7,423 research outputs found
A Submillimeter Burst of S255IR~SMA1 - The Rise And Fall Of Its Luminosity
Temporal photometric variations at near infrared to submillimeter wavelengths
have been found in low-mass young stellar objects. These phenomena are
generally interpreted as accretion events of star-disk systems with varying
accretion rates. There is growing evidence suggesting that similar luminosity
flaring also occurs in high-mass star/cluster-forming regions. We report in
this Letter the rise and fall of the 900 m continuum emission and the
newly found 349.1 GHz methanol maser emission in the massive star forming
region S255IR~SMA1 observed with the Submillimeter Array and the Atacama Large
Millimeter/submillimeter Array. The level of flux variation at a factor of
2 at the submillimeter band and the relatively short 2-year duration of
this burst suggest that the event is probably similar to those milder and more
frequent minor bursts seen in 3D numerical simulations.Comment: 8 pages, 4 figures, Accepted for publication in The Astrophysical
Journal Lette
Transition Complexity of Incomplete DFAs
In this paper, we consider the transition complexity of regular languages
based on the incomplete deterministic finite automata. A number of results on
Boolean operations have been obtained. It is shown that the transition
complexity results for union and complementation are very different from the
state complexity results for the same operations. However, for intersection,
the transition complexity result is similar to that of state complexity.Comment: In Proceedings DCFS 2010, arXiv:1008.127
State Complexity of Catenation Combined with Star and Reversal
This paper is a continuation of our research work on state complexity of
combined operations. Motivated by applications, we study the state complexities
of two particular combined operations: catenation combined with star and
catenation combined with reversal. We show that the state complexities of both
of these combined operations are considerably less than the compositions of the
state complexities of their individual participating operations.Comment: In Proceedings DCFS 2010, arXiv:1008.127
EHRDiff: Exploring Realistic EHR Synthesis with Diffusion Models
Electronic health records (EHR) contain vast biomedical knowledge and are
rich resources for developing precise medicine systems. However, due to privacy
concerns, there are limited high-quality EHR data accessible to researchers
hence hindering the advancement of methodologies. Recent research has explored
using generative modelling methods to synthesize realistic EHR data, and most
proposed methods are based on the generative adversarial network (GAN) and its
variants for EHR synthesis. Although GAN-style methods achieved
state-of-the-art performance in generating high-quality EHR data, such methods
are hard to train and prone to mode collapse. Diffusion models are recently
proposed generative modelling methods and set cutting-edge performance in image
generation. The performance of diffusion models in realistic EHR synthesis is
rarely explored. In this work, we explore whether the superior performance of
diffusion models can translate to the domain of EHR synthesis and propose a
novel EHR synthesis method named EHRDiff. Through comprehensive experiments,
EHRDiff achieves new state-of-the-art performance for the quality of synthetic
EHR data and can better protect private information in real training EHRs in
the meanwhile.Comment: Working in progres
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