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Добірка наукової літератури з теми "Digital state controller"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Digital state controller"

Anisimov, A. A., and S. V. Tararykin. "Synthesizing robust control systems for mechatronic objects with digital state controllers and observers." Vestnik IGEU, no. 6 (December 28, 2020): 39–47. http://dx.doi.org/10.17588/2072-2672.2020.6.039-047.

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Currently, digital controllers with state observers are widely applied in automatic control systems for mechatronic objects, which great potential abilities are caused by structural flexibility and developed methods of synthesis. However, during design and practical implementation of the systems there is problem of robustness, associated with parametrical uncertainty of typical mechatronic objects. Most methods for synthesis of robust control systems are based on application of continuous mathematical models and do not take into account specific of digital realization of controllers with state observers. Methods of state space, modal control, digital system design, numerical optimization algorithms and simulation in MatLab environment were used. We propose a method of synthesizing robust digital modal control systems with state observers based on generating dynamic system characteristics within the areas of parametric robustness. Further, low sensitivity of the system to changes in controlled object parameters is ensured by the minimal phase character of the complex controller transfer function, while low sensitivity to changing parameters of the controller itself is ensured by excluding positive feedback in both control and adjustment circuits. Developed recommendations of choosing dynamic characteristics of state controller with observer loops within robustness areas and of forming rational state observer structure allow us to synthesize digital automatic control system with low sensitivity for variation of both control object parameters and inherent controller parameters.

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Khaimuldin, A., T. Mukatayev, N. Assanova, and N. Khaimuldin. "DESIGNING DIGITAL CONTROLLERS FOR A CONTROLLED PLANT." Scientific Journal of Astana IT University, no. 4 (December 25, 2020): 24–33. http://dx.doi.org/10.37943/aitu.2020.56.15.003.

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This paper report contains an explanation of how to design a digital controller using the Laplace Transform to z-Transform conversion method. The objectives are that the controlled system should track step input with a reasonably small steady-state error and a settling time faster than the open-loop settling time. Furthermore, it should do so with the minimum overshoot that is reasonably possible. The main contribution is to establish the feasibility and ease of the systematic design procedure and future work will focus in more detail on applying the Sampling Theorem and deadbeat controller. There are several objectives that the controlled system should reach: 1. Track step input with a reasonably small steady-state error and a settling time which should be faster than the open-loop settling time. 2. Gain a small overshoot that is sufficiently possible. 3. Have a systematic design procedure. A method for finding the parameters of the deadbeat controller in the MatLab environment is presented. Based on the results obtained the simulation reveals that even when the control grows by one-step, the settling time of the system response could be less than that of the deadbeat controller. The work shows that deadbeat could be a powerful analysis tool since it is possible to grab the entire dynamic easily using several samples.

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Comer, David J. "Digital System Design: State Machine Versus Microprocessor Controller." IEEE Transactions on Education E-30, no. 2 (May 1987): 102–6. http://dx.doi.org/10.1109/te.1987.5570530.

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Wadhonakar, Kunal Anant. "Evaluation and Comparative Analysis of Speed Performance of Brushless DC Motor using Digital Controllers." International Journal for Research in Applied Science and Engineering Technology 9, no. 10 (October 31, 2021): 144–61. http://dx.doi.org/10.22214/ijraset.2021.38396.

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Abstract: This paper presents modeling, performance evaluation, and comparative analysis of speed performance of brushless DC motor (BLDCM) by using digital controllers. Speed performance analysis is carried out by using time response specifications which are useful for determining the effectiveness of the digital controllers. The wide spread of BLDCM in many areas due to the advantages of BLDCM over the conventional widely used motors such as induction motor and brushed DC motor. Advantages of BLDCM include higher efficiency, lower maintenance, longer life, reduced losses, single excitation, etc. Controllers are used to improve the transient and steady state speed response of the BLDCM. In many applications conventional PID controller is widely used to control the speed of the BLDCM but the main issue with the conventional PID controller is that it requires manual tuning of the parameters such as proportional, integral, and derivative gain constant. Even though the autotuning methods are available with the PID controller it is not adaptive itself to handle the conditions such as variations in parameters, disturbances in load, etc. In this Paper the Fuzzy-PID controller is used to control the speed of the BLDCM and Transient and steady state speed performance analysis is carried out using conventional PID controller and Fuzzy-PID to showcase the comparative analysis between two controllers. MATLAB/SIMULINK environment is used for modeling of the BLDCM and its drive/control system. Keywords: Brushless DC Motor (BLDCM), Fuzzy Logic Controller (FLC), Modeling of BLDC drive/control system, of PID controller, Transient and steady state analysis

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Mitchell, Elton E., and Robert Demoyer. "A Versatile Digital Controller Algorithm Incorporating a State Observer and State Feedback." IEEE Transactions on Industrial Electronics IE-32, no. 1 (February 1985): 78–84. http://dx.doi.org/10.1109/tie.1985.350145.

