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Dissertations / Theses on the topic 'Fuzzy variance'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Adewunmi, Adrian. "Selection of simulation variance reduction techniques through a fuzzy expert system." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11260/.

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In this thesis, the design and development of a decision support system for the selection of a variance reduction technique for discrete event simulation studies is presented. In addition, the performance of variance reduction techniques as stand alone and combined application has been investigated. The aim of this research is to mimic the process of human decision making through an expert system and also handle the ambiguity associated with representing human expert knowledge through fuzzy logic. The result is a fuzzy expert system which was subjected to three different validation tests, the

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Lu, I.-Chen (Jennifer). "Robust portfolio management with multiple financial analysts." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18045.

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Portfolio selection theory, developed by Markowitz (1952), is one of the best known and widely applied methods for allocating funds among possible investment choices, where investment decision making is a trade-off between the expected return and risk of the portfolio. Many portfolio selection models have been developed on the basis of Markowitz's theory. Most of them assume that complete investment information is available and that it can be accurately extracted from the historical data. However, this complete information never exists in reality. There are many kinds of ambiguity and vaguenes

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3

Visa, Sofia. "Comparative Study of Methods for Linguistic Modeling of Numerical Data." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1043254774.

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4

Abdullah, Rudwan Ali Abolgasim. "Intelligent methods for complex systems control engineering." Thesis, University of Stirling, 2007. http://hdl.handle.net/1893/257.

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This thesis proposes an intelligent multiple-controller framework for complex systems that incorporates a fuzzy logic based switching and tuning supervisor along with a neural network based generalized learning model (GLM). The framework is designed for adaptive control of both Single-Input Single-Output (SISO) and Multi-Input Multi-Output (MIMO) complex systems. The proposed methodology provides the designer with an automated choice of using either: a conventional Proportional-Integral-Derivative (PID) controller, or a PID structure based (simultaneous) Pole and Zero Placement controller. The

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Li, Xiang. "Variable modeling of fuzzy phenomena with industrial applications." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/4383.

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6

Kwan, Alvin Chi Ming. "A framework for mapping constraint satisfaction problems to solution methods." Thesis, University of Essex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339436.

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7

Naidoo, Puramanathan. "The control of a multi-variable industrial process, by means of intelligent technology." Thesis, Port Elizabeth Technikon, 2001. http://hdl.handle.net/10948/48.

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Conventional control systems express control solutions by means of expressions, usually mathematically based. In order to completely express the control solution, a vast amount of data is required. In contrast, knowledge-based solutions require far less plant data and mathematical expression. This reduces development time proportionally. In addition, because this type of processing does not require involved calculations, processing speed is increased, since rule process is separate and all processes can be performed simultaneously. These results in improved product quality, better plant effici

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8

Pokorný, Tomáš. "Využití teorie fuzzy množin a jejich rozšíření v metodě TOPSIS." Master's thesis, Vysoká škola ekonomická v Praze, 2016. http://www.nusl.cz/ntk/nusl-205686.

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This master's thesis deals with extensions of TOPSIS method, which is one of methods for multi-criteria evaluation of alternatives. These extensions use theory of fuzzy sets (FS) and their futher extensions to interval-valued (IVFS), intuitionistic (IFS) and hesitant (HFS) fuzzy sets and their combinations (IVIFS, IVIHFS). Significant part of this thesis explains the principle of fuzzy sets and their generalizations. Descriptions of operators for aggregations of grades of membership has very important role here. Next, very short description of multi-criteria evaluation problems and detailed de

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9

Nyongesa, Henry Okola. "Genetic based machine learning allied to multi-variable fuzzy control of anaesthesia." Thesis, University of Sheffield, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295759.

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Khor, Jeen Ghee. "An intelligent controller for synchronous generators." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4125.

