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相关概念视频

Distance Measurements by Taping01:18

Distance Measurements by Taping

Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
Errors in Global Positioning System01:26

Errors in Global Positioning System

Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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...
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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

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 served as...

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相关实验视频

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A Protocol for Real-time 3D Single Particle Tracking
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在基于Wi-Fi的室内定位中进行短暂的学习.

Feng Xie1, Soi Hoi Lam2, Ming Xie3

  • 1School of Information Science and Technology, Sanda University, Shanghai 201209, China.

Biomimetics (Basel, Switzerland)
|September 27, 2024
PubMed
概括

通过meta-learning进行少数拍摄的学习,可以提高Wi-Fi室内定位的准确性,特别是在数据有限的情况下. 这种方法增强了对新型室内环境的卷积神经网络 (CNN) 概括.

关键词:
代数等号相似性 代数等号相似性只有少数样本的学习.几次射击的学习学习室内定位装置 室内定位装置有限的标签数据数据有限.这就是meta-learning.

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Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Author Spotlight: Addressing Technical and Subjective Challenges in Measuring Classroom Attention
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相关实验视频

Last Updated: Jul 11, 2026

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Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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科学领域:

  • 计算机科学 计算机科学
  • 机器学习 机器学习
  • 信号处理 信号处理

背景情况:

  • 室内定位系统经常在有限的标记数据下扎.
  • 卷积神经网络 (CNN) 是有效的,但需要大量的数据.
  • 超级学习为数据稀缺的场景提供了解决方案.

研究的目的:

  • 调查少量射击学习与基于Wi-Fi的室内定位的元学习相结合的有效性.
  • 在数据有限的环境中提高定位系统的准确性和效率.
  • 将基础CNN模型与元学习方法的性能进行比较.

主要方法:

  • 在meta-learning框架内,利用了一些射击学习任务 (例如,N-shot).
  • 应用CNN用于Wi-Fi信号处理和室内定位.
  • 在不同的数据可用性和新型类别的各种场景中评估模型性能.
  • 在数据预处理和元学习阶段,采用了以等号相似度 (FCS) 进行过.

主要成果:

  • 根据FCS后每类 (K) 的数据样本,基CNN的准确性差异很大.
  • 超级学习在有限样本的场景中表现出可接受的表现,特别是在新课程中.
  • 在20个样本/班级中,基CNN达到0.80的预训练准确度;在新课程中,元学习 (3-way 1-shot) 达到0.78.

结论:

  • 通过meta-learning进行少数拍摄的学习,有效地解决了Wi-Fi室内定位中的数据限制.
  • 拟议的方法增强了对新的,未见的室内环境的模型概括性.
  • 超级学习提供了一种可行的策略,用于提高定位准确性,当标记数据稀缺时.