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Tan, Falong. "Projected adaptive-to-model tests for regression models." HKBU Institutional Repository, 2017. https://repository.hkbu.edu.hk/etd_oa/390.
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This thesis investigates Goodness-of-Fit tests for parametric regression models. With the help of sufficient dimension reduction techniques, we develop adaptive-to-model tests using projection in both the fixed dimension settings and the diverging dimension settings. The first part of the thesis develops a globally smoothing test in the fixed dimension settings for a parametric single index model. When the dimension p of covariates is larger than 1, existing empirical process-based tests either have non-tractable limiting null distributions or are not omnibus. To attack this problem, we propose a projected adaptive-to-model approach. If the null hypothesis is a parametric single index model, our method can fully utilize the dimension reduction structure under the null as if the regressors were one-dimensional. Then a martingale transformation proposed by Stute, Thies, and Zhu (1998) leads our test to be asymptotically distribution-free. Moreover, our test can automatically adapt to the underlying alternative models such that it can be omnibus and thus detect all alternative models departing from the null at the fastest possible convergence rate in hypothesis testing. A comparative simulation is conducted to check the performance of our test. We also apply our test to a self-noise mechanisms data set for illustration. The second part of the thesis proposes a globally smoothing test for parametric single-index models in the diverging dimension settings. In high dimensional data analysis, the dimension p of covariates is often large even though it may be still small compared with the sample size n. Thus we should regard p as a diverging number as n goes to infinity. With this in mind, we develop an adaptive-to-model empirical process as the basis of our test statistic, when the dimension p of covariates diverges to infinity as the sample size n tends to infinity. We also show that the martingale transformation proposed by Stute, Thies, and Zhu (1998) still work in the diverging dimension settings. The limiting distributions of the adaptive-to-model empirical process under both the null and the alternative are discussed in this new situation. Simulation examples are conducted to show the performance of this test when p grows with the sample size n. The last Chapter of the thesis considers the same problem as in the second part. Bierens's (1982) first constructed tests based on projection pursuit techniques and obtained an integrated conditional moment (ICM) test. We notice that Bierens's (1982) test performs very badly for large p, although it may be viewed as a globally smoothing test. With the help of sufficient dimension techniques, we propose an adaptive-to-model integrated conditional moment test for regression models in the diverging dimension setting. We also give the asymptotic properties of the new tests under both the null and alternative hypotheses in this new situation. When p grows with the sample size n, simulation studies show that our new tests perform much better than Bierens's (1982) original test.
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Moffett, Jeffrey P. "Applying Causal Models to Dynamic Difficulty Adjustment in Video Games." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/320.
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We have developed a causal model of how various aspects of a computer game influence how much a player enjoys the experience, as well as how long the player will play. This model is organized into three layers: a generic layer that applies to any game, a refinement layer for a particular game genre, and an instantiation layer for a specific game. Two experiments using different games were performed to validate the model. The model was used to design and implement a system and API for Dynamic Difficulty Adjustment(DDA). This DDA system and API uses machine learning techniques to make changes to a game in real time in the hopes of improving the experience of the user and making them play longer. A final experiment is presented that shows the effectiveness of the designed system.
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Garratt, Dean. "Qualifying political business cycle models : the partisan indicator model." Thesis, University of Leicester, 1996. http://hdl.handle.net/2381/35483.
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The thesis begins by considering the established political business cycle models. There are five such models: (i) the pure political business cycle; (ii) strong partisan theory; (iii) conventional weak partisan theory; (iv) rational partisan theory; and (v) the rational political business cycle. We consider carefully the assumptions upon which these models are based, particularly their modelling of the government's objective function. This function is typically characterised as either opportunistic or ideological. Only conventional weak partisan theory attempts to analyse the switch mechanism between opportunism and ideology. There is little empirical evidence to support the belief that either opportunism or ideology alone has consistently affected economic outcomes and general government expenditures in the UK. Therefore, we focus on the trade-off between opportunism and ideology and its effect on UK general government expenditures. We argue that in modelling the switch between opportunism and ideology we need to consider the components of a re-election index as well as a series of qualifying indicators. These combine to define values of a qualified differential. We, therefore, develop the partisan indicator model. We stress that political business cycle theorists need to consider carefully what is meant by politically expedient behaviour. The creation of cycles need not equate with political expedience. Our other main concern is the effect of economic and political interdependencies between nations, not only on the implications of established political business cycle models, but also on the partisan indicator model. Therefore, political business cycle theorists need to look at an internationalisation of the literature.
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Schnücker, Annika [Verfasser]. "Model Selection Methods for Panel Vector Autoregressive Models / Annika Schnücker." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1176708147/34.
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Camehl, Annika [Verfasser]. "Model Selection Methods for Panel Vector Autoregressive Models / Annika Schnücker." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1176708147/34.
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di, Iorio Angelo <1977>. "Pattern-based segmentation of digital documents: model and implementation." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/370/.
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This thesis proposes a new document model, according to which any document can be segmented in some independent components and transformed in a pattern-based projection, that only uses a very small set of objects and composition rules. The point is that such a normalized document expresses the same fundamental information of the original one, in a simple, clear and unambiguous way. The central part of my work consists of discussing that model, investigating how a digital document can be segmented, and how a segmented version can be used to implement advanced tools of conversion. I present seven patterns which are versatile enough to capture the most relevant documents’ structures, and whose minimality and rigour make that implementation possible. The abstract model is then instantiated into an actual markup language, called IML. IML is a general and extensible language, which basically adopts an XHTML syntax, able to capture a posteriori the only content of a digital document. It is compared with other languages and proposals, in order to clarify its role and
objectives. Finally, I present some systems built upon these ideas. These applications are evaluated in terms of users’ advantages, workflow improvements and impact over the overall quality of the output. In particular, they cover heterogeneous content management processes: from web editing to collaboration (IsaWiki and WikiFactory), from e-learning (IsaLearning) to professional printing (IsaPress).
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Faria, Carla Gomes de. "UMA TÉCNICA PARA A AQUISIÇÃO E CONSTRUÇÃO DE MODELOS DE DOMÍNIO E USUÁRIOS BASEADOS EM ONTOLOGIAS PARA A ENGENHARIA DE DOMÍNIO MULTIAGENTE." Universidade Federal do Maranhão, 2004. http://tedebc.ufma.br:8080/jspui/handle/tede/340.
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Previous issue date: 2004-02-06This work proposes GRAMO, a technique for the acquisition and construction of ontology based domain and user models in Domain and User Analysis of Multi-Agent Domain Engineering. A domain model is a high-level domain independent abstraction representing the formulation of a problem, knowledge or activities of the real word. A user model is a high-level domain independent abstraction representing features, needs, preferences and goal of end-users. Ontologies are knowledge representation structures appropriate for representing domain and user models. GRAMO is based on the reuse of ONTODUM, a meta-domain and user model representing the knowledge of techniques for domain analysis, user modelling and requirement analysis of multi-agent systems. Two case studies in the juridical and touristical area are introduced describing a preliminar evaluation of the proposed technique.
