• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 17727
  • 5465
  • 2960
  • 2657
  • 1693
  • 1648
  • 1013
  • 877
  • 762
  • 549
  • 306
  • 286
  • 279
  • 257
  • 175
  • Tagged with
  • 42499
  • 4369
  • 3931
  • 3786
  • 2870
  • 2498
  • 2436
  • 2330
  • 2166
  • 2045
  • 2028
  • 1978
  • 1957
  • 1931
  • 1881
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
961

Utilização do active shape model para análise de imagens médicas: localização do pulmão de crianças em radiografias para auxiliar no diagnóstico de pneumonia / Using the active shape model for medical image analysis: locating the lung of children on radiographs to assist in the diagnosis of pneumonia

Freire Sobrinho, Paulo 13 April 2017 (has links)
Submitted by JÚLIO HEBER SILVA (julioheber@yahoo.com.br) on 2017-05-11T19:49:56Z No. of bitstreams: 2 Dissertação - Paulo Freire Sobrinho - 2017.pdf: 10088390 bytes, checksum: 93cbaefd8f5c2dc974201729c2e859f7 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-05-15T11:30:14Z (GMT) No. of bitstreams: 2 Dissertação - Paulo Freire Sobrinho - 2017.pdf: 10088390 bytes, checksum: 93cbaefd8f5c2dc974201729c2e859f7 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-05-15T11:30:14Z (GMT). No. of bitstreams: 2 Dissertação - Paulo Freire Sobrinho - 2017.pdf: 10088390 bytes, checksum: 93cbaefd8f5c2dc974201729c2e859f7 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-04-13 / Contextualization: Technologies like CAD systems, become ideal as a second opinion, that is, to work in partnership with the doctor. For example, PneumoCAD can be used to perform a diagnosis of absence or absence of pneumonia in children 1 to <5 years of age using X-ray radiographs. Problems: However, the use of PneumoCAD requires a region of interest, referring to the lungs, manually. Based on difficulty and difficulty, we sought a solution that was not found in any research, applied to radiographs, involving PneumoCAD, through the active model, having as a patient children between the ages of 1 and <5 years. Proposal: It is then proposed the use of the active model, associated with the technique developed and called nsAlterar in improvement to segmentation based on ns . Materials and Methods: Fifty-six “padrão ouro” radiographs were submitted to MATLAB, in 8 steps, through modified and improved algorithms, as well as implemented support tools, such as: As well as measures of similarity to investigate quantitatively , On an efficiency of all resources employed for the same purpose. Results: With this question, we obtained, after an analysis of the experiments, a taxon of hits for the right of spraying 75.61% and for the left one in 63.41%, in which nsAlterar promoted the improvement in the distributions, even if They were not segmented correctly, through approximations properly. Conclusions: Based on the active model associated with nsAlterar and other resources, it was possible to complement a functionality of the PneumoCAD system, through the use of segmentation in reais, thus contributing to a higher efficiency and better results. / Contextualização: As tecnologias como sistemas CAD, tornam-se ideais como segunda opinião, ou seja, para trabalhar em parceria com o médico. Por exemplo, o PneumoCAD pode ser utilizado para realização do diagnóstico de ausência ou não de pneumonia em crianças de 1 e < 5 anos de idade, através das radiografias de raios-X. Problemática: Entretanto, a utilização do PneumoCAD exige que uma região de interesse, referente aos pulmões, sejam determinadas manualmente. Baseado nesta exigência e dificuldade buscou-se alguma solução que não foi encontrada em nenhuma pesquisa, aplicada a radiografias, envolvendo o PneumoCAD, através do Active Shape Model, tendo como paciente crianças com idade entre 1 e < 5 anos. Proposta: É, então, proposto o uso do Active Shape Model, associado à técnica desenvolvida e denominada nsAlterar em melhora à segmentação baseada no ns . Materiais e Métodos: Foram submetidas, no MATLAB, 56 amostras de radiografias do “padrão-ouro”, em 8 etapas, através de algoritmos modificados e aperfei- çoados, além de ferramentas implementadas de apoio, como: para o treinamento a partir de exemplos; assim como as medidas de similaridades para buscar investigar, de maneira quantitativa, sobre a eficiência de todos os recursos empregados para o mesmo propósito. Resultados: Com isto, foi obtida, após a análise dos experimentos, a taxa de acertos para o pulmão direito em 75,61% e para o esquerdo em 63,41%, em que o nsAlterar promoveu o melhoramento nas distribuições, mesmo as que não foram segmentadas corretamente, através de aproximações de maneira adequada. Conclusões: A partir do Active Shape Model associado ao nsAlterar e demais recursos, foi possível complementar a funcionalidade do sistema PneumoCAD, através do uso da segmentação em situações reais, contribuindo, assim, para a obtenção de maior eficiência e de melhores resultados.
962

