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相关概念视频

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

549
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
549
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

405
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
405
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

453
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
453
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

273
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
273
Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

437
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
437
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

442
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
442

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相关实验视频

Updated: Sep 18, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

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基于大规模实时轨迹数据的动态轨迹指数方法.

Huawei Zhai1, Licheng Cui2, Kemal Polat3

  • 1Information Science and Technology College, Dalian Martime University, Dalian, Liaoning, China.

PeerJ. Computer science
|June 26, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种有效的轨迹索引方法,用于大规模的实时轨迹数据. 这种新方法提高了数据处理和检索速度,在范围和轨迹查询中表现优于现有的方法.

关键词:
核心指数 核心指数核心指数动态轨迹指数 动态轨迹指数主要指数的主要指数.

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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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相关实验视频

Last Updated: Sep 18, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

13.7K
A Protocol for Real-time 3D Single Particle Tracking
10:16

A Protocol for Real-time 3D Single Particle Tracking

Published on: January 3, 2018

15.0K
Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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科学领域:

  • 计算机科学 计算机科学
  • 数据科学数据科学数据科学
  • 地理信息系统 地理信息系统

背景情况:

  • 轨迹数据的索引对于高效的处理和挖矿至关重要.
  • 越来越多的数据规模和检索需求带来了诸如时空局部和数据不平衡等挑战.
  • 现有的索引方法难以处理大规模的实时轨迹数据.

研究的目的:

  • 为大规模实时轨迹数据提出一个高效的索引方法.
  • 为了应对时空局部,数据不平衡和低数据密度的挑战.
  • 为了提高轨迹数据检索效率和准确性.

主要方法:

  • 扩展了HBase的轨迹数据的垂直存储模式.
  • 设计了一个核心索引,并优化了行键设计.
  • 实现了一个动态索引机制,以满足灵活的查询要求.
  • 精细的数据检索流程和数据集映射.

主要成果:

  • 拟议的索引方法在范围检索方面表现出卓越的性能.
  • 该方法在轨道检索准确性和速度方面显著改善.
  • 对比实验证实了动态索引机制的有效性.

结论:

  • 开发的索引方法有效处理大规模的实时轨迹数据.
  • 该方法为改善轨迹数据处理和挖掘提供了一个强大的解决方案.
  • 这种方法为更高效,更准确的轨迹数据分析提供了基础.