Este trabalho propõe a GRAMO, uma técnica para a aquisição e construção de modelos de domínio e usuários baseados em ontologias para a Análise de Domínio e Usuários na Engenharia de Domínio Multiagente. Um modelo de domínio é uma representação dependente de um domínio de aplicação particular, especificada em um alto nível de abstração, que contém a formulação de um problema, conhecimento ou atividades do mundo real. Um modelo de usuário é uma abstração especificada em um alto nível, que representa as características, necessidades, preferências e objetivos dos usuários finais. Ontologias são estruturas de representação de conhecimento adequadas para representar modelos de domínio e usuários. A GRAMO é baseada no reuso da ONTODUM, um meta-modelo de domínio e usuários, que representa o conhecimento das técnicas da análise de domínio, modelagem de usuários e análise de requisitos de sistemas multiagente. Dois estudos de caso nas áreas jurídica e turística são apresentados descrevendo uma avaliação preliminar da técnica proposta.
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Pape, Markus [Verfasser]. "Model Identification in Bayesian Analysis of Static and Dynamic Factor Models / Markus Pape." Kiel : Universitätsbibliothek Kiel, 2015. http://d-nb.info/1070218715/34.
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Hahn, Christoph. "Eine CarSharing-Zielgruppenanalyse der großen SrV-Vergleichsstädte." Master's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-185088.
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Due to enormous growth rates during the last couple of years CarSharing has become an interesting field of research. This Master Thesis focuses on the analysis of CarSharing users. For this purpose more than 37.000 participants of the "Große SrV-Vergleichsstädte"-Survey were taken into account. After a short literature review and some general information about the statistical methods, the thesis tries to work out some major characteristics of the typical CarSharing user. It will be shown, that a high income and a young age are of central importance. Also when analysing other variables different user quotas are observed, but can mostly be explained with different age or income levels. At the end a binary logit model is sugested to differ between users and non users, by using the previous analysed observed characteristics as input.
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Daron, Joseph David. "Examining the decision-relevance of climate model information for the insurance industry." Thesis, London School of Economics and Political Science (University of London), 2012. http://etheses.lse.ac.uk/380/.
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The insurance industry is becoming increasingly exposed to the adverse impacts of climate variability and climate change. In developing policies and adapting strategies to better manage climate risk, insurers and reinsurers are therefore engaging directly with the climate modelling community to further understand the predictive capabilities of climate models and to develop techniques to utilise climate model output. With an inherent interest in the present and future frequency and magnitude of extreme climate-related loss events, insurers rely on the climate modelling community to provide informative model projections at the relevant spatial and temporal scales for insurance decisions. Furthermore, given the high economic stakes associated with enacting strategies to address climate change, it is essential that climate model experiments are designed to thoroughly explore the multiple sources of uncertainty. Determining the reliability of model based projections is a precursor to examining their relevance to the insurance industry and more widely to the climate change adaptation community. Designing experiments which adequately account for uncertainty therefore requires careful consideration of the nonlinear and chaotic properties of the climate system. Using the well developed concepts of dynamical systems theory, simple nonlinear chaotic systems are investigated to further understand what is meant by climate under climate change. The thesis questions the conventional paradigm in which long-term climate prediction is treated purely as a boundary value problem (predictability of the second kind). Using simple climate-like models to draw analogies to the climate system, results are presented which support the emerging view that climate prediction ought to be treated as both an initial value problem and a boundary condition problem on all time scales. The research also examines the application of the ergodic assumption in climate modelling and climate change adaptation decisions. By using idealised model experiments, situations in which the ergodic assumption breaks down are illustrated. Consideration is given to alternative model experimental designs which do not rely on the assumption of ergodicity. Experimental results are presented which support the view that large initial condition ensembles are required to detail the changing distribution of climate under altered forcing conditions. It is argued that the role of chaos and nonlinear dynamic behaviour ought to have more prominence in the discussion of the forecasting capabilities in climate prediction.
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Rauch, Isabel [Verfasser]. "Lebensformenneutralität in der niederländischen Familienbesteuerung - Modell für Deutschland? / Isabel Rauch." Aachen : Shaker, 2006. http://d-nb.info/1170535828/34.
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Nitzsche, Eric. "Analyse von verkehrs- und klimabezogenen Politikmaßnahmen in einer Stadtökonomie." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-202866.
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Die Dissertation befasst sich mit der Erweiterung und Anwendung des allgemeinen räumlichen Gleichgewicht- und Transportmodells RELU-TRAN (Anas und Liu, 2007) und analysiert verschiedene verkehrs- und klimabezogene Politikmaßnahmen (Tempo-30 in Städten, Infrastrukturqualität, Anpassung an den Klimawandel) in einer Stadtökonomie.
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Huang, Zhongdong. "RULES BASED MODELING OF DISCRETE EVENT SYSTEMS WITH FAULTS AND THEIR DIAGNOSIS." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/340.
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Failure diagnosis in large and complex systems is a critical task. In the realm of discrete event systems, Sampath et al. proposed a language based failure diagnosis approach. They introduced the diagnosability for discrete event systems and gave a method for testing the diagnosability by first constructing a diagnoser for the system. The complexity of this method of testing diagnosability is exponential in the number of states of the system and doubly exponential in the number of failure types. In this thesis, we give an algorithm for testing diagnosability that does not construct a diagnoser for the system, and its complexity is of 4th order in the number of states of the system and linear in the number of the failure types. In this dissertation we also study diagnosis of discrete event systems (DESs) modeled in the rule-based modeling formalism introduced in [12] to model failure-prone systems. The results have been represented in [43]. An attractive feature of rule-based model is it's compactness (size is polynomial in number of signals). A motivation for the work presented is to develop failure diagnosis techniques that are able to exploit this compactness. In this regard, we develop symbolic techniques for testing diagnosability and computing a diagnoser. Diagnosability test is shown to be an instance of 1st order temporal logic model-checking. An on-line algorithm for diagnosersynthesis is obtained by using predicates and predicate transformers. We demonstrate our approach by applying it to modeling and diagnosis of a part of the assembly-line. When the system is found to be not diagnosable, we use sensor refinement and sensor augmentation to make the system diagnosable. In this dissertation, a controller is also extracted from the maximally permissive supervisor for the purpose of implementing the control by selecting, when possible, only one controllable event from among the ones allowed by the supervisor for the assembly line in automaton models.
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Blossfeld, Pia N. "A note on the Mare model." Universität Leipzig, 2018. https://ul.qucosa.de/id/qucosa%3A20976.
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For the analysis of changes in educational inequality, several quantitative methods have been developed in educational research. One of them is the school transition model (also known as the Mare model). The school transition model has been criticised on many grounds in recent years. In the following, I introduce the advantages of this model, its analytic conception, its critique and explain why this critique is not such a big problem in empirical analyses as is generally assumed. Finally, I give a summary.:1. Introduction
2. Advantages of the Mare model
3. Statistical conception of the Mare model
4. Critique of the Mare model
5. Summary
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Di, Boscio Nicolas. "Mining enterprises and regional economic development : an exploratory analysis of the sustainable development model." Thesis, London School of Economics and Political Science (University of London), 2010. http://etheses.lse.ac.uk/310/.