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11

Thomas, Michael Brian. "Advanced servo control of a pneumatic actuator." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1070373448.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xix, 222 p.; also includes graphics (some col.) Includes bibliographical references (p. 215-222). Available online via OhioLINK's ETD Center

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Klug, Michael. "Realimentação dinâmica de saídas com parâmetros variantes e aplicação aos sistemas fuzzy Takagi-Sugeno." Florianópolis, SC, 2010. http://repositorio.ufsc.br/xmlui/handle/123456789/94590.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia de Automação e Sistemas, Florianópolis, 2010<br>Made available in DSpace on 2012-10-25T12:50:35Z (GMT). No. of bitstreams: 1 286684.pdf: 13590420 bytes, checksum: 9e2232e690d637ecdfb3f9e1c5f772ff (MD5)<br>Apresenta-se uma metodologia sistemática visando estudar e computar leis de controle para determinadas classes de sistemas não lineares em tempo discreto. Para modelar o sistema não linear utiliza-se do método fuzzy Takagi-Sugeno, descrevendo a planta como a combinação

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13

Ting, Sio Weng. "Advanced control approaches for time-variant system : fuzzy logic control and adaptive inverse control." Thesis, University of Macau, 1997. http://umaclib3.umac.mo/record=b1445630.

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14

Calderon, Chavez Juan Manuel. "Impact Force Reduction Using Variable Stiffness with an Optimal Approach for Jumping Robots." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6615.

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Running, jumping and walking are physical activities that are performed by humans in a simple and efficient way. However, these types of movements are difficult to perform by humanoid robots. Humans perform these activities without difficulty thanks to their ability to absorb the ground impact force. The absorption of the impact force is based on the human ability to vary muscles stiffness. The principal objective of this dissertation is to study vertical jumps in order to reduce the impact force in the landing phase of the jump motion of humanoid robots. Additionally, the impact force reducti

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15

Mirats, Tur Josep M. (Josep Maria). "Qualitative modelling of complex systems by means of fuzzy inductive reasoning. Variable selection and search space reduction." Doctoral thesis, Universitat Politècnica de Catalunya, 2001. http://hdl.handle.net/10803/6180.

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Fuzzy Inductive Reasoning (FIR) is a modelling and simulation methodology capable of generating a qualitative input-output model of a system from real-valued trajectories of its physical variables. The functioning basis of FIR is to qualitatively learn the behaviour of a system from its past real data. This is an interesting feature when dealing with ill-defined, usually large-scale systems, for which an accurate description is not available but only data trajectories of the process.<br/>FIR finds in a (huge) search space model the so-called optimal mask that indicates which variables best exp

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Lotufo, Francisco Antonio [UNESP]. "Desenvolvimento de um sensor virtual para processos não-lineares e variantes no tempo, com aplicação em planta de neutralização de PH." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105335.

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Made available in DSpace on 2014-06-11T19:34:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-10-22Bitstream added on 2014-06-13T19:24:01Z : No. of bitstreams: 1 lotufo_fa_dr_guara.pdf: 770948 bytes, checksum: 85cf3f28deae1f6244636a7884900791 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Este trabalho apresenta uma metodologia para desenvolvimento de sensores virtuais capazes de inferir variáveis de processos altamente não lineares e variantes no tempo. A metodologia proposta emprega modelagem nebulosa de sistemas dinâmicos complexos, em que a parte

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Silva, Luís Filipe Pereira. "Controle de sistemas não lineares discretos no tempo com atraso variante nos estados utilizando modelos do tipo fuzzy t-s." reponame:Repositório Institucional da UFSC, 2016. https://repositorio.ufsc.br/xmlui/handle/123456789/167626.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia de Automação e Sistemas, Florianópolis, 2016<br>Made available in DSpace on 2016-09-20T04:04:46Z (GMT). No. of bitstreams: 1 339907.pdf: 4176816 bytes, checksum: fb258b4beb123055d5c12a32945229f1 (MD5) Previous issue date: 2016<br>Nesta tese são desenvolvidos resultados de síntese de controladores fuzzy para a estabilização local de sistemas não lineares discretos no tempo com atraso variante nos estados. Para a utilização desses resultados é necessário em um primeiro momento

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Mercaldi, Heitor Vinicius. "Automação de um sistema de pulverização para aplicação de agroquímicos a taxa variada usando injeção direta." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-23012013-143643/.

