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Zhu, Xiaohong. "Numerical methods for a mixed Stokes-Darcy model /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MATH%202007%20ZHU.
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Zschoche, Ruth. "A Multilevel Model of Police Corruption: Anomie, Decoupling, and Moral Disengagement." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3422.
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Police corruption is a primary concern for law enforcement agencies. The purpose of this study was to identify factors that could predict the likelihood of police officer susceptibility to corruption. Data was collected through surveys of 1083 officers within eight U.S. police agencies that were participating in the National Police Research Platform funded by the National Institute of Justice. The data were analyzed using multilevel structural equation and base multilevel models.
The theoretical model for this study addressed susceptibility to corruption on both the departmental (clusters) and individual officer levels. Four main constructs were utilized in this study. Acceptance of deviant norms was the outcome variable operationalizing susceptibility to corruption. Anomie was a departmental predictor operationalizing expectations that socially accepted goals could not be accomplished through socially acceptable means. Decoupling was a departmental predictor measuring the extent to which departmental pragmatic goals were out of alignment with official ethical codes. Moral disengagement was the individual predictor operationalizing the ability to use cognitive mechanisms to excuse unethical decision-making.
Departments higher in anomie and decoupling were hypothesized to have higher acceptance of deviant norms that condone corruption. Officers with higher levels of moral disengagement were also expected to have a greater acceptance of deviant norms. The departmental environment was expected to have more influence than individual officer traits such that anomie and decoupling would moderate the effects of moral disengagement within departments.
The results demonstrated the promise of the multilevel theoretical model. Anomie was a strong predictor of acceptance of deviant norms. Moral disengagement was also a moderately strong predictor of acceptance of deviant norms in the base multilevel models. Anomie moderated the effect of moral disengagement to some degree, although it had no impact on the slope between acceptance of deviant norms and moral disengagement. Differences between departmental subgroups indicated how officer assignments and demographic characteristics may impact susceptibility to corruption.
Study limitations related primarily to the multilevel structural equation model, scale construction, and sampling. Limitations are addressed as regards their general relevance to theory and methodology. Implications of the results for policy and future research are discussed.
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Mustapha, Nazeem. "Aspects of a spherically symmetric model of the post-decoupling universe." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/17524.
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Bibliography: pages 84-88.<br>The central aim of this thesis is to consider aspects of the spherically symmetric Lemaitre-Tolman-Bondi (LTB) solution as a model of the post-decoupling universe. To do this comprehensively is a massive task and is not our aim here. Indeed, far from it, we will concentrate on select instances of this programme and attempt in some places to indicate possibilities for further study. There are many solutions of the EFE which satisfy what we consider to be 'reasonable criteria' for a cosmology and others that do not. The LTB solution may be accepted as a reasonable cosmological model because ■ It allows non-empty solutions. ■ It allows expanding solutions. ■ It has a homogeneous and isotropic limit. ■ It allows for inhomogeneity.
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Can, Kemal Caglar. "Postponement, Mass Customization, Modularization and Customer Order Decoupling Point: Building the Model of Relationships." Thesis, Linköping University, Department of Management and Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11339.
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<p>This paper focuses on four interrelated strategies: postponement, mass customization, modularization and customer order decoupling point. The goal of the postponement is to delay the customization as late as possible in the supply chain. It is also known as delayed differentiation. Mass customization is a relatively new term, which began to gain attention in the industry a decade ago. It was an obligatory invention as a response to the global market which becomes more turbulent day by day for the last two decades. Its goal is to produce customized products at low costs. Modularization is a common term that is used in many areas. In this study, we will focus on product architecture modularity and process modularity. Customer order decoupling point, which is also known as order penetration point, is used to distinguish the point in the supply chain where a particular product is associated to a specific order.</p><p>Our target is building a model that explains how these four concepts are related. In order to achieve this, we will, first, research every concept individually; we will state the definitions, levels, benefits, enablers, success factors, drivers, etc. of the concepts. Then we will study the pair-wise relationships of these strategies. We will build our model according to the findings we have found in the literature. After building our model, we will explore it in Autoliv Electronics to see how it works in practice.</p><p>Briefly, our model states the following:</p><p>Modularization is an enabler of customization and it is necessary for the success of mass customization where set-up costs are critical. Product architecture modularity provides rapid assembly and cost efficiency that is required for postponement and mass customization. In addition, it is used to measure the mass customization degree according to some others.</p><p>Postponement requires process modularity, and it moves the customer order decoupling point downstream in the value added material flow. It contributes the mass customization by increasing both the leanness and agility.</p><p>Customer order decoupling point uses the customer requirements and existing capabilities of the mass customization for optimizing the flexibility-productivity balance.</p>
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White, Thomas W. "The development of model organic decoupling films for use on strongly-interacting metal surfaces." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/62963/.