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Towards the end of the 1990s, and in response to increasing global condemnation, the mining industry adopted sustainable development (SD) principles and standards through corporate social responsibility (CSR) initiatives. This approach not only proposed a dramatic change in the operating practices of large mining houses, but also suggested a grand vision for the industry as a long term catalyser of local economic growth. This research now investigates the effect that mining enterprises which operate under these principles have on sub-national economic development. In doing so, it undertakes multiple case-study analysis, focussing on a single firm, Rio Tinto, and covers three of its subsidiary companies at various stages of development. Consistent with claims by mining advocates, this work confirms the frequently striking importance that large mines have for sub-national economies. However, this investigation disagrees with the emphasis typically attributed to each stream of benefits and brings attention back to the use that mining cash flows are put to. More generally, the study argues that the potential for large mining firms to trigger endogenous growth has been underestimated. On the one hand, these enterprises can contribute distinctly to local capital accumulation; on the other, under certain circumstances, they can also help sustain increases in local productivity endogenously. Indeed; while local preconditions will determine socioeconomic outcomes to a significant degree, mining companies can play a critical part in economic planning and the building of innovative institutions, which could, in turn, help increase the underlying local rate of technological absorption, human capital and overall capacity for economic governance. This entails a drastic (and controversial) change from the role previously assumed by companies. Yet, this study also concludes that, in some other cases, SD has promoted unattainable economic expectations. In these cases, minimising the local impact of mining would be a more advisable economic strategy.
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Nevares, Mario Maia. "Reservas internacionais ótimas de um país: um estudo do caso brasileiro." reponame:Repositório Institucional do FGV, 2007. http://hdl.handle.net/10438/330.
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Previous issue date: 2007-05-04The objective of this paper is to analyze the foreign reserves accumulation among countries such Brazil that builds up international reserves to be protected from externai crises as well as to diminish such probability. We desire to analyze also the determination of optimal levei of reserves. We will approach brief historical of the literature of reserves holdings. In the study of Brazil, we will discuss the optimal levei of Brazilian international reserves using buffer stock model, with temporaries series approach, differing from previous cross-section studies.
O objetivo deste trabalho analisar acumulação de reservas internacionais por parte de países como Brasil, que acumulam reservas na tentativa de se proteger de crises externas bem como diminuir tal probabilidade. Desejamos analisar determinação do nível ótimo de reservas. Apresentaremos um breve histórico da literatura sobre acumulação de reservas. No estudo do Brasil, discutiremos nível ótimo de reservas internacionais brasileiras usando modelo de buffer stock, partir de uma abordagem de séries temporais, diferindo de trabalhos anteriores usando dados cross-section.
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Bible, Stewart Andrew. "STUDY OF THE "POOR MAN'S NAVIER-STOKES" EQUATION TURBULENCE MODEL." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/310.
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The work presented here is part of an ongoing effort to develop a highly accurate and numerically efficient turbulence simulation technique. The paper consists of four main parts, viz., the general discussion of the procedure known as Additive Turbulent Decomposition, the derivation of the "synthetic velocity" subgrid-scale model of the high wavenumber turbulent fluctuations necessary for its implementation, the numerical investigation of this model and a priori tests of said models physical validity. Through these investigations we have demonstrated that this procedure, coupled with the use of the "Poor Mans Navier-Stokes" equation subgrid-scale model, has the potential to be a faster, more accurate replacement of currently popular turbulence simulation techniques since: 1. The procedure is consistent with the direct solution of the Navier-Stokes equations if the subgrid-scale model is valid, i.e, the equations to be solved are never filtered, only solutions. 2. Model parameter values are "set" by their relationships to N.S. physics found from their derivation from the N.S. equation and can be calculated "on the fly" with the use of a local high-pass filtering of grid-scale results. 3. Preliminary studies of the PMNS equation model herein have shown it to be a computationally inexpensive and a priori valid model in its ability to reproduce high wavenumber fluctuations seen in an experimental turbulent flow.
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Vasu, Aishwarya. "MODEL-BASED CONTROL OF DIFFERENTIALLY DRIVEN TWO-WHEELED MOBILE ROBOT." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/360.
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The objective is to model a two wheeled nonholonomic mobile robot for the parking problem and stabilize it using piecewise continuous static feedback control. The nonholonomic robots cannot be stabilized using continuous static feedback controls. In this thesis, the kinematic model of the robot is transformed into a feasible coordinate system. A stabilizing kinematic controller is designed for the stabilization problem in the new coordinate system. The robot has two inputs, viz., v, linear velocity and ω, angular velocity. Two DC motors are used for the left and the right wheels to implement the computed linear and angular velocities. This is included to realize the robot driven by electric motors. The two DC motors are controlled using PID controllers. The practical implementation for a two wheeled robot is also discussed. Pololu 3PI robot is used for the implementation. Line tracking and Line tracking algorithm with PID is also discussed. Possible enhancements include the implementation of the algorithm in dsPIC family of microcontrollers. CMX scheduler for dsPIC family of products can also be ported on dsPIC and the same environment can be simulated in real time. This can be extended to multiple agents who are controlled by a single master, thus forming a single master multi slave network.
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Gaunersdorfer, Andrea, and Cars H. Hommes. "A nonlinear structural model for volatility clustering." SFB Adaptive Information Systems and Modelling in Economics and Management Science, WU Vienna University of Economics and Business, 2000. http://epub.wu.ac.at/380/1/document.pdf.
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A simple nonlinear structural model of endogenous belief heterogeneity is proposed. News about fundamentals is an IID random process, but nevertheless volatility clustering occurs as an endogenous phenomenon caused by the interaction between different types of traders, fundamentalists and technical analysts. The belief types are driven by an adaptive, evolutionary dynamics according to the success of the prediction strategies in the recent past conditioned upon price deviations from the rational expectations fundamental price. Asset prices switch irregularly between two different regimes -- close to the fundamental price fluctuations with low volatility, and periods of persistent deviations from fundamentals triggered by technical trading - thus, creating time varying volatility similar to that observed in real financial data. (author's abstract)Series: Working Papers SFB "Adaptive Information Systems and Modelling in Economics and Management Science"
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Soderquist, Hans L. "Automatic Geometric Data Migration Throughout Views of a Model Fidelity Family." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/360.
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Changes in geometric model parameters are constant throughout the design process. Each group in an organization needs different model information at varying times during the design process. As a result many different models of the same part or assembly arise for the needs and use of each group in each design phase (from conceptual design to full product definition). When one group makes changes to a model, those changes need to be reflected in all of the models which describe the product in all groups and design phases in order for those changes to be verified against all design criteria that were set, and for those changes to be seen by downstream users in the design process. This thesis describes a method for linking these models together which will provide revision control, assuming all models can be updated from any of the other models which define the product and allow for these models to be parameterized using different schemes.
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Augenstein, Christoph. "Rahmenwerk zur integrativen Gestaltung von Services." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-205188.
