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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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PD Controller: Design01:26

PD Controller: Design

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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

221
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

198
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

145
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
145
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

116
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Related Experiment Video

Updated: Sep 6, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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P4DM: Measure the Link Delay with P4.

Amir Al Sadi1, Davide Berardi1, Franco Callegati1

  • 1Department of Computer Science and Engineering, University of Bologna, 40136 Bologna, Italy.

Sensors (Basel, Switzerland)
|June 24, 2022
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Summary

This study introduces a novel P4 data plane programming method for precise network link delay measurement. This approach offers accurate, reliable transit time data, even in congested multi-hop networks.

Keywords:
Link Delay MeasurementP4SDN

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Related Experiment Videos

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Area of Science:

  • Computer Science
  • Networking

Background:

  • Accurate network performance measures, particularly link delay, are crucial for effective network management.
  • Measuring link delay accurately, especially across multi-hop paths, presents a significant challenge in classical networking.
  • Existing measurement tools often lack accuracy and reliability, particularly under network congestion.

Purpose of the Study:

  • To propose an improved method for accurate and reliable measurement of network link transit time.
  • To leverage the P4 data plane programming language for enhanced network performance monitoring.
  • To address the limitations of conventional tools in measuring delay in complex network scenarios.

Main Methods:

  • Developed a novel solution utilizing the P4 data plane programming language.
  • Implemented lightweight probe packets generated by hosts and processed by P4 programs in switches.
  • Designed a system for ad-hoc forging and processing of probe packets at link edges.

Main Results:

  • The proposed P4-based approach provides accurate and reliable link transit time measurements.
  • The method demonstrates effectiveness in multi-hop network paths, outperforming conventional tools like ping.
  • Measurements remain robust and minimally influenced by packet loss, even during network overload.

Conclusions:

  • The P4 data plane offers a powerful platform for accurate network delay measurement.
  • This new methodology significantly improves upon existing network performance monitoring techniques.
  • The solution is robust and reliable for managing congested and complex multi-hop networks.