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Many of the highlights in the surface science field in the last years have arisen from the study of organic molecules adsorbed upon, but physically decoupled from, metallic substrates. When adsorbed on bare surfaces like Cu, the strong interaction between the two can have a number of different effects on the chemistry, functionality and assembly of the adsorbates. These effects can be reduced or even prevented by incorporating an ultra-thin insulating film between the molecule and the metal, enabling the retention of the desired molecular properties. Previous studies have almost exclusively used films of inorganic material, such as alkali halides and metal oxides. In this work, an all-organic alternative approach has been developed, which should allow a greater degree of control over the nature of the decoupling film and its corresponding interactions. To demonstrate the potential impact of the molecule-substrate interaction on the formation of molecular nanostructures, the adsorption and assembly of a prototypical molecular tecton, terephthalic acid (TPA), has been explored on Cu(110) and Cu(111). On Cu(110), the TPA is deprotonated and goes on to form a range of metal-organic or all-organic monolayer films. The exact structure obtained is determined by the total molecular coverage, which is rationalised by consideration of the TPA adsorption energies and the molecular density in each phase. On Cu(111), TPA adsorbs intact, and assembles into a brickwork-like structure characterised by both uncharacteristically short and elongated hydrogen bonds. This unusual assembly is the result of the oft-cited, but in general poorly understood, ‘interplay of intermolecular and molecule-substrate interactions’. In a bid to understand the observed supramolecular assembly of TPA on Cu(111), a simple algorithm has been developed that is capable of predicting both its quantitative and qualitative aspects. Moreover, this analytical model can be readily expanded to more complex assemblies, such as those using more complex molecules and surfaces. In addition, the formation of Cu- and Fe-terephthalate complexes has been explored. Oxalic acid (OA) monolayers have been investigated as prototype organic decoupling layers for the Cu(110) and Cu(111) surfaces. This molecule was chosen as, in previous work, it had been reported to adsorb in an upright orientation and assemble into a densely packed monolayer on Cu(110). In this work, a flat-lying, low density film has been obtained on Cu(110), which later proved to be incapable of supporting molecular ‘overlayers’unless it was cooled to low temperature prior to the deposition of molecular overlayers. In contrast, a densely-packed, upright monolayer was obtained on Cu(111). This decoupling layers was effective even at room temperature, and moreover appears to plays a significant role in determining the assembly of the overlayer species. These studies indicate the potential of vertically standing organic films as both decoupling layers and also as a tool with which to directly modify and control the assembly of organic nanostructures.
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Gralla-Koser, Robert [Verfasser]. "Polymer Model System for Mechanosensitivity Studies: Decoupling Mechanics from Biological and Topographical Cues / Robert Gralla-Koser." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1174252189/34.
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Kunz, David Alexander [Verfasser], and M. [Akademischer Betreuer] Steinhauser. "Decoupling Coefficients and the Lightest CP-Even Higgs Boson Mass in the Minimal Supersymmetric Standard Model / David Alexander Kunz. Betreuer: M. Steinhauser." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1074463676/34.
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Berglund, Klara, and Per Christensson. "Applicering av kundorderpunktsmodeller på utbildningar inom en konsultverksamhet." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-27668.
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Syfte – Examensarbetets syfte är att beskriva utvecklingsprocessen för utbildningar inom en konsultverksamhet utifrån kundorderpunktsmodeller som används inom tillverkande verksamheter. Syftet har brutits ned i två delmål: Delmål: Att beskriva utvecklingsprocessen för utbildningar inom en konsultverksamhet. Delmål: Att placera in utvecklingsprocessen för utbildningar i kundorderpunktsmodellerna. Metod – För att uppfylla examensarbetets syfte genomfördes en fallstudie på teknikkonsultföretaget Combitech AB i Jönköping. För att ge en grund till det teoretiska ramverket gjordes en litteraturstudie. Empiri samlades in genom en fallstudie, innehållande intervjuer och dokumentstudie. Empirin har sedan analyserats mot det teoretiska ramverket och genom mönsterjämförelse placerades kundorderpunkterna in i modellerna. Analysen har bidragit till att uppnå examensarbetets syfte. Resultat – De utvecklingsprocesser som identifierades för de tre utbildningskategorierna saknade ett standardiserat arbetssätt. I stället var utbildningarna ofta enskilt framtagna och hårt knutna till de enskilda konsulterna. Examensarbetet visar att de två kundorderpunktsmodellerna från tillverkande verksamhet fungerade olika bra för att visualisera graden av kundorderstyrning i utvecklingsprocessen för en konsultverksamhet. Som visualiseringsverktyg fungerade den tvådimensionella kundorderpunktsmodellen lite sämre då den inte visade så stor skillnad mellan de beskrivna processerna. Modellen för utvecklings- och designprocessen var mer nyanserad och fungerade bättre för att indikera vilken aktivitet i utvecklingsprocessen som var kundorderdriven. Implikationer – Kundorderpunktsmodellerna är skapade för en tillverkande verksamhet som producerar fysiska varor och genom att testa modellerna på en tjänsteverksamhet utmanas modellens ramverk och funktion. Detta examensarbete har bidragit till att täcka en del av det identifierade teoretiska gapet i användningen av kundorderpunktsmodeller mellan tillverkande verksamhet och tjänsteverksamhet. Vidare forskning – För att bidra till att täcka det teoretiska gapet kan förslagsvis den tvådimensionella kundorderpunktsmodellen vidareutvecklas och anpassas helt för tjänsteverksamhet. En person med akademisk kunskap om tjänsteverksamhet och kundorderpunktsteorier skulle kunna bidra med ny teori inom området. Det skulle också vara intressant att undersöka om det går att kombinera de två kundorderpunktsmodellerna som presenterats i detta examensarbete.<br>Purpose – The purpose of this thesis is to describe the development process for educations within consulting with customer order decoupling point models commonly used within manufacturing operations. The purpose has been broken down into two parts: Objective: To describe the development process for educations within a consultancy. Objective: To position the development process for educations based on the customer order decoupling point models. Method – In order to meet the thesis purpose, a case study was conducted on the engineering consultancy Combitech AB in Jönköping. To provide a basis for the theoretical framework a literature study was performed. To collect empirical data a case study including interviews and a document study was conducted. The empirical data were then analysed against the theoretical framework, and through pattern matching the customer order decoupling points were positioned into the models. The analysis has helped to achieve the thesis purpose. Findings – The engineering process that was identified for the three educational categories lacked a standardized approach. Instead, programs were often individually designed and tightly tied to the individual consultants. The thesis shows that the two customer order decoupling point models from manufacturing operations varied in usefulness to visualize the degree of customer order management in the engineering process of a consultancy business. As a visualization tool the two-dimensional customer order decoupling point model was of limited value because it didn’t show much difference between the processes described. The model for the engineering and design process was more nuanced and worked better to indicate which activities in the engineering process that were customer order driven. Implications – The customer order decoupling point models are created for manufacturing operations that produce physical goods and by testing these models on a service, the model framework and function is challenged. This thesis has helped to cover a part of the identified theoretical gap in the use of customer order decoupling point models between manufacturing operations and service operations. Limitations – To help cover the theoretical gap the two-dimensional customer order decoupling point model can tentatively be further developed and fully customized for service operations. A person with an academic knowledge of service and customer order decoupling point theories could help create new theory in the field. It would also be interesting to investigate whether it is possible to combine the two customer order decoupling point models presented in this thesis.<br>KOPtimera
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Ari, Ragavan Neethiahnanthan. "The organization of universities through the lens of Academic Workload Model : actors and higher education system." Thesis, Toulouse 2, 2016. http://www.theses.fr/2016TOU20138.