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Die vorliegende Arbeit befasst sich mit der modellgetriebenen Servicebeschreibung, einem Ansatz zur integrativen Beschreibung bzw. Modellierung von Services. Ausgehend von der Prämisse, dass die Natur von Services nur schwer zu erfassen ist und eine Disziplinen-übergreifende Positiv-Definition nicht erreicht werden kann, soll mit dem Ansatz eine Syn-these bisher vorhandener Modellierungsansätze erfolgen. Das Ziel liegt dabei nicht in einem erneuten Versuch, ein vollständiges Modell zur Beschreibung von Services zu entwickeln, sondern vielmehr vorhandene Perspektiven so zu integrieren, dass ein vollständiges Bild als eine Art Mosaik entsteht. Den Kern der Arbeit bildet das Service Modeling Framework. Als Rahmenwerk umfasst es Anforderungen und Restriktionen für die Arbeit mit unter-schiedlichen Servicemodellen, definiert Methoden zur Integration und bietet Werkzeuge, mit deren Hilfe die darin enthaltenen Konzepte umgesetzt werden.
Ziel der Konstruktion des Rahmenwerks ist es Nutzer in die Lage zu versetzen mittels mo-dellgetriebener Verfahren eine Zusammenführung von Modellen zu ermöglichen. Auf Basis einer fachlichen, nicht nur syntaktischen Beschreibung von Beziehungen zwischen Model-len und Modellelementen sollen Zusammenhänge modelliert werden, die einen Informati-onsaustausch zwischen Modellen realisieren. Dadurch werden Abhängigkeiten zwischen Modellen explizit formuliert oder aber die Entwicklung neuer Modelle auf Basis bereits bestehender Modelle vorangetrieben.
Der Beitrag dieser Arbeit besteht in der Erarbeitung der notwendigen Konzepte und in der Bereitstellung geeigneter Verfahren sowie Werkzeugen zur Umsetzung. Insbesondere stellt diese Arbeit einen Metamodell-basierten Ansatz zur Verfügung, mit dem Modelle über ein Domänen-neutrales Basismetamodell zueinander in Beziehung gesetzt werden können. Zugehörige Werkzeuge, wie Editoren, zeigen eine prototypische Umsetzbarkeit.
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Lazim, Mohamad Alias. "Econometric forecasting models and model evaluation : a case study of air passenger traffic flow." Thesis, Lancaster University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296880.
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Sibanda, Khulumani. "Dynamic adaptive cost model for wireless Internet connectivity in African rural communities." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/380.
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In today’s dynamic technological landscape, wireless communication networks have become an important part of economic development. The emergence of wireless technologies raises hopes to extend communication to remote areas that have not seen any tangible deployment to date. As developing nations pin their hopes to wireless technologies, cost models for wireless communication networks are becoming vital to support the emerging technologies. However, varying cost changes raise critical challenges to the estimation of both capital expenditure and operational expenditure. The network deployment process has numerous events that may cause adjustments to initially estimated project costs. These adjustments are necessary for a cost management plan and this plan includes monitoring cost performance and ensuring that only appropriate changes are made to the network project. The incidents that may cause cost changes can not be entirely predicted as their distribution tend to change dynamically from time to time. Estimating network deployment costs in such a dynamic environment necessitates cost models that can adapt to random occurrence of cost changes. Widely used cost models are usually performed by experienced personnel whose engineering experience is derived from deploying similar networks. In this approach experienced personnel add a certain percentage to the cost estimate to cater for contingency costs. Certainly such an approach depends on individual opinion, making it subjective and void of mathematical estimating relationships which are of paramount importance in ensuring that estimated deployment costs are sufficient to deal with cost uncertainties. We observe that existing approaches can only explore a limited solution space and hence can lead to cost overruns if implemented in dynamically cost changing environments. This thesis presents a wireless communication network deployment cost model that incorporates uncertainties into the final cost estimate. The model is adaptive to unpredictable cost changes since it allows adjustments of confidence levels when calculating contingency costs. This allows dynamically updating the cost changes without the cost model being reconstructed from scratch. We make use of the Poisson process in modeling the occurrence of incidents that are responsible for causing cost changes during network deployment. We also show that the occurrence of the incidents causing cost change are random and tend to follow the Poisson distribution. Using different levels of confidence we model various cost contingencies and make sensitivity analyses to identify the probability of cost overrun when given different contingencies. The dynamic adaptive cost model can be used either at the strategic level to understand the cost of a particular technique or at the operational level, as a way to show how Poisson process in network deployment can compare with engineering experience and other estimating techniques. We believe that the model is useful for remote areas where deployment costs are volatile and the distribution of incidents causing cost change to original cost estimates are diverse and dynamically changing. Further we expect that our research improves the knowledge base of information about the costs for rural communities to connect to the Internet, consequently providing useful input to future policy debates. This work is further poised to be a utility function to help those planning internet infrastructure deployments in least developed regions.
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Keller, Sylvia D. "Validation of Peer-Teaching-Peer Paraprofessional Model in Teen Parenting Nutrition Education." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/390.
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Each year, teen pregnancy occurs in 750,000 15-to-19 year-old women in the United States (U.S.). Utah has the youngest population and the lowest teen abortion rates in the U.S. Approximately 73% of teen pregnancies in Utah result in live births. The prevalence of teen pregnancy and the nutritional risk to mother and child result in a much greater need for social support, such as nutrition education. Current literature shows that the paraprofessional model is effective in increasing positive behavior change through nutrition education. Presently, there is a lack of evidence that paraprofessional teens are capable of accurately and effectively teaching their peers nutrition information.
This pilot study aims to measure the effectiveness of the peer-teaching-peer paraprofessional model in teen parenting nutrition education, and to demonstrate that peer educators ages 18-22 are capable of teaching their peers accurate nutrition information as effectively as adult paraprofessionals.
In this pilot study, two females were trained to become paraprofessional peer educators. To supplement the training of peer educators, this pilot study developed and recorded a nutrition presentation for all six lessons of the paper version Missouri Extension Teen Parenting curriculum. Each trained peer educator taught 10 to 13 clients (ages 14 to 19) over three weeks. For evaluation, the study used pre/post comparisons. Assessment tools include teaching evaluations, pre-post test on nutrition knowledge, 24-hour dietary and physical activity recalls, and behavioral checklist.
There was a significant difference in pre-post tests in knowledge, behavior, and exit survey among participants, indicating that peer educators are able to teach their peers effectively. Although not significant, peer educators' teaching accuracy score was high and improved consistently. Eighty-three of participants like or very much liked to be taught by their peers. Findings from this study showed great potential in having adolescents teach their peers as effectively as older educators.
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Yoshimura, Arihiro. "Essays on Semiparametric Model Selection and Model Averaging." Kyoto University, 2015. http://hdl.handle.net/2433/199059.
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Taub, Lawrence. "Application of a Layered Hidden Markov Model in the Detection of Network Attacks." NSUWorks, 2013. http://nsuworks.nova.edu/gscis_etd/320.