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Dorovskoy, Vladimir Alekseevich, Anton Aleksandrovich Zinchenko, Elena Gennad'evna Zinchenko, Pavel Andreevich Erofeev, and Dmitriy Aleksandrovich Mazin. "Optimizing digital controller of continuous object automatic control system." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 1 (February 28, 2022): 67–78. http://dx.doi.org/10.24143/2073-1574-2022-1-67-78.

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The article gives the analysis of optimizing the digital controller of the automatic control system (ACS) of a continuous object. The procedure for replacing a continuous controller with a discrete controller has been analyzed. The original continuous optimized ACS has been illustrated. It has been stated that the continuous ACS and its elements (all or particular) can be modeled by discrete models described by the difference equations, and not the differential ones, as is done in the case of continuous models. The specification of the sampling period of the PI controller model equal to 0.001 s has been given, the coefficients of the Z-transfer function of the digital PI controller, which is equivalent to a continuous controller, are considered. Of practical importance in the control theory is the representation of a discrete model of a controller, which helps obtain a digital transformation algorithm carried out by a controller over a control error, organize a discrete-digital control of a continuous object using a digital processor. The model with a continuous and discrete controller is illustrated. A formula for calculating the values of the lattice function of the output signal of a discrete controller is obtained. It has been found that sampling and quantization of the error signal, as well as restoring the control signal, should be carried out with the proper accuracy, which should provide the required control accuracy. There are considered the models of discrete-digital control with the correct selection of the parameters of discrete PI controllers, a model with a finite time of the transient process and a structure of its contour, given a fifth-order discrete function with a five-step transition to the steady state. It has been inferred that reducing the sampling period and quantization step significantly increases the processor speed requirements.

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Nhi Ho. T, To, Giao N. Pham, Quang Hung Nguyen, Binh A.Nguyen, Ngoc T. Le, and Hoanh Su Le. "Digital System Design for Traffic Light Controller System: A Systematic Approach." International Journal of Emerging Technology and Advanced Engineering 11, no. 11 (November 13, 2021): 169–75. http://dx.doi.org/10.46338/ijetae1121_19.

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In this paper, we are going to present the finite state machine, how to implement it via hardware description language (HDL), and how to use it in a real application. At first, the specification and requirements of traffic light controller are stated. Then, the system architecture based on finite state machine (FSM) are conducted. Finally, the way of using HDL as well as the test-bench simulation are given in detail. Keywords : Digital system design, System on chip, Finite State Machine, Digital Design Education, Smart Classroom.

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Veerendra, A. S., A. A. Shah, M. SubbaRao, and M. R. Mohamed. "Digital Fuzzy Current Controlled Light-Emitting Diode Driver with Power Factor Correction." International Journal of Photoenergy 2021 (March 15, 2021): 1–10. http://dx.doi.org/10.1155/2021/6618284.

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This paper presents the design and development of a fuzzy peak current controlled (FPCC) single-stage single-phase nonisolated AC/DC high-power factor LED drive. The proposed controller includes a fuzzy logic controller (FLC) in the loop voltage and a peak current controller in the loop current for an integrated nonisolated LED driver to attain a high-power factor (PF). The proposed control avoids complexities related to nonlinearities of the converter. The control action is initially derived from a group of rules written in accordance with experience and intuitive reasoning. The proposed technique is realized using a DSP processor (TI-TMS320F2812), which is capable of executing a high number of instructions in one cycle. A 70 W, 350 mA LED driver operating with an input of 90 V-230 V, 50 Hz was designed and implemented using MATLAB/Simulink. The results of the driver are in accordance with international regulations. The steady-state and transient responses are validated experimentally.

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Abate, Alessandro, Iury Bessa, Lucas Cordeiro, Cristina David, Pascal Kesseli, Daniel Kroening, and Elizabeth Polgreen. "Automated formal synthesis of provably safe digital controllers for continuous plants." Acta Informatica 57, no. 1-2 (December 6, 2019): 223–44. http://dx.doi.org/10.1007/s00236-019-00359-1.

