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Related Concept Videos

Control Systems01:10

Control Systems

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Control systems are everywhere in contemporary society, influencing diverse applications from aerospace to automated manufacturing. These systems can be found naturally within biological processes, such as blood sugar regulation and heart rate adjustment in response to stress, as well as in man-made systems like elevators and automated vehicles. A control system is essentially a network of subsystems and processes that collaboratively convert specific inputs into desired outputs.
At the heart...
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Control Systems: Applications01:25

Control Systems: Applications

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Electrical engineering plays a pivotal role in our daily lives, with control systems at the heart of many applications, from home appliances to sophisticated space shuttles. Control systems manage and regulate the behavior of devices and processes, ensuring they function safely, correctly, and efficiently.
In modern vehicles, control systems manage various functions to enhance performance and safety. The steering wheel and accelerator are primary inputs in a car's control system. The...
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Feedback control systems01:26

Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
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Open and closed-loop control systems01:17

Open and closed-loop control systems

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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal...
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Transfer Function in Control Systems01:21

Transfer Function in Control Systems

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The transfer function is a fundamental concept in the analysis and design of linear time-invariant (LTI) systems. It offers a concise way to understand how a system responds to different inputs in the frequency domain. It serves as a bridge between the time-domain differential equations that describe system dynamics and the frequency-domain representation that facilitates easier manipulation and analysis.
To derive the transfer function, consider a general nth-order linear time-invariant...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Data Communication Based on MQTT in a Polymer Extrusion Process
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Dimming control scheme for VLC systems based on multilevel data transmission.

Yu Zuo, Jian Zhang

    Applied Optics
    |November 22, 2018
    PubMed
    Summary

    This study introduces a new multilevel data transmission scheme for visible light communications (VLC) that enhances spectral efficiency. The novel approach integrates dimming control with high-speed data transmission, improving performance in VLC systems.

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    Area of Science:

    • Wireless Communications
    • Optical Engineering
    • Signal Processing

    Background:

    • Visible Light Communications (VLC) offer integrated high-speed data transmission and illumination.
    • Dimming control is crucial for energy savings and user comfort in VLC systems.
    • Traditional binary dimming schemes in VLC suffer from spectral inefficiency.

    Purpose of the Study:

    • To propose a novel multilevel data transmission scheme for VLC systems.
    • To enable simultaneous dimming control and high-speed data communication.
    • To enhance spectral efficiency and error performance in VLC.

    Main Methods:

    • Development of a novel multilevel data transmission scheme.
    • Design of a specific encoding/decoding structure for maintaining dimming levels.
    • Simulation-based performance evaluation.

    Main Results:

    • The proposed scheme achieves simultaneous dimming control and data transmission.
    • A specific symbol set ensures maintenance of distinct dimming levels.
    • Simulations demonstrate increased spectral efficiency and improved error performance.

    Conclusions:

    • The novel multilevel transmission scheme offers a significant advancement for VLC systems.
    • This approach addresses the spectral inefficiency of conventional dimming methods.
    • The proposed scheme enhances both communication and illumination functionalities in VLC.