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Network-based attacks against computer systems are a common and increasing problem. Attackers continue to increase the sophistication and complexity of their attacks with the goal of removing sensitive data or disrupting operations. Attack detection technology works very well for the detection of known attacks using a signature-based intrusion detection system. However, attackers can utilize attacks that are undetectable to those signature-based systems whether they are truly new attacks or modified versions of known attacks. Anomaly-based intrusion detection systems approach the problem of attack detection by detecting when traffic differs from a learned baseline. In the case of this research, the focus was on a relatively new area known as payload anomaly detection. In payload anomaly detection, the system focuses exclusively on the payload of packets and learns the normal contents of those payloads. When a payload's contents differ from the norm, an anomaly is detected and may be a potential attack. A risk with anomaly-based detection mechanisms is they suffer from high false positive rates which reduce their effectiveness. This research built upon previous research in payload anomaly detection by combining multiple techniques of detection in a layered approach. The layers of the system included a high-level navigation layer, a request payload analysis layer, and a request-response analysis layer. The system was tested using the test data provided by some earlier payload anomaly detection systems as well as new data sets. The results of the experiments showed that by combining these layers of detection into a single system, there were higher detection rates and lower false positive rates.
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Hagan, Stephen Paul. "THE PROGRESSIVE BLOGOSPHERE AS E-MOVEMENT: IDENTITY, MOBILIZATION, AND THE USER-BASED MODEL." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/dissertations/300.
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Using content analysis and in-depth interviews, this research undertakes a case study of the online progressive blogosphere as a social movement. Previous research into social movement applications of the Internet and computer-mediated communication (CMC) focuses on "street" movement application of Internet resources. These studies find that though Internet applications are a boon to movements, they offer nothing novel, instead allowing movements to perform normal tasks at a faster rate. More recently, scholars have begun to examine movements with stronger roots in the online world, or "e-movements." Earl and Schussman (2003, 2004) assert that not only do unique e-movements exist, but that they have important substantial differences from street movements. This research examines the progressive blogosphere (PB) as one of these e-movements. I examine the movement activity of the PB through the lens of framing and New Social Movements (NSM) in order to gain insight to where e-movements fit within our current knowledge structures. In the end, I find that though decentralized and informal, the PB movement utilizes existing framing tasks and processes in order to mobilize passive readers into active users. After analyzing the PB movements' identity construction, mobilization techniques, goals, and leadership structures, I propose the existence of a "user-based model" for e-movements.
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Kurtz, Zachary Todd. "Local Log-Linear Models for Capture-Recapture." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/360.
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Capture-recapture (CRC) models use two or more samples, or lists, to estimate the size of a population. In the canonical example, a researcher captures, marks, and releases several samples of fish in a lake. When the fish that are captured more than once are few compared to the total number that are captured, one suspects that the lake contains many more uncaptured fish. This basic intuition motivates CRC models in fields as diverse as epidemiology, entomology, and computer science. We use simulations to study the performance of conventional log-linear models for CRC. Specifically we evaluate model selection criteria, model averaging, an asymptotic variance formula, and several small-sample data adjustments. Next, we argue that interpretable models are essential for credible inference, since sets of models that fit the data equally well can imply vastly different estimates of the population size. A secondary analysis of data on survivors of the World Trade Center attacks illustrates this issue. Our main chapter develops local log-linear models. Heterogeneous populations tend to bias conventional log-linear models. Post-stratification can reduce the effects of heterogeneity by using covariates, such as the age or size of each observed unit, to partition the data into relatively homogeneous post-strata. One can fit a model to each post-stratum and aggregate the resulting estimates across post-strata. We extend post-stratification to its logical extreme by selecting a local log-linear model for each observed point in the covariate space, while smoothing to achieve stability. Local log-linear models serve a dual purpose. Besides estimating the population size, they estimate the rate of missingness as a function of covariates. Simulations demonstrate the superiority of local log-linear models for estimating local rates of missingness for special cases in which the generating model varies over the covariate space. We apply the method to estimate bird species richness in continental North America and to estimate the prevalence of multiple sclerosis in a region of France.
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Mastaglia, Barbara. "Decision regret, decision role discrepancy and adjustment to breast cancer : development of a model." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2007. https://ro.ecu.edu.au/theses/320.
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Following a diagnosis of early stage breast cancer women need to make decisions for surgical and adjuvant treatment in a short period of time. They also face a period of adjustment. Little information is available as to how women describe their decision making for breast cancer surgery after some time has elapsed following completion of adjuvant treatment. Moreover, it is not known if women experience decision regret and how decision-making outcomes might later affect their psychosocial adjustment. Therefore, the purpose of the study was to determine the nature and extent of decision regret experienced by women during the first two years following surgery for early stage breast cancer and to describe how this could affect their psychosocial adjustment. A descriptive correlational study was conducted in three phases. The supporting Iiterature guided the conceptual framework for the study .
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Otevřel, Marek. "Rám kočky 330 t mostového licího jeřábu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232036.
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The topic of this diploma thesis is the frame of the foundry trolley crane 330/65/20t. The crane crab is used for handling with molten metal. The frame is analyzed by strength inspection and fatigue strength inspection. The process is according to ČSN EN 13001. The analyses are made by using finite element method on a beam and shell models. The diploma thesis was made in cooperation with the Královopolská a.s. company.
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Rohde, Johannes Bernhard Rudolf [Verfasser]. "Essays on model risk : the role of volatility for the accuracy of financial risk models / Johannes Bernhard Rudolf Rohde." Hannover : Technische Informationsbibliothek (TIB), 2015. http://d-nb.info/1081965088/34.
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Rohde, Johannes [Verfasser]. "Essays on model risk : the role of volatility for the accuracy of financial risk models / Johannes Bernhard Rudolf Rohde." Hannover : Technische Informationsbibliothek (TIB), 2015. http://d-nb.info/1081965088/34.
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Young, Julie. "Biomarkers of oxidative stress in models of schizophrenia." Thesis, Robert Gordon University, 2007. http://hdl.handle.net/10059/330.
