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Search: WFRF:(Zhao S.) > Book chapter

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1.
  • Falconer, D., et al. (author)
  • New Air-interface Technologies and Deployment Concepts
  • 2006
  • In: Technologies for the Wireless Future: Wireless World Research Forum (WWRF). - Chichester, UK : John Wiley & Sons. - 0470029056 - 9780470029053 ; , s. 131-226
  • Book chapter (other academic/artistic)
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4.
  • Ren, Qilin, et al. (author)
  • Modeling the choice of shared micro-mobility services using XGBoost machine learning
  • 2023
  • In: 26th AGILE Conference on Geographic Information Science : Spatial data for design - Spatial data for design. ; 4:4
  • Book chapter (peer-reviewed)abstract
    • In recent years, shared micro-mobility services (e.g., bikes, e-bikes, and e-scooters) have been popularized at a rapid pace worldwide, which provide more choices for people’s short and medium-distance travel. Accurately modeling the choice of these shared micro-mobility services is important for their regulation and management. However, little attention has been paid to modeling their choice, especially with machine learning. In this paper, we explore the potential of the XGBoost model to model the three types of shared micro-mobility services, including docked bike, docked e-bike, and dockless e-scooter, in Zurich, Switzerland. The model achieves an accuracy of 72.6%. Moreover, the permutation feature importance is implemented to interpret the model prediction. It is found that trip duration, trip distance, and difference in elevation present higher feature importance in the prediction. The findings are beneficial for urban planners and operators to further improve the shared micro-mobility services toward sustainable urban mobility.
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5.
  • Ying, Z., et al. (author)
  • Antenna design for diversity and MIMO application
  • 2016
  • In: Handbook of Antenna Technologies. - Singapore : Springer. - 9789814560443 - 9789814560436 ; , s. 1479-1530
  • Book chapter (peer-reviewed)abstract
    • Recently, multiple-input multiple-output (MIMO) technology and diversity have attracted much attention both in industry and academia due to high data rate and high spectrum efficiency. By increasing the number of antennas at the transmitter and/or the receiver side of the wireless link, the diversity/MIMO techniques can increase wireless channel capacity without the need of additional power or spectrum in rich scattering environments. However, due to limited space of small mobile devices, the correlation coefficients between MIMO antenna elements are usually very high, and the total efficiencies of MIMO elements would be degraded severely due to mutual couplings. In addition, the human body causes high losses on electromagnetic waves. In real applications, the presence of users may result in significant reduction of total antenna efficiencies, and the correlations of MIMO antenna systems are also highly affected. In this chapter, the performance of some basic MIMO antennas as well as recent technologies to improve MIMO antenna performance of portable devices and mobile terminals are reviewed. The interactions between MIMO antennas and human body are also addressed particularly in mobile terminals application.
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  • Result 1-5 of 5

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