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Abstract We present a sound and automated approach to synthesizing safe, digital controllers for physical plants represented as time-invariant models. Models are linear differential equations with inputs, evolving over a continuous state space. The synthesis precisely accounts for the effects of finite-precision arithmetic introduced by the controller. The approach uses counterexample-guided inductive synthesis: an inductive generalization phase produces a controller that is known to stabilize the model but that may not be safe for all initial conditions of the model. Safety is then verified via bounded model checking: if the verification step fails, a counterexample is provided to the inductive generalization, and the process further iterates until a safe controller is obtained. We demonstrate the practical value of this approach by automatically synthesizing safe controllers for physical plant models from the digital control literature.

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Abbas, Ghulam, Muhammad Qumar Nazeer, Valentina E. Balas, Tsung-Chih Lin, Marius M. Balas, Muhammad Usman Asad, Ali Raza, Muhammad Naeem Shehzad, Umar Farooq, and Jason Gu. "Derivative-Free Direct Search Optimization Method for Enhancing Performance of Analytical Design Approach-Based Digital Controller for Switching Regulator." Energies 12, no. 11 (June 7, 2019): 2183. http://dx.doi.org/10.3390/en12112183.

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Although an analytical design approach-based digital controller—which is essentially a deadbeat controller—shows zero steady-state error and no intersampling oscillations, it takes a finite number of sampling periods to settle down to a steady-state value. This paper describes the application of a derivative-free Nelder–Mead (N–M) simplex method to the digital controller for retuning of its coefficients intelligently to ensure improved settling and rise times without disturbing the deadbeat controller characteristics (i.e., no ripples between the sampling periods and no steady-state error). A switching-mode buck regulator working at 1 MHz in continuous conduction mode (CCM) is considered as a plant. Numerical simulation results depict that the N–M algorithm-based optimized digital controller not only shows improved steady-state and transient performance but also guarantees rigorous robustness against model uncertainty and disturbance as compared to its traditional counterpart, as well as the other optimized digital controller fine-tuned through other derivative-free metaheuristic optimization techniques, such as the genetic algorithm (GA). A system generator-based hardware software co-simulation is also performed to validate the simulation results.

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Більше джерел

Дисертації з теми "Digital state controller"

Гнип, Владислав Віталійович. "Підвищення точності керування багатовимірними системами". Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/41091.

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Магістерська дисертація містить описання вдосконаленого методу синтезу регулятора Р.Ізермана. Представлено, класифікації цифрових багатовимірних систем, математичні моделі та приклади використання методів-аналогів, виведення математичної моделі вдосконаленого методу, експериментальні дослідження вдосконаленого методу та його використання для підвищення точності систем керування з неквадратними матрицями.
The master's dissertation contains a description of the improved method of synthesis of the regulator of R. Izerman. Presented classifications of digital multidimensional systems, mathematical models and examples of using analog methods, derivation of a mathematical model of an improved method, experimental studies of an advanced method and its use to improve the accuracy of control systems with non-square matrices.

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Kocak, Elif. "Control Law Partitioning Applied To Beam And Ball System." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609564/index.pdf.

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In this thesis different control methods are applied to the beam and ball system. Test setup for the previous thesis is handled, circuit assemblies and hardware redesigned. As the system is controlled by the control law partitioning method by a computer, discrete time system model is created. The controllability and the observability of the system are analyzed and a nonlinear controller by using control law partitioning in other words computed torque is designed. State feedback control algorithm previously designed is repeated. In case of calculating the non measurable state variables two different reduced order observers are designed for these two different controllers, one for control law partitioning controller and the other for state-feedback controller. Two controller methods designed for the thesis study are tested in the computer environment using modeling and simulation tools (Also a different controller by using sliding mode controller is designed and tested in the computer environment using simulation tools). A controller software program is written for the designed controller algorithms and this software is tested on the test setup. It is observed that the system is stable when we apply either of the control algorithms.

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Britto, Jonas Reginaldo de. "Análise, projeto e implementação de conversores CC-CC com ampla faixa de conversão aplicados em iluminação de estado sólido." Universidade Federal de Uberlândia, 2009. https://repositorio.ufu.br/handle/123456789/14265.

