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Paulo Licio De Geus - One of the best experts on this subject based on the ideXlab platform.
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Arquitetura de um microcomputador para controle de processos concorrentes em tempo real
2014Co-Authors: Paulo Licio De GeusAbstract:Resumo: Este trabalho descreve. Modificações introduzidas sobre a arquitetura existente de um microcomputador modular para atender requisitos de novas aplicações propostas. Tais aplicações envolvem aquisição de dados e processamento em tempo rea1 , além do gerenciamento de um grande número de interfaces de comunicação série. O objetivo procurado foi a obtenção de um sistema com baixo tempo de resposta a eventos assíncronos, otimização do fluxo de dados e boa taxa de processamento, dentro das limitações de gerenciamento de memória implícitas à CPU"de 8 bits utilizada. As principais modificações de hardware introduzidas são: uma unidade de gerenciamento de memória. com página.s de 4 Kbytes é 64 contextos de paginação residentes; um esquema de interrupções vetorizadas (família Z80) para a identificação automática de até 128 eventos diferentes; um controlador de DMA dispondo de 11 canais independentes com acesso ao espaço total de 1 Mbyte do microcomputadorAbstract: This work describes enhancements made over the existing architecture of a modular Microcomputer to support the requirements of proposed new applications. Such applications involve data aquisition and real-time processing, as well as the management of several serial communication interfaces. The desired goal was to get a system with low response time to asynchronous events, optimized data flow and good throughput, within the memory management limitations implied by the use of an 8 bit CPU. The main hardware alterations are: a memory-management unit with 4K byte pages and 54 resident pagination contexts; a vectorized interrupt scheme (Z80 family) for automatic identification of up to 128 different events; a DMA controller supporting 11 independent channels, with access to the full 1 Mbyte space of the microcompute
Bimal K. Bose - One of the best experts on this subject based on the ideXlab platform.
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recent advances in power electronics
IEEE Transactions on Power Electronics, 1992Co-Authors: Bimal K. BoseAbstract:Recent advances in several key areas of power electronics technology, such as power semiconductor devices, power converter circuits, and control of power electronics, are discussed. The structure and characteristics of IGBT, SIT, SITH, and MCT devices are reviewed. The principal converter types and their recent trends are described. A brief review of power integrated circuits is included. The features of Microcomputer and VLSI control are described, and recent advances in Microcomputers are highlighted. The principles of expert systems, fuzzy control, and neural networks are presented. >
Fabbri, Sandra Camargo Pinto Ferraz - One of the best experts on this subject based on the ideXlab platform.
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AN EXPERIMENT IN THE APPLICATION OF MicrocomputerS TO SMALL FIRMS
Instituto de Ciências Matemáticas e de Computação, 2019Co-Authors: Fabbri, Sandra Camargo Pinto FerrazAbstract:Um escritório de corretagem de seguros foi objeto de uma experiência destinada a apoiar por computador suas atividades. A Análise Estruturada foi aplicada na especificação do sistema manual existente. Foram desenhados diagramas de fluxo de da dos conjugados com um dicionário de dados manual, As necessidades do usuário foram identificadas como relativas principalmente ao controle dos vencimentos de pagamentos e das datas de expiração de seguros bem como à recuperação de informações sobre os clientes e capitais segurados. As técnicas de projeto estruturado foram aplicadas em conjunto com programação estruturada para desenvolver uma implementação em dGaseII de um sistema para satisfazer essas necessidades. Um microcomputador tipo Apple com duas unidades de disco flexível e uma impressora foi usado na experiência. Os resultados indicam que a aplicação definitivamente não foi efetiva em termos de custo, principalmente devido ao tempo se recursos financeiros consumidos. Maneiras alternativas para resolver problemas de processamento de dados de micro empresas com microcomputadores são examinadas no trabalho. Quarenta e duas referências bibliográficas são discutidas nesse contexto. A experiência leva à conclusão de que para que microcomputadores possam ser aplicados efetivamente em termos de custo a micro empresas é necessário que esforços de pesquisas sejam concentrados em tornar mais expedito o esforço de análise.A small insurance brokerage firm has been the object of an experiment aiming to computer aid its activities. Structured analysis has been applied in the specification of the existing manual system. Data flow diagrams have been drafted together with a manual data dictionary. User requirements have been identified as refering mainly to payments due and insurance expiration date control as well as customer information and policy amount retrieval. Structured design techniques: have been applied to gether with structured programming to develop an\" implementation in dBaseIl of a system to satisfy these requirements. An Apple like Microcomputer with two floppy disk drives and a printer has been used in the experiment. Results indicate that this application has definitely not been cost effective mainly due to analysis time and cost consumption. Alternative ways for solving small: firms data processing problems with Microcomputers are examined in the paper. Forthy-two bibliographic references are discussed in this context. The experiment leads to the conclusion that research efforts should concentrate in expeding the analysis ef fort if Microcomputers are to be cost effectivelly applied to small firms
Gao Huaijun - One of the best experts on this subject based on the ideXlab platform.