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Cette thèse engagée à partir des enjeux de la transformation du paysage international de l’éducation supérieure et ses implications au niveau local et national de l’organisation des universités. Basé dans une approche néo-rationaliste des interactions entre acteurs et les systèmes d’enseignement supérieure, le concept gigogne d’arènes académiques et les processus de couplage/découplage, l’analyse se focalise sur le cas d’étude du développement, implantation et ajustement d’un dispositif de calcul des services d’enseignant-chercheur. La méthodologie est basée sur une observation participante de longue durée, l’action-recherche et la méthode d’étude de cas. L’analyse quantitative relative à la transformation de la structure et de la performance des enseignants-chercheurs avec les accomplissements de l’université est combinée avec l’analyse qualitative de données collectées par des entretiens individuels et de groupes conduits avec des enseignants-chercheurs, des membres de la direction de l’université ainsi qu’avec des experts de l’enseignement supérieur malaisien et international. Les analyses conduites démontrent – au niveau de l’organisation universitaire – la capacité de négociation des académiques et du management par rapport à leurs rôles et conditions d’avancement de carrière est central dans l’instrumentation du dispositif de calcul des services. Au niveau national, les analyses soulignent la complémentarité entre institutions d’éducation supérieure privées et publiques. Au niveau international, les analyses soulignent la capacité d’ajustement du système universitaire et des politiques malaisiennes relatives à l’enseignement supérieur et à la recherche pour la régulation de leurs positions dans l’arène académique internationale<br>This thesis is based on issues concerning the changing landscape of higher education globally and its implication at the local and national levels of the organization of universities. Drawn from the neo-rationalism perspective on the interactions between actors and higher education systems, the ‘gigogne’ concept of the academic arenas and coupling / decoupling processes, the analysis focuses on the case study of the development, implementation and adjustment of academic workload model. The methodology applied is based on long-term participant observation, action research and case study approaches. It is mixing quantitative analysis of the transformation of the academics’ performance and structure with the university’s achievement. On the other hand, this quantitative approach is complimented with the qualitative analysis of data gathered through formal interviews and focus groups, conducted with academics, senior management of the university and as well as experts of the higher education system in Malaysia and globally.Conclusions from the findings demonstrate – at the organizational level of the university - the capability of negotiation of the academics and senior management with regards to their roles and conditions of career advancement is central in the instrumentation of the academic workload system. At the national level, it highlights the complementary action between public and private higher education institutions. At the international level, it stresses on the capability of adjustment of the university organization system and the Malaysian higher education policy to redefine itself in regulating its position at the arenas of international bodies in higher education
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Aasaraai, A. "Geometric models in linear control theory : On disturbance decoupling in descriptor systems." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234563.
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Moog, Claude. "Inversion, decouplage, poursuite de modele des systemes non lineaires." Nantes, 1987. http://www.theses.fr/1987NANT2030.
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Analyse des systemes non lineaires et leur commande par bouclage dynamique par approches structurelle et algebrique differentielles. Etude de l'inversion des systemes non lineaires a partir de notions algebriques et obtention de facon algorithmique de la structure a l'infini pour une classe generales de systemes non lineaires d'ou l'extension d'une liste d'invariants definie dans le cas de systemes lineaires invariants
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Maurer, Simon. "Analysis and coordination of mixed-criticality cyber-physical systems." Thesis, University of Hertfordshire, 2018. http://hdl.handle.net/2299/21094.
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A Cyber-physical System (CPS) can be described as a network of interlinked, concurrent computational components that interact with the physical world. Such a system is usually of reactive nature and must satisfy strict timing requirements to guarantee a correct behaviour. The components can be of mixed-criticality which implies different progress models and communication models, depending whether the focus of a component lies on predictability or resource efficiency. In this dissertation I present a novel approach that bridges the gap between stream processing models and Labelled Transition Systems (LTSs). The former offer powerful tools to describe concurrent systems of, usually simple, components while the latter allow to describe complex, reactive, components and their mutual interaction. In order to achieve the bridge between the two domains I introduce the novel LTS Synchronous Interface Automaton (SIA) that allows to model the interaction protocol of a process via its interface and to incrementally compose simple processes into more complex ones while preserving the system properties. Exploiting these properties I introduce an analysis to identify permanent blocking situations in a network of composed processes. SIAs are wrapped by the novel component-based coordination model Process Network with Synchronous Communication (PNSC) that allows to describe a network of concurrent processes where multiple communication models and the co-existence and interaction of heterogeneous processes is supported due to well defined interfaces. The work presented in this dissertation follows a holistic approach which spans from the theory of the underlying model to an instantiation of the model as a novel coordination language, called Streamix. The language uses network operators to compose networks of concurrent processes in a structured and hierarchical way. The work is validated by a prototype implementation of a compiler and a Run-time System (RTS) that allows to compile a Streamix program and execute it on a platform with support for ISO C, POSIX threads, and a Linux operating system.
