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相关概念视频

Types Of Transformers01:16

Types Of Transformers

987
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
987
The Ideal Transformer01:26

The Ideal Transformer

407
In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's...
407
Transformers in Distribution System01:27

Transformers in Distribution System

105
Transformers in distribution systems can be broadly categorized into distribution substation transformers and other distribution transformers. They are crucial for stepping down high transmission voltages to levels suitable for distribution and end-user applications.
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
105
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

443
The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The...
443
Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

162
In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
162
Three-Winding Transformers01:19

Three-Winding Transformers

238
Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
238

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相关实验视频

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Cross-Modal Multivariate Pattern Analysis
13:51

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

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动态MDETR:用于视觉接地的动态多模式变压器解码器.

Fengyuan Shi, Ruopeng Gao, Weilin Huang

    IEEE transactions on pattern analysis and machine intelligence
    |October 27, 2023
    PubMed
    概括
    此摘要是机器生成的。

    我们介绍了Dynamic MDETR,这是一款用于高效视觉接地的新型多式联络变压器. 这种新型号通过动态采样图像特征来显著减少计算,以更少的处理能力实现更高的准确性.

    更多相关视频

    A Novel Experimental and Analytical Approach to the Multimodal Neural Decoding of Intent During Social Interaction in Freely-behaving Human Infants
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    科学领域:

    • 计算机视觉 计算机视觉
    • 机器学习 机器学习
    • 人工智能的人工智能

    背景情况:

    • 多式变压器是有效的视觉接地,对准图像和文本数据.
    • 现有的仅为编码器的框架,如TransVG,由于自我注意的二次时间复杂性,面临着计算挑战.
    • 图像中的高空间冗余性为优化提供了机会.

    研究的目的:

    • 开发一个计算效率高的多式变压器,用于视觉接地.
    • 通过减少计算开销来解决现有的仅编码器框架的局限性.
    • 为了提高视觉接地任务的准确性和效率权衡.

    主要方法:

    • 提出了一个动态多模式检测变压器 (动态MDETR) 架构,将接地解成编码和解码阶段.
    • 设计了一个动态多模式变压器解码器,使用2D自适应采样模块和文本引导解码模块.
    • 解码器自适应地取样信息图像补丁,并通过图像和文本特征之间的交叉注意力来改进对象本地化.

    主要成果:

    • 动态MDETR实现了具有竞争力的精度-精度权衡,将计算成本降低了约44%的GFLOP,解码器中的特征点仅为9%.
    • 性能优于TransVG (ResNet-101),使用较少的参数 (ResNet-50),额外的边际计算成本.
    • 开发了第一个单阶段的CLIP授权的视觉接地框架,实现了最先进的性能并展示了强大的概括性.

    结论:

    • 拟议的动态MDETR可显著提高视觉接地计算效率,而不会牺牲准确性.
    • 动态解码器有效地利用图像稀疏性来加速接地过程.
    • 该框架显示出有希望的可扩展性和通用化能力,设置了一个新的最先进的状态.