de l’acide phosphorique. Le modèle ainsi validé et déjà exploité peut désormais être utilisé comme outil prédictif pour la conception et le fonctionnement optimal des procédés de fabrication d’acide phosphorique existants, voire pour le développement de nouveaux procédés plus intégrés et plus performantsThis PhD work deals with the development of a thermodynamic model and its use in the modeling, simulation and optimization of phosphoric acid manufacturing processes. It consists of mass and charge balance equations, chemical equilibrium equations, and Pitzer’s model equation. The model involves several unknown parameters to be identified from experimental measurements available in a database developed in this work. It contains data on speciation of phosphoric and sulfuric acids, on solubility of ten minerals, and on water activity of eight binary systems. The measurements are performed under temperature conditions ranging from 298K to 353K and concentrations ranging from 0 mol/kg water to 20 mol/kg water. A global sensitivity based estimability analysis is then developed and used to evaluate the estimability of the unknown parameters from the available data. The estimable parameters are then identified, and the values of the non-estimable ones are taken from the literature or from previous studies. Additional experimental measurements, different from those used for the identification of parameters, are carried out to validate the model. The Fisher-Snedecor statistical test and the Kolmogorov-Smirnov test are particularly used. The results of the tests confirmed the quality of the model predictions. The validated model is first exploited in the multi-objective optimization of an industrial unit of phosphoric acid production, in particular to minimize the chemical losses of phosphate and to improve of the performance of the unit. It is then used to investigate the fouling problems that occur during the production of phosphoric acid and alter the performance of different units of the manufacturing process. Finally, the model is exploited in the modeling and simulation of the crystallization of calcium sulfates during the production of phosphoric acid. The model thus validated and already exploited can now be used as a predictive tool for the design and optimal operation of existing phosphoric acid manufacturing processes, or even for the development of new processes which are more integrated and more efficient
2
Markgren, Hanna. "Fatigue analysis - system parameters optimization." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-151755.
Анотація:
For a mechanical system exposed to repeated cyclic loads fatigue is one of the most common reasons for the system to fail. However fatigue failure calculations are not that well developed. Often when fatigue calculations are made they are done with standard loads and simplified cases. The fatigue life is the time from start of use until the system fails due to fatigue and there does exist some building blocks to calculate the fatigue life. The aim for this project was to put these building blocks together in a workflow that ca be used for calculations of the fatigue life. The workflow was built so that it should be easy to follow for any type of me- chanical system. The start of the workflow is the load history of the system. This is then converted into a stress history that is used for the calculations of the fatigue life. Finally the workflow was tested with two test cases to see if it was possible to use. In Algoryx Momentum the model for each case was set up and then the load history was extracted for each time step during the simulation. To convert the load history to stress history FEM calculations was needed, this was however not a part of this project so the constants to convert loads to stress was given. Then with the stress history in place it was possible to calculate the fatigue life. The results from both test cases were that it was possible to follow every step of the workflow and by this use the workflow to calculate the fatigue life. The second test also showed that with an optimization the system was improved and this resulted in a longer lifetime. To conclude the workflow seems to work as expected and is quite easy to follow. The result given by using the workflow shows the fatigue life, which was the target for the project. However, to be able to evaluate the workflow fully and understand how well the resluts can be trusted a comparison with empiric data would be needed. Still the results from the tests are that the workflow seem to give reasonable results when calculating fatigue life.
3
Kirkwood, Jobie Samuel. "Analysis of protein crystallisation parameters." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/9656/.
Анотація:
Proteins are biochemical molecules that are essential for life processes. Their function is linked to their structure and so it follows an understanding of their structure will assist in an understanding of their function. The predominant method of solving protein structures is X-ray crystallography and for this a protein crystal is required. The process of obtaining a crystal is amongst the phases of the structure determination process with the highest rates of attrition. Analyses are performed throughout this thesis, which are intended to help improve output for this bottleneck. It has been possible to develop a method to determine pH using a spectrophotometer and acid-base indicator in an accurate, rapid and efficient manner. A method for predicting the pH of buffered solutions has also been developed and these predicted pH values are linked to the isoelectric point of a protein sequence. The isoelectric point is in turn used in classification, along with many other features, to determine a protein's propensity to crystallise. Finally, the most prevalent and successful chemical species in crystallisation are explored, compared and linked. These chemicals are used to design a new crystallisation screen.
4
Oosthuizen, Lizle Joann. "Impact of obesity on semen analysis parameters." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/19888.
Анотація:
Includes bibliographical referencesThis study aims to address the lack of data on the link between BMI and infertility in the South African population by describing the prevalence of male overweight and obesity in a group of men undergoing infertility investigation, as well as assessing any semen analysis abnormalities in these groups. It also aims to describe how well men can predict their BMI category and determine whether weight loss would be an acceptable part of infertility management in overweight or obese male partners. Beliefs surrounding healthy weight and fertility will also be addressed.
5
Hin, Lin Yee. "Analysis and Modelling of Implied Market Parameters." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/208.
Анотація:
This dissertation addresses market information extraction from option and zero coupon prices, its representation as contingent claim pricing model parameters, and its application in financial parameters analysis and forecast. We analyse implied volatility estimation sensitivity with respect to discount rate uncertainty. We develop a strategy to jointly infer implied discount rate and implied volatility from option prices. We infer market information from zero coupon prices in multiple yield curve framework to predict future short rate.
6
Bennia, Abdelhak. "Mimo systems parameters identification." Thesis, Virginia Tech, 1986. http://hdl.handle.net/10919/41579.
Анотація:
In this thesis, a presentation of a new canonical representation of multi-input multioutput systems is given. The new characterization covers the full range of practical situations in linear systems according to the structural properties and model of the perturbations which are known. Its direct link to ARMA processes as well as to classical state space representation ls also given.
The importance of the new representation lies in the fact that all unknown parameters and state variables appear linearly multlplied by either external variables (inputs and outputs) that appear in the data record, or by matrices that are only composed of ieroes and ones. This property enables us to perform a joint state and parameters estimation. Moreover, if the noises are gaussian and their statistics are known, an on-line algorithm that involves a standard dlscrete-time time-varying Kalman filter is proposed and used successfully in the estimation of unknown parameters for simulated examples.
Master of Science
7
Shao, Rui. "Effect of experimental parameters on simultaneous thermal analysis." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/SHAO_RUI_44.pdf.
8
Nik, Idris Nik Ruzni. "Estimating meta analysis parameters in non-standard data." Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432097.
9
Marrero, Robert L. Jr. "Analysis of Variable Insensitive Friction Stir Welding Parameters." ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2385.