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Neste trabalho, a automação de um sistema de pulverização a taxa variada com injeção direta é apresentado. A automação do sistema de pulverização montado em uma bancada laboratorial estática foi baseado em um controlador programável com capacidade de tempo real. Os sistemas de pulverização com injeção direta possibilitam o uso de diferentes agroquímicos em uma mesma aplicação, e adicionalmente reduzem os impactos toxicológico e ambiental relacionados com o preparo e descarte da mistura de agroquímico e água. A automação deste sistema envolve o desenvolvimento de placas de interface, a modelage

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Arnaldo, Helo?na Alves. "Novos m?todos determin?sticos para gerar centros iniciais dos grupos no algoritmo fuzzy C-Means e variantes." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18109.

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Made available in DSpace on 2014-12-17T15:48:11Z (GMT). No. of bitstreams: 1 HeloinaAA_DISSERT.pdf: 1661373 bytes, checksum: df9fe39185a27ded472f2f72284acdf6 (MD5) Previous issue date: 2014-02-24<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Data clustering is applied to various fields such as data mining, image processing and pattern recognition technique. Clustering algorithms splits a data set into clusters such that elements within the same cluster have a high degree of similarity, while elements belonging to different clusters have a high degree of dissimilarity. The

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Sanchez, Edinzo J. Iglesias. "Using fuzzy logic to enhance control performance of sliding mode control and dynamic matrix control." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001497.

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21

Lotufo, Francisco Antonio. "Desenvolvimento de um sensor virtual para processos não-lineares e variantes no tempo, com aplicação em planta de neutralização de PH /." Guaratinguetá : [s.n.], 2010. http://hdl.handle.net/11449/105335.

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Orientador: Samuel Euzédice de Lucena<br>Banca: Leonardo Mesquita<br>Banca: Inacio Bianchi<br>Banca: Germano Lambert -Torres<br>Banca: Neusa Maria Franco de Oliveira<br>Resumo: Este trabalho apresenta uma metodologia para desenvolvimento de sensores virtuais capazes de inferir variáveis de processos altamente não lineares e variantes no tempo. A metodologia proposta emprega modelagem nebulosa de sistemas dinâmicos complexos, em que a parte antecedente das regras emprega a técnica de agrupamento (clusterização) de Gustafson-Kessel (product space clustering), e os parâmetros da parte conseqüente

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22

Borovička, Adam. "Vytváření investičního portfolia podílových fondů pomocí fuzzy metod vícekriteriálního rozhodování." Doctoral thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-199395.

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The thesis deals with investment decision making. It starts from the decision making situation about the making of an investment portfolio of the open unit trusts. The whole decision making process is described, namely the methodical approaches used in terms of the portfolio making procedure. Thus, the main part of this paper focuses on a detailed description of an algorithm of the fuzzy weight estimation method, fuzzy multiple criteria evaluation method and fuzzy multiple objective programming method. The methods are proposed on the basis of current concepts; they conclude the new ideas as we

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23

Danishvar, Morad. "Modelling and design of the eco-system of causality for real-time systems." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12105.

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The purpose of this research work is to propose an improved method for real-time sensitivity analysis (SA) applicable to large-scale complex systems. Borrowed from the EventTracker principle of the interrelation of causal events, it deploys the Rank Order Clustering (ROC) method to automatically group every relevant system input to parameters that represent the system state (i.e. output). The fundamental principle of event modelling is that the state of a given system is a function of every acquirable piece of knowledge or data (input) of events that occur within the system and its wider opera

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Nogueira, Samuel Lourenço. "Controladores adaptativos não-lineares com critério H aplicados a manipuladores com restrições de força e posição." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-26022010-152411/.

