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相关概念视频

Types of Errors: Detection and Minimization01:12

Types of Errors: Detection and Minimization

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Error is the deviation of the obtained result from the true, expected value or the estimated central value. Errors are expressed in absolute or relative terms.
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
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RL Circuits01:14

RL Circuits

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An RL circuit consists of a resistor and an inductor and may have a source of emf connected to it. The inductor in the circuit helps to prevent rapid changes in current, which can be helpful if a steady current is required but the external source has a fluctuating emf. Consider an open RL circuit connected to a source of constant emf. As soon as the circuit is closed, the current begins to increase at a rate that depends only on the value of the inductance in the circuit. The greater the...
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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

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Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
106
Radial System Protection01:23

Radial System Protection

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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
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Routh-Hurwitz Criterion II01:19

Routh-Hurwitz Criterion II

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In the application of the Routh-Hurwitz criterion, two specific scenarios can arise that complicate stability analysis.
The first scenario occurs when a singular zero appears in the first column of the Routh table. This situation creates a division by zero issues. To resolve this, a small positive or negative number, denoted as epsilon (∈), is substituted for the zero. The stability analysis proceeds by assuming a sign for ∈. If ∈ is positive, any sign change in the first...
300
Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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相关实验视频

Updated: Jul 25, 2025

Three Laboratory Procedures for Assessing Different Manifestations of Impulsivity in Rats
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在可靠性限制下的RIS辅助URLLC系统中尽量减少延迟.

Xiaoyang Song1, Yingxin Zhao1,2, Wannan Zhao1

  • 1College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China.

Entropy (Basel, Switzerland)
|June 28, 2023
PubMed
概括

可重新配置的智能表面 (RIS) 增强了物联网 (IoT) 的超可靠的低延迟通信 (URLLC). 我们的ADMM算法尽量减少延迟,同时确保可靠性,优于传统方法.

关键词:
在这个问题上,ADMM是ADMM,ADMM是ADMM.物联网 (IoT) 网络物联网 (IoT) 的网络物联网.这里是RIS RIS.URLLC 是一个URLLC.

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相关实验视频

Last Updated: Jul 25, 2025

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科学领域:

  • 无线通信无线通信
  • 信号处理 信号处理
  • 物联网的物联网,就是物联网.

背景情况:

  • 超可靠和低延迟通信 (URLLC) 对物联网 (IoT) 网络至关重要.
  • 严格的服务质量 (QoS) 要求需要提高链路质量和可靠性.
  • 可重新配置的智能表面 (RIS) 为改善URLLC系统中的链接质量提供了一个有希望的解决方案.

研究的目的:

  • 在RIS辅助的URLLC上链系统中最大限度地降低传输延迟.
  • 满足物联网应用程序的严格可靠性约束.
  • 开发一个低复杂度的算法,以优化RIS相位移.

主要方法:

  • 在可靠性约束下,将延迟最小化作为问题.
  • 采用了乘数的交替方向方法 (ADMM) 来解决非凸的优化问题.
  • 解决了RIS相位转移优化问题,将其制定为一个方程约束方程编程 (QCQP) 问题.

主要成果:

  • 与传统的半确定的放松 (SDR) 方法相比,提出的基于ADMM的方法取得了更高的性能.
  • 显示的计算复杂性明显低于基于SDR的方法.
  • 实现了对RIS辅助URLLC系统的传输延迟大幅降低.

结论:

  • 拟议的ADMM算法有效地减少了RIS辅助URLLC系统中的延迟.
  • RIS的部署显示了在苛刻的物联网网络中提高可靠性的巨大潜力.
  • 该方法为未来的URLLC应用提供了实用和高效的解决方案.