Анотація:
Friction Stir Welding (FSW) was used to perform a Design of Experiment (DOE) to determine the welding parameters effects on yielding consistent mechanical properties across the length of the weld. The travel speed was varied across set forge force and RPM conditions, to find a dataset that will yield consistent mechanical properties independent of the travel speed. Six different welds were completed on two different aluminum panels, the advancing side being Aluminum alloy 2195-T8 at a thickness of .350”, with the retreating side being Aluminum alloy 2219-T851 with a gauge thickness of .360”. A Left-hand Right-hand self-reacting pin tool was used for each weld. The mechanical properties of interest are the Ultimate Tensile Strength, Yield Strength, Elasticity and Hardness. The strengths were evaluated by tensile testing, with the Elasticity being measure post break. Specimens were then polished where macrograph and micrograph analysis was completed. Micro-hardness testing was then completed on the weld nuggets.
10
Jacobs, Patricia A., Donald Paul Gaver, and Arthur Fries. "Prediction of changeover performance operational test (OT) parameters from developmental test (DT) parameters via meta-analysis." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/24476.
11
Al-Jowder, Anwar. "Analysis of digital communication signals and extraction of parameters." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA294482.
Анотація:
Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1994."December 1994." Thesis advisor(s): Ralph Hippenstiel, D.v.Z. Wadsworth. Includes bibliographical references. Also available online.
12
Adetula, Bolade Adewale. "Global sensitivity analysis of reactor parameters / Bolade Adewale Adetula." Thesis, North-West University, 2011. http://hdl.handle.net/10394/5561.
Анотація:
Calculations of reactor parameters of interest (such as neutron multiplication factors, decay heat,
reaction rates, etc.), are often based on models which are dependent on groupwise neutron cross
sections. The uncertainties associated with these neutron cross sections are propagated to the final
result of the calculated reactor parameters. There is a need to characterize this uncertainty and to
be able to apportion the uncertainty in a calculated reactor parameter to the different sources of
uncertainty in the groupwise neutron cross sections, this procedure is known as sensitivity analysis.
The focus of this study is the application of a modified global sensitivity analysis technique to
calculations of reactor parameters that are dependent on groupwise neutron cross–sections. Sensitivity
analysis can help in identifying the important neutron cross sections for a particular model,
and also helps in establishing best–estimate optimized nuclear reactor physics models with reduced
uncertainties.
In this study, our approach to sensitivity analysis will be similar to the variance–based global
sensitivity analysis technique, which is robust, has a wide range of applicability and provides
accurate sensitivity information for most models. However, this technique requires input variables
to be mutually independent. A modification to this technique, that allows one to deal with input
variables that are block–wise correlated and normally distributed, is presented.
The implementation of the modified technique involves the calculation of multi–dimensional integrals,
which can be prohibitively expensive to compute. Numerical techniques specifically suited
to the evaluation of multidimensional integrals namely Monte Carlo, quasi–Monte Carlo and sparse
grids methods are used, and their efficiency is compared. The modified technique is illustrated and
tested on a two–group cross–section dependent problem. In all the cases considered, the results obtained
with sparse grids achieved much better accuracy, while using a significantly smaller number of samples.Thesis (M.Sc. Engineering Sciences (Nuclear Engineering))--North-West University, Potchefstroom Campus, 2011.
13
Pixner, Konrad. "Analysis of parameters to challenge fundamental principles in viticulture." Master's thesis, ISA, 2011. http://hdl.handle.net/10400.5/8595.
Анотація:
Mestrado Vinifera EuroMaster - Instituto Superior de AgronomiaThree different pruning methods were used as a model system to challenge fundamental principles in viticulture. Different viticultural and physiological parameters of field grown Chardonnay, Sauvignon blanc, Chenin blanc and Syrah have been quantified, analysed and compared; main focus was on the comparison of ratios between and amongst vegetative and reproductive parameters. Changes in grapevine morphology due to the pruning system as already described in literature could be proofed; number of buds left at winter-pruning is “correlated” with the number of shoots, leaves and bunches formed during the next year. Shoot length, internode length, leaf size and bunch mass are correlated inversely to the number of remaining winter buds. Source:sink relationship has been affected by pruning method due to changes in size and priority of the source and sink organs, which also affected carbon allocation as well as plant biomass development. Impacts on the rachis development have been found, impacting on the % share of berries on a bunch and the ratio rachis length to rachis mass. Alternative pruned vines seemed to have more sanitary problems and appeared not to be adapted for high quality grape production. Almost no parameter or ratio was stable when changing pruning system; indicating the difficulty of imposing absolute numbers and use them as a recipe for decision making in viticulture
14
Fang, Yuguang. "Stability analysis of linear control systems with uncertain parameters." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057598985.
15
Liu, Hui. "Performance analysis of DOA estimation algorithms using physical parameters." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4362.
Анотація:
Analytical performance analysis on Direction-Of-Arrival (DOA) estimation algorithms has attracted much excellent research in recent years, various statistical properties have been revealed. However, in most of these analyses, insights of the performance were masked because of the involvement of singular values and singular vectors which depend on the character of the algorithms and data structures in a complex and nonlinear manner.
16
Zamperin, Filippo <1994>. "Testing standard technical analysis parameters' efficiency, a metaheuristic approach." Master's Degree Thesis, Università Ca' Foscari Venezia, 2020. http://hdl.handle.net/10579/17564.
Анотація:
The thesis proposed is aimed to exploit the profitability of Technical Analysis (TA) identifying among the wide set of indicators a sub-set of them, widely used both in literature and in practise, to optimize with metaheuristic algorithms and to test using a trading system. Since its introduction, there has been a wide discussion about the profitability of TA and mostly of the time it has been compared with the fundamental and Buy-And-Hold strategy. To achieve superior performance a trading system should be run using TA indicators that promptly signal when it is time to buy and sell. However, to find such TA indicators' values it requires the solution of a complex problem that can be expressed as an optimization one.The thesis proposed wants to compare three different metaheuristic algorithms, Particle Swarm Optimization (PSO), Differential Evolution (DE) and Fireworks (FWA), searching among them which one perform better.
17
Akhter, A. S. "Estimating the parameters of the truncated normal distribution." Thesis, University of Essex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378366.
18
Biswas, Sanjeet Kumar. "Analysis and comparison of network performance with different network parameters." FIU Digital Commons, 1999. http://digitalcommons.fiu.edu/etd/1703.
Анотація:
The purpose of this study was to analyze the network performance by observing the effect of varying network size and data link rate on one of the most commonly found network configurations. Computer networks have been growing explosively. Networking is used in every aspect of business, including advertising, production, shipping, planning, billing, and accounting. Communication takes place through networks that form the basis of transfer of information. The number and type of components may vary from network to network depending on several factors such as requirement and actual physical placement of the networks. There is no fixed size of the networks and they can be very small consisting of say five to six nodes or very large consisting of over two thousand nodes. The varying network sizes make it very important to study the network performance so as to be able to predict the functioning and the suitability of the network. The findings demonstrated that the network performance parameters such as global delay, load, router processor utilization, router processor delay, etc. are affected.
