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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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El más cercano el más lejano el más ancho

Kenneth Lange1

  • 1Departments of Computational Medicine, Human Genetics, and Statistics, University of California, Los Angeles, CA 90095, USA.

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|September 2, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio presenta los algoritmos de ascenso de gradiente proyectado de Frank-Wolfe para encontrar el diámetro y el punto más lejano en conjuntos convexos. Un método de homotopía mejora el ascenso proyectado del gradiente

Palabras clave:
Frank-Wolfe también.conjunto convexoel diámetropunto más lejanohomotopíaAscenso proyectado de la pendiente

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Área de la Ciencia:

  • Algoritmos de optimización
  • Geometría computacional
  • Análisis convexo

Sus antecedentes:

  • Determinar el diámetro y el punto más lejano en conjuntos compactos convexos son problemas fundamentales en la optimización.
  • Los algoritmos existentes como Frank-Wolfe y el ascenso de gradiente proyectado pueden quedar atrapados en máximos locales para problemas no convexos.

Objetivo del estudio:

  • Proponer y probar nuevos algoritmos para calcular el diámetro y el punto más lejano de conjuntos compactos convexos.
  • Investigar la eficacia de un método de homotopía para superar las limitaciones máximas locales de los algoritmos basados en gradientes.

Principales métodos:

  • Construcción y prueba de algoritmos de ascenso de gradiente proyectados de Frank-Wolfe.
  • Desarrollo y aplicación de un método de homotopía para deformar gradualmente una bola en el conjunto objetivo.
  • Cálculo de las funciones de soporte para las intersecciones de conos y bolas convexas y para conjuntos de subniveles convexos.

Principales resultados:

  • Los algoritmos de Frank-Wolfe y de ascenso de gradiente proyectado demuestran un rendimiento comparable en conjuntos compactos convexos probados.
  • El algoritmo de Frank-Wolfe muestra una mayor fiabilidad cuando no se emplea el método de homotopía.
  • El método de homotopía mejora el algoritmo de ascenso de gradiente proyectado, lo que le permite recuperarse de las fallas.

Conclusiones:

  • Tanto Frank-Wolfe como el ascenso del gradiente proyectado son viables para el diámetro y los cálculos del punto más lejano.
  • Los métodos de homotopía ofrecen una mejora significativa para el ascenso proyectado del gradiente, aumentando su robustez.
  • El estudio contribuye con enfoques algorítmicos refinados para problemas de optimización geométrica.