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相关概念视频

Rolling Resistance: Problem Solving01:17

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Sequence Networks of Rotating Machines01:24

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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
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Flat belts are crucial in many industrial applications as they help transmit power from one pulley to another. The concept of forces and moments is used to determine the maximum moment on a pulley. For instance, consider a flat belt that wraps around two pulleys, A and B, with radii of 30 cm and 10 cm, respectively. The angle between the belt and the horizontal is 20 degrees at the pulleys. As pulley B rotates clockwise and drives pulley A, tension T2 is caused at one end of the belt, while...
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
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学习功能 嵌入 Refiner 解决车辆路由问题

Jingwen Li, Yining Ma, Zhiguang Cao

    IEEE transactions on neural networks and learning systems
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    概括
    此摘要是机器生成的。

    本研究介绍了一个特征嵌入精炼器 (FER),用于改进神经网络,解决车辆路由问题 (VRPs). 通过完善特征嵌入和概率分布,FER增强了解决方案搜索,从而提高了性能.

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    科学领域:

    • 运营研究 运营研究
    • 人工智能的人工智能
    • 计算机科学 计算机科学

    背景情况:

    • 编码器-解码器模型对于车辆路由问题 (VRPs) 是常见的,但由于确定性嵌入和分布,在解决方案搜索方面存在困难.
    • 现有的VRP深度学习方法缺乏灵活性,难以有效地探索各种解决方案.

    研究的目的:

    • 引入一种新的特征嵌入精炼器 (FER),以增强现有的VRP编码器-解码器深度模型.
    • 通过完善特征嵌入和概率分布,提高神经构造方法的搜索能力.

    主要方法:

    • 提出了一种通用的编码器-精炼器-解码器结构,其中精炼器网络将Gated Recurrent Units (GRU) 与累积图注意 (AGA) 和Gated Nonlinear (GNL) 层相结合.
    • AGA层从历史解决方案中提取拓信息,而GNL层使用池嵌入器来改进编码器嵌入.
    • 应用FER到注意力模型 (AM) 和多个优点 (POMO) 的政策优化,用于旅行销售员问题 (TSP) 和容量VRP (CVRP).

    主要成果:

    • FER使功能嵌入的代改进能够实现更广泛的搜索范围和动态更新的概率分布,以便进行更多样化的探索.
    • 实验表明,与原始模型相比,FER增强方法实现了较小的差距和更好的概括性.
    • 基于FER的方法显示了与TSP和CVRP的最先进的神经改进方法相比具有竞争力的性能.

    结论:

    • 拟议的FER通过增强解决方案搜索,显著提高了VRP现有的神经构建方法的性能.
    • FER提供了一个模型不可知的方法,改善复杂的路由问题的搜索范围和解决方案的多样性.
    • 这种方法为深度学习应用在VRP和TSP等组合优化问题中提供了宝贵的进步.