The findings demonstrated that the network performance parameters such as global delay, load, router processor utilization, router processor delay, etc. are affected significantly due to the increase in the size of the network and that there exists a correlation between the various parameters and the size of the network. These variations are not only dependent on the magnitude of the change in the actual physical area of the network but also on the data link rate used to connect the various components of the network.
19
McKinnon, Mika. "Landslide runout: statistical analysis of physical characteristics and model parameters." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/25835.
Анотація:
Landslides are treacherous, but risk management actions based on improved prediction of landslide runout can reduce casualties and damage. Forty rapid flow-like landslides of variable volume, entrainment, and composition are used to develop a volume-runout regression, which is compared to those established in previous research.
The cases are analyzed to identify the most critical characteristics observable prior to failure which differentiate between events of high and low mobility.
Mitigating long-runout flow-like landslides requires accurate hazard mapping, a task best accomplished through runout modelling.
Current practice requires back-analyzing a set of cases consistent in scope with the target event, then applying the same rheology and parameters to forward modelling. This thesis determines which aspects of scope are most important to prioritize when selecting similar cases, as volume, movement type, morphology, and material have a more substantial influence on mobility than other physical characteristics.
Statistical analysis of the performance of frictional and Voellmy rheologies over a range of parameters for the forty case studies provides the expected mean normalized runout and associated standard deviation, and recommendations for parameters to use in initial forward modelling of prospective events.
20
Mohamad, Hamzah Firdaus. "Statistical analysis of freshwater parameters monitored at different temporal resolutions." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3350/.
Анотація:
Nowadays, it is of great importance in ecological and environmental studies to investigate some prominent features in environmental determinants using appropriate statistical approaches. The initial motivation of this work was provided by the enthusiasm of the limnologist, biologist and statistician, interested in exploring and investigating certain features of time series data at different temporal resolutions to environmental parameters in freshwater. This thesis introduces a variety of statistical techniques which are used to provide sufficient information on the features of interest in the environmental variables in freshwater. Chapter 1 gives the background of the work, explores the details of the locations of the case studies, presents several statistical and ecological issues and outlines the aims and objectives of the thesis. Chapter 2 provides a review of some commonly used statistical modelling approaches to model trend and seasonality. All the modelling approaches are then applied to low temporal resolution (monthly data) of temperature and chlorophyll measurements from 1987-2005 for the north and south basins of Loch Lomond, Scotland. An investigation into the influence of temperature and nutrients on the variability of log chlorophyll is also carried out. Chapter 3 extends the modelling for temperature in Chapter 2 with the use of a mixed-effects model with different error structures for temperature data at a moderate temporal resolution (1 and 3 hourly data) in the north, mid and south basins. Three approaches are proposed to estimate the positions of a sharp change in gradient of temperature (thermocline) in deeper basins, using the maximum relative rate of change, changepoint regression and derivatives of a smooth curve. Chapter 4 investigates several features in semi-continuous environmental variables (15 and 30 minutes data). The temporal pattern of temperature, pH, conductivity and barometric pressure, and the evidence of similarity of the signals of pH and conductivity is determined, using wavelets. The time taken for pH and conductivity to return to `baseline levels' (recovery period) following extreme discharge is determined for different thresholds of `extreme discharge' for the Rivers Charr and Drumtee Burn, Scotland and models for the recovery period are proposed and fitted. Model validation is carried out for the River Charr and the occurrence of clusters of extreme discharge for both rivers is investigated using the extremal index. Chapter 5 summarises the main findings within this thesis and several potential areas for future work are suggested.
21
Hebb, Richard Ian. "Thermoelastic stress analysis of crack tip parameters using genetic algorithms." Thesis, University of Southampton, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.560794.
Анотація:
Thermoelastic Stress Analysis (TSA) is a well established technique for studying stress fields around a crack tip. Recent work utilised the observation that individual isopachics (contours of constant stress) around a crack tip appeared to take the form of a cardioid. Various computational approaches were successfully used to estimate stress intensity factors using the first order Westergaard equations. Whilst this worked well for mode I cracks, there was less success when applying the equation to mixed mode situations; it appeared as though a pure cardioid form was not an appropriate description of the isopachics for mixed mode cracks. The work carried out in this thesis concentrates on (i) developing an algorithm that is able to accurately estimate crack tip parameters from thermoelastic data using the Williams expansion and (ii) evaluating the effectiveness of the approach using simulated fields. In the first part of the study it is shown that the higher order terms in the Williams expansion are responsible for creating the rotation of the isopachics noted in previous work. One of the higher order terms in the expansion is the T-stress which is thought to be responsible for controlling the stability of crack growth. A differential evolution is used to estimate the parameters of the Williams expansion and fit the parameters to thermoelastic data. This would allow the calculation of the stress intensity factors and T-stress for the crack, as well as estimate the crack tip position. Both mode I and mixed mode plates are used in an effort to accurately calculate the crack tip parameters. It is shown from both experimental results and simulations that using DE to fit the Williams expansion directly to thermoelastic data is technique that requires further work and investigations. Although the crack tip can be accurately located, the stress intensity factors and T-stress estimations are consistently inaccurate. It is also shown that the results of the parameters are dependent upon the size of the data array used. The T-stress is never accurately estimated and the results for the stress intensity factors are inconsistent. However, the shortcomings of the DE algorithm are highlighted, and possibilities to remedy the problems are suggested.
22
VIEIRA, ROBSON DOMINGOS. "MIMO MEASURED CHANNELS: CAPACITY RESULTS AND ANALYSIS OF CHANNEL PARAMETERS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7954@1.
Анотація:
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOSistemas com múltiplas antenas transmissoras e receptoras, também conhecidos como sistemas MIMO (Multiple Input-Multiple Output), têm sido apontados como uma solução para aumentar a capacidade de enlaces sem fio, permitindo aos usuários utilizar aplicações com altas taxas de dados. Isto é extremamente importante em sistemas onde a capacidade obtida com as técnicas tradicionais é bastante limitada devido às características do ambiente de propagação. Com o sistema MIMO, algumas destas características são exploradas para criar canais paralelos e obter aumento expressivo de capacidade. A análise da capacidade de sistemas MIMO se baseia em uma modelagem desenvolvida a partir do comportamento estatístico dos pares de enlaces existentes entre as múltiplas antenas transmissoras e receptoras. Existe, portanto, um grande interesse em medir este comportamento para situações típicas bem como em relacioná-lo a determinados parâmetros do sistema. Nesta tese apresentam-se os resultados de uma campanha de medidas visando caracterizar canais MIMO de faixa estreita e faixa larga em ambientes fechados (indoor) com uma freqüência de portadora de 2GHz. A partir dos dados medidos, avalia-se a capacidade e diversos parâmetros do canal espaço-temporal. Os parâmetros do canal MIMO são estimados através do algoritmo FD-SAGE e as dispersões temporal e espacial do canal são calculadas a partir dos parâmetros estimados. Uma análise dos autovalores da matriz do canal MIMO é realizada com o objetivo de relacionar os valores da capacidade ao número de canais paralelos. É analisada, ainda, a correlação entre a capacidade e os parâmetros físicos do canal, tais como espaçamento entre os elementos do arranjo, espalhamento angular, espalhamento dos retardos, número e potência dos multipercursos.