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Background: Increasing evidence indicates that oxidative injury exists in schizophrenia. Although it may not be the main cause, oxidative damage has been suggested to contribute to the pathophysiology and may account for deteriorating course and poor outcome in schizophrenia. There is increasing interest in the neuroprotective efficacy of antioxidants in modulating such processes with at least one polyphenolic being tested as a prophylactic in Alzheimer's disease. Beneficial effects of adjunctive ω-3 (n-3 series) polyunsaturated fatty acids with combined intakes of vitamin C and E on both the positive and negative symptoms of schizophrenia have been reported. Robust in vitro systems are desirable, enabling a mechanistic investigation of the molecular mechanisms underpinning such effects and identification of further potentially efficacious nutraceuticals. Materials and Method: Comparative studies employing a lymphoblastoid cell line of schizophrenic origin, a neuroblastoma IMR-32 cell line and the lymphoma U937 cell line was undertaken. The cytoprotective effects of phenolic antioxidants and essential fatty acids in affording protection to cellular DNA, protein and lipids from an oxidative challenge were assessed in the three cell lines. In addition, two human studies were undertaken. The first study utilised the non-invasive technique of breath hydrocarbon analysis and the lipid peroxidation products in a population of schizophrenic patients were compared to a population of apparently healthy aged-matched control subjects, while the second study investigated possible differences in biomarkers of DNA, lipid and protein oxidation in schizophrenic and control subjects. Plasma vitamin C levels were also compared in both groups. Results and Conclusion: Cell Culture Studies: Pre-treatment of peripheral and neuronal cells with antioxidant or ω-3 fatty acids followed by an oxidative challenge significantly reduced the levels of DNA damage. Treatment with H₂O₂ alone and following pre-treatment with EPA or DHA had no effect on the levels of protein carbonyls in U937 cells, however, DHA supplementation did appear to reduce endogenous and H2O2-induced protein carbonylation. Marked differences in the uptake of fatty acids by the cell types were found and the IMR-32 cell line was most susceptible to the oxidant challenge. Hydroxytyrosol gave significant cytoprotection in all three cell lines and this possible neuroprotective efficacy warrants further investigation, both in vitro and in vivo. Treatment of the three cell lines with a high concentration of H2O2 for 30min or 4 hours did not induce a significant increase in MDA. U937 cells were supplemented for 24 hours with fatty acids followed by a 4 hour oxidative stress. Both EPA and DHA treatment appeared to reduce LOOH levels in the U937 cells but not significantly. Cytoplasmic PLA2 activity in the three human cell lines was examined and the basal level of cPLA2 activity was found to be comparable in the lymphoblastoid and IMR-32 cells but significantly lower than that measured in the U937 cells. Supplementation of the U937 cell line with EPA caused a significant decrease (p<0.05) in cPLA2 activity relative to the vehicle treated control but neither EPA nor DHA supplementation appeared to have any significant effect on either total PLA2 or cPLA2 activity in IMR-32 or lymphoblastoid cell lines. Abstract v Human Studies: No significant difference was found between the levels of ethane and pentane in the breath from the schizophrenic patients and control samples. In addition, no significant difference in the levels of plasma MDA between the two groups was detected. Ethane levels and MDA levels were higher in the male schizophrenic samples than in the female schizophrenic samples but the results were not statistically significant. The pentane levels were higher in the female schizophrenic samples when compared to the male schizophrenia samples but again, these were not significantly greater. Finally, results of study 2 revealed that cellular DNA damage and plasma protein carbonyl levels were increased in the schizophrenic group compared to control subjects but not significantly. However, DNA damage in lymphocytes from the male schizophrenic group was significantly higher than the female group. Biomarkers of lipid peroxidation and plasma vitamin C levels also revealed no significant difference between the two groups under investigation, although a significant elevation in plasma vitamin C was observed in the female control group when compared to the male groups. Treatment of cells with EPA, DHA and hydroxytyrosol to reduce levels of oxidative damage warrants further investigation. Ultimately, it is important to investigate a range of biomarkers to determine whether the measurement of oxidative damage to lipids, proteins and DNA has clinical significance. This will enable better understanding of the disease of interest and allow these biomarkers to become potentially useful clinical tools.
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Furmanski, Orion. "Manipulating Embryonic Neural Precursor Cells for Therapeutic Transplantation into a Rat Model of Neuropathic Pain." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/340.
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Persons with spinal cord injury (SCI) suffer life-long consequences including paralysis, loss of involuntary bodily functions, and chronic pain. A subset of SCI patients develop neuropathic pain (NP), a chronic condition resulting from damage to the spinal cord. Hyperexcitability of spinal cord sensory neurons near damaged tissue is believed to underlie SCI-related NP. Although many therapies have been employed clinically to combat SCI-NP, few give satisfactory long-term relief. Transplantation of cells that release GABA, a molecule that inhibits neuronal activity, is being explored as an alternative to current SCI-NP therapies. My experiments made progress toward preclinical modeling of GABA cell therapy for SCI-NP. First, I sought to determine whether quisqualic acid (QUIS)-induced SCI altered responses to tonic pain stimuli or altered GABAergic neural circuitry in rats. Second, I sought to determine whether a combination of genetic and trophic manipulations could promote a GABAergic phenotype in rat embryonic neural precursor cells (NPCs) in an in vitro culture system. The results revealed that QUIS-SCI rats exhibit unusually prolonged nocifensive responses to hind paw formalin injections. There was no significant difference between QUIS-SCI and sham surgery rats in c-Fos immunolabeling of spinal cord sensory neurons after formalin-induced neuronal activity. However, immunohistochemistry revealed substantial decreases in staining for markers of GABA presynaptic vesicles in injured spinal cord tissue. NPCs were enriched for a neuronal phenotype by combining withdrawal of the growth factor FGF-2 from culture media and overexpression of the transcription factor MASH1 in transfected cells. Although glial marker expression was suppressed in NPCs by these manipulations, expression of neuronal markers none the less declined through time. MASH1-overexpressing NPCs exhibited greater clonal expansion and decreased stress-induced PDI expression after FGF-2 withdrawal as compared to naïve. In light of existing data, these results suggest that the QUIS-SCI model may be useful for testing the efficacy of GABAergic NPC transplantation to reduce neuropathic pain. MASH1 overexpression and FGF-2 withdrawal could serve as a first step toward enriching GABA in NPCs for transplantation. Although the mechanism for MASH1 cytoprotection remains unclear, MASH1 may enhance survival of NPCs grafted into the spinal cord. These experiments contributed to the preclinical basis for application of therapeutic GABAergic stem cell transplantation for NP in human SCI patients.
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McQuilling, Mark. "EXPERIMENTAL STUDY OF ACTIVE SEPARATION FLOW CONTROL IN A LOW PRESSURE TURBINE BLADE CASCADE MODEL." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/320.
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The flow field around a low pressure turbine (LPT) blade cascade model with and without flow control is examined using ejector nozzle (EN) and vortex generator jet (VGJ) geometries for separation control. The cascade model consists of 6 Pak-B Pratt andamp; Whitney low pressure turbine blades with Re = 30,000-50,000 at a free-stream turbulence intensity of 0.6%. The EN geometry consists of combined suction and blowing slots near the point of separation. The VGJs consist of a row of holes placed at an angle to the free-stream, and are tested at two locations of 69% and 10.5% of the suction surface length (SSL). Results are compared between flow control on and flow control off states, as well as between the EN, VGJs, and a baseline cascade with no flow control geometry for steady and pulsatile blowing. The EN geometry is shown to control separation with both steady and pulsatile blowing. The VGJs at 69% SSL are shown to be much more aggressive than the EN geometry, achieving the same level of separation control with lower energy input. Pulsed VGJs (PVGJ) have been shown to be just as effective as steady VGJs, and results show that a 10% duty cycle is almost as effective as a 50% duty cycle. The VGJs at 10.5% SSL are shown to be inefficient at controlling separation. No combination of duty cycle and pulsing frequency tested can eliminate the separation region, with only higher steady blowing rates achieving separation control. Thus, the VGJs at 69% SSL are shown to be the most effective in controlling separation.
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Arnold, Robert [Verfasser]. "Ein normativ begründetes Modell für die Krankenversicherung in Deutschland / Robert Arnold." Aachen : Shaker, 2006. http://d-nb.info/117053046X/34.
