Jove
Visualize
Contact Us

Related Concept Videos

Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

353
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...
353
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

333
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...
333
Gyroscope01:02

Gyroscope

3.0K
A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
3.0K
Measuring Acceleration Due to Gravity01:12

Measuring Acceleration Due to Gravity

562
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
562

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A Method for Detecting Preliminary Actions During an Actual Karate Kumite Match.

Sensors (Basel, Switzerland)·2025
Same author

Method for Estimating Amount of Saliva Secreted Using a Throat Microphone.

Sensors (Basel, Switzerland)·2025
Same author

A Curiosity Estimation in Storytelling with Picture Books for Children Using Wearable Sensors.

Sensors (Basel, Switzerland)·2024
Same author

Physical Noninvasive Attacks on Photoplethysmogram by Computer Controlled Blood Pressure Cuff.

Sensors (Basel, Switzerland)·2023
Same author

Estimating Scalp Moisture in a Hat Using Wearable Sensors.

Sensors (Basel, Switzerland)·2023
Same author

System for Detecting Learner Stuck in Programming Learning.

Sensors (Basel, Switzerland)·2023
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Video

Updated: Jun 28, 2025

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
07:24

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers

Published on: April 21, 2017

12.5K

KARATECH: A Practice Support System Using an Accelerometer to Reduce the Preliminary Actions of Karate.

Kwangyun Kim1, Shuhei Tsuchida2, Tsutomu Terada1

  • 1Graduate School of Engineering, Kobe University, 1-1 Rokkodai-Cho, Nada-Ku, Kobe 657-8501, Hyogo, Japan.

Sensors (Basel, Switzerland)
|April 13, 2024
PubMed
Summary

This study introduces a system to help karate kumite practitioners reduce pre-actions. The method accurately detects pre-actions in forefist punches, aiding skill improvement.

Keywords:
accelerometerdynamic time warpinghuman motion analysiskaratesports support

More Related Videos

Design and Analysis for Fall Detection System Simplification
08:05

Design and Analysis for Fall Detection System Simplification

Published on: April 6, 2020

10.7K
A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
06:58

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study

Published on: November 6, 2015

9.5K

Related Experiment Videos

Last Updated: Jun 28, 2025

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
07:24

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers

Published on: April 21, 2017

12.5K
Design and Analysis for Fall Detection System Simplification
08:05

Design and Analysis for Fall Detection System Simplification

Published on: April 6, 2020

10.7K
A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
06:58

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study

Published on: November 6, 2015

9.5K

Area of Science:

  • Sports Science
  • Biomechanics
  • Motor Control

Background:

  • Kumite sparring involves offensive and defensive techniques, with pre-actions potentially revealing technique timing to opponents.
  • Reducing pre-actions is crucial for improving kumite performance, but difficult for beginners and intermediate practitioners to identify and correct.
  • Existing methods lack effective tools for practitioners to understand and reduce pre-actions.

Purpose of the Study:

  • To develop a practice support system for karate practitioners to identify and reduce pre-actions in kumite.
  • To enable beginners and intermediate players to better understand their pre-action tendencies.
  • To improve overall kumite performance by minimizing detectable pre-actions.

Main Methods:

  • Proposed a method to estimate the presence or absence of pre-actions in forefist punches using acceleration data.
  • Compared acceleration data of punches against a dataset of punches without pre-actions to detect anomalies.
  • Developed KARATECH, a system visualizing pre-action presence via video and graphs.

Main Results:

  • The proposed method achieved 86% accuracy in estimating the presence or absence of pre-actions in forefist punches.
  • The KARATECH system successfully demonstrated the presence or absence of pre-actions to users.
  • Karate practitioners using KARATECH showed a reduced rate of pre-actions compared to a control group.

Conclusions:

  • The developed method and KARATECH system are effective in helping karate practitioners reduce pre-actions.
  • This approach offers a novel way to provide objective feedback for skill refinement in kumite.
  • Further research can explore application to other techniques and skill levels in martial arts.