Multiple antenna systems known as MIMO (Multiple Input Multiple Output) systems have been proposed as an effective way to address the user demand for high data rate applications in wireless systems. This is especially important in systems where the capacity attained with traditional techniques is very limited due to the adverse characteristics of the propagation environment. With MIMO, some of these characteristics are used to create parallel channels producing significant increase in capacity. The analysis of MIMO capacity is based on models developed from the statistical behavior of the multiple links between the transmitting and receiving antennas, and therefore there has been large interest in measuring these characteristics in typical scenarios and in relating the data to system parameters. In this thesis the results of a MIMO wideband measurement campaign carried out in an indoor scenario with a carrier frequency of 2 GHz is presented. The wideband and narrowband channel capacity and several channel parameters are evaluated from the measured data. The channel parameters are estimated using the frequency domain Space-Alternating Generalized Expectation maximization (FD- SAGE) algorithm. Temporal and spatial dispersions of the multipath channel are calculated from the estimated parameters and an eigenvalue analysis is performed seeking to relate the capacity values to the number of parallel channels. In addition, the correlation between channel capacity and physical parameters as antenna spacing, angle spread, delay spread, number and power of multipath components is investigated.
23
Kim, Jun-Young Sun. "Computational Analysis of the Rb-E2F Pathway: Classification of Parameters." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/595064.
Анотація:
The restriction point, or R-point, of the cell cycle behaves as a switch-like system which controls whether a cell progresses from the G1 phase to the S phase. The mechanism which controls the restriction point has been determined to be the Rb-E2F pathway. The Rb-E2F pathway is bistable; this allows for the system to exist in two states, ON or OFF, and explains the switch-like behavior observed in the R-point. The stimulus of this system is serum growth signal which exist at a concentration either low enough to keep the cells in a non-growing state called cellular quiescence or at a high level that activates the pathway into the ON state and commits the cell into proliferation. Yao et al. constructed a mathematical model to analyze the dynamics of the Rb-E2F pathway. The research of this paper involves the classification of the parameters used in this mathematical model to better understand similarities and differences of the components within the network's topology. Once classified, further analysis was performed with parameters that resulted in the decrease of bistable width. Only two phenotypes were observed from this analysis which suggests some potential evolutionary advantages of the bistable system.
24
Müller, Tobias, Alexander Lenske, Marek Hauptmann, and Jens-Peter Majschak. "Analysis of Dominant Process Parameters in Deep-Drawing of Paperboard." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-230928.
Анотація:
The application of the wrinkle measuring method described in Müller et al. (2017) and the subsequent evaluation algorithm of a range of deep-drawn samples were used to determine the influences and interdependencies of blankholder force, tool temperatures, and drawing height on the formation of wrinkles in paperboard. The main influences were identified and quantitatively evaluated. For the given experimental space, a regression function was derived and validated in further experiments. It was shown that a quadratic regression was superior to the previously used linear regression. The findings were discussed and compared with the results of similar experiments from past publications. Special attention was given to the wrinkles formed and the resulting quality of the formed paperboard cups. The restrictions of the data acquisition from the measuring method that was used and limitations of the model were presented to demonstrate the reliability of the results.
25
Mohammed, Usman Ali. "Analysis of Parameters Affecting Modal Frequencies in Bolted Joint Connections." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535709260529555.
26
Müller, Tobias, Alexander Lenske, Marek Hauptmann, and Jens-Peter Majschak. "Analysis of Dominant Process Parameters in Deep-Drawing of Paperboard." NC State University, 2017. https://tud.qucosa.de/id/qucosa%3A30665.
Анотація:
The application of the wrinkle measuring method described in Müller et al. (2017) and the subsequent evaluation algorithm of a range of deep-drawn samples were used to determine the influences and interdependencies of blankholder force, tool temperatures, and drawing height on the formation of wrinkles in paperboard. The main influences were identified and quantitatively evaluated. For the given experimental space, a regression function was derived and validated in further experiments. It was shown that a quadratic regression was superior to the previously used linear regression. The findings were discussed and compared with the results of similar experiments from past publications. Special attention was given to the wrinkles formed and the resulting quality of the formed paperboard cups. The restrictions of the data acquisition from the measuring method that was used and limitations of the model were presented to demonstrate the reliability of the results.
27
Riede, Moritz. "Identification and Analysis of Key Parameters in Organic Solar Cells." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-22610.
28
Salhi, Sana. "Structural modelling of tall buildings using generalized parameters." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66269.
29
Pekpinarli, Hakan. "Discharge Estimations With Regression Analysis Using Basin Parameters And Gis Techniques." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606035/index.pdf.
Анотація:
Discharge estimations at certain cross sections of streams are very important for hydrologic studies especially for designs. In this study, it is aimed to determine regional mathematical equations that represent annual and monthly average discharges at desired locations using basin characteristics obtained with Geographical Information Systems (GIS) techniques and regression analysis.
Study area covers three river basins, which are Gediz, Küç
ü
k Menderes and Bü
yü
k Menderes. The data used are Digital Elevation Model (DEM), monthly average discharges observed at stream gauging stations and monthly total precipitation data from the precipitation observation stations in the study area. Stream networks are delineated from DEM using a GIS software. The basin parameters obtained from DEM are drainage area, total river length, main channel slope, main channel length and mean basin slope. Precipitation amount is also included in the analyses as the sixth parameter to improve the results. Using these parameters annual and monthly average discharge equations are determined and the best equation for each month is found based on the adjusted coefficient of determination values and stepwise regression analysis. Three models, each representing a different basin and a general model that represents the whole study area are developed. The verification of the models is made using the discharges at the additionally chosen stations that are not included in the model development. An interface that acquires the drainage area for a certain cross section and estimates the discharge according to the desired regression equation is written using arc objects and visual basic programming language. At the end, regression analysis results of the models are assessed and interpreted.
30
Thompson, Duncan. "Modeling of Molecular Weight Distributions in Ziegler-Natta Catalyzed Ethylene Copolymerizations." Thesis, 2009. http://hdl.handle.net/1974/1896.
Анотація:
The objective of this work is to develop mathematical models to predict molecular weight distributions (MWDs) of ethylene copolymers produced in an industrial gas-phase reactor using a Ziegler-Natta (Z-N) catalyst. Because of the multi-site nature of Z-N catalysts, models of Z-N catalyzed copolymerization tend to be very large and have many parameters that need to be estimated. It is important that the data that are available for parameter estimation be used effectively, and that a suitable balance is achieved between modeling rigour and simplification.
