196 research outputs found
Study on the Wald-W Method of Uncertain Decision-making
AbstractUncertain decision-making is one of important research areas in the decision-making theory. For a long time five decision standards such as optimism decision standard, pessimism decision standard, compromised decision standard, equality decision standard and regret decision standard have been regarded as a model in all the available literatures. This article put forwards a new type of uncertainty decision-making method, and makes a more systematic study of Wald-W method through the way of solving matrix game
CBNet: A Novel Composite Backbone Network Architecture for Object Detection
In existing CNN based detectors, the backbone network is a very important
component for basic feature extraction, and the performance of the detectors
highly depends on it. In this paper, we aim to achieve better detection
performance by building a more powerful backbone from existing backbones like
ResNet and ResNeXt. Specifically, we propose a novel strategy for assembling
multiple identical backbones by composite connections between the adjacent
backbones, to form a more powerful backbone named Composite Backbone Network
(CBNet). In this way, CBNet iteratively feeds the output features of the
previous backbone, namely high-level features, as part of input features to the
succeeding backbone, in a stage-by-stage fashion, and finally the feature maps
of the last backbone (named Lead Backbone) are used for object detection. We
show that CBNet can be very easily integrated into most state-of-the-art
detectors and significantly improve their performances. For example, it boosts
the mAP of FPN, Mask R-CNN and Cascade R-CNN on the COCO dataset by about 1.5
to 3.0 percent. Meanwhile, experimental results show that the instance
segmentation results can also be improved. Specially, by simply integrating the
proposed CBNet into the baseline detector Cascade Mask R-CNN, we achieve a new
state-of-the-art result on COCO dataset (mAP of 53.3) with single model, which
demonstrates great effectiveness of the proposed CBNet architecture. Code will
be made available on https://github.com/PKUbahuangliuhe/CBNet.Comment: 7 pages,6 figure
Electrically pumped semiconductor laser with low spatial coherence and directional emission
We design and fabricate an on-chip laser source that produces a directional
beam with low spatial coherence. The lasing modes are based on the axial orbit
in a stable cavity and have good directionality. To reduce the spatial
coherence of emission, the number of transverse lasing modes is maximized by
fine-tuning the cavity geometry. Decoherence is reached in a few nanoseconds.
Such rapid decoherence will facilitate applications in ultrafast speckle-free
full-field imaging
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Deformation induced structural evolution in bulk metallic glasses
The structural behavior of binary Cu50Zr50 and ternary Cu50Zr45Ti5 bulk metallic glasses (BMGs) under applied stress was investigated by means of in-situ high energy X-ray synchrotron diffraction. The components of the strain tensors were determined from the shifts of the maxima of the atomic pair correlation functions (PDF) in real space. The anisotropic atomic reorientation in the first-nearest-neighbor shell versus stress suggests structural rearrangements in short-range order. Within the plastic deformation range the overall strain of the metallic glass is equal to the yield strain. After unloading, the atomic structure returns to the stress-free state, and the short-range order is identical to that of the undeformed state. Plastic deformation, however, leads to localized shear bands whose contribution to the volume averaged diffraction pattern is too weak to be detected. A concordant region evidenced by the anisotropic component is activated to counterbalance the stress change due to the atomic bond reorientation in the first-nearest-neighbor shell. The size of the concordant region is an important factor dominating the yield strength and the plastic strain ability of the BMGs
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