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相关概念视频

Even and Odd Signals01:17

Even and Odd Signals

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An even signal, whether in continuous-time or discrete-time, is defined by its symmetry with its time-reversed version. Mathematically, this is represented as
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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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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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Basic Discrete Time Signals01:16

Basic Discrete Time Signals

314
The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is...
314
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

529
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
529
Basic Continuous Time Signals01:22

Basic Continuous Time Signals

388
Basic continuous-time signals include the unit step function, unit impulse function, and unit ramp function, collectively referred to as singularity functions. Singularity functions are characterized by discontinuities or discontinuous derivatives.
The unit step function, denoted u(t), is zero for negative time values and one for positive time values, exhibiting a discontinuity at t=0. This function often represents abrupt changes, such as the step voltage introduced when turning a car's...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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相关实验视频

Updated: Sep 19, 2025

Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
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混沌同步使用基于自适应式双屏障功能的非单元控制,并应用到心电图信号加密.

Behrouz Vaseghi1, Saleh Mobayen2, Somayeh Hashemi1

  • 1Department of Electrical Engineering, Ab. C., Islamic Azad University, Abhar, Iran.

Computers in biology and medicine
|June 4, 2025
PubMed
概括

本研究引入了一种基于混乱的新型加密方法,用于保护电子健康记录 (EHR) 数据. 该技术可确保快速同步和强大的密钥生成,以确保电子健康应用中的数据保密性.

关键词:
生物医学信号 生物医学信号混沌同步的同步方式混乱的加密方式.非线性系统是非线性系统.滑动模式控制器 滑动模式控制器

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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相关实验视频

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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科学领域:

  • 密码学 密码学 密码学 密码学
  • 生物医学工程 生物医学工程
  • 控制系统 控制系统

背景情况:

  • 基于混乱的加密对于数字照片,生物医学信号和远程医疗中的数据保密至关重要.
  • 有效的加密技术需要混乱系统之间的快速和可靠的同步.

研究的目的:

  • 为混乱系统提供快速可靠的同步提供适应终端滑动模式控制规律.
  • 开发一种强大的混乱密钥生成方法,并评估其随机性.
  • 实现基于XOR的ECG信号加密算法,使用混乱掩盖.

主要方法:

  • 适应式终端滑动模式控制法用于同步.
  • 混沌密钥生成和随机性评估使用testU01和NIST 800-22.
  • 基于XOR的加密,用于ECG信号的混沌掩盖.

主要成果:

  • 拟议的方法实现了高效的同步,对参数不确定性具有稳定性.
  • 该加密方案表现出对具有很大的密钥空间 (2^605) 的攻击的高度稳定性.
  • 电脑心电图信号加密显示与普通信号的相关性接近零,信息度高 (7.9512).
  • 混乱的密钥生成产生了优越的随机性 (在测试P值中为0.9781).

结论:

  • 开发的方法为混乱系统提供了快速,高效和强大的同步.
  • 这种加密技术提供了强大的安全性,可以抵御已知的攻击,适合敏感数据.
  • 该方法适用于在电子健康系统中安全无线传输医疗信号,用于疾病监测和诊断.