1,938 research outputs found
Extremely long-lived universal resonant Bose gases
Quantum simulations based on near-resonance Bose gases are limited by their
short lifetimes due to severe atom losses. In addition to this, the recently
predicted thermodynamical instability adds another constraint on accessing the
resonant Bose gases. In this Letter, we offer a potential solution by proposing
long-lived resonant Bose gases in both two and three dimensions, where the
conventional few-body losses are strongly suppressed. We show that the
thermodynamical properties as well as the lifetimes of these strongly
interacting systems are universal, and independent of short-range physics.Comment: 5 page
Repulsion Loss: Detecting Pedestrians in a Crowd
Detecting individual pedestrians in a crowd remains a challenging problem
since the pedestrians often gather together and occlude each other in
real-world scenarios. In this paper, we first explore how a state-of-the-art
pedestrian detector is harmed by crowd occlusion via experimentation, providing
insights into the crowd occlusion problem. Then, we propose a novel bounding
box regression loss specifically designed for crowd scenes, termed repulsion
loss. This loss is driven by two motivations: the attraction by target, and the
repulsion by other surrounding objects. The repulsion term prevents the
proposal from shifting to surrounding objects thus leading to more crowd-robust
localization. Our detector trained by repulsion loss outperforms all the
state-of-the-art methods with a significant improvement in occlusion cases.Comment: Accepted to IEEE Conference on Computer Vision and Pattern
Recognition (CVPR) 201
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