Thesis (M.Sc.)--York University, 2006. Graduate Programme in Computer Science. / Typescript. Includes bibliographical references (leaves 128-137). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR29550

Thesis (doctoral)--Technische Universiteit Delft, 1997. / Vita. Includes bibliographical references (p. 267-282) and index.

Este trabalho apresenta uma abordagem paralela em FPGA para implementação de controladores digitais, com a finalidade de reduzir o tempo computacional de execução das leis de controle. A técnica de controle utilizada na implementação proposta pode ser aplicada para a compensação seletiva de harmônicos em filtros ativos de potência (FAP). Para compensar mesmo um número reduzido de harmônicas são necessárias múltiplas instruções de cálculo, envolvendo multiplicações e adições. Desta forma, para melhorar o desempenho computacional do sistema, é proposta uma estrutura paralela para implementação do controlador. Para compensação de um número maior de harmônicas é realizada a decomposição das tensões em suas componentes harmônicas em eixos síncronos utilizando a Transformada Discreta de Fourier. Esta estratégia permite um tempo de cálculo fixo independente do número de harmônicas, até o limite imposto pela frequência de amostragem. Os resultados experimentais são apresentados para comparar o tempo de execução da abordagem paralela proposta com o tempo de execução sequencial convencionalmente utilizado na literatura. / This paper presents a parallel approach to FPGA implementation of digital controllers, in order to reduce the computational time for implementing the control laws. The control technique used in the proposed implementation can be applied for selective harmonic compensation in active power filters (APF). To compensate for even a small number of harmonics requires multiple calculation instructions involving multiplications and additions. Thus, to improve the performance of the computer system is proposed to implement a parallel structure of the controller. To compensate for a larger number of harmonics is performed in the decomposition voltages of the harmonic components into their frames synchronous using the Discrete Fourier Transform. This strategy allows a calculation time fixed regardless of the number of harmonics up to the limit imposed by the sampling frequency. The experimental results are presented to compare the runtime of the proposed parallel approach with the sequential execution time conventionally used in the literature.

Thesis (MTech (Electrical Engineering))--Peninsula Technikon, 2002 / This research outlines the development and design of an infrared radiation heating profile controller. The study includes both the theoretical aspects of the design process as well as giving an overview of the practical facets involved. The controller was subjected to comparative testing with a proportional control model, in order to observe its performance and validate its effectiveness. A need exists for these types of controllers and proved to be the motivation to embark on this investigation. Controllers of this nature that are commercially available either lacks the functionality of this unit or are too expensive to implement for research purposes. This unit was designed with cost effectiveness in mind but still meet the standards required of an industrial style controller. To this end the construction was completed using low cost and affordable electronic components. Heating profiles are necessary and useful tools for the proper processing of a host of materials. The controller developed in this research is able to within a fair degree of accuracy track a heating profile. The results confirm that this programmable control model to be a benefit and a valuable tool in temperature regulation. This means that intensive studies into the effects of infrared radiation on materials are now feasible. Research of this nature could possibly expand the application of infrared as a heating mechanism. Although tests were conducted on this controller, they are not meant to serve as an exhaustive analysis. The conclusions of these examinations do reveal the benefit of such a controller. More rigorous investigation is suggested as a subject for further study.