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Feuillet, Thomas. "Développement de capteurs optimisés pour l'IRM à champ magnétique faible (0.2T) : application à l'imagerie de l'animal." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10302/document.
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L'imagerie par résonance magnétique (IRM) appliquée au domaine vétérinaire exploite des systèmes à bas champ magnétostatique qui ont de nombreux avantages, notamment leur faible coût d'achat et d'entretien. Mais sur ces machines, les capteurs radiofréquence (RF) sont initialement dédiées à l'homme et ne permettent pas une qualité d'image optimale. Dans le cadre de cette thèse, des méthodes simples d'optimisation de capteurs à 0,2 T ont été développées, puis exploitées pour des applications de recherche et préclinique. Le travail d'optimisation a été partagé en deux axes. Dans un premier temps, un modèle analytique a été développé sous MATLAB pour l'estimation du rapport signal sur bruit intrinsèque à un capteur paramétré par ses dimensions et les propriétés de l'objet imagé. La validation du modèle a été obtenue par la comparaison entre mesures et simulations du facteur de qualité. Cette méthode d'optimisation a été appliquée pour deux études spécifiques qui ont fait l'objet d'une publication. Dans un second temps, un travail sur le découplage actif a été mené. En effet, sur l'IRM 0,2 T à notre disposition, le découplage passif est la méthode retenue par le constructeur. Mais pour certaines applications des artefacts d'imagerie sont inévitables et le facteur de qualité réduit. Des moyens de découplage actif ont donc été développés. Les performances des capteurs ainsi équipés se sont avérées meilleures qu'en découplage passif. Ce système de découplage associé à un dispositif de connexion par couplage inductif du signal de résonance magnétique a été également démontré à 3 T comme une preuve de concept d'un dispositif de connexion universelle. Ce dispositif a fait l'objet d'un article récemment soumis pour publication<br>Magnetic resonance imaging {MRl) in veterinary practice employs low magnetostatic field devices which have numerous advantages such as their low maintenance and initial cost. Yet, the radiofrequency {RF) coils commercially provided with these devices are dedicated to human morphology, therefore reducing image quality. ln this work, simple optimization methods for 0.2 T RF coils were developed for an implementation in research and preclinical studies. Optimization protocol was subdivided into two main steps. First, an analytical model was developed using MATLAB in order to estimate the intrinsic signal to noise ratio variations with coil and imaged sample characteristics. Validation of the model was assessed thanks to quality factor comparison between simulated and measured values. The use of the analytical model for two specific studies was described in a recently accepted publication. Second, active decoupling was investigated. lndeed, passive decoupling is the decoupling method implemented on the 0.2 T MR device at our disposal. However, this technique can lack of efficiency in some experiments, inducing imaging artifacts and reduced quality factor. Active decoupling method was therefore implemented. The electronic performances of the coils equipped this way were better than in passive decoupling. This active decoupling device combined with an inductive coupling connecting system was tested at 3 T to demonstrate the technical feasibility of a new universal connecting device, for which an article was recently submitted
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Dias, Samaherni Morais. "Controle adaptativo robusto para um modelo desacoplado de um rob? m?vel." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15138.
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Previous issue date: 2010-02-01<br>This thesis presents a new structure of robust adaptive controller applied to mobile robots (surface mobile robot) with nonholonomic constraints. It acts in the dynamics and
kinematics of the robot, and it is split in two distinct parts. The first part controls the robot dynamics, using variable structure model reference adaptive controllers. The second part controls the robot kinematics, using a position controller, whose objective is to make the robot to reach any point in the cartesian plan. The kinematic controller is based only on
information about the robot configuration. A decoupling method is adopted to transform the linear model of the mobile robot,
a multiple-input multiple-output system, into two decoupled single-input single-output systems, thus reducing the complexity of designing the controller for the mobile robot.
After that, a variable structure model reference adaptive controller is applied to each one of the resulting systems. One of such controllers will be responsible for the robot position and the other for the leading angle, using reference signals generated by the position controller. To validate the proposed structure, some simulated and experimental results using differential drive mobile robots of a robot soccer kit are presented. The simulator uses the main characteristics of real physical system as noise and non-linearities such as deadzone
and saturation. The experimental results were obtained through an C++ program applied to the robot soccer kit of Microrobot team at the LACI/UFRN. The simulated and experimental results are presented and discussed at the end of the text<br>Esta tese apresenta o desenvolvimento de uma nova estrutura de controlador adaptativo robusto aplicado a sistemas rob?ticos m?veis com rodas (rob? m?vel de superf?cie) e restri??es n?o-holon?micas de movimento. Este controlador atua tanto na din?mica como na cinem?tica do rob?, e pode ser dividido em duas partes distintas. A primeira parte controla a din?mica, atrav?s da utiliza??o de controladores adaptativos por modelo
de refer?ncia e estrutura vari?vel. A segunda parte controla a cinem?tica do rob? atrav?s de um controlador de posi??o, cujo objetivo ? fazer com que o rob? seja capaz de atingir um ponto qualquer no plano cartesiano, sendo que este controlador cinem?tico ? baseado apenas em informa??es da configura??o do rob?. O trabalho aplica um m?todo de desacoplamento para transformar o modelo linear do rob? m?vel, que ? um sistema com m?ltiplas entradas e m?ltiplas sa?das, em dois sistemas
desacoplados com apenas uma entrada e uma sa?da cada um, para reduzir a complexidade do projeto do controlador. Em seguida, aplica-se um controlador adaptativo por modelo
de refer?ncia e estrutura vari?vel a cada um dos sistemas resultantes. Um controlador ser? respons?vel pelo posicionamento e o outro pela orienta??o do rob?, sendo que estes controladores utilizam como refer?ncias sinais provenientes do controlador cinem?tico de posi??o.
