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相关概念视频

Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

4.4K
Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
8.2K
Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

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Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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DeGCN:用于基于骨架的动作识别的可变形图形卷积网络.

Woomin Myung, Nan Su, Jing-Hao Xue

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    概括
    此摘要是机器生成的。

    本研究介绍了一个可变形图卷积网络 (DeGCN),用于基于骨架的动作识别. DeGCN以适应的方式捕获信息关节,通过学习灵活的时空连接来提高准确性.

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    科学领域:

    • 计算机视觉 计算机视觉
    • 机器学习 机器学习
    • 人工智能的人工智能

    背景情况:

    • 基于骨架的动作识别利用人体图形拓学.
    • 现有的图形卷积网络 (GCN) 使用不灵活的消息聚合,无法考虑类内变化和骨架序列中的冗余连接.

    研究的目的:

    • 提出一种新的可变形图卷积网络 (DeGCN),用于基于骨架的适应性和准确的动作识别.
    • 解决当前GCN在处理多样化的动作样本和杂的骨架数据方面的局限性.

    主要方法:

    • 开发了可变形图卷积网络 (DeGCN),可以在空间和时间图上进行可变形采样.
    • 为时间特征集成的连续隐藏空间,以捕捉固有的动作连续性.
    • 设计了一种创新的多部门框架,用于关节和骨的模式,平衡准确性和模型大小.

    主要成果:

    • 在NTU RGB+D,NTU RGB+D 120和NW-UCLA数据集上实现了最先进的性能.
    • 证明了DeGCN能够适应性地捕获信息关节并感知歧视性受体场的能力.
    • 展示了多部门框架在增强整体效应和模型效率方面的有效性.

    结论:

    • 拟议的DeGCN方法显著推进了基于骨架的动作识别.
    • 可变形图形卷曲提供了一种更适合的方法,用于从骨架数据分析复杂的人类行为.
    • 多部门框架为行动识别任务提供了强大而高效的解决方案.