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Related Concept Videos

Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Maximum Power Flow and Line Loadability01:23

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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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Reducing Line Loss01:18

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
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Related Experiment Video

Updated: Jan 11, 2026

Quasi-light Storage for Optical Data Packets
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Crosstalk-aware dynamic bandwidth allocation algorithm for confidential lightpath protection in next-generation

Liyazhou Hu, Zihao Lin, Jintao Wang

    Optics Express
    |November 11, 2025
    PubMed
    Summary

    This study introduces a novel crosstalk-aware dynamic bandwidth allocation (CA-DBA) algorithm for Time and Wavelength Division Multiplexed Passive Optical Networks (TWDM-PON). The CA-DBA algorithm effectively mitigates crosstalk attacks, ensuring secure data transmission for confidential lightpaths.

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    Area of Science:

    • Telecommunications Engineering
    • Network Security
    • Optical Networks

    Background:

    • Time and Wavelength Division Multiplexed Passive Optical Networks (TWDM-PON) are crucial for B5G applications, offering high capacity.
    • Confidential Lightpaths (CLPs) in TWDM-PON are vulnerable to crosstalk attacks, leading to data eavesdropping and service disruption.
    • Crosstalk attacks in TWDM-PON can propagate undetected due to the lack of optical-electrical-optical conversion, causing widespread information leakage.

    Purpose of the Study:

    • To develop a novel crosstalk-aware dynamic bandwidth allocation (CA-DBA) algorithm for TWDM-PON.
    • To model and understand the propagation of crosstalk attacks in TWDM-PON.
    • To propose a robust security mechanism against crosstalk attacks on CLPs.

    Main Methods:

    • Modeling the generation and propagation of two types of crosstalk attacks.
    • Utilizing Graph Neural Network (GNN) models to identify crosstalk attack probabilities.
    • Implementing a heuristic algorithm with three differentiated polling schemes: security-priority, time-priority, and time-efficient.

    Main Results:

    • The security-priority and time-efficient schemes achieved 0% leakage risk with up to 100% detection accuracy using the ChebConv model.
    • The time-priority scheme, while improving time delay by 48.04%, still left at least 6% of links at high leakage risk.
    • The proposed CA-DBA algorithm effectively mitigates crosstalk attacks in TWDM-PON.

    Conclusions:

    • The developed CA-DBA algorithm provides effective mitigation against crosstalk attacks in TWDM-PON.
    • The GNN-based approach offers high accuracy in identifying attack probabilities.
    • Differentiated polling schemes allow balancing security and performance requirements based on application needs.