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Videos de Conceptos Relacionados

Plastic Deformations01:19

Plastic Deformations

477
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
477
Plastic Deformations01:14

Plastic Deformations

477
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Bacterial Transformation01:33

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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

528
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

491
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Video Experimental Relacionado

Updated: Feb 14, 2026

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Transformer disperso de pirámide deformable para la detección semisupervisada de distracciones del conductor

Qiang Zhao1, Zhichao Yu2, Jiahui Yu2

  • 1School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China.

Sensors (Basel, Switzerland)
|February 13, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio presenta un marco adaptativo semisupervisado para la detección de distracciones del conductor, mejorando significativamente los sistemas de seguridad mediante el uso de datos etiquetados limitados y muestras no etiquetadas para un rendimiento preciso.

Palabras clave:
detección basada en YOLOfusión de características deformablesdetección de distracciones del conductorsistemas de monitorización del conductorsistemas de transporte inteligentesalineación de características multiescaladetección de objetosaprendizaje semisupervisadomarco profesor-alumno

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Área de la Ciencia:

  • Sistemas de Transporte Inteligentes
  • Visión por Computadora
  • Aprendizaje Automático

Sus antecedentes:

  • La atención del conductor es crucial para la seguridad del transporte inteligente.
  • La anotación manual para los modelos de detección de distracciones del conductor es costosa y requiere mucho tiempo.
  • Los modelos existentes tienen dificultades con datos etiquetados limitados.

Objetivo del estudio:

  • Proponer un marco adaptativo semisupervisado para la detección de distracciones del conductor.
  • Mejorar el rendimiento del modelo con datos etiquetados limitados.
  • Mejorar los sistemas de monitorización del conductor en el mundo real.

Principales métodos:

  • Utiliza el aprendizaje profesor-alumno y la fusión de características de pirámide deformable.
  • Incorpora una estrategia adaptativa de optimización de pseudoetiquetas con umbral consciente de la categoría y ponderación de la confianza.
  • Integra un módulo Transformer disperso de pirámide deformable (DPST) en un detector YOLOv11.
  • Emplea destilación de consistencia de características guiada por el profesor.

Principales resultados:

  • Logra una detección de distracciones robusta y escalable utilizando datos etiquetados limitados y datos no etiquetados abundantes.
  • El módulo DPST mejora la percepción detallada de los comportamientos sutiles del conductor.
  • Supera a las bases de referencia totalmente supervisadas en el conjunto de datos Roboflow Distracted Driving Dataset en métricas mAP.
  • Demuestra un equilibrio entre precisión y recuperación.

Conclusiones:

  • El marco propuesto ofrece una solución eficaz para la detección de distracciones del conductor en condiciones de anotación limitadas.
  • Permite sistemas de monitorización del conductor prácticos y escalables.
  • Mitiga el impacto de las pseudoetiquetas ruidosas a través de la destilación de consistencia de características.