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Flexible adaptive-network-based fuzzy inference systemXu, Andong. January 2006 (has links)
Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Dept. of Systems Science and Industrial Engineering, 2006. / Includes bibliographical references.
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Projections onto fuzzy convex sets and its application to radiation beam optimization in radiotherapy /Lee, Shinhak, January 1997 (has links)
Thesis (Ph. D.)--University of Washington, 1997. / Vita. Includes bibliographical references (leaves [80]-84).
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Target costing auf Basis unvollkommener Informationen : zu den Möglichkeiten und Grenzen fuzzy-basierter Ansätze im Target costing /Winkler, Andreas. January 2008 (has links)
Zugl.: Regensburg, Universiẗat, Diss., 2008.
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Fuzzy rock typing enhancing reservoir simulation and modeling by honoring high resolution geological models /Gholami, Vida. January 2009 (has links)
Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains xiii, 120 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 89-93).
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Ein stochastisches Simulationsmodell zur Planung der Finanzierung landwirtschaftlicher UnternehmenLüttgens, Bernd. Unknown Date (has links) (PDF)
Universiẗat, Diss., 2004--Bonn.
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Extracting Movement Patterns Using Fuzzy and Neuro-fuzzy ApproachesPalancioglu, Haci Mustafa January 2003 (has links) (PDF)
No description available.
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A Matemática está em tudo: modelagem fuzzy para um problema da indústria e uma proposta de aplicação no Ensino Médio / Mathematics is in everything: fuzzy modeling for an industry problem and an application proposal in High SchoolGayer, Fernanda Almeida Marchini [UNESP] 01 December 2017 (has links)
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Previous issue date: 2017-12-01 / Neste trabalho, apresentamos um estudo introdutório à Teoria de Conjuntos Fuzzy e Lógica Fuzzy, mostrando o seu potencial de aplicação através da análise de um problema numa indústria química e da introdução de alguns conceitos dessa teoria a alunos do Ensino Médio. Quanto ao problema da indústria química, o objetivo é assessorar uma equipe de gestão de manutenção de uma certa indústria química na tomada de decisão quanto ao momento oportuno para realização de intervenção em uma bomba industrial. Esta equipe observou como dificuldade em sua gestão de custos a manutenção preventiva de uma certa bomba de seu processo. Para isso, dados dos processos são analisados e modelados matematicamente utilizando a lógica fuzzy, produzindo um resultado que direciona corretamente os profissionais no momento da tomada de decisão, sobrepondo a manutenção preventiva existente pela manutenção preditiva, baseada em dados do processo. Foi criado um sistema computacional que favorece este processo de forma automática e simplificada, evitando burocracias legais quanto à questão de licenciamento de softwares do mercado, de forma a realizar os cálculos, além de facilitar a incorporação de dados e análises de forma intuitiva, não necessitando de maiores treinamentos para tanto. Por fim, durante o estudo da lógica fuzzy e pesquisas relacionadas, foi detectada a possibilidade de aplicação prática para estudantes do Ensino Médio. Dessa forma, uma aula expositiva com atividades originais foi realizada para apresentar os conjuntos e a lógica fuzzy, mostrando a capacidade dos alunos do Ensino Médio em assimilar os conteúdos já citados. / In this work, we present an introductory study to Fuzzy Set Theory and Fuzzy Logic, showing its potential application through the analysis of a problem in a chemical industry and the introduction of some concepts of this theory to high school students. As for the problem of the chemical industry, the objective is to advise a manufacturing management team of a certain chemical industry in the decision making for an opportune time for an intervention in an industrial pump. This team observed as a difficulty in its cost management a preventive maintenance of a certain pump of its process. For this, the data of the processes are analysed and modelled mathematically using a fuzzy logic, producing a result that correctly directs the professionals at the moment of the decision making, overlapping the existing preventive maintenance, by the base predictive maintenance in process data. It was created a computer system that helps this process in an automatic and simplified way, avoiding legal bureaucracies regarding the licensing of software in the market, in order to perform the calculations, besides facilitating the incorporation of data and analyses in an intuitive way, not requiring of greater training for both. Finally, during the study of fuzzy logic and related research, it was detected as a possibility of practical application for high school students. Thus, an expository class with original activities was performed to present the sets and a fuzzy logic, showing the ability of the high school students to assimilate the referred contents.