Orientador: Edevar Luvizotto Júnior / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo / Made available in DSpace on 2018-08-22T20:58:38Z (GMT). No. of bitstreams: 1 Ghidetti_AriltonJose_M.pdf: 3270647 bytes, checksum: d5b718b43ee9a69efab843d850099b49 (MD5) Previous issue date: 2013 / Resumo: Este trabalho apresenta uma avaliação do emprego do Método das Vazões Mínimas Noturnas quando aplicado a um Setor de Abastecimento utilizando bombeamento direto com variação de rotação. O método de simples concepção é empregado na obtenção das informações para a elaboração de um diagnóstico de perdas de água em sistemas de abastecimento. No caso apresentado nesse trabalho o método foi aperfeiçoado possibilitando sua aplicação prática à realidade do setor investigado. Os resultados obtidos permitiram concluir que o método, após o aperfeiçoamento proposto é adequado se utilizarmos como diretriz a comparação e verificação dos resultados obtidos durante a pesquisa com o valor de perdas totais obtidos via balanço hídrico de todo o Município de Itapetininga, podendo inclusive ser utilizado em outros setores que empregam bombeamento com rotação variável, uma tendência observável nos grandes sistemas de abastecimento e, certamente para os quais o método da vazão mínima noturna pode proporcionar um efetivo suporte nas investigações de perdas / Abstract: This paper presents a review of the use of Method of Minimum Flows Night when applied to a Sector Supply using direct pumping with variable speed. The simple design method is employed to obtain the information for making a diagnosis of loss of water supply systems. In the case presented in this work the method was perfected allowing its practical application to the reality of the sector investigated. The results showed that the method after the improvement proposed is appropriate if we use as a guideline the comparison and verification of results obtained during the survey of the value of total losses obtained via water balance of the entire city of Itapetininga, and may even be used in other industries that employ variable speed pumping, a trend observable in large supply system sand certainly for which the minimum night flow method can provide an effective support in investigations of losses / Mestrado / Saneamento e Ambiente / Mestre em Engenharia Civil

Prof. A.L. Nel

Dos nos jours, l'évolution croissante des domaines d'application des circuits intégrés impose aux industriels de nouvelles contraintes de conception. Afin de réaliser des circuits électroniques plus denses et plus performants, ils cherchent à faire cohabiter plusieurs types de composants sur des surfaces plus petites et de surcroît, fonctionnant à des fréquences de plus en plus élevées. Cependant, cette cohabitation pourrait générer des problèmes de CEM (compatibilité électromagnétique). Les travaux présentés dans ce mémoire rentrent dans le cadre du projet de recherche SEISME (Simulation de l'Emission et de l'Immunité des Systèmes et Modules Electroniques). Ils décrivent des méthodologies de mesure et de modélisation de’immunité conduite des circuits intégrés complexes comme les mémoires non volatiles ou bien les microcontrôleurs. L'objectif est d'étudier l'influence des changements de composants et de cartes sur le comportement électromagnétique d'un système électronique. Dans cette perspective, afin de valider son utilisation dans le cas des circuits intégrés complexes, une étude détaillée du standard de mesure DPI (Direct Power injection) est d'abord proposée. Basé sur cette dernière, un nouveau prototype de chemin de couplage est réalisé. Ce multiplexeur permet de superposer un signal agresseur à un signal fonctionnel, avec un chevauchement de leurs bandes de fréquences. Ainsi, il est possible d'agresser une broche fonctionnelle (horloge par exemple) d'un circuit intégré pendant son fonctionnement. Ensuite, une procédure de mesure globale d'immunité conduite est présentée. Elle permet de caractériser la susceptibilité conduite des circuits complexes en tenant compte des différents modes de fonctionnement et avec la possibilité d’utiliser un critère d’immunité fonctionnel ou électrique. Grâce à l'application de cette procédure à deux mémoires non volatiles compatibles broche à broche (mêmes caractéristiques mais de deux différents fournisseurs), il est possible de constater l’influence des technologies de fabrication sur l’immunité conduite de ce type de circuits. Par conséquent, l’effet du changement de composant sur le comportement électromagnétique d’un système électronique devient prédictible. Enfin pour la modélisation, deux méthodologies sont proposées. Une au niveau composant et l'autre au niveau carte. La démarche de modélisation au niveau composant repose sur le standard ICIM-CI (Integrated Circuit Immunity Model-Conducted Immunity) et vise à générer un modèle d’immunité simulable et prédictif. Grâce à l'application de cette démarche dans le contexte des mémoires non volatiles, il est possible de prédire leur immunité dans le cas de modification de l’impédance d'entrée par rajout d'éléments de filtrage par exemple. En ce qui concerne la modélisation au niveau carte, une procédure basée sur la proposition de modèle EBIM-CI (Electronic Board Immunity Model-Conducted Immunity) est développée. Elle consiste à générer un modèle d’immunité d’une carte électronique en utilisant les modèles des différents composants qui la constituent. Un cas d’étude a été défini. Le modèle issu de cette approche permet de simuler l’immunité conduite globale du démonstrateur ainsi que de prédire le comportement électromagnétique de ce dernier lors du changement d’un ou plusieurs composants. / Nowadays, the growing evolution of application fields for integrated circuits sets new constraints for designers and manufacturers. Due to continuous technological advances in integrated circuits, those have become smaller, denser and operational at higher frequencies. The miniaturization of integrated circuits has led to the reduction of power consumption and, thus, noise margins. Mixing digital and analog functions inside the same chip also makes electromagnetic interferences (EMis) more likely to spread and cause disturbances. As a result, complex ICs with coexisting different functions represent a challenge from an EMC point of view, as interferences can cause critical functional failures. The work presented in this manuscript falls within the SEISME project which aims, among others, to perform the simulation of both the emission and the immunity of electronic systems and modules at different levels (JC, PCB, equipment, system). More precisely, this work deals with the development of measurement and modeling methodologies for the characterization of the conducted immunity of complex ICs, such as microcontrollers and non-volatile memories. The main goal is to study the effect of component and/or board replacement on the electromagnetic behavior of a complete electronic system. In this context, a thorough study of the Direct Power Injection (DPI) technique is presented, thus validating its use for complex integrated circuits. Based on this study, a new prototype for the disturbance coupling path is proposed. It consists of a multiplexer that enables the superposition of a disturbance signal and a functional one with overlapping frequency bands. Therefore, it is possible to disturb an IC functional pin (a clock for instance) during its operation. Moreover, measurement procedure for conducted immunity is introduced. Its advantage is to make it possible to characterize the immunity of complex ICs by taking into account different operation modes as well as flexible immunity criteria (electrical / functional). Thanks to the application of this methodology for two different, non-volatile, pin-to-pin-compatible memories (having the same characteristics but different manufacturers), the influence of fabrication technology on the conducted immunity of such ICs is better identified and understood. As a consequence, the effect of changing components on the electromagnetic behavior of an electronic system has become predictable. As far as modeling aspects are concerned, two methodologies are presented in this manuscript. The first one deals with the immunity at the component level whereas the other involves board level immunity. At the IC level, the modeling approach is rather based on the ICIM-CI (lntegrated Circuit Immunity Model-Conducted Immunity) draft standard which makes it possible to extract simulation models that can be incorporated within IC design flows. Once applied to the context of non-volatile memories, this approach allows predicting their immunity in the case of modified input impedance, for example. As far as immunity modeling at the board level is concerned, the idea is to make use of ICIM-CI models corresponding to different ICs on the PCB in order to construct an Electronic Board Immunity Model for Conducted Immunity (EBIM-CI). A case study has been defined and the extracted model makes it possible to simulate the demonstrator's global conducted immunity as well as to predict its electromagnetic behavior following the replacement of one or more components.

