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相关概念视频

Uncertainty: Overview00:59

Uncertainty: Overview

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In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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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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Random Error01:04

Random Error

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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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Random and Systematic Errors01:20

Random and Systematic Errors

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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
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Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
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状态估计中的预测不确定性驱动了主动传感.

Osman Kaan Karagoz1,2, Aysegul Kilic1, Emin Yusuf Aydin3

  • 1Electrical and Electronics Engineering, Middle East Technical University, 06800 Ankara, Turkey.

Bioinspiration & biomimetics
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概括
此摘要是机器生成的。

弱电鱼使用积极的感知运动,如全身振荡,以改善环境感知. 这项研究揭示了闭环控制机制是活跃感应和鱼类行为状态估计的关键.

关键词:
活动感应感应器传感器运动控制器国家估计估计.弱电鱼是一种弱电鱼.

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科学领域:

  • 神经科学是一个神经科学.
  • 动物行为 动物行为
  • 生物物理学的生物物理.

背景情况:

  • 动物积极修改感官信号以增强感知.
  • 驱动主动传感运动的机制在很大程度上是未知的.
  • 弱电鱼,Eigenmannia virescens,表现出寻找避难所的行为.

研究的目的:

  • 研究主动感应运动在 Eigenmannia virescens 避难所追踪中的作用.
  • 阐明感官退化期间刻板印象的全身振荡的潜在机制.
  • 检查主动感应如何影响状态估计中的任务性能.

主要方法:

  • 开发了一个封闭循环反控制模型用于避难所跟踪.
  • 使用开发的模型模拟鱼的轨迹.
  • 将模型预测与实际鱼类行为和现有模型进行比较.

主要成果:

  • 在 Eigenmannia virescens 中,活跃的感知运动可以最大限度地降低状态估计中的预测不确定性.
  • 闭环模型生成的模拟轨迹在统计学上无法与真实鱼类区分.
  • 开放循环和随机共振模型未能复制观察到的行为.

结论:

  • 闭环控制在主动传感行为中具有重要意义.
  • 主动传感动态调节感官信息,以改善感知.
  • 这些发现为感官处理的神经和行为机制提供了新的见解.