Thesis (MTech (Electrical Engineering))--Peninsula Technikon, 2002 / In this thesis fuzzy control is analyzed and applied to two complex processes. A process is deemed to be complex if it possesses characteristics that make it non-linear. Examples of such characteristics are backlash, hysteresis, saturation and dead zones, which are common in industrial processes. These characteristics do not allow for the easy implementation of controllers and often there would be a requirement to employ some non-linear form of control. Often with complex processes linearization techniques would be employed to enable the application of linear controllers. However, these controllers will only operate over a limited range and will have degradation in performance when subjected to unpredictable changes in parameters. Fuzzy controllers can handle nonlinear characteristics in complex processes very well and also provides some transparency between the human machine interface. Fuzzy control is based upon the fuzzy methodology that was introduced by Lotfi Zadeh (Zadeh, 1965) in his seminal paper on fuzzy sets. The first practical application (Mamdani and Assilian, 1975) paved the way for fuzzy control and although this alternate paradigm of control came up against much criticism it managed to capture the interest of many researchers. Although research into fuzzy control saw a slump in the late 70's and early 80's it rapidly progressed in the 90's with literally thousands of research papers being published. In this study this alternate paradigm of control is investigated and applied to two processes. An initial study was done on the fundamental concepts of fuzzy logic and how this methodology can be applied to develop a controller that is fuzzy logic based. A plethora of information exist on fuzzy theory however only the fundamental concepts are dealt with here. This is sufficient for the realization of a rudimentary controller. A detailed investigation was also done on the development of the rules of the knowledge base of the controller with the emphasis on the development of a fuzzy controller that has characteristics akin to a proportional-integral (PI) controller.

Orientador: Marcelo Esteban Coniglio / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Filosofia e Ciências Humanas / Made available in DSpace on 2018-08-25T12:43:36Z (GMT). No. of bitstreams: 1 Peron_NewtonMarques_D.pdf: 1773917 bytes, checksum: da2d2a1b1ecf8da6e26e419dee4888c5 (MD5) Previous issue date: 2014 / Resumo: Esse é um estudo sobre a viabilidade de matrizes finitas como semântica para lógica modal. Separamos nossa análise em dois casos: matrizes determinísticas e não-determinísticas. No primeiro caso, generalizamos o Teorema de Incompletude de Dugundji, garantindo que uma vasta família de lógicas modais não pode ser caracterizada por matrizes determinísticas finitas. No segundo caso, ampliamos a semântica de matrizes não- determinísticas para lógica modal proposta independentemente por Kearns e Ivlev. Essa ampliação engloba sistemas modais que, de acordo com nossa generalização, não podem ser caracterizados por matrizes determinísticas finitas / Abstract: This is a study on the feasibility of finite matrices as semantics for modal logics. We separate our analysis into two cases: deterministic and non-deterministic matrices. In the first case, we generalize Dugundji's Incompleteness Theorem, ensuring that a wide family of modal logic cannot be characterized by deterministic finite matrices. In the second, we extend the non-deterministic matrices semantics to modal logics proposed independently by Kearns and Ivlev. This extension embraces modal systems that, according to our generalization, cannot be characterized by finite deterministic matrices / Doutorado / Filosofia / Doutor em Filosofia

Matematik är ett ämne som elever över hela världen behöver lära sig. I de senare årskurserna bygger ämnet på att elever ska kunna behärska algebra. Vi har valt att fokusera på mönster vilket många anser vara inkörsporten till algebra. För att lärare ska kunna erbjuda elever en rättvis utbildning bör de ha kunskap om elevers svårigheter och lärande. Vår litteraturstudie har riktat in sig på att försöka svara på vad forskning säger om elevers lärande till växande geometriska mönster och explicit formel. I de elva studier som valts ut har vi kommit fram till att några gemensamma slutsatser finns men även sådana som skiljer sig åt. Att elever behöver utveckla sitt språk och få förståelse för innebörden av bokstavssymboler i matematiken är en viktig slutsats för lärande relaterad till mönster. Studierna har dessutom visat en stark relevans i att samordna olika delar till en helhet. Svenska elevers resultat i internationella undersökningar problematiseras och vad som kan tänkas vara orsaken till att de presterar sämre i mönsterrelaterade uppgifter än vad de gör i övriga delar i matematiken. Vårt resultat är till stor del överensstämmande med hur de svenska styrdokumenten förhåller sig till ämnet. Trots det har svenska elever svårigheter med att uttrycka en explicit formel till ett växande geometriskt mönster. Just den explicita formeln är viktig för elevers helhetsförståelse av mönster och tidig algebra.

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The present thesis considers the relation between Jacques Derrida and G.W.F. Hegel. In his Positions Derrida noted that differance is ‘at a point of almost absolute proximity to Hegel,’ and that he had ‘attempted to distinguish [differance] from Hegelian difference at the point at which Hegel, in the greater Logic, determines difference as contradiction only in order to resolve it.’ Nevertheless, scholarship on the relation between the two thinkers has largely neglected the detailed consideration of the relation of Derrida’s thinking to Hegel’s logic of essence, where the categories of difference and contradiction are located. This has often led to a simplification, from both Hegelian and Derridean perspectives, of the relation between Hegel and Derrida. Through a reading of Hegel’s logic of essence and of Derrida’s early texts in particular, the thesis first aims to determine the nature and degree of the proximity indicated by Derrida and then considers the manner in which the two thinkers depart from one another. The proximity between Hegel and Derrida is drawn out through an analysis of Hegel’s notion of reflection and his logic of identity and difference. This logic is compared with the ‘graphics’ of identity and difference elaborated by Derrida in his Limited Inc. I claim that Derrida departs from Hegel in thinking difference as the displacement of opposition. Nevertheless, I claim that in relating Hegel and Derrida to one another, it cannot be a question of simply comparing two logics or two philosophies, for Derrida does not and cannot have a general logic or ‘philosophy’ of ‘differance.’ Derrida thus departs from Hegel also insofar as he puts into question the possibility of, and the desire for, a general onto-logic.

M.Ed. / Please refer to full text to view abstract

M.Sc.

M.Sc. / Please refer to full text to view abstract