This diploma thesis deals with developing of software, which allows access and control of programmable controllers through web interface. Software uses client server model and for communication between client and server is used Windows Communication Foundation interface which is integrated in Microsoft .NET Framework from version 3.0. Applications were written in C# programming language using .NET Framework libraries. Data visualization in web application was created by Microsoft Silverlight.

No description available.

In this thesis an evaluation was performed of different approaches for interaction between algorithmic processing, and ladder logic and memory locations in a programmable controller. The evaluation provides a potential customer with information to make a decision for selection of the equipment used in this work. The specific capabilities of two approaches to programmable controller interfacing, a) via an intelligent I/O module and b) via a host computer on a network have been detailed. The attributes for comparison of the above two approaches were, a) capability of accessing information from memory locations in the programmable controller, b) capability of processing information in parallel to the programmable controller and c) memory considerations associated with each approach. The evaluation was performed on a Tl530 programmable controller. The intelligent I/O module used was the Texas Instruments programmable BASIC module. An IBM-PC was used as a host to the TIWAY I network. The Tl530 programmable controller was configured as a secondary on the network. The BASIC module was placed on the I/O rack of the programmable controller. The limitations and assumptions made for the purpose of evaluation, and scope for further work are presented. In addition, economic considerations and additional capabilities of both the approaches are presented. / M.S.