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Related Concept Videos

Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

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When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
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The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
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Kinematic Equations - III01:18

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The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
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Kinematic Equations - I01:26

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When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
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Kinematic Equations for Rotation01:30

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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Linear Approximation in Time Domain01:21

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Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
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Design and Analysis for Fall Detection System Simplification
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An Approach for Fall Prediction Based on Kinematics of Body Key Points Using LSTM.

Bahareh Mobasheri1, Seyed Reza Kamel Tabbakh1, Yahya Forghani1

  • 1Department of Computer Engineering, Mashhad Branch, Islamic Azad University, Mashhad 9187147578, Iran.

International Journal of Environmental Research and Public Health
|November 11, 2022
PubMed
Summary

This study introduces a new fall prediction method using body kinematics and machine learning. The developed models achieved 98% accuracy, promoting adult and elderly health.

Keywords:
LSTMfalls predictionhealth promotionimage processingolder adultswellness

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Area of Science:

  • Gerontology
  • Computer Science
  • Biomedical Engineering

Background:

  • Existing fall prediction methods often rely on wearable sensors or video analysis of body posture and kinematics.
  • Integrating these approaches can enhance the accuracy and reliability of fall detection systems.

Purpose of the Study:

  • To develop and evaluate machine learning models for accurate fall prediction in adults and the elderly.
  • To leverage body kinematics extracted from video data for enhanced fall detection capabilities.

Main Methods:

  • Utilized the UP-Fall Detection dataset, comprising video recordings.
  • Developed three Long-Short-Term Memory (LSTM) network models (4p-SAFE, 5p-SAFE, 6p-SAFE) using coordinates and angles extracted from video sequences.
  • Employed machine learning for analyzing sequential image data from ordinary cameras.

Main Results:

  • Achieved a prediction accuracy of up to 98% with the developed LSTM models.
  • Demonstrated the effectiveness of using body kinematics and machine learning for fall prediction.
  • The models are designed for easy application with standard camera footage.

Conclusions:

  • The proposed integrated approach of body kinematics and machine learning offers a highly accurate method for fall prediction.
  • Implementation of these models can significantly improve the health and wellness of adults and the elderly.
  • The system's reliance on ordinary cameras makes it widely applicable, particularly in aged-care settings.