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相关概念视频

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...

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高频离散间隔二进制序列在异步C-VEP-basedBCI中用于减少视觉疲劳.

En Lai, Ximing Mai, Minghao Ji

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    |March 5, 2024
    PubMed
    概括
    此摘要是机器生成的。

    一种新的视觉刺激,离散间隔二进制序列 (DIBS),可以减少脑电脑接口 (BCI) 系统中的视觉疲劳,而不会影响性能. 这种方法提高了长期BCI可行性的用户友好性.

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    科学领域:

    • 神经科学是一个神经科学.
    • 生物医学工程 生物医学工程
    • 人与计算机的交互

    背景情况:

    • 基于代码调制的视觉唤起潜力 (c-VEP) 的脑计算机接口 (BCI) 系统通常会由于闪的刺激而导致视觉疲劳.
    • 优化视觉刺激对于提高用户舒适度和长期BCI系统可行性至关重要.

    研究的目的:

    • 在c-VEP BCI中引入和评估用于视觉刺激调制的新型离散间隔二进制序列 (DIBS).
    • 为了比较DIBS的性能和视觉疲劳水平与传统的m序调制.
    • 为了实现高正预测值 (PPV),低假阳性率 (FPR) 和高真阳性率 (TPR),同时尽量减少视觉疲劳.

    主要方法:

    • 开发了一个4个目标异步c-VEP-BCI系统.
    • 对比了两个视觉刺激调制:最大长度序列 (m-序列) 和离散间隔二进制序列 (DIBS).
    • 评估解码算法,包括CCA,TRCA及其波器银行变体 (FBCCA,FBTRCA) 以不同的权重方法.

    主要成果:

    • 在线实验中,DIBS调制实现了与m序列相比较的PPV,FPR和TPR.
    • 与眼睛相关的客观指标和主观问卷显示,与m-sequence相比,DIBS的视力疲劳明显降低.
    • 在异步c-VEP系统中,DIBS方法证明了减少视力疲劳的可行性.

    结论:

    • 离散间隔二进制序列 (DIBS) 是c-VEP BCI的可行和有效的视觉刺激调制.
    • DIBS为减少视觉疲劳,增强用户友好性和促进BCI系统的长期可行性提供了一个有前途的解决方案.
    • 这项研究为开发更舒适和可持续的BCI技术提供了宝贵的见解.