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2 results

  • 12 - Age of Information in Practice

    • By
  • Edited by Nikolaos Pappas, Linköpings Universitet, Sweden, Mohamed A. Abd-Elmagid, Virginia Tech, Bo Zhou, Nanjing University of Aeronautics and Astronautics, China, Walid Saad, Virginia Tech, Harpreet S. Dhillon, Virginia Tech
  • Book:
    Age of Information
    Published online:
    02 February 2023
    Print publication:
    09 February 2023, pp 297-326

  • Summary

    While age of Information (AoI) has gained importance as a metric characterizing the freshness of information in information-update systems and time-critical applications, most previous studies on AoI have been theoretical. In this chapter, we compile a set of recent works reporting AoI measurements in real-life networks and experimental testbeds, and investigating practical issues such assynchronization, the role of various transport layer protocols, congestion control mechanisms, application of machine learning for adaptation to network conditions, and device-related bottlenecks such as limited processing power.

  • A TCP/IP-based remote control system for yard cranes in a port container terminal

  • J. Y. Kim
  • Journal:
    Robotica / Volume 24 / Issue 5 / September 2006
    Published online by Cambridge University Press:
    17 February 2006, pp. 613-620

  • If one operator in a remote operating room can operate 4 ∼ 5 cranes remotely, which are yard cranes for container loading/unloading in a port container terminal, the port loading/unloading efficiency will dramatically be improved through productivity increase, cost reduction, and so on. This study presents a remote crane control system for container loading/unloading yard cranes of port container terminals. First, a wireless web-based video and audio transmission system to transmit the images and the sounds of a craneyard is designed by using 3 web cameras and a microphone. Next, a TCP/IP-based remote crane control system is presented on the basis of the delay performance simulations of TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) for real-time remote control. The simulation results show that TCP is more advantageous for remote crane control on a local network.