Návrh controllingové koncepce s využitím systému "Business intelligence" / Designing a controlling concept using the business intelligence system

Hejdánek, Michal January 2017 (has links)
The Master Thesis deals with the use of the controlling concept in business management, Business Intelligence systems and their interconnection. The aim is to propose this integration link on the example of a particular company and at the same time to give management recommendations in areas that will be evaluated in the analysis as insufficient. The theoretical part of this thesis is divided into three main chapters. The first deals with the definition of controlling, its tools and organizations. The second one describes business intelligence, not just the basic principles of this technology, but also the choice of tools and the implementation process are explained. The following chapter lists two software tools that combine controlling and business intelligence in practice. The practical part is divided into a general description of the company, analysis of the applied elements of controlling and then the proposal of solution of insufficient areas and the process of BI implementation, which contains 12 steps which would enable to implement the BI concept.
963

Essays in housing and macroeconomy

Huang, Haifang 05 1900 (has links)
Compared to the previous twenty years, residential investments in the US appear more stable after the mid-1980s. Chapter 2 explores key hypotheses regarding the underlying causes. In particular, it uses estimated DSGE models to examine whether a more responsive interest rate policy stabilizes the housing market by keeping inflation in check. These estimations indeed found a policy that has become more responsive over time. Counter-factual analysis confirms that the change stabilizes inflation as well as nominal interest rate. It does not, however, find the change in policy to have stabilizing effect on real economic activity including housing investment. It finds that smaller TFP shocks make modest contributions, while the biggest contributing factor to the fall in the housing volatility is a reduction in the sensitivity of the investment to demand variations. Chapter 3 constructs a richly specified model for the housing market to examine the empirical relevance of various costs and frictions, including the investment adjustment cost, sticky construction costs, search frictions, and sluggish adjustment of house prices. Using the US national-level quarterly data from 1985 and 2007, we find that the gradual adjustment of house prices is the most important and irreplaceable feature of the model. The key to developing an optimization-based empirical housing model, therefore, is to provide a structural interpretation for the slow adjustment in house prices. Chapter 4 uses US national-level time series of residential investment, price index of new houses, consumption and interest rate to explore whether the US, as a nation, experienced a drop in the price elasticity of supply of new housing. Maximum likelihood estimations with a simple stock-and-flow model found a statistically significant drop of the elasticity from 10 to 2.2, when the quarterly data between 1971 and 2007 are split at 1985. A richer model with mechanisms of gradual adjustment also indicates such a reduction, when existing knowledge about the adjustment parameters is incorporated in the analysis. For the Federal Reserve, an inelastic supply can be a source of concern, because policy-driven demand in housing market is more likely to trigger undesirable swings in prices. / Arts, Faculty of / Vancouver School of Economics / Graduate
964

Hydrodynamics of Balistiform swimming in the Picasso Triggerfish, Rhinecanthus aculeatus

Loofbourrow, Hale 05 1900 (has links)
Aquatic propulsion by means of undulatory movements of the median (dorsal and anal) fins is the primary mode of transport for the Picasso triggerfish (Rhinecanthus aculeatus). Known as balistiform locomotion, this form of propulsion is an adaptation for highly efficient movement within complex environments such as coral reefs. A principle component of balistiform locomotion has been the development of momentum enhancement, a fin-force multiplier that increases swimming efficiency. This study examines the kinematics and energetics of balistiform locomotion employing theoretical models of thrust, power, and efficiency. Thrust and power were calculated and compared with theoretical values modeled by Lighthill and Blake (1990). This model has heretofore not been thoroughly vetted and was tested for accuracy and applicability. Thrust force was estimated from resistance (drag) using a vertical dead drop to determine terminal velocity; power was calculated from oxygen consumption measurements at different speeds. The Lighthill and Blake (1990) model requires median fin kinematics (frequency, wavelength, amplitude, wave angle), which were measured from high-speed videography and followed statistically predicted trends with frequency being the dominant variable, and the others changing little or not at all with speed. Momentum enhancement was found to be 3.6, close to Lighthill and Blake’s (1990) theoretically predicted value of 2.5. Momentum enhancement is experimentally proven here for the first time. Theoretical and empirical thrust force values are closely matched; theoretical thrust is greater at lower speeds and lower at higher speeds. The ratio of theoretical thrust to drag-estimated thrust averages 1.08. Theoretical values for power are greater than those measured by a factor of about 3.6 and cannot be explained by measurement error. / Science, Faculty of / Zoology, Department of / Graduate
965

