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相关概念视频

Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

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In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
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BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

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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....
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Linear time-invariant Systems01:23

Linear time-invariant Systems

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A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...
407
Convolution Properties I01:20

Convolution Properties I

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Convolution computations can be simplified by utilizing their inherent properties.
The commutative property reveals that the input and the impulse response of an LTI (Linear Time-Invariant) system can be interchanged without affecting the output:
236
Classification of Systems-I01:26

Classification of Systems-I

296
Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
Homogeneity dictates that if an input x(t) is multiplied by a constant c, the output y(t) is multiplied by the same constant. Mathematically, this is expressed as:
296
Convolution: Math, Graphics, and Discrete Signals01:24

Convolution: Math, Graphics, and Discrete Signals

399
In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
To simplify the convolution integral, it is assumed that both the input signal and impulse response are zero for negative time values. The graphical convolution process...
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相关实验视频

Updated: Sep 10, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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基于混乱系统和非线性转换的安全和高效的图像加密方案

Wassim Alexan1, Noura H El Shabasy2, Noha Ehab3

  • 1Communications Department, Faculty of Information Engineering and Technology, German University in Cairo (GUC), New Cairo, Egypt. wassim.alexan@ieee.org.

Scientific reports
|August 25, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的多图像加密方法,使用5D超混乱系统,阿诺德的猫地图和兰顿的. 该技术为数字图像加密提供了更高的安全性和效率,优于传统方法.

关键词:
阿诺德的猫地图混乱地图密码学超混沌系统图像的加密兰顿的安全分析

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Last Updated: Sep 10, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
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科学领域:

  • 计算机科学
  • 密码学
  • 信息安全

背景情况:

  • 由于越来越多的数据和物联网采用, 数字图像加密至关重要.
  • 由于冗余和实时需求,AES和DES等传统方法对于图像数据是不够的.

研究的目的:

  • 提出一种新,安全,高效的多图像加密方案.
  • 解决数字图像传统加密的局限性.

主要方法:

  • 整合一个5D超混沌系统来生成密钥.
  • 使用阿诺德的猫地图进行转换和兰顿的进行像素编码 (扩散).
  • 一个新设计的字节替换S-box.

主要成果:

  • 实现了大键空间和低像素相关性.
  • 证明了快速加密速度 (对于512x512图像的0.1602秒).
  • 安全分析 (组图,相关性,,NPCR,UACI,NIST测试) 证实了强度.

结论:

  • 拟议的混合加密方法提供了高安全性和效率.
  • 它适用于实时应用,并且可以抵抗各种攻击.
  • 超越现有的混沌和混合加密技术.