9,912 research outputs found
Query and Output: Generating Words by Querying Distributed Word Representations for Paraphrase Generation
Most recent approaches use the sequence-to-sequence model for paraphrase
generation. The existing sequence-to-sequence model tends to memorize the words
and the patterns in the training dataset instead of learning the meaning of the
words. Therefore, the generated sentences are often grammatically correct but
semantically improper. In this work, we introduce a novel model based on the
encoder-decoder framework, called Word Embedding Attention Network (WEAN). Our
proposed model generates the words by querying distributed word representations
(i.e. neural word embeddings), hoping to capturing the meaning of the according
words. Following previous work, we evaluate our model on two
paraphrase-oriented tasks, namely text simplification and short text
abstractive summarization. Experimental results show that our model outperforms
the sequence-to-sequence baseline by the BLEU score of 6.3 and 5.5 on two
English text simplification datasets, and the ROUGE-2 F1 score of 5.7 on a
Chinese summarization dataset. Moreover, our model achieves state-of-the-art
performances on these three benchmark datasets.Comment: arXiv admin note: text overlap with arXiv:1710.0231
SWIFT J1749.4-2807: A neutron or quark star?
We investigate an unique accreting millisecond pulsar with X-ray eclipses,
SWIFT J1749.42807 (hereafter J1749), and try to limit the binary system by
various methods including that of the Roche lobe, the mass-radius relations of
both a main sequence (MS) and a white dwarf (WD) companion stars, as well as
the measured mass function of the pulsar. The calculations are based on the
assumption that the radius of the companion star has reached its Roche radius
(or at 90%), but the pulsar's mass has not been assumed to be a certain value.
Our results are as follows. The companion star should be a MS. For the case
that the radius equals to its Roche one, we have a companion star with mass
and radius , and the
inclination angle is ; for the case that the radius
reaches 90% of its Roche one, we have , and . We also obtain the mass of J1749,
, and conclude that the pulsar could be a quark star
if the ratio of the critical frequency of rotation-mode instability to the
Keplerian one is higher than . The relatively low pulsar mass (about
) may also challenge the conventional recycling scenario for the
origin and evolution of millisecond pulsars. The results presented in this
paper are expected to be tested by future observations.Comment: RAA accepte
Joint Transmit Power and Placement Optimization for URLLC-enabled UAV Relay Systems
This letter considers an unmanned aerial vehicle (UAV)-enabled relay communication system for delivering latency-critical messages with ultra-high reliability, where the relay is operating under amplifier-and-forward (AF) mode. We aim to jointly optimize the UAV location and power to minimize decoding error probability while guaranteeing the latency constraints. Both the free-space channel model and three-dimensional (3-D) channel model are considered. For the first model, we propose a low-complexity iterative algorithm to solve the problem, while globally optimal solution is derived for the case when the signal-to-noise ratio (SNR) is extremely high. For the second model, we also propose a low-complexity iterative algorithm to solve the problem. Simulation results confirm the performance advantages of our proposed algorithms
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