In the thesis, deconvolution analysis is used to gain an understanding of how the polymer produced by various types of active sites on the Z-N catalyst responds to changes in the reactor operating conditions. This analysis reveals which reactions are important in determining the MWD and also shows that some types of active sites share similar behavior and can therefore share some kinetic parameters. With this knowledge, a simplified model is developed to predict MWDs of ethylene/hexene copolymers produced at 90 °C. Estimates of the parameters in this isothermal model provide good initial guesses for parameter estimation in a subsequent more complex model.
The isothermal model is extended to account for the effects of butene and temperature.
Estimability analysis and cross-validation are used to determine which parameters should be estimated from the available industrial data set. Twenty model parameters are estimated so that the model provides good predictions of MWD and comonomer incorporation. Finally, D-, A-,and V-optimal experimental designs for improving the quality of the model predictions are
determined. Difficulties with local minima are addressed and a comparison of the optimality criteria is presented.Thesis (Ph.D, Chemical Engineering) -- Queen's University, 2009-05-28 20:43:58.37
31
Fang, Peng-Shiang, and 方鵬翔. "Product Feasibility Analysis with Electrical Parameters." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/75000532809686952268.
Анотація:
碩士中華大學
電機工程學系
86
A product feasibility of electrical specification is not only dependent on ciruit structure, it also has closely relation with environment factors and of process parameters. In this thesis, experiments on a simple circuit are used to explored the problems on electrical specifications of integrated circuit products. We have peformed Monte Carol analysis with environment changes as well as process variations to simulate a batch of products. According to the experiment results, we have summarized some rules to provide a guide for circuit designers, process engineers, testing engieers and product engineesrs when they are designing, manufacturing, testing and developing a new product.
32
Wang, Ren-Hong, and 王仁宏. "Analysis Parameters for Pap Smear Cell." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83431855506484553056.
Анотація:
碩士中原大學
醫學工程研究所
94
Cervical cancer is a disease of highly incidence and death rate in Taiwan, and the largest age group for the women must take precautions. At present, Pap smear screening is the most effective way to prevent cervical cancer. This study detects abnormal cells according to features of stained cells and parameters of each nucleus. Features of stained cells obtained via RGB proportions of the Nucleus and Cytoplasm of cells in each lesion. In parameters for each nucleus, we use image quantification and region growing to chose Nucleus contour, herewith we obtain color, area, and textures. Then, ROC analysis ( Receiver Operating Characteristic Analysis ) was used to obtain parameters threshold in order to choose cell type. In this study, we analyze color and nucleus parameters for cells chosen from 40 Pap smear images, then automatically detect and class cells of each lesion, at last accomplish an automatic process for Pap smear. Preliminary result shows the G/B ratio of nucleus color is smaller than 1, and abnormal cell has the higher blue percentage value. In discriminating result, it is obvious to differentiate between normal and abnormal nucleus according to their RGB and area parameters. However stain or bloods on the Pap smear were easily considered abnormal nucleus, so using other stain characteristics of cell to reduce error. In test for 10 normal and 30 abnormal images, the accuracy, sensitivity and specificity were 0.975,1, and 0.9, respectively. It indicated our study's process has a good identification in distinguishing normal and abnormal pap smears. In discriminating cell's lesion degree, HSIL syncytium detection can stand on nucleus's aggregate number, and we use texture parameters to choose HSIL and LSIL while nucleus has the similar color and area. Quarter of LSIL images were considered HSIL accordingly. In test for 10 LSIL and 20 HSIL images, the accuracy, sensitivity and specificity were 0.933,1, and 0.8, respectively. It indicated our study's process has a good identification in high grade lesion pap smears. In conclusion, this system can provide an automatic process serves and identify abnormal nucleus efficiently. Moreover, both positions and parameters of nucleus can provide users compare resources and compile data through the interface of system. Image quantification and region growing which can reduce process cost were used in this study, we expect this can process large image more efficiently.
33
Chou, Ying-Pin, and 周穎濱. "Thermokinetic Parameters Analysis for Cumene Hydroperoxide." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/zn5qym.
Анотація:
碩士國立雲林科技大學
環境與安全工程系碩士班
96
Cumene hydroperoxide (CHP) and its derivatives have caused many serious explosions and fires in Taiwan. It is dangerously incurred by thermal instability, chemical contaminates, and even mechanical shock. It has been employed in polymerization for producing phenol and dicumyl peroxide (DCPO). Differential scanning calorimetry (DSC) was used to analyze the thermal hazard of CHP with sodium hydroxide (NaOH), sulfuric acid (H2SO4), and sodium bisulfite (Na2SO3). Thermokinetic parameters, such as exothermic onset temperature (T0), maximum temperature (Tmax), and enthalpy (ΔH), were obtained from thermal curve. Isothermal microcalorimetry (thermal activity monitor, TAM) was employed to investigate the thermal hazards while CHP in storage and CHP mixed with NaOH, H2SO4, and Na2SO3 under isothermal conditions in reactor or container. Tests by TAM indicated that in the temperature range from 70 to 90°C an autocatalytic reaction was demonstrated in thermal curves. According to the results from TAM test, high performance liquid chromatography (HPLC) was, in turn, adopted to analyze the result of concentration versus time. By Arreheniu’s equation, the activation energy (Ea) and rate constant (k) were calculated. Depending on the process conditions, NaOH was one of the incompatible chemicals or catalysts for CHP. When CHP is mixed with NaOH, the T0 is to reduce earlier and the reactions become more complex than the pure one, and the Ea is lower than pure CHP.
34
Chou, Shih-Ping, and 周詩頻. "Optimum Parameters Analysis Of Wind-Proof Exhauster." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/24174585804536245003.
Анотація:
碩士國立中興大學
機械工程學系
86
AbstractThe purpose of this thesis is to investigate the optimum parameters ofwind-proof exhauster. The experimental fuels of the water heater areas Propane and Butane. The studying parameters include size of outlet,height of baffle plate and angle of oblique plate. The excess air ratio, CO ratio and combustion efficiency are measured to determine thewin-proof performance. The win-proof exhauster of the present researchis a type of well win-proof performance and simple type. The Chinese National Standard 3661, 3662, 13602, 13603, and 10671 are selected asthe guidelines in present experimental study. The results shows thatsize of outlet must be more than 100mm to satisfy the CNS requirementfor CO ratio. And there is the largest out flow occur at the distanceof 37.14mm between the outlet and the baffle plate when the obliqueplate angle degree is 30. Therefor to consult the fine combustionefficiency and to satisfy the CNS requirement for CO ratio, we advicethe angle degree of the oblique plate is 45.Key words：wind-proof exhauster, height of baffle plate, angle ofoblique plate.