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Urs, Raksha. "Investigation of Accommodation and Presbyopia using Ultrasound Imaging during Ex Vivo Simulated Accommodation." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/360.
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The goal of this project is to obtain quantitative images of the lens and the ciliary body to validate EVAS-II (Second generation Ex Vivo Accommodation Simulator). To accomplish this goal it was necessary to develop methods, instrumentation and image processing techniques to acquire 3D images in EVAS-II, using UBM (Ultrasound Bio Microscope), and to apply these techniques to non-human primate eyes. The lens studies included measurement of speed of sound in the lens to reconstruct accurate images of the lens, development of instrumentation to measure the un-distorted lens shape and development of a mathematical model to quantify the whole lens shape. Speed measurements showed that the speed of sound exhibits a gradient profile in the equatorial plane, similar to refractive index and protein distributions in the lens. Lens shape measurements showed that the UBM can be used to accurately measure thickness, diameter, cross-sectional area, volume and surface area of the lens. The ciliary body studies included development of instrumentation and algorithms to obtain 3-D images of tissue in EVAS-II and development of methodology to quantify ciliary body movement during stretching. Studies showed that the accommodation process in young baboon eyes in EVAS-II is comparable to the in vivo process in rhesus monkeys. The UBM can be used to obtain reliable quantitative information about the lens and the ciliary body. 3-D UBM enables monitoring of ciliary body motion of the entire accommodative apparatus.
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di, Iorio Angelo <1977>. "Pattern-based segmentation of digital documents: model and implementation." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/370/1/PhD_thesis_-_AngeloDiIorio.pdf.
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This thesis proposes a new document model, according to which any document can be segmented in some independent components and transformed in a pattern-based projection, that only uses a very small set of objects and composition rules. The point is that such a normalized document expresses the same fundamental information of the original one, in a simple, clear and unambiguous way. The central part of my work consists of discussing that model, investigating how a digital document can be segmented, and how a segmented version can be used to implement advanced tools of conversion. I present seven patterns which are versatile enough to capture the most relevant documents’ structures, and whose minimality and rigour make that implementation possible. The abstract model is then instantiated into an actual markup language, called IML. IML is a general and extensible language, which basically adopts an XHTML syntax, able to capture a posteriori the only content of a digital document. It is compared with other languages and proposals, in order to clarify its role and
objectives. Finally, I present some systems built upon these ideas. These applications are evaluated in terms of users’ advantages, workflow improvements and impact over the overall quality of the output. In particular, they cover heterogeneous content management processes: from web editing to collaboration (IsaWiki and WikiFactory), from e-learning (IsaLearning) to professional printing (IsaPress).
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Putyatina, Oleksandra [Verfasser], and Jörn [Akademischer Betreuer] Sass. "Filtering, Approximation and Portfolio Optimization for Shot-Noise Models and the Heston Model / Oleksandra Putyatina. Betreuer: Jörn Sass." Kaiserslautern : Technische Universität Kaiserslautern, 2012. http://d-nb.info/102762698X/34.
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O, Nga Kwan Angie. "A study of contributing factors to the success of electronic commerce : a trust model for web shopping." HKBU Institutional Repository, 2001. http://repository.hkbu.edu.hk/etd_ra/310.
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Hockenmaier, Julia. "Data and models for statistical parsing with combinatory categorial grammar." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/320.
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This dissertation is concerned with the creation of training data and the development of probability models for statistical parsing of English with Combinatory Categorial Grammar (CCG). Parsing, or syntactic analysis, is a prerequisite for semantic interpretation, and forms therefore an integral part of any system which requires natural language understanding. Since almost all naturally occurring sentences are ambiguous, it is not sufficient (and often impossible) to generate all possible syntactic analyses. Instead, the parser needs to rank competing analyses and select only the most likely ones. A statistical parser uses a probability model to perform this task. I propose a number of ways in which such probability models can be defined for CCG. The kinds of models developed in this dissertation, generative models over normal-form derivation trees, are particularly simple, and have the further property of restricting the set of syntactic analyses to those corresponding to a canonical derivation structure. This is important to guarantee that parsing can be done efficiently. In order to achieve high parsing accuracy, a large corpus of annotated data is required to estimate the parameters of the probability models. Most existing wide-coverage statistical parsers use models of phrase-structure trees estimated from the Penn Treebank, a 1-million-word corpus of manually annotated sentences from theWall Street Journal. This dissertation presents an algorithm which translates the phrase-structure analyses of the Penn Treebank to CCG derivations. The resulting corpus, CCGbank, is used to train and test the models proposed in this dissertation. Experimental results indicate that parsing accuracy (when evaluated according to a comparable metric, the recovery of unlabelled word-word dependency relations), is as high as that of standard Penn Treebank parsers which use similar modelling techniques. Most existing wide-coverage statistical parsers use simple phrase-structure grammars whose syntactic analyses fail to capture long-range dependencies, and therefore do not correspond to directly interpretable semantic representations. By contrast, CCG is a grammar formalism in which semantic representations that include long-range dependencies can be built directly during the derivation of syntactic structure. These dependencies define the predicate-argument structure of a sentence, and are used for two purposes in this dissertation: First, the performance of the parser can be evaluated according to how well it recovers these dependencies. In contrast to purely syntactic evaluations, this yields a direct measure of how accurate the semantic interpretations returned by the parser are. Second, I propose a generative model that captures the local and non-local dependencies in the predicate-argument structure, and investigate the impact of modelling non-local in addition to local dependencies.
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Teixeira, Paula Cristina Antunes. "O acompanhamento local como modelo de desenvolvimento curricular em matemática." Master's thesis, Universidade Nova de Lisboa: Faculdade de Ciências e Tecnologia, 2004. http://hdl.handle.net/10362/330.
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Dissertação de mestrado em Ciências da Educação: área de Educação e DesenvolvimentoEm 1997/98 foi implementado a nível nacional um programa de Matemática no Ensino Secundário, para acompanhar essa implementação o Departamento do Ensino Secundário definiu um Projecto de Acompanhamento Local (PAL) que decorreu entre 1997 e 2002. Esta tese tem como objecto de estudo o PAL. O problema central é a sua caracterização como modelo de desenvolvimento curricular em Matemática e tem como objectivos: > Apresentar e discutir as condições que se foram reunindo até a definição e implementação do PAL. > Compreender o PAL na perspectiva dos professores Acompanhados e Acompanhantes. > Contribuir para a reflexão da elaboração e implementação de modelos de desenvolvimento curricular no ensino da Matemática. Optou-se por uma metodologia qualitativa/interpretativa. A apresentação e análise dos dados recolhidos foram organizados em dois estudos de caso, um histórico e outro antropológico. O estudo mostra que os Acompanhantes Locais em níveis diferentes do desenvolvimento curricular procuraram assegurar uma passagem do currículo prescrito ao currículo modelado e ao currículo em acção mais completa. Os professores Acompanhados aceitam que a figura de Acompanhante Local como par, isto é, leccionando também, se torna necessária para dinamizar e envolver os professores da mesma escola e de escolas vizinhas para preparar programas novos.
