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相关概念视频

Root Loci for Positive-Feedback Systems01:23

Root Loci for Positive-Feedback Systems

123
The Hartley oscillator is a positive feedback system that sustains oscillations by feeding the output back to the input in phase, thereby reinforcing the signal. Positive feedback systems can be viewed as negative feedback systems with inverted feedback signals. In these systems, the root locus encompasses all points on the s-plane where the angle of the system transfer function equals 360 degrees.
The construction rules for the root locus in positive feedback systems are similar to those in...
123
Feedback control systems01:26

Feedback control systems

314
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...
314
Positive and Negative Feedback Loops01:18

Positive and Negative Feedback Loops

19.2K
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
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Open and closed-loop control systems01:17

Open and closed-loop control systems

753
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...
753
Control System Problem01:21

Control System Problem

119
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
119
PID Controller01:19

PID Controller

119
Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...
119

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相关实验视频

Updated: Jul 6, 2025

Closed-loop Neuro-robotic Experiments to Test Computational Properties of Neuronal Networks
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基于关键嵌套极子代码和反神经网络的安全RoF系统.

Yaoqiang Xiao, Tian Xie, Zhiyi Wang

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    |January 5, 2024
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    概括
    此摘要是机器生成的。

    一个新的安全无线电光纤系统使用嵌套的极点代码和反神经网络 (FNN) 来增强6G信息安全. 这种方法提高了接收的光学功率增益,并抵御各种网络攻击.

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    相关实验视频

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    Published on: March 2, 2015

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    A Protocol for the Administration of Real-Time fMRI Neurofeedback Training
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    科学领域:

    • 信息安全 信息安全
    • 电信工程 电信工程 电信工程
    • 编码理论编码理论

    背景情况:

    • 6G网络的出现需要先进的信息安全解决方案.
    • 无线电在光纤 (RoF) 系统对于高速数据传输至关重要.
    • 对于未来的网络,RoF系统中现有的安全措施需要加强.

    研究的目的:

    • 提出一个安全的RoF系统,利用关键嵌套极点代码和反神经网络 (FNN).
    • 加强6G通信系统中的信息安全.
    • 在纠错和功率效率方面提高RoF系统的性能.

    主要方法:

    • 实现一个密钥嵌套的极点代码,对信息位进行混乱加密.
    • 使用4D细胞神经网络来生成加密的混乱序列.
    • 采用直角频率分割复杂化 (OFDM) 和16-QAM进行信号调制.
    • 使用连续取消列表 (SCL) 和FNN解码器以实现高效的数据恢复.

    主要成果:

    • 与现有方案相比,拟议的系统显示了显著的接收光功率 (ROP) 增加 (1.2-1.6 dB在10^-3位错误率).
    • 与使用极性码的传统OFDM相比,实现了约1dB的ROP增益.
    • 验证了混乱的密钥序列的安全性,以防止暴力攻击和选择纯文本攻击.

    结论:

    • 拟议的安全RoF系统有效地提高了6G网络的信息安全性.
    • 该系统在纠错和信号接收方面实现了卓越的性能.
    • 嵌套极码和FNN的集成为安全的光学无线通信提供了强大的解决方案.