35
Huang, Shyi shiun, and 黃錫勳. "AAutomatic Hepatocellular Image Analysis for Morphological Parameters." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/04234373593244319483.
Анотація:
碩士國立成功大學
醫學工程學系
86
Liver cancer is one of the ten major causes of death for male and female in Taiwan area. Therefore, early detection of hepatocellular carcinoma is very important for early treatment. In clinics, the routine confirmation of hepatoma is always based upon the biopsy analysis. It is heavily dependent on physician*s experience and training. Hence, the purpose of this study is to develop an objective and quantitative liver tissue analysis system. In this study, edge based and threshold based methods are both employed to segment the nuclei for the live tissue image. The morphologicalfeatures are then extracted using Hough transform. With theseparameters, the multilayer perceptron is then applied to find the contours of nuclei. The accuracy for nucleus extraction is about 91.00﹪. Finally, the morphological parameters of nuclei needed in the biopsy analysis, such as the averaged diameter and their variations, may be evaluated automatically.
36
Chen, Chun-hui, and 陳純慧. "Shark management based on vital parameters analysis." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95653174062964403657.
Анотація:
碩士國立臺灣海洋大學
海洋資源管理研究所
95
Sharks own various life history characteristics. Therefore, a shark management based on vital parameters is more reasonable and realistic. In this study, the life history traits of 63 populations from 39 species were collected from literatures. The life history parameters included the ratio between size at birth and asymptotic length (Lb/L∞), the ratio between size at maturity and asymptotic length (Lm/L∞), maximum age (Tmax), age at maturity (Tm), growth rate (k) and the ratio between fecundity and reproduction cycle (f/Rc) were anlyzed with principal components analyses (PCA) and calculated factor coordinates. After that, our research divided 63 shark populations into 4 groups based on the results of cluster analysis. The relationships between population increase rates and life history parameters were described by multiple regression equations. The results showed the first group has slow growth rate (0.034 yr-1
37
Lo, Men-Tzung, and 羅孟宗. "Statistical Analysis of Doppler Parameters Using Microbubbles." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/48962027881095908098.
Анотація:
博士國立臺灣大學
電信工程學研究所
92
The ultrasound system for drug delivery should provide the function to recognize the coming medicine carrier and destroy it to release the interior drug. Note that the contrast agent (i.e. microbubble) is adopted as the medicine carrier. Therefore, the goal of this study is to formulate two theorems about bubble detection and cavitation detection for drug delivery. The Doppler domain analysis for echoes backscattered from microbubbles is necessary, since in Doppler domain we only need to separate the microbubbles from the red cells rather than other tissues. In addition, the first step in the procedure for analyzing the Doppler data is to build the statistical model (such as autocorrelation function) of echoes, since the backscattering signals form the distributed microbubbles and red cells are random process. Under band limited transmission, it can be observed that beyond a critical frequency, the theoretical volume backscattering cross-section (power gain) derived from the ensemble average power spectrum of microbubbles decreases with frequency. On the contrary, the volume backscattering cross-section of red cells increases with frequency. The decreasing gain with frequency for distributed microbubbles is proved theoretically to result in the downward shift in estimated Doppler parameters after microbubble injection. If we increase the transmitted bandwidth, the variation in estimated Doppler parameters after microbubble injection will become more apparent, this benefits for bubble reorganization. The variations in Doppler parameters estimated with experimental data are presented to verify the theoretical deviations. Under the narrow band insonification for bubble cavitation, the appearance of the apparent subharmonics is proposed to the indication of cavitation in this study, since the onset threshold of the subharmonics is very high. If the onset threshold of the subharmonics is so high that it is close to the cavitation threshold, the observation time for the subharmonics will be very short; this is proved theoretically to result in the weak correlation of consecutive Doppler signals in this study. Therefore, the estimated Doppler signals for the subharmonics can be used to specify whether the appearance of subharmonics can be used to indicate the cavitation. Our numerical results demonstrated that the onset thresholds are indeed very close to the cavitation thresholds for most bubbles. Our experimental results carried out using the suspension of levoist® and free gas show that the correlation of two consecutive Doppler signals obtained form the apparent subharmonics is very weak. The experimental results also present that the weak correlation of Doppler signals should be accused of the excessively reduced observation time rather than the flow velocity spread.
38
Ou, Yih-Chang, and 歐益昌. "Effects of Implicit Parameters in Linkage Analysis." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/04284431853260284258.
Анотація:
博士國立臺灣大學
農藝學研究所
89
In human genetic analysis, data are collected through the so-called ‘ascertainment procedure’. Statistically this sampling scheme can be thought of as a multistage sampling method. At the first stage, one or several probands are ascertained. At the subsequent stages, a sequential sampling scheme is applied. Sampling in such a way is virtually a nonrandom procedure, which, in most cases, causes biased estimation which may be intractable. Three types of parameters, i.e., target, design and nuisance parameters, are defined as the essences to formulate the true, conditional and incomplete conditional likelihoods. These parameters are also classified into explicit or implicit parameters depending on whether they can be expressed explicitly in the likelihood function. These parameters are used to discuss about the intractability problem in this study. The intractability problem is attributed to loss of information of any implicit parameter in likelihood formulation and differ with the definitions of the likelihoods. Specifically, in this dissertation, the effect of implicit parameters on the estimation of recombination fraction in linkage analysis is discussed.
39
Chang, Wei-Chieh, and 張圍捷. "Study of Quadrotor UAVs Performance Parameters Analysis." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/40101389127334274274.
Анотація:
碩士淡江大學
航空太空工程學系碩士班
103
The progress of embedded controller performance and drop of sensors cost, encourage the development of quadrotor UAVs. But, no publication on the research of performance parameters of quadrotors is found. In the thesis, the performance parameters are studied. The momentum method is used to study the aerodynamic performance of rotors. Based on the results, the quadrotor performance parameters studied are thrust required, power required, climb rate, decent rate, range and endurance. The research assures the design of quadrotor UAV which satisfies requirements.
40
Yang, Chia-Ming, and 楊家鳴. "Design of Analysis System for Arteriosclerosis Parameters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/17689893827963872518.
Анотація:
碩士南台科技大學
資訊工程系
96
Cardiovascular diseases are always listed in ten major causes of death according to the statistical data of the Department of Health in recent years. There is a tendency towards increase each year. The pathological changes of Arteries are the major causes of the cardiovascular diseases. However, cardiovascular diseases are also listed in ten major causes of death according to the statistical data of the Department of Health about middle-aged people, which there is a tendency towards increase each year. Not only have the aged people suffered from cardiovascular diseases, but also middle-aged people should prevent the symptoms. The interface of the designed system includes the storage interface of physiological signal and the analysis interface of physiological signal. The storage interface of physiological signal can display and record the physiological signal that there are ECG, PCG and 4-channel PPG. Heart rate (HR) and pulse wave velocity (PWV) can be real-time calculated. The analysis interface of physiological signal can choose bilateral analysis, left-sided analysis or right-sided analysis in the optional mode. There are four advanced analysis mode can be setup. HR, PWV, Stiffness Index and Reflection Index can be analyzed by using the designed computer functions. The system can be used to evaluate the sclerosis characteristic of full-body arteries with a long-term record.
