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関連する概念動画

Receiver Operating Characteristic Plot01:15

Receiver Operating Characteristic Plot

461
A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
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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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Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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Carrier Generation and Recombination01:22

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
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Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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関連する実験動画

Updated: Jan 8, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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低複雑度なコヒーレント伝送のためのマルチステージ分布マッチングに基づく確率的シェーピング符号化変調

Hao Shi, Jian Zhao, Lingguo Cao

    Optics express
    |December 19, 2025
    PubMed
    まとめ

    新しい乗算不要アルゴリズムは、ビットレベル演算を使用して信号分布マッチングを簡素化します。この方法は、従来の技術と比較して、光信号対雑音比を向上させ、複雑さを低減します。

    キーワード:
    確率的シェーピング分布マッチング光通信低複雑度乗算不要アルゴリズム

    さらに関連する動画

    Quasi-light Storage for Optical Data Packets
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    関連する実験動画

    Last Updated: Jan 8, 2026

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    Quasi-light Storage for Optical Data Packets
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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    科学分野:

    • 光通信
    • デジタル信号処理

    背景:

    • 確率的シェーピング（PS）は、光通信システムの最適化に不可欠です。
    • 定数組成分布マッチング（CCDM）のような古典的な分布マッチング方法は、複雑な算術符号化と乗算操作を含みます。

    研究 の 目的:

    • 新しい乗算不要マルチステージ分布マッチング（MSDM）アルゴリズムを導入し、検証すること。
    • MSDMの複雑性とパフォーマンスの点で従来のアルゴリズムに対する利点を示すこと。

    主な方法:

    • 提案されたMSDMアルゴリズムは、シンボル確率をビット確率に分解します。
    • 乗算負荷の高い算術符号化の代わりに、単純なビットレベル論理演算を使用します。
    • このアルゴリズムは、光システムにおける確率的シェーピングのために実験的に検証されました。

    主要な成果:

    • MSDMベースのPS-16QAM信号は、均一分布信号と比較して1.28dBの光信号対雑音比ゲインを達成しました。
    • 提案手法は、CCDMよりも大幅に低い計算複雑性を示しました。
    • MSDMは、逆分布マッチングプロセスにおけるエラー伝播効果を緩和しました。

    結論:

    • 乗算不要MSDMアルゴリズムは、確率的シェーピングのための効率的で高性能な代替手段を提供します。
    • MSDMは、光通信システムにおける複雑性を低減するための実用的なソリューションを提供します。
    • このアプローチは、信号シェーピングを強化し、既存の方法の一般的な欠点を軽減します。