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相关概念视频

Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

116
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
116
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

78
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
78
Structural Classification of Joints01:20

Structural Classification of Joints

3.5K
Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
3.5K
Region of Convergence01:17

Region of Convergence

488
The z-transform is a powerful mathematical tool used in the analysis of discrete-time signals and systems. It is a crucial tool in the analysis of discrete-time systems, but its convergence is limited to specific values of the complex variable z. This range of values, known as the Region of Convergence (ROC), is fundamental in determining the behavior and stability of a system or signal. The ROC defines the region in the complex plane where the z-transform converges, which can take various...
488
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

68
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
68
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

239
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
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相关实验视频

Updated: Jul 23, 2025

Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment
08:25

Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment

Published on: May 7, 2019

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具有结构一致性的上下文意识的提案-边界网络,用于视听事件本地化.

Hao Wang, Zheng-Jun Zha, Liang Li

    IEEE transactions on neural networks and learning systems
    |July 19, 2023
    PubMed
    概括

    这项研究引入了一个新的上下文意识的提案边界 (CAPB) 网络,用于视听事件本地化. 通过编码事件提案和边界,CAPB网络提高了准确性,优于现有的方法.

    科学领域:

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

    背景情况:

    • 视听事件本地化需要识别在视频中看到和听到的事件.
    • 现有的方法往往忽视事件建议和边界,只关注细分级别的特征.
    • 这种限制阻碍了视频序列中事件的准确定位.

    研究的目的:

    • 为改进视听活动本地化提供一个全新的上下文意识的提案边界 (CAPB) 网络.
    • 通过结合事件提案和边界信息来解决细分级特征编码的局限性.
    • 增强对时间关系和结构一致性的理解,以便更准确地检测事件.

    主要方法:

    • 专门为视听活动本地化开发了一个上下文意识的提案边界 (CAPB) 网络.
    • 引入了局部-全球上下文编码器 (LGCE) 来汇总视觉,音频,事件建议和边界的时间上下文.
    • 通过编码的提案和边界表示,提高了分段之间的结构一致性.

    主要成果:

    • 拟议的CAPB网络有效地利用了背景信息和结构一致性.
    • 实现了上下文感知,事件一致和跨模式表示,以实现精确的本地化.
    • 与最先进的方法相比,在视听活动 (AVE) 数据集上表现出卓越的性能.

    更多相关视频

    Author Spotlight: Enhancement of Salient Object Detection for Smart Grid Applications
    03:31

    Author Spotlight: Enhancement of Salient Object Detection for Smart Grid Applications

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    A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers

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    相关实验视频

    Last Updated: Jul 23, 2025

    Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment
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    Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment

    Published on: May 7, 2019

    9.0K
    Author Spotlight: Enhancement of Salient Object Detection for Smart Grid Applications
    03:31

    Author Spotlight: Enhancement of Salient Object Detection for Smart Grid Applications

    Published on: December 15, 2023

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    A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
    12:39

    A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers

    Published on: January 18, 2020

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    结论:

    • CAPB网络代表了在视听活动本地化方面取得的重大进展.
    • 将提案级和边界特征与局部-全球上下文编码相结合对于准确性至关重要.
    • 该方法显示出对监督和跨模式本地化任务的巨大潜力.