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This work consists of the study, design and implementation of DC-DC converters, used in lighting systems based on light emitting diodes (LEDs). Can be powered by an universal AC voltage source or battery, and the current in the LEDs is controlled digitally. The main objective is to present a proposal of new step-up/down converters topologies with full conversion much higher than that of conventional converters. So, is initially presented an overview of solid-state lighting (SSL). Following is presented the study on the dynamic behavior of converters based on modeling by the method of varying state-space average, ending with the design of a digital PI controller. This work resulted in the application for a patent PI-0801425-6 filed with the INPI, which presents a new family of converters with full conversion extremely wide, called cubic converters.
O presente trabalho consiste do estudo, projeto e implementação de conversores CCCC, aplicados em sistemas de iluminação de estado sólido baseado em diodos emissores de luz (LEDs). Podem ser alimentados por uma fonte de tensão alternada universal ou por uma bateria sendo que a corrente nos LEDs é controlada digitalmente. O objetivo principal é apresentar uma proposta de novas topologias de conversores abaixadores/elevadores com faixa de conversão muito maior que a dos conversores convencionais. Portanto, inicialmente é apresentada uma visão geral sobre iluminação de estado sólido (SSL). Na sequência, é apresentado o estudo sobre o comportamento dinâmico dos conversores baseado na modelagem através do método de variáveis de espaço de estados médio, finalizando com o dimensionamento de um controlador PI digital. Este trabalho resultou no pedido de patente de invenção PI-0801425-6 depositado junto ao INPI, o qual apresenta uma nova família de conversores com faixa de conversão extremamente larga, denominados de conversores cúbicos.
Doutor em Ciências

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Oliveira, Fernando Henrique de. "Controle discreto de fonte modular de corrente aplicada a magnetos de aceleradores de partículas." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/6814.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Esta dissertação apresenta uma proposta de controle discreto baseado em reali-mentação de estados aplicado à fonte de alimentação das cargas magnéticas do Sirius. A fonte é formada por associações em série e em paralelo de módulos de menor po-tência para que, em conjunto, possam atender às exigências requeridas de tensão e de corrente dos magnetos. Cada módulo é constituído de dois estágios, um de entrada e outro de saída, em que o segundo é o objeto de estudo deste trabalho. O estágio de saída é constituído por um conversor ponte completa associado a um filtro de terceira ordem. Inicialmente é feita a modelagem do estágio de saída e apresentado um modelo apropriado a uma quantidade genérica de módulos associados em série. Em seguida é feita a discretização da planta e o controle em espaço de estados. Para a alocação dos pólos do sistema em malha fechada é utilizado o Regulador Quadrático Linear Digital. Entretanto, quando módulos são associados, aumenta-se consideravelmente a ordem do sistema e torna-se inviável a medição de todos os estados da planta. Então, é proposto um observador ótimo de ordem reduzida para que este seja capaz de fornecer ao con-trolador os estados que não são medidos. A análise de estabilidade permitiu verificar a robustez do controle em conjunto com o observador de estados. Na associação de módulos em paralelo foram consideradas que as correntes da saída de cada módulo são parcelas do estado que corresponde à corrente das cargas magnéticas. Baseado nesta premissa e no controle feito para o arranjo de módulos em série, foi proposta uma estratégia de controle para o arranjo em paralelo. Os resultados em simulação, tanto para a configuração de módulos em série quanto em paralelo, permitem verificar os desempenhos dinâmicos do controlador e observador de estados.
This dissertation presents a proposal of a discrete-time state-feedback control law applied to the Sirius magnetic source power supply. In order to meet the magnets' required voltage and current levels the source is formed by series and parallel associa-tion of modular converters. Each module is made up of two stages, input and output, in which the later is addressed this work. The output stage is constituted by a full bridge converter associated with a third-order filter. Initially a mathematical model is obtained for a single module. This model is later extended to represent the connection of several modules in series. Then the plant is discretized and state feedback law is designed to control the system. The optimal technique Digital Linear Quadratic Regu-lator was used to place the closed-loop poles. However, when modules are associated, due the order of the system it becomes impracticable to measure all the states. Then an optimal reduced order observer is proposed to provide to controller the states that are not measured. An stability analysis is performed in order to verify the controller robustness. For the association of modules in parallel was considered that the output currents of each module are the parcels of the state corresponding to the current of the magnetic loads. Based on this premise and in the previously control design for the series modules association, is proposed a control topology for the parallel arrange-ment. Simulation results were obtained, for the both configuration of modules series and parallel, and the performances of the controller and state-observer were verified.

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Qi, Lin. "Bioinspired Smart Surfaces with Switchable Wetting Properties for Droplet Manipulation and Controlled Drug Release." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555584165880048.

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Zhang, Junhong. "Bidirectional DC-DC Power Converter Design Optimization, Modeling and Control." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26126.

