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関連する概念動画

Masking and Demasking Agents01:19

Masking and Demasking Agents

3.7K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
3.7K
Crown Ethers02:36

Crown Ethers

6.2K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
6.2K
Protecting Groups for Aldehydes and Ketones: Introduction01:23

Protecting Groups for Aldehydes and Ketones: Introduction

9.2K
Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.
9.2K
Protection of Alcohols02:31

Protection of Alcohols

8.1K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
8.1K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.5K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.5K

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関連する実験動画

Updated: Feb 21, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

9.0K

チェーン組み込みマスキングに基づく高セキュリティの浮動確率暗号化方法.

Haisu Qian, Bo Liu, Jianxin Ren

    Optics express
    |February 20, 2026
    PubMed
    まとめ
    この要約は機械生成です。

    この研究は,ユニークなコンステレーションデザインを使用した光学ネットワークのための新しい暗号化方法を導入します. 階層的な三角形変形六角形 (HTDH) 16QAMの星座は,送信の安全性と受信機の感度を改善します.

    関連する実験動画

    Last Updated: Feb 21, 2026

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

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

    Published on: September 5, 2019

    9.0K

    科学分野:

    • 光通信ネットワークは,光学通信ネットワークです.
    • 情報セキュリティ 情報セキュリティ
    • シグナル処理 信号処理

    背景:

    • 光学アクセスネットワークにおける伝送性能とセキュリティに対する要求が高まっています.
    • データの完全性と機密性を保護するために,高度な暗号化方法の必要性.
    • 性能とセキュリティのバランスをとる上で,従来の調節スキームの限界.

    研究 の 目的:

    • 光学アクセスネットワークのチェーン組み込みマスキングに基づく高セキュリティの浮動確率暗号化方法を提案する.
    • 伝送電力を減らし,安全性を高める新しいコンステレーション構造を設計する.
    • 伝送セキュリティとシステムの感受性の共最適化を調査する.

    主な方法:

    • 階層的な三角形-歪んだ六角形 (HTDH) の星座を持つチェーン埋め込みマスク技術の開発.
    • 座標点のダイナミックな混乱のためにローレンツのカオスモデルを利用する.
    • 7コアファイバートランスミッションシステムでの実験的検証.

    主要な成果:

    • HTDH 16 Quadrature Amplitude Modulation (16QAM) のコンステレーションでは,従来の16QAMと比較して受信機の感度が0.48dB改善され,ビットエラー率は3.8 × 10−3.3であった.
    • 暗号化された信号は,暗号化されていない信号よりも0.33dBの感度向上を示した.
    • 提案された方法は,0.444.のコンステレーションフィギュア・オブ・メリット (CFM) 値を達成しました.

    結論:

    • 提案された暗号化方法は,光学ネットワークにおける伝送セキュリティを効果的に強化します.
    • HTDHコンステレーションの設計は暗号化メカニズムと連携し,受信機の感度を改善します.
    • この研究は,革新的な調節と暗号化を通じて,伝送セキュリティとシステムの感受性を共最適化することを示しています.