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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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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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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Convolution: Math, Graphics, and Discrete Signals01:24

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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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Updated: Sep 10, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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フィボナッチによる画像プライバシー保護 コミュニケーション・スキーム 交差点の拡散と不変異的離散的混沌

Zhiyu Xie1,2, Weihong Xie1,2, Xiyuan Cheng3

  • 1School of Electronic Information, University of Electronic Science and Technology of China Zhongshan Institute, Zhongshan 528402, China.

Entropy (Basel, Switzerland)
|August 28, 2025
PubMed
まとめ

この研究は,フィボナッチ数列と混沌としたシステムを用いた新しい画像暗号化方法を導入します. 強化されたアルゴリズムは,一般的な暗号攻撃に効果的に抵抗し,画像データのセキュリティを改善します.

キーワード:
暗号化画像の暗号化情報セキュリティ非線形ダイナミクスプライバシーを守る

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関連する実験動画

Last Updated: Sep 10, 2025

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科学分野:

  • コンピュータ科学
  • 暗号化
  • 情報セキュリティ

背景:

  • ネットワーク通信の急速な進歩は,画像の保存と送信の強力なセキュリティを必要とします.
  • 既存の画像暗号化技術は 複雑なセキュリティの脅威に対応できていません
  • マルチメディアの情報セキュリティは,現代のデジタル環境における重要な問題です.

研究 の 目的:

  • 強化された画像セキュリティ通信スキームを提案する.
  • 既知のプレーンテキストと選択されたプレーンテキストの攻撃に対する抵抗性を向上させる.
  • 画像データの保存と送信の全体的なセキュリティを強化します.

主な方法:

  • 文字から最初のキー生成のためのハッシュ関数を使用します.
  • 擬似ランダムな配列を生成するための非退化混沌系を使用します.
  • フィボナッチ交差拡散とランダムな方向の混乱を暗号化するために適用します.
  • 純文字の相関メカニズムとフィードバックループを組み込む.

主要な成果:

  • アルゴリズムは効果的な混乱,拡散,雪崩効果を示しています.
  • 堅固なパスワード空間と強力な数値統計特性を達成します.
  • 経験的な結果は理論的な暗号要求を検証します.

結論:

  • 提案されたスキームは,暗号攻撃に対する抵抗性を大幅に強化します.
  • フィボナッチ交互拡散と混沌としたシステムの統合は 画像セキュリティの強力な解決策を提供します
  • この方法は,マルチメディアシステムの画像の保存と送信を効果的に保護します.