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Neste trabalho é apresentado um estudo comparativo entre quatro controladores H não lineares aplicados a um manipulador robótico com restrições de força e posição. Para estudar o comportamento de cada controlador as seguintes estratégias foram adotadas: (1) o modelo nominal do robô é considerado conhecido e são utilizadas técnicas inteligentes para estimar incertezas paramétricas, dinâmicas não modeladas e distúrbios externos; (2) O modelo do sistema é considerado completamente desconhecido e as técnicas inteligentes são utilizadas para estimar o modelo completo. As técnicas inteligentes utili

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25

ROCHA, FILHO Orlando Donato. "Modelagem baseada em agrupamento nebuloso evolutivo de máxima verossimilhança aplicada a sistemas dinâmicos operando em ambiente não-estacionário." Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1898.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-09-04T18:35:15Z No. of bitstreams: 1 OrlandoRochaFilho.pdf: 10104010 bytes, checksum: 7c750a6e03597fc2e7f7474b62c35a46 (MD5)<br>Made available in DSpace on 2017-09-04T18:35:15Z (GMT). No. of bitstreams: 1 OrlandoRochaFilho.pdf: 10104010 bytes, checksum: 7c750a6e03597fc2e7f7474b62c35a46 (MD5) Previous issue date: 2017-04-24<br>This thesis presents a maximum likelihood based modeling approach applied to dynamic systems operating in non-stationary environment that uses recursive parametric estimation based on the method of fuzzy instr

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Liu, Shiyong. "Three Essays on Travel Demand Management Strategies for Traffic Congestion Mitigation." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/30097.

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This dissertation provides three essays. In the first essay, a model with two linguistic variables is built to demonstrate the joint effect of multiple linguistic variables in a dynamic modeling context. Triangular membership function is used to represent the linguistic variables and the joint effect is captured through fuzzy inference method. In this essay, the results obtained by employing fuzzy concepts are compared with the results that one would obtain using generic lookup functions. The second essay develops a system dynamics model by which policy makers can assess the impact of vari

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Laclau, Charlotte. "Hard and fuzzy block clustering algorithms for high dimensional data." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB014.

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Notre capacité grandissante à collecter et stocker des données a fait de l'apprentissage non supervisé un outil indispensable qui permet la découverte de structures et de modèles sous-jacents aux données, sans avoir à \étiqueter les individus manuellement. Parmi les différentes approches proposées pour aborder ce type de problème, le clustering est très certainement le plus répandu. Le clustering suppose que chaque groupe, également appelé cluster, est distribué autour d'un centre défini en fonction des valeurs qu'il prend pour l'ensemble des variables. Cependant, dans certaines applications d

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MACÊDO, Ana Vitória de Almeida. "Inclusão de energia eólica em sistemas elétricos e controle de frequência utilizando lógica Fuzzy." Universidade Federal de Campina Grande, 2017. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1549.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-08-24T14:29:39Z No. of bitstreams: 1 ANA VITÓRIA DE ALMEIDA MACÊDO - TESE (PPgEE) 2017.pdf: 3449345 bytes, checksum: ff78e54595b43261343d5050a8dc3e50 (MD5)<br>Made available in DSpace on 2018-08-24T14:29:39Z (GMT). No. of bitstreams: 1 ANA VITÓRIA DE ALMEIDA MACÊDO - TESE (PPgEE) 2017.pdf: 3449345 bytes, checksum: ff78e54595b43261343d5050a8dc3e50 (MD5) Previous issue date: 2017-03-29<br>CNPq<br>Um controle para auxílio do controle de frequência é projetado utilizando um método baseado em lógica fuzzy e no controle do ângulo de pa

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Laclau, Charlotte. "Hard and fuzzy block clustering algorithms for high dimensional data." Electronic Thesis or Diss., Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB014.