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Pol, Marjon van der. "Intertemporal preferences for health : a comparison of the discounted utility model and hyperbolic models and of intertemporal preferences across health outcome." Thesis, University of Aberdeen, 2000. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602020.
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It is standard practice to assume the discounted utility (DU) model on the part of the economic agents. This thesis tests the key axiom of the DU model (stationarity) in the health domain. Intertemporal preferences for health are of interest because of the debate over the appropriate treatment of future health effects in economic evaluation and of the relationship between intertemporal preferences and health-affecting behaviour. Social intertemporal preferences for fatal changes in health and private and social intertemporal preferences for non-fatal changes were elicited from members of the general public. Private intertemporal preferences for non-fatal changes were elicited from university students. Stationarity was violated in all three studies indicating that the DU model does not accurately describe individuals' intertemporal preferences. Psychologists dissatisfied with the DU model have developed hyperbolic models which replace the stationarity axiom by a generalised stationarity axiom. This thesis compared the descriptive properties of the DU model and hyperbolic discounting models in the health domain. The results showed that the hyperbolic discounting models fitted the data better than the DU model. This indicates that hyperbolic models should be preferred in the analyses of health affecting behaviour. Whether they should also be used in economic evaluations is likely to depend on other criteria as well as descriptive superiority. To inform the debate about the appropriate discount rate for health effects in economic evaluations this thesis investigated whether intertemporal preferences differ across outcomes within the health domain. The results showed that private and social intertemporal preferences for non-fatal changes in health are very similar. More differences were found between intertemporal preferences for fatal changes and non-fatal changes. This indicates that the debate over the relationship between individuals' preferences and the social discount rate is less important and that the debate should perhaps focus more on whether the rate should depend on the type of health outcome of the intervention.
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Sláma, Ondřej. "Jeřábová kočka 360 t." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377477.
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The topic of this diploma thesis is the frame of the foundry crane with load capacity 360 t. The frame is analysed by strength inspection and fatigue strength inspection according to norm ČSN EN 13001. The analysis are made by using finite element method on shell model. The diploma thesis was made in cooperation with Královopolská a.s. company.
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Scheithauer, Gregor [Verfasser] [Akademischer Betreuer]. "A Service Description Method for Service Ecosystems - Meta Models, Modeling Notations, and Model Transformations / Gregor Scheithauer. Betreuer: Gregor Scheithauer." Bamberg : Universitätsbibliothek der Universität Bamberg, 2011. http://d-nb.info/1014896738/34.
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Hood, Kristina. "To Use or Not to Use: The Role of Affect and Cognition in Changing Attitudes toward Using Condoms among African American Women." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/380.
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The current project involved three studies designed to examine which characteristics of persuasive communications change condom use attitudes. Study 1 investigated the effect of message type (affective versus cognitive) and source (male versus female) on attitude change among a sample of African American women attending college. In Study 1 (N = 146), the affective message and female source produced the most positive change in condom use attitudes. Study 2 examined whether message type and source were associated with favorable condom attitudes in a community sample and whether these findings differed from a college sample. Twenty-seven women participated in group discussions and completed measures of attitudes and intentions. Similar to Study 1, the pattern of means in Study 2 showed the affective message delivered by the female source resulted in the most positive condom use attitude change. These results were not significant likely due to the small sample. Focus groups were also conducted to better understand the types of condom use messages African American women find effective. Several themes emerged: condom used primarily for pregnancy prevention; negative condom use attitudes; communicating messages through internet, TV, and radio; creating fun, catchy, and informative messages; using celebrities and peers to deliver messages; and increasing the frequency of messages to equal importance of topic. The third study assessed the effectiveness of an attitude change pilot intervention that was based on the results of Studies 1 and 2. The study used a 2 (intervention vs. control) X 3 (pretest, posttest, follow-up) mixed factorial design to examine whether women’s attitudes changed after a pilot session and whether the change persisted over time. African American women (N = 115) were recruited through Craigslist and community agencies. There were no significant differences across time for the intervention and the control group. Reasons for the lack of an effect in Study 3 are discussed. Taken together, these studies provide evidence that, under certain conditions an affective message delivered by a female source can change attitudes toward using condoms. The results of these studies could potentially enhance existing interventions by renewing a focus on changing attitudes as well as behavior.
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Loy, Jens-Peter, and Christoph Weiss. "Synchronisation in multi-product firms. Evidence from german grocery prices." Inst. für Volkswirtschaftstheorie und -politik, WU Vienna University of Economics and Business, 2003. http://epub.wu.ac.at/300/1/document.pdf.
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Using a unique panel data set for German grocery prices we find significant price synchronization within food retail chains as well as within individual food stores (between products). Price synchronization between chains appears to be less pronounced. Common shocks can only explain some synchronization, indicating that strategic motives as well as menu costs are of significant importance. (author's abstract)Series: Working Papers Series "Growth and Employment in Europe: Sustainability and Competitiveness"
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Umbach, Simon Lineu [Verfasser], Jörg [Gutachter] Breitung, and Robinson [Gutachter] Kruse-Becher. "Macroeconomic Forecasting and Evaluation with Supervised and Neural Network Reinforced Factor Models / Simon Lineu Umbach ; Gutachter: Jörg Breitung, Robinson Kruse-Becher." Köln : Universitäts- und Stadtbibliothek Köln, 2021. http://d-nb.info/1236341244/34.
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Faulk, Joseph Morgan. "Continuing professional education : a practical ideal type model and the program assessment of a federal Office of Inspector General /." View online version, 2009. http://ecommons.txstate.edu/arp/310.
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Shafikova, Gulnara Marselevna. "Analysis of Diffusion Models in Eclipse 300." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23613.
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Molecular diffusion could be an efficient recovery mechanism in many applications in reservoir engineering. Proper modelling of diffusion in hydrocarbon mixtures at the reservoir conditions is not a simple task and requires reliable diffusion coefficients for accurate diffusion flux calculations.The main objective of this study is to analyse diffusivity models for a wide range of experimental conditions, so that to examine diffusion performance driven by concentration and chemical potential gradients. We simulate the diffusion experiments in the porous media, considering mixing in the binary system composed of C1 and C2 components. The commercial compositional simulator Eclipse 300 with fully implicit solution method is used for simulation study. In the all run cases, the system is assumed to be isothermal. The study was restricted to diffusion in the single gas phase, unless the cross-phase diffusion was under investigation.This work is also directed to determine diffusion coefficients from simulated diffusion experiments. The conventional approach to estimate diffusion coefficients from laboratory experiments is adopted to determine mass transfer coefficients from simulation results. It has been proved that numerical solution is a result of pure diffusion transfer and unequal bulk flows of C1 and C2 particles. The effect of mixture molar density variation with composition on diffusion behavior has been studied. It will be shown that fluctuations of mixture volumetric properties create convective bulk fluxes, which can either intensify or oppose mass transfer by pure diffusion flow.The study of the effect of molar density variation on diffusion performance considering a simple binary mixture, however, provides a basis for a better understanding of more realistic situations in which the mixture consist of more than two components.