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相关概念视频

Inertial Frames of Reference01:03

Inertial Frames of Reference

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Muscles that Move the Head01:19

Muscles that Move the Head

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The muscles that move the head are a dynamic and complex group of structures that work together to facilitate a wide range of head movements, including rotation, flexion, extension, and lateral bending.
The bilateral sternocleidomastoid, or SCM, and the suprahyoid and infrahyoid muscles are significant head flexors. The SCM muscles originate at the sternum and clavicle and attach to the mastoid process of the temporal bone. The SCM contracts bilaterally to bend the head forward, whereas...
6.1K
Setting Time of Cement01:12

Setting Time of Cement

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The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
734
Arteries of the Head and Neck01:26

Arteries of the Head and Neck

3.6K
The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
The internal carotid arteries supply blood to the anterior portion of the cerebrum. They enter the...
3.6K
Veins of Head and Neck01:19

Veins of Head and Neck

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The blood drainage from the head and neck is primarily managed by three pairs of veins: the external jugular, internal jugular, and vertebral veins. The external jugular veins drain superficial scalp and face structures, passing over the sternocleidomastoid muscles to empty into the subclavian veins.
On the other hand, the vertebral veins, unlike their arterial counterparts, are not primarily responsible for brain drainage. Instead, they drain the cervical vertebrae, spinal cord, and some small...
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相关实验视频

Updated: Feb 14, 2026

Evaluation of a Smartphone-based Human Activity Recognition System in a Daily Living Environment
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从头部上的惯性传感器对人类活动进行开放式识别.

Angela Cortese1, Sarah Solbiati1, Alice Scandelli1

  • 1Department of Electronics, Information and Bioengineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy.

Sensors (Basel, Switzerland)
|February 13, 2026
PubMed
概括
此摘要是机器生成的。

本研究引入了使用可穿戴传感器进行人类活动识别 (HAR) 的开放式识别框架. 它有效地识别了未知的活动,提高了基于传感器的系统的真实可靠性.

关键词:
人类活动的认可 人类活动的认可惯性测量单位是惯性测量单位.开放式集识别的识别方法智能眼镜是一款智能眼镜.可以穿戴的传感器.

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A View of Their Own: Capturing the Egocentric View of Infants and Toddlers with Head-Mounted Cameras
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Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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相关实验视频

Last Updated: Feb 14, 2026

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A View of Their Own: Capturing the Egocentric View of Infants and Toddlers with Head-Mounted Cameras
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Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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科学领域:

  • 生物医学工程 生物医学工程
  • 机器学习 机器学习
  • 可穿戴技术可穿戴技术

背景情况:

  • 使用惯性测量单位 (IMU) 的人类活动识别 (HAR) 对医疗保健和健身至关重要.
  • 由于存在未见的活动 (封闭集限制),现有的HAR方法与现实世界的场景作斗争.

研究的目的:

  • 通过实施开放式集识别 (OSR) 框架,使HAR分类器适应现实世界的应用.
  • 用智能眼镜IMU数据评估OSR在识别未知活动方面的有效性.

主要方法:

  • 在六轴IMU数据上训练了一个轻量级的1D卷积神经网络.
  • 在一个广泛的评估中,在两个数据集 (专有数据和UCA-EHAR) 上使用了一个离开一个活动的协议.
  • 通过使用logit空间方法评估开放式HAR性能,例如GMM,KDE,OpenMax和NNdr.

主要成果:

  • 在ROC曲线下的面积 (AUC) 大于0.8.8的情况下,可以对未知活动进行可靠的识别.
  • 该OSR框架以最小的计算开销证明了它的有效性.
  • 该研究验证了专有数据和公共数据集 (UCA-EHAR) 的发现.

结论:

  • 低复杂性的OSR方法在资源有限的可穿戴设备上具有实时 HAR 的巨大潜力.
  • 这项研究支持开发适应性和可靠的基于传感器的识别系统,用于实际应用.
  • 这些发现为更强大的HAR系统铺平了道路,能够处理新型活动.