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Notre capacité grandissante à collecter et stocker des données a fait de l'apprentissage non supervisé un outil indispensable qui permet la découverte de structures et de modèles sous-jacents aux données, sans avoir à \étiqueter les individus manuellement. Parmi les différentes approches proposées pour aborder ce type de problème, le clustering est très certainement le plus répandu. Le clustering suppose que chaque groupe, également appelé cluster, est distribué autour d'un centre défini en fonction des valeurs qu'il prend pour l'ensemble des variables. Cependant, dans certaines applications d

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30

VELOZO, Hugo Alves. "PROPOSTA DE METODOLOGIA RECURSIVA-ITERATIVA PARA IDENTIFICAÇÃO FUZZY DE SISTEMAS NÃO LINEARES ESTOCÁSTICOS EM MALHA FECHADA." Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1295.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-04-17T12:44:32Z No. of bitstreams: 1 Hugo Alves Velozo.pdf: 5196080 bytes, checksum: 14e9edcc07c0256cf726b1d0f7eb9a02 (MD5)<br>Made available in DSpace on 2017-04-17T12:44:32Z (GMT). No. of bitstreams: 1 Hugo Alves Velozo.pdf: 5196080 bytes, checksum: 14e9edcc07c0256cf726b1d0f7eb9a02 (MD5) Previous issue date: 2017-02-20<br>CAPES<br>Most methods of identifcation of closed-loop dynamic systems are developed for linear and deterministic systems. However, most closed loop systems are nonlinear dynamic systems. In addition, such systems ar

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Kovaříková, Lenka. "Hodnocení investičních možností PRE do malých vodních elektráren." Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-75487.

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In recent years the greater emphasis is placed on the renewable energy sources that are environmentally friendly. Demand for renewable energy sources is supported by government incentives, which leads to an increasing pace of investment in this sector. Prices for electricity from renewable energies are far higher than the prices of conventional electricity. If the current trend continues, it is only a matter of time before they meet. According to this fact, PRE Company decided to invest in hydropower. This thesis deals with identifying of potential investment opportunities in small hydropower

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Гриценко, Костянтин Григорович, Константин Григорьевич Гриценко та Kostiantyn Hryhorovych Hrytsenko. "Оцінювання рівня довіри клієнтів до страхової компанії з використанням теорії нечітких множин". Thesis, Дніпро: Університет митної справи та фінансів, 2018. https://essuir.sumdu.edu.ua/handle/123456789/80651.

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Внаслідок економічної кризи загострилася конкуренція на ринку страхових послуг України. Одним із джерел забезпечення життєздатності страхових компаній є соціальний капітал, основу якого становить довіра клієнтів. Вона суттєво впливає на вибір потенційним клієнтом каналу отримання страхових послуг. Особливо важливе значення для забезпечення життєздатності страхової компанії має адекватне оцінювання рівня довіри клієнтів. Інструментом такого оцінювання є нечітко-множинна модель, що має ієрархічну структуру. Вона дозволяє врахувати як кількісні так і якісні показники, та є зручною для оцінювання

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Гриценко, Костянтин Григорович, Константин Григорьевич Гриценко, Kostiantyn Hryhorovych Hrytsenko та А. М. Посканна. "Оцінювання ефективності діяльності відділень банку з використанням теорії нечітких множин". Thesis, Сумський державний університет, 2018. https://essuir.sumdu.edu.ua/handle/123456789/82929.

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В сучасних умовах функціонування банківської системи України ефективна діяльність банків є запорукою їх існування на ринку банківських послуг. Основним каналом отримання клієнтами банківських послуг є банківське відділення. Організація діяльності його персоналу щодо продажів банківських продуктів суттєво впливає на рівень досягнутих банком результатів у цілому. Тому оцінювання ефективності діяльності відділень банку має особливо важливе значення для забезпечення його життєздатності. Адекватне оцінювання повинно враховувати нечіткість факторів впливу та ступінь впевненості аналітика. Інструмент

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Іванов, Олександр Петрович, Александр Петрович Иванов та Alexander P. Ivanov. "Удосконалення режимів тяги поїздів за вартісними показниками при змінних тарифах на електроенергію". Thesis, Видавництво Дніпропетровського національного університету залізничного транспорту імені академіка В. Лазаряна, 2013. http://eadnurt.diit.edu.ua:82/jspui/handle/123456789/1456.

