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相关概念视频

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Agonism and Antagonism: Quantification01:14

Agonism and Antagonism: Quantification

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When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Molecular Orbital Theory I02:35

Molecular Orbital Theory I

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Overview of Molecular Orbital Theory
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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相关实验视频

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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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一个基于sememes的单词级对抗性攻击方法和一个改进的量子行为粒子群集优化.

Qidong Chen, Jun Sun, Vasile Palade

    IEEE transactions on neural networks and learning systems
    |June 19, 2023
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    概括

    这项研究引入了一种新的词级对抗性攻击,使用sememes和一个改进的量子行为粒子群集优化 (QPSO) 算法. 该方法为具有高攻击成功率和语义相似性的自然语言处理模型生成有效的对抗示例.

    科学领域:

    • 自然语言处理自然语言处理.
    • 人工智能的人工智能
    • 计算语言学 计算语言学

    背景情况:

    • 文本对抗性攻击旨在通过改变输入文本来操纵模型行为.
    • 现有的方法在维护文本质量和攻击有效性方面面临挑战.

    研究的目的:

    • 提出一个有效的词级对抗性攻击方法,使用sememes和一个改进的量子行为粒子群集优化 (QPSO) 算法.
    • 通过减少搜索空间和提高QPSO算法的融合和探索能力来增强对抗性示例的搜索.

    主要方法:

    • 利用基于sememe的单词替换策略来创建对抗性示例的缩小搜索空间.
    • 开发了一种以历史信息为导向的QPSO,具有随机漂移局部吸引器 (HIQPSO-RD) 算法,用于高效的搜索.
    • 实施了两阶段的多样性控制策略,以进一步优化搜索性能.

    主要成果:

    • 与最先进的对抗性攻击方法相比,提出的HIQPSO-RD方法实现了更高的攻击成功率.
    • 生成的对抗性示例显示更低的修改率,同时保持语义相似性和语法正确性.
    • 人类评估证实了在语法和困惑性 (PPL) 方面对抗性示例的优越质量.

    结论:

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    • 新型基于sememe和HIQPSO-RD的方法为文本对抗性攻击提供了更有效和更强大的方法.
    • 这种技术成功地平衡了攻击效率与自然语言处理模型中语言属性的保存.