139 research outputs found
KG-MTT-BERT: Knowledge Graph Enhanced BERT for Multi-Type Medical Text Classification
Medical text learning has recently emerged as a promising area to improve
healthcare due to the wide adoption of electronic health record (EHR) systems.
The complexity of the medical text such as diverse length, mixed text types,
and full of medical jargon, poses a great challenge for developing effective
deep learning models. BERT has presented state-of-the-art results in many NLP
tasks, such as text classification and question answering. However, the
standalone BERT model cannot deal with the complexity of the medical text,
especially the lengthy clinical notes. Herein, we develop a new model called
KG-MTT-BERT (Knowledge Graph Enhanced Multi-Type Text BERT) by extending the
BERT model for long and multi-type text with the integration of the medical
knowledge graph. Our model can outperform all baselines and other
state-of-the-art models in diagnosis-related group (DRG) classification, which
requires comprehensive medical text for accurate classification. We also
demonstrated that our model can effectively handle multi-type text and the
integration of medical knowledge graph can significantly improve the
performance
Fourth order transport model on Yin-Yang grid by multi-moment constrained finite volume scheme
AbstractA fourth order transport model is proposed for global computation with the application of multi-moment constrained finite volume (MCV) scheme and Yin-Yang overset grid. Using multi-moment concept, local degrees of freedom (DOFs) are point-wisely defined within each mesh element to build a cubic spatial reconstruction. The updating formulations for local DOFs are derived by adopting multi moments as constraint conditions, including volume-integrated average (VIA), point value (PV) and first order derivative value (DV). Using Yin-Yang grid eliminates the polar singularities and results in a quasi-uniform mesh over the whole globe. Each component of Yin-Yang grid is a part of the LAT-LON grid, an orthogonal structured grid, where the MCV formulations designed for Cartesian grid can be applied straightforwardly to develop the high order numerical schemes. Proposed MCV model is checked by widely used benchmark tests. The numerical results show that the present model has fourth order accuracy and is competitive to most existing ones
Pressure induced superconductivity bordering a charge-density-wave state in NbTe4 with strong spinorbit coupling
Transition-metal chalcogenides host various phases of matter, such as
charge-density wave (CDW), superconductors, and topological insulators or
semimetals. Superconductivity and its competition with CDW in low-dimensional
compounds have attracted much interest and stimulated considerable research.
Here we report pressure induced superconductivity in a strong spin-orbit (SO)
coupled quasi-one-dimensional (1D) transition-metal chalcogenide NbTe,
which is a CDW material under ambient pressure. With increasing pressure, the
CDW transition temperature is gradually suppressed, and superconducting
transition, which is fingerprinted by a steep resistivity drop, emerges at
pressures above 12.4 GPa. Under pressure = 69 GPa, zero resistance is
detected with a transition temperature = 2.2 K and an upper critical
field = 2 T. We also find large magnetoresistance (MR) up to 102\% at
low temperatures, which is a distinct feature differentiating NbTe from
other conventional CDW materials.Comment: https://rdcu.be/LX8
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