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trash can with sampling circuit
2014Co-Authors: Gao HuaijunAbstract:The utility model discloses a trash can with a sampling circuit. The trash can comprises a barrel body, a barrel cover, a solar cell panel, a single-chip Microcomputer, a wireless router and an antenna. The barrel cover is arranged on the barrel body, the solar cell panel and the antenna are installed on the barrel cover, the single-chip Microcomputer and the wireless router are arranged in the barrel cover, the solar cell panel and the wireless router are electrically connected with the single-chip Microcomputer, the wireless router is electrically connected with the antenna, a barrel cover lower surface is located above the barrel body, infrared sensors are arranged on the outer side of the barrel body and connected with the single-chip Microcomputer sequentially through the sampling circuit and a filter circuit, and the sampling circuit comprises an operational amplifier A1, a diode D1, a slide rheostat R4, a capacitor C1, a capacitor C2 and a capacitor C3. The goal of conveniently searching the public trash can is achieved.
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spittoon trash can with filtering circuit
2014Co-Authors: Gao HuaijunAbstract:The utility model discloses a spittoon trash can with a filter circuit. The spittoon trash can comprises a phlegm pocket, a box body, a box cover, a solar cell panel and a single-chip Microcomputer. The bottom of the phlegm pocket is connected to the bottom of a side wall of the box body through a shaft, the shaft is provided with a stepping motor, a side wall of the phlegm pocket is fixed on the side wall of the box body, an end wall of the phlegm pocket is in an arc shape, the arc length of the end wall of the phlegm pocket is larger than the length of the side wall of the box body, the solar cell panel is electrically connected with the single-chip Microcomputer, the output end of the single-chip Microcomputer is connected with the stepping motor, the side wall of the box body is provided with a proximity switch, an infrared sensor is arranged at the position of an opening of the phlegm pocket, and the proximity switch and the infrared sensor are connected to the input end of the single-chip Microcomputer. An amplifying circuit, a sampling circuit and a filter circuit are sequentially in series connection between the proximity switch and the single-chip Microcomputer, and the filter circuit comprises an operational amplifier A1, a capacitor C1, a capacitor C2 and a capacitor C3. The goal of conveniently storing phlegm and protecting the environment is achieved.
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spittoon trash can with amplifying circuit
2014Co-Authors: Gao HuaijunAbstract:The invention discloses a spittoon trash can with an amplifying circuit. The spittoon trash can comprises a sputum bag, a box body, a box cover, a solar cell panel and a single chip Microcomputer. The bottom of the sputum bag is connected to the bottom of the side wall of the box body through a shaft. A stepping motor is arranged on the shaft. The side wall of the sputum bag is fixed on the side wall of the box body. The side wall of the sputum bag is made of flexible materials. The end wall of the sputum bag is arc-shaped. The arc length of the end wall of the sputum bag is larger than the length of the side wall of the box body. The solar panel is electrically connected with the single chip Microcomputer. The output end of the single chip Microcomputer is connected with a stepping motor. The single chip Microcomputer is arranged in the box cover. An approach switch is arranged on the side wall of the box body. An infrared sensor is arranged in the opening of the sputum bag. The approach switch and the infrared sensor are both connected to the input end of the single chip Microcomputer. The amplifying circuit, a sampling circuit and a filter circuit are sequentially arranged between the approach switch and the single chip Microcomputer. The amplifying circuit comprises an operational amplifier A1and an audion T1. The spittoon trash can realizes the purposes of storing sputum conveniently and protecting the environment.
Roland N Auer - One of the best experts on this subject based on the ideXlab platform.
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automated nerve fibre size and myelin sheath measurement using Microcomputer based digital image analysis theory method and results
Journal of Neuroscience Methods, 1994Co-Authors: Roland N AuerAbstract:Abstract In either clinical or research settings, manual measurement and counting of myelinated fibres in peripheral nerve is tedious and error-prone, yet fully automatic computerized counting and measuring of fibres fails to count small fibres and eliminate extraneous profiles in the tissue. This article describes an operator-interactive, semiautomated method for quantification of myelinated nerve fibre data using commercially available hardware and software on an inexpensive, yet full-featured image analysis system based on a Microcomputer. Software macros automate the acquisition of data from the microscope images and the production of numerical and graphic data, with output to either paper hardcopy or 35 mm colour slides. User control is retained for dynamic thresholding, binary image creation and elimination of artifacts. In addition to generating the classic histogram showing the size distribution of nerve fibres, the thickness and variability of myelin sheaths are also graphically depicted. The method is based on measurement of myelin area and total perimeter, with calculation of equivalent circles and diameters for both axon and nerve fibre. Measured fibre sizes are thus somewhat larger than those resulting from manual methods using the minor diameter of an oval profile, or mean diameter of crenated or irregular profiles. The method allows the rapid measurement and counting of numbers of fibres previously impossible to assess manually, or using digitizing tablets. By increasing the speed and accuracy of data acquisition and processing using widely available Microcomputers, the method may allow a better description of peripheral nerve changes in research and clinical settings.