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In order to increase the power density, the discontinuous conducting mode (DCM) and small inductance is adopted for high power bidirectional dc-dc converter. The DCM related current ripple is minimized with multiphase interleaved operation. The turn-off loss caused by the DCM induced high peak current is reduced by snubber capacitor. The energy stored in the capacitor needs to be discharged before device is turned on. A complementary gating signal control scheme is employed to turn on the non-active switch helping discharge the capacitor and diverting the current into the anti-paralleled diode of the active switch. This realizes the zero voltage resonant transition (ZVRT) of main switches. This scheme also eliminates the parasitic ringing in inductor current. This work proposes an inductance and snubber capacitor optimization methodology. The inductor volume index and the inductor valley current are suggested as the optimization method for small volume and the realization of ZVRT. The proposed capacitance optimization method is based on a series of experiments for minimum overall switching loss. According to the suggested design optimization, a high power density hardware prototype is constructed and tested. The experimental results are provided, and the proposed design approach is verified. In this dissertation, a general-purposed power stage model is proposed based on complementary gating signal control scheme and derived with space-state averaging method. The model features a third-order system, from which a second-order model with resistive load on one side can be derived and a first-order model with a voltage source on both sides can be derived. This model sets up a basis for the unified controller design and optimization. The Î -type model of coupled inductor is introduced and simplified to provide a more clearly physical meaning for design and dynamic analysis. These models have been validated by the Simplis ac analysis simulation. For power flow control, a unified controller concept is proposed based on the derived general-purposed power stage model. The proposed unified controller enables smooth bidirectional current flow. Controller is implemented with digital signal processing (DSP) for experimental verification. The inductor current is selected as feedback signal in resistive load, and the output current is selected as feedback signal in battery load. Load step and power flow step control tests are conducted for resistive load and battery load separately. The results indicate that the selected sensing signal can produce an accurate and fast enough feedback signal. Experimental results show that the transition between charging and discharging is very smooth, and there is no overshoot or undershoot transient. It presents a seamless transition for bidirectional current flow. The smooth transition should be attributed to the use of the complementary gating signal control scheme and the proposed unified controller. System simulations are made, and the results are provided. The test results have a good agreement with system simulation results, and the unified controller performs as expected.
Ph. D.

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Sattouf, Mousa. "Systém snímání dat a ovládání vodní elektrárny prostřednictvím internetové techniky." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-233685.

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Vodní energie se nyní stala nejlepším zdrojem elektrické energie na zemi. Vyrábí se pomocí energie poskytované pohybem nebo pádem vody. Historie dokazuje, že náklady na tuto elektrickou energii zůstávají konstantní v průběhu celého roku. Vzhledem k mnoha výhodám, většina zemí nyní využívá vodní energie jako hlavní zdroj pro výrobu elektrické energie.Nejdůležitější výhodou je, že vodní energie je zelená energie, což znamená, že žádné vzdušné nebo vodní znečišťující látky nejsou vyráběny, také žádné skleníkové plyny jako oxid uhličitý nejsou vyráběny, což činí tento zdroj energie šetrný k životnímu prostředí. A tak brání nebezpečí globálního oteplování. Použití internetové techniky k ovladání několika vodních elektráren má velmi významné výhody, jako snížení provozních nákladů a flexibilitu uspokojení změny poptávky po energii na straně spotřeby. Také velmi efektivně čelí velkým narušením elektrické sítě, jako je například přidání nebo odebrání velké zátěže, a poruch. Na druhou stranu, systém získávání dat poskytuje velmi užitečné informace pro typické i vědecké analýzy, jako jsou ekonomické náklady, predikce poruchy systémů, predikce poptávky, plány údržby, systémů pro podporu rozhodování a mnoho dalších výhod. Tato práce popisuje všeobecný model, který může být použit k simulaci pro sběr dat a kontrolní systémy pro vodní elektrárny v prostředí Matlab / Simulink a TrueTime Simulink knihovnu. Uvažovaná elektrárna sestává z vodní turbíny připojené k synchronnímu generátoru s budicí soustavou, generátor je připojen k veřejné elektrické síti. Simulací vodní turbíny a synchronního generátoru lze provést pomocí různých simulačních nástrojů. V této práci je upřednostňován SIMULINK / MATLAB před jinými nástroji k modelování dynamik vodní turbíny a synchronního stroje. Program s prostředím MATLAB SIMULINK využívá k řešení schematický model vodní elektrárny sestavený ze základních funkčních bloků. Tento přístup je pedagogicky lepší než komplikované kódy jiných softwarových programů. Knihovna programu Simulink obsahuje funkční bloky, které mohou být spojovány, upravovány a modelovány. K vytvoření a simulování internetových a Real Time systémů je možné použít bud‘ knihovnu simulinku Real-Time nebo TRUETIME, v práci byla použita knihovna TRUETIME.

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Sedlář, Petr. "Digitálně řízený rezistor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218032.

