832 research outputs found
Cosmic constraint on the unified model of dark sectors with or without a cosmic string fluid in the varying gravitational constant theory
Observations indicate that most of the universal matter are invisible and the
gravitational constant maybe depends on the time. A theory of the
variational (VG) is explored in this paper, with naturally producing the
useful dark components in universe. We utilize the observational data: lookback
time data, model-independent gamma ray bursts, growth function of matter linear
perturbations, type Ia supernovae data with systematic errors, CMB and BAO to
restrict the unified model (UM) of dark components in VG theory. Using the
best-fit values of parameters with the covariance matrix, constraints on the
variation of are and , the small uncertainties
around constants. Limit on the equation of state of dark matter is
with assuming in unified
model, and dark energy is with assuming
at prior. Restriction on UM parameters are
and
with and
confidence level. In addition, the effect of a cosmic string fluid on unified
model in VG theory are investigated. In this case it is found that the
CDM (, and ) is included in this
VG-UM model at confidence level, and the larger errors are given:
(dimensionless energy
density of cosmic string), and .Comment: 17 pages,4 figure
Learning to Predict Charges for Criminal Cases with Legal Basis
The charge prediction task is to determine appropriate charges for a given
case, which is helpful for legal assistant systems where the user input is fact
description. We argue that relevant law articles play an important role in this
task, and therefore propose an attention-based neural network method to jointly
model the charge prediction task and the relevant article extraction task in a
unified framework. The experimental results show that, besides providing legal
basis, the relevant articles can also clearly improve the charge prediction
results, and our full model can effectively predict appropriate charges for
cases with different expression styles.Comment: 10 pages, accepted by EMNLP 201
Connecting Software Metrics across Versions to Predict Defects
Accurate software defect prediction could help software practitioners
allocate test resources to defect-prone modules effectively and efficiently. In
the last decades, much effort has been devoted to build accurate defect
prediction models, including developing quality defect predictors and modeling
techniques. However, current widely used defect predictors such as code metrics
and process metrics could not well describe how software modules change over
the project evolution, which we believe is important for defect prediction. In
order to deal with this problem, in this paper, we propose to use the
Historical Version Sequence of Metrics (HVSM) in continuous software versions
as defect predictors. Furthermore, we leverage Recurrent Neural Network (RNN),
a popular modeling technique, to take HVSM as the input to build software
prediction models. The experimental results show that, in most cases, the
proposed HVSM-based RNN model has a significantly better effort-aware ranking
effectiveness than the commonly used baseline models
- β¦