Raising support for potable recycled water with the elaboration likelihood model

Tan, Li Qin 19 April 2018 (has links)
In spite of modern technological advancements that can convert wastewater into potable water, the acceptability of recycled water is generally low. This study examined strategies for increasing the public acceptability of recycled water. Based on the elaboration likelihood model, I hypothesized that issue relevance, argument quality, and delivery type would interact to produce differing levels of support for potable recycled water. Undergraduate students took part in a 2 (issue relevance: low, high) x 2 (argument quality: weak, strong) x 2 (delivery: textual, pictorial) online study relating to their opinion and support for the potential implementation of a potable recycled water system on campus. Issue relevance was manipulated by varying the completion date of implementing the system (low: five years; high: one year). Argument quality was manipulated by varying the complexity of the message presented (weak: point-form; strong: paragraph form). Delivery was manipulated by presenting water recycling processes in a textual or pictorial format. The hypotheses were not supported, although the means were in the predicted direction. Limitations and future directions are discussed. / Graduate
966

An empirical analysis of factor seasonalities

Li, Ya 22 August 2017 (has links)
I establish the existence of seasonality in 42 popular risk factors in the asset pricing literature. I document extensive empirical evidence for the Keloharju et al. (2016) hypothesis that seasonalities in individual asset returns stem from their exposures to risk factors. It is the seasonal patterns in risk factors that lead to the seasonalities in individual asset portfolios. The empirical findings show that seasonalities are widely present among individual asset portfolios. However, both the all-factor model and the Fama-French (2014) five-factor model demonstrate that these patterns greatly disappear after I eliminate their exposures to the corresponding risk factors. Overall, 76.17% of the returns on 235 test equal-weighted portfolios I examine contain seasonality. My key finding is that 48.68% of equal-weighted portfolio returns with seasonalities no longer contain seasonality after I control for their exposures to all risk factors. Only 52.08% of the equal-weighted portfolio Fama-French five-factor model residual obtain substantial seasonal patterns in the Wald test. Regarding to seasonalities in risk factors, specific seasonal patterns include the January effect, higher returns during February, March, and July, and autocorrelations at irregular lags. The Wald test, a stable seasonality test, the Kruskal-Wallis chi-square test, a combined seasonality test, Fisher's Kappa test, and Bartlett's Kolmogorov-Smirnov test are used to identify the seasonal patterns in individual risk factors. Fama-French SMB (the size factor) and HML (the value factor) in the three-factor model, Fama-French RMW (the operating profitability factor) in the five-factor model, earnings/price, cash flow/price, momentum, short-term reversal, long-term reversal, daily variance, daily residual variance, growth rate of industrial production (value-weighted), term premium (equal-weighted and value-weighted), and profitability display robust seasonalities. Therefore, the first part of the research confirms that risk factors possess substantial seasonal patterns.
967

Development of A Practical Model for Pavement Management Systems / 道路舗装マネジメントシステム普及のための実践的モデル

Hamzah Suharman 26 March 2012 (has links)
Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第16818号 / 工博第3539号 / 新制||工||1535(附属図書館) / 29493 / 京都大学大学院工学研究科都市社会工学専攻 / (主査)教授 小林 潔司, 教授 大津 宏康, 教授 河野 広隆 / 学位規則第4条第1項該当
968