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This master´s thesis deals with the design of the control circuits for digital potentiometers and their application in analog systems. Digital potentiometers are three-terminal resistors with an adjustable center connection. The digital potentiomneters enable to drive logic gates, LED drivers, LCD drivers, analog switches etc. Controlling of these mentioned devices is possible by the I2C 2- wire serial bus (invented by Philips). The digital potentiometers are used to control of the primary parameters like cut-off frequency and quality factor in the state variable filter and cut-off frequency in a passive filter. Both filters are simulated in PSpice and then compared with the measured results. Next parts of this master's thesis are a computer program and a exemplary protocol.

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Yang, Zhaoning. "Digital controller design for Cascaded-Multilevel-Converter based STATCOM systems." 2006. http://www.lib.ncsu.edu/theses/available/etd-11122006-000304/unrestricted/etd.pdf.

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Mundkur, Sameer Shailesh. "Design and implementation of a digital controller for high power converters." 2008. http://www.lib.ncsu.edu/theses/available/etd-11062008-124151/unrestricted/etd.pdf.

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Книги з теми "Digital state controller"

service), ScienceDirect (Online, ed. The automated lighting programmer's handbook. 2nd ed. Oxford: Focal, 2010.

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The automated lighting programmer's handbook. Amsterdam: Elsevier, Focal Press, 2004.

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Wernli, Karen J., and Erin J. Bowles. Breast Cancer Screening: Evidence and Recommendations. Edited by Christoph I. Lee, Constance D. Lehman, and Lawrence W. Bassett. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190270261.003.0002.

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Breast cancer screening in the United States was first recommended to women in 1976. Over the past decade, mammography screening has changed from film screen mammography to primarily digital mammography, which, as of 2016, accounts for over 97% of all mammograms performed in the United States. Several systematic reviews, which have included results from up to 9 randomized clinical trials from the United States, Europe, and Canada, have demonstrated a reduced risk of breast cancer mortality associated with breast cancer screening. Potential harms from breast cancer screening include false-positive mammograms (which may lead to unnecessary additional imaging and benign breast biopsies), overdiagnosis, and radiation exposure. This chapter summarizes evidence from randomized controlled trials for mortality benefit; current society and task force recommendations for mammography screening; evaluation of the evidence; risk–benefit analysis; and supplemental screening in high-risk women.

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Stromer-Galley, Jennifer. Presidential Campaigning in the Internet Age. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190694043.001.0001.

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Presidential candidates and their campaigns in the United States are fully invested in the use of social media. Yet, since 1996 presidential campaigns have been experimenting with ways to use digital communication technologies on the Internet to their advantage. This book tells the stories of the practices of campaigning online between 1996 and 2016, looking at winners and also-rans. The stories provide rich details of the factors that contribute to the success or failure of candidates, including the influence of digital media. The stories also show how political campaigns over six election cycles transitioned from the paradigm of mass media campaigning, to networked campaigning, and finally to mass-targeted campaigning. Campaigns shifted from efforts at mass persuasion to networked persuasion by identifying and communicating with super-supporters to give them the right digital tools and messages to take to their social network. Campaigns learned over time how to use the Internet’s interactive affordances to communicate with the public in ways that structures what supporters do for the campaign that maximizes strategic benefit—what I call “controlled interactivity.” By the 2016 campaign, technology companies made it easier and more effective to engage in mass-targeted campaigning—using large-scale data analytics by campaigns and tech companies to identify target audiences for campaigns to advertise to online.

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Schiller, Brad. Automated Lighting Programmer's Handbook. Taylor & Francis Group, 2016.

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Automated Lighting Programmer's Handbook. Taylor & Francis Group, 2016.

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Furuhata, Yuriko. Climatic Media. Duke University Press, 2022. http://dx.doi.org/10.1215/9781478022435.

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In Climatic Media, Yuriko Furuhata traces climate engineering from the early twentieth century to the present, emphasizing the legacies of Japan’s empire building and its Cold War alliance with the United States. Furuhata boldly expands the scope of media studies to consider technologies that chemically “condition” Earth’s atmosphere and socially “condition” the conduct of people, focusing on the attempts to monitor and modify indoor and outdoor atmospheres by Japanese scientists, technicians, architects, and artists in conjunction with their American counterparts. She charts the geopolitical contexts of what she calls climatic media by examining a range of technologies such as cloud seeding and artificial snowflakes, digital computing used for weather forecasting and weather control, cybernetics for urban planning and policing, Nakaya Fujiko’s fog sculpture, and the architectural experiments of Tange Lab and the Metabolists, who sought to design climate-controlled capsule housing and domed cities. Furuhata’s transpacific analysis offers a novel take on the elemental conditions of media and climate change.

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Air traffic control: FAA's transition of communications system to digital technology : fact sheet for the Chairman, Subcommittee on Transportation and Related Agencies, Committee on Appropriations, U.S. Senate. Washington, D.C: The Office, 1991.

