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Yunfeng Li

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IJCAI Conference 2023 Conference Paper

Temporal Knowledge Graph Completion: A Survey

  • Borui Cai
  • Yong Xiang
  • Longxiang Gao
  • He Zhang
  • Yunfeng Li
  • Jianxin Li

Knowledge graph completion (KGC) predicts missing links and is crucial for real-life knowledge graphs, which widely suffer from incompleteness. KGC methods assume a knowledge graph is static, but that may lead to inaccurate prediction results because many facts in the knowledge graphs change over time. Emerging methods have recently shown improved prediction results by further incorporating the temporal validity of facts; namely, temporal knowledge graph completion (TKGC). With this temporal information, TKGC methods explicitly learn the dynamic evolution of the knowledge graph that KGC methods fail to capture. In this paper, for the first time, we comprehensively summarize the recent advances in TKGC research. First, we detail the background of TKGC, including the preliminary knowledge, benchmark datasets, and evaluation metrics. Then, we summarize existing TKGC methods based on how the temporal validity of facts is used to capture the temporal dynamics. Finally, we conclude the paper and present future research directions of TKGC.

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ICRA Conference 2000 Conference Paper

Track-Following Controller Design of MEMS Based Dual-Stage Servos in Magnetic Hard Disk Drives

  • Yunfeng Li
  • Roberto Horowitz

A decoupled controller architecture and discrete time pole placement design methodology is proposed for dual-stage servo controller design of magnetic hard disk drives. The methodology was applied to the controller design of a dual-stage servo with a MEMS microactuator (MA) which rotates the slider relative to the gimbal. MIMO and SIMO controllers were designed for cases when the microactuator's relative position error signal is respectively available and not available to the control system. The effects of MA resonance variations on the stability and performance of the controller were analyzed for both cases.

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v2026.09.13