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相关概念视频

Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

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Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least...
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Constraints and Statical Determinacy01:26

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In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
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Segregation in Fresh Concrete01:16

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Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
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Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
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在隔离模型中的流动性限制.

Daniele Gambetta1,2, Giovanni Mauro3,4,5, Luca Pappalardo6

  • 1Institute of Information Science and Technologies, National Research Council (ISTI-CNR), Pisa, Italy. daniele.gambetta@phd.unipi.it.

Scientific reports
|July 26, 2023
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的城市隔离模型,该模型具有移动性限制. 结果显示,由于代理物运动模式,分离率较低,融合速度较慢.

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科学领域:

  • 城市研究是城市研究.
  • 计算社会科学 计算社会科学
  • 基于代理人的建模.

背景情况:

  • 原始的谢林模型是研究城市隔离的一个基本工具.
  • 现有的改进还没有纳入现实的人类移动模式.
  • 人类的移动性往往表现出对较短距离和更密集位置的偏好.

研究的目的:

  • 提出和分析一个以代理为基础的城市隔离模型,包括移动限制.
  • 调查将现实的移动模式纳入如何影响隔离动态和融合.
  • 为了提供一个更现实的模拟城市代理人运动及其对隔离的影响.

主要方法:

  • 开发一种基于新型剂的分离模型,将距离和位置与代理物运动相关性结合起来.
  • 模拟结果的比较,从移动性受限制的模型与原来的谢林模型.
  • 分析代理的运动模式,特别是"不快乐"的代理,以及它们对隔离水平和融合时间的影响.

主要成果:

  • 与原来的谢林模型相比,受限移动的模型显示了较低的整体隔离水平.
  • 在移动性受限制的模型中,趋于稳定状态的时间更长.
  • 一些持续不满意的少数派代理人集中移动被确定为长期融合和减少隔离的关键因素.

结论:

  • 流动性限制显著改变了城市隔离的动态,导致隔离减少,但稳定速度较慢.
  • 特定代理人群的移动,特别是不满意的少数代理人,在模型结果中起着至关重要的作用.
  • 纳入现实的流动性限制为理解和解决城市隔离提供了更准确的表征.