166 research outputs found
CoupleNet: Coupling Global Structure with Local Parts for Object Detection
The region-based Convolutional Neural Network (CNN) detectors such as Faster
R-CNN or R-FCN have already shown promising results for object detection by
combining the region proposal subnetwork and the classification subnetwork
together. Although R-FCN has achieved higher detection speed while keeping the
detection performance, the global structure information is ignored by the
position-sensitive score maps. To fully explore the local and global
properties, in this paper, we propose a novel fully convolutional network,
named as CoupleNet, to couple the global structure with local parts for object
detection. Specifically, the object proposals obtained by the Region Proposal
Network (RPN) are fed into the the coupling module which consists of two
branches. One branch adopts the position-sensitive RoI (PSRoI) pooling to
capture the local part information of the object, while the other employs the
RoI pooling to encode the global and context information. Next, we design
different coupling strategies and normalization ways to make full use of the
complementary advantages between the global and local branches. Extensive
experiments demonstrate the effectiveness of our approach. We achieve
state-of-the-art results on all three challenging datasets, i.e. a mAP of 82.7%
on VOC07, 80.4% on VOC12, and 34.4% on COCO. Codes will be made publicly
available.Comment: Accepted by ICCV 201
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Channel prior convolutional attention for medical image segmentation
Characteristics such as low contrast and significant organ shape variations
are often exhibited in medical images. The improvement of segmentation
performance in medical imaging is limited by the generally insufficient
adaptive capabilities of existing attention mechanisms. An efficient Channel
Prior Convolutional Attention (CPCA) method is proposed in this paper,
supporting the dynamic distribution of attention weights in both channel and
spatial dimensions. Spatial relationships are effectively extracted while
preserving the channel prior by employing a multi-scale depth-wise
convolutional module. The ability to focus on informative channels and
important regions is possessed by CPCA. A segmentation network called CPCANet
for medical image segmentation is proposed based on CPCA. CPCANet is validated
on two publicly available datasets. Improved segmentation performance is
achieved by CPCANet while requiring fewer computational resources through
comparisons with state-of-the-art algorithms. Our code is publicly available at
\url{https://github.com/Cuthbert-Huang/CPCANet}
Tracking Control Based on Control Allocation with an Innovative Control Effector Aircraft Application
This paper proposes a control allocation method for the tracking control problem of a class of morphing aircraft with special actuators which are different from the conventional actuation surfaces. This design of actuators can bring about some potential advantages to the flight vehicles; however, due to the integral constraints, the desired control cannot be performed accurately; therefore, it leads to undesirable tracking errors, so influencing the performance of the system. Because the system could be control allocated, based on the designed cost function that describes the tracking errors, the cuckoo search algorithm (CSA) is introduced to search for the optimum solution within the calculated actuator execution commands that are equivalent to the desired commands. Several improvement measures are proposed for boosting the efficiency of the CSA and ensuring reasonable solutions. Simulation results show that the proposed control allocation method is necessary and effective, and the improvement measures are helpful in obtaining the optimum solution
Sample-efficient benchmarking of multi-photon interference on a boson sampler in the sparse regime
Verification of a quantum advantage in the presence of noise is a key open
problem in the study of near-term quantum devices. In this work, we show how to
assess the quality of photonic interference in a linear optical quantum device
(boson sampler) by using a maximum likelihood method to measure the strength at
which various noise sources are present in the experiment. This allows us to
use a sparse set of samples to test whether a given boson sampling experiment
meets known upper bounds on the level of noise permissible to demonstrate a
quantum advantage. Furthermore, this method allows us monitor the evolution of
noise in real time, creating a valuable diagnostic tool. Finally, we observe
that sources of noise in the experiment compound, meaning that the observed
value of the mutual photon indistinguishability, which is the main imperfection
in our study, is an effective value taking into account all sources of error in
the experiment
Enhanced Interfacial Electronic Transfer of BiVO4 Coupled with 2D gâC3N4 for Visibleâlight Photocatalytic Performance
A BiVO4/2D gâC3N4 direct dual semiconductor photocatalytic system has been fabricated via electrostatic selfâassembly method of BiVO4 microparticle and gâC3N4 nanosheet. According to experimental measurements and firstâprinciple calculations, the formation of builtâin electric field and the opposite band bending around the interface region in BiVO4/2D gâC3N4 as well as the intimate contact between BiVO4 and 2D gâC3N4 will lead to high separation efficiency of charge carriers. More importantly, the intensity of bulidâin electric field is greatly enhanced due to the ultrathin nanosheet structure of 2D gâC3N4. As a result, BiVO4/2D gâC3N4 exhibits excellent photocatalytic performance with the 93.0% Rhodamine B (RhB) removal after 40 min visible light irradiation, and the photocatalytic reaction rate is about 22.7 and 10.3 times as high as that of BiVO4 and 2D gâC3N4, respectively. In addition, BiVO4/2D gâC3N4 also displays enhanced photocatalytic performance in the degradation of tetracycline (TC). It is expected that this work may provide insights into the understanding the significant role of builtâin electric field in heterostructure and fabricating highly efficient direct dual semiconductor systems
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