1219 Colorado

Spaw, Christopher Alan January 1900 (has links)
Masters of Architecture / Landscape Architecture/Regional and Community Planning / 1219 Colorado is the documentation of the nonlinear process of design as it applies to the reconfiguration of a residential dwelling. This process is illustrated through a collection of sketches, design drawings, construction documents and images produced from 1999 to 2005. 1219 Colorado investigates materiality the physical substance of architecture, as well as the nature of thoughtful connection physical and theoretical through the process of making. The need to build, to make, to design, and explore is what drives the process. While the space of architecture is most often designed and perceived as lines on paper, it is through the making of physical models that the creative act of discovery reveals its greatest potential. The process explores the design of a model constructed at full-scale. No longer representational, the study is the product; the materials and methods are genuine. This process differs from the process of building in that the intention is no longer to construct only that which is designed. Rather the challenge is to explore beyond the design, reveal new possibilities, refine design decisions, and most importantly to take advantage of unforeseen opportunities that are revealed through the act of making. The scope of the task expanded periodically as a function of increasing knowledge of construction, declining acceptance of the quality of the existing condition and in order to accommodate an evolving set of programmatic requirements. To date the construct has under gone no less than three different design schemes, and a fourth will follow as the process continues to be refined and reconsidered. The project continues to evolve, grow, and change directions. 1219 Colorado explores design is not a linear process. Architecture is not always pretty.
969

Modeling and construction of a computer controlled air conditioning system

Frink, Brandon S. January 1900 (has links)
Master of Science / Department of Mechanical and Nuclear Engineering / Warren N. White / As energy efficient devices become more necessary, it is desired to increase the efficiency of air conditioning systems. Current systems use on/off control, where the unit primarily operates in the long lasting start up transients. A proposed solution is an air conditioning unit that runs continuously with active computer control implemented to maximize efficiency. The objective of this thesis is to develop a mathematical model for a specific air conditioning unit and to compare this model to measurements made on the specific unit. This model can then be used to develop a multi-input multi-output control law in the future. In this thesis, a linearized moving interface lumped parameter model is presented, and the derivation verified with great detail. The model predicts transient perturbations from a steady state operating point. The air conditioner tested in this work required several modifications including the addition of sensors and controllers. A description of the system is provided. Methods used to determine all of the parameters for the model are given with explanation. The model is simulated with computer software and compared with experimental data. Simulations predict the final value of superheat and pressures in the evaporator and condenser well for step changes in the compressor speed and expansion valve opening.
970

A Needs Assessment for the Perioperative Surgical Home Model

Rambo, Mayka L., Rambo, Mayka L. January 2017 (has links)
The United States is ranked first for health care expenditure and 11th for quality of care. Surgical care is complex, multifactorial, and medical expenses continue to increase. The necessity for surgery normally disconnects the patient from their primary care provider, frequently resulting in uncoordinated care between medical providers regarding surgical care. A fragmented healthcare system results in unnecessary diagnostic labs and tests, insufficient surgical care resources, and patients experiencing a lapse in their medical care. If adopted, the Perioperative Surgical Home (PSH) model has the opportunity to improve patient outcomes by increasing patient satisfaction rates while decreasing surgical complications and hospital stay duration. The PSH model is patient-centered, and directed by anesthesia providers coordinating surgical care by adequately optimizing patients for surgery. The five model components are: patient involvement, comprehensiveness, coordination of care, accessibility, and commitment to quality and safety. Purpose: The purpose of this project was to perform a needs assessment at a Central Phoenix Hospital to identify if there was a need to implement the PSH model to decrease surgical complications and 30-day surgical hospital readmission rates. Methods: This was a non-experimental needs assessment. Retrospective data collection was used to explore and identify if the PSH model was needed at this Phoenix hospital. A needs assessment tool was created guided by the Rothwell and Kazana's needs assessment model utilizing their five key phases. The General Systems Theory was used to assess the complexity of an open surgical system to identify gaps in performance and results. Results: Data collected from fiscal year 2015 demonstrated a total of 7,829 surgical cases were performed at this hospital. The number of patients with a surgical complication was 826 (10.6%). A reported 147 (1.9%) patients had a surgical hospital readmission at this facility. Data from fiscal year 2016 demonstrated 7,778 (10.3%) total surgical cases. The number of surgical complications reported was 800 (1.5%). A reported 116 patients had a hospital surgical readmission at this facility. Conclusion: The reported high health care expenditure and low quality of care received in the U.S. supports the need to improve our health care delivery system with models such as the PSH. There was not an obvious problem in performance of surgical complications and 30-day surgical hospital readmission rates. There were identified system gaps in data collection of surgical reporting that correlate with clinical practice. These findings were the starting point for a needs analysis to follow by focusing on development and implementation of the PSH model if adopted.

Page generated in 0.0868 seconds