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Related Concept Videos

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...
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...
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,...
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,...
Orthogonal Trajectories01:26

Orthogonal Trajectories

Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
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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Related Experiment Videos

Adaptive square-shaped trajectory-based service location protocol in wireless sensor networks.

Hwa-Jung Lim1, Joa-Hyoung Lee, Heon-Guil Lee

  • 1Department of Computer Science and Engineering, Kangwon National University, Chuncheon Gangwondo, 200-701, Korea. jinnie4u@kangwon.ac.kr

Sensors (Basel, Switzerland)
|March 9, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces an adaptive square-shaped trajectory (ASST) method for wireless sensor networks. ASST ensures load scalability by dynamically adjusting trajectories to distribute high query loads efficiently.

Keywords:
data replicationload scalabilityrobustservice locationtrajectory

Related Experiment Videos

Area of Science:

  • Computer Science
  • Network Engineering
  • Distributed Systems

Background:

  • Wireless sensor networks (WSNs) face challenges in load scalability due to uneven query distribution.
  • Efficient service location is crucial for maintaining network performance under varying loads.

Purpose of the Study:

  • To propose an adaptive square-shaped trajectory (ASST)-based service location method.
  • To enhance load scalability and distribute high query loads in WSNs.

Main Methods:

  • A hash function computes a target point for trajectory establishment.
  • The trajectory is dynamically adjusted in width and size based on query volume.
  • Sensor nodes on the trajectory adapt to its changing shape.

Main Results:

  • The ASST method ensures that the number of sensor nodes on the trajectory scales with the trajectory's shape.
  • High query loads are effectively distributed around the 'hot spot' areas.
  • Improved load balancing and scalability in WSNs.

Conclusions:

  • The ASST-based service location method provides a scalable solution for WSNs.
  • Dynamic trajectory adjustment is key to managing fluctuating query loads.
  • This approach enhances the overall efficiency and robustness of WSNs.