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Іванов, О. П. Удосконалення режимів тяги поїздів за вартісними показниками при змінних тарифах на електроенергію : авт. дис. к. т. н.: 05.22.07 / О. П. Іванов ; Дніпропетр. нац. ун-т залізн. трансп. ім. акад. В. Лазаряна. - Д. : Вид-во Днiпропетр. нац. ун-ту залізн. трансп. iм. акад. В. Лазаряна, 2013. УДК 629.4.016.12 ГРНТИ 55.41.29 Захист - 22 лютого 2013 р.<br>UK: АНОТАЦІЯ У дисертації отримано нове вирішення комплексного завдання щодо удосконалення режимів тяги вантажних поїздів з урахуванням вартості спожитої активної і реактивної електроенергії в умовах змінних тарифів та оптового

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Shu-Kuang, Chang, and 張曙光. "Methods on Testing Hypotheses of Fuzzy Mean and Fuzzy Variance." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/35917831884062870622.

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博士<br>國立政治大學<br>應用數學研究所<br>95<br>In many expositions of fuzzy methods, fuzzy techniques are described as an alternative to a more traditional statistical approach. In this paper, we present a class of fuzzy statistical decision process in which testing hypothesis can be naturally reformulated in terms of interval-valued statistics. We provide the definitions of fuzzy mean, fuzzy distance as well as investigation of their related properties. We also give some empirical examples to illustrate the techniques and to analyze fuzzy data. Empirical studies show that fuzzy hypothesis testing with s

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Chang, Wen-Han, and 張文瀚. "Fuzzy Controller Design with Variance Constraint and Pole Placement for T-S Fuzzy Systems." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5da62m.

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碩士<br>國立臺灣海洋大學<br>輪機工程學系<br>105<br>In this paper, the fuzzy controller of a nonlinear Tanaka-Sugeno (T-S) fuzzy system with external disturbance is designed to meet the individual state variance constraint, output variance constraint and pole constraint. Based on Lyapunov theorem, the effective condition of the stabilization of the T-S fuzzy system with external disturbance is deduced. These conditions are expressed in the form of linear matrix inequality (LMI). By solving the conditions, we can obtain the fuzzy controller which satisfies the state variance constraint, the output variance cons

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Chiu, Chung-Hung, and 邱政宏. "Adaptive Minimum Variance Control of Stochastic Fuzzy T-S Modes." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/43721473263359126986.

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碩士<br>中華大學<br>電機工程學系(所)<br>95<br>Adaptive minimum variance control for stochastic T-S fuzzy ARMAX model is addressed in this study. From the fuzzy ARMAX model, a fuzzy one-step ahead prediction model is first developed. A stochastic gradient algorithm is then proposed to identify the parameters of the related one-step-ahead predictor. Under the direct adaptive control scheme, minimum variance control is applied to find the control law to make the output track a desired reference signal. Stability and performance of the adaptive stochastic fuzzy control system are rigorously derived. Simulation

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Lou, Yu-Hau, and 羅于豪. "Fuzzy Control of Stochastic Systems with Pole Placement and Variance Constraints." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/xtq729.

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碩士<br>國立中央大學<br>電機工程研究所<br>94<br>This thesis concerns the design problem of fuzzy controllers which guarantee the closed-loop poles within a specified disc and steady-state variance to be less than a set of given upper bounds for continuous T-S fuzzy stochastic systems with parameter uncertainties. Using the linear matrix inequality (LMI) approach, the existence conditions of such T-S fuzzy controllers are derived, but the T-S fuzzy controllers are not unique. A solution to the minimum-effect guaranteed-performance design problem is presented in the sense that the required control effort is mi

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Huang, Bo-Jyun, and 黃柏鈞. "State Variance and Passivity Constrained Fuzzy Controller Design for Nonlinear Stochastic Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77827241338005630843.