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[en] HIERARCHICAL NEURO-FUZZY BSP-MAMDANI MODEL / [pt] MODELO NEURO-FUZZY HIERÁRQUICOS BSP MAMDANIROSINI ANTONIO MONTEIRO BEZERRA 04 November 2002 (has links)
[pt] Esta dissertação investiga a utilização de sistemas Neuro-
Fuzzy Hierárquicos BSP (Binary Space Partitioning) para
aplicações em classificação de padrões, previsão, sistemas
de controle e extração de regras fuzzy. O objetivo é criar
um modelo Neuro-Fuzzy Hierárquico BSP do tipo Mamdani a
partir do modelo Neuro-Fuzzy Hierárquico BSP Class
(NFHB-Class) que é capaz de criar a sua própria estrutura
automaticamente e extrair conhecimento de uma base de dados
através de regras fuzzy, lingüisticamente interpretáveis,
que explicam a estrutura dos dados. Esta dissertação
consiste de quatros etapas principais: estudo dos principais
sistemas hierárquicos; análise do sistema Neuro-Fuzzy
Hierárquico BSP Class, definição e implementação do modelo
NFHB-Mamdani e estudo de casos. No estudo dos principais
sistemas hierárquicos é efetuado um levantamento
bibliográfico na área. São investigados, também, os
principais modelos neuro-fuzzy utilizados em sistemas de
controle - Falcon e o Nefcon. Na análise do sistema NFHB-
Class, é verificado o aprendizado da estrutura, o
particionamento recursivo, a possibilidade de se ter um
maior número de entrada - em comparação com outros sistemas
neuro-fuzzy - e regras fuzzy recursivas. O sistema NFHB-
Class é um modelo desenvolvido especificamente para
classificação de padrões, como possui várias saídas, não é
possível utilizá-lo em aplicações em controle e em
previsão. Para suprir esta deficiência, é criado um novo
modelo que contém uma única saída. Na terceira etapa é
definido um novo modelo Neuro-Fuzzy Hierárquico BSP com
conseqüentes fuzzy (NFHB-Mamdani), cuja implementação
utiliza a arquitetura do NFHBClass para a fase do
aprendizado, teste e validação, porém, com os conseqüentes
diferentes, modificando a estratégia de definição dos
conseqüentes das regras. Além de sua utilização em
classificação de padrões, previsão e controle, o sistema
NFHB-Mamdani é capaz de extrair conhecimento de uma base de
dados em forma de regras do tipo SE ENTÃO. No estudo de
casos são utilizadas duas bases de dados típicas para
aplicações em classificação: Wine e o Iris. Para previsão
são utilizadas séries de cargas elétricas de seis
companhias brasileiras diferentes: Copel, Cemig, Light,
Cerj, Eletropaulo e Furnas. Finalmente, para testar o
desempenho do sistema em controle faz-se uso de uma planta
de terceira ordem como processo a controlar. Os resultados
obtidos para classificação, na maioria dos casos, são
superiores aos melhores resultados encontrados pelos outros
modelos e algoritmos aos quais foram comparados. Para
previsão de cargas elétricas, os resultados obtidos estão
sempre entre os melhores resultados fornecidos por outros
modelos aos quais formam comparados. Quanto à aplicação em
controle, o modelo NFHB-Mamdani consegue controlar, de forma
satisfatória, o processo utilizado para teste. / [en] This paper investigates the use of Binary Space
Partitioning (BSP) Hierarchical Neuro-Fuzzy Systems for
applications in pattern classification, forecast, control
systems and obtaining of fuzzy rules. The goal is to create
a BSP Hierarchical Neuro-Fuzzy Model of the Mamdani type
from the BSP Hierarchical Neuro-Fuzzy Class (NFHB-Class)
which is able to create its own structure automatically and
obtain knowledge from a data base through fuzzy rule,
interpreted linguistically, that explain the data structure.
This paper is made up of four main parts: study of the main
Hierarchical Systems; analysis of the BSP Hierarchical
Neuro-Fuzzy Class System, definition and implementation of
the NFHB-Mamdani model, and case studies. A bibliographical
survey is made in the study of the main Hierarchical
Systems. The main Neuro-Fuzzy Models used in control
systems - Falcon and Nefcon -are also investigated.
