425 research outputs found
Minimality of p-adic rational maps with good reduction
A rational map with good reduction in the field of -adic
numbers defines a -Lipschitz dynamical system on the projective line
over . The dynamical structure of
such a system is completely described by a minimal decomposition. That is to
say, is decomposed into three parts: finitely
many periodic orbits; finite or countably many minimal subsystems each
consisting of a finite union of balls; and the attracting basins of periodic
orbits and minimal subsystems. For any prime , a criterion of minimality for
rational maps with good reduction is obtained. When , a condition in terms
of the coefficients of the rational map is proved to be necessary for the map
being minimal and having good reduction, and sufficient for the map being
minimal and -Lipschitz. It is also proved that a rational map having good
reduction of degree , and can never be minimal on the whole space
.Comment: 21 page
Localizing by Describing: Attribute-Guided Attention Localization for Fine-Grained Recognition
A key challenge in fine-grained recognition is how to find and represent
discriminative local regions. Recent attention models are capable of learning
discriminative region localizers only from category labels with reinforcement
learning. However, not utilizing any explicit part information, they are not
able to accurately find multiple distinctive regions. In this work, we
introduce an attribute-guided attention localization scheme where the local
region localizers are learned under the guidance of part attribute
descriptions. By designing a novel reward strategy, we are able to learn to
locate regions that are spatially and semantically distinctive with
reinforcement learning algorithm. The attribute labeling requirement of the
scheme is more amenable than the accurate part location annotation required by
traditional part-based fine-grained recognition methods. Experimental results
on the CUB-200-2011 dataset demonstrate the superiority of the proposed scheme
on both fine-grained recognition and attribute recognition
Study on the Distribution Pattern of PAHs in the Coking Dust from the Coking Environment
AbstractThis paper conducts a study and analyzes five kinds of dust samples of different environment, including an office area,a ground station of the new plant, the first workshop of coking, a top of coke oven and a ground station of the old plant in coking plant and obtaines the distribution pattern of PAHs in the coking dust by the way of ultrasonic extraction and high performance liquid chromatography. The data show that PAHs from the first workshop turns out to be the richest with its content getting up to 12.00μgám-3. By analyzing the single component distribution of PAHs, the results show that there are fourteen kinds of PAHs produced at 5 sites. Through analyzing the particle size of coking dust, its size is mainly below 10μm and its contents exceeds to 75%. The first workshop environment is the highest and reaching 98.39%
MeMaHand: Exploiting Mesh-Mano Interaction for Single Image Two-Hand Reconstruction
Existing methods proposed for hand reconstruction tasks usually parameterize
a generic 3D hand model or predict hand mesh positions directly. The parametric
representations consisting of hand shapes and rotational poses are more stable,
while the non-parametric methods can predict more accurate mesh positions. In
this paper, we propose to reconstruct meshes and estimate MANO parameters of
two hands from a single RGB image simultaneously to utilize the merits of two
kinds of hand representations. To fulfill this target, we propose novel
Mesh-Mano interaction blocks (MMIBs), which take mesh vertices positions and
MANO parameters as two kinds of query tokens. MMIB consists of one graph
residual block to aggregate local information and two transformer encoders to
model long-range dependencies. The transformer encoders are equipped with
different asymmetric attention masks to model the intra-hand and inter-hand
attention, respectively. Moreover, we introduce the mesh alignment refinement
module to further enhance the mesh-image alignment. Extensive experiments on
the InterHand2.6M benchmark demonstrate promising results over the
state-of-the-art hand reconstruction methods
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