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碩士<br>國立臺灣海洋大學<br>輪機工程學系<br>102<br>In stochastic modeling techniques, the Langevin equation is widely applied for describing the behaviors of stochastic systems. The Langevin equation uses the multiplicative noise terms to structure the stochastic systems; hence, the stochastic systems can be considered as bilinear systems. In order to solve this problem, the covariance control theory has been successfully employed to design variance constrained controllers for linear and bilinear stochastic systems. Therefore, the motivation of this thesis is to study the individual state variance constrained

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Chun-YuLin and 林君瑜. "The Construction of the Expected Value and Variance of Fuzzy Random Variable ─ the Application to X_bar-S Control Chart." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/8w82w9.

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碩士<br>國立成功大學<br>工業與資訊管理學系碩博士班<br>101<br>Randomness is the foundation of the traditional statistics which consists in mature theoretical background. Statistics are able to provide appropriate solutions when events appear randomly. However, if the events are classified as fuzzy phenomena, it is difficult to offer a suitable method and explanation for the vague characteristic of the events. Therefore, the relative study of fuzzy random variable has been developed in order to provide proper analysis tools for random experiments for which the outcome is based upon fuzzy observations with real value

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YEH, YI-LIN, and 葉怡麟. "Variance Constrained T-S Fuzzy Controller Design for Nonlinear Stochastic Systems via Observed-State Feedback Gains." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/51956386742249932517.

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碩士<br>國立臺灣海洋大學<br>輪機工程系<br>92<br>A complete approach, which is called covariance control theory, for assigning the entire state covariance matrix to the closed-loop systems via state feedback or output feedback controllers has been developed in past years. However, the systems considered in these literatures are often linear ones. Hence, we will attempt to extend the covariance control theory to nonlinear stochastic systems in this thesis. This thesis discusses a class of continuous-time and discrete-time observer-based nonlinear stochastic systems, which are modeled by the Takagi-Sugeno (T-S)

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Huang, Chiue-Yan, and 黃雀燕. "Variable Control Charts with Fuzzy Data." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69175868493387419101.

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碩士<br>國立高雄應用科技大學<br>工業工程與管理系<br>99<br>Traditionally, variable control charts are constructed based on precise data collected from well-defined quality characteristics of manufacturing products. However, in the real world there are many occasions the stated quality characteristic of products such as surface roughness of optical lens or light transmittance of touch screens contains somewhat degree of imprecise information so that their readings inevitably gather as fuzzy numbers (data). In this situation, the traditional method for constructing the variable control charts exists a limitation of

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Chen, Bing-Tai, and 陳秉泰. "A Fuzzy Control Chart with Variable Sampling Interval." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/55030649337465328956.

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碩士<br>國立雲林科技大學<br>工業工程與管理研究所碩士班<br>93<br>Statistical quality control charts are widely used in monitoring production proc-ess. In this thesis, a variable sampling interval fuzzy control chart is proposed to com-bine Fuzzy set theory and variable sampling interval method to improve the capability of detection in monitoring assignable causes. By using Fuzzy set theory, we can monitor the mean, variance and trend at the same time. By judging stability of the outputs of fuzzy control chart, the variable sampling interval method is adopted to reduce the time for detecting the out of control signal.

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Zeng, Hong Hang, and 曾虹翰. "Adaptive fuzzy controller based on variable universe of discourse." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/87764537645384787540.

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碩士<br>中州技術學院<br>工程技術研究所<br>96<br>Fuzzy logic controller with variable region is a kind of fine self- reacting controller. With a proper expandable and shrinkable factor, its region can change accordingly when input error changes. Thus, its fuzzy rules increase greatly and it becomes more and more sensitive to error when output reaches the expectation. On both dynamic performance indices and stable performance indices, it is found that fuzzy logic controller with variable region is a great improvement upon common fuzzy logic controller, especially on precision of controlling. However, the impro

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Chen, Yung-Chang, and 陳永章. "A Multivariate Fuzzy Control Chart with Variable Sampling Interval." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/24919572063581713976.