41
Wang, Shin-Yu, and 汪昰佑. "Steering system geometry design and parameters analysis." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/52874346394958251279.
Анотація:
碩士國立屏東科技大學
車輛工程系所
101
The purpose of this study is to propose a procedure for designing the steering system of LEV. First, we collect the designs parameters from the same level vehicle, and plan out the design process and application, then determine the best hard point design position of steering system by using Ackermann steering theory, Dixon theory, and Kennedy’s theorem. After that the model of suspension including the steering system have been created by using ADAMS/CAR, and the motion of parallel wheel travel and steering then be executed for explore its motion movement parameter variations. The computer simulation can be used to modify points for finding the ideal steering system geometry .By modified the hard points including knuckle, knuckle arm contacts point, the tie rod inner and tie rod outer, steering box position, etc., in the steering motion parameters can meet the expected range of motion parameters and effectively applied to suspension geometry institutions calibration and correction.
42
Ouarouer, Yosra. "Determination of kinetic parameters using Rancimat analysis." Master's thesis, 2017. http://hdl.handle.net/10198/19765.
Анотація:
The physicochemical quality parameters, the total phenols contents and the oxidative stabilities at 120 to 160 ºC of commercial extra-virgin olive oils were assessed, allowing to confirm the quality grade as well as to group them according to the total phenols contents as low (88±7 mg CAE/kg), medium (112±6 mg CAE/kg) and high (144±4 mg CAE/kg) phenols levels. The results pointed out that oils with higher total phenols contents were more thermally stable. Kinetic and thermodynamic parameters were determined using the activated complex/transition-state theory, showing that their values did not significantly differ for the two highest total phenols contents, suggesting a hypothetically threshold saturation of the beneficial effect. High total phenols content would imply a significant more negative temperature coefficient, higher temperature acceleration factor, greater activation energy and frequency factor, higher positive enthalpy of activation, lower negative entropy of activation and greater positive Gibbs free energy of activation. The results confirmed that the lipid oxidation was a non-spontaneous, endothermic and endergonic process with activated formed complexes structurally more ordered than the reactants. A negative deviation from the Arrhenius behavior was observed for all oils being the super-Arrhenius behavior more marked for oils with lower total phenols contents.Neste estudo foram avaliados os parâmetros de qualidade físico-químicos, os teores de fenóis totais e as estabilidades oxidativas na gama de 120 a 160 º C, de azeites comerciais virgem extra, permitindo confirmar a classificação de vrigem extra, bem como agrupá-los de acordo com teores totais de fenóis em baixo teor (88 ± 7 mg CAE/kg), médio teor (112 ± 6 mg CAE/kg) e elevado teor (144 ± 4 mg CAE/kg) de fenóis. Os resultados demonstraram que os azeites com maior teor de fenóis totais foram mais estáveis termicamente. Parâmetros cinéticos e termodinâmicos foram determinados com base na teoria do complexo/estado de transição ativado, mostrando que seus valores não diferiram significativamente para os azeites com maiores teores de fenóis totais. Azeites com um alto teor de fenóis totais possuiam um coeficiente de temperatura significativamente mais negativo, maior fator de aceleração de temperatura, maior energia de ativação e fator de freqüência, maior entalpia positiva de ativação, menor entropia negativa de ativação e maior energia livre de Gibbs. Os resultados confirmaram que a oxidação lipídica é um processo não-espontâneo, endotérmico e endérgico em que os complexos formados são estruturalmente mais ordenados do que os reagentes que lhes deram origem. Um desvio negativo ao comportamento de Arrhenius foi observado para todos os azeites estudados sendo o comportamento supra-Arrhenius mais notório para azeites com menor teor de fenóis totais.
43
Jhou, Hong-you, and 周鴻佑. "Comparative analysis of foot arch index parameters." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/24156221409222608673.
Анотація:
碩士國立中央大學
生物醫學工程研究所
99
Human foot''s structure is important regarding stands and walks. Abnormal foot state could make the lower limb easily weary and even lead to the pathological changes, resulting in unbalanced when walking. There are two common diseases: the flat foot and the high arch foot caused by abnormal arch height. Therefore, the arch height assessment of foot is essential in foot medical examination. There are many ways to detect arch height, including: x-ray examination, arch height measurement, footprint index parameters and foot pressure index (exp. Modified Arch Index; MAI) etc. In this study, we choose arch measurements, footprint index parameters (including AA, ALI, FI, TFI, SI, CSI and AI) and MAI with image processing and automated measurement system for detection as they are easy to access and the equipments are relatively cheap. 33 participants with a complete footprint and without any foot pathological history were assumed to be normal and recruited in this study to give a total of 66 samples of footprints (22 male, 11 female, average height in 169±6.7cm, weight in 64±12.3 kg, age in 23±3 years). This is the normal control group. In addition, 10 participants with flat foot (8 male, 2 female; a total of 20 samples of footprints) and 10 participants with high arch foot (4 men, 6 women, a total of 20 samples of footprints) were recruited as the contrast group. The arch height, seven footprint index parameters and MAI were measured and compared between groups and with data from literatures for cross validation in order to identify the best detection method. The empirical results of the foot arch height detection experiments show that the average foot arch heights are 4.03±0.82, 2.45±0.14 and 5.47±0.26 cm for normal, flat foot and high arch foot, respectively. The parameters that can best represent the arch height (highest correlation) is MAI. The situation of MAI of normal foot which is 26%~30% on the middle foot, the distribution is uniform. The flat foot which is 33%~37% on the middle foot, the main distribution is on the middle foot. The high arch foot which is 18%~22% on the middle foot, the main distribution is on the front foot and the heel. Among seven footprint index parameters, the Arch Index (AI) is most correlated with arch height and Arch Length Index (ALI) is lowest. Furthermore, the two-dimensional area ratio parameters (FI and TFI) are more related with arch height than one-dimensional length ratio parameters (SI and CSI). In conclusion, we have indentified the best examine method: MAI among methods tested for abnormal arch height detection. As the method is capable of detecting abnormal foot arch and can provide useful and reliable information, we believe that it could predict the arch height before clinical x-ray foot arch examination.
44
LAI, KUAN-TING, and 賴冠廷. "Analysis of Mold Displacement by Process Parameters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/60046351747216152790.