Para comprovar o funcionamento da estrutura proposta, obteve-se resultados simulados e experimentais para o rob? m?vel com acionamento diferencial de um kit de futebol
de rob?s. O simulador possui as principais caracter?sticas do sistema f?sico real, dentre as quais podem-se destacar os ru?dos de entradas e as n?o-linearidades como zona morta e satura??o. Os resultados experimentais foram obtidos atrav?s de um programa desenvolvido em C++ e aplicado a um kit de futebol de rob?s da empresa Microrobot no Laborat?rio de Acionamento, Controle e Instrumenta??o da Universidade Federal do Rio Grande do Norte (LACI/UFRN). Os resultados simulados e experimentais s?o apresentados e discutidos ao final da tese
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Fernandes, Marcus Vin?cius Ara?jo. "Controlador adaptativo por modelo de refer?ncia e estrutura vari?vel aplicado ao controle de ?ngulo de carga e fluxo de campo de um gerador s?ncrono." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18564.
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Previous issue date: 2008-10-23<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Resumo<br>Nesta disserta??o de mestrado ? apresentada uma aplica??o do Controlador Adaptativo por Modelo de Refer?ncia e Estrutura Vari?vel em um Gerador S?ncrono conectado a um barramento infinito, para o controle do ?ngulo de carga e fluxo de campo deste gerador. Uma teoria de desacoplamento ? usada no modelo do Gerador S?ncrono para se obter dois subsistemas, onde o ?ngulo de carga e o fluxo de campo podem ser controlados independentemente. A avalia??o da estrat?gia de controle proposta ser? realizada atrav?s de simula??es para o modelo desacoplado do Gerador S?ncrono. Tamb?m ser? feita uma compara??o com os controladores Proporcional Derivativo aplicado ao Gerador S?ncrono desacoplado e Proporcional Integrativo Derivativo aplicado ao Gerador S?ncrono acoplado, sendo este ?ltimo, o sistema vigente hoje no Brasil. Os resultados das simula??es comprovar?o a efici?ncia e robustez desta estrat?gia de controle
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Sifi, Mohcine. "Diagnostic à base de modèles non linéaires. : Application au circuit carburant d'une turbomachine." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0054/document.
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Les systèmes de régulation des turbomoteurs actuels sont basés sur des architectures complexes que les constructeurs tendent à rendre plus modulaires avec des technologies plus économiques tout en garantissant un niveau de fiabilité supérieur ou égal. Dans ce contexte, la surveillance du circuit carburant, qui a pour but de déceler les dysfonctionnements des composants hydrauliques critiques, permet de réduire le coût de maintenance, d'améliorer le niveau de maintenabilité et d'assurer la disponibilité des turbomoteurs. La présente étude porte sur l'élaboration de méthodes de diagnostic performantes et robustes permettant la détection et la localisation des défauts impactant les fonctions hydrauliques primaires du circuit carburant. Des méthodes existantes de génération de résidus à base de modèles non linéaires sont présentées et appliquées au cas du circuit carburant. L'approche analytique pour le découplage, combinée avec des filtres de Kalman étendus, permet la structuration des résidus pour assurer la localisation des défauts. Une nouvelle approche basée sur la théorie de platitude différentielle est proposée pour le diagnostic de défauts des systèmes non linéaires avec une application au cas du circuit carburant. Les différentiateurs à modes glissants sont utilisés pour l'estimation des dérivées de signaux nécessaires à l'application de certaines méthodes de génération de résidus. Des simulations numériques illustrent la pertinence des résultats obtenus. Une application expérimentale est présentée en utilisant un jeu de données réelles issues d'un banc d'essais partiel et fournies par la société Turbomeca du groupe SAFRAN<br>The current gas turbine regulation systems are based on complex architectures that manufacturers tend to make more modular with more cost effective technologies while ensuring a greater or equal level of reliability. In this context, the fuel system health monitoring, which aims to identify critical hydraulic components dysfunction, allows to reduce maintenance costs, to improve maintainability level and to ensure gas turbine availability. The present study focuses on the development of performant and robust diagnosis methods for the detection and isolation of faults affecting primary fuel system hydraulic functions. Existing nonlinear model based residual generation methods are presented and applied to the fuel system. The analytical approach for decoupling, combined with extended Kalman filters, helps fault isolation by generating residual structures. A new approach based on differential flatness theory is proposed for nonlinear systems fault diagnosis with an application to the fuel system. Sliding mode differentiators are used to estimate derived signals that are necessary for the application of some residual generation methods. Numerical simulations illustrate the efficiency of obtained results. An experimental application is presented using a real data set from a partial test bench provided by Turbomeca company of the SAFRAN group
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Oliveira, Odailson Cavalcante de. "Desacoplamento de um gerador s?ncrono atrav?s de um controle adaptativo por modelo de refer?ncia baseado em fun??es de Base radial." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15386.