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Частини книг з теми "Digital state controller"

Isermann, Rolf. "State Controller and State Observer." In Digital Control Systems, 180–227. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-86417-9_8.

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Starr, Gregory. "Digital Controller Design using State Space Methods." In Introduction to Applied Digital Controls, 131–76. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42810-5_7.

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Donzellini, Giuliano, Luca Oneto, Domenico Ponta, and Davide Anguita. "The Finite State Machine as System Controller." In Introduction to Digital Systems Design, 363–464. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92804-3_8.

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Taibi, Djamel, Toufik Amieur, Mohcene Bechouat, Moussa Sedraoui, and Sami Kahla. "Sensorless Control of DC-DC Converter Using Integral State Feedback Controller and Luenberger Observer." In Digital Technologies and Applications, 1477–88. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73882-2_134.

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Taibi, Djamel, Toufik Amieur, Mohcene Bechouat, Sami Kahla, and Moussa Sedraoui. "State Feedback Control of DC-DC Converter Using LQR Integral Controller and Kalman Filter Observer." In Digital Technologies and Applications, 1699–709. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73882-2_154.

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Isermann, Rolf. "State Controllers for Stochastic Disturbances." In Digital Control Systems, 37–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-86420-9_4.

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Abate, Alessandro, Iury Bessa, Dario Cattaruzza, Lucas Cordeiro, Cristina David, Pascal Kesseli, Daniel Kroening, and Elizabeth Polgreen. "Automated Formal Synthesis of Digital Controllers for State-Space Physical Plants." In Computer Aided Verification, 462–82. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63387-9_23.

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Donzellini, Giuliano, Luca Oneto, Domenico Ponta, and Davide Anguita. "La Macchina a Stati Finiti come controllore di sistema." In Introduzione al Progetto di Sistemi Digitali, 371–474. Milano: Springer Milan, 2017. http://dx.doi.org/10.1007/978-88-470-3963-6_8.

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Ferrara, Matteo, and Annalisa Franco. "Morph Creation and Vulnerability of Face Recognition Systems to Morphing." In Handbook of Digital Face Manipulation and Detection, 117–37. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87664-7_6.

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AbstractFace recognition in controlled environments is nowadays considered rather reliable, and very good accuracy levels can be achieved by state-of-the-art systems in controlled scenarios. However, even under these desirable conditions, digital image alterations can severely affect the recognition performance. In particular, several studies show that automatic face recognition systems are very sensitive to the so-called face morphing attack, where face images of two individuals are mixed to produce a new face image containing facial features of both subjects. Face morphing represents nowadays a big security threat particularly in the context of electronic identity documentsbecause it can be successfully exploited for criminal intents, for instance to fool Automated Border Control (ABC) systems thus overcoming security controls at the borders. This chapter will describe the face morphing process, in an overview ranging from the traditional techniques based on geometry warping and texture blending to the most recent and innovative approaches based on deep neural networks. Moreover, the sensitivity of state-of-the-art face recognition algorithms to the face morphing attack will be assessed using morphed images of different quality generated using various morphing methods to identify possible factors influencing the probability of success of the attack.

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"State Machine Design: The Electric Train Controller." In Rapid Prototyping of Digital Systems, 147–67. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-72671-7_8.

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Тези доповідей конференцій з теми "Digital state controller"

Calabrese, Marc A., Lee F. Skarbek, Parag H. Shah, and Mazen K. Yassine. "Using a Digital Fuel Control System and Digital Engine Controller for U.S. Navy LM2500 Engines." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30272.

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All United States Navy LM2500 gas turbine engines use a hydromechanical Main Fuel Control to meter the amount of fuel and air introduced into the engine based upon power demand and ambient conditions. The Main Fuel Control is one of the highest failure items on the LM2500 engine and is frequently the cause of costly high-speed engine stalls resulting from mis-rigged throttle or stator vane positioning linkages. Efforts are underway to upgrade the LM2500 with Woodward Governor Company’s state-of-the-art Digital Fuel Control system, subsequent to successful integration testing. The system consists of an off-engine fuel metering valve/actuator, a hydraulic pump/servo valve, and Variable Stator Vane hydraulic actuators equipped with electronic positioning feedback devices. The system will be controlled via one of two engine controllers; the Woodward MicroNet for CG-47 class ships and the Lockheed Martin Universal Engine Controller (UEC) “Plus” for DDG-51 class ships. This paper covers the development, land-based testing, shipboard testing, and fleet implementation of the Digital Fuel Control system in addition to associated engine controllers on the LM2500 engine.