Анотація:
碩士逢甲大學
機械與電腦輔助工程學系
105
Produce a set of molds need to about 30 days, but life cycle of the product becomes shorter and shorter, the manufacturing schedule was also shortened. This research expect to use numerical simulation program to find the mold production situation when the mold design was completed, it can save the try and error. This research used thermo-solid coupling because the heat effect is large. Form the analysis results, clamping force has a large effect on the plate, and the effect on the core is injection pressure and temperature. We add the gasket to improve the slide displacement, and we find add 10μm of gasket can improve about 0.1μm. We also found change the material parameters is a large impact on the analysis. It can be observed that some parts have stress concentration problems, it may cause the product failure because the part and part can not contact tight. If the problem can be found when we design the mold, it can save the time to fix.
45
Cheng, Yen-Chun, and 程彥鈞. "Thermokinetic Parameters Analysis for Tert-Butyl Peroxybenzoate." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/51967943672693991226.
Анотація:
碩士雲林科技大學
環境與安全工程系碩士班
97
Effects of time, temperature, and heat of decomposition (ΔHd) of tert–butyl peroxybenzoate (TBPB) and TBPB mixed with benzoyl peroxide (BPO) on the thermal analysis by using chamber furnace, thermal activity monitor III (TAM III), and differential scanning calorimetry (DSC) were investigated. Typically different ratios of TBPB mixed with BPO are employed to cure an unsaturated polyester resin. Both TBPB and BPO had high ΔHd more than 1,000 J g–1. Afterwards, TBPB mixed with BPO could have higher ΔHd. The higher ΔHd in the decomposition reaction, the greater the degree of thermal hazard. Therefore, this study assessed the thermokinetic parameters of TBPB and TBPB mixed with BPO, such as activation energy (Ea=106.9–144.4kJ mol–1), frequency factor (A=6.054×1014 min–1), exothermic onset temperature (T0=73.25–99.51oC), etc., with other safety parameters for TBPB and TBPB mixed with BPO.
46
Tseng, Hsiao-Sheng, and 曾孝生. "Phases Analysis of 200m Sprinting Speed Parameters." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/99071584875769142856.
Анотація:
碩士國立體育大學
教練研究所
100
The purpose of this study was to analyze the combination and changes among stride length, stride frequency, averaged speed of per 20 meters running in 200m sprint, and then to investigate the sprint athletes’ speed performance of the whole trip. We further understand the relations among the explosive, legs length, and grades of the athletes by analyzing the relations among stride length, stride frequency, and averaged speed. 14 male sprint athletes were recruited in this study as subjects and their averaged age, grade, height, weight, and legs length are 17.36±1.84 years old, 24.79±.89 seconds, 174.64±5.28 centimeters, 64.93±5.18 kilograms, and 94.43±3.85 centimeters. We applied Ariel Performance Analysis System to capture the image data for this study and proceeded to analyze the data we got with SPSS 12.0 for Windows suited package software. The collected data were analyzed by descriptive statistics and we used Pearson product moment correlation to test the relation among stride length, stride frequency, averaged speed, and the relation among explosive, legs length, and grade of every 20 meters. The level of significance was α＝.05. Results： 1. The longest stride length, 2.27meters per stride, occurred during 60m-80m part and the fast stride frequency, 4.23 seconds per stride, occurred during 20m-40m part. The distribution of speed was a single peak pattern and the maximal speed, 9.14 meters per second, occurred during 60m-80m part. 2. Stride lengths and stride frequencies in whole 200m sprint are negatively related which showed stride length and stride frequency interact. When the length enlarges, the frequency will decrease and when the frequency increases, the length will decrease. 3. Stride frequency and speed are positively related which indicated the vital relation between speed and frequency of stride. The action of frequency is more important than length, so the stride frequency is one key factor which affects the speed. 4. Explosive and grade performance of the subjects are negatively related which shows the worse of the athlete’s grade is, the worse explosive of the athletes will be. In addition, explosive and speed are positively related, which shows the better the explosive is, the performance of speed will be better as well. 5. Height and legs length of the subjects are positively related which shows the higher who is, the longer length of legs who will have. Furthermore, the relation among height, legs length, and stride length are positive which indicates the vital relation between height, leg lengths, and stride length. Both are important factors which affect the action of stride length.
47
Chen, Guan-Hao, and 陳冠豪. "Analysis of FMD 3D Print Quality Parameters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9m77zs.
Анотація:
碩士國立勤益科技大學
機械工程系
105
Nowdays the 3D printing is a developed technology on usage.Many manufacturers are using 3D printing to fribricate parts directly in order to save the cost of mold.Therefore, the 3D printing make trend on large numbers of customization. The 3D printing makes processing a multi-functional composite.The Fused Deposition Modeling (FDM) and other processing equipment has become one of the mainstream market products. The 3D printing of FDM device type in addition to the difference between equipment and structure, the manufacturing principle is the same, but the same machine has a print quality is not the same, print can not attain the conditions. For the end of users, operators still need to use trial and error method that making their product to fulfill their design. It can’t truly reach the way of fast prototyping, even do the shorten development time. In this experiment, the use of several key parameters that affect print quality, such as, the extrusion temperature, print speed and cooling, design models to simulate the problems encountered in the printing process, and provide reference for the finished product parameters. And then, shorten of the FDM development time and achieve the purpose, in accordance with the requirements encountered in the print request to modify the parameters.
48
CHANG, CHUN-CHIEH, and 張俊傑. "Synthesis Parameters and Characteristic Analysis of Tetracene." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bbnsx2.
Анотація:
碩士國防大學理工學院
化學工程碩士班
106
Tetracene has good impact sensitivity, safe and highly reliable primer sensitizer, which is one of the commonly used components of the impact primer powder. It is mixed with lead styphnate, antimony(III) sulfide, barium nitrate and other substances to become the basic formula for impact primers. In this study, Taguchi experimental design method was used to explore the most suitable parameters for the formation of tetracene. Six experimental conditions were designed by five control factors and four levels of L16(45) orthogonal table. The experimental data were converted to S/N (Signal-to-Noise ratio) value, the experimental parameters of the maximum yield of tetracene were obtained through the analysis and evaluation. The verification results showed that the best synthesis conditions were obtained, and the maximum tetracene yield was 83.7%. In addition, the use of differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD), optical microscope, laser diffraction particle size analyzer and drop hammer impact tester and other instruments analyze the characteristics to establish the relationship between the particle size and shape of tetracene and its thermal characteristics and sensitivity.
49
Kim, Dongsoo. "Estimation of analysis parameters in optimum interpolation and variational objective analysis." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19059241.html.
Анотація:
Thesis (Ph. D.)--University of Wisconsin--Madison, 1988.Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 153-158).
50
Lo, Chi Ching, and 盧志清. "Uncertainly Analysis of Reinforced Concrete Buildings Model Parameters." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/78986054025791117091.