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Previous issue date: 2011-07-28<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>An alternative nonlinear technique for decoupling and control is presented. This technique
is based on a RBF (Radial Basis Functions) neural network and it is applied to the
synchronous generator model. The synchronous generator is a coupled system, in other
words, a change at one input variable of the system, changes more than one output. The
RBF network will perform the decoupling, separating the control of the following outputs
variables: the load angle and flux linkage in the field winding. This technique does not
require knowledge of the system parameters and, due the nature of radial basis functions,
it shows itself stable to parametric uncertainties, disturbances and simpler when it is applied
in control. The RBF decoupler is designed in this work for decouple a nonlinear
MIMO system with two inputs and two outputs. The weights between hidden and output
layer are modified online, using an adaptive law in real time. The adaptive law is developed
by Lyapunov s Method. A decoupling adaptive controller uses the errors between
system outputs and model outputs, and filtered outputs of the system to produce control
signals. The RBF network forces each outputs of generator to behave like reference
model. When the RBF approaches adequately control signals, the system decoupling is
achieved. A mathematical proof and analysis are showed. Simulations are presented to
show the performance and robustness of the RBF network<br>Neste trabalho, ser? apresentada uma t?cnica alternativa para o desacoplamento e controle
de sistemas n?o lineares. A estrat?gia de desacoplamento proposta est? baseada
numa rede neural RBF (Radial Basis Functions) combinada com o controle adaptativo
por modelo de refer?ncia. A t?cnica ? aplicada no controle do modelo de um gerador
s?ncrono, cujas vari?veis de sa?da s?o o ?ngulo de carga e o fluxo concatenado no enrolamento
de campo. O sistema do gerador s?ncrono ? acoplado, ou seja, a mudan?a
numa das vari?veis de entrada do sistema altera mais de uma vari?vel de sa?da. A rede
RBF realizar? o desacoplamento do sistema, fazendo o controle de forma independente
de cada uma das sa?das. Tal estrat?gia n?o exige conhecimento dos par?metros do sistema
e observa-se um comportamento est?vel da rede RBF, tanto na presen?a de incertezas na
modelagem, como de perturba??es no sistema. Ser? mostrada a simplicidade da aplica??o
da t?cnica e do projeto da rede RBF. Os pesos, que interligam as camadas oculta
e de sa?da da rede, s?o ajustados utilizando uma lei adaptativa em tempo real. Essa lei
adaptativa foi desenvolvida pelo m?todo de fun??es de energia de Lyapunov. O sistema
de controle e desacoplamento faz uso dos sinais filtrados da sa?da do gerador e dos sinais
dos erros entre as sa?das do gerador e as sa?das do modelo refer?ncia. Assim, atrav?s dos
sinais de controle aplicados pela rede RBF, cada sa?da do sistema do gerador ? for?ada a
se comportar conforme uma din?mica desejada, dada pelo modelo de refer?ncia. Quando
a rede RBF aproxima adequadamente os sinais de controle, o desacoplamento do sistema
? alcan?ado. Os resultados do desempenho da estrat?gia ser?o apresentados atrav?s de
simula??es. Tamb?m ser? mostrada a prova matem?tica de estabilidade do sistema em
malha fechada para o caso escalar
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Hung, Jui-Hsiang. "Efficient computational strategies enabling insights into the glass transition." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512640511831277.
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Ahlersten, Krister. "Empirical asset pricing and investment strategies." Doctoral thesis, Stockholm : Economic Research Institute, Stockholm School of Economics [Ekonomiska forskningsinstitutet vid Handelshögskolan i Stockholm] (EFI), 2007. http://www2.hhs.se/efi/summary/726.htm.
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Shang, Ying. "Semimodule morphic systems realization, model matching, and decoupling /." 2006. http://etd.nd.edu/ETD-db/theses/available/etd-07072006-112504/.
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Thesis (Ph. D.)--University of Notre Dame, 2006.<br>Thesis directed by Michael K. Sain for the Department of Electrical Engineering. "July 2006." Includes bibliographical references (leaves 229-233) and index.
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Yun-Ju, Chang, and 張筠茹. "Design of Decoupling Model Predictive Control and PID Controllers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9j7f3s.
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碩士<br>國立臺北科技大學<br>化學工程研究所<br>104<br>Most industrial processes are multivariable systems which often present complicated interactions between controlled and manipulated variables. A multivariable system with strong interactions between the channels can be much more difficult to control, and the decoupling control by designing a decoupler to minimize the process interactions is advised. However, the ideal decouplers have complicated structures and are not always physically realizable. Model predictive control (MPC) has become the method of choice in several process industries to solve difficult multivariable control problems that include inequality constraints. However, the conventional MPC design does not explicitly address the process interactions so that satisfactory decoupling performance cannot be attained. This study proposes a novel design approach that incorporates the concept of decoupling control into MPC controller using the dynamic matrix model and extended non-minimal state space model. This decoupling MPC design achieves the condition of decoupling control without adding any decouplers. Furthermore, this study applies the decoupling MPC design to the on-line tuning of multivariable PID controllers. In this way, decoupling control can be achieved by implementing simple multivariable PID controllers without adding decouplers. Simulation results demonstrate the effectiveness of the proposed design of decoupling model predictive control.
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Hung-TingPan and 潘竑廷. "Implementation and Control Design of a Power-Assisted Wheelchair using Dynamic Decoupling Model." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/28832295633547894411.
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Mantilla, Bruno A. "A computational model of spasticity based on a decoupling of the alpha and gamma efferents." Thesis, 2002. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2002-035.
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Guo, Geng-Lin, and 郭畊麟. "Applications of Fuzzy Brain Emotional Cerebellar Model Articulation Controller for SIMO Nonlinear System Decoupling Control." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/p946yp.
