149 research outputs found
Regularized Conditional Alignment for Multi-Domain Text Classification
The most successful multi-domain text classification (MDTC) approaches employ
the shared-private paradigm to facilitate the enhancement of domain-invariant
features through domain-specific attributes. Additionally, they employ
adversarial training to align marginal feature distributions. Nevertheless,
these methodologies encounter two primary challenges: (1) Neglecting
class-aware information during adversarial alignment poses a risk of
misalignment; (2) The limited availability of labeled data across multiple
domains fails to ensure adequate discriminative capacity for the model. To
tackle these issues, we propose a method called Regularized Conditional
Alignment (RCA) to align the joint distributions of domains and classes, thus
matching features within the same category and amplifying the discriminative
qualities of acquired features. Moreover, we employ entropy minimization and
virtual adversarial training to constrain the uncertainty of predictions
pertaining to unlabeled data and enhance the model's robustness. Empirical
results on two benchmark datasets demonstrate that our RCA approach outperforms
state-of-the-art MDTC techniques.Comment: This paper has been accepted by ICASSP 202
Are All Open Source Projects Created Equal? Understanding the Sustainability of Open Source Software Development Model
A very intriguing question in Open Source software (OSS) development is: why there are only a few open source projects succeed, while the majority of projects never do. In this research, we examine the factors that may influence the performance of OSS projects. We particularly focus on the OSS’s core developers’ role in the project’s success. Extant research has yet to distinguish core developers and non-core developers from the community at large. The different roles of the core developers and non-core developers in OSS projects’ success still remain unclear. Our research contributes to the literature by separating the core developers from the development forces in general and empirically examining the core developers’ importance. Drawing the evidences from our extensive dataset of 300 open source projects, we demonstrated that core developers’ leadership and project advocation are crucial in determining the fate of the OSS projects. Our research could provide better understanding of OSS sustainability. It could also give practical advice to the OSS community on how to make the project successful
The First IEEE UV2022 Mathematical Modelling Competition: Backgrounds and Problems
Economic growth, people's health, and urban development face challenges in
the post-epidemic era. How to promote high-quality and sustainable urban
development, improve citizens' sense of happiness, and solve problems in city
management have become a heated and crucial topic. Mathematical modeling is a
research method that uses mathematical symbols to express practical problems,
establish mathematical models, and then propose solutions. The 1 IEEE
UV2022 Mathematical Modelling Competition is a satellite activity of the
6 IEEE International Conference on Universal Village, which expects
participants to use mathematical modeling methods for practical problems and
provide guidelines for sustainable social progress. This short paper introduces
the background of the competition and publishes the problems to be solved
Eddington Accretion and QSO Emission Lines at z ~ 2
Broad Absorption Line (BAL) QSOs have been suggested to be youthful
super-accretors based on their powerful radiatively driven absorbing outflows
and often reddened continua. To test this hypothesis, we observed near IR
spectra of the H region for 11 bright BAL QSOs at redshift z ~ 2. We
measured these and literature spectra for 6 BAL QSOs, 13 radio-loud and 7
radio-quiet non-BAL QSOs. Using the luminosity and H broad line width to
derive black hole mass and accretion rate, we find that both BAL and non-BAL
QSOs at z ~ 2 tend to have higher than those at low z -- probably a
result of selecting the brightest QSOs. However, we find that the high z QSOs,
in particular the BAL QSOs, have extremely strong Fe II and very weak [O III],
extending the inverse relationship found for low z QSOs. This suggests that,
even while radiating near , the BAL QSOs have a more plentiful fuel
supply than non-BAL QSOs. Comparison with low z QSOs shows for the first time
that the inverse Fe II -- [O III] relationship is indeed related to
, rather than black hole mass.Comment: 18 pages including 5 figures and 1 table. Accepted by the
Astrophysical Journal Letter
H-beta Line Width and the UV-X-ray Spectra of Luminous AGN
The width of the broad H-beta emission line is the primary defining
characteristic of the NLS1 class. This parameter is also an important component
of Boroson and Green's optical Eigenvector 1 (EV1), which links steeper soft
X-ray spectra with narrower H-beta emission, stronger H-beta blue wing,
stronger optical Fe II emission, and weaker [O III] lambda 5007. Potentially,
EV1 represents a fundamental physical process linking the dynamics of fueling
and outflow with the accretion rate. We attempted to understand these
relationships by extending the optical spectra into the UV for a sample of 22
QSOs with high quality soft-X-ray spectra, and discovered a whole new set of UV
relationships that suggest that high accretion rates are linked to dense gas
and perhaps nuclear starbursts. While it has been argued that narrow (BLR)
H-beta means low Black Hole mass in luminous NLS1s, the C IV, lambda 1549 and
Ly alpha emission lines are broader, perhaps the result of outflows driven by
their high Eddington accretion rates. We present some new trends of optical-UV
with X-ray spectral energy distributions. Steeper X-ray spectra appear
associated with stronger UV relative to optical continua, but the presence of
strong UV absorption lines is associated with depressed soft X-rays and redder
optical-UV continua.Comment: Invited talk presented at the Joint MPE,AIP,ESO workshop on NLS1s,
Bad Honnef, Dec. 1999, to appear in New Astronomy Reviews; also available at
http://wave.xray.mpe.mpg.de/conferences/nls1-worksho
- …