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Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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A silo with a cylindrical base, flat bottom, and hemispherical roof is a common design in agricultural and industrial storage due to its structural efficiency and ease of construction. Optimizing its dimensions to maximize storage capacity for a given amount of material—i.e., a fixed surface area—is a classic problem in applied calculus and engineering design. The key parameters are the radius r of the base and the height h of the cylindrical section.The total volume of the silo is obtained by...

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Related Experiment Video

Updated: Jul 7, 2026

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
11:41

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation

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Effect of formulations over a Periodic Capacitated Vehicle Routing Problem with multiple depots, heterogeneous fleet,

Alejandro Arenas-Vasco1, Juan Carlos Rivera1, Maria Gulnara Baldoquín2

  • 1Mathematical Modeling Research Group, Escuela de Ciencias Aplicadas e Ingeniería, Universidad EAFIT, Medellín, Antioquia, Colombia.

Plos One
|October 3, 2024
PubMed
Summary

This study introduces two novel formulations for the Periodic Vehicle Routing Problem (PVRP) to address complex logistics in the vending machine industry. These new models enhance efficiency for routing problems with time windows, diverse fleets, and multiple depots.

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Area of Science:

  • Operations Research
  • Logistics Management
  • Combinatorial Optimization

Background:

  • The Periodic Vehicle Routing Problem (PVRP) is a complex logistical challenge.
  • Existing PVRP models often lack the specificity required for real-world applications like the vending machine industry.

Purpose of the Study:

  • To introduce two novel mathematical formulations for the PVRP.
  • To address a specific variant of PVRP incorporating time windows, a heterogeneous fleet, and multiple depots.
  • To cater to the unique demands of the vending machine industry in Medellín, Colombia.

Main Methods:

  • Development of two distinct PVRP formulations differing in flow variable usage.
  • Analysis of PVRP variants with time windows, heterogeneous fleets, and multiple depots.
  • Empirical experiments using the GUROBI solver to evaluate formulation performance.

Main Results:

  • The proposed PVRP variant, considering all specified attributes and restrictions, is novel.
  • The two formulations exhibit distinct impacts on the GUROBI solver's performance.
  • The study highlights the computational challenges associated with increased customer numbers.

Conclusions:

  • The introduced formulations offer a new paradigm for solving multifaceted PVRPs.
  • Problem-specific adaptations are crucial for optimizing complex routing scenarios.
  • This research provides valuable insights for practical applications in logistics and operations research.