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碩士<br>元智大學<br>電機工程學系<br>106<br>In this thesis, a Fuzzy Brain Emotional Cerebellar Model Articulation Controller (FBECMAC) is designed for the decoupling nonlinear systems. For the underactuated systems, the decoupling sliding-mode technique is used to achieve the decoupling control performance. The FBECMAC combines cerebellar model with a brain model to introduce a new neural network model, which imitates the judgment of a cerebellar and the emotion of a brain. The brain has an amygdala cortex and a prefrontal cortex, so that the FBECMAC contains two neural networks; the amygdala cortex is a sensory neural network and the prefrontal cortex is an emotional neural network. The proposed FBECMAC has learning ability and can adjust parameters to achieve efficient control performance. The proposed control system is comprised of a FBECMAC and an auxiliary compensation controller. The FBECMAC is used as the main controller to approximate an ideal controller to achieve desired control performance and the auxiliary compensation controller is utilized to attenuate the residual approximation error to achieve system stability. Finally, the FBECMAC control system is used to control a ball-beam system, a Translational Oscillations with a Rotational Actuator(TORA) system, a bridge-crane, an aeroelastic structure system and a double-inverted pendulum system to confirm the validity of the proposed approach.
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Liao, Wei-Yi, and 廖維苡. "Explaining the Great Decoupling of the Equity-Bond Linkage with a Modified Dynamic Conditional Correlation Model." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/82282015167493734999.
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碩士<br>國立交通大學<br>經營管理研究所<br>96<br>We develop a new, modified Dynamic Conditional Correlation (DCC) model, called DCCX,which allows exogenous variables in the evolution of the conditional correlations in the
standard DCC model of Engle (2002). Structural modeling of the dynamic conditionalcorrelations enriches the standard DCC, which is basically a reduced-form model. We apply this new model to explain temporal variations of the correlation between the stock and bond returns in U.S. Throughout the nineties until 1997/1998, we find a high positive correlation in the neighborhood of 0.3 to 0.6, exhibiting a stable and close relationship between returns of the S&P500 and 10-year-treasury-bonds. However, a sharp decline in the equity-bond correlation occurred in 1997/1998, followed by a sudden reversion, then plunged back to the negative range in 2000. Such a great decoupling of the equity-bond correlation persisted until 2007. The correlation in the twenties fluctuates widely but mostly remains in the negative range of -0.2 to -0.5, a stark contrast to the high positive correlation in the nineties. Using the DCCX model, we find such a dramatic variation in the equity-bond relationship can be partly explained by the stock market uncertainty (measured by CBOE’s VIX) and the liquidity of the market (measured by the turnover of S&P500). Specifically, the surge of the VIX in the late nineties and the speedup of the stock turnovers both contributed to the drop in the stock-bond correlations in the last decade. It is suggested that stock market uncertainty has important cross-market pricing influences and that stock-bond diversification benefits increase with stock market uncertainty. On the other hand, sudden shifts of asset correlations may also call for necessary rebalancing of great magnitude on hedging positions and the grave danger of inactions. The recent sub-prime crisis may be viewed as a case in point.
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Wu, Dong-Rong, and 吳東榮. "The Development of a Customer Order Decoupling Point Evaluation Model- Semiconductor Equipment Company as a Case." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77285534380262274591.
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碩士<br>中原大學<br>工業與系統工程研究所<br>99<br>Abstract
Semiconductor market is highly affected by globalization, and the customers of semiconductor equipment products become are very diverse. Therefore, customization of equipment products has to have accurate results, more and more and sales forecast in has become harder.
While forecasting errors happened, most equipment manufacturer was using a simple rule to solve this kind of problem. If forecasting number was not correct or excess demand occurred, the manufacturer would consider as the decision factors similarity of the products and the work-in-process (WIP) numbers in the plant. If there is a rush order, and the work-in-process number is lower than the demand, order of the regular order with similar devices will be disassembled to fulfill this rush order. Although urgent order can be delivered on time in this way, the other orders may be late accordingly.
In this study, to solve inaccurate forecasting or excess demand problems, the cost model based on the customer order decoupling point was developed to minimize production cost and fulfill customer satisfaction. This model would determine the customer order decoupling point, and decide whether to disassemble similar products to meet the customer requirements.
There three phases in this project, the first phase is to observe the production line and the product structure, to define research objectives, research scope and limitations. In the second phase, the cost model with customer order decoupling point is constructed and verified. In the third stage, the sensitivity analysis is performed and the results will be given to the company as the reference.
In this study, the customer order decoupling point cost model was developed, and validated which might various factors affect production costs, was tested and several guidelines were developed to help the company making decision various situations.
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Chakraborty, Oindrilla. "Decoupling Controller Design Based on Gain and Phase Margin Specifications for a Coupled Tank System Model." Thesis, 2016. http://ethesis.nitrkl.ac.in/8456/1/2016_MT_214EE3231_OChakraborty.pdf.
