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相关概念视频

Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

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Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
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Design and Analysis for Fall Detection System Simplification
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一个动态的时空模型,用于降落警报和保护.

Shengqian Xu1, Zhihao Yang1, Daoyuan Wang1

  • 1Department of Biomedical Engineering, Zhejiang University, Hangzhou, 310027, China.

Medical & biological engineering & computing
|December 23, 2023
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概括

这项研究引入了一种新的摔倒检测系统,该系统可以识别早期警告的"不平衡点". 该系统旨在通过允许在撞击前恢复平衡的时间来预防摔倒伤害.

关键词:
余额回收模型 余额回收模型跌落点 跌落点 跌落点降落警报 降落警报 降落警报 降落警报不平衡点是指一个不平衡点.运动预测运动预测

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科学领域:

  • 生物力学 生物力学
  • 老年学是指老年学的学科.
  • 可穿戴技术是可穿戴的技术.

背景情况:

  • 跌倒是造成伤害的重要原因,特别是在老年人中.
  • 目前的跌倒检测系统主要集中在减轻冲击,而不是预防跌倒.
  • 需要主动的跌倒检测系统,可以预测和警告即将发生的跌倒.

研究的目的:

  • 提出和验证一个基于识别一个新的跌倒检测算法,以确定一个新的跌倒检测算法.
  • 不平衡点是指一个不平衡点.
  • 和和和和和和和和.
  • 跌落点 跌落点 跌落点
  • 在撞击之前.
  • 开发一个时空空间框架,整合运动预测和平衡恢复模型.
  • 评估算法的有效性,为防止跌倒提供及时警告.

主要方法:

  • 将运动预测和平衡恢复模型集成到时空空间框架中.
  • 使用微软Azure Kinect对动态和动态身体运动特征的分析.
  • 实验性试验与健康的年轻志愿者在正常,恢复和跌倒的场景.

主要成果:

  • 开发的算法实现了100%的灵敏度和98.6%的Fall Point检测特异性,平均交付时间为297 ms.
  • 在所有秋季试验中都检测到不平衡点,在秋季试验之前的平均间隔为315ms.
  • 这个间隔比老年人的典型步骤反应时间更长,这表明干预有足够的时间.

结论:

  • 拟议的算法表现出高精度和用于检测即将发生的落的交付时间.
  • 检测失衡点的能力为平衡恢复干预提供了一个关键的窗口.
  • 该系统显示了增强老年人落预警和保护系统的巨大潜力.