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Related Concept Videos

Zones of Protection01:16

Zones of Protection

In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
Network Function of a Circuit01:25

Network Function of a Circuit

Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...

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Related Experiment Video

Updated: Jun 22, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Domain border node pair based network partition for sub-path protection in optical networks.

Donghui Gao, Hanyi Zhang, Zhiyu Zhou

    Optics Express
    |June 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Domain border node (DBN) failures in optical networks are addressed by the DBN-Pair based Network Partition (DPNP) approach. DPNP improves connection blocking, resource efficiency, and recovery time scalability compared to prior methods.

    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Quasi-light Storage for Optical Data Packets
    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    Area of Science:

    • Optical network resilience and protection mechanisms.
    • Network performance optimization and resource management.

    Background:

    • Real-time services in optical networks require fast failure recovery.
    • Sub-path protection offers scalability but has provisioning latency and lacks domain border node (DBN) protection.
    • Existing methods fail to adequately address DBN failures, impacting network reliability.

    Purpose of the Study:

    • To introduce a novel approach for protecting optical networks against domain border node (DBN) failures.
    • To enhance connection provisioning speed and overall network efficiency.
    • To provide a scalable and efficient protection mechanism for optical networks.

    Main Methods:

    • Development of the DBN-Pair based Network Partition (DPNP) strategy.
    • Formulation of an Integer Linear Program (ILP) for network partitioning.
    • Implementation of the Sub-Path InCorporatE (SPICE) algorithm for DBN failure protection.

    Main Results:

    • DPNP effectively addresses DBN failures across all routing scenarios.
    • Demonstrated significant improvements over previous methods in connection blocking ratio.
    • Showcased enhanced resource utilization efficiency and scalable failure recovery times.

    Conclusions:

    • DPNP provides a superior solution for optical network protection, particularly for DBN failures.
    • The proposed method overcomes the limitations of sub-path protection regarding latency and DBN fault tolerance.
    • DPNP offers a scalable and efficient approach to improving optical network reliability and performance.