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碩士<br>雲林科技大學<br>工業工程與管理研究所碩士班<br>97<br>The research focus on monitoring the multivariate process. The most common used techniques are Hotelling’s T2 control chart for process mean and control chart for process variable. In this study, we conducted a fuzzy inference system, to monitor the process mean vector and covariance matrix simultaneously. Moreover, the concept of variable sampling interval that is adopted to reduce the time for detecting the out of control signals. The results showed that the presented control chart is less effective then Hotelling’s T2 on monitor process mean vector

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Chang, Yung-Sheng, and 張永昇. "Multi-Fuzzy Variable Structure Control for a Biped Locomotion Robot." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94727852798691758226.

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碩士<br>大同大學<br>機械工程研究所<br>91<br>In the beginning, a generation of reference trajectory is designed to obtain a stable locomotion. Based on the desired motion of biped robot, its important postures are plot by CAD, and then the absolute position of every motor (i.e., reference input) is determined. For reducing the impact of grounding and the vibration of motion, creating smoother trajectory (e.g., via cubic interpolation) is constructed. The real dynamics of the biped locomotion robot is the motion in three dimensions (3D) but not in two dimensions (2D). The simplified dynamics based on 2D is n

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Liao, Hsiu-Shan, and 廖秀珊. "Mining Fuzzy Association Rules From Hierarchy Concept with Linguistic Variable." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/99515579566021420566.

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碩士<br>元智大學<br>資訊管理學系<br>97<br>Database is the key technology for current enterprises to store their data. It is not only used for storing information but also mining the unknown information that hidden in the database. There are various kinds of data mining technologies, but the most common one is the association rule. The association rule is mainly used to discuss the association of the purchased products in order to provide reference information for the decision-maker. According to the current researches of the association rule, minimum support and minimum confidence generally use pre-determ

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Liang, Chia-Hao, and 梁家豪. "Fuzzy Control for Brushless DC Motor Drive under Variable Loading." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/49179048866283405780.

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碩士<br>中原大學<br>機械工程研究所<br>94<br>The research is about how to do fuzzy control for brushless DC motor drive under variable loading. By using position detection circuit to replace the original sensor, and collocating with other peripheral circuits to achieve the speed control by DSP. It's difficult to detect the position signal by the position detection circuit at low speed, furthermore, different speed would cause different non-linear phase-lag. Therefore we obtain the particular variation of the phase-lag by experiment, and design the phase compensation to reduce the difference between the dete

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Wang, Fu-Sung, and 王福崧. "Applied Fuzzy Variable Structure Control Law for Active Suspension System Design." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/43290419809207919186.

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碩士<br>逢甲大學<br>機械工程學系<br>88<br>The paper presents the application of Fuzzy Variable Structure Control (FVSC) to design and control an active suspension system. FVSC has an excellent characteristics of robustness. It can make the controlled system track the reference model quickly and suppress the disturbance efficiently by including the control rules of FVSC in the adaptation mechanism of a Model Reference System. That makes the system with high robustness in vibration suppression. By including the look-up table of the fuzzy states in gain switching . The chatter phenomena of the

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Hsu, Feng-Yi, and 許豐益. "Adaptive Fuzzy Variable Structure Control of Nonlinear Systems and Robotic Applications." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/94513279462050975126.

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博士<br>國立臺灣大學<br>電機工程學研究所<br>88<br>In this dissertation, a new adaptive fuzzy control using variable structure control (VSC) concept is proposed to solve model reference adaptive control (MRAC) problems of the nonlinear systems. Instead of taking the tedious coordinate transformation and yielding a ''hard'''' high-gain controller, we introduce smooth B-spline-type membership functions into the controller so as to compensate for the uncertainties much ''softer'''', i.e., in a much smoother and locally weighted manner. To be rigorous, it is shown that the stability of the

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