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相关概念视频

Neural Circuits01:25

Neural Circuits

1.3K
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
1.3K
Deconvolution01:20

Deconvolution

180
Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
180
Convolution Properties II01:17

Convolution Properties II

224
The important convolution properties include width, area, differentiation, and integration properties.
The width property indicates that if the durations of input signals are T1 and T2, then the width of the output response equals the sum of both durations, irrespective of the shapes of the two functions. For instance, convolving two rectangular pulses with durations of 2 seconds and 1 second results in a function with a width of 3 seconds.
The area property asserts that the area under the...
224
Convolution Properties I01:20

Convolution Properties I

170
Convolution computations can be simplified by utilizing their inherent properties.
The commutative property reveals that the input and the impulse response of an LTI (Linear Time-Invariant) system can be interchanged without affecting the output:
170
Convolution: Math, Graphics, and Discrete Signals01:24

Convolution: Math, Graphics, and Discrete Signals

282
In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
To simplify the convolution integral, it is assumed that both the input signal and impulse response are zero for negative time values. The graphical convolution process...
282
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

96
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
96

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相关实验视频

Updated: Jul 16, 2025

Time-Lapse Imaging of Neuronal Arborization using Sparse Adeno-Associated Virus Labeling of Genetically Targeted Retinal Cell Populations
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Time-Lapse Imaging of Neuronal Arborization using Sparse Adeno-Associated Virus Labeling of Genetically Targeted Retinal Cell Populations

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使用卷积神经网络推断凝聚时间和变异年龄.

Juba Nait Saada1, Zoi Tsangalidou1, Miriam Stricker1

  • 1Department of Statistics, University of Oxford, Oxford, UK.

Molecular biology and evolution
|September 22, 2023
PubMed
概括

我们开发了CoalNN,这是一种新的深度学习方法,用于准确估计基因组变异的年龄和最近共同祖先 (TMRCA) 的时间. 这种方法通过提供对人类人口统计历史和选择压力的精确见解来增强人口遗传分析.

科学领域:

  • 人口遗传学 人口遗传学
  • 基因组学就是基因组学.
  • 机器学习 机器学习

背景情况:

  • 准确推断时间到最近的共同祖先 (TMRCA) 和基因组变异年龄对于人口遗传学至关重要.
  • 现有的基于模型的方法在某些场景中存在局限性.

研究的目的:

  • 开发一种新的,准确的,可适应的方法来推断双对TMRCAs和等位基因年龄.
  • 将这种方法应用于大规模的基因组数据,以深入了解人口历史和选择.

主要方法:

  • 开发了CoalNN,一种使用模拟训练的卷积神经网络的无概率方法.
  • 利用转移学习来调整模型以适应不同的人口参数.
  • 将CoalNN应用于1000个基因组项目的2,504个样本,分析了约8000万个变异.

主要成果:

  • 在模拟中,CoalNN与基于模型的现有方法匹配或超过TMRCA和等位基年龄预测的准确性.
  • 在26个人口中推断的变异年龄显示出显著的差异,反映了人口历史和负面选择.
  • 产生负选择特征的全基因组注释,改善复杂特征的遗传分析.

结论:

关键词:
代基因年龄 代基因年龄凝聚时间 凝聚时间遗传性 遗传性 遗传性机器学习是机器学习.自然选择自然选择

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  • 无概率的模拟训练模型对于在大型基因组数据集中推断基因谱系属性是有效的.
  • CoalNN提供了有关人口人口统计和进化过程的宝贵见解.
  • 开发的注释增强了对遗传性和选择对复杂特征的影响的研究.