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相关概念视频

Carbon Skeletons01:12

Carbon Skeletons

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Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
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Muscle Coordination and Action01:24

Muscle Coordination and Action

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Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....
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Fixed Action Patterns01:06

Fixed Action Patterns

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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Classification of Bones01:18

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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...
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Anatomical Movements00:51

Anatomical Movements

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Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints.
Here are some common anatomical movements:
Flexion and extension motions are in the sagittal (anterior–posterior) plane of motion. These movements take place at the shoulder, hip, elbow, knee, wrist,...
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The craniofacial muscles are a collection of approximately 20 thin skeletal muscles situated beneath the skin of the face and scalp. These muscles, primarily responsible for the vast array of human facial expressions, originate from the bones or fibrous structures of the skull and extend outwards to connect with the skin. While most skeletal muscles in the body are enveloped in thick fascia, facial muscles generally have a more delicate fascial covering, with the buccinator muscle being a...
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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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AL-SAR:为基于骨架的行动识别提供主动学习.

Jingyuan Li, Trung Le, Eli Shlizerman

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    概括
    此摘要是机器生成的。

    本研究介绍了 Active Learning for Sequences (AL-SAR),这是一种新的动作识别方法,通过将无监督学习与稀疏注释相结合,最大限度地减少了所需的标签. 通过使用编码解码框架,AL-SAR有效地识别时间序列中的人类行为.

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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:

    • 从时间序列中识别动作通常需要在监督训练中进行广泛的基础真理注释.
    • 现有的无监督的序列组织方法仍然需要注释来将集群与特定动作联系起来.
    • 广泛的注释要求的挑战推动了对高效的分类方法的需求,以尽量减少标签的使用.

    研究的目的:

    • 为序列数据引入一种名为AL-SAR的新型主动学习 (AL) 方法,旨在减少对广泛注释的需求.
    • 开发一种分类方法,有效地将需要的标签数量最小化,以准确识别动作.
    • 提高在时间多变量序列中的动作识别的效率和准确性.

    主要方法:

    • AL-SAR将无监督训练与对序列数据的稀疏监督注释相结合.
    • 它使用了一个编码器-解码器框架,具有多头机制,用于在潜在空间中进行强大的不确定性评估.
    • 该方法以代方式选择那些注释最大限度地有助于解开隐性空间的样本.

    主要成果:

    • AL-SAR在基准数据集上进行了评估,包括NW-UCLA,NTU RGB+D 60和UWA3D.
    • 拟议的AL-SAR方法,当与编码器-解码器网络相结合时,与使用相同网络结构的其他AL方法相比,显示出更高的性能.
    • 结果表明,AL-SAR有效地减少了注释负担,同时保持了高的动作识别准确度.

    结论:

    • AL-SAR在基于序列的动作识别的积极学习中取得了重大进展.
    • 该方法提供了一种更有效的方法来训练动作识别模型,通过尽量减少对标记数据的需求.
    • 在不确定性评估和潜在空间解方面,AL-SAR的有效性有助于其卓越的性能.