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Jacobs, Joep, Shen Jie, and Dirk Hente. "A simple digital current controller for solid-state lighting." In 2008 IEEE Power Electronics Specialists Conference - PESC 2008. IEEE, 2008. http://dx.doi.org/10.1109/pesc.2008.4592303.

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Chiang, W. W. "Multirate state-space digital controller for sector servo systems." In 29th IEEE Conference on Decision and Control. IEEE, 1990. http://dx.doi.org/10.1109/cdc.1990.203951.

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Li, Bo, Jinshun Bi, Zhengsheng Han, Jiajun Luo, Xuefang Lin-Shi, Bruno Allard, and Li Chen. "A digital direct controller for buck converter." In 2014 IEEE 12th International Conference on Solid -State and Integrated Circuit Technology (ICSICT). IEEE, 2014. http://dx.doi.org/10.1109/icsict.2014.7021468.

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Diethold, Christian, H. Weis, I. Gushchina, A. Amthor, F. Hilbrunner, C. Diethold, and T. Frohlich. "Investigation on Digital Control Concepts for Dynamic Applications of Electromagnetic Force Compensated Balances." In NCSL International Workshop & Symposium. NCSL International, 2013. http://dx.doi.org/10.51843/wsproceedings.2013.20.

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This paper deals with the optimization of the dynamic performance of electromagnetic force compensated balances by alternative controller concepts. Concerning uncertainty of measurement and achievable resolution, balances based on the principle of electromagnetic force compensation represent the state of the art. Due to the high achievable resolution, the focus of the implementation is not concentrated on static weighing applications any longer, but also shifted towards dynamic purposes. Typical applications would be check-weigher or metering devices in pharmaceutical or food filling plants. There, the demand is not only to obtain the resolution at a high reproducibility, but also to reach a stable and reliable measurement result in a very short time. One possibility to achieve this goal is an optimization of the controller, whereas a PID controller represents the state of the art. For static applications, the PID controller’s performance is fairly good, but due to the limited number of parameters and the basic concept, the optimization potentialities for dynamic applications are restricted. An alternative approach is to realize the controller digitally. The advantage of this approach is, that the controller and filtering concept can be adapted unrestrictedly to the system to be controlled, and that parameters may be adjusted easily and online. With these concepts, the time to achieve a stable measurement signal can be diminished significantly. In this paper we will present detailed investigations on two commercially available Real-time systems (Controller and FPGA-based) for the implementation of digital control and filtering algorithms. The hardware restrictions were evaluated, and based on these results possible software realizations were tested. In accordance with the determined capabilities and limitations, a controller was designed. These first investigations emphasize the capabilities and potential of digital controllers.

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Sabirin, Chip Rinaldi, and Andreas Binder. "Rotor levitation by active magnetic bearing using digital state controller." In 2008 13th International Power Electronics and Motion Control Conference (EPE/PEMC 2008). IEEE, 2008. http://dx.doi.org/10.1109/epepemc.2008.4635500.

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Jing Wu and Min Zhou. "Digital PID controller designed and realized based on state machine." In 2016 IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC). IEEE, 2016. http://dx.doi.org/10.1109/imcec.2016.7867543.

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Tajuddin, M. F. N., N. A. Rahim, I. Daut, B. Ismail, and M. F. Mohammed. "State space averaging technique of power converter with digital PID controller." In TENCON 2009 - 2009 IEEE Region 10 Conference. IEEE, 2009. http://dx.doi.org/10.1109/tencon.2009.5395907.

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Liu, Lin, Jun-li Wang, Changyi Zhou, and Wenqi Ge. "All-solid-state laser controller design based on digital optical feedback." In Photonics Asia 2004, edited by ShuShen Deng, Akira Matsunawa, Y. Lawrence Yao, and Minlin Zhong. SPIE, 2005. http://dx.doi.org/10.1117/12.574424.

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Emadzadeh, Amir A., Thomas D. Lorentz, and Tsu-Chin Tsao. "Experiment and Comparison of Robust Linear and Sliding Mode Controllers for Regulation of a Magnetic Bearing System." In ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4232.

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Based on a reduced order state-space model of an MBC 500 magnetic bearing system with fixed shaft (i.e. non rotating), two different observer-based digital controllers are designed to regulate the shaft. One is a robust linear pole-placement controller, and the other is a sliding mode controller. Each controller’s performance is mathematically analyzed. Using a more representative higher order model of the fixed shaft, the controllers are numerically simulated to ensure stable operation. Then, the controllers are digitally implemented on an MBC 500 benchmark. Controller performance is compared by introducing un-modeled dynamics — in particular, continuous rotation of the shaft. Regulation performance is examined over a range of different rotation rates.

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