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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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The Maximum Power Transfer Theorem01:20

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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Boundary Conditions: Lossless Lines01:21

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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.
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The Power Superposition Principle01:19

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Consider a circuit with two sinusoidal voltage sources. Each one influences the circuit independently, and the superposition principle helps us understand the combined effect by adding up the responses from each source.
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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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Link-state-estimation-based transmission power control in wireless body area networks.

Seungku Kim, Doo-Seop Eom

    IEEE Journal of Biomedical and Health Informatics
    |October 11, 2013
    PubMed
    Summary

    This study introduces a new transmission power control protocol for wireless body area networks (WBANs). The protocol enhances sensor node lifetime and link reliability by adapting power based on link states.

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    Area of Science:

    • Biomedical Engineering
    • Wireless Communication Systems
    • Network Protocols

    Background:

    • Wireless Body Area Networks (WBANs) are crucial for remote health monitoring.
    • Sensor node lifetime and link reliability are critical challenges in WBANs.
    • Existing power control protocols often struggle to balance energy efficiency and reliability.

    Purpose of the Study:

    • To propose a novel transmission power control protocol for WBANs.
    • To enhance sensor node longevity and improve link reliability.
    • To address the limitations of current power control mechanisms in WBANs.

    Main Methods:

    • Experimental investigation of link states using Received Signal Strength Indicator (RSSI).
    • Development of a practical transmission power control protocol integrating short- and long-term link-state estimations.
    • Adaptation of transceiver transmission power and targeting of RSSI threshold ranges for energy efficiency and reliability.

    Main Results:

    • The proposed protocol demonstrated an increase in sensor node lifetime by up to 9.86%.
    • Link reliability was enhanced, with packet loss reduced by a maximum of 3.02%.
    • Performance was validated in scenarios involving body posture changes and dynamic body motion.

    Conclusions:

    • The novel transmission power control protocol effectively extends WBAN sensor node lifetime.
    • The protocol significantly improves link reliability in WBANs.
    • This approach offers a practical solution for optimizing WBAN performance.