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Related Concept Videos

Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

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To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
124
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

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A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by...
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Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Method of Superposition01:20

Method of Superposition

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The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
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Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

160
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

98
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
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Related Experiment Video

Updated: May 10, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Cross-Layer Stream Allocation of mMIMO-OFDM Hybrid Beamforming Video Communications.

You-Ting Chen1, Shu-Ming Tseng1, Yung-Fang Chen2

  • 1Department of Electronic Engineering, National Taipei University of Technology, Taipei 106, Taiwan.

Sensors (Basel, Switzerland)
|April 26, 2025
PubMed
Summary

This study introduces a novel cross-layer scheme for uplink video communication in millimeter-wave (mmWave) systems. It optimizes video quality by maximizing peak signal-to-noise ratio (PSNR), outperforming traditional methods.

Keywords:
broadband accessdata streamdeveloping countrieshybrid beamformingmillimeter-wave (mmWave)multi-user massive multiple-input/multiple-output (MU-Massive MIMO)rate-distortion functionresource allocationvideo distortion

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Video Transmission

Background:

  • Millimeter-wave (mmWave) and massive MIMO technologies are crucial for high-capacity wireless systems.
  • Uplink video communication presents unique challenges compared to downlink scenarios.
  • Existing resource allocation schemes often overlook application-layer quality metrics and multi-stream user needs.

Purpose of the Study:

  • To develop an optimized uplink transmission scheme for mmWave MU-mMIMO video communication.
  • To enhance video quality by directly maximizing PSNR, moving beyond spectral efficiency.
  • To address limitations in prior works by considering multi-data-stream users and uplink optimization.

Main Methods:

  • A cross-layer resource allocation scheme integrating physical layer channel state information (CSI) and application layer rate-distortion (RD) functions.
  • A novel iterative cross-layer dynamic data stream allocation, starting with physical-layer allocation and refining iteratively.
  • Dynamic contention for data streams by users with lower PSNR to achieve balanced resource allocation.

Main Results:

  • The proposed cross-layer scheme achieved 0.4 to 1.14 dB higher PSNR compared to conventional physical-layer schemes for 4-6 users.
  • The scheme demonstrated improved video quality by directly optimizing for PSNR.
  • Increased computational complexity (1.8-2.3x) was observed, with an average of 3.6-5.8 iterations.

Conclusions:

  • The developed cross-layer scheme effectively enhances uplink video quality in mmWave MU-mMIMO systems.
  • Iterative dynamic data stream allocation improves resource distribution and user experience.
  • The framework offers a flexible approach adaptable to various physical-layer allocation methods.