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The objective of a multi-variable control involves maintaining various control variables at independent set points. The interactions present in the system affects more than one controlled variables because of the manipulated variable. Decouplers are designed to reduce the interactions in between the loops in to achieve a satisfactory responses when there is presence of non-minimum phase zeros,multiple time delays and large uncertainty. The dynamic and static decoupling are the two types of decoupling strategies. In this thesis, these control strategies are discussed. In practice, there exists certain process unmodelled dynamics. Hence, there is a necessity to examine the robust stability of a system to check whether the control system stability is ascertained in presence of these unmodelled dynamics. This thesis deals with designing a controller along with decoupler to achieve the desired performance of a TITO system. At first, a decoupler is being designed from the plant matrix. Then, a first order plus dead time model is obtained for each of the decoupled process on the basis of the frequency response fitting. After getting the FOPDT model a decentralized PI/PID controller for each reduced order decoupled model is designed to obtain desired gain and phase margins. The present technique is applied to a coupled tank system. The characteristics like non-minimum phase and non-linear characteristics make the control of coupled tank liquid level system, a standout amongst the most difficult benchmark control problems. The main objective of the coupled tank system is to maintain a desired level of liquid in the two tanks independent of each other when the water enters the tank and when the water flows out. The coupling impact here in this framework is a coupling switch that permits stream of water in the tank at higher level to a tank at lower level. Lastly, robust stability of the control system is analyzed in the presence of various process uncertainties like additive uncertainty and multiplicative uncertainties. The stability analysis is examined using the small gain theorem or the spectral radius criterion. The robust stability of the coupled tank system is also determined.
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Khan, Nafisah. "Decentralized state-space controller design of a large PHWR." Thesis, 2009. http://hdl.handle.net/10155/71.
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The behaviour of a large nuclear reactor can be described with sufficient accuracy using a
nodal model, like the spatial model of a 540 MWe large Pressurized Heavy Water
Reactor (PHWR). This model divides the reactor into divisions or nodes to create a
spatial model in order to control the xenon induced oscillations that occur in PHWRs.
However, being such a large scale system, a 72nd-order model, it makes controller design
challenging. Therefore, a reduced order model is much more manageable. A convenient
method of model reduction while maintaining the important dynamics characteristics of
the process can be done by decoupling. Also, due to the nature of the system,
decentralized controllers could serve as a better option because it allows each controller
to be localized. This way, any control input to a zone only affects the desired zone and
the zones most coupled with, thus not causing a respective change in neutron flux in the
other zones.
In this thesis, three decentralized controllers were designed using the spatial model of a
540 MWe large PHWR. A decoupling algorithm was designed to divide the system into
three partitions containing 20, 27, and 25 states each. Reduced order sub-systems were
thus created to produce optimal decentralized controllers. An optimal centralized
controller was created to compare both approaches. The decentralized versus centralized
controllers’ system responses were analyzed after a reactivity disturbance. A fail-safe
study was done to highlight one of the advantages of decentralized controllers.<br>UOIT
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Dvořák, Martin. "Monetární transmisní mechanizmus: pohled do černé skříňky." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-338190.
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The recent economic and financial turmoil has led central banks around the world to heavily utilize unconventional monetary policy measures. Unconventional in this sense means a deflection from traditional central bank policy measures, i.e. interest rate innovations. Although these measures were widely discussed, the uniformed, coherent and comprehensive framework of such measures is still missing. The aim of this thesis is to establish the framework for possible classification of such policies together with transmission channels to the real economy. The empirical part examines the impacts of unconventional policies on real data using vector autoregression and vector error correction models. This analysis is based on monthly data period between 1999 and 2013, which is strongly affected by implementation of the unconventional policies in its second half. The last section examines the possible future of these policies as a normal instrument of central banks and describes their main challenges and shortcomings. JEL classification: C32, E40, E44, E50, E52, E58, E60 Keywords: Unconventional monetary policy, Interest rate, Decoupling principle, Balance sheet policy stratification, Quantitative easing, Channels of transmission, Vector Autoregression, Vector error correction model Author's e-mail:...
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Jang, Ian Been, and 張豔鬢. "Analysis of Structural Coupling And Decoupling Problems Using Generalized Modal Force Technique." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/08464301616300732559.
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碩士<br>逢甲大學<br>自動控制工程研究所<br>84<br>To design a structure, it is often required to add or
extract a substructure to meet the design criteria without re-
analyzing the changed structure. Many component synthesis
methods are developed in recent years, but only Inamura and
Dowell discuss the decoupling technique. It directly deal with
the mass and stiffness matrices for finite element analysis.
Recently, Yee, Tsuei and Lin developed a component synthsis
method named Modal Force Technique. It directly works with the
frequency response functions at joint to predict the dynamic
behavior of a synthesized structure. By using this method, fewer
orders of the system matrix, no matrix inversion and the system
matrix containing both of the system and substructure modes are
its privileges. These features can be applied to the dynamic
decoupling. A very similar concept of the Modal Force Technique
is used to derive the decoupled system equation. The
eigensolution of this decoupled system gives the natural
frequency and corresponding eigenvector of the decoupled
structure. Futher investigating these coupled and decoupled
system equations, a generalized Modal Force Technique can be
summarized for structural analysis both in the area of coupling
and decoupling. To illustrate the
generalized Modal Force Technique, a lumped system and a beam
structure are presented. The numerical results indicate that the
generalized Modal Force Technique is effective in dynamic
coupling as well as in dynamic decoupling and can be used in
structural analysis and design.
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Zhang, Qichun, and A. Wang. "Decoupling control in statistical sense: minimised mutual information algorithm." 2016. http://hdl.handle.net/10454/17337.
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No<br>This paper presents a novel concept to describe the couplings among the outputs of the stochastic systems which are represented by NARMA models. Compared with the traditional coupling description, the presented concept can be considered as an extension using statistical independence theory. Based on this concept, the decoupling control in statistical sense is established with the necessary and sufficient conditions for complete decoupling. Since the complete decoupling is difficult to achieve, a control algorithm has been developed using the Cauchy-Schwarz mutual information criterion. Without modifying the existing control loop, this algorithm supplies a compensative controller to minimise the statistical couplings of the system outputs and the local stability has been analysed. In addition, a further discussion illustrates the combination of the presented control algorithm and data-based mutual information estimation. Finally, a numerical example is given to show the feasibility and efficiency of the proposed algorithm.