In the NFHB-Class System, the learning of the structure is
verified, as well as, the recursive partitioning, the
possibility of having a greater number of inputs in
comparison to other Neuro-Fuzzy systems and recursive fuzzy
rules. The NFHB-Class System is a model developed
specifically for pattern classification, since it has
various outputs, it is not possible to use it in control
application and forecast. To make up for this deficiency, a
new unique output model is developed. In the third part, a
new BSP Hierarchical Neuro-Fuzzy model is defined with
fuzzy consequents (NFHB-Mamdani), whose implementation uses
the NFHB-Class architecture for the learning, test, and
validation phase, yet with the different consequents,
modifying the definition strategy of the consequents of the
rules. Aside from its use in pattern classification,
forecast, and control, the NFHB-Mamdani system is capable of
obtaining knowledge from a data base in the form of rules
of the type IF THEN. Two typical data base for application
in classification are used in the case studies: Wine and
Iris. Electric charge series of six different Brazilian
companies are used for forecasting: Copel, Cemig, Light,
Cerj, Eletropaulo and Furnas. Finally, to test the
performance of the system in control, a third order plant
is used as a process to be controlled. The obtained results
for classification, in most cases, are better than the best
results found by other models and algorithms to which they
were compared. For forecast of electric charges, the
obtained results are always among the best supplied by
other models to which they were compared. Concerning its
application in control, the NFHB-Mamdani model is able to
control, reasonably, the process used for test.
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Neurofuzzy modelling approaches in system identificationBossley, Kevin Martin January 1997 (has links)
System identification is the task of constructing representative models of processes and has become an invaluable tool in many different areas of science and engineering. Due to the inherent complexity of many real world systems the application of traditional techniques is limited. In such instances more sophisticated (so called intelligent) modelling approaches are required. Neurofuzzy modelling is one such technique, which by integrating the attributes of fuzzy systems and neural networks is ideally suited to system identification. This attractive paradigm combines the well established learning techniques of a particular form of neural network i.e. generalised linear models with the transparent knowledge representation of fuzzy systems, thus producing models which possess the ability to learn from real world observations and whose behaviour can be described naturally as a series of linguistic humanly understandable rules. Unfortunately, the application of these systems is limited to low dimensional problems for which good quality expert knowledge and data are available. The work described in this thesis addresses this fundamental problem with neurofuzzy modelling, as a result algorithms which are less sensitive to the quality of the a priori knowledge and empirical data are developed. The true modelling capabilities of any strategy is heavily reliant on the model's structure, and hence an important (arguably the most important) task is structure identification. Also, due to the curse of dimensionality, in high dimensional problems the size of conventional neurofuzzy models gets prohibitively large. These issues are tackled by the development of automatic neurofuzzy model identification algorithms, which exploit the available expert knowledge and empirical data. To alleviate problems associated with the curse of dimensionality, aid model generalisation and enhance model transparency, parsimonious models are identified. This is achieved by the application of additive and multiplicative neurofuzzy models which exploit structural redundancies found in conventional systems. The developed construction algorithms successfully identify parsimonious models, but as a result of noisy and poorly distributed empirical data, these models can still generalise inadequately. This problem is addressed by the application of Bayesian inferencing techniques; a form of regularisation. Smooth model outputs are assumed and superfluous model parameters are controlled, sufficiently aiding model generalisation and transparency, and data interpolation and extrapolation. By exploiting the structural decomposition of the identified neurofuzzy models, an efficient local method of regularisation is developed. All the methods introduced in this thesis are illustrated on many different examples, including simulated time series, complex functional equations, and multi-dimensional dynamical systems. For many of these problems conventional neurofuzzy modelling is unsuitable, and the developed techniques have extended the range of problems to which neurofuzzy modelling can successfully be applied.
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The control of a multi-variable industrial process, by means of intelligent technologyNaidoo, Puramanathan January 2001 (has links)
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 efficiency, simplified process, etc. Within this project, conventional PID control has already been implemented, with the control parameter adjustment and loop tuning being problematic. This is mainly due to a number of external parameters that affects the stability of the process. In maintaining a consistent temperature, for example, the steam flow rate varies, the hot well temperature varies, the ambient may temperature vary. Another contributing factor, the time delay, also affects the optimization of the system, due to the fact that temperature measurement is based on principle of absorption. The normal practice in industry to avoid an unstable control condition is to have an experienced operator to switch the controller to manual, and make adjustments. After obtaining the desired PV, the controller is switched back to automatic. This research project focuses on eliminating this time loss, by implementing a knowledge-based controller, for intelligent decision-making. A FLC design tool, which allows full interaction, whilst designing the control algorithm, was used to optimize the control system. The design tool executed on a PC is connected to a PLC, which in turn is successfully integrated into the process plant.
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