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相关概念视频

Differential Relays01:20

Differential Relays

268
Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
268
Directional Relays01:25

Directional Relays

204
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
204
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

135
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:
135
Communication01:28

Communication

7.7K
Sharing information, concepts, and emotions to foster mutual understanding is communication. The sender, recipient, and transaction must be considered in this manner. The sender is the person who shares the message, the recipient is the person who receives and understands the message, and the transaction is the method used to deliver the message and the variables that affect the communication's context and surroundings. The nurse-client connection is built on therapeutic communication.
7.7K
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

138
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...
138
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

819
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
819

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相关实验视频

Updated: Sep 18, 2025

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization
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Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization

Published on: November 26, 2019

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通过全双流用户中继进行秘密通信.

Jong Yeol Ryu1, Jung Hoon Lee2

  • 1Department of AI Information Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea.

Sensors (Basel, Switzerland)
|June 27, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种用于秘密通信系统的新型用户中继方案. 该方法最大限度地利用全双重解码和转发中继来实现隐蔽数据速率,同时保持对窃听者的安全性.

关键词:
秘密通讯是一种隐蔽的通讯.隐藏的利率是一个隐藏的利率.电力分配权力分配权力分配权取消信号取消的信号用户转接使用者转接.

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相关实验视频

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Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization

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Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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科学领域:

  • 信息理论 信息理论
  • 无线通信无线通信
  • 网络安全 网络安全

背景情况:

  • 秘密通讯系统的目的是传输信息,以免被窃听者发现.
  • 全双倍继电器可以提高通信效率,但会带来安全挑战.
  • 现有的计划往往难以平衡高数据速率与保证隐蔽性.

研究的目的:

  • 开发一个用户继电方案,用于使用全双重解码和转发继电器进行秘密通信.
  • 为了最大限度地提高隐蔽率,同时满足严格的隐蔽要求.
  • 确保数据传输对合法用户和秘密接收者来说都是可靠的.

主要方法:

  • 一个系统模型涉及一个发射器 (爱丽丝),一个常规用户 (卡罗尔),一个秘密用户 (勃) 和一个监狱长 (威利).
  • 采用全双流解码和转发继电器,连续取消干扰.
  • 利用相位转向和功率分配用于隐蔽数据传输.
  • 实施一种新的取消技术,以消除监狱长的秘密数据.

主要成果:

  • 拟议的方案有效地最大限度地提高了隐蔽率.
  • 通过将监狱长的检测概率保持在特定值以下来保持隐蔽性.
  • 通过优化传输实现了监狱长对秘密数据的完美取消.

结论:

  • 用户转接方案显著提高了秘密通信的性能.
  • 整合全双重中继与先进的信号处理技术,为安全的无线传输提供了强大的解决方案.
  • 这种方法提供了一个实用的方法,在潜在的窃听者面前实现高隐蔽率.