764 research outputs found
Color Superconductivity at Moderate Density
The effect of color breaking on colored quarks' chiral condensates has been
investigated at zero temperature and moderate baryon density. It is found that
the influence of the diquark condensate on different colored quarks is very
small.Comment: 4 pages, 1 figure in eps, talk given at XXXI International Symposium
on Multiparticle Dynamics, Sept 1-7, 2001, Datong China. See
http://ismd31.ccnu.edu.cn
Experience with Group Supervision
Supervision can take a few different forms. For example, it can be one-to-one supervision and it can also be group supervision. Group supervision is an important process within the scientific community. Many research groups use this form to supervise doctoral- and master students in groups. Some efforts have been made to study this process. For example, Samara (2002) studied the group supervision process in group writing. However, group supervision has not been studied thoroughly so far. This project aims at studying the group supervision from the community of practice point of view. The main research question is: What are the effects of group supervision on constructing a learning community
Research Progress and the Limiting Factors of Direct Seeding Rice in Central China
Symposium paper Part 2: Frontiers of sustainable rice production syste
Learning Segmentation Masks with the Independence Prior
An instance with a bad mask might make a composite image that uses it look
fake. This encourages us to learn segmentation by generating realistic
composite images. To achieve this, we propose a novel framework that exploits a
new proposed prior called the independence prior based on Generative
Adversarial Networks (GANs). The generator produces an image with multiple
category-specific instance providers, a layout module and a composition module.
Firstly, each provider independently outputs a category-specific instance image
with a soft mask. Then the provided instances' poses are corrected by the
layout module. Lastly, the composition module combines these instances into a
final image. Training with adversarial loss and penalty for mask area, each
provider learns a mask that is as small as possible but enough to cover a
complete category-specific instance. Weakly supervised semantic segmentation
methods widely use grouping cues modeling the association between image parts,
which are either artificially designed or learned with costly segmentation
labels or only modeled on local pairs. Unlike them, our method automatically
models the dependence between any parts and learns instance segmentation. We
apply our framework in two cases: (1) Foreground segmentation on
category-specific images with box-level annotation. (2) Unsupervised learning
of instance appearances and masks with only one image of homogeneous object
cluster (HOC). We get appealing results in both tasks, which shows the
independence prior is useful for instance segmentation and it is possible to
unsupervisedly learn instance masks with only one image.Comment: 7+5 pages, 13 figures, Accepted to AAAI 201
Experimental Study of Influence of Movements on Airflow Under Stratum Ventilation
AbstractStratum ventilation, which could provide quality air in breathing zone and stratified thermal comfort, is a promising technology to meet the challenge of energy saving nowadays. This study is to find the influence of movements on airflow under stratum ventilation.The experiment is conducted in a full-scale chamber. A moving manikin is used to simulate the movements of an occupant. The results show that the moving manikin blocks some of the supply air when it is passing by the supply air inlet. However, the influence is local and disappears fast, mostly within 20 s
Policy Gradients for Probabilistic Constrained Reinforcement Learning
This paper considers the problem of learning safe policies in the context of
reinforcement learning (RL). In particular, we consider the notion of
probabilistic safety. This is, we aim to design policies that maintain the
state of the system in a safe set with high probability. This notion differs
from cumulative constraints often considered in the literature. The challenge
of working with probabilistic safety is the lack of expressions for their
gradients. Indeed, policy optimization algorithms rely on gradients of the
objective function and the constraints. To the best of our knowledge, this work
is the first one providing such explicit gradient expressions for probabilistic
constraints. It is worth noting that the gradient of this family of constraints
can be applied to various policy-based algorithms. We demonstrate empirically
that it is possible to handle probabilistic constraints in a continuous
navigation problem
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